Battery device and electric device

Abstract

A battery device (100), an electrical device, and a vehicle (1000) are disclosed. The battery device (100) includes a plurality of battery cell assemblies (10) arranged along a first direction (F1); a first busbar (20) and a second busbar (21) disposed on a first wall surface (10a) of the battery cell assembly (10). Both the first busbar (20) and the second busbar (21) are used to electrically connect two adjacent battery cell assemblies (10) along the first direction (F1) and are connected to the same battery cell assembly. The distance between the two furthest points of the first busbar (20) and the second busbar (21) along the second direction (F2) is less than or equal to half the dimension of the first wall surface (10a) along the second direction (F2). At least one of the first busbar (20) and the second busbar (21) includes at least two busbar segments (23), and the at least two busbar segments (23) are stacked along the third direction (F3). Adjacent two busbar segments (23) are connected to each other at least at one end in the second direction (F2). The above-described battery device (100) facilitates the centralized arrangement of the first busbar (20) and the second busbar (21) on the first wall surface (10a). The design of stacking multiple busbar segments (23) is beneficial to increasing the current carrying capacity of the busbars.

Description

A battery device and an electrical device Technical Field

[0001] This disclosure relates to the field of battery device technology, specifically to a battery device and an electrical device. Background Technology

[0002] With technological advancements, the application scenarios for new energy battery devices are becoming increasingly widespread in daily life and industrial production. For example, in the field of energy storage, battery devices are used to store electrical energy; in the automotive field, an increasing number of vehicles are powered by electricity provided by battery devices.

[0003] The battery device includes multiple battery cell components and a busbar. The busbar connects the individual battery cell components in series and parallel to enable the charging and discharging functions of the battery device.

[0004] In practical applications of battery devices, in order to improve the energy density of the battery device, it is necessary to increase the space ratio of the battery cell module within the battery device, making the internal structure of the battery device more compact. However, this results in less space available for the arrangement of busbars, which limits the current carrying capacity of the busbars.

[0005] Summary of the Invention

[0006] In view of this, the present disclosure aims to provide a battery device and power supply device that are advantageous in improving the current carrying capacity of the busbar within a limited space.

[0007] To achieve the above objectives, the technical solution of this disclosure embodiment is implemented as follows:

[0008] This disclosure provides a battery device including a plurality of battery cell assemblies arranged along a first direction, a first busbar, and a second busbar.

[0009] A first busbar and a second busbar are disposed on the first wall of a battery cell assembly. Both the first busbar and the second busbar are used to electrically connect two adjacent battery cell assemblies along a first direction. The distance between the two points on the outer contours of the first busbar and the second busbar connected to the same battery cell assembly along a second direction is less than or equal to half the dimension of the first wall along the second direction. At least one of the first busbar and the second busbar includes at least two busbar segments, and the at least two busbar segments are stacked along a third direction. At least one end of two adjacent busbar segments is connected to each other in the second direction. The first direction, the second direction, and the third direction are mutually perpendicular, and the third direction is perpendicular to the first wall.

[0010] The battery device in this embodiment, by limiting the maximum distance between the outer contours of the first and second busbars along the second direction, facilitates a concentrated and compact arrangement of the first and second busbars on the first wall surface. This also facilitates centralized monitoring and protection of the high-voltage area in the battery device formed by the electrical connections of the first and second busbars, and provides a regular space for the arrangement of battery cells and other components in the battery device, thereby improving the structural compactness of the battery device. Furthermore, the use of a multi-layer busbar stacking design on the basis of the relatively concentrated arrangement of the first and second busbars helps to increase the current-carrying area of ​​the busbars, reduce resistance, and improve their current-carrying capacity when the arrangement of each busbar in the second direction is restricted.

[0011] In some embodiments, the battery device includes a housing with housing walls that enclose an installation space. A battery cell assembly is disposed within the installation space, and a portion of the housing wall is recessed to form a receiving space. At least a portion of the first busbar and / or at least a portion of the second busbar are received within this receiving space. This improves the space utilization of the receiving space and facilitates centralized information monitoring and protection of the first and second busbars within the same area.

[0012] In some embodiments, in a projection plane perpendicular to a third direction, the projections of the first and second busbars are both completely located within the projection of the accommodating space. This allows the accommodating space to accommodate as many of the first and second busbars as possible, improving space utilization within the accommodating space. It also reduces the likelihood of interference between the casing wall and the first and second busbars during installation. Furthermore, it helps to reduce the distance between other parts of the casing wall and the areas on the first wall of the battery cell assembly where the second and first busbars are not located, resulting in a more compact battery device structure.

[0013] In some embodiments, the battery cell assembly further includes a first electrode lead and a second electrode lead, both disposed on the first wall surface. On the same battery cell assembly, the distance between the two points on the outer contours of the first electrode lead and the second electrode lead that are furthest apart along the second direction is less than or equal to half the dimension of the first wall surface along the second direction. This allows the first and second electrode leads to be arranged more centrally and compactly on the first wall surface, facilitating the formation of a larger, more regular area on other parts of the first wall surface, enabling the arrangement of other components in the battery device and improving the compactness of the battery device structure.

[0014] In some embodiments, the battery device includes a housing with housing walls that enclose an installation space. A battery cell assembly is disposed within the installation space, and a portion of the housing wall is recessed to form a receiving space. At least a portion of the first electrode lead and / or at least a portion of the second electrode lead is received within this receiving space. This arrangement allows the receiving space to be adapted to the concentrated arrangement of the first and second electrode leads, improving space utilization within the receiving space. It also allows the shape of the installation space to better adapt to the shape of the portion of the battery cell assembly other than the second electrode lead, resulting in a more regular shape of the installation space and further improving space utilization within the housing.

[0015] In some embodiments, the projection is directed along a third direction onto a projection plane perpendicular to that direction, and the projections of both the first and second electrode leads are completely within the projection range of the accommodating space. This allows the accommodating space to accommodate as many of the first and second electrode leads as possible, improving space utilization and reducing the likelihood of interference between the casing wall and the first and second electrode leads during installation. It also helps to reduce the distance between other parts of the casing wall and the areas on the first wall of the battery cell assembly where the first and second electrode leads are not located, resulting in a more compact battery device structure.

[0016] In some embodiments, a portion of the box wall protrudes along its thickness to form a convex portion, and the accommodating space is located within the convex portion. This is beneficial for ensuring that the wall thickness of each part of the box wall is the same, and for reducing the outer contour dimensions of the box body.

[0017] In some embodiments, the first busbar and the second busbar are arranged at intervals along a first direction on the same battery cell assembly. This allows for a more concentrated and compact arrangement of the first and second busbars, and facilitates the formation of a more regular space within the battery device when multiple battery cell assemblies are grouped and installed in the battery device. This allows for the arrangement of other devices such as busbars and sampling components within the battery device, thereby improving the space utilization rate within the battery device.

[0018] In some embodiments, on the same battery cell assembly, the first projection area is the projection of the first busbar along a third direction onto a projection surface perpendicular to that third direction, and the second projection area is the projection of the second busbar along a third direction onto a projection surface perpendicular to that third direction.

[0019] Projecting along a first direction onto a projection plane perpendicular to that direction, with one of the first and second projection areas completely covering the other, is advantageous in maximizing the flow-through cross-sectional dimensions of at least one of the first and second busbars to increase flow capacity, even when the dimensions of the arrangement area of ​​the first and second busbars along the second direction are limited. For example, if the material of the first busbar inherently has a higher flow-through capacity than the second busbar, the second busbar can be configured to have a larger dimension along the second direction than the first busbar, meaning the second projection area covers the first projection area. Alternatively, the projections of the first and second projection areas can completely overlap. This maximizes the flow-through cross-sectional dimensions of both the first and second busbars to increase flow capacity, even when the dimensions of the arrangement area of ​​the first and second busbars along the second direction are limited. For example, the dimensions of the first and second busbars along the second direction can be equal to the dimensions of the entire arrangement area along the second direction. Furthermore, it facilitates dimensional consistency between the first and second busbars, simplifying manufacturing.

[0020] In some embodiments, the battery cell assembly further includes a first electrode lead and a second electrode lead. On the same battery cell assembly, the first electrode lead includes a first connection portion, to which a first busbar is connected; the second electrode lead includes a second connection portion, to which a second busbar is connected; and the first and second connection portions are arranged at intervals along a first direction. This arrangement allows the area where the first busbar is electrically connected to the first connection portion to be arranged along the first direction with the area where the second busbar is electrically connected to the second connection portion. This arrangement, while maintaining the insulation distance between the two areas used to connect the first and second busbars respectively, facilitates a more concentrated and compact arrangement of the first and second busbars. In embodiments where the first and second projection areas completely overlap, the arrangement of the first and second connection portions along the first direction also helps to shorten the current path length of the first and second busbars, reducing resistance.

[0021] In some embodiments, the battery device further includes a sampling component located on the first wall surface along a second direction, on the same side of the first and second busbars. This arrangement allows for more efficient use of the regular area formed on the first wall surface by the compact arrangement of the first and second busbars, thereby improving the utilization rate of the internal space of the battery device.

[0022] In some embodiments, the battery cell assembly further includes a pressure relief mechanism located on the first wall surface. Along the second direction, the pressure relief mechanism is located on the same side of the first and second busbars. This arrangement allows for more effective utilization of the regular area formed on the first wall surface by the compact arrangement of the first and second busbars, and also allows for an increase in the size of the pressure relief mechanism to increase its permissible flow rate, further reducing the risk of battery cell assembly explosion.

[0023] In some embodiments, the maximum dimension of the first busbar along the second direction is less than or equal to one-quarter of the maximum dimension of the battery cell assembly along the second direction; the maximum dimension of the first busbar along the second direction is greater than or equal to one-eighth of the maximum dimension of the battery cell assembly along the second direction; the maximum thickness of the busbar is greater than 1 mm and less than 3 mm; and the number of busbar layers stacked on the first busbar along the third direction is greater than 2 layers and less than 5 layers. This is beneficial in meeting the current carrying capacity requirements of the first busbar while reducing the area occupied by the first busbar along the second direction on the first wall surface, thus reducing the size of the battery device and making its structure more compact. The thickness of the busbar is also beneficial in meeting the current carrying capacity requirements while reducing the size occupied by the busbar along the third direction. Furthermore, the current carrying capacity cross-sectional area of ​​the first busbar is also beneficial in meeting the current carrying capacity requirements while reducing the size occupied by the first busbar along the third direction.

[0024] In some embodiments, the maximum dimension of the first busbar along the second direction is less than or equal to one-fifth of the maximum dimension of the battery cell assembly along the second direction, the maximum dimension of the first busbar along the second direction is greater than or equal to one-sixth of the maximum dimension of the battery cell assembly along the second direction, the maximum thickness of the busbar is greater than 1 mm and less than 2 mm, and the number of busbar layers stacked on the first busbar along the third direction is 3. This is advantageous in meeting the current carrying capacity requirements of the first busbar while further reducing the area occupied by the first busbar along the second direction on the first wall surface, which helps to reduce the size of the battery device and make the structure of the battery device more compact; the thickness of the busbar further helps to reduce the size occupied by the busbar along the third direction, and at the same time, the thickness of the busbar facilitates bending, processing, and other operations; while meeting the current carrying capacity requirements of the first busbar, this number of busbar layers helps to reduce manufacturing difficulty and improve production efficiency.

