Battery device and electric device

Abstract

The utility model relates to the technical field of batteries, discloses a battery device and a power utilization device, and can improve the energy density of the battery device to a certain extent. The battery device comprises a battery cell group and a sampling assembly, and the battery cell group comprises a plurality of battery cells which are sequentially connected in series; the sampling assembly comprises a plurality of sampling parts, connecting wire harnesses and an output port, each sampling part is electrically connected with at least one connecting wire harness, the plurality of connecting wire harnesses are connected with the output port, and the plurality of sampling parts comprise a first sampling part and a second sampling part; each of the first sampling parts and the second sampling parts is provided with a sampling point which can be electrically connected with a series path of the battery cells, and the two first sampling parts are electrically connected with the battery cell at the head end and the battery cell at the tail end of the plurality of battery cells which are sequentially connected in series; and on a series connection path of the plurality of battery cells, the number of the battery cells between at least two adjacent sampling points of the second sampling part is greater than or equal to two.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In related technologies, a battery device typically includes multiple cells arranged in a housing. To collect cell parameters such as voltage and current for reference by the battery management system, the ends of each cell are electrically connected to a battery monitoring unit (BMU). However, when the number of cells is large, the electrical connection paths between the cells and the BMU can become redundant and complex, hindering further improvements in the battery device's energy density. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device and an electrical device, which can at least improve the energy density of the battery device.

[0004] In a first aspect, the present application provides a battery device. The battery device includes a battery cell group and a sampling assembly, wherein:

[0005] The battery cell group includes a plurality of battery cells arranged in series;

[0006] The sampling component includes multiple sampling parts, connecting harnesses and output ports. Each sampling part is electrically connected to at least one connecting harness, and multiple connecting harnesses are connected to the output port. The multiple sampling parts include a first sampling part and a second sampling part. The first sampling part and the second sampling part both have sampling points that can be electrically connected to the series path of the battery cells. There are two first sampling parts, which are respectively electrically connected to the battery cells at the head end and the battery cells at the tail end of the multiple battery cells connected in series in sequence; and on the series path of the multiple battery cells, the number of battery cells between the sampling points of at least two adjacent second sampling parts is greater than or equal to two.

[0007] In the above technical solution, the sampling points of two adjacent second sampling parts on the series path of multiple battery cells can collect the parameters of the battery cells between the two sampling points. There are at least two adjacent second sampling parts in the battery device that can collect the parameters of two or more battery cells, so that the number of sampling parts can be reduced accordingly, so that the wiring harness connected to the sampling parts can also be shortened and streamlined, thereby saving installation space, improving the energy density of the battery device, and reducing costs to a certain extent.

[0008] According to some embodiments of the present application, optionally, on a series path of multiple battery cells, the number of battery cells between every two adjacent sampling points of the second sampling parts is equal and greater than or equal to two.

[0009] In the above technical solution, on the series path of multiple battery cells, the number of battery cells between the sampling points of every two adjacent second sampling parts is equal and greater than or equal to two. Compared with separately setting up sampling parts at both ends of each battery cell, the number of sampling parts is reduced, and the sampling parts can be connected to the battery monitoring unit with a shorter wiring harness, thereby saving installation space and reducing costs to a certain extent.

[0010] According to some embodiments of the present application, optionally, on a series path of multiple battery cells, there are one or more battery cells between a sampling point of a first sampling portion and a sampling point of an adjacent second sampling portion.

[0011] In the above technical solution, on the series path of multiple battery cells, the number of battery cells between adjacent sampling points of the second sampling parts can be one or more, thereby saving space while improving the sampling accuracy, and the distribution positions of the sampling points can flexibly adapt to various arrangements of the battery cells.

[0012] According to some embodiments of the present application, optionally, multiple battery cells are arranged into a battery row along a first direction, the battery cell group includes at least one battery row, the sampling points of the two first sampling parts are respectively located on both sides of the battery cell group along a second direction, and the sampling points of the second sampling part are distributed on the same side or different sides of the battery row in the second direction, and the second direction forms an angle with the first direction.

[0013] In the above technical solution, the sampling points of the two first sampling parts are respectively located on both sides of the battery cell group along the second direction. On the series path of multiple battery cells, the number of battery cells between the sampling points of adjacent second sampling parts can be one or more, thereby saving space while ensuring that the parameters of all battery cells are collected and improving the sampling accuracy to a certain extent.

[0014] According to some embodiments of the present application, optionally, there are multiple battery rows, and the multiple battery rows are arranged along the second direction and / or the third direction. The sampling points of the second sampling part are distributed on at least one side of one of the battery rows along its own arrangement direction, and angles are formed between the first direction, the second direction, and the third direction.

[0015] In the above technical solution, the sampling points of the second sampling part are distributed on at least one side of one of the battery rows along its own arrangement direction, thereby saving the installation space of the sampling component, and the distribution position of the sampling points can flexibly adapt to various arrangements of battery cells.

[0016] According to some embodiments of the present application, optionally, the number of battery rows is two and the two battery rows are arranged along the second direction, and the sampling points of the second sampling portion are distributed between the two battery rows.

[0017] In the above technical solution, the sampling points of the second sampling part are distributed between two adjacent battery rows, thereby concentrating the positions of the second sampling parts, which is beneficial to saving the installation space of the sampling component and facilitating wiring and assembly.

[0018] According to some embodiments of the present application, optionally, there are two battery rows, the two battery rows are arranged along the second direction, and the sampling points of the second sampling part are distributed on both sides of one of the battery rows along the second direction.

[0019] In the above technical solution, the sampling points of the second sampling unit are distributed on both sides of one of the battery rows along the second direction, so each battery cell in the battery row can be sampled separately, thereby locally improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy according to the sampling parameters.

[0020] According to some embodiments of the present application, optionally, the battery device includes a battery monitoring unit, each battery cell is electrically connected to the battery monitoring unit via a connecting harness, the connecting harness includes a first end and a second end opposite to each other, the first end forms a sampling part, and the second end is electrically connected to the battery monitoring unit.

[0021] In the above technical solution, at least one conductive part of each battery cell is electrically connected to the battery monitoring unit through a connecting harness, and the second end of the connecting harness forms a sampling part and is connected to the conductive part, so that the battery monitoring unit can obtain the parameters of each battery cell through the sampling part and the connecting harness, thereby improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy.

[0022] According to some embodiments of the present application, optionally, the second end is connected to the battery monitoring unit by welding.

[0023] In the above technical solution, the second end is connected to the battery monitoring unit by welding, which helps to reduce the number of adapters and wiring harnesses and save installation space.

[0024] According to some embodiments of the present application, optionally, the second end is connected to the output port, the battery monitoring unit is provided with a connector, and the output port is plugged into the connector.

[0025] In the above technical solution, the second end is plug-connected to the battery monitoring unit via the output port and the connector, thereby improving the connection reliability between the wiring harness and the battery monitoring unit.

[0026] According to some embodiments of the present application, optionally, the battery device includes an electrical connector, a first adapter wire and a second adapter wire, the first adapter wire and the second adapter wire are both connected to the electrical connector, the second ends of the multiple connecting wire harnesses are connected to the electrical connector through the corresponding first adapter wires, and the end of the second adapter wire away from the electrical connector is connected to the output port and plugged into the battery monitoring unit.

[0027] In the above technical solution, the second ends of multiple connecting wires are connected to the electrical connector through the corresponding first adapter wires, and the end of the second adapter wire away from the electrical connector is connected to the battery monitoring unit, so that multiple connecting wires are aggregated and then connected to the battery monitoring unit, thereby simplifying the electrical connection lines between the connecting wires and the battery monitoring unit, saving installation space and facilitating identification, assembly and maintenance.

[0028] According to some embodiments of the present application, optionally, an end of the second adapter wire away from the electrical connector is connected to an output port, the battery monitoring unit is provided with a connector, and the output port is plugged into the connector.

[0029] In the above technical solution, the end of the second adapter wire away from the electrical connector is connected to an output port, the battery monitoring unit is provided with a connector, and the output port is plugged into the connector, so that the circuit connection or disconnection between the battery monitoring unit and the second adapter wire can be achieved by plugging and unplugging the output port or the connector, which is convenient to operate.

[0030] According to some embodiments of the present application, optionally, multiple battery cells are arranged into battery rows along a first direction, the number of battery rows is at least two groups, at least two groups of battery rows are arranged along a second direction, and the battery monitoring unit is arranged on one side of all battery rows or in the middle of two adjacent battery rows along the second direction, and the first direction and the second direction are arranged at an angle.

[0031] In the above technical solution, multiple battery cells are arranged into battery rows along the first direction, and the number of battery rows is at least two groups, which can increase the overall output voltage of the battery device. Along the second direction, the battery monitoring unit is arranged between the two groups of battery cells or on one side of all the battery cell groups, thereby making the structure more compact and saving space in the second direction.

[0032] According to some embodiments of the present application, optionally, the battery cell includes a shell and a conductive part, the conductive part is arranged at the end of the shell along the second direction, the conductive parts of two adjacent battery cells along the second direction are connected, and the first end is connected to a part of the conductive part to form a sampling part.

[0033] In the above technical solution, the conductive parts of two adjacent battery cells arranged along the second direction are connected, which can eliminate or reduce the electrical connection devices between the battery cells and reduce the number of components of the battery cell group, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the battery cell group. The conductive part is connected to the first end of the connecting harness to form a sampling part, which simplifies the structure of the sampling part.

[0034] According to some embodiments of the present application, optionally, the first end portion is welded or bonded to the conductive portion.

[0035] In the above technical solution, the first end of the connecting harness is welded or bonded to the conductive portion, forming a sampling portion. The second end is electrically connected to the battery monitoring unit. Thus, the first end of the connecting harness can sample the voltage of the connected battery cell and transmit the sampled voltage information to the battery monitoring unit via the second end, ensuring accurate and stable sampling. The connecting harness simultaneously achieves voltage sampling while achieving electrical connection, saving components and installation space.

[0036] According to some embodiments of the present application, optionally, a corner space is formed at the corner of the shell along the third direction, the connecting wire harness is at least partially located in the corner space, the connecting wire harness extends along the second direction, and the first direction, the second direction and the third direction are arranged at angles to each other.

[0037] In the above technical solution, a transfer space is formed at the corner of the shell along the third direction, the connecting wire harness is at least partially located in the corner space, the connecting wire harness extends along the second direction, and the corner of the shell along the third direction also extends along the second direction, so that the connecting wire harness can extend in the corner space, thereby making full use of the volume space occupied by the battery cell to accommodate the connecting wire harness and improving space utilization.

[0038] According to some embodiments of the present application, optionally, the connecting harness is at least one of a flexible circuit board and a harness.

[0039] In the above technical solution, the connecting harness is at least one of a flexible circuit board and a harness. The connecting harness has good flexibility, so that the connecting harness is arranged in an irregular structural space between the ends of multiple shells and the battery monitoring unit, has good adaptability, and is conducive to saving installation space for the connecting harness.

[0040] According to some embodiments of the present application, optionally, all conductive parts of multiple battery cells of the battery cell group on the same side are arranged sequentially along the first direction, and along the third direction, the multiple conductive parts and the ends of the battery cell group form an accommodating gap, and the battery monitoring unit is arranged in the accommodating gap.

[0041] In the above technical solution, all the conductive parts of multiple battery cells located on the same side are arranged in sequence along the first direction and form an accommodating gap with the end of the battery cell group in the third direction. The battery monitoring unit is arranged in the accommodating gap and connected to the conductive part, so that the battery monitoring unit can use the accommodating gap as an installation space, making the structure of the battery device more compact and saving space, which in turn helps to improve the energy density of the battery device.

[0042] According to some embodiments of the present application, optionally, the battery device includes a battery monitoring unit and an electrical connector, the electrical connector is arranged in the accommodating gap and located between the conductive portion and the battery monitoring unit, and the electrical connector electrically connects the battery monitoring unit and the conductive portion.

[0043] In the above technical solution, the electrical connector is located between the conductive part and the battery monitoring unit and connects the conductive part and the battery monitoring unit, so that the conductive parts of multiple battery cells can be transferred to the battery monitoring unit through the electrical connector, further utilizing the space of the accommodation gap in the third direction, making the structure more compact, and saving the installation space required for the battery monitoring unit while realizing the electrical connection between the battery monitoring unit and multiple battery cells.

[0044] According to some embodiments of the present application, optionally, the battery device includes a main control board, and the battery monitoring unit is electrically connected to the main control board.

[0045] In the above technical solution, the battery device includes a main control board, the battery monitoring unit is electrically connected to the main control board, and the battery monitoring unit can collect the parameters of the battery cells, so that the main control board can accurately and reliably obtain the parameters of the battery cells and adjust the control strategy of the battery device in time according to the status of the battery cells.

[0046] According to some embodiments of the present application, optionally, the battery device includes a box body, the box body includes a bottom plate, and the accommodating gap is located between the bottom plate and the conductive part.

[0047] In the above technical solution, the battery device accommodates the battery cell group through a box body, and the box body can provide support and protection for the battery cells. The accommodating gap is located between the bottom plate and the conductive part of the box body, so that the boundary range of the accommodating gap in the third direction is relatively clear, and the bottom plate can provide support for the battery monitoring unit in the accommodating gap, so that the battery monitoring unit can be installed more stably in the accommodating gap.

[0048] According to some embodiments of the present application, optionally, the battery device includes a bracket connected to the box body, and the battery monitoring unit is installed on the bracket.

[0049] In the above technical solution, the battery monitoring unit is installed on the bracket by connecting the bracket to the box, so that the battery monitoring unit can be connected to the box through the bracket, thereby increasing the installation stability and reliability of the battery monitoring unit, and is beneficial to improving the overall rigidity and strength of the battery device.

[0050] According to some embodiments of the present application, optionally, the battery monitoring unit is bonded to a box wall of the box body.

[0051] In the above technical solution, the battery monitoring unit is bonded to the box wall of the box so that the battery monitoring unit and the box wall are connected as a whole, which is conducive to the integration of the battery monitoring unit and the box, saves space, facilitates the assembly of internal components of the battery device, and helps to provide insulation isolation protection between the battery monitoring unit and the box.

[0052] According to some embodiments of the present application, optionally, the length of the battery monitoring unit extends along the first direction.

[0053] In the above technical solution, the length of the battery monitoring unit extends along the first direction, and the accommodating gap also extends along the first direction, so that the battery monitoring unit can fully fill the space where the accommodating gap is located, thereby improving space utilization.

[0054] According to some embodiments of the present application, optionally, the shell is made of a soft outer packaging material, and in a first direction, a reinforcing partition is sandwiched between at least two adjacent battery cells, the reinforcing partition is connected to the shell, and the hardness of the reinforcing partition is greater than the hardness of the shell.

[0055] In the above technical solution, by arranging reinforcing partitions between adjacent battery cells and making the hardness of the reinforcing partitions greater than the hardness of the flexible shell, it is convenient to group multiple battery cells, and the overall stiffness of the battery cell group formed by grouping multiple battery cells can be improved, thereby facilitating the installation of the battery cell group formed by grouping multiple battery cells and reducing the deformation of the battery cells after grouping.

[0056] According to some embodiments of the present application, optionally, the thickness of the reinforcing separator is smaller than the thickness of the battery cell.

[0057] In the above technical solution, by making the thickness of the reinforcing partition smaller than the thickness of the battery cell, the overall stiffness of the group of multiple battery cells can be improved while the space occupied by the reinforcing partition can be reduced, especially the space occupied by the reinforcing partition in the thickness direction of the battery cell can be reduced, so that the overall energy density of the battery device is higher.

[0058] According to some embodiments of the present application, optionally, the reinforcing partition is a metal plate.

[0059] In the above technical solution, by setting the reinforcing partition to aluminum plate, aluminum alloy plate, copper plate or steel plate and other materials, the reinforcing partition can have higher strength and hardness, thereby better improving the overall stiffness of multiple battery cells in a group and better reducing the deformation of the grouped battery cells.

[0060] According to some embodiments of the present application, optionally, the reinforcing partition is a heat conductive member and is thermally connected to the housing.

[0061] In the above technical solution, by setting the reinforcing partition as a heat conductor and thermally connecting it to the shell, the reinforcing partition can enhance the overall stiffness of the battery cells after grouping, and at the same time, the reinforcing partition can have a thermal management function. By strengthening the heat exchange between the partition and the battery cells, the temperature of the battery cells can be adjusted so that the battery cells operate within a suitable temperature range.

[0062] According to some embodiments of the present application, optionally, the reinforced partition is a solid structure.

