Battery device and electric device

Abstract

A battery device (100), comprising a battery cell group (20) and a sampling assembly (80). The battery cell group (20) comprises a plurality of battery cells (30) sequentially connected in series. The sampling assembly (80) comprises a plurality of sampling portions, connecting wire harnesses (70) and an output port (921). Each sampling portion is electrically connected to at least one connecting wire harness (70), and the plurality of connecting wire harnesses (70) are all connected to the output port (921). The plurality of sampling portions include first sampling portions (81) and second sampling portions (82), the first sampling portions (81) and the second sampling portions (82) both having sampling points capable of being electrically connected to the series path of the battery cells (30). There are two first sampling portions (81), which are respectively electrically connected to the head-end battery cell (30) and the tail-end battery cell (30) among the plurality of battery cells (30) sequentially connected in series. 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.

Description

Battery devices and electrical appliances Technical Field

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

[0002] In related technologies, battery devices typically include multiple cells arranged in a housing. To collect parameters such as voltage or current from the cells for reference by the battery management system, each cell is electrically connected at its end to a battery monitoring unit. However, when the number of cells is large, the electrical connection paths between the cells and the battery monitoring unit may become redundant and complex, hindering further improvements in the energy density of the battery device. Summary of the Invention

[0003] In view of the above problems, this 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, this application provides a battery device. The battery device includes a cell pack and a sampling assembly, wherein:

[0005] A battery cell assembly consists of multiple battery cells connected in series.

[0006] The sampling assembly includes multiple sampling sections, connecting harnesses, and an output port. Each sampling section is electrically connected to at least one connecting harness, and all connecting harnesses are connected to the output port. The multiple sampling sections include a first sampling section and a second sampling section. Both the first and second sampling sections have sampling points that can be electrically connected to the series path of the battery cells. There are two first sampling sections, which are electrically connected to the first and last battery cells of the multiple battery cells connected in series, respectively. Furthermore, in the series path of the multiple battery cells, the number of battery cells between at least two adjacent sampling points of the second sampling section is greater than or equal to two.

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

[0008] According to some embodiments of this application, optionally, in the series path of multiple cells, the number of cells between every two adjacent sampling points of the second sampling section is equal and greater than or equal to two.

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

[0010] According to some embodiments of this application, optionally, in the series path of multiple cells, there are one or more cells between the sampling point of the first sampling unit and the sampling point of the adjacent second sampling unit.

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

[0012] According to some embodiments of this application, optionally, multiple battery cells are arranged in a battery pack along a first direction, the battery pack includes at least one battery pack, the sampling points of two first sampling units are respectively located on both sides of the battery pack along a second direction, the sampling points of the second sampling units are distributed on the same side or different sides of the battery pack 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 units are located on both sides of the cell group along the second direction. On the series path of multiple cells, the number of cells between the sampling points of adjacent second sampling units can be one or more, so as to save space while ensuring that the parameters of all cells are collected and to a certain extent improve the sampling accuracy.

[0014] According to some embodiments of this application, optionally, there are multiple battery packs, which are arranged along a second direction and / or a third direction. The sampling points of the second sampling unit are distributed on at least one side of one of the battery packs along its own arrangement direction, and the first direction, the second direction and the third direction form an angle between each other.

[0015] In the above technical solution, the sampling points of the second sampling unit are distributed on at least one side of one of the battery packs along its own arrangement direction, thereby saving the installation space of the sampling components, and the distribution position of the sampling points can be flexibly adapted to various arrangement methods of the battery cells.

[0016] According to some embodiments of this application, optionally, the number of battery packs is two and the two battery packs are arranged along a second direction, and the sampling points of the second sampling unit are distributed between the two battery packs.

[0017] In the above technical solution, the sampling points of the second sampling unit are distributed between two adjacent battery packs, thereby concentrating the position of the second sampling unit, which helps to save the installation space of the sampling components and facilitates wiring and assembly.

[0018] According to some embodiments of this application, optionally, the number of battery packs is two, the two battery packs are arranged along a second direction, and the sampling points of the second sampling unit are distributed on both sides of one of the battery packs 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 packs along the second direction. Each cell in the battery pack can be sampled individually, thereby improving the sampling accuracy locally. This is beneficial for the battery management system to accurately adjust the battery management strategy based on the sampling parameters.

[0020] According to some embodiments of this application, optionally, the battery device includes a battery monitoring unit, and each 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 forming a sampling section, and the second end being electrically connected to the battery monitoring unit.

[0021] In the above technical solution, at least one conductive part of each cell is electrically connected to the battery monitoring unit through a connecting harness. 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 cell through the sampling part and the connecting harness, thereby improving the sampling accuracy and helping the battery management system to accurately adjust the battery management strategy.

[0022] According to some embodiments of this 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 this 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 connected to the battery monitoring unit through an output port and a connector, thereby improving the connection reliability between the connection harness and the battery monitoring unit.

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

[0027] In the above technical solution, the second ends of multiple connecting wire harnesses are connected to the electrical connector through corresponding first adapter wires, and the end of the second adapter wire away from the electrical connector is connected to the battery monitoring unit. This allows multiple connecting wire harnesses to be combined and then connected to the battery monitoring unit, thereby simplifying the electrical connection lines between the connecting wire harnesses and the battery monitoring unit. This saves installation space and also facilitates identification, assembly, and maintenance.

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

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

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

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

[0032] According to some embodiments of this application, optionally, the battery cell includes a housing and a conductive portion, the conductive portion is disposed at the end of the housing along a second direction, the conductive portions of two adjacent battery cells along the second direction are connected, and the first end is connected to a portion of the conductive portion to form a sampling portion.

