Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a plurality of battery monomer assemblies which are arranged along a first direction, the first confluence piece and the second confluence piece are arranged on the first wall surfaces of the battery monomer assemblies and are used for electrically connecting two adjacent battery monomer assemblies along the first direction; the distance between two farthest points of the first confluence piece and the second confluence piece which are connected to the same battery monomer assembly along the second direction is less than or equal to half of the size of the first wall surface along the second direction; at least one of the first bus piece and the second bus piece comprises at least two bus pieces, the at least two bus pieces are stacked in the third direction, and at least one end of every two adjacent bus pieces in the second direction is connected with each other. According to the battery device disclosed by the embodiment of the utility model, the first bus piece and the second bus piece can be arranged on the first wall surface in a centralized manner; and the design that multiple layers of confluence sheets are stacked is adopted, so that the over-current capability of the confluence piece is improved.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of battery devices, and in particular to a battery device and an electrical device. Background Art

[0002] With the development of technology, the application scenarios of new energy battery devices in daily life and industrial production are becoming more and more extensive. For example, in the field of energy storage, batteries are used to store electrical energy; in the automotive field, more and more cars are powered by the electricity provided by batteries.

[0003] The battery device includes a plurality of battery cell assemblies and a busbar. The busbar electrically connects the battery cell assemblies in series and parallel to realize the charge and discharge functions of the battery device.

[0004] In the actual application of battery devices, in order to improve the energy density of the battery device, it is necessary to increase the space occupied by the battery cell assembly in the battery device to make the structure in the battery device more compact. However, since the space available for the arrangement of the busbar is small, the current carrying capacity of the busbar is limited. Utility Model Content

[0005] In view of this, embodiments of the present invention aim to provide a battery device and an electrical device that are conducive to improving the current flow capacity of a busbar within a limited space.

[0006] To achieve the above-mentioned purpose, the technical solution of the embodiment of the utility model is implemented as follows:

[0007] An embodiment of the present invention provides a battery device, comprising a plurality of battery cell assemblies arranged along a first direction, a first current collector and a second current collector.

[0008] A first busbar and a second busbar are disposed on a first wall of the battery cell assembly, and are each used to electrically connect two adjacent battery cell assemblies along a first direction. The first busbar and the second busbar connected to the same battery cell assembly have an outer contour of the first busbar and the second busbar connected such that the distance between the two points furthest apart 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 busbars, and the at least two busbars are stacked along a third direction, with two adjacent busbars connected to each other at at least one end in the second direction. The first, second, and third directions are mutually perpendicular, and the third direction is perpendicular to the first wall.

[0009] The battery device in the embodiment of the present invention, by limiting the maximum distance between the outer contours of the first bus bar and the second bus bar along the second direction, is conducive to the concentrated and compact arrangement of the first bus bar and the second bus bar on the first wall surface, is conducive to the centralized monitoring and protection of the high-voltage area in the battery device formed by the electrical connection of the first bus bar and the second bus bar, and is also conducive to providing a regular space for the arrangement of battery cell assemblies and other components in the battery device, thereby improving the structural compactness of the battery device; on the basis of the relatively concentrated arrangement of the first bus bar and the second bus bar, a multi-layer bus bar stacking design is adopted, which is conducive to increasing the current flow area of ​​the bus bar, reducing the resistance, and improving its flow capacity when the arrangement of each bus bar in the second direction is limited.

[0010] In some embodiments, the battery device includes a housing, which includes walls. The walls are arranged to form an installation space, and the battery cell assembly is positioned within the installation space. A portion of the walls is recessed to form a storage space, and at least a portion of the first busbar and / or at least a portion of the second busbar is accommodated within the storage space. This improves space utilization of the storage space and facilitates centralized information monitoring and protection of the first busbar and the second busbar within the same area.

[0011] In some embodiments, in a projection plane perpendicular to the third direction, the projections of the first and second busbars are completely within the projection of the storage space. This helps the storage space accommodate as many of the first and second busbars as possible, improving space utilization within the storage space. It also reduces the likelihood of interference between the box wall and the first and second busbars during installation, and helps reduce the distance between other parts of the box wall and the area on the first wall of the battery cell assembly where the second and first busbars are not located, making the battery assembly structure more compact.

[0012] In some embodiments, the battery cell assembly further includes a first electrode lead portion and a second electrode lead portion, both disposed on the first wall. On the same battery cell assembly, the distance between the two points of the outer contour of the first electrode lead portion and the outer contour of the second electrode lead portion that are furthest apart along the second direction is less than or equal to half the dimension of the first wall along the second direction. This allows the first and second electrode lead portions to be more centrally located and compactly arranged on the first wall, facilitating the formation of a larger, regular area on the rest of the first wall for the arrangement of other components within the battery assembly, thereby improving the compactness of the battery assembly structure.

[0013] In some embodiments, the battery device includes a housing, which includes housing walls. The housing walls are arranged to form an installation space, and the battery cell assembly is positioned within the installation space. A portion of the housing wall is recessed to form a storage space, and at least a portion of the first electrode lead portion and / or at least a portion of the second electrode lead portion is accommodated within the storage space. This arrangement facilitates accommodating the arrangement of the storage space to accommodate the centralized arrangement of the first and second electrode lead portions, thereby improving space utilization within the storage space. It also facilitates accommodating the shape of the installation space to better accommodate the shape of the portion of the battery cell assembly other than the second electrode lead portion, thereby making the shape of the installation space more regular and improving space utilization within the housing.

[0014] In some embodiments, when projected along the third direction onto a projection plane perpendicular to the third direction, the projection of the first electrode lead portion and the projection of the second electrode lead portion are both completely within the projection range of the accommodation space. This helps to accommodate as many of the first and second electrode lead portions as possible in the accommodation space, improving space utilization within the accommodation space, reducing the probability of interference between the box wall and the first and second electrode lead portions during installation, and reducing the distance between other portions of the box wall and the area on the first wall of the battery cell assembly where the first and second electrode lead portions are not disposed, thereby making the battery assembly structure more compact.

[0015] In some embodiments, a portion of the box wall protrudes along its wall thickness direction to form a convex portion, and the accommodating space is located in the convex portion. This is beneficial for making the wall thickness of each portion of the box wall uniform and for reducing the outer contour size of the box body.

[0016] In some embodiments, on the same battery cell assembly, the first busbar and the second busbar are spaced apart along the first direction. This facilitates a more centralized and compact arrangement of the first busbar and the second busbar. This facilitates arranging the multiple battery cell assemblies into groups and installing them in a battery device, creating a more organized space within the battery device for arranging other components within the battery device, such as the busbar and the sampling assembly, thereby improving space utilization within the battery device.

[0017] In some embodiments, on the same battery cell assembly, the first projection area is a projection of the first busbar along the third direction onto a projection plane perpendicular to the third direction, and the second projection area is a projection of the second busbar along the third direction onto a projection plane perpendicular to the third direction.

[0018] When projected along a first direction onto a projection plane perpendicular to the first direction, the projection of one of the first and second projection areas completely covers the other. This facilitates increasing the cross-sectional dimensions of at least one of the first and second conduits as much as possible to increase flow capacity when the dimensions of the arrangement areas of the first and second conduits along the second direction are limited. For example, when the material of the first conduit inherently has a flow capacity superior to that of the second conduit, the second conduit can be configured to have a larger dimension along the second direction than the first conduit, i.e., the second projection area covers the first projection area. Alternatively, the projection of the first and second projection areas completely overlap. In this way, when the dimensions of the arrangement areas of the first and second conduits along the second direction are limited, the cross-sectional dimensions of both the first and second conduits can be increased as much as possible to increase flow capacity. For example, the dimensions of the first and second conduits along the second direction can be equal to the dimensions of the entire arrangement area along the second direction. Furthermore, this facilitates achieving dimensional consistency between the first and second conduits, facilitating manufacturing.

[0019] In some embodiments, 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, the first busbar is connected to the first connection portion, the second electrode lead-out portion includes a second connection portion, the second busbar is connected to the second connection portion, and the first connection portion and the second connection portion are arranged spaced apart along the first direction. In this way, it is advantageous to arrange the area of ​​the first busbar used for electrical connection to the first connection portion and the area of ​​the second busbar used for electrical connection to the second connection portion along the first direction. On the basis of meeting the insulation spacing between the two areas respectively used to connect the first busbar and the second busbar, it is advantageous to make the arrangement of the first busbar and the second busbar more centralized and compact. In an embodiment where the first projected area and the second projected area completely overlap, the arrangement of the first connection portion and the second connection portion along the first direction is also advantageous to shorten the length of the current path of the first busbar and the second busbar, thereby reducing resistance.

[0020] In some embodiments, the battery device further includes a sampling assembly located on the first wall surface. Along the second direction, the sampling assembly is located on the same side of the first and second current collectors. This arrangement facilitates more efficient use of the regular area on the first wall surface formed by the compact arrangement of the first and second current collectors, thereby improving the utilization rate of the internal space of the battery device.

[0021] 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 manifold and the second manifold. This arrangement facilitates more efficient use of the regular area on the first wall surface formed by the compact arrangement of the first and second manifolds, facilitates increasing the size of the pressure relief mechanism, and thereby increases the flow rate allowed through the pressure relief mechanism, further reducing the risk of explosion in the battery cell assembly.

[0022] In some embodiments, the maximum dimension of the first busbar along the second direction is less than or equal to one-fourth 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 busbars stacked on the first busbar along the third direction is greater than 2 and less than 5. This helps reduce the area occupied by the first busbar along the second direction on the first wall while meeting the current carrying capacity requirements of the first busbar, thereby reducing the size of the battery device and making the battery device more compact. The thickness of the busbar is conducive to meeting the current carrying capacity requirements while also reducing the size occupied by the busbar along the third direction. The current carrying cross-sectional area of ​​the first busbar is conducive to meeting the current carrying capacity requirements while also reducing the size occupied by the first busbar along the third direction.

