Battery device, electric device, energy storage device, and battery cell

Abstract

Disclosed in embodiments of the present disclosure are a battery device, an electric device, an energy storage device, and a battery cell. The battery device comprises at least two battery cells. Each battery cell comprises: a casing, comprising a casing body and a first casing wall connected to the casing body, wherein the first casing wall is located at an end portion of at least one side of the casing body in the direction of gravity, and the wall thickness of the first casing wall is greater than the wall thickness of the casing wall of the casing body; and in the direction of gravity, the at least two battery cells are stacked, and the first casing wall abuts against the adjacent battery cell.

Description

Battery devices, electrical devices, energy storage devices and individual battery cells

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202520006061.2, filed on January 2, 2025, entitled “Battery Device, Power Consumption Device, Energy Storage Device and Battery Cell”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and in particular to battery devices, power consumption devices, energy storage devices, and battery cells. Background Technology

[0004] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are being used more and more in the field of energy storage.

[0005] To improve the energy efficiency of battery devices, these devices typically consist of multiple battery cells arranged in an array. The arrangement of these cells affects the volumetric efficiency of the battery device. Furthermore, the industry is continuously demanding higher levels of volumetric efficiency and energy density from battery devices. Therefore, further optimizing the arrangement of battery cells to improve the volumetric efficiency of the battery device is one of the research and development topics. Summary of the Invention

[0006] To address the aforementioned technical problems, this disclosure provides a battery device, power consumption device, energy storage device, and battery cell that can improve volume utilization.

[0007] In a first aspect, embodiments of this disclosure provide a battery device, the battery device including at least two battery cells, each battery cell including: a shell, including a shell body and a first shell wall connected to the shell body, the first shell wall being located at at least one end of the shell body along the direction of gravity, the wall thickness of the first shell wall being greater than the wall thickness of the shell body's shell wall; at least two battery cells are stacked along the direction of gravity, and the first shell wall abuts against adjacent battery cells.

[0008] This allows for the arrangement of multiple battery cells along the direction of gravity. Even with limited horizontal space for battery installation, this arrangement maximizes space utilization and increases the energy output of the battery device. Furthermore, the increased thickness of the first housing wall compared to the main housing wall enhances its strength and rigidity. This provides stable support between the stacked battery cells, facilitating the stacking of multiple cells along the direction of gravity and further improving the volume utilization of the battery device.

[0009] In some embodiments, the first housing wall is formed with a protrusion that abuts against an adjacent battery cell along the direction of gravity; each battery cell also includes an electrode terminal disposed on the first housing wall and located in the first housing wall at a position where no protrusion is formed.

[0010] Because the first housing wall has protrusions, its strength and rigidity are improved, thereby enhancing the support stability for adjacent battery cells and facilitating the stacking of multiple battery cells along the direction of gravity. Furthermore, since the electrode terminals are located on the first housing wall at positions where no protrusions are formed, the stacked battery cells occupy as little space as possible in the direction of gravity, further maximizing the use of space in the direction of gravity for arranging multiple layers of battery cells, thus improving space utilization and the energy of the battery device.

[0011] In some embodiments, the wall thickness 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.

[0012] Because the shell wall of the main shell is of a suitable thickness, it is possible to balance the rigidity and volume utilization of the shell; because the first shell wall is of a suitable thickness, it is possible to balance the rigidity and strength of the first shell wall, enabling multi-layer stacking along the direction of gravity and improving volume utilization.

[0013] In some embodiments, the wall thickness of the first housing wall is in the range of 1.5 mm to 2.5 mm.

[0014] Because the first shell wall is of a suitable thickness, the rigidity and strength of the first shell wall can be further balanced, enabling multi-layer stacking along the direction of gravity and improving volume utilization.

[0015] In some embodiments, multiple battery cells form multiple battery cell groups, each battery cell group comprising n battery cells stacked along the direction of gravity, where n is a natural number greater than or equal to 2 and less than or equal to 10.

[0016] This allows for the stacking of an appropriate number of battery cells based on the height of the internal space of the battery device along the direction of gravity, thereby improving volume utilization.

[0017] In some embodiments, n is 2, and the wall thickness of the first housing wall is in the range of 0.8 mm to 1.0 mm.

[0018] Since two battery cells are stacked along the direction of gravity, and the thickness of the first housing wall is in the range of 0.8mm to 1.0mm, 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.

[0019] In some embodiments, n is 2 or 3, and the wall thickness of the first housing wall is in the range of 1.0 mm to 2.0 mm.

[0020] Since two or three battery cells are stacked along the direction of gravity, and the thickness of the first housing wall is in the range of 1.0 mm to 2.0 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.

[0021] In some embodiments, n is 2, 3, or 4, and the wall thickness of the first housing wall is in the range of 1.5 mm to 2.5 mm.

[0022] Since 2, 3, or 4 battery cells are stacked along the direction of gravity, and the thickness of the first housing wall is in the range of 1.5mm to 2.5mm, 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 rate of the battery device.

[0023] 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 housing wall is in the range of 1.5 mm to 3.0 mm.

[0024] 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.

[0025] In some embodiments, the battery cell further includes an electrode assembly, the housing has a receiving space, the electrode assembly is housed in the receiving space, and the housing body includes two second housing walls disposed opposite each other along a first direction, the first direction being perpendicular to the direction of gravity and consistent with the length direction of the battery cell, and along the first direction, the ratio of the length of the electrode assembly to the distance between the opposing walls of the two second housing walls is greater than 90% and less than 100%.

[0026] Therefore, not only can the battery cells and even the battery device have a high volume utilization rate, but the electrode assembly can also provide a certain support force, reducing the degree of bending deformation of the second housing wall along the first direction.

[0027] In some embodiments, the shell body further includes two third shell walls disposed opposite each other along a second direction, the second direction being perpendicular to the direction of gravity and the first direction, and along the second direction, the ratio of the width of the electrode assembly to the distance between the opposing walls of the two third shell walls is greater than 90% and less than 100%.

[0028] Therefore, not only can the battery cells and even the battery device have a high volume utilization rate, but the electrode assembly can also provide a certain support force, reducing the degree of bending deformation of the third housing wall in the second direction within a range of almost the entire length along the first direction.

[0029] In some embodiments, the battery cell further includes an electrode assembly, the housing has a receiving space, the electrode assembly is housed in the receiving space, a first housing wall is located at one end of the housing body along the direction of gravity, the housing body includes a fourth housing wall disposed opposite to the first housing wall along the direction of gravity, and along the direction of gravity, the ratio of the height of the electrode assembly to the distance between the protrusion in the first housing wall and the opposite wall surface of the fourth housing wall is greater than 80% and less than 100%.

[0030] Therefore, not only can the battery cell and even the battery device have a high volume utilization rate, but the electrode assembly can also provide a certain support force, reducing the degree of bending deformation of the first shell wall along the direction of gravity within a range close to the entire length of the first direction, and reducing the degree of bending deformation of the second shell wall along the first direction within a range close to the overall height of the first direction.

[0031] In some embodiments, the length of the first housing wall along the first direction is in the 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 cell.

[0032] Therefore, the embodiments of this disclosure 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.

[0033] In some embodiments, the length of the first housing wall along the first direction is in the range of 120 mm to 600 mm.

[0034] Therefore, the embodiments of this disclosure 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.

[0035] In some embodiments, the length of the first housing wall along the first direction is in the range of 150 mm to 400 mm.

[0036] Therefore, the embodiments of this disclosure 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.

[0037] In some embodiments, the first housing wall is formed with a protrusion that abuts against an adjacent battery cell along the direction of gravity; the ratio of the length of the protrusion along the first direction to the length of the first housing wall along the first direction is more than 50% and less than 98%.

[0038] Therefore, by designing the protrusion to be more than half the length of the first shell wall along the first direction, a sufficiently large contact surface is provided to support it, which is beneficial to improve the stacking stability along the direction of gravity.

[0039] In some embodiments, the width of the first housing wall along the second direction is in the range of 12 mm to 90 mm, wherein the first direction, the second direction and the gravity direction are perpendicular to each other.

[0040] Therefore, the embodiments of this disclosure can be applied to battery cells of various widths according to actual conditions, thereby producing battery devices that match the installation space of the battery device and have high volume utilization and high energy.

[0041] In some embodiments, the width of the first housing wall along the second direction is in the range of 25 mm to 45 mm.

[0042] Therefore, the embodiments of this disclosure can be applied to battery cells of various widths according to actual conditions, thereby producing battery devices that match the installation space of the battery device and have high volume utilization and high energy.

[0043] In some embodiments, the maximum height of a single battery cell along the direction of gravity is in the range of 80 mm to 250 mm.

[0044] Therefore, the embodiments of this disclosure can be applied to various battery cells of different heights 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.

[0045] In some embodiments, the maximum height of a single battery cell along the direction of gravity is in the range of 100 mm to 200 mm.

[0046] Therefore, the embodiments of this disclosure can be applied to various battery cells of different heights 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.

[0047] In some embodiments, the housing body includes two second housing walls disposed opposite each other along a 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 disposed on at least one of the second housing walls.

[0048] Since the pressure relief component is located on the second housing wall rather than the first housing wall where the electrode terminals are located, there is no need to leave a channel for venting the pressure relief gas in the direction of gravity. This helps to reduce the space occupied by multiple battery cells stacked in the direction of gravity and improve volume utilization. Moreover, it can reduce the probability of the ejected material falling on the electrode terminals when the pressure relief component is depressurized, realize the separation of electricity and gas, and reduce the risk of short circuit or even fire caused by thermal runaway of battery cells.

[0049] In some embodiments, the shell body further includes two third shell walls disposed opposite each other along a second direction, wherein the area of ​​the first shell wall and the area of ​​the second shell wall are smaller than the area of ​​the third shell walls.

[0050] Therefore, since the pressure relief component is not formed on the larger third housing wall, the space occupied by the channel for venting the pressure relief gas can be reduced, further improving the space utilization rate within the battery device.

[0051] In some embodiments, multiple battery cells form multiple battery cell groups, each battery cell group including multiple battery cells stacked along the direction of gravity, the multiple battery cell groups including a first battery cell group and a second battery cell group, the first battery cell group and the second battery cell group are arranged along a first direction with a gap between them, and at least some battery cells in the first battery cell group and / or at least some battery cells in the second battery cell group are arranged with their respective pressure relief components facing the gap.

[0052] Since multiple battery cells form multiple battery cell groups, and each battery cell group includes multiple battery cells stacked along the direction of gravity, the battery device can include more battery cells and provide higher energy. Since at least some battery cells in the first battery cell group and / or at least some battery cells in the second battery cell group are arranged with their respective pressure relief components facing the interval, the first battery cell group and the second battery cell group can share the interval, which is beneficial to improving the space utilization within the battery device. Moreover, the fact that the pressure relief components of some battery cells can face the interval also allows for flexible design of the arrangement orientation of the battery cells.

[0053] In some embodiments, the first battery cell group and the second battery cell group are arranged such that the pressure relief components of each battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group are spaced apart.

[0054] Therefore, the first battery cell group and the second battery cell group share a space, which helps to improve the space utilization rate within the battery device.

[0055] In some embodiments, the pressure relief components of each battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group are offset along the direction of gravity, and in the same projection plane perpendicular to the first direction, the projections of the pressure relief components of each battery cell in the first battery cell group and the projections of the pressure relief components of each battery cell in the second battery cell group do not overlap.

[0056] Therefore, since the pressure relief components of the battery cells are completely offset along the direction of gravity, the probability of the ejected material contaminating or damaging the pressure relief components of the opposite battery cell when the pressure relief components are depressurized can be reduced, thereby reducing the risk of thermal diffusion along the first direction when the battery cell experiences thermal runaway.

[0057] In some embodiments, the plurality of battery cell groups further includes a third battery cell group, wherein the pressure relief components of each battery cell in the third battery cell group are oriented in the same direction along the first direction as the pressure relief components of each battery cell in the first battery cell group are oriented in the same direction along the first direction, and a second battery cell group is located between the first battery cell group and the third battery cell group along the first direction.

[0058] This allows for the flexible arrangement of more battery cells, resulting in high packing efficiency. Furthermore, the third battery cell group is located on the side of the second battery cell group facing away from the first battery cell group along the first direction, and the pressure relief component is located on the side of the third battery cell group facing away from the second battery cell group. Therefore, the second and third battery cell groups can be arranged close to or even in contact with each other along the first direction, thereby further improving space utilization and the energy of the battery device.

[0059] In some embodiments, multiple battery cells form multiple battery cell groups, each battery cell group including multiple battery cells stacked along the direction of gravity, the multiple battery cell groups including a second battery cell group and a third battery cell group, the second battery cell group and the third battery cell group being arranged along a first direction, and the pressure relief component of each battery cell in the third battery cell group being oriented along the first direction away from the direction of the second battery cell group, and the pressure relief component of each battery cell in the second battery cell group being oriented along the first direction away from the direction of the third battery cell group.

[0060] This allows the pressure relief components of the two battery cells to be further apart, significantly reducing the risk of thermal runaway along the first direction. In addition, the channels for discharging the gas ejected from the pressure relief components can be arranged on both sides of the two battery cells, which is beneficial for utilizing the space on both sides.