[0063] In the above technical solution, by setting the reinforcing partition as a solid structure, the reinforcing partition can have better structural strength and rigidity, and can play an effective reinforcing role when the thickness of the reinforcing partition is small, which is beneficial for the battery cell group as a whole to have better strength and rigidity while also having a higher volume energy density.

[0064] According to some embodiments of the present application, optionally, a cavity is formed in the reinforced partition.

[0065] In the above technical solution, by setting a cavity in the reinforcing partition, while the reinforcing partition plays a role in enhancing the overall stiffness of the battery cells after grouping, the cavity in the reinforcing partition can absorb the expansion and deformation of the battery cells. The cavity in the reinforcing partition can provide a buffer for the deformation of adjacent battery cells and is beneficial to reducing the weight of the reinforcing partition.

[0066] According to some embodiments of the present application, optionally, the cavity includes a heat exchange flow channel for the flow of a heat exchange medium.

[0067] In the above technical solution, at least part of the cavity in the reinforced partition constitutes a heat exchange channel. By flowing the heat exchange medium through the heat exchange channel in the reinforced partition, the heat exchange medium can exchange heat with the battery cell, thereby effectively regulating the battery cell temperature.

[0068] According to some embodiments of the present application, optionally, the reinforcing partition includes a connecting portion protruding from the shell along the second direction, and the connecting portion is located on a side of the conductive portion facing away from the battery monitoring unit.

[0069] In the above technical solution, by making the end of the reinforcing partition along the second direction protrude from the shell of the battery cell and be connected to the box body, since the reinforcing partition is clamped between multiple battery cells and grouped with multiple battery cells to form a battery cell group, and the overall hardness of the reinforcing partition is greater than that of the battery cell shell, the battery cell group as a whole has better strength and rigidity.

[0070] According to some embodiments of the present application, optionally, in the first direction, two adjacent reinforcing partitions are connected by a connecting plate, and the battery cell is accommodated in a space enclosed by the connecting plate and the two reinforcing partitions.

[0071] In the above technical solution, two adjacent reinforcing partitions are connected by a connecting plate, and the battery cell is accommodated in the space enclosed by the connecting plate and the two reinforcing partitions, thereby improving the strength of the reinforcing partition and further increasing the installation reliability and stability of the battery cell.

[0072] According to some embodiments of the present application, optionally, two adjacent reinforcing partitions in the first direction are formed into an integral structure with the connected connecting plate.

[0073] In the above technical solution, by forming two adjacent reinforcing partitions in the first direction and the connecting plate connecting the two reinforcing partitions into an integrated structure, the strength of the reinforcing partitions is further improved, thereby increasing the installation reliability and structural stability of the battery cell.

[0074] According to some embodiments of the present application, optionally, the electrode leads of two adjacent battery cells are directly connected.

[0075] In the above technical solution, by directly connecting the electrode leads of two adjacent battery cells in the battery cell group, the electrical connection devices between the battery cells can be omitted or reduced, the number of components in the battery cell group can be reduced, and the space occupied by the electrical connection devices can be saved, which is beneficial to improving the energy density of the battery cell group. In addition, since the electrical connection devices between the battery cells are omitted or reduced, the cost can also be reduced.

[0076] According to some embodiments of the present application, optionally, the electrode leads of two adjacent battery cells are connected by welding.

[0077] In the above technical solution, the electrode leads of two adjacent battery cells in the battery cell group are connected by welding, thereby achieving direct connection of the terminals of two adjacent battery cells in the battery cell group, making the connection method of the electrode leads of two adjacent battery cells in the battery cell group simple and reliable.

[0078] According to some embodiments of the present application, optionally, the electrode leads of two adjacent battery cells are directly connected by conductive glue.

[0079] In the above technical solution, the electrode leads of two adjacent battery cells in the battery cell group are connected by conductive glue, thereby achieving direct connection of the terminals of two adjacent battery cells in the battery cell group, making the connection method of the electrode leads of two adjacent battery cells in the battery cell group simple and reliable.

[0080] According to some embodiments of the present application, optionally, the plurality of battery cells are bonded and matched in sequence along a first direction, the battery cell having a first surface and a second surface, the second surface being adjacent to the first surface;

[0081] The battery device includes a box, an adhesive layer and a blocking member. The adhesive layer is arranged on one side of the battery cell group located on the first surface and is used to adhere multiple battery cells to the box. The blocking member is located between at least one battery cell at both ends of the battery cell group in the first direction and the adhesive layer, and is used to prevent the adhesive layer from overflowing from the first surface of the battery cell to the second surface of the corresponding battery cell.

[0082] In the above technical solution, by arranging a blocking member between at least one battery cell and the glue layer at both ends of the battery cell group in the first direction, the risk of glue overflowing from the first side of the battery cell to the second side during gluing can be reduced during the assembly stage of the battery device, and the probability of glue overflow forming a hard structure on the second side of the battery cell can be reduced, thereby improving the problem of local stress concentration on the surface of the battery cell, reducing the risk of damage to the battery cell, and enhancing the insulation between the first side of the battery cell and the box body, which is beneficial to improving the reliability of the battery cell and the reliability of the battery device.

[0083] According to some embodiments of the present application, optionally, the blocking member at least covers a corner position of the corresponding battery cell.

[0084] In the above technical solution, the blocking member covers the corner position of the corresponding battery cell, which can effectively reduce the probability of glue accumulation at the corner position of the outermost battery cell, play a better role in preventing glue overflow, and at the same time can also reduce the size of the blocking member and reduce the amount of material used. It can also leave a suitable amount of space on the first side for glue coating, thereby improving the bonding strength between the battery cell and the box.

[0085] According to some embodiments of the present application, optionally, the blocking member at least covers an edge position of the corresponding battery cell in the first direction.

[0086] In the above technical solution, the blocking member can reduce the risk of glue overflowing to the second surface of the battery cell with a larger area, thereby further reducing the risk of glue overflowing and forming a hard structure at the edge of the battery cell group, and further reducing the risk of damage to the battery cell, thereby improving the reliability of the battery device.

[0087] According to some embodiments of the present application, optionally, a blocking member is provided between two adjacent battery cells along the first direction.

[0088] In the above technical solution, a blocking member is provided between two adjacent battery cells, which can block glue that may overflow from the two opposite first surfaces of the two adjacent battery cells during gluing, thereby reducing the number of blocking members, streamlining components, and saving occupied space.

[0089] According to some embodiments of the present application, optionally, the battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

[0090] In the above technical solution, the use of the above-mentioned types of battery cells can provide more options for battery device design to meet different usage requirements. Among them, the battery cell is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity, and low internal resistance; the battery cell is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; the battery cell is a solid-state battery cell, which has the advantages of high energy density and reliability, light weight, and good high and low temperature performance.

[0091] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery device according to any of the above embodiments, and the battery device is used to provide electrical energy.

[0092] In the electrical device of the technical solution of the present application, at least two adjacent second sampling parts can collect parameters of two or more battery cells, so that the total number of sampling parts can be reduced accordingly, and the connecting wiring harness can also be shortened and streamlined, thereby saving space, helping to improve the energy density of the battery device, and reducing costs to a certain extent.

[0093] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0095] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application;

[0096] Figure 2 A partial structural schematic diagram of a battery device according to some embodiments of the present application;

[0097] Figure 3 for Figure 2 An enlarged schematic diagram of part A;

[0098] Figure 4 Schematic diagram of the three-dimensional structure of the battery cell of some embodiments of the present application;

[0099] Figure 5 This is a schematic structural diagram of a battery cell according to some embodiments of the present application, viewed from a first direction;

[0100] Figure 6Schematic cross-sectional view of a battery cell according to some embodiments of the present application;

[0101] Figure 7 A schematic diagram of the combination of a battery cell and a battery monitoring unit according to some embodiments of the present application;

[0102] Figure 8 Schematic diagram of the three-dimensional structure of the battery device according to some embodiments of the present application;

[0103] Figure 9 A schematic diagram of the structure of a battery device with the top cover removed according to some embodiments of the present application;

[0104] Figure 10 Schematic diagram of the structure of the battery device with the top cover removed according to other embodiments of the present application;

[0105] Figure 11 for Figure 10 An enlarged schematic diagram of part B;

[0106] Figure 12 A schematic diagram of a series connection path of multiple battery cells connected in series in some embodiments of the present application;

[0107] Figure 13 A schematic diagram of a series connection path of multiple battery cells connected in series in some other embodiments of the present application;

[0108] Figure 14 A schematic diagram of the connection between a battery monitoring unit and an electrical connector according to some embodiments of the present application;

[0109] Figure 15 This is a schematic structural diagram of a battery cell assembly according to some embodiments of the present application;

[0110] Figure 16 for Figure 15 An enlarged schematic diagram of part C;

[0111] Figure 17 Schematic cross-sectional view of a reinforced partition according to some embodiments of the present application;

[0112] Figure 18 This is a schematic diagram of the combination of a reinforced separator and a single battery cell in some embodiments of the present application;

[0113] Figure 19 is a schematic diagram of a battery cell assembly according to some embodiments of the present application;

[0114] Figure 20 yes Figure 19 The main view of the battery pack in FIG;

[0115] Figure 21 yes Figure 20 Enlarged view of part D in the middle;

[0116] Figure 22 An exploded diagram of the structure of a battery device provided in another embodiment of the present application;

[0117] Figure 23 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0118] Figure 24 Bottom view of the local structure of the battery device provided in some embodiments of the present application Figure 1 ;

[0119] Figure 25 A bottom view of the partial structure of a battery device provided in one embodiment of the present application Figure 2 .

[0120] The reference numerals in the specific embodiment are as follows:

[0121] 1000-Vehicle; 100-Battery Device; 200-Controller; 300-Motor;

[0122] 10-box; 10a-accommodation space; 101-box body; 102-heat exchange plate; 11-top cover; 12-bottom plate; 111-box wall; 17-bracket; 171-sub-bracket; 20-cell group; 201-accommodation gap; 202-battery row; 30-cell; 31-shell; 310-corner space; 311-first surface; 312-second surface; 33-conductive part; 331-lead-out part; 34-glue layer; 35-blocking member; 36-blocking member; 37-blocking member; 38-blocking member; 39-blocking member; 40-blocking member; 41-blocking member; 42-blocking member; 43-blocking member; 44-blocking member; 45-blocking member; 46-blocking member; 47-blocking member; 48-blocking member; 49-blocking member; 50-blocking member; 51-blocking member; 52-blocking member; 53-blocking member; 54-blocking member; 55-blocking member; 56-blocking member; 57-blocking member; 58-blocking member; 59-blocking member; 60-blocking member; 61-blocking member; 62-blocking member; 63-blocking member; 64-blocking member; 65-blocking member; 66-blocking member; 67-blocking member; 68-blocking member; 69-blocking member; 70-blocking member; 71-blocking member; 72-blocking member; 73-blocking member; 74-blocking member; 75-blocking member; 76-blocking member; 77-blocking member; 7 51-first part; 352-second part; 40-reinforced partition; 41-connecting part; 42-cavity; 43-heat exchange channel; 44-connecting plate; 61-battery monitoring unit; 611-connector; 62-electrical connector; 70-connecting harness; 71-first end; 72-second end; 80-sampling assembly; 81-first sampling part; 82-second sampling part; 91-first adapter line; 92-second adapter line; 921-output port. DETAILED DESCRIPTION

[0123] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0124] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0125] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0126] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0127] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0128] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0129] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0130] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0131] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0132] With market expansion and technological advancements, users are placing increasingly stringent demands on the performance and safety of power batteries. Power batteries often require frequent charging and discharging during operation, which can easily lead to problems such as excessive current or excessive temperatures, compromising safety. Collecting battery voltage and current parameters and transmitting them to the Battery Management System (BMS) provides a reference for its control strategies, enabling timely and effective protection. This has become a crucial method for ensuring battery safety.

[0133] In related technologies, battery devices typically include multiple cells arranged in a housing. To collect the cell voltage or current for reference by the battery management system, each cell's end is electrically connected to a battery monitoring unit (BMU). However, the multiple cells are electrically connected to the BMU in a many-to-one fashion, resulting in a large space occupied by the sampling components (including but not limited to conductive wires, connectors, etc.) and the BMU within the housing, thus limiting the battery device's energy density.

[0134] In view of the above situation, the present application provides a battery device, which includes a cell group and a sampling component. The cell group includes multiple cells connected in series, and the sampling component includes multiple sampling parts. On the series path of the multiple cells, the number of cells between the sampling points of at least two adjacent sampling parts is greater than or equal to two, so that the number of sampling parts can be reduced accordingly, so that the wiring harness connected to the sampling part can also be shortened and streamlined, thereby saving installation space, improving the energy density of the battery device, and reducing costs to a certain extent.

[0135] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery that can be recharged to activate the active material after the battery cell is discharged and can continue to be used.

[0136] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application may include multiple battery cell groups for providing voltage and capacity. The battery cell group (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, parallel, or hybrid via a busbar component.

[0137] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of batteries.

[0138] As an example, the battery cell group can be a battery module, which is composed of multiple batteries arranged and fixed to form an independent module. As an example, the battery module can be formed by engaging multiple battery cells with a mounting plate with a slot.

[0139] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell groups housed in the case.

[0140] As an example, the battery cell group may be a battery module, and the battery cell group may be accommodated in the box by fixing the battery module in the box.

[0141] As an example, the battery cell group may also be accommodated in the box by directly fixing the multiple battery cells to the box.

[0142] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0143] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0144] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0145] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0146] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0147] Please refer to Figures 2 to 3 The battery device 100 includes a cell group 20 and a sampling assembly 80, wherein the cell group 20 includes a plurality of cell 30 arranged in series. The sampling assembly 80 includes a plurality of sampling parts, a connecting harness 70, and an output port 921. Each sampling part is electrically connected to at least one connecting harness 70, and the plurality of connecting harnesses 70 are connected to the output port 921. The plurality of sampling parts include a first sampling part 81 and a second sampling part 82. The first sampling part 81 and the second sampling part 82 each have a sampling point that can be electrically connected to the series path of the cell 30. There are two first sampling parts 81, which are electrically connected to the cell 30 at the head end and the cell 30 at the tail end of the plurality of cell 30 connected in series, respectively. In addition, on the series path of the plurality of cell 30, the number of cell 30 between the sampling points of at least two adjacent second sampling parts 82 is greater than or equal to two.

[0148] The battery cell 30 includes a housing 31, an electrode assembly (not shown), and an electrolyte (not shown). The housing 31 is used to accommodate the electrode assembly and the electrolyte. The housing 31 can be flat, rectangular, cylindrical, or other shapes, which are not limited in this embodiment.

[0149] The electrode assembly consists of a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separator (not shown). Its operation primarily relies on the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together.

[0150] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0151] The sampling assembly 80 is used to collect parameters of the battery cells 30, including but not limited to current, voltage, and temperature. Among the multiple battery cells 30 connected in series, the leading battery cell 30 is the first battery cell 30 in the battery cell group 20, and the trailing battery cell 30 is the last battery cell 30 in the battery cell group 20. The sampling point can be the connection point between the sampling unit and the battery cell 30. The sampling point can be located on either the positive or negative tab of the battery cell 30.

[0152] The sampling assembly 80 can collect parameters of the battery cells 30 between the sampling points of the two sampling sections. Therefore, the two first sampling sections 81 are electrically connected to the first and last battery cells 30 in the series path of multiple battery cells 30, respectively. The first sampling section 81 can collect parameters of the entire series of battery cells 30. Two adjacent second sampling sections 82 can collect the number of all battery cells 30 between the sampling points of the two second sampling sections 82.

[0153] The number of the plurality of battery cells 30 may be two or more, that is, the number of the sampling parts is at least two and they are electrically connected to the head and tail ends of the two battery cells 30 connected in series, respectively.

[0154] On a series path of multiple battery cells 30, two adjacent sampling sections may be two first sampling sections 81, two second sampling sections 82, or one first sampling section 81 and one second sampling section 82. The number of battery cells 30 between the sampling points of two adjacent second sampling sections 82 may be one, two, three, or more, and the number of battery cells 30 between the sampling points of at least two adjacent second sampling sections 82 is greater than or equal to two.

[0155] On the series path of the plurality of battery cells 30, the number of battery cells 30 between the sampling points of at least two adjacent second sampling portions 82 is greater than or equal to two, which means that the number of battery cells 30 between the sampling points of the two adjacent second sampling portions 82 is greater than or equal to two. This situation can occur at one, two, three, or more locations. The number of battery cells 30 between each two adjacent second sampling portions 82 can be equal or unequal.

[0156] The number of battery cells 30 between the sampling points of two adjacent second sampling portions 82 may be less than or equal to the total number of battery cells 30 .

