Battery device, electric device, and energy storage device

Abstract

A battery device, an electric device, and an energy storage device. The battery device comprises a battery cell group and a sampling assembly; the battery cell group comprises at least two battery cells arranged in a first direction; the battery cells each comprise a casing and an electrode terminal; the casing comprises a pair of first casing walls arranged opposite to each other in a second direction; part of one first casing wall is provided with a recessed portion in the second direction, and the electrode terminal is provided in the recessed portion; in the second direction, the sampling assembly is provided on the side of the battery cell group where the recessed portion is formed, and the sampling assembly is electrically connected to the electrode terminal of each battery cell; and the recessed portion is located at one end or two ends of the casing in a third direction.

Description

Battery devices, electrical devices and energy storage devices

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202510005474.3, filed on January 2, 2025, entitled “Battery Device, Power Consumption Device and Energy Storage Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and in particular to a battery device, an electrical device, and an energy storage device. Background Technology

[0004] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with battery devices are already widely used. In addition, battery devices are being increasingly used in the field of energy storage.

[0005] With the continuous development of battery technology, how to improve the energy density of battery devices has become one of the research topics in the industry. Summary of the Invention

[0006] To address the aforementioned technical problems, this disclosure provides a high-energy-density battery device, an electrical device, and an energy storage device.

[0007] This disclosure is achieved through the following technical solution.

[0008] A first aspect of this disclosure provides a battery device including a battery cell assembly and a sampling assembly. The battery cell assembly includes at least two battery cells arranged along a first direction. Each battery cell includes a housing and electrode terminals. The housing includes a pair of first housing walls disposed opposite each other along a second direction. A portion of one of the first housing walls has a recess along the second direction, and the electrode terminals are disposed in the recess. Along the second direction, the sampling assembly is disposed on the side of the battery cell assembly where the recess is formed, and the sampling assembly is electrically connected to the electrode terminals of each battery cell. The recess is located at one or both ends of the housing along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other, with the third direction being the length direction of the battery cell.

[0009] Because the first housing wall has a recess along the second direction, and the electrode terminals are accommodated within the recess, the space occupied by the electrode terminals in the second direction is reduced, thus improving the space utilization rate of the battery cell. Furthermore, the electrode terminals do not occupy the space on the third-direction upward sides of the housing. By reducing the space occupied by the battery cells in the second and third-direction upward directions, the space utilization rate of the battery cells and the battery device is improved, thereby contributing to increasing the energy density of the battery device.

[0010] In addition, the battery device includes a sampling component that can collect information by electrically connecting to the electrode terminals located in the recess. The sampling component is located on the side of the battery cell assembly where the recess is formed along the second direction. This allows the sampling component to be arranged in a way that makes full use of the space saved by the battery cells along the second direction, without the need to reserve additional space for the sampling component. This makes the layout of the various components in the battery device more reasonable, which is conducive to improving space utilization and thus improving the energy density of the battery device.

[0011] In some embodiments, the recess is located at one end of the housing along a third direction, and the recesses of each battery cell in a battery cell group are all located on the same side along a third direction.

[0012] Because the recess is formed at one end of the casing along a third direction, it saves the space that would otherwise be reserved along the entire length of the battery cell for setting electrode terminals. This saved space can be used to arrange components such as sampling assemblies. In addition, since the recesses of all battery cells in the battery cell group are located on the same side, it is easier for external conductive components to electrically connect the individual battery cells in the battery cell group.

[0013] In some embodiments, the recess is configured to extend through a first direction, and the first housing wall includes a first segment, a second segment, and a third segment connected in sequence. Along a second direction, the third segment is recessed toward the interior of the housing relative to the first segment, and the second and third segments form the recess. An electrode terminal is disposed on the third segment.

[0014] Since the recessed portion is configured to be through along the first direction, when multiple battery cells are arranged and stacked along the first direction, the recessed portions of each battery cell can be connected to each other, thereby facilitating the electrical connection between the electrode terminals of each battery cell and the external conductive structure, and realizing the electrical connection of each battery cell in the battery cell group.

[0015] In some embodiments, the projection of the electrode terminal falls within the projection range of the second segment in a projection plane perpendicular to a third direction.

[0016] Since the projection of the electrode terminal falls within the projection range of the second segment, when viewed along the third direction, the electrode terminal does not protrude from the first segment of the first housing wall, thus not increasing the size of the battery cell in the second direction, and is less likely to interfere with the arrangement of external components, which is conducive to improving the energy density of the battery cell.

[0017] In some embodiments, the battery device further includes a busbar, wherein two adjacent battery cells in a battery cell group are connected in series via the busbar; the sampling assembly includes a sampling element and a sampling terminal, wherein the sampling terminal is connected to the sampling element and the busbar.

[0018] Therefore, the busbar can be used to achieve electrical connection between adjacent battery cells, and the sampling component is connected to the busbar, thereby improving the accuracy of the sampling component in obtaining battery cell information.

[0019] In some embodiments, the sampling member extends along a first direction, and in a projection plane perpendicular to a second direction, the projection of the sampling member at least partially falls within the projection range of the recess.

[0020] Therefore, the sampling component is a strip structure extending along the first direction, and the direction of extension is the same as the stacking direction of the battery cells in the battery cell group. This makes it easier for the sampling component to collect information of each battery cell in the battery cell group, which is beneficial to improving the sampling range of the sampling component and improving the reliability of the sampling component during sampling.

[0021] In some embodiments, in a projection plane perpendicular to the second direction, the projection of the sample falls completely within the projection range of the recess, and in a projection plane perpendicular to the third direction, the projection of the sample falls within the projection range of the second segment.

[0022] Therefore, the sampling component can be accommodated in the recess, thus making full use of the space in the recess. This makes the overall structure of the battery cell assembly with the sampling component more compact, reduces the space occupied by the battery cell assembly with the sampling component in the second direction, and further increases the space utilization rate within the battery device, thereby improving the energy density of the battery device.

[0023] In some embodiments, the sampling terminal includes a first part, a second part, and a third part connected in sequence, wherein the extension direction of the second part intersects the extension directions of the first part and the third part, and the extension directions of the first part and the second part are the same; the first part is connected to the sampling element, and the third part is connected to the busbar.

[0024] Therefore, by bending the sampling terminal, the sampling device can be connected to the busbar through the sampling terminal, thereby improving the accuracy of the sampling device in obtaining information about individual battery cells.

[0025] In some embodiments, the battery device further includes a heat insulation element located between the sampling element and the busbar.

[0026] During charge-discharge cycles, individual battery cells generate heat, which is conducted to the busbar and then to the sampling module. Because a heat insulation element is installed between the sampling module and the busbar, it provides protection, reducing the possibility of the sampling module expanding and being damaged due to excessive heat. This improves the sampling reliability and lifespan of the sampling module, and helps reduce production costs.

[0027] In some embodiments, the sampling member extends along a first direction and is disposed on a first segment of the first housing wall.

[0028] Therefore, the sampling component is a strip structure extending along the first direction, and the direction of extension is the same as the stacking direction of the battery cells in the battery cell group. This makes it easier for the sampling component to collect information of each battery cell in the battery cell group, which is beneficial to improving the sampling range of the sampling component and improving the reliability of the sampling component during sampling.

[0029] In addition, the sampling device is located on the relatively flat first section, which makes it easier to install the sampling device and helps to improve the reliability of the sampling device during sampling.

[0030] In some embodiments, the sampling terminal includes a first part, a second part, and a third part connected in sequence, wherein the extension direction of the second part intersects the extension directions of the first part and the third part, and the extension directions of the first part are opposite to those of the second part; the first part is connected to the sampling element, and the third part is connected to the busbar.