[0061] In some embodiments, a first housing wall is located at one end of the housing body along the direction of gravity. The housing body includes a fourth housing wall disposed opposite to the first housing wall along the direction of gravity. Multiple battery cells form multiple battery cell groups. Each battery cell group includes multiple battery cells stacked along the direction of gravity. In the same battery cell group, the first housing wall of the lower battery cell along the direction of gravity abuts against the fourth housing wall of the upper battery cell. Alternatively, in the same battery cell group, the first housing wall of the upper battery cell along the direction of gravity abuts against the fourth housing wall of the lower battery cell.

[0062] Therefore, battery cells can be stacked with the first housing wall (electrode terminals) facing upwards, or with the first housing wall (electrode terminals) facing downwards, or a combination of both stacking directions can be arranged. This not only improves the flexibility of battery cell orientation arrangement, but also allows the pressure relief components to be easily staggered by changing the orientation of the battery cells. This eliminates the need to prepare two types of battery cells with different pressure relief component positions, which helps to simplify the battery cell manufacturing process, improve production efficiency, and reduce production costs.

[0063] In some embodiments, the plurality of battery cell groups include 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 a second direction, and each first battery cell group and each second battery cell group are arranged opposite each other along the first direction with a gap between them. The gap is connected along the second direction to form a first channel. The pressure relief components of each battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group are both oriented towards the first channel along the first direction and are connected to the first channel.

[0064] Therefore, multiple battery cell groups can be arranged along the first and second directions respectively to form an array of battery cell groups, which is beneficial to improving the energy density and total energy of the battery; moreover, the first battery cell group and the second battery cell group share the first channel, which is beneficial to improving the space utilization rate within the battery device.

[0065] In some embodiments, the first channel includes a first passage and a second passage, which are separated in a first direction by a separator.

[0066] Therefore, the pressure relief components that are opposite each other along the first direction can be reliably separated by the separator, thereby further reducing the risk of the ejected material contaminating or damaging the pressure relief components of the battery cell on the opposite side along the first direction when the battery cell experiences thermal runaway, and further reducing the risk of thermal diffusion of the battery cell along the first direction.

[0067] In some embodiments, the plurality of battery cell groups further includes a plurality of third battery cell groups, which are arranged along a second direction. Along a first direction, a 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 the side of the second battery cell group closer to the first battery cell group, and a second channel is formed on the side of the third battery cell group away from the second battery cell group. The pressure relief components of each battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group face the first channel along the first direction and are connected to the first channel. The pressure relief components of each battery cell in the third battery cell group face the second channel along the first direction and are connected to the second channel.

[0068] This allows for increased space utilization while accommodating more battery cells, and provides a pressure relief channel for each battery cell, reducing the risk of thermal runaway.

[0069] In some embodiments, the battery cell further includes an electrode assembly, the housing has a receiving space, the electrode assembly is housed in the receiving space, and the electrode terminals include 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 the side of the first housing wall opposite to the electrode assembly along the direction of gravity. In the same projection plane perpendicular to the second direction, the projections of the first electrode terminal plate and the second electrode terminal plate at least partially overlap.

[0070] Therefore, the first electrode terminal plate and the second electrode terminal plate can be arranged compactly along the first direction, reducing the space occupied in the first direction, thereby allowing the protrusion to be designed to be larger and improving support stability; moreover, designing the protrusion to be larger is beneficial to increasing the support area, thereby improving support strength and support stiffness, and is beneficial to stacking more battery cells along the direction of gravity.

[0071] In some embodiments, the first electrode terminal plates and the second electrode terminal plates of each battery cell located on the same layer along the direction of gravity are alternately arranged along the second direction, and the polarities of the first electrode terminal plates and the second electrode terminal plates are opposite. The battery device also includes a busbar, and adjacent first electrode terminal plates and second electrode terminal plates of two adjacent battery cells along the second direction are connected by the busbar.

[0072] Therefore, it is easy to achieve electrical connection between adjacent battery cells along the second direction.

[0073] In some embodiments, the first housing wall is formed with a protrusion that abuts against an adjacent battery cell along the direction of gravity; the busbar does not extend beyond the protrusion on the side of the protrusion that protrudes along the direction of gravity.

[0074] Therefore, the installation of busbars will not cause the casings of the stacked battery cells along the direction of gravity to not be able to abut each other, nor will it cause an increase in the size of each battery cell group along the direction of gravity, thus improving the volume utilization rate.

[0075] In some embodiments, the battery device includes a plurality of battery cell layers stacked along the direction of gravity, with each battery cell layer including a plurality of battery cells. The battery device also includes a plurality of support plates located between adjacent battery cell layers along the direction of gravity, with adjacent battery cell layers abutting each other through the support plates.

[0076] This can disperse the pressure on the lower battery cells, improve the stacking stability along the direction of gravity, increase the number of stacking layers along the direction of gravity, and improve the volume utilization and energy of the battery device.

[0077] In some embodiments, in the same battery cell layer, some or all of a plurality of battery cells arranged along a first direction abut against the same support plate; and / or, in the same battery cell layer, some or all of a plurality of battery cells arranged along a second direction abut against the same support plate; and / or, the support plate is configured such that at least its surface is insulated; and / or, along the direction of gravity, at least one side of the battery cell is adhered to the support plate.

[0078] This allows for the distribution of pressure on the lower battery cells and improves the overall integrity of the battery cells within the same battery cell layer, further enhancing stacking stability along the direction of gravity. Moreover, the insulating properties of the support plate help reduce the risk of leakage.

[0079] In some embodiments, the battery device further includes a housing, with at least one end of the support plate supported on the housing wall; and / or, the battery device further includes a housing and a beam member disposed on the housing, with at least one end of the support plate supported on the beam member.

[0080] Therefore, the pressure on the lower battery cells can be distributed by the support plates supported on the box wall or beam components, which can improve the stacking stability along the direction of gravity, which is conducive to increasing the number of stacking layers along the direction of gravity and improving the volume utilization and energy of the battery device.

[0081] In some embodiments, the support plate includes thermal management components.

[0082] Therefore, the support plate can not only improve the stacking stability of battery cells as mentioned above, but also perform thermal management on battery cells, thereby improving the reliability of the battery device; moreover, there is no need to set up additional thermal management components, thus improving volume utilization.

[0083] Secondly, this disclosure also provides an electrical device, which includes the battery device provided in the first aspect of this disclosure. The battery device is used to store electrical energy and supply power to the electrical device.

[0084] Because the battery pack, as described above, can improve volume utilization and the stacked battery cells along the direction of gravity can form stable support, it is possible to reduce the space occupied by the battery pack in the electrical device, or to make full use of the battery pack installation space in the electrical device, thereby increasing the energy of the battery pack and improving the range of the electrical device.

[0085] Thirdly, this disclosure also provides an energy storage device, which includes the battery device provided in the first aspect of this disclosure. The battery device is used to store electrical energy and provide electrical energy.

[0086] Because battery devices can improve volume utilization as described above, the volume of energy storage devices can be reduced, or the energy storage capacity of energy storage devices can be increased.

[0087] Fourthly, this disclosure also provides a battery cell, the battery cell including: a shell, including a shell body and a first shell wall connected to the shell body, the first shell wall being located at at least one end of the shell body along a third direction, the wall thickness of the first shell wall being greater than the wall thickness of the shell body wall, and the third direction being consistent with the gravity direction of the battery cell in use.

[0088] This improves the strength and rigidity of the first casing wall, enabling the stacking of multiple battery cells along the direction of gravity.

[0089] In some embodiments, the battery cell further includes an electrode assembly and an electrode terminal, the housing has a receiving space, the electrode assembly is housed in the receiving space, a first housing wall is formed with a protrusion, the protrusion protrudes in a third direction away from the electrode assembly; the electrode terminal is disposed on the first housing wall and located in the first housing wall at a position where no protrusion is formed.

[0090] Because the first housing wall has protrusions, its strength and rigidity are improved, thereby enhancing the support stability for adjacent battery cells along the direction of gravity and facilitating the stacking of multiple battery cells along the direction of gravity. Furthermore, since the electrode terminals are located on the first housing wall at positions where no protrusions are formed, the miniaturization of the battery cell assembly is improved.

[0091] In some embodiments, the wall thickness 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.

[0092] Because the shell wall of the main shell is of a suitable thickness, it is possible to balance the rigidity and volume utilization of the shell; because the first shell wall is of a suitable thickness, it is possible to balance the rigidity and strength of the first shell wall, enabling multi-layer stacking along the direction of gravity and improving volume utilization. Attached Figure Description

[0093] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0094] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0095] Figure 2 is a schematic diagram of the structure of an energy storage device provided in some embodiments of this disclosure;

[0096] Figure 3 is a schematic diagram of the structure of a battery device provided in some embodiments of this disclosure;

[0097] Figure 4 is an exploded perspective view of a battery cell provided in some embodiments of this disclosure;

[0098] Figure 5 is a perspective view of a battery cell provided in some embodiments of this disclosure;

[0099] Figure 6 is a perspective view of a battery cell with electrical connections provided in some embodiments of this disclosure;

[0100] Figure 7 is a perspective view of a battery cell provided in some other embodiments of this disclosure;

[0101] Figure 8 is a perspective view of a battery cell provided in some further embodiments of this disclosure;

[0102] Figure 9 is a perspective view of a battery cell provided in some other embodiments of this disclosure;

[0103] Figure 10 is a three-dimensional schematic diagram of the battery cells in an arrangement provided by some embodiments of this disclosure;

[0104] Figure 11 is a perspective view of stacked and arranged battery cells provided in some embodiments of this disclosure;

[0105] Figure 12 is a perspective view of stacked and arranged battery cells provided in some other embodiments of this disclosure;

[0106] Figure 13 is a perspective view of stacked and arranged battery cells provided in some other embodiments of the present disclosure;

[0107] Figure 14 is a schematic diagram of stacked and arranged battery cells provided in some embodiments of this disclosure;

[0108] Figure 15 is a schematic cross-sectional view of Figure 5 AA provided in some embodiments of this disclosure;

[0109] Figure 16 is a perspective view of stacked and arranged battery cells provided in some other embodiments of the present disclosure;

[0110] Figure 17 is a perspective view of stacked and arranged battery cells provided in some other embodiments of this disclosure.

[0111] Explanation of reference numerals in the attached drawings: 1000 Vehicle; 100 Battery unit; 200 Controller; 300 Motor; 2000 Energy storage device; 400 Electrical compartment; 10 Battery cell; 20 Housing; 20A First housing; 20B Second housing; 201 Housing 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 Casing ; 15 Shell body; 11 First shell wall; 111 Body part; 112 Protrusion; 12 Second shell wall; 13 Third shell wall; 14 Fourth shell wall; 2 Electrode terminal; 21 First electrode terminal plate; 22 Second electrode terminal plate; 3 Pressure relief component; 4 Spacing; 41 First channel; 411 First passage; 412 Second passage; 42 Second channel; 5 Electrode tab; 6 Electrode assembly; 7 Busbar; 8 Support plate; 9 Separator; Z Gravity direction; X First direction; Y Second direction. Detailed Implementation

[0112] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this disclosure can be combined with each other, and the detailed descriptions in the specific embodiments should be understood as explanations of the purpose of this disclosure and should not be regarded as undue limitations on this disclosure.

[0113] 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 disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0114] In the description of this disclosure, the technical terms "first," "second," "third," "fourth," "fifth," "sixth," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0115] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0116] In the description of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0117] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0118] In the description of this disclosure, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0119] In the description of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" shall be interpreted broadly and may refer to direct contact, contact through an intermediate medium, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0120] In the description of embodiments of this disclosure, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are subject to a certain degree of tolerance and / or error, including cases of being substantially parallel and substantially perpendicular.

[0121] The embodiments of this disclosure will now be described in detail.

[0122] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are being used more and more in the field of energy storage.

[0123] To improve the energy efficiency of battery devices, these devices typically consist of multiple battery cells arranged in an array. The arrangement of these cells affects the volumetric efficiency of the battery device. Furthermore, the industry is continuously demanding higher levels of volumetric efficiency and energy density from battery devices. Therefore, further optimizing the arrangement of battery cells to improve the volumetric efficiency of the battery device is one of the research and development topics.

[0124] To improve the effective utilization of limited installation space, a technical concept of stacking multiple layers of battery cells along the direction of gravity has been proposed. However, stacking multiple layers of battery cells along the direction of gravity can easily lead to insufficient support along the direction of gravity, resulting in deformation or damage of the battery cells, or instability in the stacking.

[0125] Research has shown that thickening the casing wall of individual battery cells perpendicular to the direction of gravity can improve the strength and stiffness of this wall, thereby enabling stable support between stacked battery cells along the direction of gravity. This is beneficial for stacking multiple battery cells along the direction of gravity, thus improving the volume utilization rate of the battery device. This is particularly advantageous when horizontal installation space for the battery device is limited, as it allows for full utilization of space along the direction of gravity.

[0126] Based on this technical concept, this disclosure provides a battery device including at least two battery cells. Each battery cell includes: a shell, including a shell body and a first shell wall connected to the shell body. The first shell wall is located at at least one end of the shell body along the direction of gravity, and the wall thickness of the first shell wall is greater than the wall thickness of the shell body wall. Along the direction of gravity, at least two battery cells are stacked, and the first shell wall abuts against the adjacent battery cell.