[0025] In some embodiments, the maximum dimension of the battery cell assembly along the second direction is less than or equal to 350 mm, and the maximum dimension of the battery cell assembly along the second direction is greater than or equal to 250 mm. This allows the dimensions of the battery cell assembly along the second direction to be adapted to the arrangement of the first and second busbars and the stacking of the busbar segments, resulting in a more compact arrangement of the battery cell assembly, the first busbar, and the second busbar, while also ensuring that the arrangement of the first and second busbars effectively meets the current carrying capacity requirements of the battery cell assembly.

[0026] In some embodiments, the first busbar includes at least a first busbar segment and a second busbar segment, which are stacked along a third direction. The first busbar also includes a first bending portion located at one end of the first busbar along a second direction and used for bending and connecting the first busbar segment and the second busbar segment. This not only improves the current-carrying capacity of the first busbar but also simplifies the manufacturing process by directly forming the first busbar through bending, thus improving production efficiency.

[0027] In some embodiments, the battery cell assembly further includes a first electrode lead-out portion, a first busbar is welded to the first electrode lead-out portion to form a first weld portion, and the portion of the second busbar that overlaps with the projection of the first weld portion along a third direction is provided with at least one of a groove, a through hole, and a notch penetrating along a third direction. Thus, while improving the current-carrying capacity of the first busbar, the welding thickness of the first busbar to the first electrode lead-out portion can be reduced, which is beneficial to improving the efficiency of welding and fixing the first busbar and the first electrode lead-out portion, as well as improving the welding quality and the stability of fixing the electrode lead-out portion and the busbar.

[0028] In some embodiments, the first busbar further includes a third busbar, which is located on the side of the second busbar away from the first busbar along a third direction. The first busbar also includes a second bend, which is located at the other end of the first busbar along a second direction and is used to bend and connect the second busbar and the third busbar. Thus, a first busbar comprising three stacked busbars is formed by reciprocating bending, simplifying the manufacturing process and improving production efficiency.

[0029] In some embodiments, the battery cell assembly further includes a first electrode lead-out portion, a first busbar is welded to the first electrode lead-out portion to form a first weld portion, and at least one of the second and third busbars has at least one of a groove, a through hole, and a through notch extending in the third direction at a portion that coincides with the projection of the first weld portion. This helps to reduce the welding thickness required during the welding operation between the first busbar and the first electrode lead-out portion, thereby improving welding efficiency and welding quality.

[0030] In some embodiments, the portions of the second and third busbars that coincide with the projection of the first welded portion along the third direction are provided with through holes, and along the third direction, the through holes on the second busbar and the through holes on the third busbar are at least partially opposite to each other.

[0031] Alternatively, both the second and third busbars have through-holes in the portions that coincide with the projection of the first welded portion along the third direction, and the notches on the second busbar and the third busbar are at least partially opposite each other along the third direction.

[0032] In this way, when the first busbar includes three busbars, it is convenient to perform welding operations on the first welding part through the through hole or notch, which improves the efficiency of welding and fixing the first busbar and the first electrode lead-out part, and also helps to improve the welding quality and the stability of fixing the electrode lead-out part and the busbar.

[0033] In some embodiments, the distance between the two points on the outer contours of the first and second busbars connected to the same battery cell assembly that are furthest apart along the second direction is less than or equal to one-quarter of the dimension of the first wall surface along the second direction. This allows for a more compact arrangement of the first and second busbars along the second direction, improving the compactness of the internal structure of the battery device and increasing space utilization within the battery device.

[0034] In some embodiments, the battery cell assembly further includes a first electrode lead-out portion, and a first busbar is used to electrically connect the first electrode leads-out portions on two adjacent battery cell assemblies along a first direction. In a projection plane perpendicular to the first direction, the projections of the first electrode leads-out portions on the two adjacent battery cell assemblies along the first direction at least partially overlap, and the first busbar is electrically connected to the overlapping portion of the two first electrode leads-out portions. This is beneficial for reducing the size of the first busbar along the first direction, reducing its resistance; it also facilitates a more compact arrangement of the first electrode leads when multiple battery cell assemblies are grouped together; and it increases the contact area between the first busbar and the first electrode leads as it extends along the first direction, further reducing its resistance.

[0035] In some embodiments, both the first busbar and the second busbar are located on one side of the centerline of the first wall along the second direction. This facilitates the formation of a large, regular area on the first wall, allowing other components in the battery device to be arranged within this area, thus improving the space utilization rate inside the battery device.

[0036] In some embodiments, the first wall surface includes a first edge and a second edge opposite each other along a second direction. The maximum distance from the first edge to the first edge of the first busbar and the second busbar that is farther away from the first edge is less than one-quarter of the maximum distance between the first edge and the second edge. This allows the first and second busbars to be offset on the first wall surface to form a large, regular area, which is more conducive to the arrangement of other components in the battery device within this area and reduces the probability of interference with the arrangement of the first and second busbars, thus improving the space utilization of the battery device.

[0037] In some embodiments, the battery cell assembly further includes a first electrode lead-out portion and a second electrode lead-out portion. The first electrode lead-out portion includes a first connecting portion and a first extension portion. The first connecting portion is used to connect to a first busbar. The first extension portion is located at the end of the first connecting portion away from the second electrode lead-out portion along a second direction. The first extension portion protrudes from the first connecting portion along a first direction and is used to electrically connect to a first tab inside the battery cell assembly. By dividing the first electrode lead-out portion into a first connecting portion and a first extension portion, it is advantageous to extend the first connecting portion electrically connected to the first busbar along the second direction to reduce resistance. At the same time, it is advantageous to extend the first extension portion electrically connected to the second tab along the first direction to improve the stability of electrical conduction between the first electrode lead-out portion and the first tab, and / or;

[0038] The second electrode lead-out portion includes a second connecting portion and a second extension portion. The second connecting portion is used to connect to the second busbar. The second extension portion is located at the end of the second connecting portion away from the first electrode lead-out portion along a second direction. The second extension portion protrudes from the second connecting portion along a first direction and is used to electrically connect to the second tab inside the battery cell assembly. By dividing the second electrode lead-out portion into a second connecting portion and a second extension portion, it is advantageous to extend the second connecting portion, which is electrically connected to the second busbar, along the second direction to reduce resistance. At the same time, it is advantageous to extend the second extension portion, which is electrically connected to the second tab, along the second direction to improve the stability of electrical conduction between the second electrode lead-out portion and the second tab.

[0039] This disclosure also provides an electrical device, which includes a battery device as described in any of the foregoing embodiments, and the battery device serves as the power source for the electrical device. This allows for a more compact arrangement of other components within the electrical device through the compact structure of the battery device, thereby improving space utilization.

[0040] In some embodiments, the electrical device can be a vehicle, which also includes a frame. In the aforementioned embodiments, the battery device is mounted on the frame and includes a casing wall that encloses an installation space. A single battery cell assembly is disposed within the installation space. A portion of the casing wall is recessed to form a receiving space, where at least a portion of a first busbar and / or at least a portion of a second busbar is received. A portion of the casing wall protrudes along its thickness to form a convex portion, within which the receiving space is located. A recess is provided in the frame, and at least a portion of the convex portion extends into the recess. Thus, through the cooperation of the recess and the convex portion, a portion of the battery device can utilize the space of the frame, thereby improving space utilization and increasing the battery capacity in the vehicle.

[0041] In some embodiments, the protrusion extends along a third direction, and the frame includes a mounting beam disposed on one side of the battery device along the third direction. The mounting beam has a slot, which opens along the third direction towards the battery device to form an opening. At least a portion of the protrusion extends into the slot through the opening. This improves the utilization of the internal space of the mounting beam, which is beneficial for increasing the battery capacity in the vehicle. The protrusion can enter the slot through the opening simply by moving the frame along the third direction, simplifying the assembly process.

[0042] In some embodiments, the box wall with protrusions is configured as the passenger compartment floor of the vehicle, with the protrusions facing the passenger compartment. This facilitates the utilization of redundant space within the passenger compartment, improving the space utilization rate inside the vehicle and increasing the vehicle's capacity.

[0043] In some embodiments, the vehicle further includes a mounting beam disposed along a third direction on the passenger compartment floor opposite to the battery device. The mounting beam has a slot, which opens along a third direction towards the passenger compartment floor to form an opening. At least a portion of the protrusion extends into the slot through the opening. In this way, by utilizing the space within the slot, it is beneficial to increase the space of the recess, thereby increasing the volume of the battery device in the redundant space within the passenger compartment and improving the space utilization rate inside the vehicle. Attached Figure Description

[0044] Figure 1 is a schematic diagram of an embodiment of the present disclosure in which the electrical device is a vehicle;

[0045] Figure 2 is an exploded schematic diagram of a battery device according to an embodiment of the present disclosure;

[0046] Figure 3 is a schematic diagram of the battery device in the first embodiment of this disclosure;

[0047] Figure 4 is a partial cross-sectional schematic diagram of the battery device in the embodiment of Figure 3;

[0048] Figure 5 is a magnified view of a portion of position B in Figure 4;

[0049] Figure 6 is a schematic diagram of the arrangement of the battery cell assembly, the first busbar, and the second busbar in Figure 4;

[0050] Figure 7 is a schematic diagram of the battery cell assembly in Figure 6;

[0051] Figure 8 is a partial cross-sectional view of the battery device in the second embodiment of this disclosure, wherein the cross-section is located at position AA in Figure 3;

[0052] Figure 9 is a schematic diagram of a battery cell assembly in the third embodiment of this disclosure;

[0053] Figure 10 is a schematic diagram of a battery cell assembly in the fourth embodiment of this disclosure;

[0054] Figure 11 is a schematic diagram of a battery cell assembly in the fifth embodiment of this disclosure;

[0055] Figure 12 is a schematic diagram of the battery cell assembly, the first busbar, the second busbar, and the sampling assembly in the sixth embodiment of this disclosure;

[0056] Figure 13 is a schematic diagram of the battery cell assembly in the embodiment of Figure 12;

[0057] Figure 14 is a schematic diagram of the first busbar in the seventh embodiment of this disclosure;

[0058] Figure 15 is a schematic diagram of the first busbar in Figure 14 from another perspective;

[0059] Figure 16 is a schematic diagram of the first busbar in Figure 14 in its unbent state;

[0060] Figure 17 is a schematic diagram of the first busbar in the eighth embodiment of this disclosure;

[0061] Figure 18 is a schematic diagram of the first busbar in Figure 17 from another perspective;

[0062] Figure 19 is a schematic diagram of the first busbar in Figure 17 in its unbent state;

[0063] Figure 20 is a schematic diagram of the battery cell assembly, the first busbar and the second busbar in the ninth embodiment of this disclosure, wherein the center line is the center line of the first wall surface along the second direction;

[0064] Figure 21 is a schematic diagram of the battery cell assembly, the first busbar, the second busbar, and the sampling assembly in the tenth embodiment of this disclosure;

[0065] Figure 22 is a magnified view of a portion of position C in Figure 21;

[0066] Figure 23 is a schematic diagram of the battery cell assembly in Figure 21;

[0067] Figure 24 is a cross-sectional view of the DD position in Figure 23;

[0068] Figure 25 is a magnified view of a portion of position E in Figure 24;

[0069] Figure 26 is a cross-sectional schematic diagram of the vehicle in the eleventh embodiment of this disclosure;

[0070] Figure 27 is a magnified view of a portion of position F in Figure 26;

[0071] Figure 28 is a cross-sectional schematic diagram of the vehicle in the twelfth embodiment of this disclosure;

[0072] Figure 29 is a magnified view of the part at position G in Figure 28. Detailed Implementation

[0073] 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.