[0157] In the above technical solution, the sampling points of two adjacent second sampling parts 82 on the series path of multiple battery cells 30 can collect parameters of the battery cells 30 between the two sampling points. There are at least two adjacent second sampling parts 82 in the battery device that can collect parameters of two or more battery cells 30, so that the number of sampling parts can be reduced accordingly, so that the wiring harness connected to the sampling part can also be shortened and streamlined, thereby saving installation space, improving the energy density of the battery device, and reducing costs to a certain extent.

[0158] Reference Figure 12 According to some embodiments of the present application, optionally, on the series path of the plurality of battery cells 30 , the number of battery cells 30 between every two adjacent sampling points of the second sampling portions 82 is equal and greater than or equal to two.

[0159] Specifically, the number of cells 30 between the sampling points of every two adjacent second sampling portions 82 may be two, three, four or more. Figure 12 In the illustrated embodiment, the number of battery cells 30 between every two adjacent sampling points of the second sampling portions 82 is two.

[0160] In the above technical solution, on the series path of multiple battery cells 30, there are two battery cells 30 between the sampling points of every two adjacent second sampling parts 82. Compared with separately setting a sampling part at both ends of each battery cell 30, the number of sampling parts is reduced, and the sampling part can be connected to the battery monitoring unit 61 with a shorter wiring harness, thereby saving installation space and reducing costs to a certain extent.

[0161] Reference Figure 12 and Figure 13 According to some embodiments of the present application, optionally, on the series path of the plurality of battery cells 30 , there are one or more battery cells 30 between a sampling point of the first sampling portion 81 and a sampling point of an adjacent second sampling portion 82 .

[0162] For example, Figure 12 and Figure 13As shown, on a series path of multiple battery cells 30, a first sampling portion 81 is electrically connected to the battery cell 30 at the head end, and the sampling point of the second sampling portion 82 adjacent to the first sampling portion 81 is located between the battery cell 30 at the head end and the next battery cell 30. This allows a battery cell 30 to be located between the sampling points of the first sampling portion 81 and the adjacent second sampling portion 82. The first sampling portion 81 and the adjacent second sampling portion 82 can independently collect parameters of the battery cell 30 at the head end. In this embodiment, another first sampling portion 81 is electrically connected to the battery cell 30 at the tail end, and the sampling point of the second sampling portion 82 adjacent to the first sampling portion 81 can only be located between the sampling point of the first sampling portion 81 and the sampling point of the first sampling portion 81. This allows the sampling assembly 80 to independently collect parameters of the battery cell 30 at the tail end.

[0163] For another example, there are two or more battery cells 30 between the first sampling portion 81 electrically connected to the battery cell 30 at the head end and the adjacent second sampling portion 82 .

[0164] For another example, there are two or more battery cells 30 between the first sampling portion 81 electrically connected to the battery cell 30 at the tail end and the adjacent second sampling portion 82 .

[0165] In the above technical solution, on the series path of multiple battery cells 30, the number of battery cells 30 between the sampling points of adjacent second sampling parts 82 can be one or more, thereby saving space while improving the sampling accuracy, and the distribution positions of the sampling points can flexibly adapt to various arrangements of the battery cells 30.

[0166] Reference Figure 12 and Figure 13 According to some embodiments of the present application, optionally, multiple battery cells 30 are arranged into a battery row 202 along the first direction, the battery cell group 20 includes at least one battery row 202, the sampling points of the two first sampling parts 81 are respectively located on both sides of the battery cell group 20 along the second direction, and the sampling points of the second sampling part 82 are distributed on the same side or different sides of the battery row 202 in the second direction, and the second direction forms an angle with the first direction.

[0167] The first direction may refer to the direction e1 in the accompanying drawings, and the second direction may refer to the direction e2 in the accompanying drawings. The first direction e1 may refer to one of the length direction, width direction, and thickness direction of the housing 31. For example, referring to Figure 3 The first direction e1 may refer to the thickness direction of the shell 31 , and the second direction e2 may refer to the length direction of the shell 31 . The first direction e1 and the second direction e2 may be perpendicular to each other.

[0168] For example, Figure 12 and Figure 13As shown, the battery pack 20 includes two battery rows 202 arranged along the second direction. Two adjacent battery cells 30 along the second direction are connected in series. The sampling points of the two first sampling units 81 are located on opposite sides of all battery cells 30 in the battery pack 20 along the second direction. The ends of the battery cells 30 to which the sampling points of the two first sampling units 81 are connected have opposite polarities. Furthermore, the sampling points of the two first sampling units 81 can be located at the two ends farthest apart along the first direction.

[0169] like Figure 12 As shown, the sampling points of all the second sampling portions 82 are distributed on the same side of one of the battery rows 202 in the second direction.

[0170] like Figure 13 As shown, the sampling points of the second sampling portion 82 are distributed on both sides of one of the battery rows 202 in the second direction, and are located on one side of another battery row 202 in the second direction.

[0171] The sampling points of the plurality of second sampling portions 82 located on the same side of the battery row 202 in the second direction may be spaced apart along the first direction, thereby increasing the number of battery cells 30 between two adjacent sampling points on a series connection path of the plurality of battery cells 30 .

[0172] In the above technical solution, the sampling points of the two first sampling parts 81 are respectively located on both sides of the battery cell group 20 along the second direction. On the series path of multiple battery cells 30, the number of battery cells 30 between the sampling points of adjacent second sampling parts 82 can be one or more, thereby saving space while ensuring that the parameters of all battery cells 30 are collected and improving the sampling accuracy to a certain extent.

[0173] According to some embodiments of the present application, optionally, there are multiple battery rows 202, and the multiple battery rows 202 are arranged along the second direction and / or the third direction. The sampling points of the second sampling portion 82 are distributed on at least one side of one of the battery rows 202 along its own arrangement direction, and angles are formed between the first direction, the second direction, and the third direction.

[0174] Specifically, the number of battery rows 202 can be two or more, and the multiple battery rows 202 can be arranged along the second direction. The multiple battery rows 202 arranged along the second direction can be connected in series by sequentially connecting the battery cells 30 adjacent to each other in the second direction. Alternatively, each battery row 202 can be connected in series by sequentially connecting the battery cells 30 adjacent to each other in the first direction and then connecting them in series with another battery row 202 at the leading or trailing end in the first direction. The multiple battery rows 202 can also be arranged along the third direction, or arranged in a three-dimensional array along the second and third directions.

[0175] In this embodiment, the two first sampling parts 81 are electrically connected to the two battery cells 30 at the head end and the tail end of the series path of all the battery cells 30 , ensuring that all the battery cells 30 can be sampled.

[0176] For example, multiple battery rows 202 are arranged along the second direction. The multiple battery rows 202 can be connected in series by sequentially connecting adjacent battery cells 30 in the second direction. The sampling points of the second sampling unit 82 can be distributed on one side of one of the multiple battery rows 202 along the second direction. In this embodiment, the sampling points of two adjacent second sampling units 82 along the first direction can collect parameters of all battery cells 30 located in the same column along the second direction, thereby significantly reducing the number of sampling units.

[0177] In the above technical solution, the sampling points of the second sampling portion 82 are distributed on at least one side of one of the battery rows 202 along its own arrangement direction, thereby saving the installation space of the sampling component 80, and the distribution position of the sampling points can flexibly adapt to various arrangements of the battery cells 30.

[0178] Reference Figure 12 According to some embodiments of the present application, optionally, the number of battery rows 202 is two and the two battery rows 202 are arranged along the second direction, and the sampling points of the second sampling portion 82 are distributed between the two battery rows 202 .

[0179] Specifically, two battery cells 30 arranged side by side along the second direction in two battery rows 202 are connected in series. The sampling points of the second sampling portion 82 are distributed between the two battery rows 202. There is a battery cell 30 between each first sampling portion 81 and the sampling point of an adjacent second sampling portion 82. The two battery cells 30 located between the sampling points of the first sampling portion 81 and the second sampling portion 82 are respectively the battery cell 30 at the leading end and the battery cell 30 at the trailing end of the battery cell group 20. The sampling point of the second sampling portion 82 is located between the two battery rows 202, so that along the path along which the multiple battery cells 30 are connected in series, there are two battery cells 30 between each two adjacent sampling points of the second sampling portion 82.

[0180] In this embodiment, the first sampling portion 81 and the adjacent second sampling portion 82 can separately collect parameters of the two battery cells 30 at the head end and the tail end, while every two adjacent second sampling portions 82 along the path of multiple battery cells 30 connected in series collect parameters of the two battery cells 30 between the two second sampling portions 82.

[0181] In the above technical solution, the sampling points of the second sampling portion 82 are distributed between two adjacent battery rows 202, thereby concentrating the positions of the second sampling portion 82, which is beneficial to saving the installation space of the sampling component 80 and facilitating wiring and assembly.

[0182] Reference Figure 13 According to some embodiments of the present application, optionally, the number of battery rows 202 is two, the two battery rows 202 are arranged along the second direction, and the sampling points of the second sampling portion 82 are distributed on both sides of one of the battery rows 202 along the second direction.

[0183] Specifically, the two battery rows 202 are a first battery row 202 and a second battery row 202. The first battery row 202 has sampling points of the second sampling portion 82 distributed on both sides along the second direction, while the second battery row 202 has second sampling points distributed only on the side closest to the first battery row 202. In this embodiment, the output port 921 can be positioned near the side of the first battery row 202 along the second direction to simplify wiring and shorten the overall length of the connection harness 70.

[0184] Furthermore, a second sampling unit 82 may be provided with a sampling point on each side of each battery cell 30 in the first battery row 202 to collect parameters of each battery cell 30 in the first battery row 202 and improve sampling accuracy. In the second battery row 202, the second sampling unit 82 samples each pair of adjacent battery cells 30 along the series path.

[0185] In other embodiments, two or more battery cells 30 may be spaced between sampling points on the same side of the first battery row 202. Because the sampling points on both sides of the first battery row 202 are more densely distributed than the sampling points on both sides of the second battery row 202, the sampling accuracy of the first battery row 202 can be improved while reducing the total number of sampling points.

[0186] In the above technical solution, the sampling points of the second sampling unit 82 are distributed on both sides of one of the battery rows 202 along the second direction, so each battery cell 30 in the battery row 202 can be sampled individually, thereby locally improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy according to the sampling parameters.

[0187] See also Figure 12 According to some embodiments of the present application, optionally, multiple battery cells 30 are arranged into battery rows 202 along the first direction, the number of battery rows 202 is at least two groups, at least two groups of battery rows 202 are arranged along the second direction, and the battery monitoring unit 61 is arranged on one side of all battery rows 202 or in the middle of two adjacent battery rows 202 along the second direction, and the first direction and the second direction are arranged at an angle.

[0188] In the above technical solution, multiple battery cells 30 are arranged into battery rows 202 along the first direction, and the number of battery rows 202 is at least two groups, which can increase the overall output voltage of the battery device. Along the second direction, the battery monitoring unit 61 is arranged between two groups of battery cell groups 20 or on one side of all the battery cell groups 20, thereby making the structure more compact and saving space in the second direction.

[0189] According to some embodiments of the present application, optionally, the battery cell 30 includes a shell 31 and a conductive portion 33, the conductive portion 33 is arranged at the end of the shell 31 along the second direction, the conductive portions 33 of two adjacent battery cells 30 along the second direction are connected, and the first end 71 of the connecting harness 70 is connected to a portion of the conductive portion 33 to form a sampling portion.

[0190] In the above technical solution, the conductive parts 33 of two adjacent battery cells 30 arranged along the second direction are connected, which can eliminate or reduce the electrical connection devices between the battery cells 30, reduce the number of components of the battery cell group 20, thereby saving the space occupied by the electrical connection devices, and is conducive to improving the energy density of the battery cell group 20. The conductive part 33 is connected to the first end part 71 of the connecting harness 70 to form a sampling part, which simplifies the structure of the sampling part.

[0191] According to some embodiments of the present application, optionally, the battery cell group 20 includes a plurality of battery cells 30 arranged along a first direction, each battery cell 30 includes a shell 31 and a conductive part 33, the conductive part 33 is arranged at the end of the shell 31 along the second direction, and all the conductive parts 33 of the multiple battery cells 30 on the same side of the battery cell group 20 are arranged in sequence along the first direction, and along the third direction, the multiple conductive parts 33 and the end of the battery cell group 20 form a accommodating gap 201; the battery monitoring unit 61 is arranged in the accommodating gap 201 and is electrically connected to the conductive part 33; the first direction, the second direction and the third direction are arranged at an angle to each other.

[0192] The first direction may refer to direction e1 in the accompanying drawings, the second direction may refer to direction e2 in the accompanying drawings, and the third direction may refer to direction e3 in the accompanying drawings. In some implementations of the present application, the first direction, the second direction, and the third direction may be arranged perpendicular to each other.

[0193] The conductive portion 33 is electrically connected to the electrode assembly and is at least partially exposed outside the shell 31. In the present application, the battery cell 30 can be a battery cell using a soft outer packaging material as the shell 31. The shell 31 is a flexible structure, for example, the shell 31 can be made of an aluminum-plastic film.

[0194] The conductive portion 33 of the battery cell 30 is connected to the tab, and at least part of the conductive portion 33 is located outside the shell 31 to serve as a lead-out structure of the electrode assembly. The conductive portion 33 can be used to electrically connect the battery cell 30 to other battery cells 30 or other components.

[0195] Because the outer shell 31 of the battery cell 30 is a flexible structure, it is difficult to maintain a stable, solid outer contour. The outer contour of the shell 31 can be approximately a flat rectangular parallelepiped, and the battery cells 30 can be arranged with the thickness, length, and width of the shell 31 generally parallel to the first, second, and third directions, respectively. The multiple battery cells 30 are arranged sequentially along their thickness. In other words, the outer contour of the shell 31 in the second direction (the length of the shell 31) can be significantly larger than the outer contour (width and thickness) in the first and third directions, and the outer contour of the shell 31 in the third direction (width) is also larger than the outer contour (thickness) in the first direction.

[0196] Reference Figures 3 to 5 The conductive portions 33 may be provided at both ends of the battery cell 30 along the second direction. The conductive portions 33 may at least partially protrude from the end of the housing 31 along the second direction. The portion of the conductive portions 33 protruding from the housing 31 in the third direction and spaced from one end of the battery cell pack 20 along the third direction form a receiving gap 201. In the third direction, the distance between the conductive portions 33 and the end of the battery cell pack 20, i.e., the width of the receiving gap 201, is greater than or equal to the size of the battery monitoring unit 61 in the third direction.

[0197] Optionally, refer to Figure 7 The distance that the conductive portion 33 protrudes from the end of the housing 31 along the second direction is greater than or equal to the size of the battery monitoring unit 61 in the second direction.

[0198] As will be readily understood, the conductive portion 33 at least partially protrudes from the end of the housing 31, allowing the space occupied by the battery cell 30 in the battery device 100 to expand further outward beyond the volume of the housing 31. The accommodation gap 201 formed between the conductive portion 33 and the end of the battery cell 30 in the third direction is contained within the space occupied by the battery cell 30. Compared to technologies in which the battery monitoring unit 61 is disposed outside the space occupied by the battery cell 30, the battery monitoring unit 61 provided in the embodiment of the present application is disposed within the accommodation gap 201. In other words, the battery monitoring unit 61 is installed within the space occupied by the battery cell 30, resulting in a more compact structure, improved space utilization, and, consequently, a higher capacity density of the battery device 100.

[0199] Optionally, refer to Figure 9 In the same battery cell group 20, all conductive portions 33 on the same side can be arranged sequentially along the first direction and aligned along the third direction. In other words, the portions of the conductive portions 33 protruding from the housing 31 are equidistant from the end of the battery cell group 20 along the third direction.

[0200] The battery monitoring unit 61 may be directly connected to the conductive portion 33 or indirectly connected to the conductive portion 33 via a connecting harness 70 such as a wire or a connector. Each battery cell 30 in the battery device 100 may be electrically connected to the battery monitoring unit 61 .

[0201] In the battery device 100 of the embodiment of the present application, the multiple battery cells 30 of the battery cell group 20 are arranged along the first direction, and the ends of the battery cells 30 along the second direction are provided with conductive parts 33. All the conductive parts 33 of the multiple battery cells 30 on the same side are arranged in sequence along the first direction, and all the conductive parts 33 on this side form a receiving gap 201 together with the ends of the battery cell group 20 in the third direction. The battery monitoring unit 61 is arranged in the receiving gap 201 and connected to the conductive part 33, so that the battery monitoring unit 61 can use the receiving gap 201 as an installation space, making the structure of the battery device 100 more compact and saving space, thereby helping to improve the energy density of the battery device 100.