[0127] This allows for the arrangement of multiple battery cells along the direction of gravity. Even with limited horizontal space for battery installation, this arrangement maximizes space utilization and increases the energy output of the battery device. Furthermore, the increased thickness of the first housing wall compared to the main housing wall enhances its strength and rigidity. This provides stable support between the stacked battery cells, facilitating the stacking of multiple cells along the direction of gravity and further improving the volume utilization of the battery device.

[0128] The battery device provided in this disclosure can be used, but is not limited to, in electrical devices such as energy storage devices, vehicles, ships, or aircraft.

[0129] This disclosure also provides an electrical device including the aforementioned battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0130] This disclosure also provides an energy storage device including the above-described battery device, the energy storage device including an energy storage container, an energy storage cabinet, etc.

[0131] In addition, embodiments of this disclosure also provide a battery cell for the aforementioned battery device.

[0132] For ease of explanation, an example of an electrical device according to an embodiment of this disclosure, namely a vehicle 1000, will be used for description. The description will now be provided in conjunction with the accompanying drawings.

[0133] Figure 1 is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this disclosure. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. As shown in Figure 1, a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0134] In some embodiments of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0135] Figure 3 is a schematic diagram of the structure of a battery device provided in some embodiments of this disclosure.

[0136] The battery apparatus mentioned in the embodiments of this disclosure may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 10 (see FIG. 4), which are connected in series, parallel, or mixed connections via busbars. The electrical connection of multiple battery cells can form a power supply circuit, and connecting the electric vehicle's motor 300 or other electrical appliances to the power supply circuit can form an electrical loop.

[0137] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0138] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0139] In some embodiments, the battery device may be a battery pack, which includes a housing 20 and one or more individual battery cells housed within the housing.

[0140] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0141] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0142] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0143] The following describes some embodiments of the present disclosure in detail with reference to Figures 3 to 17.

[0144] Figure 3 is a structural schematic diagram of a battery device provided in some embodiments of the present disclosure; Figure 4 is an exploded perspective view of a battery cell provided in some embodiments of the present disclosure; Figure 5 is a perspective view of a battery cell provided in some embodiments of the present disclosure; Figure 6 is a perspective view of a battery cell with electrical connections provided in some embodiments of the present disclosure; Figure 7 is a perspective view of a battery cell provided in yet another embodiment of the present disclosure; Figure 8 is a perspective view of a battery cell provided in yet another embodiment of the present disclosure; Figure 9 is a perspective view of a battery cell provided in yet another embodiment of the present disclosure; Figure 10 is a perspective view of battery cells in an arranged state provided in some embodiments of the present disclosure; Figure 11 is a perspective view of the present disclosure. Figure 12 is a perspective view of stacked and arranged battery cells provided in some embodiments of the present disclosure; Figure 13 is a perspective view of stacked and arranged battery cells provided in some other embodiments of the present disclosure; Figure 14 is a schematic diagram of stacked and arranged battery cells provided in some embodiments of the present disclosure; Figure 15 is a cross-sectional view of Figure 5 provided in some embodiments of the present disclosure; Figure 16 is a perspective view of stacked and arranged battery cells provided in some other embodiments of the present disclosure; Figure 17 is a perspective view of stacked and arranged battery cells provided in some other embodiments of the present disclosure.

[0145] In the description of the embodiments of this disclosure, for ease of explanation, the direction of arrow X represents the "first direction," the direction of arrow Y represents the "second direction," and the direction of arrow Z represents the "gravity direction" and "third direction." It should be noted that the gravity direction in this document refers to the case where the battery device is placed generally horizontally.

[0146] The first aspect of this disclosure provides a battery device 100, as shown in FIG3. The battery device 100 includes at least two battery cells 10, as shown in FIG4 to 9 and FIG15. Each battery cell 10 includes: a housing 1, including a housing body 15 and a first housing wall 11 connected to the housing body 15. The first housing wall 11 is located at at least one end of the housing body 15 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. As shown in FIG3, FIG11 to 14, FIG16 and FIG17, at least two battery cells 10 are stacked along the gravity direction Z, wherein the first housing wall 11 abuts against the adjacent battery cell 10.

[0147] In some embodiments, as shown in Figures 4 to 9, the battery cell includes a casing 1. The casing 1 can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing 1), or an aluminum-plastic film, etc. The battery cell generally also includes an electrode assembly 6. In some embodiments, the casing 1 can be a sealed structure or a non-sealed structure. As an example, when the casing 1 is a non-sealed structure, the casing 1 serves to protect the electrode assembly 6, and a sealing bag can be included between the casing 1 and the electrode assembly 6. The sealing bag is used to encapsulate the electrode assembly 6 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the casing 1 is a sealed structure, it is used to encapsulate the electrode assembly 6 and the electrolyte, etc.

[0148] In some embodiments, as shown in FIG4, the battery cell 10 includes an electrode assembly 6. The electrode assembly 6 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrode to prevent short circuits between the positive and negative electrodes, while allowing active ions to pass through. In the embodiment shown in FIG4, two stacked wound bodies formed by stacking and winding the positive electrode, negative electrode, and separator are shown as the electrode assembly 6. However, the electrode assembly 6 is not limited to the winding structure shown in FIG4; for example, it can also be a stacked structure or other structural forms.

[0149] As an example, the battery cell 10 can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells. In the embodiments shown in Figures 4 to 17, for ease of explanation, a battery cell with a rectangular outer shell is used as an example for illustration.

[0150] In some embodiments, as shown in FIG4, the outer casing 1 includes a plurality of casing walls, some of which are interconnected to form a casing body 15 and enclose a space with an opening. The opening can be closed by another casing wall (e.g., the first casing wall 11) to form a receiving space for accommodating the electrode assembly 6 and substances such as electrolytes. The outer casing 1 may have one or more openings. The casing wall that closes the opening (e.g., the first casing wall 11) may also be configured as a top cover. Exemplarily, the casing body 15 may be formed by bending or welding a sheet metal; or by stamping; or by casting.

[0151] In some embodiments, as shown in FIG4, a shell wall is provided at least one end of the shell body 15 along the gravity direction Z. For ease of description, the shell wall is named "first shell wall 11". The first shell wall 11 can be the top wall and / or bottom wall of the shell wall in the outer shell 1.

[0152] In the embodiments of this disclosure, the first housing wall 11 mainly refers to the portion that encloses the receiving space formed by the housing body 15. In some specific embodiments, the top cover may also include a mounting flange (not shown in the figure) connected to the first housing wall 11, which can extend into the receiving space. In the embodiments of this disclosure, the first housing wall 11 does not include a mounting flange. The top cover can be connected to other housing walls by means of bonding and / or welding.

[0153] In some embodiments, as shown in Figures 11 to 16, in a plurality of battery cells 10 stacked along the gravity direction Z, a first housing wall 11 abuts against an adjacent battery cell 10. Optionally, the first housing wall 11 may abut against a first housing wall 11 of an adjacent battery cell 10 (not shown), or it may abut against a housing wall of an adjacent battery cell 10 that is opposite to the first housing wall 11 along the gravity direction (e.g., a fourth housing wall 14).

[0154] To improve the stiffness of the first housing wall of the battery cells stacked along the direction of gravity and enhance support stability, the wall thickness of the first housing wall 11, which serves as the support surface, is increased.

[0155] In some embodiments, as shown in Figures 4 and 15, along the gravity direction Z, the wall thickness H3 of the first shell wall 11 is greater than the wall thickness H4 of the shell body 15. It should be noted that, using the orientation shown in Figures 4 and 15 as an example, the wall thickness H3 of the first shell wall 11 refers to the distance between the upper and lower edges of the first shell wall 11 (the portion of the first shell wall 11 that is neither locally thickened nor locally thinned) along the gravity direction Z. Furthermore, during the formation of the first shell wall 11 and the shell body 15, slight variations in local thickness may occur due to processing techniques (e.g., slight variations in thickness at bent sections due to stamping or bending). Unless otherwise specified, the impact of such slight variations on the overall thickness of the shell wall can be ignored in the embodiments of this disclosure.

[0156] 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 perpendicular to the direction of gravity Z. The first housing wall includes a body portion 111 and a protrusion 112 that protrudes from the body portion 111 along the direction of gravity Z toward the side opposite to the electrode assembly 6 (the upper side in the figure). The protrusion 112 and the body portion 111 are achieved by partially bending the first housing wall. The thickness of the body portion 111 along the direction of gravity and the thickness of the protrusion 112 along the direction of gravity are both approximately 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.

[0157] In another embodiment, the protrusion 112 is formed on the first housing wall 11 by local thickening (e.g., adding thickening blocks) as shown in FIG9, in which case the thickness of the protrusion 112 is not included in the thickness of the first housing wall 11.

[0158] Additionally, it should be noted that the wall thickness of the shell body 15 refers to the thickness of the portion of the shell body 15 that is not locally thickened or thinned. Furthermore, by way of example, the shell body 15 includes: a second shell wall 12 perpendicular to the first direction X and disposed opposite to it; a third shell wall 13 perpendicular to the second direction Y and disposed opposite to it; and a fourth shell wall 14 perpendicular to the gravity direction Z and disposed opposite to the first shell wall 11. The wall thickness of the shell body 15 refers to the wall thickness of the second shell wall 12, the third shell wall 13, and the fourth shell wall 14. Thickness can be measured using common methods, such as vernier calipers.

[0159] This allows for the arrangement of multiple battery cells along the Z-direction of gravity. Even with limited horizontal space for battery installation, the space along the Z-direction can be fully utilized to arrange multiple battery cells, thereby improving space utilization and the energy of the battery device. Furthermore, since the wall thickness H3 of the first housing wall 11 is greater than the wall thickness H4 of the housing body 15, the strength and rigidity of the first housing wall 11 are improved. This allows for stable support between the battery cells 10 stacked along the Z-direction of gravity, facilitating the stacking of multiple battery cells along the Z-direction and further improving the volume utilization of the battery device.

[0160] In some embodiments, the first housing wall 11 is formed with a protrusion 112, which abuts against the adjacent battery cell 10 along the gravity direction Z; each battery cell 10 also includes an electrode terminal 2, which is disposed on the first housing wall 11 and located in the first housing wall 11 at a position where the protrusion 112 is not formed.

[0161] In some embodiments, as shown in Figures 4 to 9, the first housing wall 11 includes a body portion 111 and a protrusion 112 that protrudes from the body portion 111 in the direction of gravity Z away from the electrode assembly 6 (the upper side in the figure). This disclosure does not specifically limit the shape of the body portion 111 and the protrusion 112. For example, the protrusion 112 can be a cuboid or a cylinder, etc.

[0162] In some embodiments, for ease of understanding, as shown in Figures 4, 5, 7, 8, and 9, the part within the dashed frame O1 is the main body 111, and the part within the dashed frame O2 is the protrusion 112. It should be noted that the dashed frames are used to distinguish them for ease of understanding and explanation; for the first housing wall 11, the main body 111 and the protrusion 112 can be integrally connected.

[0163] The protrusion 112 can be formed by bending the first housing wall 11 into a concave-convex shape as shown in Figures 4 to 8, or it can be achieved by locally thickening the first housing wall 11 as shown in Figure 9, wherein the wall thickness H3 of the first housing wall 11 does not include the thickness of the locally thickened area.

[0164] In some embodiments, as shown in Figures 4 to 8, the first housing wall 11 has a protrusion 112, which is formed by forming the first housing wall 11 with an uneven 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.

[0165] 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.

[0166] Optionally, as shown in Figures 5 to 9, the protrusion 112 can be one, two, or even three or more. Along the direction perpendicular to the direction of gravity Z, the protrusion 112 can be located near the end of the first housing wall 11, or it can be located in the general middle region of the first housing wall 11.

[0167] For example, when there is only one protrusion 112, as shown in FIG7, the protrusion 112 is located on one side of the body portion 111 along the first direction X. The protrusion 112 may extend along the first direction to one end of the first housing wall 11 along the first direction (e.g., the right end shown in FIG7), and the body portion 111 may extend along the first direction to the other end of the first housing wall 11 along the first direction (e.g., the left end shown in FIG7); or as shown in FIG8, the body portion 111 is located on both sides of the protrusion 112 along the first direction X.

[0168] For example, when there are two protrusions 112, as shown in Figures 4 to 6 and Figure 9, along the first direction X, the main body 111 can be located at approximately the middle position 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 (for example, the left end and the right end shown in Figure 5). Alternatively, the two protrusions 112 can not extend to both ends of the first housing wall 11 along the first direction X, but the main body 111 can still exist between the protrusions 112 and the ends (as shown in Figure 9).

[0169] The above embodiments are merely examples illustrating the number and positional relationship of the protrusions 112 and the body portion 111. There may be more protrusions 112 and body portions 111. Of course, the protrusions 112 and body portions 111 may also have other positional relationships. For example, the protrusions 112 and body portions 111 may also be arranged along the second direction Y, which will not be elaborated here.