[0074] Unless otherwise defined, all technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used in this disclosure 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 this disclosure are intended to cover non-exclusive inclusion.

[0075] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" 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 the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0076] In this disclosure, the reference to "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 in this disclosure can be combined with other embodiments.

[0077] In the description of the embodiments 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 disclosure generally indicates that the preceding and following related objects are in an "or" relationship.

[0078] In the description of the embodiments of this disclosure, for ease of explanation, as shown by the arrows in Figures 4, 6, 12, 13, and 21, the direction of arrow F1 is the first direction; as shown by the arrows in Figures 4, 6, 12, and 21, the direction of arrow F2 is the second direction; and as shown by the arrows in Figures 4, 8, 15, 17, 26, and 28, the direction of arrow F3 is the third direction.

[0079] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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 the embodiments of this disclosure according to the specific circumstances.

[0080] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0081] Currently, battery devices are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As the application areas of battery devices continue to expand, the market demand is also constantly increasing.

[0082] The battery cell involved in this disclosure embodiment may include an electrode assembly and an electrolyte. The electrode assembly may consist of a positive electrode, a negative electrode, and a separator. This type of battery cell can operate by relying on the movement of metal ions between the positive and negative electrode. The positive electrode may include a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the current collector without the positive active material layer protrudes from the current collector coated with the positive active material layer. The current collectors without the positive active material layer are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector may be aluminum, and the positive active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode may include a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the current collector without the negative active material layer protrudes from the current collector coated with the negative active material layer. The current collectors without the negative active material layer are stacked together to form the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure. Additionally, the battery cell involved in the embodiments of this disclosure can also be a solid-state battery cell.

[0083] A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0084] 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.

[0085] The battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments disclosed herein.

[0086] Emissions from individual battery cells mentioned in this disclosure include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0087] 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 one or more battery cells. When a battery cell assembly is formed from multiple battery cells, the multiple battery cells can be connected in series, parallel, or mixed connections via a busbar. When a battery cell assembly includes only one battery cell, the corresponding supply voltage and capacity can be formed within the battery apparatus by connecting multiple battery cell assemblies in series, parallel, or mixed connections.

[0088] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; 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 a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0089] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0090] 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.

[0091] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0092] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0093] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0094] 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.

[0095] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0096] Figure 2 is an exploded perspective view of the battery device 100 provided in an embodiment of this disclosure. As shown in Figure 2, the battery device 100 includes a housing 30 and at least one battery cell assembly 10.

[0097] The housing 30 includes a top cover 32 and a bottom plate 33. The top cover 32 covers the bottom plate 33, thereby creating an installation space between the bottom plate 33 and the top cover 32 for placing the battery cell assembly 10.

[0098] The technical solutions described in this disclosure are applicable to various electrical devices that use battery cells and battery devices 100, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0099] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this disclosure. The description is as follows, in conjunction with the accompanying drawings.

[0100] Figure 1 is a structural schematic diagram of a vehicle 1000 provided in an embodiment 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.

[0101] 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.

[0102] The embodiments of this disclosure will now be described in detail.

[0103] In related technologies, battery devices include a busbar and multiple battery cell assemblies. The busbar electrically connects two battery cell assemblies to achieve series and parallel electrical connections between the battery cell assemblies.

[0104] When the various busbars connected to the individual battery cells are distributed dispersedly, it hinders the arrangement of other components in the battery device. Furthermore, since the busbars are used for electrical connections, they require electrical protection, leading to larger protective devices to protect all busbars simultaneously, increasing material costs and complicating assembly. Conversely, providing separate protective devices for each busbar results in an excessive number of devices, increasing costs and hindering assembly speed. Concentrating the busbars in a concentrated manner, however, results in limited space, potentially causing insufficient current-carrying width and affecting their internal resistance, thus reducing their current-carrying capacity.

[0105] To address the aforementioned issues, this disclosure provides a battery device comprising multiple battery cell assemblies arranged along a first direction F1, a first busbar, and a second busbar. Both the first and second busbars are electrically connected to the same battery cell assembly and to other battery cell assemblies respectively. Both the first and second busbars are located on the same wall surface of the battery cell assemblies. The distance between the two furthest points of the first and second busbars along the second direction F2 is less than or equal to half the dimension of the first wall surface along the second direction F2. One of the first and second busbars includes multiple stacked busbar segments, with the first direction F1, the second direction F2, and the stacking direction perpendicular to each other. This arrangement concentrates the connection points of the first and second busbars on the battery cell assemblies, while increasing the current-carrying capacity of the busbars through multiple busbar segments.

[0106] Specifically, referring to Figures 3 to 6, the battery device 100 includes a battery cell assembly 10, a first busbar 20, and a second busbar 21.

[0107] Multiple battery cell assemblies 10 are arranged along a first direction F1; a first busbar 20 and a second busbar 21 are both disposed on the first wall surface 10a of the battery cell assembly 10, and the first busbar 20 and the second busbar 21 are both used to electrically connect two adjacent battery cell assemblies 10 along the first direction F1; wherein, for the first busbar 20 and the second busbar 21 connected to the same battery cell assembly 10, the distance between the two points on their outer contours that are furthest apart along the second direction F2 is less than or equal to half the dimension of the first wall surface 10a along the second direction F2, at least one of the first busbar 20 and the second busbar 21 includes at least two busbar segments 23 and at least two busbar segments 23 are stacked along a third direction F3, and two adjacent busbar segments 23 are connected to each other at least one end in the second direction F2; the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other, and the third direction F3 is perpendicular to the first wall surface 10a.

[0108] The battery cell assembly 10 can refer to a single battery cell or a unit formed by connecting multiple battery cells in series or parallel.

[0109] A battery cell is the smallest component in the battery device 100 that can perform charging and discharging functions through electrochemical reactions.

[0110] The term "wall" refers to the outer surfaces that form the battery cell module 10. It is understood that the battery cell module 10 may have one or more walls.

[0111] The first wall 10a is the wall in which the first busbar 20 and the second busbar 21 are provided in each wall of the battery cell assembly 10.

[0112] The first busbar 20 and the second busbar 21 are electrically connected to adjacent battery cell assemblies 10 along the first direction F1, so as to realize the electrical connection between each battery cell assembly 10 through the first busbar 20 and the second busbar 21.

[0113] It should be noted that the first busbar 20 and the second busbar 21 refer to two of the at least two busbars electrically connected to the battery cell assembly 10. The first busbar 20 and the second busbar 21 may have the same shape and size or they may be different.

[0114] Referring to Figures 6, 9 to 12, 20, and 21, the distance between the two furthest points of the first busbar 20 and the second busbar 21 connected to the same battery cell assembly 10 along the second direction F2 is L1, and the dimension of the first wall surface 10a along the second direction F2 is L2, i.e., L1 ≤ L2. This makes the arrangement of the first busbar 20 and the second busbar 21 on the first wall surface 10a along the second direction F2 more compact, so as to form a larger complete area on the first wall surface 10a for the arrangement of other components in the battery device 100, thereby improving the compactness of the internal structure of the battery device 100.

[0115] At least one of the first bus 20 and the second bus 21 includes at least two bus segments 23. It is possible that only the first bus 20 includes two or more bus segments 23, or only the second bus 21 includes two or more bus segments 23; or both the first bus 20 and the second bus 21 include two or more bus segments 23.

[0116] Adjacent busbars 23 are connected to each other, enabling electrical conduction between each busbar 23.

[0117] Each busbar 23 is stacked along the third direction F3, which helps to reduce the size of at least one of the first busbar 20 and the second busbar 21 along the second direction F2 and the first direction F1.

[0118] It is understood that both the first busbar 20 and the second busbar 21 are electrically connected to the battery cell assembly 10 along the first direction F1, and the conductive paths formed by the first busbar 20 and the second busbar 21 are both conducted along the first direction F1. Therefore, the busbar 23 is stacked along the third direction F3, and the third direction F3 is perpendicular to the first direction F1. This helps to increase the cross-sectional area of ​​at least one of the first busbar 20 and the second busbar 21 perpendicular to the conductive path direction, thereby reducing resistance and improving current carrying capacity.

[0119] In this embodiment of the battery device 100, by limiting the maximum distance between the outer contours of the first busbar 20 and the second busbar 21 along the second direction F2, it is beneficial to achieve a concentrated and compact arrangement of the first busbar 20 and the second busbar 21 on the first wall surface 10a. This facilitates centralized monitoring and protection of the high-voltage area in the battery device 100 formed by the electrical connection of the first busbar 20 and the second busbar 21, and also provides a regular space for the arrangement of the battery cell assembly 10 and other components in the battery device 100, thereby improving the structural compactness of the battery device 100. Furthermore, by adopting a multi-layer busbar stacking design on the basis of the relatively concentrated arrangement of the first busbar 20 and the second busbar 21, it is beneficial to increase the current-carrying area of ​​the busbars, reduce resistance, and improve their current-carrying capacity when the arrangement of each busbar in the second direction F2 is restricted.

[0120] It is understood that in embodiments where both the first busbar 20 and the second busbar 21 include busbar segments 23, the number of busbar segments 23 included in the first busbar 20 and the number of busbar segments 23 included in the second busbar 21 may be the same or different.

[0121] In some embodiments, referring to Figures 3 to 5 and Figure 8, the battery device 100 includes a housing 30, the housing 30 includes a housing wall 31, the housing wall 31 surrounds and forms an installation space 30a, the battery cell assembly 10 is disposed in the installation space 30a, a portion of the housing wall 31 is recessed to form a receiving space 31a, at least a portion of the first busbar 20 is received in the receiving space 31a.

[0122] The housing 30 is used to provide a placement position for components such as the battery cell assembly 10, the first busbar 20, and the second busbar 21, and to provide protection.

[0123] The box wall 31 refers to the structure that forms the outer surface of the box body 30. It can be understood that the top cover 32 and the bottom plate 33 each form one or more box walls 31.