[0031] Therefore, by bending the sampling terminal, the sampling device can be connected to the busbar through the sampling terminal, thereby improving the accuracy of the sampling device in obtaining information about individual battery cells.

[0032] In some embodiments, the electrode terminals include a first electrode terminal and a second electrode terminal with opposite polarities; the busbar includes a first segment, a second segment and a third segment connected in sequence, and along a second direction, the second segment is recessed relative to the first segment and the third segment toward the housing; the first segment is connected to the first electrode terminal of a battery cell, the third segment is connected to the second electrode terminal of another battery cell adjacent to the battery cell along a first direction, and the sampling terminal is connected to the sampling element and the second segment.

[0033] Therefore, the recessed second section of the busbar provides sufficient installation space for the sampling terminal, allowing the sampling device to better sample the battery cells through the sampling terminal. Furthermore, the recessed design reduces the expansion and deformation of the battery cells during charging and discharging, and lowers the height of the busbar along the second direction, thereby improving the energy density of the battery device.

[0034] In some embodiments, the sampling component includes a sampling plate or a sampling harness.

[0035] Therefore, it is possible to sample battery cells using sampling boards such as flexible circuit boards or wire harnesses, and select different sampling components according to different situations, which helps to improve the layout flexibility within the battery device.

[0036] In some embodiments, the sampling component further includes a connector disposed at one end of the sampling component along a first direction, and the connector is used to output the information collected by the sampling component.

[0037] Therefore, the sampling component can receive and transmit the electrical signals collected by the sampling device through the connector, and send the electrical signals to the battery management system or external circuits, etc.

[0038] In some embodiments, the battery device further includes a housing, in which a group of battery cells is housed; the housing has a clearance groove extending along a first direction, the clearance groove being configured to accommodate a sampling component.

[0039] Therefore, when the battery cell pack is housed in the box, at least part of the sampling component can be housed in the clearance groove of the box, so that the clearance groove can play a certain role in protecting and limiting the sampling component.

[0040] In addition, the sampling component can be placed in a suitable position in the housing through the clearance groove, which helps to reduce the space occupied by the extension of the sampling component, thereby making the structure of the battery device more compact and improving the space utilization of the housing.

[0041] In some embodiments, the dimension of the second segment along the second direction is in the range of 3 mm to 10 mm.

[0042] This ensures that the dimensions of the second segment along the second direction are within a suitable range, allowing the recessed portion to have sufficient size to accommodate the electrode terminals while reducing the space occupied inside the casing, thus balancing the reliability and energy density of the battery cell.

[0043] In some embodiments, the electrode terminal protrudes from the third segment along the second direction by a size ranging from 0.5 mm to 3 mm.

[0044] This ensures that the size of the electrode terminal protruding from the third segment along the second direction is within a suitable range, thereby reducing the possibility of short circuits or other adverse situations caused by contact between the external conductive structure and the casing when connecting the electrode terminal. While not affecting the electrical connection of the external conductive structure to the electrode terminal, the electrode terminal does not extend beyond the recess along the second direction, reducing the size of the battery cell in the second direction, which is beneficial to improving the energy density of the battery cell.

[0045] In some embodiments, the dimension of the third segment along the third direction is in the range of 80 mm to 400 mm.

[0046] This ensures that the dimensions of the third segment along the third direction are within a suitable range, providing sufficient space in the recess to accommodate the two electrode terminals and preventing short circuits between them. Furthermore, it reduces the space occupied within the casing, balancing the reliability and energy density of the battery cell.

[0047] In some embodiments, the size of the battery cell along the first direction is in the range of 10 mm to 35 mm; and / or the size of the battery cell along the second direction is in the range of 80 mm to 130 mm; and / or the size of the battery cell along the third direction is in the range of 300 mm to 1300 mm.

[0048] Therefore, the battery cell is a blade battery. By designing the size of the battery cell to meet the above relationship, it is beneficial to balance the energy density of the battery cell and the stacking efficiency.

[0049] In some embodiments, there are multiple battery cell groups, which are arranged along a third direction; along the third direction, the recesses of two adjacent battery cell groups are arranged opposite to each other or back to each other.

[0050] This allows multiple battery cells to be arranged along a third direction, which helps to further increase the energy density of the battery device.

[0051] A second aspect of this disclosure provides an electrical device that includes a battery device of the first aspect of this disclosure for providing electrical energy.

[0052] Since the electrical device includes the battery device provided in the first aspect of the present disclosure, it is advantageous to improve the energy density and space utilization of the electrical device.

[0053] A third aspect of this disclosure provides an energy storage device, which includes a battery device of the first aspect of this disclosure for storing electrical energy or providing electrical energy.

[0054] Since the energy storage device includes the battery device provided in the first aspect of the present disclosure, it is advantageous to improve the energy density and space utilization of the energy storage device.

[0055] Invention Effects

[0056] This disclosure improves the space utilization rate within the battery device and reduces wasted space within the battery device's casing, thereby contributing to increased energy density of the battery device. Attached Figure Description

[0057] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0058] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0059] Figure 2 is an exploded perspective view of a battery device (sampling components and busbars not shown) provided in some embodiments of this disclosure;

[0060] Figure 3 is a three-dimensional structural diagram of a battery cell pack provided in some embodiments of this disclosure;

[0061] Figure 4 is a three-dimensional structural diagram of a battery cell pack with a busbar provided in some embodiments of the present disclosure;

[0062] Figure 5 is a three-dimensional structural diagram of a battery cell assembly equipped with a sampling component provided in some embodiments of this disclosure;

[0063] Figure 6 is an exploded structural diagram of the battery cell assembly shown in Figure 5 from another perspective.

[0064] Figure 7 is a magnified view of part A in Figure 6;

[0065] Figure 8 is a three-dimensional structural diagram of a battery cell assembly with a sampling component provided in some embodiments of this disclosure;

[0066] Figure 9 is a three-dimensional structural diagram of a battery cell assembly equipped with a sampling component provided in some embodiments of this disclosure;

[0067] Figure 10 is a three-dimensional structural diagram of a battery cell assembly with a sampling component provided in some embodiments of this disclosure;

[0068] Figure 11 is a three-dimensional structural diagram of multiple battery cell packs provided in some embodiments of this disclosure.

[0069] Explanation of reference numerals in the attached drawings: 1. Battery cell; 2. Housing; 21. First housing wall; 211. First section; 212. Second section; 213. Third section; 3. Electrode terminal; 31. First electrode terminal; 32. Second electrode terminal; 4. Recess; 5. Busbar; 51. First section; 52. Second section; 53. Third section; 6. Sampling component; 7. Sampling terminal; 71. First part; 72. Second part; 73. Third part; 8. Connector; 10. Battery cell assembly; 20. Sampling component; 30. Housing; 30a. First housing; 30b. Second housing; 301. Receiving space; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0070] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0073] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0075] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0076] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0077] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0078] The following is a detailed description of this disclosure.

[0079] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0080] With the widespread application of battery devices, the market has placed higher demands on battery devices for high energy density and miniaturization. Therefore, improving the volume utilization and energy density of individual battery cells and battery cell packs is one of the ongoing research topics in the industry.

[0081] In related technologies, the electrode terminals of a battery cell typically protrude from the surface of the battery cell's casing, occupying a large space. Therefore, there is room for further optimization.

[0082] This disclosure addresses the problems existing in the aforementioned related technologies by proposing a battery device, which includes battery cells and a sampling assembly. The battery cell group includes at least two battery cells arranged along a first direction. Each battery cell includes a housing and electrode terminals. The housing includes a pair of first housing walls disposed opposite each other along a second direction. A portion of one of the first housing walls has a recess along the second direction, and the electrode terminals are disposed in the recess. Along the second direction, the sampling assembly is disposed on the side of the battery cell group where the recess is formed, and the sampling assembly is electrically connected to the electrode terminals of each battery cell. The recess is located at one or both ends of the housing along a third direction, and the first, second, and third directions are perpendicular to each other, with the third direction being the length direction of the battery cell.