[0170] In some embodiments, the electrode assembly 6 includes a tab 5, and the electrode terminal 2 is electrically connected to the tab 5 to conduct current into or out of the electrode assembly 6.

[0171] In some embodiments, the electrode terminal 2 is at least partially exposed in the body portion 111, and does not extend beyond the protrusion 112 in the direction of gravity Z. "Exposed" includes being exposed in the body portion 111 but not protruding from the body portion 111 in the direction of gravity Z, and also includes protruding from the body portion 111 in the direction of gravity Z.

[0172] In some embodiments, as shown in Figures 11 to 14, 16, or 17, in a plurality of battery cells 10 stacked along the gravity direction Z, the protrusion 112 abuts against the adjacent battery cell 10. Optionally, the protrusion 112 may also abut against the protrusion 112 of the adjacent battery cell 10 (not shown), or it may abut against the housing wall (e.g., the fourth housing wall 14) of the adjacent battery cell 10. It should be noted that, for ease of explanation, for two housing walls opposite each other along the gravity direction, the housing wall with the protrusion 112 is referred to as the first housing wall 11, and the housing wall without the protrusion 112, for example, formed as a flat plate, is referred to as the fourth housing wall 14.

[0173] Because the first housing wall 11 has protrusions 112, its strength and rigidity are improved, thereby enhancing the support stability for adjacent battery cells 10 and facilitating the stacking of multiple battery cells along the gravity direction Z. Furthermore, since the electrode terminals 2 are located on the first housing wall 11 at positions where the protrusions 112 are not formed, the stacked battery cells occupy as little space as possible along the gravity direction Z, further maximizing the use of space in the gravity direction for arranging multiple layers of battery cells, thus improving space utilization and the energy of the battery device.

[0174] In some embodiments, as shown in Figures 7 and 8, in the first housing wall 11, the body portion 111 and the protrusion 112 are connected along the first direction X. The first housing wall 11 includes a protrusion 112, and the electrode terminal 2 is located on one or both sides of the protrusion 112 along the first direction X. The first direction X is perpendicular to the gravity direction Z.

[0175] In some embodiments, as shown in FIG4, the electrode assembly 6 includes a first electrode and a second electrode with opposite polarities, which can conduct current from the electrode assembly 6. One of the first electrode and the second electrode can be a positive electrode and the other a negative electrode.

[0176] In some embodiments, as shown in FIG4, the electrode terminal 2 includes a first electrode terminal and a second electrode terminal. The first electrode terminal is electrically connected to a first electrode tab, and the second electrode terminal is electrically connected to a second electrode tab, so as to introduce or extract the current in the electrode assembly 6.

[0177] In a specific embodiment, as shown in FIG8, along the first direction X, the protrusion 112 is located at approximately the middle position of the first housing wall 11, and the first electrode terminal and the second electrode terminal are located on one side of the protrusion 112 (e.g., the left or right side as shown in FIG8), or the first electrode terminal and the second electrode terminal are located on both sides of the protrusion 112 (e.g., the left and right sides as shown in FIG8).

[0178] In one specific embodiment, as shown in FIG7, along the first direction X, the protrusion 112 is located on one side of the body portion 111 (e.g., the right side shown in FIG7), and the first electrode terminal and the second electrode terminal are located on the body portion 111 and on one side of the protrusion 112 (e.g., the left end shown in FIG7).

[0179] Therefore, the entire protrusion 112 can be used to support the battery cells of adjacent layers, which helps to improve the support stability; moreover, the position of the electrode terminals can be flexibly designed.

[0180] In some embodiments, as shown in Figures 5 and 9, in the first housing wall 11, the body portion 111 and the protrusion 112 are connected along the first direction X. The first housing wall 11 includes at least two protrusions 112, and the electrode terminal is located between two adjacent protrusions 112 along the first direction X, which is perpendicular to the gravity direction Z.

[0181] In one specific embodiment, as shown in Figures 5 and 9, two protrusions 112 are arranged along the first direction X, with an electrode terminal located between the two protrusions 112. The two protrusions 112 may extend along the first direction X to both ends of the first housing wall 11 along the first direction (e.g., the left and right ends shown in Figure 5), or they may not extend along the first direction X to both ends of the first housing wall 11 along the first direction (e.g., the left and right ends shown in Figure 9).

[0182] In other specific embodiments, there may be three, four or more protrusions 112. For example, there may be three protrusions, with a body portion between each adjacent protrusion. The electrode terminal is located in the body portion. In a state of stacking along the direction of gravity Z, all three protrusions abut against the adjacent battery cell.

[0183] There are no particular restrictions on the location of two or more protrusions, but a generally symmetrical arrangement is beneficial to improving support stability.

[0184] Therefore, by having at least two protrusions 112 abut against adjacent battery cells and the electrode terminals located between adjacent protrusions 112, the support stability in the Z-direction of gravity can be improved. Moreover, the position of the electrode terminals can be flexibly designed.

[0185] In some embodiments, as shown in FIG4, the wall thickness of the shell 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.

[0186] 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 0.1 mm to 2.0 mm. Optionally, the wall thickness of the shell body 15 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, etc., or other values ​​within the above range.

[0187] In some embodiments, the first housing wall 11 is flat (not shown), and the wall thickness H3 of the first housing wall 11 is in the range of 0.8 mm to 3.0 mm. In other embodiments, as shown in Figures 3 to 9, the first housing wall 11 has a connected protrusion 112 and a body portion 111, the wall thickness H3 of the protrusion 112 and the body portion 111 being substantially the same and both in the range of 0.8 mm to 3.0 mm.

[0188] 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., or other values ​​within the above range.

[0189] For example, the wall thickness of the shell body 15 can be 0.2mm, and 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., or other values ​​within the above range. The wall thickness of the shell body 15 can be 1.9 mm, and the wall thickness H3 of the first shell wall 11 along the gravity direction Z can be 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.

[0190] Because the shell wall of the shell body 15 is of a suitable thickness, the rigidity and volume utilization of the shell can be balanced; because the first shell wall 11 is of a suitable thickness, the rigidity and strength of the first shell wall 11 can be balanced, and multi-layer stacking along the direction of gravity can be achieved, thereby improving the volume utilization.

[0191] In some embodiments, the wall thickness of the first housing wall is in the range of 1.5 mm to 2.5 mm.

[0192] 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., or other values ​​within the above range.

[0193] Because the first shell wall is of a suitable thickness, the rigidity and strength of the first shell wall can be further balanced, enabling multi-layer stacking along the direction of gravity and improving volume utilization.

[0194] In some embodiments, the wall thickness H3 of the first housing wall 11 along the gravity direction Z can be adaptively adjusted according to the number of battery cells in the battery device along the gravity direction Z and the weight of the battery cells. When the number of battery cells in the battery device along the gravity direction Z is greater, the wall thickness H3 of the first housing wall 11 of the battery cells in that column along the gravity direction Z is thicker. Or, when the number of battery cells along the gravity direction Z is the same, the heavier the weight of a single battery cell, the thicker the wall thickness H3 of the first housing wall 11 of the battery cell located below it along the gravity direction Z is. Or, along the gravity direction Z, the wall thickness H3 of the first housing wall 11 of the battery cell located lower than it is thicker.

[0195] In some embodiments, as shown in Figures 11 to 14, 16 or 17, a plurality of battery cells 10 form a plurality of battery cell groups 30, each battery cell group 30 including n battery cells 10 stacked along the direction of gravity, where n is a natural number greater than or equal to 2 and less than or equal to 10.

[0196] n battery cells 10 stacked along the direction of gravity form a battery cell group 30, and multiple battery cell groups 30 are arranged along a first direction X and / or a second direction Y to form a battery device 100.

[0197] The number of battery cells 10 stacked along the direction of gravity Z in each battery cell group 30 can be the same or different.

[0198] Optionally, each battery cell group 30 can stack 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 battery cells 10 along the direction of gravity.

[0199] This allows for the stacking of an appropriate number of battery cells based on the height of the internal space of the battery device along the direction of gravity, thereby improving volume utilization.

[0200] The following section provides a detailed explanation of the wall thickness H3 of the first housing wall 11, which is designed to balance the rigidity requirements of the first housing wall 11 with the need to improve the volume utilization of the battery device, when the number of battery cells 10 stacked along the direction of gravity Z varies.

[0201] In some embodiments, n is 2, and the wall thickness of the first housing wall is in the range of 0.8 mm to 1.0 mm.

[0202] Each battery cell group 30 can stack two battery cells 10 along the gravitational direction Z. 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 0.8mm to 1.0mm. Optionally, the wall thickness H3 of the first housing wall 11 can be 0.8mm, 0.9mm, or 1.0mm, etc., or other values ​​within the above range.

[0203] Since two battery cells are stacked along the direction of gravity, and the wall thickness of the first housing wall 11 is in the range of 0.8mm to 1.0mm, a suitable wall thickness of the first housing wall 11 can be selected, which can satisfy the strength and rigidity of the first housing wall 11, thereby enabling stable support to be formed between the battery cells 10 stacked along the direction of gravity Z, which is also beneficial to saving materials and improving the volume utilization rate of the battery device.

[0204] In some embodiments, n is 2 or 3, and the wall thickness of the first housing wall is in the range of 1.0 mm to 2.0 mm.

[0205] Each battery cell group 30 can stack two or three battery cells 10 along the gravitational direction Z. 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 1.0 mm to 2.0 mm. Optionally, the wall thickness H3 of the first housing wall 11 can be 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, etc., or other values ​​within the above range.

[0206] Since two or three battery cells are stacked along the direction of gravity, and the thickness of the first housing wall is in the range of 1.0 mm to 2.0 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.

[0207] In some embodiments, n is 2, 3, or 4, and the wall thickness H3 of the first housing wall is in the range of 1.5 mm to 2.5 mm. For example, each battery cell group 30 has 4 battery cells 10 stacked along the direction of gravity, the wall thickness of the first housing wall 11 is 2.5 mm, and the wall thickness of the main body of the housing is 0.2 mm.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] In some embodiments, as shown in FIG4, the battery cell 10 further includes an electrode assembly 6, the housing has a receiving space, the electrode assembly 6 is housed in the receiving space, and the housing body 15 includes two second housing walls 12 disposed 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%.

[0213] 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.

[0214] Along the first direction X, the ratio of the length L6 of the electrode assembly 6 to the distance L7 between the opposing walls of the two second housing walls 12 can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%, etc., or of course, other values ​​within the above range.

[0215] 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 to reduce the degree of bending deformation of the second housing wall 12 along the first direction X.

[0216] In some embodiments, the shell body 15 further includes two third shell walls 13 disposed opposite to each other along a second direction Y, the second direction Y being perpendicular to the gravity direction Z and the first direction X, and along the second direction Y, the ratio of the width of the electrode assembly 6 to the distance between the opposing walls of the two third shell walls 13 is greater than 90% and less than 100%.

[0217] Along 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 along the second direction Y, and the distance L9 between the opposite walls of the third housing wall 13 refers to the distance between the inner surfaces of the two third housing walls 13.

[0218] Along the second direction Y, the ratio of the width L8 of the electrode assembly 6 to the distance L9 between the opposing walls of the two third housing walls 13 can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%, etc., or of course, other values ​​within the above range.

[0219] 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 third housing wall 13 in the second direction Y within a range of nearly the entire length along the first direction X.

[0220] In some embodiments, the battery cell 10 further includes an electrode assembly 6, the housing 1 has a receiving space, the electrode assembly 6 is housed in the receiving space, a 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, and along the gravity direction 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 opposing wall surface of the fourth housing wall 14 is greater than 80% and less than 100%.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] In some embodiments, as shown in Figures 5 and 8, the length L1 of the first housing wall 11 along the first direction X is in the range of 120 mm to 1200 mm, and the first direction X is perpendicular to the gravity direction Z and is consistent with the length direction of the battery cell 10.

[0226] 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.

[0227] 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.

[0228] Therefore, the embodiments of this disclosure 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.

[0229] In some embodiments, the length of the first housing wall 11 along the first direction X is in the range of 120 mm to 600 mm.

[0230] 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., or other values ​​within the above range.

[0231] Therefore, the embodiments of this disclosure 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.

[0232] In some embodiments, the length of the first housing wall 11 along the first direction X is in the range of 150 mm to 400 mm.

[0233] 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., or other values ​​within the above range.

[0234] Therefore, the embodiments of this disclosure 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.

[0235] In some embodiments, as shown in Figures 5 and 8, a protrusion 112 is formed on the first housing wall 11, which abuts against the adjacent battery cell 10 along the gravity direction Z; the ratio of the length of the protrusion 112 along the first direction X to the length of the first housing wall 11 along the first direction X is more than 50% and less than 98%.

[0236] The length of the protrusion 112 along the first direction X refers to the distance between the two edges of the protrusion 112 along the first direction X. Taking one protrusion 112 as an example, the length of the protrusion 112 along the first direction X is the length L2 shown in Figure 8; taking two protrusions 112 as an example, the length of the protrusion 112 along the first direction X is the sum of the lengths L3 and L4 shown in Figure 5; when there are more than one protrusion 112, the length of the protrusion 112 along the first direction X refers to the sum of the lengths of each protrusion 112 along the first direction X.

[0237] 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.

[0238] 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.