[0124] A portion of the box wall 31 is recessed in a direction away from the installation space 30a to form a receiving space 31a, which is connected to the installation space 30a.

[0125] This helps to reduce the distance between other parts of the casing wall 31 and the area on the first wall surface 10a of the battery cell assembly 10 where the first busbar 20 is not arranged, which helps to improve the space utilization rate within the battery device 100.

[0126] In some embodiments, referring to Figures 3 to 5 and Figure 8, the battery device 100 includes a housing 30, the housing 30 includes a housing wall 31, the housing wall 31 surrounds and forms an installation space 30a, the battery cell assembly 10 is disposed in the installation space 30a, a portion of the housing wall 31 is recessed to form a receiving space 31a, at least a portion of the second busbar 21 is received in the receiving space 31a.

[0127] This helps to reduce the distance between other parts of the casing wall 31 and the area on the first wall 10a of the battery cell assembly 10 where the second busbar 21 is not arranged, which helps to improve the space utilization rate within the battery device 100.

[0128] In some embodiments that include a housing 30, a housing wall 31, an installation space 30a, and a receiving space 31a, referring to Figures 3 to 5 and Figure 8, at least a portion of the second busbar 21 and at least a portion of the first busbar 20 are both received in the receiving space 31a.

[0129] This is beneficial to improving the space utilization of the accommodating space 31a, and also facilitates centralized information monitoring and protection of the first busbar 20 and the second busbar 21 within the same area.

[0130] In some embodiments, referring to FIG8, in a projection plane perpendicular to the third direction F3, the projections of the first busbar 20 and the second busbar 21 are both completely located within the projection of the accommodating space 31a.

[0131] This allows the housing space 31a to accommodate as much of the first busbar 20 and the second busbar 21 as possible, improving the space utilization rate within the housing space 31a. It also reduces the probability of interference between the housing wall 31 and the first busbar 20 and the second busbar 21 during installation. Furthermore, it helps to reduce the distance between other parts of the housing wall 31 and the area on the first wall surface 10a of the battery cell assembly 10 where the second busbar 21 and the first busbar 20 are not arranged, making the battery device 100 structure more compact.

[0132] The battery cell assembly 10 is provided with an electrode lead-out portion, which can be used to electrically connect with the first busbar 20 or the second busbar 21 so that current can be conducted between the battery cell assembly 10 and the busbar.

[0133] It is understandable that the arrangement of the electrode leads directly affects the arrangement of the first busbar 20 and the second busbar 21 electrically connected to them. In some embodiments, referring to FIG7, the battery cell assembly 10 also includes a first electrode lead 11 and a second electrode lead 12 both disposed on the first wall surface 10a. On the same battery cell assembly 10, the distance between the two points on the outer contour of the first electrode lead 11 and the outer contour of the second electrode lead 12 that are furthest apart along the second direction F2 is less than or equal to half the dimension of the first wall surface 10a along the second direction F2.

[0134] The first electrode lead-out portion 11 and the second electrode lead-out portion 12 are both located on the first wall surface 10a, so that the busbars that are electrically connected to both are also located on the first wall surface 10a.

[0135] The distance between the two points of the first electrode lead-out portion 11 and the second electrode lead-out portion 12 that are furthest apart along the second direction F2 is L3, where L3 ≤ 0.5 * L2.

[0136] This allows the first electrode lead-out portion 11 and the second electrode lead-out portion 12 to be arranged more centrally and compactly on the first wall surface 10a, which is beneficial for forming a larger regular area in other parts of the first wall surface 10a, so that other components in the battery device 100 can be arranged, thereby improving the compactness of the battery device 100 structure.

[0137] In some embodiments, referring to FIG8, at least one of the first electrode lead-out portion 11 and the second electrode lead-out portion 12 protrudes from the first wall surface 10a to reduce the probability of short circuits occurring due to contact between the busbar and other parts of the battery cell assembly 10.

[0138] In some embodiments that include a housing 30, housing walls 31, mounting space 30a, and receiving space 31a, referring to FIG7, at least a portion of the first electrode lead-out portion 11 is received within the receiving space 31a. Not limited to what is shown in FIG7, in other embodiments, a portion of the first electrode lead-out portion 11 may be located outside the receiving space 31a.

[0139] This allows the shape of the installation space 30a to better adapt to the shape of the portion outside the first electrode lead-out portion 11 on the battery cell assembly 10, making the shape of the installation space 30a more regular and improving the space utilization rate inside the housing 30.

[0140] In some embodiments that include a housing 30, housing walls 31, mounting space 30a, and receiving space 31a, referring to FIG8, at least a portion of the second electrode lead-out portion 12 is received within the receiving space 31a. Not limited to what is shown in FIG8, in other embodiments, a portion of the second electrode lead-out portion 12 may be located outside the receiving space 31a.

[0141] This allows the shape of the installation space 30a to better adapt to the shape of the portion outside the second electrode lead-out portion 12 on the battery cell assembly 10, makes the shape of the installation space 30a more regular, and improves the space utilization rate inside the housing 30.

[0142] In some embodiments comprising a housing 30, housing walls 31, mounting space 30a, and receiving space 31a, referring to FIG8, at least a portion of the first electrode lead-out portion 11 and at least a portion of the second electrode lead-out portion 12 are both received within the receiving space 31a. Not limited to what is shown in FIG8, in other embodiments, portions of both the first electrode lead-out portion 11 and the second electrode lead-out portion 12 may each be located outside the receiving space 31a.

[0143] This arrangement allows the accommodating space 31a to be adapted to the concentrated arrangement of the first electrode lead-out portion 11 and the second electrode lead-out portion 12, thereby improving the space utilization rate within the accommodating space 31a. It also allows the spatial shape of the mounting space 30a to better adapt to the shape of the portion outside the second electrode lead-out portion 12 on the battery cell assembly 10, making the shape of the mounting space 30a more regular and improving the space utilization rate within the housing 30.

[0144] In some embodiments, referring to FIG8, the projection along the third direction F3 onto a projection plane perpendicular to the third direction F3, the projections of the first electrode lead-out portion 11 and the second electrode lead-out portion 12 are both completely located within the projection range of the accommodating space 31a. Not limited to the arrangement of the busbar as shown in FIG6 as in FIG8, in other embodiments, as shown in FIG9 to 12, 20, and 21, the projection along the third direction F3 onto a projection plane perpendicular to the third direction F3 can all be configured such that the projections of the first electrode lead-out portion 11 and the second electrode lead-out portion 12 are completely located within the projection range of the accommodating space 31a.

[0145] This allows the accommodating space 31a to accommodate as many first electrode leads 11 and second electrode leads 12 as possible, improving the space utilization rate within the accommodating space 31a. It also reduces the probability of interference between the casing wall 31 and the first electrode leads 11 and the second electrode leads 12 during installation. Furthermore, it helps to reduce the distance between other parts of the casing wall 31 and the area on the first wall surface 10a of the battery cell assembly 10 where the first electrode leads 11 and the second electrode leads 12 are not located, making the battery device 100 structure more compact.

[0146] In some embodiments, referring to Figures 5 and 8, a portion of the box wall 31 protrudes along its wall thickness direction to form a protrusion 311, and the receiving space 31a is located in the protrusion 311.

[0147] The wall thickness of the enclosure wall 31 refers to the distance between the surface of the enclosure wall 31 facing the installation space 30a and the surface facing away from the installation space 30a. The wall thickness direction is the straight line direction in which this distance is located.

[0148] This makes it easier to ensure that the wall thickness of each part of the box wall 31 is the same, which helps to reduce the outer contour dimensions of the box body 30.

[0149] The specific manner in which a portion of the box wall 31 protrudes along its wall thickness to form a protrusion 311 is not limited. For example, a portion of the box wall 31 may be stamped using a mold to form the protrusion 311.

[0150] In some embodiments, the wall thickness direction and the protrusion direction of the protrusion 311 are the third direction F3.

[0151] In some embodiments, referring to Figures 9 to 12, 20 and 21, on the same battery cell assembly 10, the first busbar 20 and the second busbar 21 are arranged at intervals along the first direction F1.

[0152] That is, on the same battery cell, there are at least two busbars, a portion of which are arranged opposite each other along the first direction F1. The two busbars can be directly opposite each other along the first direction F1, or they can be partially opposite each other along the first direction F1.

[0153] This allows for a more concentrated and compact arrangement of the first busbar 20 and the second busbar 21. It also allows for the formation of a more regular space within the battery device 100 when the multiple battery cell modules 10 are grouped and installed in the battery device 100, so as to arrange other devices such as busbars and sampling components 40 within the battery device 100. This helps to improve the space utilization rate within the battery device 100.

[0154] It is understandable that the distance between the two points of the first busbar 20 and the second busbar 21 that are furthest apart along the second direction F2, i.e., L1, is directly related to the size of the portion of the first wall surface 10a located outside the arrangement of the first busbar 20 and the second busbar 21 that can be used to arrange other components in the battery device 100.

[0155] In some embodiments, referring to Figures 9 and 11, on the same battery cell assembly 10, the first projection area is the projection of the first busbar 20 along the third direction F3 onto a projection surface perpendicular to the third direction F3, and the second projection area is the projection of the second busbar 21 along the third direction F3 onto a projection surface perpendicular to the third direction F3, and along the first direction F1 onto a projection surface perpendicular to the first direction F1. The projection of one of the first projection area and the second projection area completely covers the other.

[0156] In other words, the projection range of one of the first projection area and the second projection area is larger than the projection range of the other, and the smaller projection range is completely inside the larger projection range. Thus, the size of one of the first busbar 20 and the second busbar 21 along the second direction F2 is larger than the size of the other along the second direction F2.

[0157] Thus, given the limited dimensions of the arrangement area of ​​the first busbar 20 and the second busbar 21 along the second direction F2, the flow cross-sectional dimensions of at least one of the first busbar 20 and the second busbar 21 are increased as much as possible to enhance the flow capacity.

[0158] For example, if the material of the first busbar 20 has a better flow capacity than the second busbar 21, the second busbar 21 can be set to have a larger dimension along the second direction than the first busbar 20, that is, the second projection area covers the first projection area.

[0159] In some embodiments, referring to Figures 9 and 11, on the same battery cell assembly 10, the first projection area is the projection of the first busbar 20 along the third direction F3 onto a projection surface perpendicular to the third direction F3, and the second projection area is the projection of the second busbar 21 along the third direction F3 onto a projection surface perpendicular to the third direction F3, and along the first direction F1 onto a projection surface perpendicular to the first direction F1. The projections in the first projection area and the second projection area completely overlap.

[0160] In other words, the first busbar 20 and the second busbar 21 have the same dimensions along the second direction F2.

[0161] Thus, given the limited dimensions of the arrangement area of ​​the first busbar 20 and the second busbar 21 along the second direction F2, the flow-through cross-sectional dimensions of both the first busbar 20 and the second busbar 21 are maximized to increase flow capacity. For example, the dimensions of the first busbar 20 and the second busbar 21 along the second direction can be equal to the dimensions of the entire arrangement area along the second direction F2. Furthermore, this facilitates dimensional consistency between the first busbar 20 and the second busbar 21, simplifying manufacturing.