[0202] The battery monitoring unit 61 is used to collect parameters such as voltage, current, and temperature of a single or multiple battery cells 30. Accordingly, the battery monitoring unit 61 may include detection units such as voltage sensors, current sensors, and / or temperature sensors. The battery monitoring unit 61 also includes a slave controller 200 (CSC, Cell Supervision Circuit), which is used to transmit the parameters of the battery cells 30 to the main control board (BMU, Battery Management Unit).

[0203] Reference Figure 3 In one specific embodiment, the battery device 100 includes a battery monitoring unit 61 and an electrical connector 62. The battery monitoring unit 61 is disposed in the accommodation gap 201 formed by the conductive portion 33 on both sides of the battery cell 30 in the second direction. In this embodiment, the battery device 100 includes a second adapter cable 92. One end of the second adapter cable 92 is connected to the battery monitoring unit 61, and the other end is connected to the electrical connector 62, thereby achieving an electrical connection between the battery monitoring unit 61 and the electrical connector 62.

[0204] In this embodiment, optionally, the battery monitoring unit 61 and the electrical connector 62 are respectively located in the accommodation gap 201 formed on the upper side and the lower side of the conductive portion 33 along the third direction.

[0205] Reference Figure 7 The battery device 100 includes a battery monitoring unit 61 and an electrical connector 62. The battery monitoring unit 61 and the electrical connector 62 are connected together and housed together in the receiving gap 201. The battery cell 30 is electrically connected to the electrical connector 62 and establishes an electrical connection with the battery monitoring unit 61 through the electrical connector 62, so that the battery monitoring unit 61 can receive parameters of the battery cell 30.

[0206] In this embodiment, optionally, the electrical connector 62 is connected to the battery control unit by plugging, thereby improving connection reliability and saving installation space.

[0207] In the above technical solution, the battery device 100 includes a battery monitoring unit 61 and / or an electrical connector 62. One of the battery monitoring unit 61 and the electrical connector 62 is electrically connected to the conductive portion 33, so that the battery monitoring unit 61 and / or the electrical connector 62 can be electrically connected to the battery cell 30 through the conductive portion 33. Therefore, the battery management system can monitor and adjust the battery cell group 20 through the battery monitoring unit 61. In addition, the battery monitoring unit 61 can further obtain parameters of the battery cell 30 for the battery management system to use as a reference for management strategies.

[0208] Reference Figure 7 According to some embodiments of the present application, optionally, the battery device 100 includes a battery monitoring unit 61 and an electrical connector 62, the electrical connector 62 is located between the conductive portion 33 and the battery monitoring unit 61, and the electrical connector 62 electrically connects the battery monitoring unit 61 and the conductive portion 33.

[0209] Specifically, the electrical connector 62 and the battery monitoring unit 61 are housed together in the accommodation gap 201. The multiple conductive portions 33, the electrical connector 62, and the battery monitoring unit 61 located on the same side can be stacked along the third direction. The electrical connector 62 can be connected to the multiple conductive portions 33 via a connecting wire harness 70, or it can be directly connected to a portion of the multiple conductive portions 33. The electrical connector 62 and the battery monitoring unit 61 can be connected to each other via electrical terminals, a wiring harness, or a mortise and tenon joint.

[0210] In the above technical solution, the electrical connector 62 is located between the conductive part 33 and the battery monitoring unit 61 and connects the conductive part 33 and the battery monitoring unit 61, so that the conductive parts 33 of multiple battery cells 30 can be transferred to the battery monitoring unit 61 through the electrical connector 62, further utilizing the space of the accommodating gap 201 in the third direction, making the structure more compact, and saving the installation space required for the battery monitoring unit 61 while realizing the electrical connection between the battery monitoring unit 61 and multiple battery cells 30.

[0211] According to some embodiments of the present application, optionally, the battery device 100 includes a main control board (not shown), and the battery monitoring unit 61 is electrically connected to the main control board.

[0212] Specifically, the main control board may integrate the structures and electronic components that implement various control functions in the battery management system. The battery monitoring unit 61 is electrically connected to the conductive portion 33 to collect parameters such as the current, voltage, and temperature of the battery cells 30. The battery monitoring unit 61 may include a slave controller 200. The battery monitoring unit 61 may be connected to the main control board via a communication harness to transmit the battery cell 30 parameters to the main control board.

[0213] In the above technical solution, the battery device 100 includes a main control board, and the battery monitoring unit 61 includes a battery monitoring unit 61. The battery monitoring unit 61 is electrically connected to the main control board, and the battery monitoring unit 61 can collect the parameters of the battery cell 30, so that the main control board can accurately and reliably obtain the parameters of the battery cell 30, and adjust the control strategy of the battery device 100 in time according to the status of the battery cell 30.

[0214] See also Figure 7-10 According to some embodiments of the present application, optionally, the battery device 100 includes a box body 10 , the box body 10 includes a bottom plate 12 , and the accommodating gap 201 is located between the bottom plate 12 and the conductive portion 33 .

[0215] Specifically, the housing 10 has a storage space 10a, and the battery cell assembly 20 is disposed within the storage space 10a. The storage space 10a may refer to the space defined within the housing 10 for accommodating the battery cell assembly 20 and other components. The shape of the housing 10 may be, but is not limited to, a rectangular parallelepiped, a cube, a cylinder, etc. The material of the housing 10 may be, but is not limited to, a metal or a non-metallic material. Metal materials may include, but are not limited to, aluminum alloys and stainless steel, etc. Non-metallic materials may include, but are not limited to, plastics and carbon fiber composite materials, etc.

[0216] As an example, the housing 10 may include a first housing and a second housing. The first and second housings engage to form an enclosed space within the housing 10 for accommodating the battery cell assembly 20. Enclosed herein means covered or closed, and may be sealed or unsealed. The first housing may be a top cover 11 or a bottom plate 12.

[0217] As an example, the box body 10 may include a top cover 11, a frame, and a bottom plate 12. The top cover 11 and the bottom plate 12 are respectively connected to the frame, so that a closed space is formed inside the box body 10 to accommodate the battery cell group 20.

[0218] In some embodiments, the box 10 may serve as part of the chassis structure of the vehicle 1000. For example, a portion of the box 10 may form at least a portion of the floor of the vehicle 1000, or a portion of the box 10 may form at least a portion of the cross member and longitudinal member of the vehicle 1000.

[0219] Optionally, the top cover 11 and the bottom plate 12 are opposite to each other along the third direction, the battery cell group 20 is located in the area where the top cover 11 and the bottom plate 12 are opposite to each other, and one end of the battery cell group 20 in the third direction abuts against or is arranged close to the top cover 11, and the other end of the battery cell group 20 in the third direction abuts against the bottom plate 12. The conductive portion 33 and the end of the battery cell group 20 abutting against the bottom plate 12 in the third direction form a receiving gap 201. The conductive portion 33 protrudes from the end of the housing 31 along the second direction, and the conductive portion 33 and the bottom plate 12 are opposite to and spaced apart in the third direction, jointly limiting the boundary range of the receiving gap 201. In this embodiment, the battery cell group 20 can be fixedly connected to the bottom plate 12.

[0220] Furthermore, in the third direction, the conductive part 33 is arranged close to the top cover 11, that is, the distance between the conductive part 33 and the end of the battery cell group 20 close to the top cover 11 is smaller than the distance between the conductive part 33 and the end of the battery cell group 20 close to the bottom plate 12, so as to increase the spatial range of the accommodating gap 201.

[0221] In the above technical solution, the battery device 100 accommodates the battery cell group 20 through the box body 10, and the box body 10 can provide support and protection for the battery cell 30. The accommodating gap 201 is located between the bottom plate 12 and the conductive part 33 of the box body 10, so that the boundary range of the accommodating gap 201 in the third direction is relatively clear, and the bottom plate 12 can provide support for the battery monitoring unit 61 in the accommodating gap 201, so that the battery monitoring unit 61 is installed more stably in the accommodating gap 201.

[0222] Reference Figure 3 and Figure 7 According to some embodiments of the present application, optionally, the battery device 100 includes a bracket 17 connected to the box body 10 , and the battery monitoring unit 61 is installed on the bracket 17 .

[0223] Specifically, the bracket 17 is located on at least one side of the battery cell group 20 along the second direction. The bracket 17 may be located on one side of the battery cell group 20 along the second direction, or on both sides of the battery cell group 20 along the second direction. The battery monitoring unit 61 may be connected to the bracket 17 by at least one of welding, screwing, riveting, snap-fit ​​connection, adhesive connection, fastener connection, etc. The battery monitoring unit 61 and the bracket 17 may be fixedly connected in a detachable manner.

[0224] Optionally, the bracket 17 includes a plurality of sub-brackets 171. The sub-brackets 171 of the bracket 17 can be arranged along a first direction, and two adjacent sub-brackets 171 can be connected. The sub-brackets 171 can be independently formed, for example, two adjacent sub-brackets 171 can be connected by welding, structural adhesive, or fasteners; or, the sub-brackets 171 can be integrally formed.

[0225] Two adjacent sub-brackets 171 may form a continuous installation space along the extension direction (eg, the first direction) of the battery monitoring unit 61 to accommodate the battery monitoring unit 61 .

[0226] In the above technical solution, the battery monitoring unit 61 is connected to the box body 10 through the bracket 17, and is installed on the bracket 17, so that the battery monitoring unit 61 can be connected to the box body 10 through the bracket 17, thereby increasing the installation stability and reliability of the battery monitoring unit 61, and is beneficial to improving the overall rigidity and strength of the battery device 100.

[0227] According to some embodiments of the present application, optionally, the battery monitoring unit 61 is bonded to the box wall 111 of the box body 10 .

[0228] Specifically, the housing 10's walls 111 enclose the housing space 10a. The walls 111 may be any wall surface of the housing 10 in the first, second, or third directions. The battery monitoring unit 61 is disposed within the housing gap 201, with at least one surface facing the housing 10. The surface of the battery monitoring unit 61 facing the housing 10 may be bonded to the inner wall of the housing 10.

[0229] Illustratively, the conductive portion 33, the end of the housing 31 along the second direction, and the bottom plate 12 collectively form a receiving gap 201. The battery monitoring unit 61 is received in the receiving gap 201. The battery monitoring unit 61 is positioned between the conductive portion 33 and the bottom plate 12 in the third direction and between the side wall of the housing 10 and the housing 31 in the second direction. The battery monitoring unit 61 may be directly connected to the bottom plate 12 and / or directly connected to the opposite wall 111 of the housing 10 in the second direction.

[0230] The battery monitoring unit 61 can be connected to the box wall 111 of the box body 10 by structural adhesive, glue, adhesive film, etc.

[0231] In the above technical solution, the battery monitoring unit 61 is bonded to the box wall 111 of the box body 10 so that the battery monitoring unit 61 and the box wall 111 of the box body 10 are connected as a whole, which is conducive to the integration of the battery monitoring unit 61 and the box body 10, saves space, and facilitates the assembly of internal components of the battery device 100, and helps to provide insulation isolation protection between the battery monitoring unit 61 and the box body 10.

[0232] Reference Figure 2 According to some embodiments of the present application, optionally, the length of the battery monitoring unit 61 extends along the first direction.

[0233] Specifically, combined Figure 7The accommodation gap 201 is formed between the conductive portion 33 and the base plate 12 along the third direction. Multiple conductive portions 33 on the same side are arranged sequentially along the first direction, so that the accommodation gap 201 formed by the conductive portions 33 on the same side extends along the first direction. The battery monitoring unit 61 is disposed in the accommodation space 10a and extends along the extension direction of the accommodation gap 201, that is, along the first direction. The outer contour of the battery monitoring unit 61 can be an elongated plate or strip.

[0234] In the above technical solution, the length of the battery monitoring unit 61 extends along the first direction, and the accommodating gap 201 also extends along the first direction, so that the battery monitoring unit 61 can fully fill the space where the accommodating gap 201 is located, thereby improving space utilization.

[0235] Reference Figure 2 and Figure 9 According to some embodiments of the present application, optionally, there are multiple battery cell groups 20, and the multiple battery cell groups 20 are arranged along the second direction, and the battery monitoring unit 61 is arranged between two battery cell groups 20 or on one side of all the battery cell groups 20.

[0236] Specifically, the plurality of cell groups 20 may be electrically connected to the battery monitoring unit 61. The number of battery cells 30 may be two, three, or more. The plurality of battery cells 30 in each cell group 20 are arranged along a first direction, and the ends of the battery cells 30 on the same side in a second direction may be aligned along the second direction.

[0237] For example, there are two battery cell groups 20 , and the battery monitoring unit 61 may be disposed on one of two opposite sides of the two battery cell groups 20 along the second direction.

[0238] Exemplarily, there are two battery cell groups 20, and the conductive parts 33 of the two battery cell groups 20 close to each other along the second direction form a receiving gap 201 in the third direction, and the battery monitoring unit 61 is arranged in the receiving gap 201 on the side of the two battery cell groups 20 close to each other.

[0239] For example, the number of the battery cell groups 20 is three, and the battery monitoring unit 61 may be disposed on a side of the first or last battery cell group 20 along the second direction that is away from the other battery cell groups 20 .

[0240] Exemplarily, there are three battery cell groups 20 , and the battery monitoring unit 61 is disposed between two of the battery cell groups 20 .

[0241] In the above technical solution, there are multiple battery cell groups 20, which can increase the overall output voltage of the battery device 100. Along the second direction, the battery monitoring unit 61 is arranged between two groups of battery cell groups 20 or on one side of all the battery cell groups 20, thereby making the structure more compact and saving space in the second direction.

[0242] Reference Figure 3 and Figure 7 According to some embodiments of the present application, optionally, the battery monitoring unit 61 includes a battery monitoring unit 61 , and at least one conductive portion 33 of each battery cell 30 is electrically connected to the battery monitoring unit 61 through a connecting harness 70 .

[0243] Specifically, each battery cell 30 may be provided with two conductive portions 33, one of which is a positive conductive portion and the other is a negative conductive portion. One of the two conductive portions 33 of the battery cell 30 is located on one side of the battery cell 30 along the second direction, and the other of the two conductive portions 33 of the battery cell 30 is located on the other side of the battery cell 30 along the second direction. The size of the battery cell 30 in the second direction may be significantly larger than the sizes in the first and second directions. That is, the length direction of the battery cell is parallel to the second direction; the two conductive portions 33 of the battery cell 30 are located on opposite sides of the length direction of the battery cell 30.

[0244] Exemplarily, among multiple battery cells 30, one of the two conductive parts 33 of each battery cell 30 is connected to the connecting harness 70 and electrically connected to the battery monitoring unit 61 through the connecting harness 70; the other one of the two conductive parts 33 of the battery cell 30 is not electrically connected to the connecting harness 70 and the battery monitoring unit 61.

[0245] Exemplarily, in the plurality of battery cells 30 , the two conductive parts 33 of each battery cell 30 are connected to the connection harness 70 and electrically connected to the battery monitoring unit 61 through the connection harness 70 .

[0246] Illustratively, among the multiple battery cells 30 , the conductive parts 33 at both ends of some battery cells 30 are connected to the connecting harness 70 and electrically connected to the battery monitoring unit 61 , while only one conductive part 33 of other battery cells 30 is connected to the connecting harness 70 .

[0247] In the above technical solution, at least one conductive part 33 of each battery cell 30 is electrically connected to the battery monitoring unit 61 through a connecting harness 70, so that the battery monitoring unit 61 can establish an electrical connection with each battery cell 30, so that the battery monitoring unit 61 can monitor the status of each battery cell 30 and improve the precision of monitoring and management of the battery management system.

[0248] Reference Figure 4-Figure 6According to some embodiments of the present application, optionally, a corner space 310 is formed at a corner of the shell 31 along the third direction, the connecting harness 70 is at least partially located in the corner space 310, and the connecting harness 70 extends along the second direction.

[0249] Specifically, the housing 31 includes a first surface 311 and a second surface 312 connected to each other. The first surface 311 is parallel to the plane in which the first and second directions are located, and the second surface 312 is parallel to the plane in which the second and third directions are located. The connection between the first surface 311 and the second surface 312 is located at the end of the second surface 312 along the third direction, and forms an arc transition surface. The arc transition surface at the connection between the first surface 311 and the second surface 312 extends along the second direction, and the arc transition surface and the outer extension planes of the first surface 311 and the second surface 312 together define a corner space 310. The ends of the connecting harness 70 can be connected to the battery monitoring unit 61 and the conductive part 33 respectively. The portion of the connecting harness 70 between the two ends of the conductive part 33 and the battery monitoring unit 61 extends along the second direction and is accommodated in the corner space 310.