[0239] In some embodiments, as shown in FIG4, the width L5 of the first housing 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.

[0240] 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.

[0241] 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.

[0242] Therefore, the embodiments of this disclosure can be applied to battery cells of various widths according to actual conditions, thereby producing battery devices that match the installation space of the battery device and have high volume utilization and high energy.

[0243] In some embodiments, as shown in FIG4, the width L5 of the first housing wall 11 along the second direction Y is in the range of 25mm to 45mm.

[0244] 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.

[0245] Therefore, the embodiments of this disclosure can be applied to battery cells of various widths according to actual conditions, thereby producing battery devices that match the installation space of the battery device and have high volume utilization and high energy.

[0246] In some embodiments, as shown in FIG5, the maximum height H2 of the battery cell 10 along the gravity direction Z is in the range of 80mm to 250mm.

[0247] The maximum height H2 of the battery cell along the direction of gravity Z refers to the distance between the two edges of the battery cell that are furthest apart along the direction of gravity Z (for example, as shown in Figure 5, the distance between the outer surface of the fourth housing wall 14 and the upper surface of the protrusion 112 along the direction of gravity Z).

[0248] Optionally, the maximum height H2 of the battery cell along the direction of gravity Z can be 80mm, 90mm, 100mm, 150mm, 200mm, 210mm, 220mm, 230mm, 240mm or 250mm, etc., or other values ​​within the above range.

[0249] Therefore, the embodiments of this disclosure can be applied to various battery cells of different heights 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.

[0250] In some embodiments, the maximum height of the battery cell 10 along the direction of gravity Z is in the range of 100mm to 200mm.

[0251] The maximum height of the battery cell 10 along the direction of gravity Z is, for example, the distance from the surface of the protrusion 112 in the first housing wall 11 (on the surface outside the outer casing 1) to the surface of the fourth housing wall 14 (on the surface outside the outer casing 1).

[0252] Optionally, the maximum height H2 of the battery cell 10 along the direction of gravity Z can be 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 1700mm, 1800mm, 190mm or 200mm, etc., or other values ​​within the above range.

[0253] Therefore, the embodiments of this disclosure can be applied to various battery cells of different heights 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.

[0254] In some embodiments, the shell body 15 includes two second shell walls 12 disposed opposite to each other 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 disposed on at least one second shell wall 12.

[0255] In some embodiments, the battery cell further includes a pressure relief component 3, which is used to open in the event of thermal runaway of the battery cell to release the internal gas of the battery cell.

[0256] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief component 3 performs an action or a weak structure provided in the pressure relief component 3 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0257] As an example, the pressure relief component 3 can be integrally formed with the shell body 15.

[0258] As an example, the pressure relief component 3 can also be separately installed and connected to the shell body 15.

[0259] The term "actuation" as used in this disclosure refers to the activation or actuation of the pressure relief component 3 to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief component 3 may include, but are not limited to: movement of components within the pressure relief component 3 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief component 3, etc. When the pressure relief component 3 is activated, the high-temperature, high-pressure substances inside the battery cell are discharged outwards from the activated portion as waste. This method enables pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0260] In some embodiments, when the housing 1 is a non-sealed structure, the pressure relief component 3 can be configured as a through hole for discharging gas inside the battery cell.

[0261] Emissions from individual battery cells mentioned in this disclosure include, but are not limited to: electrolytes, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated during the reaction, flames, etc.

[0262] In some embodiments, as shown in Figures 5 to 9, the first housing wall 11 is one or both of the two housing walls opposite each other along the direction of gravity in the outer shell 1; the second housing wall 12 is a side wall connected to the first housing wall 11. Optionally, pressure relief components 3 can be provided on both second housing walls 12, or pressure relief components 3 can be provided on one of the second housing walls 12. The number of pressure relief components 3 can be one, two, or other suitable numbers. The structure of the pressure relief component 3 itself can adopt a known structure.

[0263] Since the pressure relief component 3 is located on the second housing wall 12 rather than the first housing wall 11 where the electrode terminals are located, it is not necessary to leave a channel for venting the pressure relief gas in the gravity direction Z. This helps to reduce the space occupied by multiple battery cells stacked in the gravity direction Z and improve volume utilization. Moreover, it can reduce the probability of the ejected material falling on the electrode terminals when the pressure relief component 3 is depressurized, realize the separation of electricity and gas, and reduce the risk of short circuit or even fire caused by thermal runaway of battery cells.

[0264] In some embodiments, as shown in Figures 5 to 9, the shell body 15 further includes two third shell walls 13 disposed opposite each other along the second direction Y, wherein the area of ​​the first shell wall 11 and the second shell wall 12 is smaller than the area of ​​the third shell wall 13.

[0265] In some embodiments, the third housing wall 13 is a large surface in the sidewall of the housing wall. The pressure relief component is formed in the second housing wall 12, meaning that the pressure relief component is not provided on the large surface.

[0266] Here, for example, the area of ​​the first housing wall 11 can be calculated by its projection onto a projection plane perpendicular to the direction of gravity, the area of ​​the second housing wall 12 can be calculated by its projection onto a projection plane perpendicular to the first direction X, and the area of ​​the third housing wall 13 can be calculated by its projection onto a projection plane perpendicular to the second direction Y. Therefore, since the pressure relief component 3 is not formed on the larger third housing wall 13, the space occupied by the channel for discharging the pressure relief gas can be reduced, further improving the space utilization rate within the battery device.

[0267] In some embodiments, as shown in Figures 11 to 17, 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 plurality of battery cell groups 30 include a first battery cell group 301 and a second battery cell group 302. The first battery cell group 301 and the second battery cell group 302 are arranged at intervals along the first direction X. At least some of the battery cells 10 in the first battery cell group 301 and / or at least some of the battery cells 10 in the second battery cell group 302 are arranged such that their respective pressure relief components 3 face the interval 4.

[0268] The interval 4 here is used at least to form a pressure relief space to accommodate the discharge from the pressure relief component 3; when more intervals 4 are connected to each other, a larger pressure relief space or pressure relief channel can be formed. Optionally, the pressure relief space or pressure relief channel can be connected to the external space.

[0269] In some embodiments, multiple battery cells 10 are stacked along the gravity direction Z to form a battery cell group 30. 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 housing space of the battery device and the height of the battery cells 10 themselves. The number of battery cells in each battery cell group can be the same or different.

[0270] In some embodiments, the plurality of battery cell groups 30 include a first battery cell group 301 and a second battery cell group 302, which are arranged at intervals along a first direction X. The pressure relief components 3 of some battery cells in the first battery cell group 301 may face the interval 4 (see FIG. 13), or all battery cells in the first battery cell group 301 may face the interval 4 (see FIGS. 11, 12, and 16); similarly, the pressure relief components 3 of some battery cells 10 in the second battery cell group 302 may face the interval 4 (see FIG. 13), or all battery cells 10 in the first battery cell group 301 may face the interval 4 (see FIGS. 11, 12, and 16).

[0271] It should be noted that for those pressure relief components 3 that do not face the interval 4, other intervals can be further set to form a pressure relief space for those pressure relief components 3.

[0272] Since multiple battery cells 10 form multiple battery cell groups 30, and each battery cell group 30 includes multiple battery cells 10 stacked along the direction of gravity Z, the battery device 100 can include more battery cells and can provide higher energy. Since at least some of the battery cells in the first battery cell group 301 and / or at least some of the battery cells in the second battery cell group 302 are arranged with their respective pressure relief components 3 facing the interval 4, the first battery cell group 301 and the second battery cell group 302 can share the interval 4, which is beneficial to improving the space utilization rate within the battery device. Moreover, the fact that the pressure relief components 3 of some battery cells can face the interval 4 also facilitates the flexible design of the arrangement orientation of the battery cells.

[0273] In some embodiments, as shown in Figures 11, 12 and 16, the first battery cell group 301 and the second battery cell group 302 are arranged such that the pressure relief component 3 of each battery cell 10 in the first battery cell group 301 and the pressure relief component 3 of each battery cell 10 in the second battery cell group 302 are both oriented toward the interval 4.

[0274] The spacing 4 can be determined based on factors such as the size of the battery pack, the size of the individual battery cells 10, and the amount of emissions from the pressure relief component 3. The width of the spacing 4 along the first direction X can also be considered from the perspective of suppressing thermal runaway. Alternatively, a separator 9 can be added to the spacing 4 to suppress thermal runaway. Here, thermal runaway refers to the phenomenon where thermal runaway of one battery cell triggers subsequent thermal runaway of other battery cells.

[0275] 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 may partially overlap, completely overlap, or not overlap at all. Optionally, along the first direction X, a separator 9 may be provided between the first battery cell group 301 and the second battery cell group 302. 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 are located within the projection range of the separator 9, and the projections of the pressure relief components 3 of each battery cell 10 in the second battery cell group 302 are also located within the projection range of the separator 9. Therefore, the first battery cell group 301 and the second battery cell group 302 share the space 4, which is beneficial to improving the space utilization rate within the battery device.

[0276] In some embodiments, as shown in FIG12, the pressure relief component 3 of each battery cell 10 in the first battery cell group 301 and the pressure relief component 3 of each battery cell 10 in the second battery cell group 302 are offset along the gravity direction Z, and in the same projection plane perpendicular to the first direction, the projection of the pressure relief component 3 of each battery cell 10 in the first battery cell group 301 and the projection of the pressure relief component 3 of each battery cell 10 in the second battery cell group 302 do not overlap.

[0277] In some embodiments, as shown in FIG12, 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).

[0278] 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.

[0279] 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.

[0280] In some embodiments, as shown in FIG13, 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 component 3 of the other battery cells 10.

[0281] The direction in which the opening of the pressure relief component 3 faces is called the orientation of the pressure relief component.

[0282] 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.

[0283] In a specific embodiment, as shown in FIG13, 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.

[0284] 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.

[0285] In some embodiments, as shown in FIG13, in the same battery cell group 30, the pressure relief components 3 of adjacent battery cells along the gravity direction Z are oriented in opposite directions along the first direction X. In the same layer, the pressure relief components 3 of the battery cells in the first battery cell group 301 and the battery cells in the second battery cell group 302 are oriented in the same direction along the first direction X.

[0286] In a battery device with multiple battery cell groups, where each battery cell group comprises multiple battery cells stacked along the direction of gravity Z, battery cells at the same height can be referred to as a layer of battery cells. In other words, a battery cell array formed by arranging multiple battery cell groups can include multiple layers of battery cells. Taking Figure 13 as an example, the battery cells in the same layer can be battery cells 10 from the first battery cell group 301 and the second battery cell group 302 in the first layer from the top, or battery cells 10 from the first battery cell group 301 and the second battery cell group 302 in the second layer or another layer from the top.

[0287] In one specific embodiment, in the first battery cell group 301, the pressure relief components 3 of adjacent battery cells along the gravity direction Z are oriented in opposite directions along the first direction X. For example, in adjacent battery cells, the pressure relief component 3 of one battery cell is oriented towards the second battery cell group 302 along the first direction X, and the pressure relief component 3 of the other battery cell is oriented towards the side away from the second battery cell group 302 along the first direction X.

[0288] Along the direction of gravity Z, within the same layer, the pressure relief components 3 of the battery cells in the first battery cell group 301 and the battery cells in the second battery cell group 302 have the same orientation along the first direction X (e.g., as shown in Figure 13, they all face to the left or right). For example, from the top, the pressure relief components 3 of the battery cells in the first battery cell group 301 and the battery cells in the second battery cell group 302 of the first layer all face to the left in the figure, and from the top, the pressure relief components 3 of the battery cells in the first battery cell group 301 and the battery cells in the second battery cell group 302 of the second layer all face to the right in the figure.

[0289] Therefore, since the pressure relief components 3 of adjacent battery cells along the gravity direction Z in the same battery cell group 30 are oriented oppositely along the first direction X, the probability of the ejected material from the pressure relief component 3 contaminating or damaging the pressure relief components 3 of adjacent battery cells along the gravity direction Z can be reduced. Since the pressure relief components 3 of each battery cell in the same layer are oriented in the first direction X, the ejected material from the pressure relief component 3 will hardly contaminate or damage the pressure relief components 3 of the opposite battery cell. Thus, the risk of thermal runaway along the gravity direction Z and the risk of thermal runaway along the first direction X can be reduced simultaneously.

[0290] 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 their respective pressure relief components 3 face the same direction (not shown).

[0291] It should be noted that for the first battery cell group 301 and the second battery cell group 302 that face the same direction, pressure relief spaces (pressure relief channels) can be provided to accommodate the discharge of the pressure relief component 3.

[0292] Therefore, since the pressure relief components 3 of each battery cell face the same direction, the ejected material when the pressure relief component 3 is depressurized will hardly contaminate or damage the pressure relief component 3 of the battery cell on the opposite side along the first direction X, which can reduce the risk of thermal diffusion along the first direction X when the battery cell is thermally runaway; moreover, it facilitates the manufacturing and assembly of battery cells and helps to improve the assembly efficiency of the battery device.