[0023] 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 busbars stacked on the first busbar along the third direction is three. This helps to further reduce the area occupied by the first busbar along the second direction on the first wall while meeting the current carrying capacity requirements of the first busbar, thereby reducing the size of the battery device and making the battery device more compact. The thickness of the busbar further helps to reduce the area occupied by the busbar along the third direction, and at the same time, the thickness of the busbar facilitates operations such as bending and processing. While meeting the current carrying capacity requirements of the first busbar, this number of busbars helps to reduce manufacturing difficulty and improve production efficiency.

[0024] 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. In this way, the dimensions of the battery cell assembly along the second direction are compatible with the arrangement of the first and second busbars, as well as the stacking of the busbars. This not only makes the arrangement of the battery cell assembly, the first busbar, and the second busbar more compact, but also makes the arrangement of the first and second busbars more conducive to meeting the current carrying capacity requirements of the battery cell assembly.

[0025] In some embodiments, the first busbar includes at least a first busbar and a second busbar, the first busbar and the second busbar being stacked along a third direction. The first busbar further includes a first bend, located at one end of the first busbar along the second direction and configured to bend and connect the first busbar and the second busbar. This not only improves the current flow capacity of the first busbar, but also simplifies the manufacturing process by directly forming the first busbar through bending, thereby improving production efficiency.

[0026] In some embodiments, the battery cell assembly further includes a first electrode lead portion, the first busbar being welded to the first electrode lead portion to form a first weld portion, and the second busbar being provided with at least one of a groove, a through-hole, and a notch extending along the third direction, in a portion thereof projected along the third direction and coinciding with the first weld portion. This improves the current carrying capacity of the first busbar while also reducing the weld thickness between the first busbar and the first electrode lead portion, thereby facilitating improved efficiency in welding and securing the first busbar to the first electrode lead portion, as well as improved weld quality and enhanced stability in securing the electrode lead portion to the busbar.

[0027] In some embodiments, the first busbar further includes a third busbar, the third busbar being located on a side of the second busbar away from the first busbar along the third direction. The first busbar further includes a second bent portion, the second bent portion being located at the other end of the first busbar along the second direction and configured to bend and connect the second busbar and the third busbar. In this manner, the first busbar comprising three stacked busbars is formed by a reciprocating bending process, simplifying the manufacturing process and facilitating improved production efficiency.

[0028] In some embodiments, 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 welded portion. At least one of the second and third busbars is provided with at least one of a groove, a through-hole, and a notch extending along the third direction, in a portion thereof that overlaps with the projection of the first welded portion along the third direction. This arrangement helps reduce the thickness of the weld required during welding of the first busbar to the first electrode lead-out portion, thereby improving welding efficiency and quality.

[0029] In some embodiments, portions of the second busbar and the third busbar that overlap with the projection of the first welding portion along the third direction are both 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;

[0030] Alternatively, portions of the second and third busbars that overlap with the projection of the first welding portion along the third direction are both provided with through notches, and along the third direction, the notches on the second busbar and the notches on the third busbar are at least partially opposite.

[0031] In this way, when the first busbar includes three layers of busbars, it is convenient to perform welding operations on the first welding portion through the through-holes or notches, thereby improving the efficiency of welding and fixing the first busbar and the first electrode lead-out portion, and also helping to improve the welding quality and the stability of fixing the electrode lead-out portion and the busbar.

[0032] In some embodiments, the distance between the two points on the outer contours of a first busbar and a second busbar connected to the same battery cell assembly that are furthest apart along the second direction is less than or equal to one-quarter the dimension of the first wall along the second direction. This facilitates a more compact arrangement of the first busbar and the second busbar along the second direction, thereby improving the compactness of the internal structure of the battery device and enhancing space utilization within the battery device.

[0033] In some embodiments, the battery cell assembly further includes a first electrode lead portion. The first busbar is configured to electrically connect the first electrode lead portions of two adjacent battery cell assemblies along a first direction. In a projection plane perpendicular to the first direction, the projections of the first electrode lead portions of the two adjacent battery cell assemblies along the first direction at least partially overlap, and the first busbar electrically connects the overlapping portion of the projections of the two first electrode lead portions. This facilitates reducing the size of the first busbar along the first direction and reducing the resistance of the first busbar. It also facilitates a more compact arrangement of the first electrode lead portions when multiple battery cell assemblies are grouped. It also facilitates increasing the contact area between the first busbar and the first electrode lead portions when the first busbar extends along the first direction, thereby reducing the resistance of the first busbar.

[0034] In some embodiments, the first and second current collectors are both located on one side of the midline of the first wall along the second direction. This facilitates forming a large, regular area on the first wall, allowing other components of the battery device to be arranged in this area, thereby improving space utilization within the battery device.

[0035] In some embodiments, the first wall includes a first edge and a second edge that are opposed to each other along the second direction, and the maximum distance between the first busbar and the second busbar that is farther from the first edge and the first edge is less than one-quarter of the maximum distance between the first edge and the second edge. In this manner, the first busbar and the second busbar are offset from the first wall to form a large, regular area, which facilitates the placement of other components of the battery device within the area and reduces the likelihood of interference with the placement of the first and second busbars, thereby improving space utilization of the battery device.

[0036] 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 including a first connecting portion and a first extending portion, the first connecting portion being used to connect to the first bus bar, the first extending portion being located at an end of the first connecting portion away from the second electrode lead-out portion along the second direction, the first extending portion protruding from the first connecting portion along the first direction, and the first extending portion being used to electrically connect to a first tab inside the battery cell assembly. By dividing the first electrode lead-out portion into the first connecting portion and the first extending portion, the first connecting portion electrically connected to the first bus bar is facilitated to extend in the second direction, thereby reducing resistance. At the same time, the first extending portion electrically connected to the second tab is facilitated to extend in the first direction, thereby improving the stability of electrical conduction between the first electrode lead-out portion and the first tab, and / or;

[0037] The second electrode lead-out portion includes a second connecting portion and a second extending portion, the second connecting portion is used to connect to the second bus bar, the second extending portion is located at one end of the second connecting portion along the second direction away from the first electrode lead-out portion, and the second extending portion protrudes from the second connecting portion along the first direction, and the second extending portion is used to electrically connect to the second pole ear inside the battery cell assembly. By dividing the second electrode lead-out portion into the second connecting portion and the second extending portion, it is beneficial to extend the second connecting portion electrically connected to the second bus bar along the second direction to reduce resistance. At the same time, it is beneficial to extend the second extending portion electrically connected to the second pole ear along the second direction to improve the stability of electrical conduction between the second electrode lead-out portion and the second pole ear.

[0038] The present invention also provides an electrical device comprising the battery device of any of the aforementioned embodiments, the battery device serving as a power source for the electrical device. This facilitates the compactness of the battery device structure to improve the compactness of the arrangement of other components within the electrical device, thereby increasing space utilization.

[0039] In some embodiments, the electrical device may be a vehicle, which further includes a frame. In the aforementioned embodiments, the battery device is disposed on the frame. The battery device includes a box wall, which encloses a mounting space. The battery cell assembly is disposed in the mounting space. A portion of the box wall is recessed to form a receiving space. At least a portion of the first current collector and / or at least a portion of the second current collector is received in the receiving space. A portion of the box wall protrudes along its wall thickness to form a convex portion. The receiving space is located in the convex portion. The frame is provided with a concave portion, and at least a portion of the convex portion extends into the concave portion. In this manner, through the cooperation of the concave portion and the convex portion, a portion of the battery device can utilize the space in the frame, thereby facilitating improved space utilization and increasing the capacity of the battery device in the vehicle.

[0040] In some embodiments, the protrusion projects along a third direction, and the vehicle frame includes a mounting beam disposed on one side of the battery assembly along the third direction. The mounting beam has a slot that opens toward the battery assembly along the third direction, forming an opening. At least a portion of the protrusion extends through the opening into the slot. This improves utilization of the internal space of the mounting beam, facilitating increased battery capacity in the vehicle. The frame can be moved along the third direction to allow the protrusion to enter the slot through the opening, simplifying assembly steps.

[0041] In some embodiments, the box wall with the convex portion is configured as the passenger compartment floor of the vehicle, with the convex portion facing the passenger compartment. This is beneficial for utilizing the redundant space in the passenger compartment, improving the space utilization rate of the vehicle interior, and increasing the vehicle capacity.

[0042] In some embodiments, the vehicle further includes a mounting beam disposed along a third direction on a side of the passenger compartment floor facing away from the battery assembly. The mounting beam includes a slot, the slot opening toward the passenger compartment floor along the third direction to form an opening, and at least a portion of the protrusion extends through the opening into the slot. Thus, utilizing the space within the slot increases the space within the recess, thereby increasing the volume of the redundant space within the passenger compartment for the battery assembly, thereby improving space utilization within the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of an embodiment of the present invention in which the electrical device is a vehicle;

[0044] Figure 2 This is an exploded diagram of a battery device in one embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of a battery device in the first embodiment of the present invention;

[0046] Figure 4 for Figure 3 A partial cross-sectional schematic diagram of a battery device according to an embodiment of the present invention;

[0047] Figure 5 for Figure 4 A partial enlarged schematic diagram of position B in the middle;

[0048] Figure 6 for Figure 4 A schematic diagram of the arrangement of the battery cell assembly, the first busbar and the second busbar;

[0049] Figure 7 for Figure 6 Schematic diagram of a battery cell assembly;

[0050] Figure 8 This is a partial cross-sectional diagram of the battery device in the second embodiment of the present invention, wherein the cross-sectional position is Figure 3 Middle AA position;

[0051] Figure 9 This is a schematic diagram of a battery cell assembly in the third embodiment of the present invention;

[0052] Figure 10 This is a schematic diagram of a battery cell assembly in a fourth embodiment of the present invention;

[0053] Figure 11 This is a schematic diagram of a battery cell assembly in a fifth embodiment of the present invention;

[0054] Figure 12 A schematic diagram of a battery cell assembly, a first busbar, a second busbar, and a sampling assembly in a sixth embodiment of the present invention;