[0162] The specific method by which the first busbar 20 and the second busbar 21 are arranged at intervals along the first direction F1 is not limited.

[0163] For example, referring to Figures 12 and 13, the battery cell assembly 10 further includes a first electrode lead-out portion 11 and a second electrode lead-out portion 12. On the same battery cell assembly 10, the first electrode lead-out portion 11 includes a first connection portion 111, and a first busbar 20 is connected to the first connection portion 111. The second electrode lead-out portion 12 includes a second connection portion 121, and a second busbar 21 is connected to the second connection portion 121. The first connection portion 111 and the second connection portion 121 are arranged at intervals along a first direction F1.

[0164] The first connection portion 111 refers to the portion on the first electrode lead-out portion 11 used to make an electrical connection with the first busbar 20.

[0165] The second connection part 121 refers to the part on the second electrode lead-out part 12 used to make an electrical connection with the second busbar 21.

[0166] This arrangement allows the area where the first busbar 20 is electrically connected to the first connection portion 111 to be arranged along the first direction F1 with the area where the second busbar 21 is electrically connected to the second connection portion 121. This arrangement, while maintaining the insulation distance between the two areas connecting the first busbar 20 and the second busbar 21, also allows for a more concentrated and compact arrangement of the two busbars. In embodiments where the first and second projection areas completely overlap, the arrangement of the first connection portion 111 and the second connection portion 121 along the first direction F1 further shortens the current path length of the first busbar 20 and the second busbar 21, reducing resistance.

[0167] In some embodiments, the first electrode lead-out portion 11 and the second electrode lead-out portion 12 have opposite polarities, that is, one of them is the positive electrode and the other is the negative electrode.

[0168] In some embodiments, referring to Figures 12 and 21, the battery device 100 further includes a sampling component 40 located on the first wall surface 10a along the second direction F2, and the sampling component 40 is located on the same side of the first busbar 20 and the second busbar 21.

[0169] The sampling component 40 is used to collect information such as temperature and voltage of the battery cell assembly 10 by being electrically connected to the battery cell assembly 10, and to transmit this information to the battery management system (BMS) in the battery device 100 so as to monitor the working status of the battery cell assembly 10.

[0170] The sampling component 40 is located on the first wall surface 10a, meaning that the sampling component 40 is placed on the first wall surface 10a.

[0171] The sampling component 40 is located on the same side of the first busbar 20 and the second busbar 21. Alternatively, the sampling component 40 may be located on the side of the second busbar 21 away from the first busbar 20 along the second direction F2, or the sampling component 40 may be located on the side of the first busbar 20 away from the second busbar 21 along the second direction F2.

[0172] This allows the arrangement of the sampling components 40 to more effectively utilize the regular area formed on the first wall 10a by the compact arrangement of the first busbar 20 and the second busbar 21, thereby improving the utilization rate of the internal space of the battery device 100.

[0173] In some embodiments, referring to Figures 6, 12 and 21, the battery cell assembly 10 further includes a pressure relief mechanism 13, which is located on the first wall surface 10a along the second direction F2, and is located on the same side of the first busbar 20 and the second busbar 21.

[0174] The pressure relief mechanism 13 is used to be triggered by factors such as temperature and pressure after thermal runaway occurs inside the battery cell assembly 10, so that the high temperature and high pressure gas generated inside the battery cell assembly 10 can pass through the pressure relief mechanism 13 and be discharged from the battery cell assembly 10, thereby reducing the risk of the battery cell assembly 10 exploding.

[0175] The pressure relief mechanism 13 is located on the same side of the first busbar 20 and the second busbar 21. Alternatively, the pressure relief mechanism 13 may be located on the side of the second busbar 21 away from the first busbar 20 along the second direction F2, or the pressure relief mechanism 13 may be located on the side of the first busbar 20 away from the second busbar 21 along the second direction F2.

[0176] This arrangement allows the pressure relief mechanism 13 to make more effective use of the regular area formed on the first wall surface 10a by the compact arrangement of the first busbar 20 and the second busbar 21. It also helps to increase the size of the pressure relief mechanism 13 so as to increase the allowable flow rate of the pressure relief mechanism 13, thereby further reducing the risk of explosion of the battery cell assembly 10.

[0177] The specific form of the pressure relief mechanism 13 is not limited, such as a pressure relief valve.

[0178] In some embodiments where a pressure relief mechanism 13 and a sampling component 40 are provided, referring to FIG23, the pressure relief mechanism 13 and the sampling component 40 are both located on the same side of the first busbar 20 and the second busbar 21, so as to make more effective use of the regular area formed on the first wall surface 10a by the compact arrangement of the first busbar 20 and the second busbar 21, thereby improving the space utilization of the battery device 100.

[0179] In some embodiments, the maximum size of the first busbar 20 along the second direction F2 is less than or equal to one-quarter of the maximum size of the battery cell assembly 10 along the second direction F2, and the maximum size of the first busbar 20 along the second direction F2 is greater than or equal to one-eighth of the maximum size of the battery cell assembly 10 along the second direction F2.

[0180] Referring to Figure 6, the dimension of the first busbar 20 along the second direction F2 is L4, and 0.125*L2≤L4≤0.25*L2.

[0181] This is beneficial to meet the current carrying capacity requirements of the first busbar 20 while reducing the area occupied by the first busbar 20 along the second direction F2 on the first wall surface 10a, which helps to reduce the size of the battery device 100 and make the structure of the battery device 100 more compact.

[0182] Furthermore, in some embodiments, the maximum size of the first busbar 20 along the second direction F2 is less than or equal to one-fifth of the maximum size of the battery cell assembly 10 along the second direction F2, and the maximum size of the first busbar 20 along the second direction F2 is greater than or equal to one-sixth of the maximum size of the battery cell assembly 10 along the second direction F2. That is, 1 / 6*L2≤L4≤0.2*L2.

[0183] This is beneficial to meet the current carrying capacity requirements of the first busbar 20 while further reducing the area occupied by the first busbar 20 on the first wall surface 10a along the second direction F2, which is conducive to reducing the size of the battery device 100 and making the structure of the battery device 100 more compact.

[0184] The specific dimensions of the first busbar 20 along the second direction F2 are not limited, for example, 50mm (millimeters), 52mm, 54mm, 56mm, 58mm, 60mm, 62mm, 64mm, etc.

[0185] In some embodiments, the maximum thickness of the busbar 23 is greater than 1 mm and less than 3 mm. Referring to Figures 15 and 17, the maximum thickness of the busbar 23 is L5, that is, 1 mm < L5 < 3 mm.

[0186] The thickness of busbar 23 refers to the smallest dimension among the three dimensions of busbar 23.

[0187] In this way, the thickness of the busbar 23 is both conducive to meeting the requirements of current overcurrent and also conducive to reducing the size occupied by the busbar 23 along the third direction F3.

[0188] Furthermore, in some embodiments, the maximum thickness of the busbar 23 is greater than 1 mm and less than 2 mm. That is, 1 mm < L5 < 2 mm.

[0189] This makes the thickness of the busbar 23 more conducive to reducing the size occupied by the busbar 23 along the third direction F3, and at the same time, makes the thickness of the busbar 23 easier to bend, process and other operations.

[0190] The maximum thickness of the busbar 23 is not limited, for example, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm.

[0191] It is understandable that the thickness direction of the busbar 23 is the third direction F3.

[0192] In some embodiments, referring to Figures 15 and 18, the number of busbars 23 stacked on the first busbar 20 and along the third direction F3 is greater than 2 and less than 5.

[0193] This makes the current-carrying cross-sectional area of ​​the first busbar 20 suitable for meeting the current-carrying requirements, and also helps to reduce the size occupied by the first busbar 20 along the third direction F3.

[0194] Furthermore, in some embodiments, referring to FIG18, the number of layers of busbar 23 stacked on the first busbar 20 and along the third direction F3 is 3.

[0195] Thus, while meeting the current carrying capacity requirements of the first busbar 20, this layer of busbars 23 helps to reduce manufacturing difficulty and improve production efficiency.

[0196] In some embodiments, the maximum dimension of the battery cell assembly 10 along the second direction F2 is less than or equal to 350 mm, and the maximum dimension of the battery cell assembly 10 along the second direction F2 is greater than or equal to 250 mm. That is, 250 mm ≤ L2 ≤ 350 mm.

[0197] In this way, the dimensions of the battery cell assembly 10 along the second direction F2 are adapted to the arrangement of the first busbar 20 and the second busbar 21 and the stacking of the busbar 23, which makes the arrangement of the battery cell assembly 10, the first busbar 20 and the second busbar 21 more compact, and the arrangement of the first busbar 20 and the second busbar 21 is conducive to meeting the current carrying capacity requirements of the battery cell assembly 10.

[0198] The specific method for achieving electrical connection between two adjacent busbars 23 is not limited.

[0199] For example, referring to Figures 5, 14 and 15, the first busbar 20 includes at least a first busbar 231 and a second busbar 232, which are stacked along a third direction F3. The first busbar 20 also includes a first bending portion 233, which is located at one end of the first busbar 20 along a second direction F2 and is used to bend and connect the first busbar 231 and the second busbar 232.

[0200] The first busbar 231 and the second busbar 232 are two busbars 23 that are stacked adjacently along the third direction F3 among the multiple busbars 23 of the first busbar 20.

[0201] The first bending part 233 refers to the part of the blank of the first busbar 20 that is bent after bending.

[0202] The first bend 233 is located at one end of the first busbar 20 along the second direction F2, that is, the first bend 233 is located at the edge of both the first busbar 231 and the second busbar 232 along the second direction F2, so that when the current passes through the first busbar 20 along the first direction F1, the cross section of the first busbar 231 perpendicular to the first direction F1 and the cross section of the first busbar 231 perpendicular to the first direction F1 both completely form part of the cross section of the current flow path, thereby helping to increase the cross section of the current flow path.

[0203] In this way, it is beneficial to improve the flow capacity of the first busbar 20, and the first busbar 20 is formed directly by bending, which simplifies the processing technology and helps to improve production efficiency.

[0204] The specific material of the busbar 23 is not limited, such as copper, aluminum or other metals, so that the ductility of the metal can be used to bend the busbar 23.

[0205] In some embodiments, referring to Figures 4 and 5, the axial direction of the first bending portion 233 is the first direction F1, so as to enable the multiple busbars 23 to increase the cross-section of the current flow path and improve the current carrying capacity of the first busbar 20.

[0206] Understandably, the electrode leads need to be fixed to the busbar to maintain stable electrical conduction between them. The method of fixing them is not limited, such as welding.

[0207] In some embodiments, referring to Figures 5, 14 to 16, the battery cell assembly 10 further includes a first electrode lead-out portion 11, a first busbar 231 welded to the first electrode lead-out portion 11 to form a first weld portion 231a, and a second busbar 232 having at least one of a groove, a through hole 23a, and a notch extending through the third direction F3 at the portion that overlaps with the projection of the first weld portion 231a along the third direction F3.