[0250] Furthermore, the connecting harness 70 can fit against the outer wall surface of the housing 31 in the corner space 310 .

[0251] In the above technical solution, a corner space 310 is formed at the corner of the shell 31 along the third direction, and the connecting harness 70 is at least partially located in the corner space 310. The connecting harness 70 extends along the second direction, and the corner of the shell 31 along the third direction also extends along the second direction, so that the connecting harness 70 can extend in the corner space 310, thereby making full use of the volume space occupied by the battery cell 30 to accommodate the connecting harness 70, thereby improving space utilization.

[0252] Reference Figure 3 and Figure 7 According to some embodiments of the present application, optionally, the connecting harness 70 includes a first end 71 and a second end 72 relative to each other, the first end 71 is welded or bonded to the conductive part 33, and the second end 72 is electrically connected to the battery monitoring unit 61.

[0253] Specifically, the first end 71 and the second end 72 are two opposing ends of the connection harness 70 along the second direction. The first end 71 can be welded to the portion of the conductive portion 33 protruding from the housing 31, or can be bonded to the portion of the conductive portion 33 protruding from the housing 31 using conductive adhesive or insulating tape. The second end 72 can be directly connected to the battery monitoring unit 61 or indirectly connected to the battery monitoring unit 61 via the electrical connector 62.

[0254] In the above technical solution, by welding or bonding the first end 71 of the connecting harness 70 to the conductive portion 33, the stability of the connection between the first end 71 of the connecting harness 70 and the conductive portion 33 can be improved. The second end 72 is electrically connected to the battery monitoring unit 61, so that the first end 71 of the connecting harness 70 can sample the voltage of the connected battery cell 30 and transmit the sampled voltage information to the battery monitoring unit 61 through the second end 72, ensuring accurate and stable sampling. The connecting harness 70 realizes voltage sampling while achieving electrical connection, which can save the number of components and installation space.

[0255] According to some embodiments of the present application, optionally, the second end 72 is connected to the battery monitoring unit 61 by welding.

[0256] In the above technical solution, the second end portion 72 is connected to the battery monitoring unit 61 by welding, which helps to reduce the number of adapters and wiring harnesses and save installation space.

[0257] According to some embodiments of the present application, optionally, the second end 72 is connected to the output port 921 , the battery monitoring unit 61 is provided with a connector, and the output port 921 is plugged into the connector.

[0258] In the above technical solution, the second end portion 72 is plug-connected to the battery monitoring unit 61 via the output port 921 and the connector, thereby improving the connection reliability between the connecting harness 70 and the battery monitoring unit 61 .

[0259] In some embodiments, the portion of the connecting harness 70 between the first end 71 and the second end 72 may be fixedly connected to the housing 31 via a fixing member (not shown). There may be multiple fixing members, which are spaced apart along the extension direction of the connecting harness 70. The fixing members include, but are not limited to, tape, structural adhesive, cable ties, and cable ties.

[0260] Reference Figure 14 According to some embodiments of the present application, optionally, the battery monitoring unit 61 includes an electrical connector 62, the battery device 100 includes a first adapter wire 91 and a second adapter wire 92, the first adapter wire 91 and the second adapter wire 92 are both connected to the electrical connector 62, the second end portions 72 of the plurality of connecting harnesses 70 are connected to the electrical connector 62 through the corresponding first adapter wires 91, and the end of the second adapter wire 92 away from the electrical connector 62 is connected to the battery monitoring unit 61.

[0261] It should be noted that Figure 14The connection between the electrical connector 62, the battery monitoring unit 61, and the connecting wire harness 70 via the first adapter cable 91 and the second adapter cable 92 is shown in a modular format. The positions and shapes of the components in the figure are not intended to indicate their actual positions or configurations. For example, the connecting wire harness 70, the first adapter cable 91, and the second adapter cable 92 are all flexible components. During actual assembly, they are often placed on the surface or in the gaps of structures such as the battery cells 30, the battery monitoring unit 61, or the housing 10 to provide structural support and secure their position.

[0262] Specifically, there are multiple first adapter cables 91, each corresponding to a connection harness 70. The first ends 71 ​​of the multiple connection harnesses 70 are welded or bonded to the conductive portions 33 of the multiple battery cells 30, respectively. The second ends 72 of the multiple connection harnesses 70 are connected to the electrical connector 62 via the corresponding first adapter cables 91, thereby electrically connecting the multiple battery cells 30 to the electrical connector 62. The electrical connector 62 is connected to the battery monitoring unit 61 via a second adapter cable 92. The second adapter cable 92 aggregates information transmitted by all second adapter cables 92 connected to the electrical connector 62, thereby electrically connecting the multiple battery cells 30 to the battery monitoring unit 61.

[0263] In the above technical solution, the second end portions 72 of the plurality of connecting harnesses 70 are connected to the electrical connector 62 through the corresponding first adapter wires 91, and the end of the second adapter wire 92 away from the electrical connector 62 is connected to the battery monitoring unit 61, so that the plurality of connecting harnesses 70 are aggregated and then connected to the battery monitoring unit 61, thereby simplifying the electrical connection lines between the connecting harnesses 70 and the battery monitoring unit 61, saving installation space while also facilitating identification, assembly and maintenance.

[0264] Reference Figure 14 According to some embodiments of the present application, optionally, the end of the second adapter cable 92 away from the electrical connector 62 is connected to the output port 921 , the battery monitoring unit 61 is provided with a connector 611 , and the output port 921 is plugged into the connector 611 .

[0265] Specifically, the output port 921 can be a plug, and the output port 921 forms a connecting terminal protruding from the end face of the output port 921; the connector 611 can be a socket, and the connector 611 is provided with a connecting terminal recessed relative to the surface of the connector 611, and the connecting terminal of the output port 921 is inserted into the connector 611 and maintains contact with the connecting terminal of the connector 611, thereby realizing the electrical connection between the second adapter cable 92 and the battery monitoring unit 61.

[0266] For another example, the output port 921 is plugged into the connector 611 , and the connector 611 may be partially inserted into the output port 921 .

[0267] In the above technical solution, the end of the second adapter line 92 away from the electrical connector 62 is connected to the output port 921, and the battery monitoring unit 61 is provided with a connector 611. The output port 921 is plugged into the connector 611, so that the circuit connection or disconnection between the battery monitoring unit 61 and the second adapter line 92 can be achieved by plugging and unplugging the output port 921 or the connector 611. The operation is convenient and is conducive to improving the assembly efficiency of the battery device.

[0268] According to some embodiments of the present application, optionally, the connection harness 70 is at least one of a flexible circuit board and a harness.

[0269] For example, there are multiple connecting harnesses 70, and the multiple connecting harnesses 70 are flexible circuit boards. The connecting harness 70 may include a first end 71 and a second end 72 extending outward from the flexible circuit board. The first end 71 is connected to the conductive portion 33, and the second end 72 is connected to the battery monitoring unit 61. Furthermore, the connecting harness 70 may be a flexible flat cable (FFC).

[0270] For example, there are multiple connection harnesses 70 , and the multiple connection harnesses 70 are all harnesses.

[0271] For another example, there are multiple connecting harnesses 70 , and the multiple connecting harnesses 70 may include several flexible circuit boards and several harnesses.

[0272] The lengths of the plurality of connecting harnesses 70 extending along the second direction are uneven. Some connecting harnesses 70 are connected to the conductive portions 33 of the battery cells 30 that are farther from the battery monitoring unit 61 and are longer, while some connecting harnesses 70 are connected to the conductive portions 33 of the battery cells 30 that are closer to the battery monitoring unit 61 and are shorter.

[0273] In the above technical solution, the connecting harness 70 is at least one of a flexible circuit board and a harness. The connecting harness 70 has good flexibility, so that the connecting harness 70 is arranged in an irregular structural space between the ends of multiple shells 31 and the battery monitoring unit 61, has good adaptability, and is conducive to saving installation space for the connecting harness 70.

[0274] Reference Figure 12 According to some embodiments of the present application, all battery cells 30 are optionally connected in series, and the battery monitoring unit 61 collects parameters of the battery cells 30 via a sampling portion connected to the conductive portion 33. The sampling assembly 80 includes the battery monitoring unit 61 and multiple sampling portions, and the multiple sampling portions are connected to the battery monitoring unit 61.

[0275] Specifically, the battery cell 30 includes two conductive portions 33, which are disposed at two ends of the housing 31 along the second direction. The two conductive portions 33 are respectively a positive conductive portion 33 and a negative conductive portion 33. The multiple battery cells 30 in the battery cell group 20 are arranged along the first direction. The positive conductive portion 33 (or negative conductive portion 33) of the preceding battery cell 30 along the first direction is electrically connected to the negative conductive portion 33 (or positive conductive portion 33) of the succeeding battery cell 30, so that the multiple battery cells 30 in the battery cell group 20 are sequentially connected in series.

[0276] The battery device 100 may include multiple cell groups 20. The multiple cell groups 20 may be arranged along the second direction and all connected in series, and the multiple cells 30 in each cell group 20 are connected in series. For example, the first two or last two cells 30 in the first direction of two adjacent cell groups 20 along the second direction may be connected in series.

[0277] In the above technical solution, by connecting all the battery cells 30 in series, the battery device 100 can have a higher output voltage, and all the battery cells 30 are connected in series to form a unidirectional series path of multiple battery cells 30, thereby facilitating the sampling unit to collect the parameters of the soft-pack battery cells, and also helping to simplify the battery management system's algorithm for processing the collected battery cell 30 parameters.

[0278] Reference Figure 12 According to some embodiments of the present application, optionally, on a series path of a plurality of battery cells 30 , the number of battery cells 30 between at least two adjacent sampling portions is greater than or equal to two.

[0279] Specifically, all of the battery cells 30 in the battery device 100 can be arranged in series, forming a unidirectional series path for the multiple battery cells 30. Several sampling portions are provided along the series path for the multiple battery cells 30. The sampling portions can be connected to the conductive portion 33 and collect parameters such as voltage and current at corresponding positions of the conductive portion 33 in the series path for the multiple battery cells 30. For example, along the current direction of the series path for the multiple battery cells 30, the number of battery cells 30 between two adjacent sampling portions can be one, two, three, four, six, or more. The number of battery cells 30 between each pair of adjacent sampling portions can be unequal, with at least one pair of adjacent sampling portions having two or more battery cells 30 between them.

[0280] In the above technical solution, two adjacent sampling parts on the series path of multiple battery cells 30 can collect parameters of the battery cells 30 between the two sampling parts. There are at least two adjacent sampling parts in the battery device 100 that can collect parameters of two or more battery cells 30, so that the number of sampling parts can be reduced accordingly, so that the wiring harness connected to the sampling parts can also be shortened and streamlined, thereby saving installation space and reducing costs to a certain extent.

[0281] Reference Figure 12 According to some embodiments of the present application, optionally, on the series path of multiple battery cells 30 , both the two conductive parts 33 of the first battery cell 30 and the last battery cell 30 are connected to the sampling part.

[0282] Specifically, each battery cell 30 includes a positive conductive portion 33 and a negative conductive portion 33. The positive conductive portion 33 and the negative conductive portion 33 can be respectively disposed at the ends of the battery cell 30 along the second direction. In the series path of the multiple battery cells 30, the positive conductive portion 33 of the previous battery cell 30 is connected to the negative conductive portion 33 of the next battery cell 30, or the negative conductive portion 33 of the previous battery cell 30 is connected to the positive conductive portion 33 of the next battery cell 30, so that all the battery cells 30 are sequentially connected in series.

[0283] There are multiple sampling portions, wherein the first sampling portion is connected to the conductive portion 33 of the first battery cell 30 that is not connected to the next battery cell 30 along the series path of the multiple battery cells 30, and the last sampling portion is connected to the conductive portion 33 of the last battery cell 30 that is not connected to the previous battery cell 30 along the series path of the multiple battery cells 30. In other words, the first sampling portion and the last sampling portion are respectively provided at the starting point and the end point of the series path of the multiple battery cells 30.

[0284] In the above technical solution, on the series path of multiple battery cells 30, the conductive parts 33 of the first battery cell 30 and the last battery cell 30 are both connected to the sampling part, thereby ensuring that the sampling part can collect the parameters of the first battery cell 30 and the last battery cell 30, ensuring the comprehensiveness of the sampling, and thus helping to improve the reliability of the management strategy of the battery management system.

[0285] Reference Figure 12 According to some embodiments of the present application, optionally, on the series path of the plurality of battery cells 30 , between the first battery cell 30 and the last battery cell 30 , there are two battery cells 30 between two adjacent sampling portions.

[0286] Specifically, along the series path of multiple battery cells 30, between the first and last battery cells 30, there are two battery cells 30 between every two adjacent sampling units. Each pair of adjacent sampling units can collect parameters of the two battery cells 30 between them. The sampling units can transmit the battery cell 30 parameters to the battery management system via the battery monitoring unit 61. The battery management system can calculate and process the parameters of every two battery cells 30 between the first and last battery cells 30 to obtain estimated parameters for each battery cell 30 between the first and last battery cells 30.

[0287] For example, on a series path of multiple battery cells 30, every two adjacent sampling parts can collect the total voltage of the battery cells 30 between the two adjacent sampling parts. According to the total voltage and the number of battery cells 30 between the two adjacent sampling parts, the average voltage can be obtained; the average voltage is used as the voltage parameter of each battery cell 30.

[0288] Optionally, the specifications of the multiple battery cells 30 in the battery device 100 are the same. In this way, the accuracy of the estimated parameters of each battery cell 30 obtained by the battery management system can be improved.

[0289] In the above technical solution, on the series path of multiple battery cells 30, there are two battery cells 30 between the first battery cell 30 and the last battery cell 30, and between two adjacent sampling parts. Compared with separately setting sampling parts at both ends of each battery cell 30, the number of sampling parts is reduced, and the sampling parts can be connected to the battery monitoring unit 61 with a shorter wiring harness, thereby saving installation space and reducing costs to a certain extent.

[0290] Optionally, the number of battery cells 30 between every two adjacent sampling parts is unequal, wherein the number of battery cells 30 between some groups of two adjacent sampling parts is one, and the number of battery cells 30 between other groups of two adjacent sampling parts is greater than or equal to two.

[0291] For example, the first sampling part and the second sampling part on the series path of the plurality of battery cells 30 are respectively connected to the two conductive parts 33 of the first battery cell 30 , and the last two sampling parts are respectively connected to the two conductive parts 33 of the last battery cell 30 .

[0292] In the above technical solution, the number of battery cells 30 between two adjacent sampling parts in several groups is one, and the number of battery cells 30 between two adjacent sampling parts in other groups is greater than or equal to two, thereby shortening the wiring harness, streamlining the number of sampling parts, and improving the sampling accuracy.

[0293] Reference Figure 13 According to some embodiments of the present application, optionally, the number of battery cell groups 20 is at least two, and the two conductive parts 33 of each battery cell 30 in one battery cell group 20 are provided with a sampling part.

[0294] For example, two cell groups 20 are arranged along the second direction, and every two adjacent cell groups 30 along the second direction are connected in series, wherein all cell groups 30 in one cell group 20 are sequentially connected in series through the cell groups 30 in the other cell group 20 .

[0295] For example, the two conductive parts 33 of each battery cell 30 in one of the two battery cell groups 20 are provided with a sampling part, and the two conductive parts 33 of every two battery cells 30 in the other of the two battery cell groups 20 are provided with a sampling part on the series path of multiple battery cells 30.

[0296] In the above technical solution, the number of battery cell groups 20 is at least two, which can increase the overall output voltage of the battery device. The two conductive parts 33 of each battery cell 30 in one battery cell group 20 are provided with a sampling part, and each battery cell 30 in the battery cell group 20 can be sampled separately, thereby improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy according to the sampling parameters.

[0297] According to some embodiments of the present application, optionally, the conductive portions 33 of two adjacent battery cells 30 arranged along the second direction are connected and provided with a sampling portion.

[0298] In the above technical solution, the conductive parts 33 of two adjacent battery cells 30 arranged along the second direction are connected, which can eliminate or reduce the electrical connection devices between the battery cells 30, reduce the number of components of the battery cell group 20, thereby saving the space occupied by the electrical connection devices, and is conducive to improving the energy density of the battery cell group 20; the connected conductive parts 33 of two adjacent battery cells 30 arranged along the second direction are provided with a sampling part, which can collect parameters of the two adjacent battery cells 30 along the second direction, improve the sampling accuracy, enrich the diversity of sampling methods, and thereby improve the decision reliability of the battery management system.