[0055] Figure 13 for Figure 12 A schematic diagram of a battery cell assembly in an embodiment;

[0056] Figure 14 A schematic diagram of a first busbar in a seventh embodiment of the present invention;

[0057] Figure 15 for Figure 14 A schematic diagram of the first busbar from another perspective;

[0058] Figure 16 for Figure 14 A schematic diagram of the first busbar in an unbent state;

[0059] Figure 17 A schematic diagram of a first busbar in an eighth embodiment of the present utility model;

[0060] Figure 18 for Figure 17 A schematic diagram of the first busbar from another perspective;

[0061] Figure 19 for Figure 17A schematic diagram of the first busbar in an unbent state;

[0062] Figure 20 Schematic diagram of a battery cell assembly, a first current collector, and a second current collector in a ninth embodiment of the present invention, wherein the center line is the center line of the first wall along the second direction;

[0063] Figure 21 A schematic diagram of a battery cell assembly, a first busbar, a second busbar, and a sampling assembly in a tenth embodiment of the present invention;

[0064] Figure 22 for Figure 21 A partial enlarged schematic diagram of the middle C position;

[0065] Figure 23 for Figure 21 Schematic diagram of a battery cell assembly;

[0066] Figure 24 for Figure 23 Schematic cross-section of the middle DD position;

[0067] Figure 25 for Figure 24 A partial enlarged schematic diagram of position E in the middle;

[0068] Figure 26 This is a schematic cross-sectional view of a vehicle in the eleventh embodiment of the present utility model;

[0069] Figure 27 for Figure 26 A partial enlarged schematic diagram of the F position in the middle;

[0070] Figure 28 This is a schematic cross-sectional view of a vehicle in the twelfth embodiment of the present utility model;

[0071] Figure 29 for Figure 28 A locally enlarged schematic diagram of the G position in the middle.

[0072] Description of Reference Numerals

[0073] 1000, vehicle; 100, battery device; 10, battery cell assembly; 10a, first wall; 10b, first edge; 10c, second edge; 11, first electrode lead; 111, first connecting portion; 112, first extension; 12, second electrode lead; 121, second connecting portion; 122, second extension; 13, pressure relief mechanism; 14, first tab; 15, second tab; 20, first busbar; 21, second busbar; 23, busbar; 23a, through-hole; 231, first busbar; 231a, first welding portion; 232, Second busbar; 233, first bend; 234, third busbar; 235, second bend; 30, box body; 30a, installation space; 31, box wall; 31a, accommodating space; 311, convex portion; 32, top cover; 33, bottom plate; 40, sampling assembly; 200, controller; 300, motor; 400, frame; 400a, concave portion; 400b, passenger compartment; 410, mounting beam; 410a, slot; 420, passenger compartment floor; 421, first convex portion; c1, center line; F1, first direction; F2, second direction; F3, third direction. DETAILED DESCRIPTION

[0074] It should be noted that, in the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present invention and should not be regarded as an improper limitation on the present invention.

[0075] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0076] In the description of the embodiments of this utility model, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this utility model, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0077] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this disclosure may be combined with other embodiments.

[0078] In the description of the embodiments of the present invention, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exists simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the related objects are in an "or" relationship.

[0079] In the description of the embodiments of the present invention, for the convenience of explanation, as shown in FIG. Figure 4 、 Figure 6 、 Figure 12 、 Figure 13 Figure 21 As shown by the arrow in , the direction of arrow F1 is the first direction; Figure 4 、 Figure 6 、 Figure 12 、 Figure 21 As shown by the arrow in , the direction of arrow F2 is the second direction. Figure 4 、 Figure 8 、 Figure 15 、 Figure 17 、 Figure 26 and Figure 28 As shown by the arrow in , the direction of arrow F3 is the third direction.

[0080] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0081] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0082] Currently, battery devices are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application areas of battery devices continue to expand, market demand is also growing.

[0083] The battery cell involved in the embodiments of the present invention may include an electrode assembly and an electrolyte. The electrode assembly may be composed of a positive electrode sheet, a negative electrode sheet, and a separator. Such a battery cell can operate by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collectors not coated with the positive electrode active material layer, after being stacked, serve as the positive electrode tab. Taking lithium-ion batteries as an example, the positive electrode current collector may be made of aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collectors not coated with the negative electrode active material layer, after being stacked, serve as 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. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure. Furthermore, the battery cells involved in the embodiments of the present invention can also be solid-state battery cells.

[0084] The battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be recharged to activate the active material after the battery cell is discharged and can be used continuously.

[0085] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present invention.

[0086] The battery cells may be cylindrical, prismatic, soft-pack or other shapes. Prismatic cells include square-shell, blade-shaped, and polygonal cells. Polygonal cells may be, for example, hexagonal cells. The present invention has no particular limitations.

[0087] The emissions from the battery cells mentioned in the present invention include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0088] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present invention may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include one or more battery cells. When the battery cell assembly is formed by multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection through a busbar component. When the battery cell assembly includes only one battery cell, the corresponding power supply voltage and capacity can be formed in the battery apparatus by connecting multiple battery cell assemblies in series, in parallel, or in mixed connection.

[0089] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0090] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the housing.

[0091] As an example, the battery cell assembly may be a battery module, which may be accommodated in the box by fixing the battery module in the box.

[0092] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0093] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0094] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0095] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0096] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0097] Figure 2 This is a three-dimensional exploded schematic diagram of the battery device 100 provided in an embodiment of the present invention. Figure 2 As shown, the battery device 100 includes a case 30 and at least one battery cell assembly 10 .

[0098] The box body 30 includes a top cover 32 and a bottom plate 33 . The top cover 32 covers the bottom plate 33 , so that an installation space for placing the battery cell assembly 10 is formed between the bottom plate 33 and the top cover 32 .

[0099] The technical solutions described in the embodiments of the present invention are applicable to various electrical devices that use battery cells and battery devices 100, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0100] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present invention is taken as an example of a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0101] Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in one embodiment of the present invention. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is installed inside vehicle 1000. Battery device 100 can be installed at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as an operating power source for vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery device 100 to power motor 300, for example, to meet the power requirements of vehicle 1000 during startup, navigation, and driving.

[0102] In some embodiments of the present invention, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0103] Below, the embodiments of the present utility model are described in detail.

[0104] In the related art, a battery device includes a busbar and a plurality of battery cell assemblies. The busbar electrically connects two battery cell assemblies to achieve series and parallel electrical connections between the battery cell assemblies.

[0105] When the various busbars connected to the battery cell assembly are arranged in a dispersed manner, it is not conducive to the arrangement of other components in the battery device. At the same time, since the busbars are used for electrical connection, they need to be provided with electrical protection, which will cause the corresponding electrical protection parts to be larger in size to protect each busbar at the same time, which increases the material cost and makes assembly inconvenient; and if electrical protection parts are provided for each busbar separately, the number of electrical protection parts will be too large, which will increase the cost and is not conducive to improving the assembly rate. If the various busbars are simply arranged in a concentrated manner, the space for arranging the busbars will be narrow, which will easily lead to insufficient overcurrent width of the busbars and affect their overcurrent internal resistance, resulting in insufficient overcurrent capacity of the busbars.

[0106] Based on the above-mentioned problems, an embodiment of the present invention provides a battery device, comprising a plurality of battery cell assemblies arranged along a first direction F1, a first busbar, and a second busbar. The first busbar and the second busbar are both electrically connected to the same battery cell assembly and are respectively electrically connected to other battery cell assemblies. The first busbar and the second busbar are both disposed on the same wall of the battery cell assembly. The distance between the two most distant points of the first busbar and the second busbar along a second direction F2 is less than or equal to half the dimension of the first wall along the second direction F2. One of the first busbar and the second busbar includes a plurality of stacked busbars, and the first direction F1, the second direction F2, and the stacking direction are perpendicular to each other. In this manner, the first busbar and the second busbar are arranged at centralized connection locations on the battery cell assembly, while the multi-layer busbars increase the current carrying capacity of the busbar.

[0107] Specifically, see Figures 3 to 6 The battery device 100 includes a battery cell assembly 10 , a first busbar 20 , and a second busbar 21 .

[0108] A plurality of battery cell assemblies 10 are arranged along a first direction F1; a first bus 20 and a second bus 21 are both disposed on a first wall 10a of the battery cell assembly 10, and the first bus 20 and the second bus 21 are both used to electrically connect two battery cell assemblies 10 adjacent to each other along the first direction F1; wherein, the distance between the two points of the outer contours of the first bus 20 and the second bus 21 connected to the same battery cell assembly 10 that are farthest apart along the second direction F2 is less than or equal to half of the size of the first wall 10a along the second direction F2, at least one of the first bus 20 and the second bus 21 includes at least two bus bars 23, and the at least two bus bars 23 are stacked along a third direction F3, and two adjacent bus bars 23 are connected to each other at 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 10a.

[0109] The battery cell assembly 10 may refer to a single battery cell, or may be a unit formed by electrically connecting a plurality of battery cells in series or in parallel.

[0110] A battery cell is the smallest component in the battery device 100 that can realize charging and discharging functions through electrochemical reactions.

[0111] The wall surface refers to each outer surface forming the battery cell assembly 10. It is understandable that the battery cell assembly 10 may have one or more wall surfaces.

[0112] The first wall surface 10 a is a wall surface of the battery cell assembly 10 where the first busbar 20 and the second busbar 21 are provided.

[0113] The first busbar 20 and the second busbar 21 electrically connect the battery cell assemblies 10 adjacent to each other along the first direction F1 , so that electrical connection between the battery cell assemblies 10 is achieved through the first busbar 20 and the second busbar 21 .

[0114] It should be noted that the first busbar 20 and the second busbar 21 refer to two busbars among the at least two busbars electrically connected to the battery cell assembly 10 , and the shapes and sizes of the first busbar 20 and the second busbar 21 may be the same or different.