[0208] On the first busbar 20, at least one of the following is provided along the third direction F3: groove, through hole 23a, and notch extending through the third direction F3. The size of the part of the part extending through the third direction F3 is smaller than the size of the other parts. The first welding part 231a is located in this part, so that the thickness of the part to be welded is smaller than the thickness of the other parts when it is fixed by welding. This makes it easier for heat to penetrate the first welding part 231a more quickly during the welding operation and achieve melting more quickly.

[0209] In this way, while improving the current carrying capacity of the first busbar 20, the welding thickness of the first busbar 20 to the first electrode lead-out part 11 can be reduced. This is beneficial to improving the efficiency of welding and fixing the first busbar 231 and the first electrode lead-out part 11, as well as improving the welding quality and the stability of fixing the electrode lead-out part and the busbar.

[0210] In some embodiments, the second busbar 232 is located on the side of the first busbar 231 away from the first electrode lead-out portion 11, which also helps to determine the position of the first welding portion 231a during the welding operation.

[0211] In some embodiments, referring to Figures 17 to 19, the first busbar 20 further includes a third busbar 234, which is located on the side of the second busbar 232 away from the first busbar 231 along a third direction F3. The first busbar 20 also includes a second bending portion 235, which is located at the other end of the first busbar 20 along a second direction F2 and is used to bend and connect the second busbar 232 and the third busbar 234.

[0212] The bending directions of the first bending portion 233 and the second bending portion 235 are opposite. During the manufacturing process of the first busbar 20, two different regions of the blank of the first busbar 20 are bent and deformed in opposite directions to form the first bending portion 233 and the second bending portion 235 respectively. The portion between the two bending and deformed regions forms the second busbar 232. The region on the side of one bending and deformed region away from the second busbar 232 forms the first busbar 231. The region on the side of another bending and deformed region away from the second busbar 232 forms the third busbar 234.

[0213] Thus, the first busbar 20, consisting of three stacked busbar segments 23, is formed by reciprocating bending. The processing technology is simple and conducive to improving production efficiency.

[0214] In some embodiments, referring to Figures 17 to 19, the battery cell assembly 10 further includes a first electrode lead-out portion 11, a first busbar 231 welded to the first electrode lead-out portion 11 to form a first weld portion 231a, and at least one of the second busbar 232 and the third busbar 234 having a groove, a through hole 23a, and a notch extending through the third direction F3 in a portion that overlaps with the projection of the first weld portion 231a along the third direction F3.

[0215] This helps to reduce the thickness of the welding required when the first busbar 20 is welded to the first electrode lead-out portion 11, and helps to improve welding efficiency and welding quality.

[0216] In some embodiments, referring to Figures 17 to 16, the portions of the second busbar 232 and the third busbar 234 that overlap with the projection of the first welding portion 231a along the third direction F3 are provided with through holes 23a. Along the third direction F3, the through holes 23a located on the second busbar 232 and the through holes 23a located on the third busbar 234 are at least partially opposite to each other.

[0217] The through holes 23a on the third busbar 234 and the second busbar 232 are connected to each other, so that during the welding process, the welding equipment can pass through the through holes 23a on the third busbar 234 and the second busbar 232 in sequence to directly weld the first welding part 231a.

[0218] In this way, when the first busbar 20 includes three layers of busbar pieces 23, it is convenient to perform welding operations on the first welding part 231a through the through hole 23a, thereby improving the efficiency of welding and fixing the first busbar piece 231 and the first electrode lead-out part 11, and also helping to improve the welding quality and the stability of fixing the electrode lead-out part and the busbar.

[0219] In some embodiments, referring to Figures 17 to 16, the portions of the second busbar 232 and the third busbar 234 that overlap with the projection of the first weld portion 231a along the third direction F3 are provided with through notches. Along the third direction F3, the notches on the second busbar 232 and the notches on the third busbar 234 are at least partially opposite each other.

[0220] In this way, when the first busbar 20 includes three layers of busbar pieces 23, it is convenient to perform welding operations on the first welding part 231a through the through notch, thereby improving the efficiency of welding and fixing the first busbar piece 231 and the first electrode lead-out part 11, and also helping to improve the welding quality and the stability of fixing the electrode lead-out part and the busbar.

[0221] It is understood that in embodiments where the number of stacked busbars 23 in the first busbar 20 is not less than three, two adjacent busbars 23 along the third direction F3 are connected by a bend formed by bending, and the two adjacent bends along the third direction F3 are located at opposite ends of the busbars 23 along the second direction F2. The busbar 23 closest to the first electrode lead-out portion 11 along the third direction F3 is provided with a first welding portion 231a, and each of the other busbars 23 is provided with a through hole 23a that communicates with each other along the third direction F3.

[0222] In some embodiments, referring to Figures 6, 9 to 12, and 20 to 21, the distance between the two points on the outer contours of the first busbar 20 and the second busbar 21 connected to the same battery cell assembly 10 that are furthest apart along the second direction F2 is less than or equal to one-quarter of the dimension of the first wall surface 10a along the second direction F2. That is, L1 ≤ 0.25 * L2.

[0223] This makes the arrangement of the first busbar 20 and the second busbar 21 along the second direction F2 more compact, which helps to improve the compactness of the internal structure of the battery device 100 and improve the space utilization rate within the battery device 100.

[0224] In some embodiments, referring to FIG20, the battery cell assembly 10 further includes a first electrode lead-out portion 11, and a first busbar 20 is used to electrically connect the first electrode lead-out portions 11 on two adjacent battery cell assemblies 10 along the first direction F1. In a projection plane perpendicular to the first direction F1, the projections of the first electrode lead-out portions 11 on two adjacent battery cell assemblies 10 along the first direction F1 at least partially overlap, and the first busbar 20 electrically connects the overlapping portions of the projections of the two first electrode lead-out portions 11.

[0225] The polarities of the two electrode leads electrically connected to the first busbar 20 can be the same or different.

[0226] The projections of the first electrode leads 11 on two adjacent battery cell assemblies 10 at least partially overlap, indicating that at least a portion of the two are directly opposite each other along the first direction F1, thereby minimizing the distance between them along the first direction F1.

[0227] This is beneficial for reducing the size of the first busbar 20 along the first direction F1, which is beneficial for reducing the resistance of the first busbar 20; it is beneficial for making the arrangement of each first electrode lead 11 more compact after multiple battery cell assemblies 10 are grouped together; it is beneficial for increasing the contact area between the first busbar 20 and the first electrode lead 11 when the first busbar 20 extends along the first direction F1, which is beneficial for reducing the resistance of the first busbar 20.

[0228] In some embodiments, referring to FIG20, the first busbar 20 and the second busbar 21 are both located on one side of the centerline c1 of the first wall surface 10a along the second direction F2.

[0229] The centerline c1 of the first wall 10a along the second direction F2 refers to the line formed by the points on the first wall 10a that are equidistant from the two ends of the first wall 10a along the second direction F2.

[0230] Since the first busbar 20 and the second busbar 21 are located at the center line c1 of the first wall surface 10a along the second direction F2, the areas of the first wall surface 10a located on both sides of the first busbar 20 and the second busbar 21 along the second direction F2 are of different sizes.

[0231] This makes it easier to form a large, regular area on the first wall 10a, so that other components in the battery device 100 can be arranged in this area, which helps to improve the space utilization rate inside the battery device 100.

[0232] In some embodiments, referring to FIG20, the first wall surface 10a includes a first edge 10b and a second edge 10c opposite each other along the second direction F2, and the maximum distance from the first edge 10b to the first edge 10b of the first busbar 20 and the second busbar 21 is less than one-quarter of the maximum distance between the first edge 10b and the second edge 10c.

[0233] The first edge 10b refers to the boundary of one end of the first wall 10a along the second direction F2; the second edge 10c refers to the boundary of the other end of the first wall 10a along the second direction F2.

[0234] The maximum distance from the first busbar 20 to the first edge 10b of the second busbar 21 that is farther away from the first edge 10b is L6; the maximum distance between the first edge 10b and the second edge 10c is L7; L6 < 0.25 * L7.

[0235] In this way, the first busbar 20 and the second busbar 21 are offset on the first wall surface 10a to form a large, regular area, which is more conducive to the arrangement of other components in the battery device 100 in this area and reduces the probability of interference with the arrangement of the first busbar 20 and the second busbar 21, thereby improving the space utilization of the battery device 100.

[0236] In some embodiments, referring to Figures 21, 22, 24 and 25, the battery cell assembly 10 further includes a first electrode lead-out portion 11 and a second electrode lead-out portion 12. The first electrode lead-out portion 11 includes a first connecting portion 111 and a first extension portion 112. The first connecting portion 111 is used to connect to the first busbar 20. The first extension portion 112 is located at one end of the first connecting portion 111 away from the second electrode lead-out portion 12 along the second direction F2. The first extension portion 112 protrudes from the first connecting portion 111 along the first direction F1. The first extension portion 112 is used to electrically connect to the first tab 14 inside the battery cell assembly 10.

[0237] It is understandable that the larger the size of the first electrode lead-out portion 11 along the second direction F2, the smaller the resistance to achieve electrical connection between it and the first bus 20. Conversely, the larger the size of the first electrode lead-out portion 11 along the first direction F1, the more conducive it is to achieving a stable connection between the first tab 14 and the first electrode lead-out portion 11.

[0238] Thus, by dividing the first electrode lead-out portion 11 into a first connecting portion 111 and a first extension portion 112, it is advantageous for the first connecting portion 111, which is electrically connected to the first busbar 20, to extend along the second direction F2 to reduce resistance. At the same time, it is advantageous for the first extension portion 112, which is electrically connected to the second tab 15, to extend along the first direction F1 to improve the stability of electrical conduction between the first electrode lead-out portion 11 and the first tab 14.

[0239] In some embodiments, referring to Figures 21, 22, 24 and 25, the battery cell assembly 10 further includes a second electrode lead-out portion 12. The second electrode lead-out portion 12 includes a second connecting portion 121 and a second extension portion 122. The second connecting portion 121 is used to connect to the second busbar 21. The second extension portion 122 is located at one end of the second connecting portion 121 away from the first electrode lead-out portion 11 along the second direction F2. Furthermore, the second extension portion 122 protrudes from the second connecting portion 121 along the first direction F1. The second extension portion 122 is used to electrically connect to the second tab 15 inside the battery cell assembly 10.

[0240] It is understandable that the larger the size of the second electrode lead-out portion 12 along the second direction F2, the smaller the resistance to achieve electrical connection between it and the second bus 21. The larger the size of the second electrode lead-out portion 12 along the second direction F2, the more conducive it is to achieving a stable connection between the second tab 15 and the second electrode lead-out portion 12.