[0299] Reference Figure 7 and Figure 12 According to some embodiments of the present application, optionally, at least one conductive portion 33 of each battery cell 30 is electrically connected to the battery monitoring unit 61 through a connecting harness 70, and the connecting harness 70 includes a first end 71 and a second end 72 opposite to each other, and the first end 71 forms a sampling portion.

[0300] Specifically, each battery cell 30 is provided with a conductive portion 33 at both ends along the second direction. The battery monitoring unit 61 is located on one side of the battery cell group 20 along the second direction. The connecting wire harness 70 can extend along the second direction, with the second end 72 and the first end 71 being opposite ends of the connecting wire harness 70 along the second direction. The first end 71 is welded or bonded to the conductive portion 33 of the battery cell 30 to form a sampling portion. There are multiple connecting wire harnesses 70, which are less than or equal to the number of conductive portions 33 and greater than or equal to the number of battery cells 30.

[0301] In the above technical solution, at least one conductive part 33 of each battery cell 30 is electrically connected to the battery monitoring unit 61 through a connecting harness 70, and the second end 72 of the connecting harness 70 forms a sampling part and is connected to the conductive part 33, so that the battery monitoring unit 61 can obtain the parameters of each battery cell 30 through the sampling part and the connecting harness 70, thereby improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy.

[0302] Reference Figure 15-17 According to some embodiments of the present application, the housing 31 is optionally made of a soft outer packaging material. In the first direction, a reinforcing partition 40 is sandwiched between at least two adjacent battery cells 30. The reinforcing partition 40 is connected to the housing 31 and has a hardness greater than that of the housing 31. In this embodiment, the battery cells 30 are soft-pack battery cells.

[0303] For example, the reinforcing partition 40 may be a metal plate, and the flexible shell may be an aluminum-plastic film.

[0304] The reinforcing partition 40 is sandwiched between two adjacent battery cells 30, including the following situations: reinforcing partitions 40 are provided between some adjacent battery cells 30, and reinforcing partitions 40 are not provided between other adjacent battery cells 30; or, reinforcing partitions 40 are provided between every two adjacent battery cells 30.

[0305] The reinforcing partition 40 and the flexible shell of the battery cell 30 can be bonded and fixed.

[0306] In the above technical solution, by arranging a reinforcing partition 40 between adjacent battery cells 30 and making the hardness of the reinforcing partition 40 greater than the hardness of the flexible shell, it is convenient to group multiple battery cells 30, and the overall stiffness of the battery cell group 20 formed by grouping multiple battery cells 30 can be improved, thereby facilitating the installation of the battery cell group 20 formed by grouping multiple battery cells 30 and reducing the deformation of the battery cells 30 after grouping.

[0307] According to some embodiments of the present application, optionally, the thickness of the reinforcing separator 40 is smaller than the thickness of the battery cell 30 .

[0308] The thickness direction of the reinforcing separator 40 is consistent with the thickness direction of the battery cell 30. The battery cell 30 can be arranged with its thickness direction parallel to the first direction and substantially perpendicular to the third direction.

[0309] For example, refer to Figure 17 The thickness of the reinforcing separator 40 is d2, and the thickness of the battery cell 30 is d3, where d2 is smaller than d3. For example, d2 ranges from 0.8 mm to 2.0 mm; for example, d2 is 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, etc.

[0310] In the above technical solution, by making the thickness of the reinforcing partition 40 smaller than the thickness of the battery cell 30, while improving the overall stiffness of the group of multiple battery cells 30, the space occupied by the reinforcing partition 40 can be reduced, especially the space occupied by the reinforcing partition 40 in the thickness direction of the battery cell 30 can be reduced, so that the overall energy density of the battery device 100 is higher.

[0311] According to some embodiments of the present application, optionally, the reinforcing partition 40 is a metal plate.

[0312] In some embodiments, the reinforcing spacer 40 is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0313] In the above technical solution, by setting the reinforcing partition 40 to a material such as an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate, the reinforcing partition 40 can have higher strength and hardness, thereby better improving the overall stiffness of the multiple battery cells 30 in a group and better reducing the deformation of the grouped battery cells 30.

[0314] According to some embodiments of the present application, optionally, the reinforcing partition 40 is a heat conductive member and is thermally connected to the housing 31 .

[0315] For example, the reinforcing plate 40 and the housing 31 can be thermally connected by a thermally conductive adhesive. Since the reinforcing plate 40 is a heat conductor, the reinforcing plate 40 can transfer heat to the battery cell 30 or absorb heat generated by the battery cell 30, thereby regulating the temperature of the battery cell 30.

[0316] In the above technical solution, by setting the reinforcing partition 40 as a heat conductor and thermally connecting it to the shell 31, the reinforcing partition 40 can enhance the overall stiffness of the battery cells 30 after being grouped, and at the same time, the reinforcing partition 40 can have a thermal management function. Through the heat exchange between the reinforcing partition 40 and the battery cells 30, the temperature of the battery cells 30 can be adjusted so that the battery cells 30 operate within a suitable temperature range.

[0317] According to some embodiments of the present application, optionally, the reinforcement partition 40 is a solid structure.

[0318] For example, the reinforcing spacer 40 may be a solid aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0319] In the above technical solution, by setting the reinforcing partition 40 as a solid structure, the reinforcing partition 40 can have better structural strength and rigidity, and play an effective reinforcing role when the thickness of the reinforcing partition 40 is small, which is beneficial for the battery cell group 20 as a whole to have better strength and rigidity while also having a higher volume energy density.

[0320] According to some embodiments of the present application, optionally, a cavity 42 is formed in the reinforcement partition 40 .

[0321] For example, refer to Figure 17 The cavities 42 formed in the reinforcing partition 40 can be multiple and spaced apart. The multiple cavities 42 in the reinforcing partition 40 can be spaced apart along the width direction of the battery cell 30 , and each cavity 42 can extend along the length direction of the battery cell 30 .

[0322] In the above technical solution, by setting a cavity 42 in the reinforcing partition 40, while the reinforcing partition 40 plays a role in enhancing the overall stiffness of the battery cells 30 after being grouped, the cavity 42 in the reinforcing partition 40 can absorb the expansion and deformation of the battery cells 30. The cavity 42 in the reinforcing partition 40 can provide a buffer for the deformation of the adjacent battery cells 30 and is conducive to reducing the weight of the reinforcing partition 40.

[0323] Reference Figure 17 According to some embodiments of the present application, optionally, the cavity 42 includes a heat exchange channel 43 for the flow of heat exchange medium.

[0324] When at least a portion of the cavity 42 of the reinforcing partition 40 is used as the heat exchange flow channel 43 , the reinforcing partition 40 may serve as at least a portion of a heat management component.

[0325] For example, the reinforcing partition 40 can be connected to the battery cell 30 through thermal conductive glue, so that heat exchange between the reinforcing partition 40 and the battery cell 30 can be easily achieved. When the heat exchange medium flows through the heat exchange channel 43, the temperature of the battery cell 30 can be adjusted, for example, the temperature of the battery cell 30 can be increased or decreased.

[0326] In the above technical solution, at least part of the cavity 42 in the reinforced partition 40 constitutes a heat exchange channel 43. By flowing the heat exchange medium through the heat exchange channel 43 in the reinforced partition 40, the heat exchange medium can exchange heat with the battery cell 30, thereby effectively regulating the temperature of the battery cell 30.

[0327] Reference Figure 11 and Figure 17 According to some embodiments of the present application, optionally, the reinforcing partition 40 includes a connecting portion 41 protruding from the shell 31 along the second direction, and the connecting portion 41 is located on a side of the conductive portion 33 away from the battery monitoring unit 61.

[0328] When the cavity 42 is formed in the reinforcing partition 40 , the cavity 42 may not extend to the connecting portion 41 , that is, the connecting portion 41 may be a solid structure.

[0329] In the above technical solution, by making the end of the reinforcing partition 40 along the second direction protrude from the shell 31 of the battery cell 30 and connected to the box body 10, since the reinforcing partition 40 is sandwiched between multiple battery cells 30 and grouped with multiple battery cells 30 to form a battery cell group 20, and the overall hardness of the reinforcing partition 40 is greater than the shell 31 of the battery cell 30, the battery cell group 20 as a whole has better strength and rigidity.

[0330] In some embodiments, the connection portion 41 can be connected to the box body 10. In this way, the connection portion 41 is connected to the box body 10, so that the battery cell group 20 is connected and fixed to the side wall of the box body 10. The connection portion 41 is a solid structure, which can make the connection between the battery cell group 20 and the box body 10 more reliable, thereby improving the installation reliability and stability of the battery cell group 20 in the box body 10.

[0331] Reference Figure 18 According to some embodiments of the present application, optionally, in the first direction, two adjacent reinforcing partitions 40 are connected by a connecting plate 44 , and the battery cell 30 is accommodated in a space enclosed by the connecting plate 44 and the two reinforcing partitions 40 .

[0332] Specifically, the connecting plate 44 connects the ends of the two reinforcing separators 40 on the same side in the second direction. The connecting plate 44 can be a straight plate or a slightly curved plate, and the connecting plate 44 is generally parallel to the first direction. The connecting plate 44 and the two reinforcing separators 40 it connects form a frame shaped like the letter "U" and is positioned around the battery cell 30 between the two reinforcing separators 40.

[0333] In the above technical solution, two adjacent reinforcing partitions 40 are connected by a connecting plate 44, and the battery cell 30 is accommodated in the space surrounded by the connecting plate 44 and the two reinforcing partitions 40, thereby improving the strength of the reinforcing partition 40 and further increasing the installation reliability and stability of the battery cell 30.

[0334] Reference Figure 18 According to some embodiments of the present application, optionally, two adjacent reinforcing partitions 40 in the first direction and the connected connecting plate 44 are formed into an integral structure.

[0335] As an example, every two adjacent heating baffles in the first direction are fixedly connected to the connecting plate 44 between the two reinforcing baffles 40 and can be integrally formed.

[0336] In the above technical solution, the two adjacent reinforcing partitions 40 in the first direction and the connecting plate 44 connected between the two reinforcing partitions 40 are formed into an integrated structure, thereby further improving the strength of the reinforcing partitions 40 and increasing the installation reliability and structural stability of the battery cell 30.

[0337] Reference Figures 19-21According to some embodiments of the present application, optionally, the conductive portions 33 of two adjacent battery cells 30 are directly connected.

[0338] It should be noted that the conductive parts 33 of two adjacent battery cells 30 are directly connected, and the portion of the conductive part 33 exposed outside the shell 31 is defined as the lead-out part 331. The conductive parts 33 of two adjacent battery cells 30 are directly connected, which actually means that the lead-out parts 331 of the two conductive parts 33 are directly connected.

[0339] The “direct connection” in the direct connection of the conductive portions 33 of two adjacent battery cells 30 means that the conductive portions 33 of the two battery cells 30 are directly connected without the need for an electrical connection device to achieve electrical connection between the two adjacent battery cells 30 .

[0340] The electrical connection between two adjacent battery cells 30 may be a series connection.

[0341] In the above technical solution, by directly connecting the conductive parts 33 of two adjacent battery cells 30 in the battery cell group 20, the electrical connection devices between the battery cells 30 can be omitted or reduced, the number of components of the battery cell group 20 can be reduced, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the battery cell group 20, and since the electrical connection devices between the battery cells 30 are omitted or reduced, the cost can also be reduced.

[0342] According to some embodiments of the present application, optionally, the conductive portions 33 of two adjacent battery cells 30 are connected by welding.

[0343] For example, the conductive portions 33 of two adjacent battery cells 30 may be welded together by laser welding or ultrasonic welding.

[0344] In the above technical solution, the conductive portions 33 of two adjacent battery cells 30 in the battery cell group 20 are connected by welding, thereby achieving direct connection of the terminals of two adjacent battery cells 30 in the battery cell group 20, so that the connection method of the conductive portions 33 of two adjacent battery cells 30 in the battery cell group 20 is simple and reliable.

[0345] According to some embodiments of the present application, optionally, the conductive parts 33 of two adjacent battery cells 30 are directly connected by conductive glue.

[0346] In some embodiments, the conductive portions 33 of two adjacent battery cells 30 are directly connected via conductive adhesive.

[0347] For example, conductive glue can be coated on a conductive part 33 of one of the two adjacent battery cells 30, and the conductive part 33 of the other of the two adjacent battery cells 30 can be connected to the conductive part 33 coated with conductive glue; or, conductive glue can be coated on the conductive parts 33 of both of the two adjacent battery cells 30, and the two conductive parts 33 coated with conductive glue can be connected through the conductive glue.

[0348] In the above technical solution, the conductive parts 33 of two adjacent battery cells 30 in the battery cell group 20 are connected by conductive glue, thereby achieving direct connection of the terminals of two adjacent battery cells 30 in the battery cell group 20, so that the connection method of the conductive parts 33 of two adjacent battery cells 30 in the battery cell group 20 is simple and reliable.

[0349] Reference Figure 22 and Figure 23 According to some embodiments of the present application, optionally, a plurality of battery cells 30 are bonded and matched in sequence along a first direction, and the battery cell 30 has a first surface 311 and a second surface 312 , and the second surface 312 is adjacent to the first surface 311 ;

[0350] The battery device 100 includes a case 10, an adhesive layer 34 and a blocking member 35. The adhesive layer 34 is arranged on one side of the battery cell group 20 located on the first surface 311 and is used to adhere the multiple battery cells 30 to the case 10. The blocking member 35 is located between at least one battery cell 30 at both ends of the battery cell group 20 in the first direction and the adhesive layer 34, and is used to prevent the adhesive layer 34 from overflowing from the first surface 311 of the battery cell 30 to the second surface 312 of the corresponding battery cell 30.

[0351] Specifically, the glue layer 34 may refer to a layered structure formed by glue for bonding.

[0352] The blocking member 35 may be a structure or component used to prevent the glue layer 34 from overflowing from the first surface 311 of the battery cell 30 to the second surface 312 of the corresponding battery cell 30. For example, the blocking member 35 may be L-shaped, partially covering the first surface 311, thereby preventing the glue from overflowing onto the second surface 312. The blocking member 35 may also be a flat plate, partially covering the first surface 311 and with another portion extending beyond the second surface 312. If the glue overflows, the overflowed glue will be located on the other portion of the blocking member 35 without contacting the second surface 312, thereby also preventing the glue from overflowing.

[0353] The first surface 311 and the second surface 312 may refer to the two surfaces of the battery cell 30. The first surface 311 may be, but is not limited to, the bottom, top, or side surface of the battery cell 30, and may be fixed to the housing 10 via the adhesive layer 34. The second surface 312 may refer to a surface adjacent to the first surface 311. There may be one or more second surfaces 312. For example, the second surface 312 may be located at one or both ends of the first direction e1 of the first surface 311, or at one or both ends of the second direction e2 of the first surface 311, or at one or both ends of the first direction e1 and one or both ends of the second direction e2 of the first surface 311. The second direction e2 may refer to the other of the length direction or the width direction of the housing 10. For example, the first direction e1 may refer to the length direction of the housing 10, and the second direction e2 may refer to the width direction of the housing 10.

[0354] In the battery device 100 with the above structure, during the assembly stage, glue is applied between the first surfaces 311 of the multiple battery cells 30 of the battery cell group 20 and the casing 10 to form a glue layer 34. Because the blocking member 35 is located between at least one battery cell 30 at both ends of the battery cell group 20 in the first direction e1 and the glue layer 34, the blocking member 35 can effectively reduce the risk of glue overflowing from the first surface 311 to the second surface 312 during the glue application process. This can effectively reduce the risk of glue overflowing and forming a hard structure on the second surface 312 of the battery cell 30. When the battery cell 30 expands or shifts, the risk of local stress concentration caused by contact between the surface of the battery cell 30 and the hard structure is reduced, which helps reduce the probability of damage to the battery cell 30.

[0355] Secondly, the first surface 311 of the battery cell 30 is separated from the casing 10 by the adhesive layer 34, preventing the battery cell 30 from contacting the casing 10. Thus, the adhesive layer 34 provides insulation. Because the blocking member 35 is located between at least one battery cell 30 at both ends of the battery cell group 20 in the first direction e1 and the adhesive layer 34, the blocking member 35 can increase the distance between the first surface 311 of the battery cell 30 and the casing 10, thereby increasing the insulation gap between the first surface 311 and the casing 10. This also helps increase the thickness of the adhesive layer 34, thereby further enhancing the insulation between the battery cell 30 and the casing 10.