[0083] Because the first housing wall has a recess along the second direction, and the electrode terminals are housed within the recess, the space occupied by the electrode terminals in the second direction is reduced, thus improving the space utilization rate of the battery cell. Furthermore, the electrode terminals do not occupy space on the third-direction upward sides of the housing. By reducing the space occupied by the battery cells in both the second and third-direction upward directions, the space utilization rate of the battery cells and the battery device is improved, thereby contributing to increased energy density of the battery device.

[0084] In addition, the battery device includes a sampling component that can collect information by electrically connecting to the electrode terminals located in the recess. The sampling component is located on the side of the battery cell assembly where the recess is formed along the second direction. This allows the sampling component to be arranged in a way that makes full use of the space saved by the battery cells along the second direction, without the need to reserve additional space for the sampling component. This makes the layout of the various components in the battery device more reasonable, which is conducive to improving space utilization and thus improving the energy density of the battery device.

[0085] The battery device provided in this disclosure can be used, but is not limited to, in energy storage power systems, vehicles, ships or aircraft, and energy storage devices such as energy storage containers and energy storage cabinets.

[0086] This disclosure provides an electrical device including the aforementioned battery device for providing electrical energy. The electrical device includes, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0087] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this disclosure. The description is as follows, in conjunction with the accompanying drawings.

[0088] Figure 1 is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this disclosure. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. As shown in Figure 1, a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0089] In some embodiments of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to Figures 2 to 11.

[0091] Figure 2 is an exploded perspective view of a battery device (sampling component and busbar not shown) provided in some embodiments of this disclosure; Figure 3 is a perspective view of a battery cell assembly provided in some embodiments of this disclosure; Figure 4 is a perspective view of a battery cell assembly with a busbar provided in some embodiments of this disclosure; Figure 5 is a perspective view of a battery cell assembly with a sampling component provided in some embodiments of this disclosure (first); Figure 6 is an exploded perspective view of the battery cell assembly shown in Figure 5 from another angle; Figure 7 is a partial enlarged view of point A in Figure 6; Figure 8 is a perspective view of a battery cell assembly with a sampling component provided in some embodiments of this disclosure (second); Figure 9 is a perspective view of a battery cell assembly with a sampling component provided in some embodiments of this disclosure (third); Figure 10 is a perspective view of a battery cell assembly with a sampling component provided in some embodiments of this disclosure (fourth); Figure 11 is a perspective view of multiple battery cell assemblies provided in some embodiments of this disclosure.

[0092] In some embodiments of this disclosure, for ease of explanation, a first direction, a second direction, and a third direction are defined. These three directions are perpendicular to each other. However, those skilled in the art should understand that the embodiments of this disclosure are not limited to the case where these three directions are perpendicular to each other. For ease of explanation, as shown by the arrows in Figures 3 to 6 and Figures 8 to 11, the direction indicated by arrow X is the first direction, the direction indicated by arrow Y is the second direction, and the direction indicated by arrow Z is the third direction. Sometimes, the first direction is also referred to as the thickness direction of the battery cell, the second direction as the height direction of the battery cell, and the third direction as the length direction of the battery cell. Sometimes, the direction indicated by arrow Z is also referred to as "above," and its opposite direction as "below."

[0093] The first aspect of this disclosure provides a battery device 100, which includes a battery cell assembly 10 and a sampling component 20. The battery cell assembly 10 includes at least two battery cells 1 arranged along a first direction. Each battery cell 1 includes a housing 2 and electrode terminals 3. The housing 2 includes a pair of first housing walls 21 disposed opposite each other along a second direction. A portion of one of the first housing walls 21 has a recess 4 along the second direction, and the electrode terminals 3 are disposed in the recess 4. Along the second direction, the sampling component 20 is disposed on the side of the battery cell assembly 10 where the recess 4 is formed, and the sampling component 20 is electrically connected to the electrode terminals 3 of each battery cell 1. The recess 4 is located at one or both ends of the housing 2 along a third direction, where the first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is the length direction of the battery cell 1.

[0094] The battery device 100 mentioned in the embodiments of this disclosure may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly 10 may include a plurality of battery cells 1, which are connected in series, parallel or mixed connection via a busbar 5.

[0095] In some embodiments, the battery cell group 10 is typically formed by arranging a plurality of battery cells 1.

[0096] As an example, the battery cell group 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 1 to form an independent module. As an example, the battery module can be formed by binding multiple battery cells 1 together with cable ties.

[0097] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 30 and one or more battery cell groups 10, the battery cell groups 10 being housed in the housing 30.

[0098] As an example, the battery cell pack 10 can be a battery module, and the battery cell pack 10 can be housed in the housing 30 by fixing the battery module in the housing 30.

[0099] As an example, the battery cell pack 10 can also be housed in the housing 30 by directly fixing multiple battery cells 1 to the housing 30.

[0100] In this embodiment of the disclosure, the battery cell 1 can be a secondary battery, which refers to the battery cell 1 that can be recharged to activate the active materials and continue to be used after the battery cell 1 has been discharged.

[0101] The battery cell 1 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment does not limit it.

[0102] As shown in Figures 2 and 3, the battery cell 1 includes a housing 2, electrode terminals 3, and electrode assemblies (not shown in the figures).

[0103] The housing 2 can be made of steel, aluminum, plastic (such as polypropylene), or composite metal (such as copper-aluminum composite). The housing 2 can be a sealed structure or a non-sealed structure.

[0104] As an example, when the housing 2 is a non-sealed structure, the housing 2 serves to protect the electrode assembly. A sealing bag is also included between the housing 2 and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 2 is a sealed structure, it is used to directly encapsulate the electrode assembly and electrolyte, among other components.

[0105] Although not shown in the figure, the electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of battery cell 1, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the electrodes while allowing active ions to pass through.

[0106] In some embodiments, the positive electrode sheet may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0107] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0108] In some embodiments, the negative electrode may include a negative current collector.

[0109] In some embodiments, the separator is a separator membrane. This disclosure does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0110] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0111] In some embodiments, the electrode assembly has tabs (not shown) that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0112] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0113] In some embodiments, the casing 2 of the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0114] Electrode terminal 3 can be, for example, a pole post, and is electrically connected to a tab. Exemplarily, electrode terminal 3 can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector.

[0115] For example, the electrode terminal 3 can be made of one metal material or multiple metal materials, and the metal materials can be, but are not limited to, copper, aluminum, nickel, zinc, iron, etc.

[0116] As shown in Figure 2, the shell 2 includes multiple shell walls, which together enclose a cavity to form the shell, where the electrode assembly, electrolyte, etc. are located.

[0117] For example, multiple shell walls can be formed into a single structure.

[0118] As another example, multiple shell walls can be separate structures and then assembled together by welding, bonding, snap-fitting, etc.

[0119] In this embodiment, the housing 2 is generally rectangular. In some other embodiments, the housing 2 may also be any other suitable shape, such as a cube.

[0120] Specifically, the housing wall includes a pair of first housing walls 21 disposed opposite to each other along a second direction. Sometimes, the first housing wall 21 may also be referred to as the top wall or bottom wall of the housing 2. Of course, those skilled in the art should understand that when the battery cell 1 is laid flat, that is, when the large surface of the battery cell 1 (the housing wall with the largest area) is placed downwards, the first housing wall 21 may also be referred to as the side wall of the housing 2.