[0241] Thus, by dividing the second electrode lead-out portion 12 into a second connection portion 121 and a second extension portion 122, it is advantageous for the second connection portion 121, which is electrically connected to the second busbar 21, to extend along the second direction F2 to reduce resistance. At the same time, it is advantageous for the second extension portion 122, which is electrically connected to the second tab 15, to extend along the second direction F2 to improve the stability of electrical conduction between the second electrode lead-out portion 12 and the second tab 15.

[0242] In some embodiments, referring to Figures 21 and 22, the first connecting portion 111 and the second connecting portion 121 are arranged at a relative interval along the first direction F1, and at least a portion of the first connecting portion 111 and at least a portion of the second connecting portion 121 are both located between the first extension portion 112 and the second extension portion 122.

[0243] This allows for a more concentrated and compact arrangement of the first electrode lead-out portion 11 and the second electrode lead-out portion 12.

[0244] A specific embodiment of the battery device 100 in this disclosure is as follows:

[0245] The battery device 100 includes a first busbar 20, a second busbar 21, and a plurality of battery cell assemblies 10 arranged along a first direction F1. The first busbar 20 and the second busbar 21 are disposed on the first wall surface 10a of the battery cell assembly 10. Both the first busbar 20 and the second busbar 21 are used to electrically connect two adjacent battery cell assemblies 10 along the first direction F1. The distance between the two points on the outer contours of the first busbar 20 and the second busbar 21 connected to the same battery cell assembly 10 that are furthest apart along the second direction F2 is less than or equal to the distance between the two points on the first wall surface 10a along the second direction F2. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other, and the third direction F3 is perpendicular to the first wall 10a. At least one of the first busbar 20 and the second busbar 21 includes three busbar segments 23 stacked along the third direction F3. The housing 30 includes a housing wall 31, which encloses and forms an installation space 30a. The battery cell assembly 10 is disposed in the installation space 30a. A portion of the housing wall 31 is recessed to form a receiving space 31a. At least a portion of the first busbar 20 and at least a portion of the second busbar 21 are received in the receiving space 31a. In the projection plane perpendicular to the third direction F3, the projections of the first busbar 20 and the second busbar 21 are both completely located within the projection of the receiving space 31a. The battery cell assembly 10 also includes a first electrode lead-out portion 11 and a second electrode lead-out portion 12, both disposed on the first wall surface 10a. On the same battery cell assembly 10, the distance between the two points on the outer contour of the first electrode lead-out portion 11 and the outer contour of the second electrode lead-out portion 12 that are furthest apart along the second direction F2 is less than or equal to half the dimension of the first wall surface 10a along the second direction F2. At least a portion of the first electrode lead-out portion 11 and at least a portion of the second electrode lead-out portion 12 are accommodated in the receiving space 31a. Projected along the third direction F3 onto the projection plane perpendicular to the third direction F3, the projections of the first electrode lead-out portion 11 and the second electrode lead-out portion 12 are both completely located within the projection range of the receiving space 31a. A portion of the casing wall 31 protrudes along its thickness direction to form a protrusion 311, and a receiving space 31a is located in the protrusion 311. On the same battery cell assembly 10, the first busbar 20 and the second busbar 21 are arranged at intervals along the first direction F1. On the same battery cell assembly 10, the first projection area is the projection of the first busbar 20 along the third direction F3 onto a projection plane perpendicular to the third direction F3, and the second projection area is the projection of the second busbar 21 along the third direction F3 onto a projection plane perpendicular to the third direction F3. The projections of the first projection area and the second projection area completely overlap. The battery device 100 also includes a sampling component 40 and a pressure relief mechanism 13. The sampling component 40 is located on the first wall surface 10a along the second direction F2, and the sampling component 40 is located on the same side of the first busbar 20 and the second busbar 21.The pressure relief mechanism 13 is located on the first wall surface 10a, along the second direction F2, and is on the same side of the first busbar 20 and the second busbar 21. The maximum dimension of the battery cell assembly 10 along the second direction F2 is less than or equal to 350 mm, and the maximum dimension of the battery cell assembly 10 along the second direction F2 is greater than or equal to 250 mm. The maximum dimension of the first busbar 20 along the second direction F2 is less than or equal to one-fifth of the maximum dimension of the battery cell assembly 10 along the second direction F2, and the maximum dimension of the first busbar 20 along the second direction F2 is greater than or equal to one-sixth of the maximum dimension of the battery cell assembly 10 along the second direction F2. The maximum thickness of the busbar 23 is greater than 1 mm and less than 2 mm. The number of layers of the busbar 23 stacked on the first busbar 20 along the third direction F3 is 3. The first busbar 20 includes a first busbar 231, a second busbar 232, a third busbar 234, a first bending portion 233, and a second bending portion 235. The first busbar 231, the second busbar 232, and the third busbar 234 are stacked along a third direction F3. The battery cell assembly 10 also includes a first electrode lead-out portion 11. The first busbar 231 is welded to the first electrode lead-out portion 11 to form a first weld portion 231a. The first bending portion 233 is located at one end of the first busbar 20 along a second direction F2 and is used to bend and connect the first busbar 231 and the second busbar 232. The second bending portion 235 is located at the other end of the first busbar 20 along the second direction F2 and is used to bend and connect the second busbar 232 and the third busbar 234. Both the second busbar 232 and the third busbar 234 have through holes 23a at the portions where their projections overlap with the first welding portion 231a along the third direction F3. Along the third direction F3, the through holes 23a on the second busbar 232 and the third busbar 234 are at least partially opposite to each other. The first busbar 20 is used to electrically connect the first electrode leads 11 on two adjacent battery cell assemblies 10 along the first direction F1. In a projection plane perpendicular to the first direction F1, the projections of the first electrode leads 11 on the two adjacent battery cell assemblies 10 along the first direction F1 at least partially overlap, and the first busbar 20 electrically connects the overlapping portions of the two first electrode leads 11. Both the first busbar 20 and the second busbar 21 are located on one side of the centerline c1 of the first wall surface 10a along the second direction F2. The first wall surface 10a includes a first edge 10b and a second edge 10c opposite each other along the second direction F2. The maximum distance from the first edge 10b to the first edge 10b of the first busbar 20 and the second busbar 21 is less than one-quarter of the maximum distance between the first edge 10b and the second edge 10c.The first electrode lead-out portion 11 includes a first connecting portion 111 and a first extension portion 112. The first connecting portion 111 is used to connect to the first busbar 20. The first extension portion 112 is located at one end of the first connecting portion 111 away from the second electrode lead-out portion 12 along the second direction F2. The first extension portion 112 protrudes from the first connecting portion 111 along the first direction F1. The first extension portion 112 is used to electrically connect to the first tab 14 inside the battery cell assembly 10. The second electrode lead-out portion 12 includes a second connecting portion 121 and a second extension portion 122. The second connecting portion 121 is used to connect to the second busbar 21. The second extension portion 122 is located at one end of the second connecting portion 121 away from the first electrode lead-out portion 11 along the second direction F2. The second extension portion 122 protrudes from the second connecting portion 121 along the first direction F1. The second extension portion 122 is used to electrically connect to the second tab 15 inside the battery cell assembly 10.

[0246] This disclosure also provides an electrical device, which includes the battery device 100 in any of the foregoing embodiments, and the battery device 100 serves as the power source for the electrical device.

[0247] This allows for a more compact arrangement of other components within the power supply device, thereby improving space utilization, through the compact structure of the battery device 100.

[0248] In some embodiments, the electrical device can be a vehicle 1000. Referring to Figures 26 and 27, the vehicle 1000 also includes a frame 400 and the battery device 100 in the aforementioned embodiments. The battery device 100 is disposed on the frame 400 and includes a housing wall 31. The housing wall 31 surrounds and forms an installation space 30a. The battery cell assembly 10 is disposed in the installation space 30a. A portion of the housing wall 31 is recessed to form a receiving space 31a. At least a portion of the first busbar 20 and / or at least a portion of the second busbar 21 is received in the receiving space 31a. A portion of the housing wall 31 protrudes along its wall thickness direction to form a protrusion 311. The receiving space is located in the protrusion 311. The frame 400 has a recess 400a, and at least a portion of the protrusion 311 extends into the recess 400a.

[0249] The 400 frame refers to the frame structure formed by splicing multiple beams in the vehicle 1000.

[0250] The battery unit 100 can be fixedly connected to the frame 400, or it can be detachably connected, so as to maintain and replace the battery unit 100.

[0251] Thus, through the cooperation of the recess 400a and the protrusion 311, a portion of the battery device 100 can utilize the space of the frame 400, thereby improving the space utilization of the vehicle and increasing the capacity of the battery device 100 in the vehicle 1000.

[0252] In some embodiments, referring to FIG27, the protrusion 311 protrudes along the third direction F3, and the frame 400 includes a mounting beam 410 disposed on one side of the battery device 100 along the third direction F3. The mounting beam 410 is provided with a slot 410a, which is open along the third direction F3 towards the side of the battery device 100 to form an opening. At least a portion of the protrusion 311 extends into the slot 410a through the opening.

[0253] Mounting beam 410 refers to the beam structure in the frame 400 that can be used to mount other components in the vehicle 1000, such as the beam structure used to mount seats, center console, doors, etc.

[0254] This improves the utilization of the internal space of the mounting beam 410, which is beneficial to increasing the capacity of the battery device 100 in the vehicle 1000; the frame 400 can move along the third direction F3 to allow the protrusion 311 to enter the slot 410a through the opening, simplifying the assembly steps.

[0255] Understandably, the slot 410a forms at least a portion of the recess 400a.

[0256] The specific method by which the mounting beam 410 forms the slot 410a is not limited. For example, the slot 410a can be formed on the inner side of the raised structure formed after the plate is bent multiple times.

[0257] In some embodiments, referring to Figures 26 and 27, the box wall 31 with protrusions 311 is configured as the passenger compartment floor 420 of the vehicle 1000, with the protrusions 311 facing the passenger compartment 400b.

[0258] The passenger compartment floor 420 refers to the floor plate used to form the passenger compartment 400b of the vehicle 1000.

[0259] This allows for the utilization of redundant space within the passenger compartment 400b, improving the space utilization rate inside the vehicle 1000 and increasing the capacity of the battery device 100 in the vehicle 1000.

[0260] In some embodiments, referring to Figures 27 and 29, the vehicle 1000 further includes a mounting beam 410 disposed along a third direction F3 on the side of the passenger compartment floor 420 opposite to the battery device 100. The mounting beam 410 is provided with a slot 410a, which is open along the third direction F3 toward the side of the passenger compartment floor 420 to form an opening. At least a portion of the protrusion 311 extends into the slot 410a through the opening.

[0261] At least a portion of the mounting beam 410 is located within the passenger compartment 400b to facilitate the installation of components such as the center console and seats.

[0262] In this way, by utilizing the space within the slot 410a, it is beneficial to increase the space of the recess 400a, which in turn is beneficial to increase the volume of the battery device 100 in the redundant space within the passenger compartment, and thus improves the space utilization rate inside the vehicle 1000.