[0356] In the above technical solution, by arranging the blocking member 35 between at least one battery cell 30 and the glue layer 34 at both ends of the battery cell group 20 in the first direction e1, the risk of glue overflowing from the first surface 311 of the battery cell 30 to the second surface 312 during glue application can be reduced during the assembly stage of the battery device 100, and the probability of glue overflow forming a hard structure on the second surface 312 of the battery cell 30 is reduced, thereby improving the problem of local stress concentration on the surface of the battery cell 30, reducing the risk of damage to the battery cell 30, and enhancing the insulation between the first surface 311 of the battery cell 30 and the box body 10, which is beneficial to improving the reliability of the battery cell 30 and the reliability of the battery device 100.

[0357] Reference Figure 24 and Figure 25 According to some embodiments of the present application, optionally, the blocking member 35 at least covers the corner position of the corresponding battery cell 30.

[0358] It is understood that the blocking member 35 may cover the first surfaces 311 of all the battery cells 30 in the battery cell group 20, or may cover only the first surfaces 311 of the battery cells 30 located at both ends of the first direction e1, or may cover only the corners of the first surfaces 311 of the battery cells 30 located at both ends of the first direction e1. In all three cases, the blocking member 35 can at least cover the corners of the corresponding battery cells 30.

[0359] When applying glue to the first surfaces 311 of all the battery cells 30 of the battery cell group 20 , the glue spreads along the first direction e1 and the second direction e2 and accumulates at the four corners of the battery cell group 20 . Therefore, the probability of glue overflowing at the corners of the battery cell group 20 is higher than that at other positions.

[0360] In the above technical solution, the blocking member 35 covers the corner position of the corresponding battery cell 30, which can effectively reduce the probability of glue accumulation at the corner position of the outermost battery cell 30, and play a better role in preventing glue overflow. At the same time, it can also reduce the size of the blocking member 35 and the amount of material used, and can also leave a suitable size of space on the first surface 311 for glue application, thereby improving the bonding strength between the battery cell 30 and the box body 10.

[0361] Reference Figure 25 According to some embodiments of the present application, optionally, the blocking member 35 at least covers the edge position of the corresponding battery cell 30 located in the first direction e1.

[0362] It is understandable that in the above technical solution, the blocking member 35 may cover the first surfaces 311 of all the battery cells 30 in the battery cell group 20, or may cover only the first surfaces 311 of the battery cells 30 located at both ends of the first direction e1, or may cover only the edge positions of the corresponding battery cells 30 located in the first direction e1. In all three cases, the blocking member 35 satisfies the requirement of covering the edge positions of the corresponding battery cells 30 located in the first direction e1.

[0363] Because the multiple battery cells 30 are arranged along the first direction e1, the second surfaces 312 of the battery cells 30 located at the ends of the first direction e1 are generally large surfaces. Using the above-described technical solution, the blocking member 35 not only reduces the risk of glue overflowing onto the second surfaces 312 at the corners of the battery cells 30, but also reduces the risk of glue overflowing onto the large surfaces of the battery cells 30. This reduces the probability of glue overflowing onto the large surfaces of the battery cells 30 and solidifying to form a hard structure, thereby further reducing the risk of damage to the battery cells 30.

[0364] In the above technical solution, the blocking member 35 can reduce the risk of glue overflowing to the second surface 312 of the larger area of ​​the battery cell 30, thereby further reducing the risk of glue overflowing and forming a hard structure at the edge of the battery cell group 20, and further reducing the risk of damage to the battery cell 30, thereby improving the reliability of the battery device 100.

[0365] In some embodiments of the present application, reference is made to Figure 24 The blocking members 35 are provided at both ends of the battery cell group 20 in the first direction e1. In the first direction e1, the size of the battery cell group 20 is L1, and the size of the blocking member 35 is L2, wherein 0.05≤L2 / L1.

[0366] L2 / L1 can be, but is not limited to, 0.05, 0.07, 0.09, 0.10, 0.12, 0.15, 0.17, 0.2, 0.25, 0.3, etc. In other words, the size of the blocking member 35 can be selected to suit the value of the dimension L1 of the battery cell group 20. For example, the dimension L2 of the blocking member 35 in the first direction e1 can be 5 mm, 6 mm, 7 mm, etc.

[0367] It is understood that the minimum ratio L2 / L1 must be greater than or equal to 0.05. If L2 / L1 is less than 0.05, the portion of the barrier 35 corresponding to the first surface 311 is relatively small, and the area covered by the barrier 35 on the first surface 311 is small. The barrier 35 does not have enough solid part to block the glue, increasing the risk of glue overflowing from the barrier 35 to the second surface 312, and failing to effectively prevent glue overflow. Furthermore, the small size of the portion of the barrier 35 corresponding to the first surface 311 increases the risk of sharp objects piercing the first surface 311, and thus fails to provide effective protection.

[0368] In the above technical solution, by setting the size ratio of the blocking member 35 and the battery cell group 20 in the first direction e1 within the above range, the size of the blocking member 35 corresponding to the first surface 311 can be within an appropriate range, which can not only effectively prevent the glue from overflowing from the first surface 311 to the second surface 312, but also play a better protective role, reduce the risk of sharp objects contacting the first surface 311 and damaging the battery cell 30, and improve the reliability of the battery device 100.

[0369] In some embodiments of the present application, the area of ​​the orthographic projection of the blocking member 35 on the plane where the first surface 311 is located is greater than or equal to the area of ​​all the first surfaces 311 .

[0370] In some embodiments of the present application, reference is made to Figure 23 The blocking member 35 includes a first portion 351 and a second portion 352 connected to each other. The first portion 351 covers at least a portion of the first surface 311 , and the second portion 352 is bent relative to the first portion 351 in a direction away from the adhesive layer 34 .

[0371] It is understood that the second portion 352 is arranged at an angle relative to the first portion 351, and the angle between the two can be set as needed. For example, the angle between the second portion 352 and the first portion 351 is an obtuse angle, so that the blocking member 35 can be configured in a V shape; the angle between the second portion 352 and the first portion 351 can also be a right angle, so that the blocking member 35 can be configured in an L shape (see Figure 23 ). Optionally, the first portion 351 and the first surface 311 may be connected by methods including but not limited to hot melting or bonding.

[0372] In the above technical solution, the first portion 351 serves to widen the gap between the first surface 311 and the housing 10, thereby enhancing the insulation between the battery cell assembly 20 and the housing 10. Since the second portion 352 is bent relative to the first portion 351, it effectively blocks the glue from spreading to the second surface 312 adjacent to the first surface 311. The barrier 35 employing the above structure is relatively simple and easy to manufacture, thereby reducing costs.

[0373] In some embodiments of the present application, reference is made to Figure 22 and Figure 23 The battery cell group 20 includes a reinforcing partition 40 and a connecting plate 44 . The plurality of battery cells 30 are arranged between two adjacent reinforcing partitions 40 along the first direction. The reinforcing partition 40 and the connecting plate 44 are formed with an opening open toward the first surface 311 .

[0374] By strengthening the partition 40, a relatively strong external protective structure can be provided for multiple battery cells 30, reducing the risk of damage to the battery cells 30 due to external mechanical impact. It can also ensure that the battery cells 30 are in the correct position in the box 10, reducing the risk of poor contact due to movement of the battery cells 30.

[0375] In some embodiments of the present application, the blocking member 35 is made of an insulating material.

[0376] The insulating material may include but is not limited to ceramic material, glass material, plastic material, rubber material or mica material, etc., wherein the plastic material may include but is not limited to polypropylene, polyetherimide, etc.

[0377] The blocking member 35 can enhance the insulation between the battery cell group 20 and the box body 10 by increasing the gap between the first surface 311 and the box body 10. On this basis, by setting the blocking member 35 to an insulating material, the blocking member 35 itself can have an insulating effect, further enhancing the insulation between the battery cell 30 and the box body 10, reducing the risk of short circuit, etc., and thereby improving the reliability of the battery cell group 20.

[0378] In the above technical solution, by making the blocking member 35 of an insulating material, it helps to further enhance the insulation between the first surface 311 of the battery cell 30 and the box 10, thereby improving the insulation between the battery cell group 20 and the box 10, thereby improving the reliability of the battery device 100.

[0379] In some embodiments of the present application, reference is made to Figure 23 The wall thickness of the blocking member 35 is H, where 1mm≤H≤3mm.

[0380] H can be, but is not limited to, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, etc. It is understood that if H is less than 1 mm, the thickness of the barrier 35 is too small, and it cannot provide good protection and insulation. For example, if the barrier 35 is too thin, there is an increased risk of machining burrs on the case 10 or external sharp objects piercing the barrier 35 and thus the battery cell 30. Furthermore, the effect of increasing the gap between the first surface 311 and the case 10 is relatively poor, and it cannot provide good insulation. If the barrier 35 is made of an insulating material, the barrier 35 itself cannot provide good insulation due to its small thickness.

[0381] Considering that the processing burrs of the box body 10 are generally less than 3 mm, if H is greater than 3 mm, the thickness of the blocking member 35 is relatively large, resulting in excessive protection performance, and the increased gap between the first surface 311 and the box body 10 is also relatively large, which far exceeds the insulation requirements. When the blocking member 35 is made of an insulating material, its own insulation performance will also far exceed expectations. In other words, if H is greater than 3 mm, the protection performance and insulation performance of the blocking member 35 will be excessive, and it will occupy a large space, which is not conducive to the compact design of the battery device 100, nor is it conducive to improving the energy density of the battery device 100.

[0382] It should be noted that the wall thickness of the barrier 35 can vary depending on the material of the barrier 35. For example, when the barrier 35 is made of polyetherimide (PEI), while preventing glue overflow, it also provides insulation. In this case, the wall thickness of the barrier 35 can be 2 mm, and the portion corresponding to the first surface 311 in the first direction e1 can be 7 mm. When the barrier 35 is made of aluminum, it can be designed in an L-shape with an insulating layer on its surface. In this case, the thickness of the barrier 35 can be 1 mm, and the portion corresponding to the first surface 311 in the first direction e1 can be 5 mm. When the barrier 35 is made of polypropylene (PP), it can also be designed in an L-shape, with a thickness of 1.5 mm and a portion corresponding to the first surface 311 in the first direction e1 of 6 mm.

[0383] In the above technical solution, by setting the wall thickness of the blocking member 35 within the above range, the thickness of the blocking member 35 can be reduced as much as possible while meeting the protection and insulation properties, thereby saving the space occupied by the blocking member 35 and reducing the weight of the blocking member 35, which is beneficial to the compact design of the battery device 100, and can reduce the overall weight of the battery device 100, and can improve the energy density of the battery device 100.

[0384] In some embodiments of the present application, the energy density of the battery cell 30 is E, and the melting point of the barrier 35 is T1, wherein: when E≤390Wh / L, T1>150°C; when E>390Wh / L, T1>200°C.

[0385] When the energy density E of the battery cell 30 is greater than or equal to 390Wh / L, the temperature of the battery cell 30 during thermal runaway exceeds 200°C. Therefore, the barrier 35 can be made of a material with a melting point greater than 200°C. This reduces the risk of melting and performance impairment of the barrier 35 during thermal runaway, thereby improving the high-temperature resistance of the barrier 35. When the energy density E of the battery cell 30 is less than 390Wh / L, the temperature of the battery cell 30 during thermal runaway is less than 150°C. Therefore, the barrier 35 can be made of a material with a melting point greater than 150°C. This ensures the barrier 35's high-temperature resistance while also reducing costs.

[0386] For example, when the blocking member 35 is made of polypropylene (PP), the melting point is greater than or equal to 150°C; when the blocking member 35 is made of polyetherimide (PEI), the melting point is greater than or equal to 250°C; when the blocking member 35 is made of polyimide (PI), the melting point is greater than or equal to 300°C; when the blocking member 35 is made of aluminum with an insulating layer, the melting point is greater than or equal to 660°C; when the blocking member 35 is made of steel with an insulating layer, the melting point is greater than or equal to 1000°C.

[0387] In the above technical solution, by setting the melting point of the blocking member 35 and the energy density of the battery cell 30 within the above range, the blocking member 35 can have appropriate high temperature resistance, thereby improving the reliability of the blocking member 35, thereby improving the reliability of the battery device 100, and also taking into account the cost of the blocking member 35, which is beneficial to reducing the cost of the battery device 100.

[0388] In some embodiments of the present application, reference is made to Figure 22 The box body 10 includes a plurality of box walls 111 , which together define an accommodating space 10 a . The first surface 311 and the blocking member 35 are bonded to the box walls 111 via an adhesive layer 34 .

[0389] The box walls 111 may refer to the wall panels that enclose the box body 10. The multiple box walls 111 may include a top cover 11, a bottom plate 12, side walls, etc. In the above technical solution, the first surface 311 of the battery cell 30 may be bonded and fixed to one of the bottom plate 12, the top cover 11, or the side wall via the adhesive layer 34.

[0390] In the above technical solution, the first surface 311 of the battery cell 30 and the blocking member 35 can be bonded and fixed to the box wall 111 of the box body 10 through the adhesive layer 34, thereby making the connection between the battery cell 30 and the box body 10 more secure.

[0391] In some embodiments of the present application, reference is made to Figure 23 The box body 10 includes a box body 101 and a heat exchange plate 102. The heat exchange plate 102 is connected to the box body 101 and defines a receiving space 10a together with the box body 101. The first surface 311 and the blocking member 35 are bonded to the heat exchange plate 102 through the adhesive layer 34.

[0392] The heat exchange plate 102 may refer to a component that can exchange heat with the battery cell 30 to adjust the temperature of the battery cell 30. For example, the heat exchange plate 102 may be a cold plate. In this technical solution, the heat exchange plate 102 and the box body 101 may together form the box body 10. The heat exchange plate 102 may serve as a box wall 111 of the box body 10. For example, the box body 101 does not have a bottom wall, and the heat exchange plate 102 is connected to the bottom of the box body 101, serving as the bottom wall of the entire box body 10; the heat exchange plate 102 may also be provided on any wall panel of the box body 101, and together with the corresponding wall panel, form a box wall 111 of the box body 10.

[0393] In the above technical solution, by bonding the first surface 311 of the battery cell 30 and the blocking member 35 to the heat exchange plate 102 through the adhesive layer 34, the heat exchange plate 102 can efficiently exchange heat with the battery cell 30 and quickly adjust the temperature of the battery cell 30, which is beneficial to improving the reliability of the battery cell 30 and further improving the reliability of the battery device 100.

[0394] Optionally, the heat exchange plate 102 is provided at the bottom of the box body 101 .

[0395] According to some embodiments of the present application, optionally, the battery cell 30 is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

[0396] The solid-state battery cell may be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, etc. The solid-state battery cell may also be a semi-solid-state battery cell or a fully solid-state battery cell.

[0397] In the above technical solution, the use of the above-mentioned types of battery cells 30 provides more options for battery device design to meet different usage requirements. Among them, battery cell 30 is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity, and low internal resistance; battery cell 30 is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; battery cell 30 is a solid-state battery cell, which has the advantages of high energy density, high reliability, light weight, and good high and low temperature performance.

[0398] According to some embodiments of the present application, optionally, the battery cell 30 is a lithium iron phosphate battery cell, and in the positive electrode material of the battery cell 30, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (1-3): (1-3); the battery cell 30 is a ternary battery cell, and in the positive electrode material of the battery cell 30, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (2-3): (1-2).

[0399] In some embodiments, the positive electrode of the battery cell 30 may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer includes a positive electrode active material.

[0400] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive electrode current collector.

[0401] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, the metal foil may include stainless steel, copper, aluminum, nickel, carbon electrodes, aluminum or stainless steel treated with carbon, nickel, titanium, or silver. A composite current collector may include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) onto a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0402] As an example, when the battery cell 30 of an embodiment of the present application is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide, and their respective modified compounds. Optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which may help improve the energy density of the battery cell 30. However, the present application is not limited to these materials; other conventional materials that can be used as battery positive electrode film layers may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0403] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0404] Layered transition metal oxides include those of the general formula Li a Ni b Co c M d O e A f At least one compound and its modified compound. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, and B, and A includes at least one of N, F, S, and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0405] Examples of layered transition metal oxides include, but are not limited to, lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM811), LiNi 0.9 Co 0.05 Mn 0.05 O2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0406] When the battery cell 30 of the embodiment of the present application is a sodium ion battery, the positive electrode active material may include but is not limited to at least one of sodium-containing transition metal oxides, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0407] As an example, the positive active material for sodium ion batteries may include NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, NaNi1 / 2Ti1 / 2O2, NaNi1 / 2Mn1 / 2O2, Na2 / 3Fe1 / 3Mn2 / 3O2, NaNi1 / 3Co1 / 3Mn1 / 3O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue materials, materials of the general formula X p M' q (PO4) r O x Y 3-x At least one of the materials. p M' q (PO4) r O xY 3-x , 0<p≤4, 0<q≤2, 1≤r≤3, 0≤x≤2, X includes H + 、Li + 、Na + , K + and NH4 + At least one of , M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halogen anion, optionally at least one of F, Cl and Br.