[0121] In related technologies, electrode terminals are usually formed protruding on the shell wall of the housing. Therefore, whether multiple electrode terminals are formed on the same shell wall or on different shell walls, they will occupy a certain space along the protruding direction of the electrode terminals.

[0122] In this embodiment, the first housing wall 21 has a recess 4 along the second direction, and the electrode terminal 3 is accommodated within the recess 4. That is, the remaining portion of the first housing wall 21 without the electrode terminal 3 protrudes relative to the electrode terminal 3 along the second direction. Therefore, the space occupied by the electrode terminal 3 in the second direction is reduced, allowing more space to be arranged for other structural components of the battery device 100, thereby improving the space utilization rate of the battery device 100. Moreover, without changing the overall volume of the battery device 100, the volume of the housing 2 of the battery cell 1 can be appropriately increased, thereby accommodating more electrolyte and electrode components, which is beneficial to improving the energy density of the battery cell 1, and thus improving the energy density of the battery device 100.

[0123] Furthermore, since the electrode terminal 3 is located within the recessed portion 4, the possibility of damage to the electrode terminal 3 due to external impacts or vibrations can be reduced, thereby improving the reliability of the battery cell 1.

[0124] The recessed portion 4 can be a recessed structure with a certain depth and shape. For example, the recessed portion 4 can be a pit-like structure, such as a hemispherical pit, a frustum-shaped pit, a pyramidal pit, a cubic pit, etc. As another example, the recessed portion 4 can be a groove-like shape. The recessed portion 4 can be a regular shape or an irregular shape.

[0125] For example, a portion of the first housing wall 21 is recessed in the second direction toward the interior of the housing 2 to form a recess 4.

[0126] In this embodiment, the recess 4 is formed at one end of the housing 2 along a third direction, meaning that both the positive and negative electrode terminals of a single battery cell 1 are located within one recess 4. In some other embodiments, the recess 4 may also be formed at both ends of the housing 2 along a third direction, meaning that the positive and negative electrode terminals of a single battery cell 1 are located within two separate recesses 4. In this embodiment, the electrode terminals 3 do not occupy the space on both sides of the housing 2 in the third direction. Therefore, by reducing the space occupied by the battery cell 1 in the second and third directions, the space utilization rate of the battery cell 1 and the battery device 100 can be improved, thereby contributing to an increase in the energy density of the battery device 100.

[0127] As shown in Figures 5 to 10, the battery device 100 includes a sampling component 20, which monitors the charge-discharge cycle status of the battery cell 1 and can improve the reliability of the battery device 100. For example, the sampling component 20 can collect voltage and temperature information of the battery cell 1 to detect whether there are any abnormalities in the voltage, temperature, etc. of the battery cell 1.

[0128] The sampling component 20 can collect information by electrically connecting to the electrode terminal 3 provided in the recess 4. Exemplarily, the sampling component 20 can send the collected information to the Battery Management System (BMS). In this embodiment of the present disclosure, the recesses 4 of each battery cell 1 in a battery cell group 10 are all located on the same side along a third direction, thus facilitating the sampling component 20 to sample each battery cell 1 in the battery cell group 10 simultaneously.

[0129] The sampling component 20 is disposed along the second direction on the side of the battery cell group 10 where the recess 4 is formed. Thus, the space saved by the battery cell 1 along the second direction can be fully utilized to arrange the sampling component 20 without reserving additional space for the sampling component 20. This makes the layout of each component in the battery device 100 more reasonable, which is conducive to improving space utilization and thus improving the energy density of the battery device 100.

[0130] For example, along a third direction, the sampling component 20 can be positioned close to the recess 4, which helps to shorten the sampling path and improve sampling efficiency.

[0131] In some embodiments of this disclosure, the recess 4 is located at one end of the housing 2 along a third direction, and the recess 4 of each battery cell 1 of a battery cell group 10 is located on the same side along the direction.

[0132] Since the recess 4 is formed at one end of the housing 2 along the third direction, the space reserved in the entire length direction of the battery cell 1 for setting the electrode terminal 3 is saved, and the saved space can be used to arrange components such as the sampling assembly 20.

[0133] Furthermore, since the recesses 4 of each battery cell 1 in the battery cell pack 10 are all located on the same side, it is easier for external conductive components (such as busbars) to electrically connect each battery cell 1 in the battery cell pack 10.

[0134] In some embodiments of this disclosure, as shown in FIG3, the recess 4 is configured to extend through a first direction. The first housing wall 21 includes a first segment 211, a second segment 212, and a third segment 213 connected in sequence. Along a second direction, the third segment 213 is recessed towards the interior of the housing 2 relative to the first segment 211. The second segment 212 and the third segment 213 form the recess 4. The electrode terminal 3 is disposed on the third segment 213.

[0135] For example, the first segment 211, the second segment 212 and the third segment 213 of the first housing wall 21 can be formed into an integral structural component by processes such as stamping and bending.

[0136] As another example, the first segment 211 and the second segment 212 of the first housing wall 21 can be integrally formed and then assembled together with the third segment 213 as a separate structure; alternatively, the second segment 212 and the third segment 213 can be integrally formed and then assembled together with the first segment 211 as a separate structure; or, the first segment 211, the second segment 212, and the third segment 213 can all be formed as separate structures and then assembled together. The assembly methods for the aforementioned separate structures include, but are not limited to, bolting, welding, riveting, snap-fitting, or bonding.

[0137] As shown in Figure 3, the first segment 211 and the third segment 213 of the first housing wall 21 extend along a third direction, the second segment 212 extends along a second direction, and the second segment 212 connects the first segment 211 and the third segment 213.

[0138] For example, an opening (not shown in the figure) is formed on the third segment 213, through which the electrode terminal 3 passes and is electrically connected to the electrode assembly inside the housing 2. A sealing element may be provided between the opening and the electrode terminal 3, thereby achieving a sealed fit between the electrode terminal 3 and the first housing wall 21.

[0139] In some embodiments, an insulating structure may be provided between the electrode terminal 3 and the third segment 213 to insulate and isolate the electrode terminal 3 from the housing 2, thereby reducing the possibility of short circuits or other adverse conditions occurring in the battery cell 1 due to abnormal contact between the electrode terminal 3 and the housing 2.

[0140] In this embodiment of the present disclosure, the recess 4 is configured to be through along the first direction. Therefore, when multiple battery cells 1 of a battery cell group 10 are arranged and stacked along the first direction, the recess 4 of each battery cell 1 can be connected to each other, thereby facilitating the electrical connection of the electrode terminal 3 of each battery cell 1 with an external conductive structure (e.g., a busbar 5) and realizing the electrical connection of each battery cell 1 in the battery cell group 10.

[0141] In some embodiments of this disclosure, the projection of electrode terminal 3 falls within the projection range of the second segment 212 in a projection plane perpendicular to a third direction.

[0142] In a projection plane perpendicular to the third direction, the projection of electrode terminal 3 falling within the projection range of the second segment 212 can mean that the projection size of electrode terminal 3 along the second direction does not exceed the projection size of the second segment 212 along the second direction.

[0143] Therefore, electrode terminal 3 can share at least part of the space in the second direction with the second segment 212, without needing to occupy additional space in the second direction, thereby reducing the space occupied by electrode terminal 3 on battery cell 1. When viewed along the third direction, electrode terminal 3 does not protrude from the first segment 211 of the first housing wall 21, thus not increasing the size of battery cell 1 in the second direction, and is less likely to interfere with the arrangement of external components (e.g., sampling component 20, etc.), thereby improving the energy density of battery cell 1 and battery device 100.

[0144] In some embodiments of this disclosure, the second segment 212 has a dimension in the second direction ranging from 3 mm to 10 mm.

[0145] The dimension of the second segment 212 along the second direction can also be referred to as the depth dimension of the recess 4.