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

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

[0035] In the above technical solution, the first end of the connecting wire harness is welded or bonded to the conductive part, forming a sampling part. The second end is electrically connected to the battery monitoring unit. Thus, the first end of the connecting wire harness can sample the voltage of the connected battery cell, and the sampled voltage information is transmitted to the battery monitoring unit through the second end, ensuring the accuracy and stability of the sampling. The connecting wire harness achieves voltage sampling while simultaneously providing electrical connection, saving on the number of components and installation space.

[0036] According to some embodiments of this application, optionally, a corner space is formed at the corner of the housing along a third direction, the connecting harness is at least partially located in the corner space, the connecting harness extends along a 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 transition space is formed at the corner of the housing 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 housing 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 this application, optionally, the connecting harness is at least one of a flexible circuit board and a wire harness.

[0039] In the above technical solution, the connecting wire harness is at least one of a flexible circuit board and a wire harness. The connecting wire harness has good flexibility, so the connecting wire harness is arranged in the irregular structural space between the ends of multiple housings and the battery monitoring unit, which has good adaptability and helps to save the installation space of the connecting wire harness.

[0040] According to some embodiments of this application, optionally, all conductive parts of multiple cells of the battery cell group located on the same side are arranged sequentially along a first direction, and along a third direction, multiple conductive parts form a receiving gap with the end of the battery cell group, and the battery monitoring unit is disposed in the receiving gap.

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

[0042] According to some embodiments of this application, optionally, the battery device includes a battery monitoring unit and an electrical connector, the electrical connector being disposed in the receiving gap and located between the conductive part and the battery monitoring unit, the electrical connector being electrically connected to the battery monitoring unit and the conductive part.

[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. Thus, the conductive parts of multiple cells can be transferred to the battery monitoring unit through the electrical connector. This further utilizes the space of the accommodating gap in the third direction, making the structure more compact. Furthermore, it saves the installation space required for the battery monitoring unit while realizing the electrical connection between the battery monitoring unit and multiple cells.

[0044] According to some embodiments of this 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, a battery monitoring unit 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 a timely manner according to the status of the battery cells.

[0046] According to some embodiments of this application, optionally, the battery device includes a housing, the housing includes a base plate, and a receiving gap is located between the base plate and the conductive part.

[0047] In the above technical solution, the battery device houses the battery cell assembly through a housing. The housing provides support and protection for the battery cells. The housing gap is located between the bottom plate of the housing and the conductive part, so the boundary range of the housing gap in the third direction is relatively clear. Furthermore, the bottom plate can provide support for the battery monitoring unit in the housing gap, making the battery monitoring unit more stable when installed in the housing gap.

[0048] According to some embodiments of this application, optionally, the battery device includes a bracket connected to the housing, and the battery monitoring unit is mounted on the bracket.

[0049] In the above technical solution, the battery monitoring unit is installed on the bracket and connected to the housing. This allows the battery monitoring unit to be connected to the housing via the bracket, thereby increasing the installation stability and reliability of the battery monitoring unit and improving the overall rigidity and strength of the battery device.

[0050] According to some embodiments of this application, optionally, the battery monitoring unit is bonded to the wall of the enclosure.

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

[0052] According to some embodiments of this application, optionally, the length of the battery monitoring unit extends along a 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 the space utilization rate.

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

[0055] In the above technical solution, by setting a reinforcing partition between adjacent cells and making the hardness of the reinforcing partition greater than that of the flexible shell, it is convenient to group multiple cells together, which can improve the overall rigidity of the cell group formed by grouping multiple cells together, thereby facilitating the installation of the cell group formed by grouping multiple cells together and reducing the deformation of the cells after grouping.

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

[0057] In the above technical solution, by making the thickness of the reinforcing separator smaller than the thickness of the battery cell, the overall rigidity of the multiple battery cells can be improved while reducing the space occupied by the reinforcing separator, especially the space occupied by the reinforcing separator in the thickness direction of the battery cell, resulting in a higher overall energy density of the battery device.

[0058] According to some embodiments of this application, the reinforcing partition may optionally be a metal plate.

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

[0060] According to some embodiments of this application, optionally, the reinforcing partition is a heat-conducting element and is heat-conductingly connected to the housing.

[0061] In the above technical solution, by setting the reinforcing partition as a heat-conducting component and making it heat-conductingly connected to the shell, the reinforcing partition can enhance the overall rigidity of the battery cells after assembly, and at the same time, it can also have a thermal management function. By exchanging heat between the reinforcing partition and the battery cells, the temperature of the battery cells can be adjusted so that the battery cells can operate within a suitable temperature range.

[0062] According to some embodiments of this application, the reinforcing partition may optionally be a solid structure.

[0063] In the above technical solution, by setting the reinforcing separator as a solid structure, the reinforcing separator can have good structural strength and rigidity, and can play an effective strengthening role when the thickness of the reinforcing separator is small. This is beneficial to enable the battery cell assembly to have good strength and rigidity as well as high volumetric energy density.

[0064] According to some embodiments of this application, optionally, a cavity is formed within the reinforcing partition.

[0065] In the above technical solution, by setting a cavity inside the reinforcing partition, the reinforcing partition can enhance the overall rigidity of the battery cells after assembly, while the cavity inside the reinforcing partition can absorb the expansion and deformation of the battery cells. The cavity inside the reinforcing partition can provide a buffer for the deformation of adjacent battery cells and help reduce the weight of the reinforcing partition.

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

[0067] In the above technical solution, at least a portion of the cavity inside the reinforcing partition constitutes a heat exchange channel. By allowing the heat exchange medium to flow through the heat exchange channel inside the reinforcing partition, the heat exchange medium can exchange heat with the battery cell, thereby achieving effective regulation of the battery cell temperature.