[0408] In the embodiment of the present application, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0409] During the charge and discharge process, the battery cell 30 is accompanied by the deintercalation and consumption of active ions such as Li. The molar content of Li in the battery cell 30 varies when discharged to different states. The molar content of Li in the examples of the present application regarding the positive electrode active materials is the initial state of the material, i.e., the state before the material is added. When the positive electrode active material is used in a battery system, the molar content of Li may change after charge and discharge cycles.

[0410] In the examples of the present application regarding the positive electrode active materials, the molar content of oxygen O is only a theoretical value. Lattice oxygen release will cause the molar content of oxygen O to change. In practice, the molar content of oxygen O will fluctuate.

[0411] In the examples of this application, the element contents in the positive electrode active material have meanings well known in the art and can be measured using equipment and methods known in the art. For example, in accordance with EPA 6010D-2014, the content can be measured by inductively coupled plasma atomic emission spectrometry (ICP-OES, Thermo ICAP7400). First, 0.4 g of the positive electrode active material was weighed and 10 ml of 50% aqua regia was added. The mixture was then placed on a plate at 180°C for 30 minutes. After digestion on the plate, the volume was adjusted to 100 ml, and quantitative analysis was performed using a standard curve method.

[0412] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, a positive electrode film layer may or may not be provided on the surface of the metal foam. As an example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0413] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The present invention does not particularly limit the type of the positive electrode conductive agent. For example, the positive electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5 wt%.

[0414] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The present embodiments do not particularly limit the type of positive electrode binder. For example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, and a fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5 wt%.

[0415] The positive electrode film layer is typically formed by coating a positive electrode slurry onto a positive electrode current collector, drying it, and cold pressing it. The positive electrode slurry is typically formed by dispersing the positive electrode active material, an optional conductive agent, an optional binder, and any other components in a solvent and stirring them uniformly. The solvent can be, but is not limited to, N-methylpyrrolidone (NMP).

[0416] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0417] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0418] As examples, the negative electrode current collector can be a metal foil, metal foam, or composite current collector. For example, the metal foil can include silver-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) onto a polymer substrate (such as a substrate made of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0419] As an example, the negative electrode active material may adopt the negative electrode active material for the battery cell 30 that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: a carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material may include at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other traditional materials that can be used as battery negative electrode film layers may also be used. These negative electrode film layers may be used alone or in combination of two or more.

[0420] In some embodiments, the negative electrode active material includes silicon. The silicon may be present in the form of a silicon-based material. For example, the silicon-based material may include at least one of elemental silicon, a silicon-oxygen compound, a silicon-carbon complex, a silicon-nitrogen complex, and a silicon alloy. The introduction of silicon can increase the energy density of the battery cell 30.

[0421] In some embodiments, the mass content of silicon in the negative electrode film layer is 1 wt% to 32 wt%, optionally 2 wt% to 19 wt%, and further optionally 6 wt% to 13 wt%. In the battery cell 30 system, when the mass content of silicon is within the above range, the energy density of the battery cell 30 can be improved.

[0422] In the embodiments of the present application, the mass content of silicon in the negative electrode film layer has a meaning well known in the art and can be detected by using equipment and methods well known in the art. For example, the negative electrode plate is placed in a solvent such as water for immersion, the negative electrode active material is separated from the negative electrode current collector, and the negative electrode active material is obtained by filtration. The negative electrode active material is measured using an ICAP7400 inductively coupled plasma-emission spectrometer of ThermoFisher Scientific, USA, with reference to GB / T30902-2014 standard to obtain the silicon content.

[0423] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The present invention does not particularly limit the type of the negative electrode conductive agent. For example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5 wt%.

[0424] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The present embodiments do not specifically limit the type of negative electrode binder. For example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resins (e.g., polyacrylic acid (PAA), polymethacrylic acid (PMAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS). In some embodiments, the weight percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0425] In some embodiments, the negative electrode film layer may optionally include other additives. For example, these additives may include thickeners, such as sodium carboxymethylcellulose (CMC-Na), PTC thermistor materials, and the like. In some embodiments, the mass percentage of these additives in the negative electrode film layer is ≤ 2 wt%.

[0426] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0427] In some embodiments, the separator includes a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0428] The embodiments of the present application have no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0429] In some embodiments, the material of the separator may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0430] In some embodiments, the separator may include a porous base membrane and a coating layer disposed on at least one side of the porous base membrane, and the coating layer may include at least one of inorganic particles or organic particles.

[0431] The porous base membrane may include one or more of polyethylene and polypropylene.

[0432] The inorganic particles have good heat resistance and can improve the overall heat resistance of the separator. Within the operating voltage range of the sodium-ion battery, the inorganic particles essentially do not undergo oxidation and reduction reactions with metal dendrites. In other words, the inorganic particles are configured to not undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium-ion battery.

[0433] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, aluminum oxide Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, zirconium titanate SrTiO3, barium titanate BaTiO3 and magnesium fluoride MgF2.

[0434] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0435] In some embodiments, the battery cell 30 further includes an electrolyte.

[0436] During the charge and discharge process of the battery cell, active ions are embedded and released back and forth between the positive and negative electrodes, and the electrolyte plays a role in conducting active ions between the positive and negative electrodes. The present embodiment of the application does not specifically limit the type of electrolyte, and can be selected according to actual needs.

[0437] The electrolyte solution includes an electrolyte salt and a solvent. The types of the electrolyte salt and the solvent are not particularly limited and can be selected according to actual needs.

[0438] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and additives that improve battery low-temperature power performance.

[0439] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0440] It can be understood that when the battery cell 30 is a lithium iron phosphate battery cell, in the positive electrode material of the battery cell 30, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it can include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0441] For example, when the battery cell 30 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which can be LiFePO4, i.e., lithium iron phosphate), the binder can be PVDF (polyvinylidene fluoride), and the conductive agent can be conductive carbon black. The ratio of LFP:PVDF:conductive carbon black can be 96:2:2. That is, out of 100 parts by weight of the total positive electrode active material, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight of the positive electrode active material can be expressed in grams.

[0442] When the battery cell 30 is a ternary battery cell, the positive electrode material of the battery cell 30 comprises 96 parts by weight of the positive electrode active material, 2-3 parts by weight of the binder (e.g., including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and 1-2 parts by weight of the conductive agent (e.g., including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). The ternary battery cell may be, but is not limited to, a lithium nickel cobalt manganese oxide (LNO)-based battery, a lithium nickel cobalt aluminum oxide (LNO)-based battery, or the like.

[0443] For example, the ternary material of the ternary battery cell can be eight series LiNi 0.8 Co 0.1 Mn 0.1 O2, the weight ratio of the positive electrode active material, binder and conductive agent is 96:2.5:1.5, that is, the total weight of the positive electrode material is divided into 100 parts, the eight series LiNi 0.8 Co 0.1 Mn 0.1 O2 accounts for 96 parts, the binder accounts for 2.5 parts, and the conductive agent accounts for 1.5 parts.

[0444] In the above technical solution, when the battery cell 30 is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of undergoing electrochemical reactions can be accommodated within the limited electrode assembly, which is beneficial for increasing the capacity and energy density of the battery device 100. This allows the lithium iron phosphate battery cell to output a higher amount of electricity while being relatively small in size and weight, meeting application scenarios with certain energy density requirements. The use of the binder and conductive agent within the above ranges can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the battery cell 30 is a ternary battery cell, due to the relatively complex structure and surface properties of the ternary material itself, the use of the above-mentioned proportions of positive electrode active material, binder, and conductive agent is beneficial for ensuring good bonding between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, reducing the risk of active material shedding and electrode pulverization during charge and discharge, and extending the cycle life of the battery device 100.

[0445] Second, please refer again to Figure 1 An embodiment of the present application provides an electrical device, which includes the battery device 100 of any of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0446] The power-consuming device may be a vehicle 1000 , and the battery device 100 may be installed at the bottom of the vehicle body.

[0447] In the electrical device of the technical solution of the present application, at least two adjacent second sampling parts 82 can collect parameters of two or more battery cells, so that the total number of sampling parts (including the first sampling part 81 and the second sampling part 82) can be reduced accordingly, and the connecting harness 70 can also be shortened and streamlined, making the structure of the battery device 100 more compact and saving space, thereby helping to improve the energy density of the battery device 100 and reducing costs to a certain extent.

[0448] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery cell group, comprising a plurality of battery cells arranged in series; A sampling component includes multiple sampling parts, a connecting harness and an output port, each of the sampling parts is electrically connected to at least one of the connecting harnesses, and the multiple connecting harnesses are connected to the output port. The multiple sampling parts include a first sampling part and a second sampling part, and the first sampling part and the second sampling part both have sampling points that can be electrically connected to the series path of the battery cells. The number of the first sampling parts is two, and they are respectively electrically connected to the battery cells at the head end and the battery cells at the tail end of the multiple battery cells connected in series in sequence; and on the series path of the multiple battery cells, the number of the battery cells between at least two adjacent sampling points of the second sampling parts is greater than or equal to two.

2. The battery device according to claim 1, characterized in that: On a series path of the plurality of battery cells, the number of the battery cells between every two adjacent sampling points of the second sampling parts is equal and greater than or equal to two.

3. The battery device according to claim 2, characterized in that: On a series path of the plurality of battery cells, there are one or more battery cells between a sampling point of the first sampling portion and an adjacent sampling point of the second sampling portion.

4. The battery device according to claim 3, characterized in that: The plurality of battery cells are arranged into a battery row along a first direction, the battery cell group includes at least one battery row, the sampling points of the two first sampling parts are respectively located on both sides of the battery cell group along a second direction, the sampling points of the second sampling part are distributed on the same side or different sides of the battery row in the second direction, and the second direction forms an angle with the first direction.

5. The battery device according to claim 4, characterized in that: There are multiple battery rows, and the multiple battery rows are arranged along the second direction and / or the third direction. The sampling points of the second sampling part are distributed on at least one side of one of the battery rows along the arrangement direction of the battery rows themselves, and the first direction, the second direction and the third direction form angles with each other.

6. The battery device according to claim 5, characterized in that: The number of the battery rows is two and the two battery rows are arranged along the second direction, and the sampling points of the second sampling part are distributed between the two battery rows.

7. The battery device according to claim 5, characterized in that: The number of the battery rows is two, the two battery rows are arranged along the second direction, and the sampling points of the second sampling portion are distributed on both sides of one of the battery rows along the second direction.

8. The battery device according to claim 1, characterized in that: The connecting harness is at least one of a flexible circuit board and a harness.

9. The battery device according to claim 1, characterized in that: The battery device includes a battery monitoring unit, each of the battery cells is electrically connected to the battery monitoring unit via a connecting harness, the connecting harness includes a first end and a second end opposite to each other, the first end forms the sampling unit, and the second end is electrically connected to the battery monitoring unit.

10. The battery device according to claim 9, characterized in that: The second end is connected to the battery monitoring unit by welding.

11. The battery device according to claim 9, characterized in that: The second end is connected to the output port, the battery monitoring unit is provided with a connector, and the output port is plugged into the connector.

12. The battery device according to claim 11, characterized in that: The battery device includes an electrical connector, a first adapter wire and a second adapter wire, wherein the first adapter wire and the second adapter wire are both connected to the electrical connector, the second ends of the plurality of connecting harnesses are connected to the electrical connector through the corresponding first adapter wires, and the end of the second adapter wire away from the electrical connector is connected to the output port and plugged into the battery monitoring unit.

13. The battery device according to claim 9, characterized in that: The multiple battery cells are arranged into battery rows along a first direction, the number of the battery rows is at least two groups, at least two groups of the battery rows are arranged along a second direction, the battery monitoring unit is arranged on one side of all the battery rows or in the middle of two adjacent battery rows along the second direction, and the first direction and the second direction are arranged at an angle.

14. The battery device according to claim 13, characterized in that: The battery cell includes a shell and a conductive part, the conductive part is arranged at the end of the shell along the second direction, the conductive parts of two adjacent battery cells along the second direction are connected, and the first end is connected to a part of the conductive part to form the sampling part.

15. The battery device according to claim 14, characterized in that: The first end portion is welded or bonded to the conductive portion.

16. The battery device according to claim 14, characterized in that: A corner space is formed at a corner of the shell along the third direction, the connecting harness is at least partially located in the corner space, the connecting harness extends along the second direction, and the first direction, the second direction and the third direction are arranged at angles to each other.

17. The battery device according to claim 14, characterized in that: All the conductive parts of the multiple cells of the cell group located on the same side are arranged in sequence along the first direction, and along the third direction, the multiple conductive parts and the ends of the cell group form a receiving gap, and the battery monitoring unit is arranged in the receiving gap.

18. The battery device according to claim 17, characterized in that: The battery device includes an electrical connector, which is disposed in the accommodating gap and located between the conductive portion and the battery monitoring unit, and electrically connects the battery monitoring unit and the conductive portion.

19. The battery device according to claim 9, characterized in that: The battery device comprises a main control board, and the battery monitoring unit is electrically connected to the main control board.

20. The battery device according to claim 17, characterized in that The battery device comprises a box body, the box body comprises a bottom plate, and the accommodating gap is located between the bottom plate and the conductive part.

21. The battery device according to claim 20, characterized in that The battery device comprises a bracket connected to the box body, and the battery monitoring unit is installed on the bracket.

22. The battery device according to claim 20, characterized in that The battery monitoring unit is bonded to a box wall of the box body.

23. The battery device according to claim 17, characterized in that: The length of the battery monitoring unit extends along a first direction.

24. The battery device according to claim 14, characterized in that The shell is made of a soft outer packaging material. In the first direction, a reinforcing partition is sandwiched between at least two adjacent battery cells. The reinforcing partition is connected to the shell, and the hardness of the reinforcing partition is greater than the hardness of the shell.

25. The battery device according to claim 24, characterized in that The thickness of the reinforcing partition is smaller than the thickness of the battery core.

26. The battery device according to claim 24, characterized in that The reinforcing partition is a metal plate.

27. The battery device according to claim 24, characterized in that The reinforcing partition is a heat conducting member and is heat-conductingly connected to the shell.

28. The battery device according to claim 24, characterized in that The reinforced partition is a solid structure.

29. The battery device according to claim 24, characterized in that A cavity is formed in the reinforced partition.

30. The battery device according to claim 29, characterized in that The cavity includes a heat exchange flow channel for the flow of heat exchange medium.

31. The battery device according to claim 24, characterized in that The reinforcing partition includes a connecting portion protruding from the housing along the second direction, and the connecting portion is located on a side of the conductive portion away from the battery monitoring unit.

32. The battery device according to claim 24, characterized in that In the first direction, two adjacent reinforcing partitions are connected by a connecting plate, and the battery cell is accommodated in a space surrounded by the connecting plate and the two reinforcing partitions.

33. The battery device according to claim 32, characterized in that The two adjacent reinforcing partitions in the first direction and the connected connecting plate are formed into an integral structure.

34. The battery device according to claim 14, characterized in that The conductive parts of two adjacent battery cells are directly connected.

35. The battery device according to claim 34, characterized in that The conductive parts of two adjacent battery cells are connected by welding.

36. The battery device according to claim 34, characterized in that The conductive parts of two adjacent battery cells are directly connected via conductive glue.

37. The battery device according to claim 14, characterized in that The plurality of battery cells are bonded and matched in sequence along the first direction, the battery cell has a first surface and a second surface, and the second surface is adjacent to the first surface; The battery device includes a case, an adhesive layer and a blocking member. The adhesive layer is arranged on one side of the battery cell group located on the first surface and is used to adhere the multiple battery cells to the case. The blocking member is located between at least one of the battery cells at both ends of the battery cell group in the first direction and the adhesive layer, and is used to prevent the adhesive layer from overflowing from the first surface of the battery cell to the corresponding second surface of the battery cell.

38. The battery device according to claim 37, characterized in that The blocking member at least covers the corner position corresponding to the battery cell.

39. The battery device according to claim 37, characterized in that The blocking member at least covers an edge position corresponding to the battery cell in the first direction.

40. The battery device according to claim 37, characterized in that A blocking member is provided between two adjacent battery cells along the first direction.

41. The battery device according to claim 1, characterized in that The battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

42. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 41, wherein the battery device is used to provide electrical energy.

Images