[0146] For example, the dimensions of the second segment 212 along the second direction can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0147] This ensures that the dimensions of the second segment 212 along the second direction are within a suitable range, enabling the recessed portion 4 to have sufficient size to accommodate the electrode terminal 3 while reducing the space occupied inside the housing 2, thus balancing the reliability and energy density of the battery cell 1.

[0148] In some embodiments of this disclosure, the electrode terminal 3 protrudes from the third segment 213 along the second direction by a size ranging from 0.5 mm to 3 mm.

[0149] The electrode terminal 3 protrudes from the third segment 213 along the second direction. This reduces the risk of short circuit and leakage caused by contact between the component electrically connected to the electrode terminal 3 and the housing 2.

[0150] For example, the size of the electrode terminal 3 protruding from the third segment 213 along the second direction can be 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, etc.

[0151] This ensures that the size of the electrode terminal 3 protruding from the third segment 213 along the second direction is within a suitable range, so that the electrode terminal 3 does not exceed the recessed portion 4 along the second direction without affecting the electrical connection of the external conductive structure to the electrode terminal 3, thereby reducing the size of the battery cell 1 in the second direction and improving the energy density of the battery cell 1.

[0152] In some embodiments of this disclosure, the third segment 213 has a dimension in the third direction ranging from 80 mm to 400 mm.

[0153] The dimension of the third segment 213 along the third direction can also be referred to as the length dimension of the recess 4. It can be understood that the dimension of the third segment 213 along the third direction is equal to the difference between the dimension of the battery cell 1 along the third direction and the dimension of the first segment 211 along the third direction.

[0154] Because the dimensions of the third segment 213 along the third direction are within a suitable range, the recess 4 has sufficient space to accommodate the two electrode terminals 3, and the two electrode terminals 3 are less likely to short-circuit with each other. In addition, it can reduce the space occupied inside the casing 2, thus balancing the reliability and energy density of the battery cell 1.

[0155] For example, the dimensions of the third segment 213 along the third direction can be 80mm, 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, 220mm, 240mm, 260mm, 280mm, 300mm, 320mm, 340mm, 360mm, 400mm, etc.

[0156] In some embodiments of this disclosure, as shown in Figures 4 to 8, the battery device 100 further includes a busbar 5, through which two adjacent battery cells 1 in the battery cell group 10 along a first direction are connected in series. The sampling assembly 20 includes a sampling element 6 and a sampling terminal 7, with the sampling terminal 7 connecting the sampling element 6 and the busbar 5.

[0157] The busbar 5, also known as an electrical connector or a battery pack, is a structural component that enables electrical connection of the battery cell 1.

[0158] The busbar 5 is generally plate-shaped or sheet-shaped. For example, the busbar 5 can be made of a metallic material, including but not limited to copper and aluminum. The metallic material allows the busbar 5 to have suitable structural strength while also providing a certain degree of flexibility, thus better adapting to changes in the installation position of the busbar 5 caused by the expansion of the battery cell 1 during charging and discharging.

[0159] Of course, those skilled in the art will understand that the busbar 5 can also be made of any other suitable material.

[0160] The present invention does not specifically limit the size and shape of the busbar 5, but can set it according to the size of the electrode terminal 3 and the distance between the electrode terminals 3 of adjacent battery cells 1.

[0161] In this embodiment of the disclosure, as shown in FIG3, the electrode terminal 3 includes a first electrode terminal 31 and a second electrode terminal 32 with opposite polarities.

[0162] For example, the first electrode terminal 31 is a positive electrode terminal and the second electrode terminal 32 is a negative electrode terminal.

[0163] As another example, the first electrode terminal 31 is a negative electrode terminal, and the second electrode terminal is a positive electrode terminal.

[0164] Along the direction indicated by the first direction arrow, the busbar 5 connects the first electrode terminal 31 of the previous battery cell 1 and the second electrode terminal 32 of the next battery cell 1, or the busbar 5 connects the second electrode terminal 32 of the previous battery cell 1 and the first electrode terminal 31 of the next battery cell 1, thereby realizing the series connection of adjacent battery cells 1 in a battery cell group 10.

[0165] In this embodiment of the present disclosure, along the first direction, the first electrode terminals 31 and the second electrode terminals 32 of each battery cell 1 in a battery cell group 10 are arranged in the same order. Therefore, the busbar 5 is generally arranged at an angle.

[0166] In some other embodiments, along the first direction, the first electrode terminals 31 and the second electrode terminals 32 of adjacent battery cells 1 in a battery cell group 10 are arranged in opposite order.

[0167] Those skilled in the art should understand that in the embodiments of this disclosure, the battery cells 1 in the battery cell group 10 are connected in series with each other. In some other embodiments, the battery cells 1 can also be connected in parallel or in a mixed manner by changing the connection method of the busbar 5. The embodiments of this disclosure do not specifically limit this.

[0168] The sampling assembly 20 includes a sampling element 6 and a sampling terminal 7, with the sampling terminal 7 connecting the sampling element 6 and the busbar 5. The connection between the sampling element 6 and the busbar 5 improves the accuracy of the sampling assembly 20 in acquiring information about the battery cell 1.

[0169] For example, the sampling terminal 7 can be fixedly connected to the bus 5 by welding, and the welding method includes but is not limited to reflow soldering, ultrasonic welding, laser welding, etc.

[0170] The sampling terminal 7 and the busbar 5 can be made of the same material, which makes it easier to weld the sampling terminal 7 and the busbar 5, thereby improving the connection stability and the current carrying capacity between the two, and making the sampling device 6 collect parameters such as the voltage of the battery cell 1 more stable and reliable.

[0171] The sampling terminal 7 and the busbar 5 can also be made of different materials. For example, the sampling terminal 7 can be made of nickel. Nickel has high conductivity, which allows current to flow more smoothly, thereby reducing sampling errors. In addition, nickel has strong shape adaptability and can be bent and folded according to the shape of different battery cells 1 and different arrangement positions of sampling components 6, making it easier to install sampling components 6.

[0172] This disclosure does not specifically limit the type or shape of the sampling element 6 and the sampling terminal 7, but can be set according to the actual situation.

[0173] For example, there are multiple sampling terminals 7, and the multiple sampling terminals 7 are connected to multiple busbars 5 respectively, so that the status information of multiple battery cells 1 can be obtained simultaneously.

[0174] In some embodiments of this disclosure, the sampling component 20 includes a sampling plate or a sampling harness.

[0175] Therefore, the battery cell group 10 can be sampled by sampling plate or sampling harness, and different sampling components 6 can be selected according to different situations, which helps to improve the layout flexibility within the battery device 100.

[0176] As shown in Figures 5 to 8, the sampling component 6 of the sampling assembly 20 is a sampling board, which includes, but is not limited to, a flexible printed circuit board (FPC) and a flexible flat cable connect flexible die-cut circuit (FCC).

[0177] Flexible printed circuit boards (FPCs) are printed circuit boards made with polyimide or polyester film as the substrate. Flexible circuit boards are lightweight, effectively reducing the size and weight of the battery device 100, achieving weight reduction. They also offer good flexibility, high reliability, and a long service life.

[0178] FCC is a signal acquisition component that uses a flexible flat cable (FFC) to graft an FPC or FDC (flexible die-cutting circuit). The main body of FCC is FFC, which is welded to bus 5 through FPC or FDC to achieve the sampling requirements. FCC can achieve nickel-free sampling, which helps to reduce costs.

[0179] As shown in Figures 9 and 10, the sampling component 20 is a sampling harness. When sampling the battery cell 1 through the sampling harness, the assembly of the battery cell 1 and the wiring of the sampling harness can be performed simultaneously, thereby shortening the overall assembly time of the battery device 100 and improving the assembly efficiency of the battery device 100. Moreover, the sampling harness can be adjusted according to different battery device 100 conditions, providing greater flexibility and being suitable for the design of various battery device 100s.