[0068] According to some embodiments of this application, optionally, the reinforcing partition includes a connecting portion protruding from the housing in a second direction, the connecting portion being located on the side of the conductive portion away from the battery monitoring unit.

[0069] In the above technical solution, by making the end of the reinforcing partition protrude from the battery cell housing along the second direction and connect it to the housing, since the reinforcing partition is sandwiched between multiple battery cells and forms a battery cell group with multiple battery cells, and the overall hardness of the reinforcing partition is greater than that of the battery cell housing, the battery cell group as a whole has better strength and rigidity.

[0070] According to some embodiments of this application, optionally, in a first direction, two adjacent reinforcing partitions are connected by a connecting plate, and the battery cell is housed in the 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 housed in the space enclosed by the connecting plate and the two reinforcing partitions, thereby improving the strength of the reinforcing partitions and further increasing the installation reliability and stability of the battery cell.

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

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

[0074] According to some embodiments of this application, optionally, the conductive portions of two adjacent battery cells are directly connected.

[0075] In the above technical solution, by directly connecting the conductive parts of two adjacent cells in the cell assembly, the electrical connection devices between the cells can be eliminated or reduced, the number of components in the cell assembly can be reduced, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the cell assembly. Furthermore, by eliminating or reducing the electrical connection devices between the cells, the cost can also be reduced.

[0076] According to some embodiments of this application, optionally, the conductive parts of two adjacent battery cells are welded together.

[0077] In the above technical solution, the conductive parts of two adjacent cells in the cell assembly are connected by welding, thereby realizing the direct connection of the terminals of two adjacent cells in the cell assembly. This makes the connection method of the conductive parts of two adjacent cells in the cell assembly simple and reliable.

[0078] According to some embodiments of this application, optionally, the conductive parts of two adjacent battery cells are directly connected by conductive adhesive.

[0079] In the above technical solution, by connecting the conductive parts of two adjacent cells in the cell assembly with conductive adhesive, the terminals of two adjacent cells in the cell assembly are directly connected, making the connection method of the conductive parts of two adjacent cells in the cell assembly simple and reliable.

[0080] According to some embodiments of this application, optionally, multiple battery cells are sequentially bonded together along a first direction, and each battery cell has a first surface and a second surface, with the second surface and the first surface being adjacent to each other;

[0081] The battery assembly includes a housing, an adhesive layer, and a blocking member. The adhesive layer is disposed on one side of the cell assembly located on the first side and is used to bond multiple cells to the housing. The blocking member is located at least at one cell at each end of the cell assembly in the first direction between the cell and the adhesive layer and is used to prevent the adhesive layer from overflowing from the first side of the cell into the second side of the corresponding cell.

[0082] In the above technical solution, by setting a blocking member at least between at least one cell and the adhesive layer at both ends of the cell assembly in the first direction, the risk of adhesive overflowing from the first side of the cell to the second side during the assembly stage of the battery device can be reduced, and the probability of adhesive overflow forming a hard structure on the second side of the cell can be reduced. This can improve the problem of local stress concentration on the surface of the cell, reduce the risk of cell damage, and enhance the insulation between the first side of the cell and the casing, thereby improving the reliability of the cell and the reliability of the battery device.

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

[0084] In the above technical solution, by covering the corner of the corresponding battery cell with a blocking component, the probability of glue accumulating at the corner of the outermost battery cell can be effectively reduced, thus playing a better role in preventing glue overflow. At the same time, the size of the blocking component can be reduced, the amount of material used can be reduced, and a suitable space can be left on the first side for applying glue, thereby improving the bonding strength between the battery cell and the casing.

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

[0086] In the above technical solution, the blocking component can reduce the risk of adhesive overflow onto the second surface of a larger area of ​​the battery cell, thereby further reducing the risk of adhesive overflow forming a hard structure at the edge of the battery cell assembly, and further reducing the risk of battery cell damage, thus improving the reliability of the battery device.

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

[0088] In the above technical solution, a blocking component is provided between two adjacent battery cells. This blocking component can prevent glue from overflowing from the two opposite first surfaces of the two adjacent battery cells during the application of glue, thereby reducing the number of blocking components, simplifying the parts, and saving space.

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

[0090] In the above technical solutions, using the aforementioned cell types provides more options for battery device design to meet different usage requirements. Specifically, lithium iron phosphate cells offer advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; ternary lithium cells offer advantages such as high energy density and good electrochemical performance; and solid-state cells offer advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0091] Secondly, embodiments of this application provide an electrical device, which includes a battery device from any of the above embodiments, and the battery device is used to provide electrical energy.

[0092] In the power device of the present application, at least two adjacent second sampling units can collect parameters of two or more battery cells, thereby reducing the total number of sampling units and shortening and simplifying the connecting harness, which can save space, help improve the energy density of the battery device, and reduce costs to a certain extent.