[0293] In some embodiments, as shown in FIG14, the plurality of battery cell groups 30 further includes a third battery cell group 303. Referring to FIG11 and FIG12, the pressure relief component 3 of each battery cell in the third battery cell group 303 is oriented in the same direction X as the pressure relief component 3 of each battery cell in the first battery cell group 301 along the first direction X. Furthermore, along the first direction X, the second battery cell group 302 is located between the first battery cell group 301 and the third battery cell group 303.

[0294] In a specific embodiment, illustrated by the orientation shown in Figures 11 and 14, the first battery cell group 301, the second battery cell group 302, and the third battery cell group 303 are arranged along a first direction X. The pressure relief component 3 of each battery cell in the third battery cell group 303 faces the same direction along the first direction X as the pressure relief component 3 of each battery cell in the first battery cell group 301. For example, the pressure relief component 3 of each battery cell faces the right side of its battery cell group, while the pressure relief component 3 of each battery cell in the second battery cell group 302 faces the left side of its battery cell group. The second housing wall of the second battery cell group 302 facing the third battery cell group 303 and the second housing wall of the third battery cell group 303 facing the second battery cell group 302 can be close to or in contact with each other.

[0295] 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.

[0296] In some embodiments, as shown in FIG17, 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 stacked along the gravitational direction Z. The plurality of battery cell groups 30 includes 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 component 3 of each battery cell in the third battery cell group 303 is oriented in the first direction X away from the second battery cell group 302, and the pressure relief component 3 of each battery cell in the second battery cell group 302 is oriented in the first direction X 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 may 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.

[0297] 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, the arrangement in Figure 14 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).

[0298] In some embodiments, as shown in FIG16, 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. 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. 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.

[0299] 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.

[0300] In some embodiments, exemplified by the orientation shown in FIG16, the first housing wall 11 may be located on the upper side of the outer casing 1, and the fourth housing wall 14 may be located on the lower side of the outer casing 1. As shown in FIG16, in the fifth battery cell group 305, in the same battery cell group, in two adjacent battery cells along the gravity direction Z, the first housing wall 11 of the lower battery cell abuts against the fourth housing wall 14 of the upper battery cell. That is, in the fifth battery cell group 305, the battery cells 10 are stacked upright.

[0301] In some embodiments, exemplified by the orientation shown in FIG16, the first housing wall 11 may be located on the lower side of the outer casing 1, and the fourth housing wall 14 may be located on the upper side of the outer casing 1. As shown in FIG16, in the sixth battery cell group 306, in the same battery cell group, in two adjacent battery cells along the gravity direction Z, the first housing wall 11 of the upper battery cell abuts against the fourth housing wall 14 of the lower battery cell. That is, in the sixth battery cell group 306, the battery cells 10 are stacked upside down.

[0302] Each battery cell group in the battery device can be either the fifth battery cell group 305 or the sixth battery cell group 306. Alternatively, the battery device can include both the fifth and sixth battery cell groups 305 and 306. Furthermore, the upright or inverted placement of the battery cells can be combined with some or all of the aforementioned first, second, third, and fourth battery cell groups 301, 302, 303, and 304. For example, the pressure relief components 3 in adjacent battery cell groups can be staggered by stacking the battery cells 10 in an upright or inverted manner.

[0303] Therefore, battery cells can be stacked with the first housing wall 11 (electrode terminal) facing upwards, or with the first housing wall 11 (electrode terminal) facing downwards, or a mixture of both stacking directions can be arranged. This not only improves the flexibility of battery cell orientation arrangement, but also allows the pressure relief components 3 to be easily staggered by changing the orientation of the battery cells. This eliminates the need to prepare two types of battery cells with different positions of the pressure relief components 3, which helps to simplify the battery cell manufacturing process, improve production efficiency, and reduce production costs.

[0304] In some embodiments, as shown in Figures 11 to 15 or Figure 17, the first housing wall 11 of each battery cell 10 is located on the same side of the outer casing 1 along the direction of gravity Z (e.g., the upper or lower side shown in Figure 11). That is, all battery cells 10 are either upright or inverted.

[0305] Therefore, all the battery cells can be arranged in the same orientation along the direction of gravity Z, which helps to simplify the assembly process.

[0306] In some embodiments, as shown in FIG16, the plurality of battery cell groups include a fifth battery cell group 305 and a sixth battery cell group 306. In the fifth battery cell group 305, the first housing wall 11 of each battery cell 10 is located on the first side of the outer casing 1 along the gravity direction Z, and the fourth housing wall 14 is located on the second side of the outer casing 1 along the gravity direction Z. In the sixth battery cell group 306, the first housing wall 11 of each battery cell 10 is located on the second side of the outer casing 1 along the gravity direction Z, and the fourth housing wall 14 is located on the first side of the outer casing 1 along the gravity direction Z. That is, an embodiment of a mixture of upright stacking and inverted stacking of battery cells 10 is provided.

[0307] In a specific embodiment, illustrated in the orientation shown in FIG16, in the fifth battery cell group 305, the first housing wall 11 of each battery cell is located on the first side of the outer shell 1 along the gravity direction Z (e.g., the upper side shown in FIG16), and the fourth housing wall 14 is located on the second side of the outer shell 1 along the gravity direction Z (e.g., the lower side shown in FIG16). Thus, in the fifth battery cell group 305, the first housing wall 11 of the lower one of two adjacent battery cells along the gravity direction Z abuts against the fourth housing wall 14 of the upper one.

[0308] In a specific embodiment, illustrated in the orientation shown in FIG16, in the sixth battery cell group 306, the first housing wall 11 of each battery cell is located on the second side of the outer shell 1 along the gravity direction Z (e.g., the lower side shown in FIG16), and the fourth housing wall 14 is located on the first side of the outer shell 1 along the gravity direction Z (e.g., the upper side shown in FIG16). Thus, in the sixth battery cell group 306, the first housing wall 11 of the upper one of two adjacent battery cells along the gravity direction Z abuts against the fourth housing wall 14 of the lower one.

[0309] Of course, the first side can be the lower side of the outer shell 1, and the second side can be the upper side of the outer shell 1.

[0310] Therefore, by changing the orientation of the battery cells, the pressure relief components 3 between adjacent battery cells along the first direction X can be easily staggered, thus eliminating the need to prepare two types of battery cells with different positions of the pressure relief components 3. This helps to simplify the manufacturing process of battery cells, improve production efficiency, and reduce production costs.

[0311] In some embodiments, as shown in Figures 3, 6, and 10, in the first housing wall 11, the body portion 111 and the protrusion 112 are connected along the first direction X, and multiple battery cells form multiple battery cell groups. Each battery cell group includes multiple battery cells stacked along the gravity direction Z. The multiple battery cell groups are arranged along the second direction Y, wherein the first direction X, the second direction Y, and the gravity direction Z are perpendicular to each other.

[0312] In some embodiments, a plurality of battery cell groups 30 are arranged along a first direction X and a plurality of battery cell groups 30 are arranged along a second direction Y (not shown).

[0313] In some embodiments, the pressure relief component 3 is located on the second housing wall 12, and the third housing walls 13 of each battery cell in each battery cell group arranged along the second direction Y and adjacent to each other along the second direction Y are arranged close to each other.

[0314] Adjacent arrangement includes being arranged close to each other or being in contact with each other. Alternatively, a spacer may be sandwiched between adjacent third housing walls 13 along the second direction Y. The spacer may be, for example, a heat insulation pad, a buffer pad, a thermally conductive pad, etc.

[0315] Therefore, battery devices can include more individual battery cells, thereby improving pack efficiency, space utilization, and battery device energy.

[0316] In some embodiments, the housing 1 further includes two second housing walls 12 disposed opposite to each other along the first direction X, and at least one second housing wall 12 is provided with a pressure relief component 3, and adjacent battery cells 10 abut against each other along the second direction Y.

[0317] Since the pressure relief component 3 is located on the second housing wall 12, there is no need to leave pressure relief channels between the layers in the gravity direction Z and between the battery cells arranged in the second direction Y. This reduces the space occupied in the gravity direction Z and the second direction Y, improves space utilization, and enables the separation of electricity and gas.

[0318] In some embodiments, as shown in Figures 11 to 17, each battery cell group has a channel extending along the second direction Y on one or both sides of the first direction X, and the pressure relief port of the pressure relief component 3 faces the channel (e.g., the first channel 41 or the second channel 42 shown in Figure 13) along the first direction X and is in communication with the channel.

[0319] In some embodiments, adjacent battery cell groups are spaced 4 along the first direction X, and adjacent spaced 4 form a channel (e.g., the first channel 41 or the second channel 42 shown in FIG13) along the second direction Y, through which ejected material from a battery cell during thermal runaway can enter the channel.

[0320] In some specific embodiments, as shown in Figures 11, 12, 16 or 17, each battery cell group has a channel extending along the second direction Y on one side of the first direction X. Taking the orientation shown in Figure 11 as an example, there is a channel on the right side of the first battery cell group 301 and a channel on the left side of the second battery cell group 302.

[0321] In some specific embodiments, as shown in FIG13, there are channels extending along the second direction Y on both sides of the first direction X of each battery cell group. Taking FIG13 as an example, there are channels on the left and right sides of the first battery cell group 301.

[0322] By designing the number and location of channels and ensuring that the pressure relief ports of each battery cell face the channels, the ejected material emitted when any battery cell experiences thermal runaway can enter the channels, reducing the impact of the ejected material on neighboring battery cells and thus reducing the risk of thermal diffusion.

[0323] In some embodiments, as shown in Figures 11 and 12, a plurality of battery cell groups include 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 a second direction Y, and each first battery cell group 301 and each second battery cell group 302 are arranged opposite each other along a first direction X with a gap 4 between them. The gap 4 is connected along the second direction Y to form a first channel 41. The pressure relief component 3 of each battery cell in the first battery cell group 301 and the pressure relief component 3 of each battery cell in the second battery cell group 302 are both directed toward the first channel 41 along the first direction X and are connected to the first channel 41.

[0324] In some embodiments, a plurality of first battery cell groups 301 are arranged along a second direction Y, and a plurality of second battery cell groups 302 are arranged along a second direction Y. Along a first direction X, each first battery cell group 301 and each second battery cell group 302 are arranged at intervals relative to each other, and the intervals 4 are connected along the second direction Y to form a first channel 41. The pressure relief component 3 of each battery cell in the first battery cell group 301 is oriented toward the first channel 41 along the first direction X and is connected to the first channel 41, and the pressure relief component 3 of each battery cell in the second battery cell group 302 is oriented toward the first channel 41 along the first direction X and is connected to the first channel 41.

[0325] Therefore, the first battery cell group 301 and the second battery cell group 302 can share the first channel 41, which is beneficial to improving the space utilization rate within the battery device.

[0326] In some embodiments, as shown in Figures 11 and 14, the first channel 41 includes a first passage 411 and a second passage 412, which are separated in a first direction X by a separator 9.

[0327] In some embodiments, the first channel 41 has a separator 9 that divides the first channel 41 into a first passage 411 and a second passage 412 arranged along a first direction X. The pressure relief port of the pressure relief component 3 of the battery cell in the first battery cell group 301 is connected to the first passage 411, and the pressure relief port of the pressure relief component 3 of the battery cell in the second battery cell group 302 is connected to the second passage 412.

[0328] Therefore, the pressure relief components 3 opposite to each other along the first direction X can be reliably separated by the separator 9, thereby further reducing the risk of thermal runaway of the battery cell causing contamination or damage to the pressure relief components 3 of the battery cell on the opposite side along the first direction X, and further reducing the risk of thermal diffusion of the battery cell along the first direction X.

[0329] In some embodiments, as shown in FIG14, the distance D2 between the second housing walls 12 facing the first channel 41 along the first direction X is in the range of 14 mm to 20 mm.

[0330] By ensuring an appropriate distance between the two second shell walls 12 facing each other along the first direction X toward the first channel 41, it is possible to balance improving space utilization and reducing the risk of heat diffusion.

[0331] In some embodiments, as shown in FIG14, the distance D1 between the second housing wall 12 and the partition 9 along the first direction X toward the first channel 41 is in the range of 7mm to 10mm.

[0332] Thus, on the one hand, the pressure relief components 3 opposite to each other along the first direction X are reliably separated by the separator 9, and on the other hand, a suitable pressure relief path is left for the pressure relief components 3 on both sides of the separator 9. Therefore, it can reduce the risk of the ejected material contaminating or damaging the pressure relief components 3 of the battery cell opposite along the first direction X when the battery cell experiences thermal runaway, and also reduce the risk of local overheating caused by limited pressure relief space, which may lead to larger-scale thermal runaway and other adverse situations.

[0333] In some embodiments, as shown in Figures 14 and 17, the plurality of battery cell groups further include a plurality of third battery cell groups 303, which are arranged along a second direction Y. Along a first direction X, a second battery cell group 302 is located between a first battery cell group 301 and a third battery cell group 303. Along the first direction X, a first channel 41 is formed on the side of the second battery cell group 302 near the first battery cell group 301, and a second channel 42 is formed on the side of the third battery cell group 303 away from the second battery cell group 302. 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 directed toward the first channel 41 along the first direction X and are connected to the first channel 41. The pressure relief components 3 of each battery cell in the third battery cell group 303 are directed toward the second channel 42 along the first direction X and are connected to the second channel 42.