[0180] In addition, using a sampling harness to sample the battery cell 1 can eliminate the need for the sampling terminal 7, allowing direct connection to the busbar 5 via the harness. This reduces the number of components in the battery device 100, lowers assembly difficulty, and saves production costs.

[0181] In some embodiments of this disclosure, as shown in Figures 5 and 10, the sampling member 6 extends along a first direction, and in a projection plane perpendicular to the second direction, the projection of the sampling member 6 at least partially falls within the projection range of the recess 4.

[0182] The sampling element 6 is a strip structure extending along the first direction. The direction of extension is the same as the stacking direction of the battery cells 1 in the battery cell group 10. This makes it easier for the sampling element 6 to collect information of each battery cell 1 in the battery cell group 10, which is beneficial to improving the sampling range of the sampling component 20 and improving the reliability of the sampling component 20 during sampling.

[0183] In this embodiment of the present disclosure, one sampling element 6 simultaneously samples all battery cells 1 of a battery cell group 10. In some other embodiments, a sampling component 20 may include multiple sampling elements 6, which sample each battery cell 1 in a battery cell group 10 separately.

[0184] In the projection plane perpendicular to the second direction, the projection of the sampling element 6 falls at least partially within the projection range of the recess 4. That is, when viewed along the second direction, at least part of the sampling element 6 covers the area of ​​the recess 4. This allows the sampling element 6 to be positioned close to the electrode terminal 3 located in the recess 4, thereby facilitating a shorter sampling path.

[0185] The projection of the sampling element 6 can fall at least partially within the projection range of the recessed portion 4, or the entire projection of the sampling element 6 can fall within the projection range of the recessed portion 4, that is, the sampling element 6 is entirely disposed in the recessed portion 4, or a portion of the projection of the sampling element 6 can fall within the projection range of the recessed portion 4, that is, a portion of the sampling element 6 is disposed in the first section 211 of the first housing wall 21, and the other portion is located above the recessed portion 4.

[0186] In some embodiments of this disclosure, as shown in Figures 5, 6 and 10, the projection of the sampling element 6 falls completely within the projection range of the recess 4 in a projection plane perpendicular to the second direction, and the projection of the sampling element 6 falls within the projection range of the second segment 212 in a projection plane perpendicular to the third direction.

[0187] Therefore, the sampling component 6 can be accommodated in the recessed portion 4, which minimizes the sampling path and improves the response speed. This allows the battery management system to capture the state of the battery cell 1 more quickly and timely, thereby facilitating timely adjustment of the working state of the battery cell 1, more accurate control of the charge and discharge cycle process of the battery cell 1, and reducing the possibility of damage to the battery cell 1.

[0188] In addition, the sampling component 6 can make full use of the space of the recessed portion 4, making the overall structure of the battery cell group 1 with the sampling assembly 20 more compact, reducing the space occupied by the battery cell group 10 with the sampling component 20 in the second direction, which in turn helps to further increase the space utilization rate within the battery device 100 and improve the energy density of the battery device 100.

[0189] In this embodiment, the highest point of the sampling member 6 can be flush with the first segment 211 of the first housing wall 21, or, along the second direction, the highest point of the sampling member 6 can be lower than the first segment 211, that is, along the second direction, the highest point of the sampling member 6 does not exceed the second segment 212. Thus, the sampling member 6 can fully utilize the space of the recess 4, saving the height of the battery device 100 along the second direction.

[0190] Of course, those skilled in the art should understand that in some other embodiments, the highest point of the sampling element 6 may also be higher than the first segment 211.

[0191] In some embodiments of this disclosure, as shown in FIG7, the sampling terminal 7 includes a first part 71, a second part 72, and a third part 73 connected in sequence. The extending direction of the second part 72 intersects the extending directions of the first part 71 and the third part 73, and the extending directions of the first part 71 and the second part 72 are the same. The first part 71 is connected to the sampling member 6, and the third part 73 is connected to the busbar 5.

[0192] In this embodiment, the first part 71, the second part 72, and the third part 73 are formed as an integral structural component, which is generally bent into a "C" shape. Thus, by bending the sampling terminal 7, the sampling component 6 can be connected to the busbar 5 through the sampling terminal 7, thereby improving the accuracy of the sampling component 6 in obtaining information about the battery cell 1.

[0193] Furthermore, the bent sampling terminal 7 allows for a more compact overall structure of the sampling component 20, thereby reducing the space occupied by the sampling component 20 and improving the space utilization within the battery device 100, which in turn helps to increase the energy density of the battery device 100. Moreover, it also helps to shorten the sampling path, thus improving sampling efficiency.

[0194] The embodiments disclosed herein do not impose specific limitations on the bending method of the sampling terminal 7, but can be specifically set according to the actual arrangement position of the sampling component 6 and the busbar 5.

[0195] Of course, those skilled in the art should understand that in some other embodiments, the first part 71, the second part 72, and the third part 73 may also be separate structures that are then assembled together.

[0196] In some embodiments of this disclosure, the battery device 100 further includes a heat insulation element (not shown) located between the sampling element 6 and the busbar 5.

[0197] During the charging and discharging process, the battery cell 1 generates a certain amount of heat, which is conducted to the busbar 5 and then to the sampling component 20. If the heat is too high, the sampling component 20 may be damaged.

[0198] Since a heat insulation component is provided between the sampling component 6 and the manifold 5, the heat insulation component can play a certain protective role, reducing the possibility of the sampling component 6 being damaged due to excessive heat, and improving the sampling reliability of the sampling assembly 20.

[0199] For example, the heat insulation element can be disposed between the first part 71 and the third part 73 of the sampling terminal 7, so as to achieve good heat insulation without affecting the connection of the sampling element 6 to the busbar 5 through the sampling terminal 7.

[0200] In some embodiments of this disclosure, as shown in Figures 8 and 9, the sampling element 6 extends along a first direction and is disposed on the first segment 211 of the first housing wall 21.

[0201] Therefore, the sampling element 6 is a strip structure extending along the first direction, and the extension direction is the same as the stacking direction of the battery cells 1 in the battery cell group 10. This makes it easier for the sampling element 6 to collect information of each battery cell 1 in the battery cell group 10, which is beneficial to improving the sampling range of the sampling component 20 and improving the reliability of the sampling component 20 during sampling.

[0202] Moreover, the sampling element 6 is located on the relatively flat first section 211, which makes it easier to install the sampling element 6 and helps to improve the reliability of the sampling element 6 during sampling.

[0203] In addition, the sampling component 6 is less susceptible to the heat generated by the busbar 5, thereby reducing the possibility of damage to the sampling component 6 due to excessive heat and improving the reliability of the sampling assembly 20.

[0204] In some embodiments of this disclosure, as shown in FIG8, the sampling terminal 7 includes a first part 71, a second part 72, and a third part 73 connected in sequence. The extending direction of the second part 72 intersects the extending directions of the first part 71 and the third part 73, and the extending directions of the first part 71 are opposite to those of the second part 72. The first part 71 is connected to the sampling member 6, and the third part 73 is connected to the busbar 5.

[0205] In this embodiment, the first part 71, the second part 72 and the third part 73 are formed as an integral structural component, which is generally bent into a "Z" shape. Thus, by bending the sampling terminal 7, the sampling component 6 can be connected to the busbar 5 through the sampling terminal 7, thereby improving the accuracy of the sampling component 6 in obtaining information about the battery cell 1.