[0093] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it according to the contents of the specification, and to make the above and other objects, features and advantages of this application more apparent and understandable, the following are specific examples of this application. Detailed implementation method. Attached Figure Description

[0094] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0095] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0096] Figure 2 is a partial structural schematic diagram of a battery device according to some embodiments of this application;

[0097] Figure 3 is an enlarged schematic diagram of part A in Figure 2;

[0098] Figure 4 is a three-dimensional structural diagram of a battery cell according to some embodiments of this application;

[0099] Figure 5 is a schematic diagram of the structure of a battery cell from a first direction view according to some embodiments of this application;

[0100] Figure 6 is a cross-sectional schematic diagram of a battery cell according to some embodiments of this application;

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

[0102] Figure 8 is a three-dimensional structural schematic diagram of a battery device according to some embodiments of this application;

[0103] Figure 9 is a schematic diagram of the battery device of some embodiments of this application without the top cover;

[0104] Figure 10 is a schematic diagram of the battery device of some other embodiments of this application without the top cover;

[0105] Figure 11 is an enlarged schematic diagram of part B of Figure 10;

[0106] Figure 12 is a schematic diagram of the series connection path of multiple battery cells in series according to some embodiments of this application;

[0107] Figure 13 is a schematic diagram of the series connection path of multiple battery cells in series according to some other embodiments of this application;

[0108] Figure 14 is a schematic diagram of the connection between the battery monitoring unit and the electrical connector in some embodiments of this application;

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

[0110] Figure 16 is an enlarged schematic diagram of part C in Figure 15;

[0111] Figure 17 is a cross-sectional schematic diagram of a reinforcing partition according to some embodiments of this application;

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

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

[0114] Figure 20 is a front view of the battery cell assembly in Figure 19;

[0115] Figure 21 is an enlarged view of part D in Figure 20;

[0116] Figure 22 is an exploded view of the structure of a battery device provided in another embodiment of this application;

[0117] Figure 23 is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0118] Figure 24 is a partial bottom view of the battery device provided in some embodiments of this application;

[0119] Figure 25 is a partial bottom view of a battery device provided in one embodiment of this application.

[0120] The reference numerals in the detailed embodiments are as follows: 1000-vehicle; 100-battery device; 200-controller; 300-motor; 10-box; 10a-accommodating space; 101-box body; 102-heat exchange plate; 11-top cover; 12-bottom plate; 111-box wall; 17-bracket; 171- Sub-bracket; 20-cell assembly; 201-accommodation gap; 202-battery row; 30-cell; 31-casing; 310-corner space; 311-first side; 312-second side; 33-conductive part; 331-lead-out part; 34-adhesive layer; 35-blocking member; 351-first part; 352-second part; 40-reinforcing 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 cable; 92-second adapter cable; 921-output port.

[0121] Detailed Implementation

[0122] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0123] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0124] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0125] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0126] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0127] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0128] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0129] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0130] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0131] 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 excessive current or overheating, thus affecting safety. Collecting battery voltage and current parameters and transmitting them to the Battery Management System (BMS) provides a reference for the BMS's control strategies, enabling timely and effective protection—a crucial method for ensuring battery safety.

[0132] In related technologies, battery devices typically include multiple cells arranged in a housing. To collect the voltage or current of the cells for reference by the battery management system, each cell is electrically connected at its end to a battery monitoring unit. However, the many-to-one electrical connection between multiple cells and the battery monitoring unit results in a large space occupied by the sampling components (including but not limited to conductive wires, connectors, etc.) and the battery monitoring unit within the housing, thus limiting the improvement of the battery device's energy density.

[0133] In view of the above, this application provides a battery device including a cell group and a sampling component. The cell group includes a plurality of cells connected in series, and the sampling component includes a plurality of sampling sections. In the series path of the plurality of cells, the number of cells between the sampling points of at least two adjacent sampling sections is greater than or equal to two, so that the number of sampling sections can be reduced accordingly. This allows the wiring harness connected to the sampling sections to be shortened and simplified, thereby saving installation space, increasing the energy density of the battery device, and reducing costs to a certain extent.

[0134] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery that can be used again after the battery cell has been discharged because the active materials can be activated by charging.

[0135] The battery apparatus mentioned in the embodiments of this application may include multiple battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0136] In some embodiments, a battery cell assembly typically consists of multiple batteries arranged in a row.

[0137] As an example, a battery cell pack can be a battery module, which consists of multiple batteries arranged and fixed together to form a single module. As another example, a battery module can be formed by attaching multiple battery cells to a mounting plate with slots.

[0138] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more battery cell groups housed within the housing.

[0139] As an example, the battery pack can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0140] As an example, battery packs can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0141] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0142] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0143] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0144] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0145] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0146] Referring to Figures 2 and 3, the battery device 100 includes a cell assembly 20 and a sampling component 80. The cell assembly 20 includes a plurality of cells 30 arranged in series. The sampling component 80 includes a plurality of sampling sections, connecting harnesses 70, and an output port 921. Each sampling section is electrically connected to at least one connecting harness 70, and the plurality of connecting harnesses 70 are all connected to the output port 921. The plurality of sampling sections include a first sampling section 81 and a second sampling section 82. Both the first sampling section 81 and the second sampling section 82 have sampling points that can be electrically connected to the series path of the cells 30. There are two first sampling sections 81, which are electrically connected to the first cell 30 and the last cell 30 of the plurality of cells 30 arranged in series, respectively. In addition, in the series path of the plurality of cells 30, the number of cells 30 between at least two adjacent sampling points of the second sampling section 82 is greater than or equal to two.

[0147] The battery cell 30 includes a housing 31, an electrode assembly (not shown), and an electrolyte (not shown). The housing 31 is used to house the electrode assembly and the electrolyte. The housing 31 can be a flat body, a cuboid, a cylinder, or other shapes, etc., and this application embodiment does not limit this.

[0148] The electrode assembly consists of a positive electrode (not shown), a negative electrode (not shown), and a separator (not shown), and primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector protrudes beyond the coated one, serving 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. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0149] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0150] The sampling component 80 is used to collect parameters of the battery cell 30, including but not limited to current, voltage, and temperature. In a series of battery cells 30 connected in series, the first battery cell 30 is the first cell 30 in the battery cell group 20, and the last battery cell 30 is the last 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 electrode tab of the battery cell 30.