[0334] In a specific embodiment, as shown in Figures 14 and 17, a first battery cell group 301, a second battery cell group 302, and a third battery cell group 303 are arranged along a first direction X. 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, a 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 battery cells in the second battery cell group 302 are both facing and communicating with the first channel 41. Along the first direction X, the second battery cell group 302 and the third battery cell group 303 are arranged adjacent to each other, and a second channel 42 is located on the side of the third battery cell group 303 away from the second battery cell group 302. The pressure relief components 3 of the battery cells in the third battery cell group 303 face and communicate with the second channel 42.

[0335] This allows for increased space utilization while accommodating more battery cells, and provides a pressure relief channel for each battery cell, reducing the risk of thermal runaway.

[0336] In some embodiments, the plurality of battery cell groups 30 include a plurality of first battery cell groups 301 and a plurality of second battery cell groups 302. The channels include 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 a second direction Y. Each first battery cell group 301 and each second battery cell group 302 is arranged opposite to each other along the first direction X with a gap 4 between them. The gap 4 is connected 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 that is closer to the first battery cell group 301. The second channel 42 is located on the side of the second battery cell group 302 that is away from the first battery cell group 301. The pressure relief component 3 of each battery cell in the first battery cell group 301 faces the first channel 41 along the first direction X and is connected to the first channel 41. The pressure relief component 3 of each battery cell in the second battery cell group 302 faces the second channel 42 along the first direction X and is connected to the second channel 42.

[0337] In one specific embodiment, the first battery cell group 301 and the second battery cell group 302 are arranged at intervals along a first direction X. Along the first direction X, a first channel 41 is located between the first battery cell group 301 and the second battery cell group 302, and the pressure relief component 3 of the battery cell in the first battery cell group 301 faces the first channel 41 and communicates with the first channel 41. Along the first direction X, a second channel 42 is located on the side of the second battery cell group 302 away from the first battery cell group 301, and the pressure relief component 3 of the battery cell in the second battery cell group 302 faces the second channel 42 and communicates with the second channel 42.

[0338] 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 are respectively pressure-relieved through two pressure relief channels, the ejected material during pressure relief component 3 releases pressure will hardly contaminate or damage the pressure relief component 3 of the opposite battery cell. Therefore, the risk of thermal runaway along the first direction X can be reliably reduced.

[0339] In some embodiments, as shown in Figures 4 to 9, the battery cell 10 further includes an electrode assembly 6; the housing 1 has a receiving space, the electrode assembly 6 is housed in the receiving space, and the electrode terminals include 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 housing wall 11 opposite to the electrode assembly 6 along the gravity direction Z. In the same projection plane perpendicular to the second direction Y, the projection of the first electrode terminal plate 21 and the projection of the second electrode terminal plate 22 at least partially overlap.

[0340] Optionally, there can be two, three, or four electrode terminals, including electrode terminals with opposite polarities. When there are two electrode terminals, the polarities of the two electrode terminals can be opposite. One electrode terminal can be negative and the other positive.

[0341] Optionally, the electrode terminal plate can be a cuboid, a triangular prism, an "L" shape, or other irregular shapes. The first electrode terminal plate 21 and the second electrode terminal plate 22 can have the same or different shapes.

[0342] Within the same projection plane perpendicular to the second direction Y, the projection of the first electrode terminal plate 21 and the projection of the second electrode terminal plate 22 may partially or almost completely overlap.

[0343] It should be noted that each electrode terminal may include other components in addition to the electrode terminal plate. For example, it may also include an electrode terminal disc for connecting to the tab, and a connecting post for connecting the electrode terminal plate to the electrode terminal disc. Furthermore, an insulating element may be provided between the battery terminal and the first housing wall 11. The structure of the battery terminal can adopt existing structures, which will not be elaborated upon here.

[0344] Therefore, the first electrode terminal plate 21 and the second electrode terminal plate 22 can be arranged compactly along the first direction X, reducing the space occupied in the first direction X, thereby allowing the protrusion 112 to be designed to be larger and improving support stability; moreover, designing the protrusion 112 to be larger is beneficial to increasing the support area, thereby improving the support strength and support stiffness, and is beneficial to stacking more battery cells along the gravity direction Z.

[0345] In some embodiments, as shown in FIG6, the first electrode terminal plate 21 and the second electrode terminal plate 22 of each battery cell 10 located in the same layer along the gravity direction Z are alternately arranged along the second direction Y. The polarities of the first electrode terminal plate 21 and the second electrode terminal plate 22 are opposite. The battery device also includes a busbar 7, and adjacent first electrode terminal plates 21 and second electrode terminal plates 22 of two adjacent battery cells along the second direction Y are connected through the busbar 7.

[0346] In the battery cells located in the same layer along the direction of gravity Z, and in adjacent battery cells along the second direction Y, the polarities of the electrode terminal plates located in different battery cells and close to each other along the second direction Y are opposite, thereby facilitating the electrical connection between adjacent battery cells along the second direction Y through the busbar 7.

[0347] Therefore, it is easy to achieve electrical connection between adjacent battery cells along the second direction Y.

[0348] In some embodiments, as shown in FIG6, the first housing wall 11 is formed with a protrusion 112, which abuts against the adjacent battery cell 10 along the gravity direction Z; along the gravity direction Z, the busbar 7 does not extend beyond the protrusion 112 on the side protruding towards the protrusion 112.

[0349] Alternatively, taking the orientation shown in Figure 6 as an example, along the direction of gravity Z, towards the side of the protrusion 112, the busbar 7 can be roughly flush with the protrusion 112, or the busbar 7 can be lower than the protrusion 112.

[0350] Therefore, the size of each battery cell group along the gravity direction Z will not increase due to the installation of the busbar 7, which is beneficial to improving the volume utilization rate.

[0351] In some embodiments, as shown in Figures 3 and 10, the battery device 100 includes a plurality of battery cell layers along the gravity direction Z, and the battery cell layers are stacked along the gravity direction Z. The same battery cell layer includes a plurality of battery cells 10. The battery device 100 also includes a plurality of support plates 8, which are located between adjacent battery cell layers along the gravity direction Z. The adjacent battery cell layers abut against each other through the support plates 8.

[0352] It should be noted that Figure 10 only shows one battery cell layer. Along the direction of gravity Z, the battery cell layer can have multiple layers.

[0353] In some embodiments, the same battery cell layer includes a plurality of battery cells 10 arranged along a first direction X and / or along a second direction Y, and adjacent battery cell layers along the gravity direction Z are provided with a support plate 8, and adjacent battery cell layers abut against each other through the support plate 8.

[0354] In some embodiments, the present disclosure does not specifically limit the shape of the support plate 8. 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 thus reducing the height of the battery device.

[0355] This can disperse the pressure on the lower battery cells 10, improve the stacking stability along the gravity direction Z, increase the number of stacking layers along the gravity direction Z, and improve the volume utilization and energy of the battery device.

[0356] In some embodiments, as shown in Figures 10 to 14, 16, or 17, in the same battery cell layer, some or all of a plurality of battery cells arranged along a first direction X abut against the same support plate 8; and / or, in the same battery cell layer, some or all of a plurality of battery cells arranged along a second direction Y abut against the same support plate 8; and / or, the support plate 8 is configured such that at least its surface is insulated; and / or, along the gravity direction Z, at least one side of the battery cell is adhered to the support plate 8.

[0357] In the same battery cell layer, at least some or all of the battery cells abut against the same support plate 8. Specifically, some of the battery cells arranged along the first direction X abut against the same support plate 8, and some of the battery cells arranged along the second direction Y abut against the same support plate 8. This can disperse the pressure borne by the battery cells in the lower layer and improve the integrity of the battery cells in the same battery cell layer.

[0358] In some embodiments, the support plate 8 is configured such that at least its surface is insulated. Optionally, the support plate 8 may be made of an insulating material, such as insulating resin; or the support plate 8 may be made of steel, aluminum, titanium, or other materials, wherein the outer surface of the support plate 8 has an insulating coating.

[0359] In some embodiments, along the direction of gravity Z, at least one side of the battery cell is bonded to the support plate 8, for example, by structural adhesive.

[0360] This allows for the distribution of pressure on the lower battery cells and improves the overall integrity of the battery cells within the same battery cell layer, further enhancing the stacking stability along the gravity direction Z. Moreover, the support plate 8 has insulation properties, which helps reduce the risk of leakage.

[0361] In some embodiments, as shown in FIG3, the battery device 100 further includes a housing 20, at least one end of the support plate 8 being supported on the housing wall 201 of the housing; and / or, the battery device 100 further includes a housing 20 and a beam member (not shown) disposed in the housing, at least one end of the support plate 8 being supported on the beam member (not shown).

[0362] In some embodiments, as shown in FIG3, the battery device includes a housing 20, which may include a first housing 20A and a second housing 20B. The first housing 20A and the second housing 20B are fastened together to form a closed space inside the housing 20 for housing the battery cells. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 20A may be a top cover or a bottom plate.

[0363] In some embodiments, at least one end of the support plate 8 is supported on the box wall 201 of the box body. Further, both ends of the support plate 8 along the first direction X are supported on the box wall 201 of the box body, and both ends of the support plate 8 along the second direction Y are also supported on the box wall 201 of the box body.

[0364] In some embodiments, the housing 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, thereby forming an enclosed space inside the housing to accommodate the battery cell pack. The frame includes beam members (not shown), and at least one end of the support plate 8 is supported on the beam members. Further, both ends of the support plate 8 along the first direction X and / or the second direction Y are supported on the beam members.

[0365] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0366] Therefore, the pressure on the lower battery cells can be dispersed by the support plate 8 supported on the box wall 201 or the beam component, which can improve the stacking stability along the gravity direction Z, which is conducive to increasing the number of stacking layers along the gravity direction Z, and improving the volume utilization and energy of the battery device.

[0367] In some embodiments, as shown in Figures 3, 11 to 14, 16 and 17, the battery device 100 further includes a heat exchange plate (not shown), which is located between adjacent battery cells 10 along the second direction Y. The adjacent battery cells 10 along the second direction Y abut against each other through the heat exchange plate, and a plurality of battery cells 10 arranged along the first direction X abut against the same heat exchange plate.

[0368] 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.

[0369] 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.

[0370] In some embodiments, as shown in FIG10, 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.

[0371] Taking the orientation shown in Figure 10 as an example, 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.

[0372] 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.

[0373] 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.

[0374] In some embodiments, the support plate 8 includes thermal management components.

[0375] For example, the support plate 8 can be a liquid cooling plate.

[0376] 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 the volume utilization rate.

[0377] In some embodiments, as shown in FIG4, the housing 1 includes at least one of a steel housing, an aluminum housing, and a titanium alloy housing; and / or, in the housing 1, at least the hardness of the housing body is in the range of Vickers hardness HV10 to HV400.

[0378] 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.

[0379] In some embodiments, as shown in FIG3, the battery device 100 further includes a housing 20, a plurality of battery cells 10 forming a plurality of battery cell groups 30, each battery cell group 30 including a plurality of battery cells 10 stacked along the gravity direction Z, each battery cell group 10 being housed in the housing 20, the housing 20 having a top plate and a bottom plate opposite each other along the gravity direction Z, each battery cell group abutting against at least one of the top plate and the bottom plate.

[0380] Each battery cell 30 can abut against the top plate or the bottom plate, or it can abut against both the top plate and the bottom plate.

[0381] This improves the stacking stability of the battery cell pack 30; when each battery cell pack 30 (directly or indirectly) abuts against both the top plate and the bottom plate, the stacking stability of the battery cell pack can be further improved, and the space utilization rate can be further improved.

[0382] Secondly, this disclosure also provides an electrical device, which includes a battery device 100 provided in the first aspect of this disclosure. The battery device is used to store electrical energy and supply power to the electrical device.

[0383] Because the battery pack, as described above, can improve volume utilization and the stacked battery cells along the direction of gravity can form stable support, it is possible to reduce the space occupied by the battery pack in the electrical device, or to make full use of the battery pack installation space in the electrical device, thereby increasing the energy of the battery pack and improving the range of the electrical device.

[0384] Thirdly, this disclosure also provides an energy storage device 2000, which includes a battery device 100 provided in the first aspect of this disclosure. The battery device is used to store electrical energy and provide electrical energy.

[0385] Figure 2 is a schematic diagram of the structure of an energy storage device 2000 provided in some embodiments of this disclosure. The energy storage device 2000 includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0386] Because battery devices can improve volume utilization as described above, the volume of energy storage devices can be reduced, or the energy storage capacity of energy storage devices can be increased.

[0387] Fourthly, as shown in FIG4, this embodiment of the present disclosure also provides a battery cell 10, the battery cell 10 including: a shell 1, including a shell body 15 and a first shell wall 11 connected to the shell body 15, the first shell wall 11 being located at least one end of the shell 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 body 15, and the third direction Z being consistent with the gravity direction of the battery cell 10 in the use state.

[0388] This improves the strength and rigidity of the first housing wall 11, enabling the stacking of multiple battery cells along the gravity direction Z.

[0389] 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 housed in the receiving space, and a protrusion 112 is formed on the first housing wall 11. The protrusion 112 protrudes in a direction away from the electrode assembly 6 along the third direction Z. The electrode terminal 2 is disposed on the first housing wall 11 and is located in the first housing wall 11 at a position where the protrusion 112 is not formed.