[0206] Furthermore, the bent sampling terminal 7 allows for a more compact overall structure of the sampling component 20, thereby reducing the space occupied by the sampling component 20 and improving the space utilization within the battery device 100, which in turn helps to increase the energy density of the battery device 100. Moreover, it also helps to shorten the sampling path, thus improving sampling efficiency.

[0207] The embodiments disclosed herein do not impose specific limitations on the bending method of the sampling terminal 7, but can be specifically set according to the actual arrangement position of the sampling component 6 and the busbar 5.

[0208] Of course, those skilled in the art should understand that in some other embodiments, the first part 71, the second part 72, and the third part 73 may also be separate structures that are then assembled together.

[0209] In some embodiments of this disclosure, as shown in FIG7, the electrode terminal 3 includes a first electrode terminal 31 and a second electrode terminal 32 with opposite polarities. The busbar 5 includes a first segment 51, a second segment 52, and a third segment 53 connected in sequence. Along the second direction, the second segment 52 is recessed relative to the first segment 51 and the third segment 53 toward the housing 2. The first segment 51 is connected to the first electrode terminal 31 of a battery cell 1, and the third segment 53 is connected to the second electrode terminal 32 of another battery cell 1 adjacent to the battery cell 1 along the first direction. The sampling terminal 7 is connected to the sampling element 6 and the second segment 52.

[0210] In this embodiment of the present disclosure, the first electrode terminal 31 and the second electrode terminal 32 of opposite polarities of a battery cell 1 are both disposed in the same recess 4, which can shorten the distance between the positive and negative electrodes of the battery cell 1 and shorten the current flow path, thereby helping to reduce the impedance of the battery cell 1 during the charge and discharge cycle, improve the performance and output power of the battery cell 1, and also help to reduce the temperature rise of the battery cell 1 during the charge and discharge cycle, thereby improving the reliability of the battery cell 1.

[0211] Furthermore, since the electrode terminals 3 of a single battery cell 1 are concentrated in the same recess 4, it is easier for the busbar 5 to electrically connect multiple battery cells 1 when multiple battery cells 1 are grouped together.

[0212] In some other embodiments, each of the pair of first housing walls 21 of the battery cell 1 can be recessed inward toward the interior of the housing 2 along the second direction to form two recesses 4, and the first electrode terminal 31 and the second electrode terminal 32 are respectively disposed in the two recesses 4.

[0213] Because the second section 52 of the busbar 5 is recessed relative to the first section 51 and the third section 53 towards the housing 2, the recessed second section 52 of the busbar 5 can reserve sufficient installation space for the sampling terminal 7, thereby enabling the sampling component 6 to better sample the battery cells through the sampling terminal 7. Furthermore, reducing the installation height of the sampling assembly 20, i.e., preventing the sampling assembly 20 from occupying excessive space in the second direction, helps to reduce the volume of the battery device 100, achieving miniaturization and integration of the battery device 100. While keeping the volume of the housing 30 of the battery device 100 unchanged, it is beneficial to increase the volume of the battery cell 1, thereby improving the energy density of the battery cell 1 and the battery device 100.

[0214] In addition, the recessed design can reduce the expansion and deformation of the busbar 5 during the charge and discharge cycle of the battery cell 1, thereby reducing the height of the busbar 5 along the second direction, which is beneficial to improving the energy density of the battery device 100.

[0215] In some embodiments of this disclosure, as shown in FIG8, the sampling component 20 further includes a connector 8, which is disposed at one end of the sampling component 20 along a first direction, and is used to output the information collected by the sampling component 20.

[0216] Connector 8 is electrically connected to sampling element 6 of sampling component 20. Thus, sampling component 20 can receive and transmit information such as voltage, current or temperature of each battery cell 1 collected by sampling element 6 through connector 8, and transmit the information collected by sampling element 6 to battery management system of battery device 100 in the form of electrical signals, thereby monitoring the charging and discharging process and status of battery cell 1 in real time.

[0217] In some embodiments, connector 8 can also be electrically connected to an external circuit to transmit the information collected by sampler 6 to the external circuit.

[0218] In some embodiments of this disclosure, the battery device 100 further includes a housing 30, within which the battery cell pack 10 is housed. The housing 30 has a clearance groove extending along a first direction, configured to accommodate the sampling component 20.

[0219] As shown in Figure 2, in this embodiment of the present disclosure, the battery device 100 includes a housing 30, which is an external protective structure of the battery device 100. An internal accommodating space 301 is formed to accommodate various functional devices that enable the battery device 100 to perform its functions. Exemplarily, the battery cell group 10, sampling component 20, high-voltage distribution box, battery management system, etc., are accommodated within the accommodating space 301.

[0220] As an example, the housing 30 may include a first housing 30a and a second housing 30b. The first housing 30a and the second housing 30b are fastened together to form a closed space inside the housing 30 to house the battery cell pack 10. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 30a may be a top cover or a bottom plate.

[0221] In some embodiments, the housing 30 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 30 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 30 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0222] Although not shown in the figure, the second housing 30b of the housing 30 may have a clearance groove extending through the housing wall of the housing 30 in the first direction. Thus, when the battery cell pack 10 is housed in the housing 30, at least a portion of the sampling component 20 can be housed in the clearance groove of the housing 30, thereby providing a certain degree of protection and limiting effect for the sampling component 20.

[0223] In addition, the sampling component 20 can be placed in a suitable position in the housing through the clearance groove, which helps to reduce the space occupied by the extension of the sampling component 20, thereby making the structure of the battery device 100 more compact and improving the space utilization of the housing 30.

[0224] The embodiments disclosed herein do not specifically limit the shape and size of the clearance groove, but can be specifically set according to factors such as the shape and size of the sampling component 20.

[0225] In some embodiments of this disclosure, the size of the battery cell 1 along the first direction is in the range of 10 mm to 35 mm, and / or the size of the battery cell 1 along the second direction is in the range of 80 mm to 130 mm, and / or the size of the battery cell 1 along the third direction is in the range of 300 mm to 1300 mm.

[0226] Therefore, the battery cell 1 is a blade battery, which has advantages such as high efficiency, high safety, and low cost. Moreover, the design of the blade battery can make fuller use of the space inside the housing 30 of the battery device 100, so that the housing 30 of the battery device 100 can store more energy in the same volume, which is beneficial to improving the energy density of the battery device 100.

[0227] The battery cell 1 of this embodiment has a recessed portion 4, which is a special blade battery structure. While taking into account the advantages of traditional blade batteries, it also helps to reduce the space occupied by the electrode terminals 3 in the second direction, thereby improving the space utilization of the battery cell 1 and thus improving the energy density of the battery cell 1.

[0228] For example, the dimension of the battery cell 1 along the first direction can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, etc. The dimension of the battery cell 1 along the first direction can also be referred to as the thickness of the battery cell 1, that is, the thickness of the battery cell 1 can be the maximum dimension of the battery cell 1 along the first direction.

[0229] For example, the dimension of the battery cell 1 along the second direction can be 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 120mm, 130mm, etc. The dimension of the battery cell 1 along the second direction can also be called the height of the battery cell 1, that is, the height of the battery cell 1 can be the maximum dimension of the battery cell 1 along the second direction.

[0230] For example, the dimensions of the battery cell 1 along a third direction can be 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm, 1200mm, 1300mm, etc. The dimension of the battery cell 1 along a third direction can also be called the length of the battery cell 1, that is, the length of the battery cell 1 can be the maximum dimension of the battery cell 1 along a third direction.

[0231] By designing the size of the battery cell 1 to satisfy the above relationship, it is beneficial to balance the energy density and stacking efficiency of the battery cell 1.

[0232] In some embodiments of this disclosure, as shown in FIG11, there are multiple battery cell groups 10, which are arranged along a third direction. Along the third direction, the recesses 4 of two adjacent battery cell groups 10 are arranged opposite to each other or away from each other.