[0115] See Figure 6 、 Figures 9 to 12 、 Figure 20 and Figure 21The distance between the two points 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 L1, and the dimension of the first wall 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 10a along the second direction F2 more compact, creating a larger, unbroken area on the first wall 10a for the arrangement of other components of the battery device 100, thereby improving the compactness of the internal structure of the battery device 100.

[0116] At least one of the first busbar 20 and the second busbar 21 includes at least two busbars 23. Only the first busbar 20 may include two or more busbars 23, or only the second busbar 21 may include two or more busbars 23. Alternatively, both the first busbar 20 and the second busbar 21 may include two or more busbars 23.

[0117] Adjacent bus bars 23 are connected to each other so that electrical conduction is achieved between the bus bars 23 .

[0118] The bus bars 23 are stacked along the third direction F3 , which helps to reduce the size of at least one of the first bus bar 20 and the second bus bar 21 along the second direction F2 and the first direction F1 .

[0119] It is understood that the first busbar 20 and the second busbar 21 are both 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 busbars 23 are stacked along the third direction F3, which is perpendicular to the first direction F1. This helps increase the cross-sectional area of ​​at least one of the first busbar 20 and the second busbar 21 perpendicular to the conductive path, thereby reducing resistance and improving current carrying capacity.

[0120] The battery device 100 in the embodiment of the present invention, by limiting the maximum distance between the outer contours of the first bus 20 and the second bus 21 along the second direction F2, is conducive to the centralized and compact arrangement of the first bus 20 and the second bus 21 on the first wall 10a, and is conducive to centralized monitoring and protection of the high-voltage area in the battery device 100 formed by the electrical connection of the first bus 20 and the second bus 21. It is also conducive to providing 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; based on the relatively centralized arrangement of the first bus 20 and the second bus 21, a design of stacking multiple layers of bus sheets 23 is adopted, which is conducive to increasing the current flow area of ​​the bus, reducing the resistance, and improving its flow capacity when the arrangement of each bus is limited in the second direction F2.

[0121] It is understandable that in the embodiment where both the first busbar 20 and the second busbar 21 include busbars 23 , the number of busbars 23 included in the first busbar 20 and the number of busbars 23 included in the second busbar 21 may be the same or different.

[0122] In some embodiments, see Figures 3 to 5 、 Figure 8 The battery device 100 includes a box body 30, the box body 30 includes a box wall 31, the box wall 31 is surrounded to form an installation space 30a, the battery cell assembly 10 is arranged in the installation space 30a, a portion of the box wall 31 is recessed to form an accommodating space 31a, and at least a portion of the first busbar 20 is accommodated in the accommodating space 31a.

[0123] The box body 30 is used to provide a location for arranging components such as the battery cell assembly 10 , the first busbar 20 , and the second busbar 21 , and to provide protection.

[0124] The box wall 31 refers to the corresponding structure forming 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.

[0125] A portion of the box wall 31 is recessed in a direction away from the installation space 30 a to form an accommodating space 31 a , and the accommodating space 31 a is communicated with the installation space 30 a .

[0126] This helps reduce the distance between other parts of the box wall 31 and the area on the first wall surface 10 a of the battery cell assembly 10 where the first current collector 20 is not arranged, thereby improving space utilization within the battery device 100 .

[0127] In some embodiments, see Figures 3 to 5 、 Figure 8 The battery device 100 includes a box body 30, the box body 30 includes a box wall 31, the box wall 31 is surrounded to form an installation space 30a, the battery cell assembly 10 is arranged in the installation space 30a, a portion of the box wall 31 is recessed to form an accommodating space 31a, and at least a portion of the second busbar 21 is accommodated in the accommodating space 31a.

[0128] This helps reduce the distance between other parts of the box wall 31 and the area on the first wall 10 a of the battery cell assembly 10 where the second current collector 21 is not arranged, thereby improving space utilization within the battery device 100 .

[0129] In some embodiments with a box body 30, a box wall 31, an installation space 30a and a receiving space 31a, see Figures 3 to 5 、 Figure 8At least a portion of the second current collector 21 and at least a portion of the first current collector 20 are both accommodated in the accommodation space 31 a.

[0130] This is beneficial to improving the space utilization rate of the accommodating space 31 a and is also convenient for centralized information monitoring and protection of the first busbar 20 and the second busbar 21 in the same area.

[0131] In some embodiments, see Figure 8 In the projection plane perpendicular to the third direction F3, the projection of the first current collector 20 and the projection of the second current collector 21 are both completely located in the projection of the accommodating space 31 a.

[0132] In this way, it is beneficial to allow the accommodating space 31a to accommodate as many of the first busbar 20 and the second busbar 21 as possible, thereby improving the space utilization rate within the accommodating space 31a and reducing the probability of interference between the box wall 31 and the first busbar 20 and the second busbar 21 during the installation process. It is beneficial to reduce the distance between other parts of the box wall 31 and the area on the first wall 10a of the battery cell assembly 10 where the second busbar 21 and the first busbar 20 are not arranged, thereby making the battery device 100 structure more compact.

[0133] The battery cell assembly 10 is provided with an electrode lead-out portion, which can be used to electrically connect to the first busbar 20 or the second busbar 21 so that current can be conducted between the battery cell assembly 10 and the busbar.

[0134] It is understandable that the arrangement position of the electrode lead portion directly affects the arrangement position of the first busbar 20 and the second busbar 21 electrically connected thereto. Figure 7 The battery cell assembly 10 further includes a first electrode lead-out portion 11 and a second electrode lead-out portion 12, both of which are provided on the first wall surface 10a. On the same battery cell assembly 10, the distance between the two points of 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 farthest apart along the second direction F2 is less than or equal to half of the size of the first wall surface 10a along the second direction F2.

[0135] The first electrode lead portion 11 and the second electrode lead portion 12 are both located on the first wall surface 10 a , so that the busbars electrically connected to the first electrode lead portion 11 and the second electrode lead portion 12 are also located on the first wall surface 10 a .

[0136] The distance between the two points of the first electrode lead portion 11 and the second electrode lead portion 12 that are farthest apart along the second direction F2 is L3, and L3≤0.5*L2.

[0137] In this way, the first electrode lead portion 11 and the second electrode lead portion 12 can be arranged more centrally and compactly on the first wall 10a, which is conducive to forming a larger regular area in other parts of the first wall 10a for arranging other components in the battery device 100, thereby improving the compactness of the battery device 100 structure.

[0138] In some embodiments, see Figure 8 At least one of the first electrode lead portion 11 and the second electrode lead portion 12 protrudes from the first wall surface 10 a to reduce the probability of the current busbar contacting other parts of the battery cell assembly 10 and causing a short circuit.

[0139] In some embodiments with a box body 30, a box wall 31, an installation space 30a and a receiving space 31a, see Figure 7 At least part of the first electrode lead-out portion 11 is accommodated in the accommodation space 31a. Figure 7 As shown, in some other embodiments, part of the first electrode lead-out portion 11 may be located outside the accommodating space 31 a.

[0140] This helps to make the spatial shape of the installation space 30a better adapt to the shape of the portion outside the first electrode lead-out portion 11 of the battery cell assembly 10, makes the shape of the installation space 30a more regular, and improves the space utilization rate in the box body 30.

[0141] In some embodiments with a box body 30, a box wall 31, an installation space 30a and a receiving space 31a, see Figure 8 , at least part of the second electrode lead-out portion 12 is accommodated in the accommodation space 31a. Figure 8 As shown, in some other embodiments, part of the second electrode lead-out portion 12 may be located outside the accommodating space 31 a.

[0142] This helps to make the spatial shape of the installation space 30a better adapt to the shape of the portion outside the second electrode lead-out portion 12 of the battery cell assembly 10, makes the shape of the installation space 30a more regular, and improves the space utilization rate in the box body 30.

[0143] In some embodiments with a box body 30, a box wall 31, an installation space 30a and a receiving space 31a, see Figure 8 At least part of the first electrode lead-out portion 11 and at least part of the second electrode lead-out portion 12 are both accommodated in the accommodation space 31a. Figure 8 As shown, in some other embodiments, the first electrode lead portion 11 and the second electrode lead portion 12 may each have a portion located outside the accommodating space 31 a .

[0144] In this way, the arrangement of the accommodating space 31a is conducive to adapting the 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 is conducive to making the spatial shape of the installation space 30a better adapt to the shape of the part outside the second electrode lead-out portion 12 on the battery cell assembly 10, thereby making the shape of the installation space 30a more regular, thereby improving the space utilization rate within the box body 30.

[0145] In some embodiments, see Figure 8 , projected along the third direction F3 onto a projection plane perpendicular to the third direction F3, the projection of the first electrode lead portion 11 and the projection of the second electrode lead portion 12 are both completely located within the projection range of the accommodation space 31a. Figure 8 The busbar shown is Figure 6 In other embodiments, for example Figures 9 to 12 、 Figure 20 and Figure 21 In the structures shown, the third direction F3 is projected onto a projection plane perpendicular to the third direction F3 so that the projections of the first electrode lead portion 11 and the second electrode lead portion 12 are completely located within the projection range of the accommodating space 31 a .

[0146] In this way, it is beneficial to allow the accommodating space 31a to accommodate as many of the first electrode lead-out portion 11 and the second electrode lead-out portion 12 as possible, thereby improving the space utilization rate within the accommodating space 31a and reducing the probability of interference between the box wall 31 and the first electrode lead-out portion 11 and the second electrode lead-out portion 12 during the installation process. It is beneficial to reduce the distance between other parts of the box wall 31 and the area on the first wall 10a of the battery cell assembly 10 where the first electrode lead-out portion 11 and the second electrode lead-out portion 12 are not arranged, thereby making the battery device 100 more compact.

[0147] In some embodiments, see Figure 5 and Figure 8 A portion of the box wall 31 protrudes along its wall thickness direction to form a convex portion 311 , and the accommodating space 31 a is located in the convex portion 311 .

[0148] The wall thickness of the box wall 31 refers to the distance between the surface of the box wall 31 facing the installation space 30a and the surface of the box wall 31 facing away from the installation space 30a. The wall thickness direction is the linear direction of this distance.