[0151] The sampling component 80 can collect parameters of the battery cell 30 between the sampling points of the two sampling units. Therefore, the two first sampling units 81 are electrically connected to the first and last battery cells 30 in the series path of the multiple battery cells 30, respectively, and the first sampling units 81 can collect parameters of the multiple battery cells 30 connected in series as a whole. The two adjacent second sampling units 82 can collect the number of all battery cells 30 between the sampling points of these two second sampling units 82.

[0152] The number of multiple cells 30 can be two or more. That is, the number of sampling units is at least two and they are electrically connected to the beginning and end of the two cells 30 connected in series, respectively.

[0153] In the series path of multiple cells 30, two adjacent sampling sections can 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 cells 30 between the sampling points of two adjacent second sampling sections 82 can be one, two, three or more, and the number of cells 30 between the sampling points of at least two adjacent second sampling sections 82 is greater than or equal to two.

[0154] In the series path of multiple cells 30, the number of cells 30 between at least two adjacent sampling points of the second sampling section 82 is greater than or equal to two. This means that the number of cells 30 between the sampling points of two adjacent second sampling sections 82 can occur in one, two, three, or more places. The number of cells 30 between any two adjacent second sampling sections 82 can be equal or unequal.

[0155] The number of cells 30 between sampling points of two adjacent second sampling units 82 can be less than or equal to the total number of cells 30.

[0156] In the above technical solution, the sampling points of two adjacent second sampling units 82 on the series path of multiple battery cells 30 can collect the parameters of the battery cell 30 between the two sampling points. There are at least two adjacent second sampling units 82 in the battery device that can collect the parameters of two or more battery cells 30, so that the number of sampling units can be reduced accordingly, and the wiring harness connected to the sampling units can also be shortened and simplified, thereby saving installation space, improving the energy density of the battery device, and reducing costs to a certain extent.

[0157] Referring to FIG12, according to some embodiments of the present application, optionally, in the series path of multiple cells 30, the number of cells 30 between every two adjacent sampling points of the second sampling section 82 is equal and greater than or equal to two.

[0158] Specifically, the number of cells 30 between any two adjacent sampling points of the second sampling section 82 can be two, three, four, or more. In the embodiment shown in FIG12, the number of cells 30 between any two adjacent sampling points of the second sampling section 82 is two.

[0159] In the above technical solution, in the series path of multiple battery cells 30, there are two battery cells 30 between every two adjacent sampling points of the second sampling unit 82. Compared with setting sampling units at both ends of each battery cell 30, the number of sampling units is reduced, and the sampling units can be connected to the battery monitoring unit 61 with shorter wire harnesses, thereby saving installation space and reducing costs to a certain extent.

[0160] Referring to Figures 12 and 13, according to some embodiments of this application, optionally, in the series path of multiple battery cells 30, there are one or more battery cells 30 between the sampling point of the first sampling unit 81 and the sampling point of the adjacent second sampling unit 82.

[0161] For example, as shown in Figures 12 and 13, in a series path of multiple battery cells 30, a first sampling unit 81 is electrically connected to the first battery cell 30. The sampling point of a second sampling unit 82 adjacent to the first sampling unit 81 is located between the first battery cell 30 and the next battery cell 30, such that there is one battery cell 30 between the sampling points of the first sampling unit 81 and the adjacent second sampling unit 82. The first sampling unit 81 and the adjacent second sampling unit 82 can collect the parameters of the first battery cell 30 independently. In this embodiment, another first sampling unit 81 is electrically connected to the last battery cell 30. The sampling point of the second sampling unit 82 adjacent to the first sampling unit 81 and the sampling point of the first sampling unit 81 can only have one battery cell 30 at the last end, so that the sampling component 80 can collect the parameters of the last battery cell 30 independently.

[0162] For example, the first sampling section 81, which is electrically connected to the first sampling section 30, has two or more sampling sections 30 between it and the adjacent second sampling section 82.

[0163] For example, there are two or more cells 30 between the first sampling section 81, which is electrically connected to the cell 30 at the tail end, and the adjacent second sampling section 82.

[0164] In the above technical solution, on the series path of multiple battery cells 30, the number of battery cells 30 between adjacent sampling points of the second sampling unit 82 can be one or more, thereby saving space while improving the sampling accuracy, and the distribution position of the sampling points can be flexibly adapted to various arrangement methods of battery cells 30.

[0165] Referring to Figures 12 and 13, according to some embodiments of this application, optionally, a plurality of battery cells 30 are arranged in a battery pack 202 along a first direction, the battery cell group 20 includes at least one battery pack 202, the sampling points of two first sampling units 81 are respectively located on both sides of the battery cell group 20 along a second direction, and the sampling points of the second sampling unit 82 are distributed on the same side or different sides of the battery pack 202 in the second direction, the second direction forming an angle with the first direction.

[0166] The first direction can be referred to as direction e1 in the attached drawing, and the second direction can be referred to as direction e2 in the attached drawing. The first direction e1 can 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 can refer to the thickness direction of the housing 31, and the second direction e2 refers to the length direction of the housing 31. The first direction e1 and the second direction e2 can be perpendicular to each other.

[0167] For example, as shown in Figures 12 and 13, the cell assembly 20 includes two battery packs 202 arranged along a second direction. Two adjacent cells 30 are connected in series along the second direction. The sampling points of the two first sampling units 81 are located on opposite sides of all cells 30 in the cell assembly 20 along the second direction, and the ends of the cells 30 to which the sampling points of the two first sampling units 81 are connected have opposite polarities. Further, the sampling points of the two first sampling units 81 may be located at the two ends furthest apart along the first direction.

[0168] As shown in Figure 12, all the sampling points of the second sampling units 82 are distributed on the same side of one of the battery packs 202 in the second direction.