[0390] Because the first housing wall 11 has protrusions 112, the strength and rigidity of the first housing wall 11 can be improved, thereby increasing the support stability for adjacent battery cells along the gravity direction Z, which is beneficial for stacking multiple battery cells along the gravity direction. Moreover, since the electrode terminals 2 are disposed on the first housing wall 11 and located in the first housing wall at a position where no protrusions are formed, the miniaturization of the battery cells can be improved.

[0391] In some embodiments, the wall thickness of the shell 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.

[0392] Because the shell wall of the main shell is of a suitable thickness, it is possible to balance the rigidity and volume utilization of the shell; because the first shell wall is of a suitable thickness, it is possible to balance the rigidity and strength of the first shell wall, enabling multi-layer stacking along the direction of gravity and improving volume utilization.

[0393] The following describes a specific example of an embodiment of this disclosure.

[0394] In one specific embodiment, as shown in Figures 3 to 17, the battery cells 10 are stacked inside the housing 20, with the stacking direction being the height direction of the battery cells. The pressure relief component 3 is located on the side of the battery cells 10, thereby reducing the space occupied by the battery cell group 30 along the gravity direction Z and improving the space utilization of the battery device.

[0395] In some embodiments, for a single-layer battery cell 10, the battery cell 10 can be tightly attached to the top plate of the housing 20; for a multi-layer battery cell 10, the shoulder of the first housing wall 11 of the battery cell 10 is tightly attached to the bottom of the battery cell 10 above it, so that the battery cell 10 bears the pressure and plays a role in strengthening the rigidity of the battery device.

[0396] In some embodiments, as shown in FIG4, the general middle part of the first housing wall 11 is recessed (with protrusions on both sides), and the electrode terminals are located within the groove, thereby making the highest point of the battery cell 10 the top cover portion, which can withstand a certain pressure.

[0397] In some embodiments, along the direction of gravity Z, the electrode terminal 2 does not extend beyond the protrusion 112, thereby enabling the highest point of the battery cell 10 to be the top cover portion, which can withstand a certain pressure.

[0398] In some embodiments, the battery cells are stacked along the direction of gravity Z, and the pressure relief component is located on the side of the battery cells, thereby eliminating the need for a venting gap in the height direction of the battery cells.

[0399] In some embodiments, along the first direction X, the ratio of the length L6 of the electrode assembly 6 to the distance L7 between the opposing walls of the two second housing walls 12 is greater than 90% and less than 100%; along the second direction Y, the ratio of the width of the electrode assembly 6 to the distance between the opposing walls of the two third housing walls 13 is greater than 90% and less than 100%; along the gravitational direction Z, the ratio of the height of the electrode assembly 6 to the distance between the opposing walls of the protrusion 112 in the first housing wall 11 and the fourth housing wall 14 is greater than 80% and less than 100%. Thus, the electrode assembly 6 can provide support force together with the first housing wall 11, reducing the probability of the first housing wall 11 bending and deforming, and further improving the rigidity of the entire battery device.

[0400] In some embodiments, the outer casing may be made of steel, aluminum, titanium, etc., to facilitate welding.

[0401] In some embodiments, the thickness of the shell body 15 is in the range of 0.1 mm to 0.8 mm, which can meet the rigidity requirements and improve the space utilization.

[0402] In some embodiments, the Vickers hardness of the outer shell is in the range of HV10 to 400, which satisfies the rigidity requirements and is also beneficial for the processing and forming of the outer shell. The above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure, and they should all be covered within the scope of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery device comprising at least two battery cells, Each of the aforementioned battery cells includes: The outer shell includes a shell body and a first shell wall connected to the shell body, the first shell wall being located at at least one end of the shell body along 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 body. Along the direction of gravity, at least two of the battery cells are stacked, and the first housing wall abuts against the adjacent battery cell.

2. The battery device according to claim 1, wherein, The first housing wall has a protrusion that abuts against the adjacent battery cell along the direction of gravity. Each of the battery cells further includes an electrode terminal, which is disposed on the first housing wall and located in the first housing wall at a position where the protrusion is not formed.

3. The battery device according to claim 1 or 2, wherein, The wall thickness of the shell body is in the range of 0.1 mm to 2.0 mm, and, The wall thickness of the first housing wall is in the 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 the range of 1.5 mm to 2.5 mm.

5. The battery device according to claim 3, wherein, Multiple battery cells form multiple battery cell groups, and each battery cell group includes n battery cells stacked along the direction of gravity, where n is a natural number greater than or equal to 2 and less than or equal to 10.

6. The battery device according to claim 5, wherein, n is 2, and the wall thickness of the first shell wall is in the 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 the range of 1.0 mm to 2.0 mm.

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

9. The battery device according to claim 5, wherein, 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 1.5 mm to 3.0 mm.

10. The battery device according to any one of claims 1 to 9, wherein, The battery cell also includes an electrode assembly, and the housing has a receiving space in which the electrode assembly is housed. The shell body includes two second shell walls disposed opposite each other along a first direction, the first direction being perpendicular to the direction of gravity and consistent with the length direction of the battery cell. Along the first direction, the ratio of the length of the electrode assembly to the distance between the opposing walls of the two second housing walls is greater than 90% and less than 100%.

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

12. The battery device according to claim 2, wherein, The battery cell also includes an electrode assembly, and the housing has a receiving space in which the electrode assembly is housed. The first shell wall is located at one end of the shell body along the direction of gravity. The shell body includes a fourth shell wall disposed opposite to the first shell wall along the direction of gravity. Along the direction of gravity, the ratio of the height of the electrode assembly to the distance between the protrusion in the first housing wall and the opposing wall surface of the fourth housing wall is greater than 80% and less than 100%.

13. The battery device according to any one of claims 2 to 12, wherein, The length of the first housing wall along the first direction is in the range of 120mm to 1200mm, and the first direction is perpendicular to the direction of gravity and consistent with the length direction of the battery cell.

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

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

16. The battery device according to any one of claims 13 to 15, wherein, The first housing wall has a protrusion that abuts against the adjacent battery cell along the direction of gravity. The ratio of the length of the protrusion along the first direction to the length of the first housing wall along the first direction is more than 50% and less than 98%.

17. The battery device according to any one of claims 13 to 16, wherein, The width of the first shell wall along the second direction is in the range of 12mm to 90mm, wherein the first direction, the second direction and the gravity direction are perpendicular to each other.

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

19. The battery device according to any one of claims 1 to 18, wherein, The maximum height of the battery cell along the direction of gravity is in the range of 80mm to 250mm.

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

21. The battery device according to any one of claims 1 to 20, wherein, The shell body includes two second shell walls disposed opposite each other along a first direction, the first direction being perpendicular to the direction of gravity and consistent with the length direction of the battery cell. The battery cell also includes a pressure relief component, which is disposed on at least one of the second housing walls.

22. The battery device according to claim 21, wherein, The shell body also includes two third shell walls disposed opposite each other along the second direction, wherein the area of ​​the first shell wall and the area of ​​the second shell wall are smaller than the area of ​​the third shell walls.

23. The battery device according to claim 21, wherein, Multiple battery cells form multiple battery cell groups, and each battery cell group includes multiple battery cells stacked along 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 along a first direction with a gap between them, 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 their respective pressure relief components face the gap.

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 battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group are all facing the interval.

25. The battery device according to claim 24, wherein, The pressure relief components of each battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group are offset from each other along the direction of gravity, and... Within the same projection plane perpendicular to the first direction, the projections of the pressure relief components of each battery cell in the first battery cell group do not overlap with the projections of the pressure relief components of each battery cell in the second battery cell group.

26. The battery device according to claim 24 or 25, wherein, The plurality of battery cell groups also includes a third battery cell group, wherein the pressure relief components of each battery cell in the third battery cell group are oriented in the same direction as the pressure relief components of each battery cell in the first battery cell group along 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.

27. The battery device according to claim 21, wherein, Multiple battery cells form multiple battery cell groups, and each battery cell group includes multiple battery cells stacked along the direction of gravity. The multiple battery cell groups include a second battery cell group and a third battery cell group. The second battery cell group and the third battery cell group are arranged along a first direction, and the pressure relief components of each battery cell in the third battery cell group are oriented in the first direction away from the second battery cell group, and the pressure relief components of each battery cell in the second battery cell group are oriented in the first direction away from the third battery cell group.

28. The battery device according to any one of claims 1 to 27, wherein, The first shell wall is located at one end of the shell body along the direction of gravity. The shell body includes a fourth shell wall disposed opposite to the first shell wall along the direction of gravity. Multiple battery cells form multiple battery cell groups, and each battery cell group includes multiple battery cells stacked along the direction of gravity. In the same battery cell group, the first housing wall of the lower battery cell along the direction of gravity abuts against the fourth housing wall of the upper battery cell; or... In the same battery cell group, the first housing wall of the one located above along the direction of gravity of two adjacent battery cells abuts against the fourth housing wall of the other located below.

29. The battery device according to claim 23, wherein, The plurality of battery cell groups includes a plurality of first battery cell groups and a plurality of second battery cell groups. Multiple first battery cell groups and multiple second battery cell groups are arranged along a second direction, and each first battery cell group and each second battery cell group are arranged opposite each other along a first direction with intervals between them, the intervals being connected along the second direction to form a first channel. The pressure relief components of each battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group are all oriented toward the first channel along the first direction and are connected to the first channel.

30. The battery device according to claim 29, wherein, The first channel includes a first path and a second path, which are separated in a first direction by a separator.

31. The battery device according to claim 29 or 30, wherein, The plurality of battery cell groups also include a plurality of third battery cell groups, which 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, the first channel is formed on the side of the second battery cell group closer to the first battery cell group, and a second channel is formed on the side of the third battery cell group opposite to the second battery cell group. The pressure relief components of each battery cell in the first battery cell group and the pressure relief components of each battery cell in the second battery cell group are aligned with the first channel along the first direction and are connected to the first channel. The pressure relief components of each battery cell in the third battery cell group are aligned with the second channel along the first direction and are connected to the second channel.

32. The battery device according to any one of claims 29 to 31, wherein, The battery cell also includes an electrode assembly, and the housing has a receiving space in which the electrode assembly is housed. The electrode terminals include a first electrode terminal plate and a second electrode terminal plate, which are located on the side of the first housing wall opposite to the electrode assembly along the direction of gravity. Within the same projection plane perpendicular to the second direction, the projections of the first electrode terminal plate and the second electrode terminal plate at least partially overlap.

33. The battery device according to claim 32, wherein, The first electrode terminal plates and the second electrode terminal plates of each battery cell located on the same layer along the direction of gravity are alternately arranged along the second direction, and the polarities of the first electrode terminal plates and the second electrode terminal plates are opposite. The battery device also includes a busbar. The first electrode terminal plates of two adjacent battery cells along the second direction are connected to the second electrode terminal plates via the busbar.

34. The battery device according to claim 33, wherein, The first housing wall has a protrusion that abuts against the adjacent battery cell along the direction of gravity. Along the direction of gravity, towards the side of the protrusion, the busbar does not extend beyond the protrusion.

35. The battery device according to any one of claims 1 to 34, wherein, Along the direction of gravity, the battery device includes multiple battery cell layers, which are stacked along the direction of gravity, and each battery cell layer includes multiple battery cells. The battery device also includes a plurality of support plates, which are located between adjacent battery cell layers along the direction of gravity, and the adjacent battery cell layers abut against each other through the support plates.

36. The battery device according to claim 35, wherein, In the same battery cell layer, some or all of the multiple battery cells arranged along the first direction abut against the same support plate; and / or, In the same battery cell layer, some or all of the multiple battery cells arranged along the second direction abut against the same support plate; and / or, The support plate is configured such that at least its surface is insulated; and / or, Along 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 housing, and at least one end of the support plate is supported on the housing wall of the housing; and / or, The battery device further includes a housing and a beam member disposed on the housing, with at least one end of the support plate supported on the beam member.

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

39. An electrical device comprising a battery device according to any one of claims 1 to 38, the battery device being used to store electrical energy and supply power to the electrical device.

40. An energy storage device comprising a battery device according to any one of claims 1 to 38, the battery device being used to store electrical energy and provide electrical energy.

41. A single battery cell, comprising: The outer casing includes a casing body and a first casing wall connected to the casing body. The first casing wall is located at at least one end of the casing body along a third direction. The wall thickness of the first casing wall is greater than the wall thickness of the casing wall of the casing body. The third direction is consistent with the gravity direction of the battery cell in its usage state.

42. The battery cell according to claim 41, wherein, The battery cell also includes electrode assemblies and electrode terminals, and the housing has a receiving space in which the electrode assemblies are housed. The first housing wall has a protrusion that protrudes in a direction away from the electrode assembly along the third direction; The electrode terminal is disposed on the first housing wall and located in the first housing wall at a position where the protrusion is not formed.

43. The battery cell according to claim 41 or 42, wherein, The wall thickness of the shell body is in the range of 0.1 mm to 2.0 mm, and, The wall thickness of the first housing wall is in the range of 0.8 mm to 3.0 mm.

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