[0149] In this way, the wall thickness of each part of the box wall 31 is made the same, which helps to reduce the outer contour size of the box body 30.

[0150] The specific manner of forming the convex portion 311 by protruding a portion of the box wall 31 along the wall thickness direction is not limited. For example, the convex portion 311 can be formed by punching a portion of the box wall 31 through a mold.

[0151] In some embodiments, the wall thickness direction and the protruding direction of the protrusion 311 are the third direction F3.

[0152] In some embodiments, see Figures 9 to 12 、 Figure 20 and Figure 21 On the same battery cell assembly 10 , the first busbars 20 and the second busbars 21 are arranged at intervals along the first direction F1 .

[0153] That is, on the same battery cell, there are at least two current collectors, with portions of the portions facing each other along the first direction F1. The two current collectors may face each other along the first direction F1, or may partially face each other along the first direction F1.

[0154] In this way, the arrangement of the first busbar 20 and the second busbar 21 is facilitated to be more centralized and compact, and when the multiple battery cell assemblies 10 are arranged into groups and installed in the battery device 100, a relatively regular space can be formed in the battery device 100 to facilitate the arrangement of other components in the battery device 100 such as the busbar, the sampling assembly 40, etc., which is conducive to improving the space utilization within the battery device 100.

[0155] It can be understood that the distance between the two points of the first bus 20 and the second bus 21 connected to the same battery cell assembly 10 that are farthest apart along the second direction F2, i.e., L1, is directly related to the size of the portion on the first wall 10a outside the arrangement of the first bus 20 and the second bus 21 that can be used to arrange other components in the battery device 100.

[0156] In some embodiments, see Figure 9 and Figure 11 On the same battery cell assembly 10, the first projection area is the projection of the first bus 20 along the third direction F3 onto a projection plane perpendicular to the third direction F3, the second projection area is the projection of the second bus 21 along the third direction F3 onto a projection plane perpendicular to the third direction F3, and the projection along the first direction F1 onto a projection plane perpendicular to the first direction F1, and the projection of one of the first projection area and the second projection area completely covers the other.

[0157] That is to say, 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 one with the smaller projection range is completely located inside the one with the larger projection range. In this way, the size of one of the first conduit 20 and the second conduit 21 along the second direction F2 is larger than the size of the other along the second direction F2.

[0158] In this way, when the arrangement area of ​​the first and second current collectors 20 and 21 is limited in size along the second direction F2, the flow cross-sectional size of at least one of the first and second current collectors 20 and 21 is increased as much as possible to increase the flow capacity.

[0159] For example, when 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 be larger than the first busbar 20 in the second direction, that is, the second projection area covers the first projection area.

[0160] In some embodiments, see Figure 9 and Figure 11 On the same battery cell assembly 10, the first projection area is the projection of the first bus 20 along the third direction F3 onto a projection plane perpendicular to the third direction F3, the second projection area is the projection of the second bus 21 along the third direction F3 onto a projection plane perpendicular to the third direction F3, and the projection along the first direction F1 onto a projection plane perpendicular to the first direction F1, and the projections of one of the first projection area and the second projection area completely overlap.

[0161] That is, the first bus bar 20 and the second bus bar 21 both have the same size along the second direction F2 .

[0162] In this way, when the arrangement area of ​​the first and second current collectors 20, 21 is limited in size along the second direction F2, the flow cross-sectional dimensions of both the first and second current collectors 20, 21 can be increased as much as possible to enhance the flow capacity. For example, the dimensions of the first and second current collectors 20, 21 along the second direction can be equal to the dimensions of the entire arrangement area along the second direction F2. This also facilitates dimensional consistency between the first and second current collectors 20, 21, facilitating manufacturing.

[0163] There is no limitation on the specific manner of arranging the first current collectors 20 and the second current collectors 21 in an alternate manner along the first direction F1 .

[0164] For example, see Figure 12 and Figure 13 The battery cell assembly 10 also 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 connecting portion 111, and the first bus 20 is connected to the first connecting portion 111. The second electrode lead-out portion 12 includes a second connecting portion 121, and the second bus 21 is connected to the second connecting portion 121. The first connecting portion 111 and the second connecting portion 121 are arranged at intervals along the first direction F1.

[0165] The first connection portion 111 refers to a portion of the first electrode lead portion 11 used to achieve electrical connection with the first current bus 20 .

[0166] The second connection portion 121 refers to a portion of the second electrode lead-out portion 12 used to achieve electrical connection with the second current bus 21 .

[0167] This facilitates the arrangement of the area of ​​the first busbar 20 electrically connected to the first connection portion 111 and the area of ​​the second busbar 21 electrically connected to the second connection portion 121 along the first direction F1. This facilitates a more centralized and compact arrangement of the first and second busbars 20, 21, while ensuring insulation spacing between the two areas respectively used to connect the first and second busbars 20, 21. In embodiments where the first and second projected areas completely overlap, the arrangement of the first and second connection portions 111, 121 along the first direction F1 further facilitates shortening the length of the current paths of the first and second busbars 20, 21, thereby reducing resistance.

[0168] In some embodiments, the first electrode lead portion 11 and the second electrode lead portion 12 have opposite polarities, that is, one of them is positive and the other is negative.

[0169] In some embodiments, see Figure 12 and Figure 21 The battery device 100 further includes a sampling assembly 40 . The sampling assembly 40 is located on the first wall 10 a . Along the second direction F2 , the sampling assembly 40 is located on the same side of the first current collector 20 and the second current collector 21 .

[0170] The sampling assembly 40 is used to collect information such as the temperature and voltage of the battery cell assembly 10 by being electrically connected to the battery cell assembly 10, and transmit this information to the battery management system (BMS) in the battery device 100 to monitor the working status of the battery cell assembly 10.

[0171] The sampling component 40 is located on the first wall surface 10 a , which means that the sampling component 40 is placed on the first wall surface 10 a .

[0172] The sampling assembly 40 is located on the same side of the first convergence piece 20 and the second convergence piece 21. The sampling assembly 40 can be located on the side of the second convergence piece 21 away from the first convergence piece 20 along the second direction F2, or the sampling assembly 40 can be located on the side of the first convergence piece 20 away from the second convergence piece 21 along the second direction F2.

[0173] In this way, the arrangement of the sampling assembly 40 can more effectively utilize the regular area formed on the first wall 10 a due to the compact arrangement of the first and second current collectors 20 and 21 , thereby improving the utilization rate of the internal space of the battery device 100 .

[0174] In some embodiments, see Figure 6 、 Figure 12 and Figure 21 The battery cell assembly 10 further includes a pressure relief mechanism 13 , which is located on the first wall 10 a and on the same side of the first busbar 20 and the second busbar 21 along the second direction F2 .

[0175] The pressure relief mechanism 13 is used to be triggered to open 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 explosion of the battery cell assembly 10.

[0176] The pressure relief mechanism 13 is located on the same side of the first convergence piece 20 and the second convergence piece 21. The pressure relief mechanism 13 can be located on the side of the second convergence piece 21 away from the first convergence piece 20 along the second direction F2, or on the side of the first convergence piece 20 away from the second convergence piece 21 along the second direction F2.

[0177] In this way, the arrangement of the pressure relief mechanism 13 can more effectively utilize the regular area formed on the first wall 10a due to the compact arrangement of the first collector 20 and the second collector 21, which is conducive to increasing the size of the pressure relief mechanism 13 so as to increase the flow rate allowed to pass through the pressure relief mechanism 13, and further reduce the risk of explosion of the battery cell assembly 10.

[0178] The specific form of the pressure relief mechanism 13 is not limited, such as a pressure relief valve.

[0179] In some embodiments with a pressure relief mechanism 13 and a sampling assembly 40, see Figure 23 The pressure relief mechanism 13 and the sampling assembly 40 are both located on the same side of the first manifold 20 and the second manifold 21, so as to more effectively utilize the regular area formed on the first wall 10a due to the compact arrangement of the first manifold 20 and the second manifold 21, thereby improving the space utilization of the battery device 100.

[0180] In some embodiments, the maximum dimension of the first bus 20 along the second direction F2 is less than or equal to one-fourth of the maximum dimension of the battery cell assembly 10 along the second direction F2, and the maximum dimension of the first bus 20 along the second direction F2 is greater than or equal to one-eighth of the maximum dimension of the battery cell assembly 10 along the second direction F2.

[0181] See Figure 6 The dimension of the first current collector 20 along the second direction F2 is L4, and 0.125*L2≤L4≤0.25*L2.

[0182] In this way, while meeting the current carrying capacity requirement of the first busbar 20 , the range occupied by the first busbar 20 on the first wall 10a along the second direction F2 is reduced, which helps to reduce the size of the battery device 100 and make the structure of the battery device 100 more compact.

[0183] Furthermore, in some embodiments, 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. That is, 1 / 6*L2≤L4≤0.2*L2.

[0184] In this way, while meeting the current carrying capacity requirement of the first busbar 20, the range occupied by the first busbar 20 on the first wall 10a along the second direction F2 is further reduced, which is conducive to reducing the size of the battery device 100 and making the structure of the battery device 100 more compact.

[0185] The specific size of the first busbar 20 along the second direction F2 is not limited, for example, 50 mm (millimeters), 52 mm, 54 mm, 56 mm, 58 mm, 60 mm, 62 mm, 64 mm, etc.

[0186] In some embodiments, the maximum thickness of the busbar 23 is greater than 1 mm and less than 3 mm. Figure 15 and Figure 17 The maximum thickness of the busbar 23 is L5, that is, 1 mm < L5 < 3 mm.

[0187] The thickness of the busbar 23 refers to the smallest dimension among the three dimensions of the busbar 23 .

[0188] In this way, the thickness of the busbar 23 is conducive to meeting the current overflow requirement, and at the same time, is conducive to reducing the size occupied by the busbar 23 along the third direction F3.

[0189] 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.