[0169] As shown in Figure 13, the sampling points of the second sampling unit 82 are distributed on both sides of one of the battery packs 202 in the second direction, and located on one side of the other battery pack 202 in the second direction.

[0170] The sampling points of multiple second sampling units 82 located on the same side of the battery pack 202 in the second direction can be distributed at intervals along the first direction, thereby increasing the number of battery cells 30 between two adjacent sampling points on the series path of multiple battery cells 30.

[0171] In the above technical solution, the sampling points of the two first sampling units 81 are located on both sides of the cell group 20 along the second direction. On the series path of multiple cells 30, the number of cells 30 between the sampling points of adjacent second sampling units 82 can be one or more, so as to save space while ensuring that the parameters of all cells 30 are collected and to a certain extent improve the sampling accuracy.

[0172] According to some embodiments of this application, optionally, there are multiple battery packs 202, and the multiple battery packs 202 are arranged along a second direction and / or a third direction. The sampling points of the second sampling unit 82 are distributed on at least one side of one of the battery packs 202 along its own arrangement direction, and the first direction, the second direction and the third direction form an angle between each other.

[0173] Specifically, the number of battery packs 202 can be two or more. Multiple battery packs 202 can be arranged along a second direction. These battery packs 202 can be connected in series by sequentially connecting adjacent cells 30 in the second direction, or each battery pack 202 can be connected in series with adjacent cells 30 in the first direction, and then connected to another battery pack 202 through its first or last end in the first direction. Multiple battery packs 202 can also be arranged along a third direction, or arranged in a three-dimensional array along both the second and third directions.

[0174] In this embodiment, the two first sampling units 81 are electrically connected to the two battery cells 30 at the beginning and end of the series path, ensuring that all battery cells 30 can be sampled.

[0175] For example, multiple battery packs 202 are arranged along a second direction. These battery packs 202 can be connected in series by sequentially connecting adjacent battery cells 30 along the second direction. The sampling points of the second sampling unit 82 can be distributed on one side of one of the battery packs 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 greatly reducing the number of sampling units required.

[0176] In the above technical solution, the sampling points of the second sampling unit 82 are distributed on at least one side of one of the battery packs 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 be flexibly adapted to various arrangement methods of the battery cells 30.

[0177] Referring to FIG12, according to some embodiments of the present application, optionally, the number of battery packs 202 is two and the two battery packs 202 are arranged along the second direction, and the sampling points of the second sampling unit 82 are distributed between the two battery packs 202.

[0178] Specifically, two battery cells 30 arranged side-by-side in the second direction in the two battery packs 202 are connected in series. The sampling points of the second sampling unit 82 are distributed in the middle of the two battery packs 202. There is a battery cell 30 between each sampling point of the first sampling unit 81 and an adjacent sampling point of the second sampling unit 82. The two battery cells 30 located between the sampling points of the first sampling unit 81 and the second sampling unit 82 are respectively the battery cell 30 at the beginning and the battery cell 30 at the end of the battery cell group 20. The sampling points of the second sampling unit 82 are located in the middle of the two battery packs 202, so that along the path of multiple battery cells 30 connected in series, there are two battery cells 30 between every two adjacent sampling points of the second sampling unit 82.

[0179] In this embodiment, the first sampling unit 81 and the adjacent second sampling unit 82 can separately collect the parameters of the two cells 30 at the beginning and end, while every two adjacent second sampling units 82 along the path of multiple cells 30 connected in series collect the parameters of the two cells 30 between the two second sampling units 82.

[0180] In the above technical solution, the sampling points of the second sampling unit 82 are distributed between two adjacent battery packs 202, thereby concentrating the position of the second sampling unit 82, which helps to save the installation space of the sampling component 80 and facilitates wiring and assembly.

[0181] Referring to FIG13, according to some embodiments of the present application, optionally, the number of battery packs 202 is two, the two battery packs 202 are arranged along the second direction, and the sampling points of the second sampling unit 82 are distributed on both sides of one of the battery packs 202 along the second direction.

[0182] Specifically, the two battery packs 202 are a first battery pack 202 and a second battery pack 202, wherein the sampling points of the second sampling section 82 are distributed on both sides of the first battery pack 202 along the second direction, while the second battery pack 202 has the second sampling points distributed only on the side closer to the first battery pack 202. In this embodiment, the output port 921 can be located close to the side of the first battery pack 202 along the second direction to simplify the wiring and shorten the total length of the connecting harness 70.

[0183] Furthermore, in the first battery pack 202, each cell 30 can have a sampling point on each side of a second sampling unit 82 to collect parameters of each cell 30 in the first battery pack 202, thereby improving sampling accuracy. In the second battery pack 202, the second sampling unit 82 samples every two adjacent cells 30 along the series path as a group.

[0184] In other embodiments, sampling points located on the same side of the first battery pack 202 may be spaced between two or more battery cells 30. Since the sampling points on both sides of the first battery pack 202 are more densely distributed than those on both sides of the second battery pack 202, the sampling accuracy of the first battery pack 202 can be improved, while reducing the total number of sampling units.

[0185] In the above technical solution, the sampling points of the second sampling unit 82 are distributed on both sides of one of the battery packs 202 along the second direction. Each cell 30 in the battery pack 202 can be sampled individually, thereby improving the sampling accuracy locally. This is beneficial for the battery management system to accurately adjust the battery management strategy according to the sampling parameters.