[0263] In some other embodiments where the electrical device is a vehicle 1000, referring to Figures 28 and 29, the vehicle 1000 includes a passenger compartment floor 420 and a battery 100 of any of the foregoing embodiments. The passenger compartment floor 420 has a recess 400a recessed on one side of the battery 100. At least a portion of the first busbar 20 and / or at least a portion of the second busbar 21 are located in the recess 400a. Along a third direction F3, the passenger compartment floor 420 protrudes on the side opposite to the battery 100 to form a first protrusion 421 so as to recess the recess 400a on the surface facing the battery 100.

[0264] In other words, the container wall 31 and the crew compartment floor 420 are stacked along the third direction F3, meaning that the container wall 31 and the crew compartment floor 420 are different parts.

[0265] The various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions.

[0266] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure. Industrial applicability

[0267] This disclosure provides a battery device, an electrical device, and a vehicle, which facilitates the arrangement of battery cells and other components within the battery device, increases the current-carrying area of ​​the busbar, reduces resistance, and improves its current-carrying capacity.

Claims

1. A battery device, wherein, include: Multiple battery cell modules arranged along the first direction; A first busbar and a second busbar are disposed on the first wall surface of the battery cell assembly. Both the first busbar and the second busbar are used to electrically connect two adjacent battery cell assemblies along the first direction. Wherein, the first busbar and the second busbar connected to the same battery cell assembly have a distance between the two points on their outer contours that are furthest apart along the second direction that is less than or equal to half the dimension of the first wall surface along the second direction. At least one of the first busbar and the second busbar includes at least two busbar segments, and the at least two busbar segments are stacked along the third direction. At least one end of two adjacent busbar segments is connected to each other in the second direction. The first direction, the second direction and the third direction are perpendicular to each other, and the third direction is perpendicular to the first wall surface.

2. The battery device according to claim 1, wherein, The battery device includes a housing, the housing includes a housing wall, the housing wall encloses an installation space, the battery cell assembly is disposed in the installation space, a portion of the housing wall is recessed to form a receiving space, at least a portion of the first busbar and / or at least a portion of the second busbar are received in the receiving space.

3. The battery device according to claim 2, wherein, In a projection plane perpendicular to the third direction, the projections of the first busbar and the second busbar are both completely located within the projection of the accommodating space.

4. The battery device according to any one of claims 1 to 3, wherein, The battery cell assembly also includes a first electrode lead-out portion and a second electrode lead-out portion, both disposed on the first wall surface. On the same battery cell assembly, the distance between the two points on the outer contour of the first electrode lead-out portion and the outer contour of the second electrode lead-out portion that are furthest apart along the second direction is less than or equal to half the dimension of the first wall surface along the second direction.

5. The battery device according to claim 4, wherein, The battery device includes a housing, the housing includes a housing wall, the housing wall encloses an installation space, the battery cell assembly is disposed in the installation space, a portion of the housing wall is recessed to form a receiving space, at least a portion of the first electrode lead and / or at least a portion of the second electrode lead are received in the receiving space.

6. The battery device according to claim 5, wherein, Projecting along the third direction onto a projection plane perpendicular to the third direction, the projections of the first electrode lead and the second electrode lead are both completely within the projection range of the accommodating space.

7. The battery device according to claim 3 or 6, wherein, A portion of the box wall protrudes along its thickness to form a protrusion, and the accommodating space is located in the protrusion.

8. The battery device according to any one of claims 1 to 7, wherein, On the same battery cell assembly, the first busbar and the second busbar are arranged at intervals along a first direction.

9. The battery device according to claim 8, wherein, On the same battery cell assembly, the first projection area is the projection of the first busbar along the third direction onto a projection plane perpendicular to the third direction, and the second projection area is the projection of the second busbar along the third direction onto a projection plane perpendicular to the third direction. Projecting along the first direction onto a projection surface perpendicular to the first direction, such that the projection of one of the first projection area and the second projection area completely covers the other, or the projection of the first projection area and the projection of the second projection area completely overlap.

10. The battery device according to claim 8 or 9, wherein, The battery cell assembly further includes a first electrode lead-out portion and a second electrode lead-out portion. On the same battery cell assembly, the first electrode lead-out portion includes a first connection portion, and a first busbar is connected to the first connection portion. The second electrode lead-out portion includes a second connection portion, and a second busbar is connected to the second connection portion. The first connection portion and the second connection portion are arranged at intervals along the first direction.

11. The battery device according to any one of claims 1 to 10, wherein, The battery device further includes a sampling component located on the first wall surface along the second direction, on the same side of the first busbar and the second busbar.

12. The battery device according to any one of claims 1 to 11, wherein, The battery cell assembly also includes a pressure relief mechanism located on the first wall surface along the second direction, on the same side of the first busbar and the second busbar.

13. The battery device according to any one of claims 1 to 12, wherein, The maximum dimension of the first busbar along the second direction is less than or equal to one-quarter of the maximum dimension of the battery cell assembly along the second direction. The maximum dimension of the first busbar along the second direction is greater than or equal to one-eighth of the maximum dimension of the battery cell assembly along the second direction. The maximum thickness of the busbar is greater than 1 mm and less than 3 mm. The number of busbar layers located on the first busbar and stacked along the third direction is greater than 2 layers and less than 5 layers.

14. The battery device according to any one of claims 1 to 12, wherein, The maximum dimension of the first busbar along the second direction is less than or equal to one-fifth of the maximum dimension of the battery cell assembly along the second direction, the maximum dimension of the first busbar along the second direction is greater than or equal to one-sixth of the maximum dimension of the battery cell assembly along the second direction, the maximum thickness of the busbar is greater than 1 mm and less than 2 mm, and the number of layers of the busbar stacked on the first busbar and along the third direction is 3.

15. The battery device according to claim 13 or 14, wherein, The maximum dimension of the battery cell assembly along the second direction is less than or equal to 350 mm, and the maximum dimension of the battery cell assembly along the second direction is greater than or equal to 250 mm.

16. The battery device according to any one of claims 1 to 15, wherein, The first busbar includes at least a first busbar and a second busbar, which are stacked along the third direction. The first busbar also includes a first bending portion located at one end of the first busbar along the second direction and used for bending to connect the first busbar and the second busbar.

17. The battery device according to claim 16, wherein, The battery cell assembly further includes a first electrode lead-out portion, the first busbar is welded to the first electrode lead-out portion to form a first weld portion, and the second busbar is provided with at least one of a groove, a through hole, and a notch that penetrates along the third direction at a portion that coincides with the projection of the first weld portion in the third direction.

18. The battery device according to claim 16, wherein, The first busbar further includes a third busbar, which is located on the side of the second busbar away from the first busbar along the third direction. The first busbar also includes a second bend, which is located at the other end of the first busbar along the second direction and is used to bend and connect the second busbar and the third busbar.

19. The battery device according to claim 18, wherein, The battery cell assembly further includes a first electrode lead-out portion, the first busbar is welded to the first electrode lead-out portion to form a first weld portion, and at least one of the second busbar and the third busbar is provided with a groove, a through hole, and a notch that penetrates along the third direction at a portion that coincides with the projection of the first weld portion.

20. [Correction 14.09.2024 according to Rule 91] The battery device according to claim 19, wherein, Both the second busbar and the third busbar have through holes at portions that coincide with the projection of the first welded portion along the third direction. Along the third direction, the through holes on the second busbar and the through holes on the third busbar are at least partially opposite to each other. Alternatively, both the second busbar and the third busbar have through-holes at the portions that coincide with the projection of the first welded portion along the third direction, and the notches on the second busbar and the third busbar are at least partially opposite each other along the third direction.

21. The battery device according to any one of claims 1 to 20, wherein, The distance between the two points on the outer contours of the first busbar and the second busbar, which are connected to the same battery cell assembly, that are furthest apart along the second direction is less than or equal to one-quarter of the dimension of the first wall surface along the second direction.

22. The battery device according to any one of claims 1 to 21, wherein, The battery cell assembly further includes a first electrode lead-out portion. The first busbar is used to electrically connect the first electrode lead-out portions on two adjacent battery cell assemblies along the first direction. In a projection plane perpendicular to the first direction, the projections of the first electrode lead-out portions on two adjacent battery cell assemblies along the first direction at least partially overlap. The first busbar is electrically connected to the overlapping portions of the two first electrode lead-out portions.

23. The battery device according to any one of claims 1 to 22, wherein, Both the first busbar and the second busbar are located on one side of the centerline of the first wall along the second direction.

24. The battery device according to claim 23, wherein, The first wall surface includes a first edge and a second edge opposite each other along the second direction, and the maximum distance from the first edge to the first edge of the first busbar and the second busbar is less than one-quarter of the maximum distance between the first edge and the second edge.

25. The battery device according to any one of claims 1 to 24, wherein, The battery cell assembly further includes a first electrode lead-out portion and a second electrode lead-out portion. The first electrode lead-out portion includes a first connecting portion and a first extension portion. The first connecting portion is used to connect to the first busbar. The first extension portion is located at the end of the first connecting portion away from the second electrode lead-out portion along the second direction. The first extension portion protrudes from the first connecting portion along the first direction. The first extension portion is used to electrically connect to a first tab inside the battery cell assembly, and / or... The second electrode lead-out portion includes a second connecting portion and a second extension portion. The second connecting portion is used to connect to the second busbar. The second extension portion is located at one end of the second connecting portion away from the first electrode lead-out portion along the second direction. The second extension portion protrudes from the second connecting portion along the first direction. The second extension portion is used to electrically connect to the second tab inside the battery cell assembly.

26. An electrical appliance, wherein, The electrical device includes a battery device according to any one of claims 1 to 25, wherein the battery device serves as the power source for the electrical device.

27. The electrical appliance according to claim 26, wherein, The electrical device is a vehicle, which also includes a frame. The battery device is mounted on the frame and includes a casing wall that encloses an installation space. The battery cell assembly is located in the installation space. A portion of the casing wall is recessed to form a receiving space. At least a portion of the first busbar and / or at least a portion of the second busbar are received in the receiving space. A portion of the casing wall protrudes along its thickness to form a protrusion. The receiving space is located in the protrusion. The frame has a recess, and at least a portion of the protrusion extends into the recess.

28. The electrical appliance according to claim 27, wherein, The protrusion protrudes along the third direction, the frame includes a mounting beam disposed on one side of the battery device along the third direction, the mounting beam has a slot, the slot is open along the third direction towards the battery device to form an opening, at least a portion of the protrusion extends into the slot through the opening.

29. The electrical appliance according to claim 27, wherein, The box wall with the protrusion is configured as the passenger compartment floor of the vehicle, with the protrusion facing the passenger compartment.

30. The electrical appliance according to claim 29, wherein, The vehicle also includes a mounting beam disposed along the third direction on the side of the passenger compartment floor opposite to the battery device. The mounting beam has a slot that opens along the third direction toward the side of the passenger compartment floor to form an opening. At least a portion of the protrusion extends into the slot through the opening.

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