[0190] In this way, the thickness of the busbar 23 is further conducive to reducing the size occupied by the busbar 23 along the third direction F3. At the same time, the thickness of the busbar 23 is convenient for operations such as bending and processing.

[0191] The specific value of the maximum thickness of the busbar 23 is not limited, for example, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or 1.9 mm.

[0192] It can be understood that the thickness direction of the busbar 23 is the third direction F3.

[0193] In some embodiments, see Figure 15 and Figure 18 The number of layers of busbars 23 stacked on the first busbar 20 along the third direction F3 is greater than 2 and less than 5.

[0194] In this way, the current flow cross-sectional area of ​​the first busbar 20 is conducive to meeting the current flow requirement, and is also conducive to reducing the size occupied by the first busbar 20 along the third direction F3.

[0195] Furthermore, in some embodiments, see Figure 18 The number of busbars 23 stacked on the first busbar 20 along the third direction F3 is three.

[0196] In this way, while meeting the requirement of the flow capacity of the first busbar 20 , the number of busbars 23 of this number is conducive to reducing the manufacturing difficulty and improving the production efficiency.

[0197] 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.

[0198] In this way, the size of the battery cell assembly 10 along the second direction F2 is respectively adapted to the arrangement of the first bus 20 and the second bus 21 and the stacking of the bus bar 23, which makes the arrangement of the battery cell assembly 10, the first bus 20 and the second bus 21 more compact, and makes the arrangement of the first bus 20 and the second bus 21 conducive to meeting the current flow capacity requirements of the battery cell assembly 10.

[0199] The specific method for achieving electrical connection between two adjacent bus bars 23 is not limited.

[0200] For example, see Figure 5 、 Figure 14 and Figure 15 The first busbar 20 includes at least a first busbar 231 and a second busbar 232, which are stacked along the 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 the second direction F2 and is used to bend and connect the first busbar 231 and the second busbar 232.

[0201] The first bus bar 231 and the second bus bar 232 are two bus bars 23 , among the plurality of bus bars 23 of the first bus member 20 , that are adjacently stacked along the third direction F3 .

[0202] The first bending portion 233 refers to a portion of the first busbar 20 where the blank is bent.

[0203] The first bending portion 233 is located at one end of the first busbar 20 along the second direction F2, that is, the first bending portion 233 is located at the edge of the first busbar 231 and the second busbar 232 along the second direction F2, so that in the process of the current passing 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, which is beneficial to increase the cross-section of the current flow path.

[0204] 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 improves the production efficiency.

[0205] The specific material of the busbar 23 is not limited, for example, metal materials such as copper and aluminum can be used to achieve bending of the busbar 23 by utilizing the ductility of the metal.

[0206] In some embodiments, see Figure 4 and Figure 5 The axial direction of the bending of the first bending portion 233 is the first direction F1, so that the multiple busbars 23 can increase the cross-section of the current flow path and improve the current flow capacity of the first busbar 20.

[0207] It is understandable that the electrode lead portion needs to be fixed to the busbar to maintain the stability of electrical conduction between the two. The method of fixing the two is not limited, such as welding.

[0208] In some embodiments, see Figure 5 、 Figures 14 to 16 The battery cell assembly 10 also includes a first electrode lead-out portion 11, a first busbar 231 is welded to the first electrode lead-out portion 11 to form a first welding portion 231a, and a portion of the second busbar 232 that overlaps with the projection of the first welding portion 231a along the third direction F3 is provided with at least one of a groove, a through hole 23a, and a notch that passes through along the third direction F3.

[0209] On the first busbar 20, along the third direction F3, a portion of at least one of the groove, the through hole 23a, and the notch passing through the third direction F3 is provided, and the size along the third direction F3 is smaller than the size of other portions, and the first welding portion 231a is located in this portion, so that the thickness of the portion to be welded and fixed by welding is smaller than the thickness of other portions, which facilitates heat to penetrate the first welding portion 231a more quickly during the welding operation and achieve melting faster.

[0210] In this way, on the basis of improving the current-carrying capacity of the first busbar 20, the welding thickness of the first busbar 20 to the first electrode lead-out portion 11 can be reduced, which is beneficial to improving the operating efficiency of welding and fixing the first busbar 231 and the first electrode lead-out portion 11, and is also beneficial to improving the welding quality and improving the stability of the fixation of the electrode lead-out portion and the busbar.

[0211] In some embodiments, the second bus bar 232 is located on a side of the first bus bar 231 away from the first electrode lead portion 11 , which is also helpful in determining the position of the first welding portion 231 a during the welding operation.

[0212] In some embodiments, see Figures 17 to 19 The first busbar 20 also includes a third busbar 234, which is located on the side of the second busbar 232 away from the first busbar 231 along the 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 the second direction F2 and is used to bend and connect the second busbar 232 and the third busbar 234.

[0213] The first bending portion 233 and the second bending portion 235 have opposite bending directions. During the manufacturing process of the first busbar 20, two different areas 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 bent and deformed areas forms the second busbar 232. One side of the bent and deformed area away from the second busbar 232 forms the first busbar 231, and the other side of the bent and deformed area away from the second busbar 232 forms the third busbar 234.

[0214] In this way, the first busbar 20 including three stacked busbars 23 is formed by a reciprocating bending method, which simplifies the processing technology and is conducive to improving production efficiency.

[0215] In some embodiments, see Figures 17 to 19The battery cell assembly 10 also includes a first electrode lead-out portion 11, a first busbar 231 is welded to the first electrode lead-out portion 11 to form a first welding portion 231a, and at least one of the second busbar 232 and the third busbar 234 is provided with at least one of a groove, a through hole 23a, and a notch passing through along the third direction F3 at a portion overlapping with the projection of the first welding portion 231a along the third direction F3.

[0216] In this way, the thickness of the first current bus 20 required for welding with the first electrode lead-out portion 11 can be reduced, thereby improving welding efficiency and welding quality.

[0217] In some embodiments, see Figures 17 to 16 The second busbar 232 and the third busbar 234 are both provided with through holes 23a in the portions that overlap with the projection of the first welding portion 231a along the third direction F3. 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.

[0218] The through hole 23a on the third busbar 234 and the through hole 23a on the second busbar 232 are connected to each other. During the welding process, the welding equipment can directly weld the first welding part 231a through the through hole 23a on the third busbar 234 and the through hole 23a on the second busbar 232 in sequence.

[0219] In this way, when the first busbar 20 includes three layers of busbars 23, it is convenient to perform welding operations on the first welding portion 231a through the through hole 23a, thereby improving the efficiency of welding and fixing the first busbar 231 and the first electrode lead-out portion 11, and also helping to improve the welding quality and the stability of the fixation between the electrode lead-out portion and the busbar.

[0220] In some embodiments, see Figures 17 to 16 The second busbar 232 and the third busbar 234 are both provided with through notches in the portions that overlap with the projection of the first welding portion 231a along the third direction F3. 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.

[0221] In this way, when the first busbar 20 includes three layers of busbars 23, it is convenient to perform welding operations on the first welding portion 231a through the through-notch, thereby improving the efficiency of welding and fixing the first busbar 231 and the first electrode lead-out portion 11, and also helping to improve the welding quality and the stability of the fixation between the electrode lead-out portion and the busbar.

[0222] It can be understood that in an embodiment where the number of stacked busbars 23 in the first busbar 20 is not less than 3, two adjacent busbars 23 along the third direction F3 are connected by a bent portion formed by bending, and the two adjacent bent portions along the third direction F3 are located at opposite ends of the busbar 23 along the second direction F2, and 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 connected to each other along the third direction F3.

[0223] In some embodiments, see Figure 6 、 Figures 9 to 12 、 Figures 20 to 21 The distance between the two points on the outer contours of the first busbar 20 and the outer contours of the second busbar 21 connected to the same battery cell assembly 10 that are farthest apart along the second direction F2 is less than or equal to one-quarter the dimension of the first wall 10a along the second direction F2. That is, L1 ≤ 0.25*L2.

[0224] In this way, the arrangement of the first busbar 20 and the second busbar 21 along the second direction F2 is made 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 .

[0225] In some embodiments, see Figure 20 The battery cell assembly 10 also includes a first electrode lead-out portion 11. The first bus 20 is used to electrically connect the first electrode lead-out portions 11 on two battery cell assemblies 10 adjacent to each other 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 the two battery cell assemblies 10 adjacent to each other along the first direction F1 at least partially overlap. The first bus 20 electrically connects the overlapping portions of the projections of the two first electrode lead-out portions 11.

[0226] The polarities of the two electrode lead-out portions electrically connected to the first current bus 20 may be the same or different.

[0227] The projections of the first electrode lead portions 11 on two adjacent battery cell assemblies 10 at least partially overlap, indicating that at least portions of the two are directly oppositely disposed along the first direction F1 , thereby minimizing the distance between the two along the first direction F1 .

[0228] In this way, it is beneficial to reduce the size of the first busbar 20 along the first direction F1, which is beneficial to reducing the resistance of the first busbar 20; it is beneficial to make the arrangement of each first electrode lead-out portion 11 more compact after the multiple battery cell assemblies 10 are arranged in groups; it is beneficial to increase the contact area between the first busbar 20 and the first electrode lead-out portion 11 when the first busbar 20 extends along the first direction F1, which is beneficial to reducing the resistance of the first busbar 20.

[0229] In some embodiments, see Figure 20 The first busbar 20 and the second busbar 21 are both located on one side of the center line c1 of the first wall 10 a along the second direction F2 .

[0230] The center line c1 of the first wall surface 10a along the second direction F2 refers to a line formed by points on the first wall surface 10a that are equidistant from two ends of the first wall surface 10a along the second direction F2.

[0231] Since the first busbar 20 and the second busbar 21 are located on the center line c1 of the first wall 10a along the second direction F2, the areas of the first wall 10a located on both sides of the first busbar 20 and the second busbar 21 along the second direction F2 are different in size.

[0232] In this way, it is more conducive to forming a large regular area on the first wall 10 a so that other components in the battery device 100 can be arranged in this area, which is conducive to improving the space utilization inside the battery device 100 .