[0233] This allows multiple battery cell groups 10 to be arranged along a third direction, which helps to further increase the energy density of the battery device 100.

[0234] When there are multiple battery cell groups 10, there are also multiple sampling components 20. One sampling component 20 samples each battery cell 1 in a battery cell group 10 at the same time.

[0235] Of course, those skilled in the art should understand that in some other embodiments, a battery cell group 10 may also be provided with multiple sampling components 20, and each battery cell 1 of the battery cell group 10 may be sampled by the multiple sampling components 20.

[0236] A second aspect of this disclosure provides an electrical device that includes a battery device 100 of the first aspect of this disclosure for providing electrical energy.

[0237] Electrical devices include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0238] Since the electrical device includes the battery device 100 provided in the first aspect of the present disclosure, it is advantageous to improve the energy density and space utilization of the electrical device.

[0239] A third aspect of this disclosure provides an energy storage device, which includes a battery device 100 of the first aspect of this disclosure for storing or providing electrical energy.

[0240] Since the energy storage device includes the battery device 100 provided in the first aspect of the present disclosure, it is advantageous to improve the energy density and space utilization of the energy storage device.

[0241] The following describes specific examples of some embodiments of this disclosure with reference to the accompanying drawings.

[0242] As a specific example, a special blade cell (cell 1) is provided, which can be 300mm to 1300mm in length, 10mm to 35mm in thickness, and 80mm to 130mm in height. One wall of the casing of the blade cell is recessed along a second direction (the height direction of the cell) to form a recess 4, and the electrode terminal 3 and the busbar 5 are located in the recess 4.

[0243] Multiple blade cells can be assembled into a blade cell group (cell assembly 10). The recess 4 of each blade cell in the blade cell group is formed on one side of the casing along a third direction (the length direction of the cell), and the recess 4 of each blade cell is located on the same side along the third direction. A busbar 5 connects the electrode terminals 3 of each blade cell so that the blade cells are connected in series with each other.

[0244] A sampling component 20 is also provided on the side of the blade cell assembly where the recess 4 is formed along the third direction. The sampling component 20 is connected to the busbar 5 provided in the recess 4, thereby sampling each blade cell.

[0245] The sampling component 20 can be completely located in the recessed portion 4, partially located in the recessed portion 4, or located in a section of the shell wall where the recessed portion 4 is not formed.

[0246] The sampling assembly 20 includes a sampling element 6 and a sampling terminal 7, with the sampling terminal 7 connecting the sampling element 6 and the busbar 5. The sampling element 6 can be a sampling plate or a sampling harness. The sampling terminal 7 can be bent into different shapes depending on the different arrangements of the sampling plate.

[0247] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0248] The above embodiments are merely illustrative of the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure, and all should be covered within the scope of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery device, comprising: A battery cell assembly includes at least two battery cells arranged along a first direction. Each battery cell includes a housing and electrode terminals. The housing includes a pair of first housing walls disposed opposite each other along a second direction. A portion of one of the first housing walls has a recess along the second direction, and the electrode terminals are disposed in the recess. A sampling component, along the second direction, is disposed on the side of the battery cell assembly where the recess is formed, and the sampling component is electrically connected to the electrode terminals of each battery cell. The recessed portion is located at one or both ends of the housing along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is the length direction of the battery cell.

2. The battery device according to claim 1, wherein, The recess is located at one end of the housing along the third direction, and the recesses of each battery cell in a battery cell group are all located on the same side along the third direction.

3. The battery device according to claim 2, wherein, The recessed portion is configured to extend through the first direction. The first shell wall includes a first segment, a second segment, and a third segment connected in sequence. Along the second direction, the third segment is recessed towards the interior of the shell relative to the first segment. The second segment and the third segment form the recessed portion. The electrode terminals are located in the third segment.

4. The battery device according to claim 3, wherein, In a projection plane perpendicular to the third direction, the projection of the electrode terminal falls within the projection range of the second segment.

5. The battery device according to claim 3 or 4, wherein, The battery device further includes a busbar, and two adjacent battery cells in the battery cell group along the first direction are connected in series through the busbar. The sampling component includes a sampling element and a sampling terminal, wherein the sampling terminal connects the sampling element and the busbar.

6. The battery device according to claim 5, wherein, The sampling element extends along the first direction, and in a projection plane perpendicular to the second direction, the projection of the sampling element at least partially falls within the projection range of the recess.

7. The battery device according to claim 6, wherein, In the projection plane perpendicular to the second direction, the projection of the sampling element falls completely within the projection range of the recess, and in the projection plane perpendicular to the third direction, the projection of the sampling element falls within the projection range of the second segment.

8. The battery device according to claim 6 or 7, wherein, The sampling terminal includes a first part, a second part, and a third part connected in sequence. The extension direction of the second part intersects the extension directions of the first part and the third part, and the extension directions of the first part and the second part are the same. The first part is connected to the sampling device, and the third part is connected to the busbar.

9. The battery device according to any one of claims 6 to 8, wherein, The battery device also includes a heat insulation component located between the sampling component and the busbar.

10. The battery device according to claim 5, wherein, The sampling element extends along the first direction and is disposed in the first segment of the first housing wall.

11. The battery device according to claim 10, wherein, The sampling terminal includes a first part, a second part, and a third part connected in sequence. The extending direction of the second part intersects with the extending directions of the first part and the third part, and the extending directions of the first part and the second part are opposite. The first part is connected to the sampling device, and the third part is connected to the busbar.

12. The battery device according to any one of claims 5 to 11, wherein, The electrode terminals include a first electrode terminal and a second electrode terminal with opposite polarities; The manifold includes a first section, a second section, and a third section connected in sequence. Along the second direction, the second section is recessed relative to the first section and the third section in the direction toward the housing. The first segment is connected to the first electrode terminal of one of the battery cells, the third segment is connected to the second electrode terminal of another battery cell adjacent to the battery cell along the first direction, and the sampling terminal is connected to the sampling element and the second segment.

13. The battery device according to any one of claims 1 to 12, wherein, The sampling component includes a sampling plate or a sampling harness.

14. The battery device according to any one of claims 1 to 13, wherein, The sampling component further includes a connector located at one end of the sampling component along the first direction, and the connector is used to output the information collected by the sampling component.

15. The battery device according to any one of claims 1 to 14, wherein, The battery device also includes a housing, in which the battery cell pack is housed; The housing has a clearance groove that extends along the first direction and is configured to accommodate the sampling component.

16. The battery device according to any one of claims 3 to 15, wherein, The second segment has a dimension in the second direction that is between 3 mm and 10 mm.

17. The battery device according to any one of claims 3 to 16, wherein, The electrode terminal protrudes from the third segment along the second direction by a size ranging from 0.5 mm to 3 mm.

18. The battery device according to any one of claims 3 to 17, wherein, The dimension of the third segment along the third direction is in the range of 80mm to 400mm.

19. The battery device according to any one of claims 3 to 18, wherein, The dimensions of the battery cell along the first direction are in the range of 10 mm to 35 mm; and / or The dimensions of the battery cell along the second direction are in the range of 80 mm to 130 mm; and / or The dimensions of the battery cell along the third direction are in the range of 300mm to 1300mm.

20. The battery device according to any one of claims 1 to 19, wherein, The number of battery cell groups is multiple, and the multiple battery cell groups are arranged along the third direction; Along the third direction, the recesses of two adjacent battery cell groups are arranged opposite to each other or back to each other.

21. An electrical device comprising a battery device according to any one of claims 1 to 20 for providing electrical energy.

22. An energy storage device comprising a battery device according to any one of claims 1 to 20 for storing or providing electrical energy.

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