[0186] Please refer to Figure 12. According to some embodiments of this application, optionally, multiple battery cells 30 are arranged in a battery pack 202 along a first direction, and the number of battery packs 202 is at least two groups. At least two groups of battery packs 202 are arranged along a second direction, and the battery monitoring unit 61 is disposed on one side of all the battery packs 202 or in the middle of two adjacent battery packs 202 along the second direction. The first direction and the second direction are arranged at an angle.

[0187] In the above technical solution, multiple battery cells 30 are arranged in a battery pack 202 along the first direction. The number of battery packs 202 is at least two, which can increase the overall output voltage of the battery device. Along the second direction, the battery monitoring unit 61 is set between the two battery packs 20 or on one side of all the battery packs 20, so that the structure is more compact and saves space in the second direction.

[0188] According to some embodiments of this application, optionally, the battery cell 30 includes a housing 31 and a conductive portion 33. The conductive portion 33 is disposed at the end of the housing 31 along a second direction. The conductive portions 33 of two adjacent battery cells 30 along the second direction are connected. The first end 71 of the connecting wire harness 70 is connected to a portion of the conductive portion 33 to form a sampling portion.

[0189] In the above technical solution, the conductive parts 33 of two adjacent cells 30 arranged along the second direction are connected, which can eliminate or reduce the electrical connection devices between cells 30, reduce the number of components in the cell assembly 20, thereby saving the space occupied by the electrical connection devices and improving the energy density of the cell assembly 20. The conductive part 33 is connected to the first end 71 of the connecting wire harness 70 to form a sampling part, which simplifies the structure of the sampling part.

[0190] According to some embodiments of this application, optionally, the battery cell assembly 20 includes a plurality of battery cells 30 arranged along a first direction. Each battery cell 30 includes a housing 31 and a conductive part 33. The conductive part 33 is disposed at the end of the housing 31 along a second direction. All the conductive parts 33 of the plurality of battery cells 30 located on the same side of the battery cell assembly 20 are arranged sequentially along the first direction, and along a third direction, the plurality of conductive parts 33 and the end of the battery cell assembly 20 form a receiving gap 201. The battery monitoring unit 61 is disposed in the receiving 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.

[0191] The first direction can be referred to as direction e1 in the attached drawing, the second direction can be referred to as direction e2 in the attached drawing, and the third direction can be referred to as direction e3 in the attached drawing. In some embodiments of this application, the first direction, the second direction, and the third direction can be set perpendicular to each other.

[0192] The conductive part 33 is electrically connected to the electrode assembly and is at least partially exposed outside the housing 31. In this application, the battery cell 30 may be a battery cell with a flexible outer packaging material as the housing 31. The housing 31 is a flexible structure; for example, the housing 31 may be made of aluminum-plastic film.

[0193] The conductive part 33 of the battery cell 30 is connected to the electrode tab, and at least a portion of the conductive part 33 is located outside the housing 31 as a lead-out structure for the electrode assembly. The conductive part 33 can be used to electrically connect the battery cell 30 to other battery cells 30 or other components.

[0194] 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 approximated as a flat cuboid shape, and the battery cell 30 can be arranged with the thickness direction, length direction, and width direction of the shell 31 corresponding to the first direction, the second direction, and the third direction, respectively. Multiple battery cells 30 are arranged sequentially along their own thickness direction. That is, the dimension of the outer contour of the shell 31 in the second direction (length of the shell 31) can be significantly larger than the dimensions (width and thickness) in the first direction and the third direction, and the dimension of the outer contour of the shell 31 in the third direction (width) is also larger than the dimension (thickness) in the first direction.

[0195] Referring to Figures 3 to 5, conductive portions 33 may be provided at both ends of the 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 portions of the multiple conductive portions 33 protruding from the housing 31 form a receiving gap 201 in a third-direction interval spaced from one end of the cell assembly 20 along the third direction. In the third direction, the distance between the conductive portions 33 and the end of the cell assembly 20, i.e., the width of the receiving gap 201, is greater than or equal to the dimension of the battery monitoring unit 61 in the third direction.

[0196] Optionally, referring to FIG7, the distance by which the conductive portion 33 protrudes from the end of the housing 31 in the second direction is greater than or equal to the dimension of the battery monitoring unit 61 in the second direction.

[0197] It is easy to understand that the conductive part 33 at least partially protrudes from the end of the housing 31, causing the space occupied by the cell 30 in the battery device 100 to extend further outward from the volume of the housing 31. The accommodating gap 201 formed by the conductive part 33 and the end of the cell 30 in the third direction is included within the space occupied by the cell 30. Compared with the technology where the battery monitoring unit 61 is located outside the space occupied by the cell 30, the battery monitoring unit 61 provided in this application embodiment is located within the accommodating gap 201. That is, the battery monitoring unit 61 is installed using the space occupied by the cell 30, thereby making the structure more compact, improving space utilization, and thus increasing the energy density of the battery device 100.

[0198] Optionally, referring to FIG9, in the same cell assembly 20, all conductive portions 33 located on the same side can be arranged sequentially along the first direction and aligned with each other along the third direction. That is, the portions of the multiple conductive portions 33 protruding from the housing 31 are spaced equally from the ends of the cell assembly 20 along the third direction in the third direction.

[0199] The battery monitoring unit 61 can be directly connected to the conductive part 33, or indirectly connected to the conductive part 33 via a wire harness 70, connector, or other means. Each cell 30 in the battery device 100 can be electrically connected to the battery monitoring unit 61.

[0200] In the battery device 100 of this application embodiment, a plurality of battery cells 30 of the cell pack 20 are arranged along a first direction, and a conductive part 33 is provided at the end of the cell 30 along a second direction. All conductive parts 33 of the plurality of cells 30 located on the same side are arranged sequentially along the first direction, and all conductive parts 33 on this side together with the end of the cell pack 20 in a third direction form a receiving gap 201. The battery monitoring unit 61 is disposed 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, saving space, and thus helping to improve the energy density of the battery device 100.