[0233] In some embodiments, see Figure 20 The first wall 10a includes a first edge 10b and a second edge 10c opposite to each other along the second direction F2, and the maximum distance from the one of the first busbar 20 and the second busbar 21 that is farther from the first edge 10b to the first edge 10b is less than one quarter of the maximum distance between the first edge 10b and the second edge 10c.

[0234] The first edge 10b refers to a boundary of one end of the first wall surface 10a along the second direction F2; the second edge 10c refers to a boundary of the other end of the first wall surface 10a along the second direction F2.

[0235] The maximum distance from the first busbar 20 or the second busbar 21 , whichever is farther from the first edge 10 b , to the first edge 10 b is L6 ; the maximum distance between the first edge 10 b and the second edge 10 c is L7 ; L6 < 0.25*L7 .

[0236] In this way, the first busbar 20 and the second busbar 21 are offset on the first wall 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, which is beneficial to improving the space utilization of the battery device 100.

[0237] In some embodiments, see Figure 21 、 Figure 22 、 Figure 24 and Figure 25The battery cell assembly 10 also 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 extending portion 112. The first connecting portion 111 is used to connect to the first busbar 20. The first extending 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 extending portion 112 protrudes from the first connecting portion 111 along the first direction F1. The first extending portion 112 is used to electrically connect to the first electrode tab 14 inside the battery cell assembly 10.

[0238] It can be understood that the larger the size of the first electrode lead-out portion 11 along the second direction F2, the smaller the resistance of the electrical connection between it and the first busbar 20, and 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 electrode tab 14 and the first electrode lead-out portion 11.

[0239] In this way, by dividing the first electrode lead-out portion 11 into the first connecting portion 111 and the first extending portion 112, it is beneficial to extend the first connecting portion 111 electrically connected to the first busbar 20 along the second direction F2 to reduce resistance. At the same time, it is beneficial to extend the first extending portion 112 electrically connected to the second pole tab 15 along the first direction F1 to improve the stability of electrical conduction between the first electrode lead-out portion 11 and the first pole tab 14.

[0240] In some embodiments, see Figure 21 、 Figure 22 、 Figure 24 and Figure 25 The battery cell assembly 10 also includes a second electrode lead-out portion 12, which includes a second connecting portion 121 and a second extending portion 122. The second connecting portion 121 is used to connect to the second bus 21, and the second extending 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, and the second extending portion 122 protrudes from the second connecting portion 121 along the first direction F1. The second extending portion 122 is used to electrically connect to the second electrode tab 15 inside the battery cell assembly 10.

[0241] It can be understood that the larger the size of the second electrode lead-out portion 12 along the second direction F2, the smaller the resistance of the electrical connection between it and the second busbar 21, and 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 electrode tab 15 and the second electrode lead-out portion 12.

[0242] In this way, by dividing the second electrode lead-out portion 12 into the second connection portion 121 and the second extension portion 122, it is beneficial to extend the second connection portion 121 electrically connected to the second busbar 21 along the second direction F2 to reduce resistance. At the same time, it is beneficial to extend the second extension portion 122 electrically connected to the second pole tab 15 along the second direction F2 to improve the stability of electrical conduction between the second electrode lead-out portion 12 and the second pole tab 15.

[0243] In some embodiments, see Figure 21 and Figure 22 The first connection portion 111 and the second connection portion 121 are spaced apart from each other along the first direction F1 , and at least a portion of the first connection portion 111 and at least a portion of the second connection portion 121 are located between the first extension portion 112 and the second extension portion 122 .

[0244] In this way, the arrangement of the first electrode lead-out portion 11 and the second electrode lead-out portion 12 is more centralized and compact.

[0245] A specific embodiment of the battery device 100 in the present invention is as follows:

[0246] 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 arranged on a first wall 10a of the battery cell assembly 10. The first busbar 20 and the second busbar 21 are both used to electrically connect two battery cell assemblies 10 adjacent to each other along the first direction F1. The distance between the two farthest points of the outer contours of the two battery cell assemblies along the second direction F2 is less than or equal to the distance between the first wall 10a along the second direction F1. 2, the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other, the third direction F3 is perpendicular to the first wall 10a, at least one of the first bus 20 and the second bus 21 includes three bus plates 23 stacked along the third direction F3, the box body 30 includes a box wall 31, the box wall 31 is surrounded to form an installation space 30a, the battery cell assembly 10 is arranged in the installation space 30a, a part of the box wall 31 is recessed to form an accommodating space 31a, at least a portion of the first bus 20 and at least a portion of the second bus 21 are accommodated in the accommodating space 31a. 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 within the projection of the accommodation space 31a. The battery cell assembly 10 also includes a first electrode lead portion 11 and a second electrode lead portion 12, both located on the first wall 10a. On the same battery cell assembly 10, the distance between the two points of the outer contours of the first electrode lead portion 11 and the second electrode lead portion 12 that are farthest apart along the second direction F2 is less than or equal to half the dimension of the first wall 10a along the second direction F2. At least a portion of the first electrode lead portion 11 and at least a portion of the second electrode lead portion 12 are accommodated within the accommodation space 31a. When projected along the third direction F3 onto a projection plane perpendicular to the third direction F3, the projections of the first electrode lead portion 11 and the second electrode lead portion 12 are both completely within the projection range of the accommodation space 31a. A portion of the box wall 31 protrudes along its thickness to form a protrusion 311, with the accommodation space 31a located within the protrusion 311. On the same battery cell assembly 10, the first manifold 20 and the second manifold 21 are spaced apart along the first direction F1. On the same battery cell assembly 10, the first projection area is the projection of the first manifold 20 along the third direction F3 onto a plane perpendicular to the third direction F3, and the second projection area is the projection of the second manifold 21 along the third direction F3 onto a plane perpendicular to the third direction F3. The projections of the first and second projection areas completely overlap. The battery device 100 also includes a sampling assembly 40 and a pressure relief mechanism 13. The sampling assembly 40 is located on the first wall 10a and on the same side of the first manifold 20 and the second manifold 21 along the second direction F2.The pressure relief mechanism 13 is located on the first wall 10a along the second direction F2, 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 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 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 busbars 23 is greater than 1 mm and less than 2 mm. There are three layers of busbars 23 stacked on the first busbar 20 along the third direction F3. 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 the 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 welding portion 231a. The first bending portion 233 is located at one end of the first busbar 20 along the 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. Through holes 23a are provided in the portions of the second and third busbars 232 and 234 that overlap with the projections of 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 through holes 23a on the third busbar 234 at least partially oppose each other. The first busbar 20 is used to electrically connect the first electrode lead portions 11 of 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 portions 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 projections of the two first electrode lead portions 11. Both the first and second busbars 20 and 21 are located on one side of the centerline c1 of the first wall 10a along the second direction F2. The first wall 10a includes a first edge 10b and a second edge 10c opposite to each other along the second direction F2, and the maximum distance from the one of the first busbar 20 and the second busbar 21 that is farther from the first edge 10b to the first edge 10b 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 extending portion 112. The first connecting portion 111 is used to connect to the first bus 20. The first extending 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 extending portion 112 protrudes from the first connecting portion 111 along the first direction F1. The first extending portion 112 is used to electrically connect to the first pole ear 14 inside the battery cell assembly 10. The second electrode lead-out portion 12 includes a second connecting portion 121 and a second extending portion 122. The second connecting portion 121 is used to connect to the second bus 21. The second extending 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. In addition, the second extending portion 122 protrudes from the second connecting portion 121 along the first direction F1. The second extension 122 is used to electrically connect to the second pole ear 15 inside the battery cell assembly 10.

[0247] An embodiment of the present invention further provides an electrical device, which includes the battery device 100 in any of the aforementioned embodiments. The battery device 100 serves as a power source for the electrical device.

[0248] In this way, the compact structure of the battery device 100 can help improve the compactness of the arrangement of other components in the electrical device and improve space utilization.

[0249] In some embodiments, the electric device may be a vehicle 1000, see Figure 26 and Figure 27 The vehicle 1000 includes a vehicle frame 400 and the battery device 100 in the aforementioned embodiment. The battery device 100 is arranged on the vehicle frame 400. The battery device 100 includes a box wall 31. The box wall 31 is arranged to form an installation space 30a. The battery cell assembly 10 is arranged in the installation space 30a. A portion of the box wall 31 is recessed to form an accommodating space 31a. At least a portion of the first busbar 20 and / or at least a portion of the second busbar 21 is accommodated in the accommodating space 31a. A portion of the box wall 31 protrudes along the wall thickness direction to form a convex portion 311, and the accommodating space is located in the convex portion 311. A portion of the box wall 31 protrudes along the wall thickness direction to form a convex portion 311, and the accommodating space is located in the convex portion 311. A recess 400a is provided in the vehicle frame 400, and at least a portion of the convex portion 311 extends into the recess 400a.

[0250] The vehicle frame 400 refers to a frame structure in the vehicle 1000 formed by splicing multiple beams.

[0251] The battery device 100 and the vehicle frame 400 may be fixedly connected or detachably connected to facilitate maintenance and replacement of the battery device 100 .

[0252] In this way, through the cooperation between the concave portion 400 a and the convex portion 311 , a portion of the battery device 100 can utilize the space of the vehicle frame 400 , thereby improving the space utilization of the vehicle and increasing the capacity of the battery device 100 in the vehicle 1000 .

[0253] In some embodiments, participation Figure 27 The protrusion 311 protrudes along the third direction F3, and the frame 400 includes a mounting beam 410, which is provided on one side of the battery device 100 along the third direction F3. The mounting beam 410 is provided with a slot 410a, and the slot 410a is open along the third direction F3 toward one 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.

[0254] The mounting beam 410 refers to a beam structure in the vehicle frame 400 that can be used to mount other components in the vehicle 1000 , such as a beam structure for mounting seats, a center console, a door body, etc.

[0255] In this way, the utilization rate of the internal space of the mounting beam 410 can be improved, 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 enable the protrusion 311 to enter the groove 410a through the opening, simplifying the assembly steps.

[0256] It will be appreciated that the slot 410a forms at least a portion of the recess 400a.

[0257] The specific method of forming the groove 410 a of the mounting beam 410 is not limited. For example, the groove 410 a is formed on the inner side of a raised structure formed by bending a plate multiple times.

[0258] In some embodiments, see Figure 26 and Figure 27 The box wall 31 formed with the convex portion 311 is configured as the passenger compartment floor 420 of the vehicle 1000, and the convex portion 311 faces the passenger compartment 400b.

[0259] The passenger compartment floor 420 refers to a bottom plate for forming the passenger compartment 400 b of the vehicle 1000 .

[0260] In this way, the redundant space in the passenger compartment 400 b is utilized, the space utilization rate inside the vehicle 1000 is improved, and the capacity of the battery device 100 in the vehicle 1000 is increased.

[0261] In some embodiments, see Figure 27 and Figure 29The vehicle 1000 further includes a mounting beam 410 disposed along a third direction F3 on a side of the passenger compartment floor 420 facing away from the battery device 100. The mounting beam 410 is provided with a slot 410a. The slot 410a is open along the third direction F3 toward a 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.

[0262] At least a portion of the mounting beam 410 is located within the passenger compartment 400 b so as to enable the installation of components such as a center console and seats.

[0263] In this way, by utilizing the space in the slot 410 a , the space in the recess 400 a is increased, thereby increasing the volume of the redundant space of the battery device 100 in the passenger compartment, thereby improving the space utilization rate inside the vehicle 1000 .

[0264] In other embodiments where the electric device is a vehicle 1000, see Figure 28 and Figure 29 The vehicle 1000 includes a passenger compartment floor 420 and the battery 100 of any one of the aforementioned embodiments. The passenger compartment floor 420 is provided with a recessed portion 400a 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 recessed portion 400a. Along the third direction F3, the passenger compartment floor 420 protrudes on a side away from the battery 100 to form a first protrusion 421 so as to be recessed on the surface facing the battery 100 to form the recessed portion 400a.

[0265] That is, the box wall 31 and the passenger compartment floor 420 are overlapped along the third direction F3, that is, the box wall 31 and the passenger compartment floor 420 are different parts.

[0266] The various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction.

[0267] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A battery device, characterized in that: include: a plurality of battery cell assemblies arranged along a first direction; A first busbar and a second busbar are provided on a first wall surface of the battery cell assembly, wherein the first busbar and the second busbar are both used to electrically connect two battery cell assemblies adjacent to each other along the first direction. Among them, the first busbar and the second busbar connected to the same battery cell assembly have an outer contour whose distance between the two points farthest apart along the second direction is less than or equal to half of the size of the first wall along the second direction; at least one of the first busbar and the second busbar includes at least two busbars and the at least two busbars are stacked along the third direction, and two adjacent busbars are connected to each other at at least one end 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.

2. The battery device according to claim 1, wherein: The battery device includes a box body, the box body includes a box wall, the box wall is arranged to form an installation space, the battery cell assembly is arranged in the installation space, a portion of the box wall is recessed to form a accommodating space, at least part of the first busbar and / or at least part of the second busbar is accommodated in the accommodating space.

3. The battery device according to claim 2, characterized in that In a projection plane perpendicular to the third direction, a projection of the first current collector and a projection of the second current collector are completely located in a projection of the accommodating space.

4. The battery device according to claim 1, wherein: The battery cell assembly also includes a first electrode lead-out portion and a second electrode lead-out portion, both of which are arranged on the first wall surface. On the same battery cell assembly, the distance between the two points of the outer contour of the first electrode lead-out portion and the outer contour of the second electrode lead-out portion that are farthest apart along the second direction is less than or equal to half of the size of the first wall surface along the second direction.

5. The battery device according to claim 4, characterized in that The battery device includes a box body, the box body includes a box wall, the box wall is arranged to form an installation space, the battery cell assembly is arranged in the installation space, a portion of the box wall is recessed to form an accommodation space, at least part of the first electrode lead-out portion and / or at least part of the second electrode lead-out portion is accommodated in the accommodation space.

6. The battery device according to claim 5, characterized in that When projected along the third direction onto a projection plane perpendicular to the third direction, a projection of the first electrode lead portion and a projection of the second electrode lead portion are both completely located within a projection range of the accommodating space.

7. The battery device according to claim 3 or 6, characterized in that: A portion of the box wall protrudes along a wall thickness direction to form a convex portion, and the accommodating space is located in the convex portion.

8. The battery device according to claim 1, wherein: On the same battery cell assembly, the first busbars and the second busbars are arranged at intervals along a first direction.

9. The battery device according to claim 8, characterized in that On the same battery cell assembly, the first projection area is a projection of the first busbar along the third direction onto a projection plane perpendicular to the third direction, and the second projection area is a 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 plane perpendicular to the first direction, 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, characterized in that The battery cell assembly also 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 connecting portion, the first busbar is connected to the first connecting portion, the second electrode lead-out portion includes a second connecting portion, the second busbar is connected to the second connecting portion, and the first connecting portion and the second connecting portion are arranged at intervals along the first direction.

11. The battery device according to claim 1, wherein: The battery device further includes a sampling assembly, which is located on the first wall surface. Along the second direction, the sampling assembly is located on the same side of the first current collector and the second current collector.

12. The battery device according to claim 1, wherein: The battery cell assembly further includes a pressure relief mechanism, which is located on the first wall surface and on the same side of the first busbar and the second busbar along the second direction.

13. The battery device according to claim 1, wherein: The maximum dimension of the first busbar along the second direction is less than or equal to one-fourth 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 layers of busbars 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 claim 1, 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 busbars located on the first busbar and stacked along the third direction is 3 layers.

15. The battery device according to claim 13 or 14, characterized in that: 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 claim 1, wherein: The first busbar includes at least a first busbar and a second busbar, and the first busbar and the second busbar are stacked along the third direction. The first busbar also includes a first bending portion, which is located at one end of the first busbar along the second direction and is used to bend and connect the first busbar and the second busbar.

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

18. The battery device according to claim 16, wherein: The first busbar also 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 bending portion, 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 also includes a first electrode lead-out portion, the first busbar is welded to the first electrode lead-out portion to form a first welding portion, and at least one of the second busbar and the third busbar is provided with at least one of a groove, a through hole, and a notch extending along the third direction at a portion overlapping with the projection of the first welding portion along the third direction.

20. The battery device according to claim 19, wherein: The second busbar and the third busbar are both provided with through holes in portions that overlap with the projection of the first welding portion along the third direction, 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; Alternatively, the second busbar and the third busbar are both provided with through notches in portions overlapping with the projection of the first welding portion along the third direction, and along the third direction, the notch on the second busbar and the notch on the third busbar are at least partially opposite.

21. The battery device according to claim 1, wherein: The distance between two points of the outer contours of the first busbar and the second busbar connected to the same battery cell assembly that are farthest 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 claim 1, wherein: The battery cell assembly also includes a first electrode lead-out portion, and the first bus is used to electrically connect the first electrode lead-out portions on two battery cell assemblies adjacent to each other along the first direction. In a projection plane perpendicular to the first direction, the projections of the first electrode lead-out portions on the two battery cell assemblies adjacent to each other along the first direction at least partially overlap, and the first bus electrically connects the overlapping portions of the projections of the two first electrode lead-out portions.

23. The battery device according to claim 1, wherein: The first current collector and the second current collector are both located on one side of a center line of the first wall surface along the second direction.

24. The battery device according to claim 23, characterized in that The first wall includes a first edge and a second edge opposite to each other along the second direction, and a maximum distance from one of the first and second busbars farther from the first edge to the first edge is less than a quarter of a maximum distance between the first and second edges.

25. The battery device according to claim 1, 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 including a first connecting portion and a first extending portion, the first connecting portion being used to connect to the first busbar, the first extending portion being located at an end of the first connecting portion away from the second electrode lead-out portion along the second direction, the first extending portion protruding from the first connecting portion along the first direction, the first extending portion being used to electrically connect to a first electrode tab inside the battery cell assembly, and / or, The second electrode lead-out portion includes a second connecting portion and a second extending portion, the second connecting portion is used to connect the second bus bar, the second extending portion is located at one end of the second connecting portion away from the first electrode lead-out portion along the second direction, and the second extending portion protrudes beyond the second connecting portion along the first direction, and the second extending portion is used to electrically connect to the second pole ear inside the battery cell assembly.

26. An electrical device, characterized in that: The electrical device includes the battery device according to any one of claims 1 to 25, and the battery device serves as a power source for the electrical device.

27. The electrical device according to claim 26, characterized in that: The electrical device is a vehicle, which also includes a frame. The battery device is arranged on the frame. The battery device includes a box wall, which is arranged to form an installation space. The battery cell assembly is arranged in the installation space. A portion of the box wall is recessed to form an accommodating space. At least a portion of the first busbar and / or at least a portion of the second busbar is accommodated in the accommodating space. A portion of the box wall protrudes along the wall thickness direction to form a convex portion. The accommodating space is located in the convex portion. A concave portion is provided in the frame, and at least a portion of the convex portion extends into the concave portion.

28. The electrical device according to claim 27, characterized in that: The protrusion protrudes along the third direction, and the frame includes a mounting beam provided on one side of the battery device along the third direction. The mounting beam is provided with a slot, and the slot is open along the third direction toward the side of the battery device to form an opening, and at least a portion of the protrusion extends into the slot through the opening.

29. The electrical device according to claim 27, characterized in that: The box wall formed with the convex portion is configured as a passenger compartment floor of the vehicle, and the convex portion faces the passenger compartment.

30. The electrical device according to claim 29, characterized in that: The vehicle also includes a mounting beam arranged along the third direction on the side of the passenger compartment floor away from the battery device, the mounting beam is provided with a slot, the slot is open along the third direction toward the side of the passenger compartment floor to form an opening, and at least a portion of the protrusion extends into the slot through the opening.

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