[0201] The battery monitoring unit 61 is used to collect parameters such as voltage, current, and temperature of one or more 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 controller 200 (CSC, Cell Supervision Circuit) and is used to transmit the parameters of the battery cells 30 to the main control board (BMU, Battery Management Unit).

[0202] Referring to 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 receiving gap 201 formed by the conductive portions 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 which is connected to the battery monitoring unit 61, and the other end is connected to the electrical connector 62, so as to realize the electrical connection between the battery monitoring unit 61 and the electrical connector 62.

[0203] In this embodiment, optionally, the battery monitoring unit 61 and the electrical connector 62 are located in the receiving gap 201 formed on the upper and lower sides of the conductive part 33 along a third direction, respectively.

[0204] Referring to Figure 7, the battery device 100 includes a battery monitoring unit 61 and an electrical connector 62. The battery monitoring unit 61 is connected to the electrical connector 62 and is housed together in a 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.

[0205] In this embodiment, the electrical connector 62 is optionally connected to the battery control unit via a plug-in connection, thereby improving connection reliability and saving installation space.

[0206] 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 a conductive part 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 part 33. Thus, the battery management system can monitor and adjust the battery cell assembly 20 through the battery monitoring unit 61. Furthermore, the battery monitoring unit 61 can further acquire parameters of the battery cell 30 for the battery management system to use as a reference for management strategies.

[0207] Referring to FIG7, 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 being located between the conductive part 33 and the battery monitoring unit 61, and the electrical connector 62 being electrically connected to the battery monitoring unit 61 and the conductive part 33.

[0208] Specifically, the electrical connector 62 and the battery monitoring unit 61 are housed together in the receiving gap 201. Multiple conductive parts 33, the electrical connector 62, and the battery monitoring unit 61 located on the same side can be stacked along a third direction. The electrical connector 62 can be connected to the multiple conductive parts 33 via a connecting wire harness 70, or it can be directly connected to a portion of the multiple conductive parts 33. The electrical connector 62 can be interconnected with the battery monitoring unit 61 via a power connection terminal, a wire harness, or a power connection part forming a tenon-and-mortise structure.

[0209] 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. Thus, the conductive parts 33 of the multiple battery cells 30 can be transferred to the battery monitoring unit 61 through the electrical connector 62. This further utilizes the space of the accommodating gap 201 in the third direction, making the structure more compact. Furthermore, it saves the installation space required for the battery monitoring unit 61 while realizing the electrical connection between the battery monitoring unit 61 and the multiple battery cells 30.

[0210] According to some embodiments of this 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.

[0211] Specifically, the main control board may integrate 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 part 33 to collect parameters such as current, voltage, and temperature of the battery cell 30. The battery monitoring unit 61 may include a slave controller 200, and the battery monitoring unit 61 can be connected to the main control board via a communication harness to transmit the parameters of the battery cell 30 to the main control board.

[0212] 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 a timely manner according to the state of the battery cell 30.

[0213] Please refer to Figures 7-10. According to some embodiments of this application, optionally, the battery device 100 includes a housing 10, the housing 10 includes a bottom plate 12, and the accommodating gap 201 is located between the bottom plate 12 and the conductive part 33.

[0214] Specifically, the housing 10 has a receiving space 10a, within which the battery cell assembly 20 is disposed. The receiving space 10a can refer to the space defined inside the housing 10 for accommodating the battery cell assembly 20 and other components. The shape of the housing 10 can be, but is not limited to, a cuboid, a cube, a cylinder, etc. The material of the housing 10 can be, but is not limited to, metallic or non-metallic materials. Metallic materials can include, but are not limited to, aluminum alloys, stainless steel, etc., while non-metallic materials can include, but are not limited to, plastics, carbon fiber composite materials, etc.

[0215] As an example, the housing 10 may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover 11 or a bottom plate 12.

[0216] As an example, the housing 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 the interior of the housing 10 forms an enclosed space to accommodate the battery cell assembly 20.

[0217] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0218] Optionally, the top cover 11 and the bottom plate 12 are opposite each other along a third direction. The battery cell assembly 20 is located in the area between the top cover 11 and the bottom plate 12, and one end of the battery cell assembly 20 in the third direction abuts against or is close to the top cover 11, while the other end of the battery cell assembly 20 in the third direction abuts against the bottom plate 12. The conductive part 33 and the end of the battery cell assembly 20 that abuts against the bottom plate 12 in the third direction form a receiving gap 201. The conductive part 33 protrudes from the end of the housing 31 in a second direction, and the conductive part 33 and the bottom plate 12 are opposite to each other and spaced apart in the third direction, jointly limiting the boundary range of the receiving gap 201. In this embodiment, the battery cell assembly 20 can be fixedly connected to the bottom plate 12.

[0219] Furthermore, in the third direction, the conductive part 33 is disposed near the top cover 11. That is, the distance between the conductive part 33 and the end of the battery cell assembly 20 near the top cover 11 is less than the distance between the conductive part 33 and the end of the battery cell assembly 20 near the bottom plate 12, so as to increase the space range of the accommodating gap 201.

[0220] In the above technical solution, the battery device 100 houses the battery cell assembly 20 through the housing 10. The housing 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 housing 10. Thus, the boundary range of the accommodating gap 201 in the third direction is relatively clear. Furthermore, the bottom plate 12 can provide support for the battery monitoring unit 61 in the accommodating gap 201, making the battery monitoring unit 61 more stably installed in the accommodating gap 201.

[0221] Referring to Figures 3 and 7, according to some embodiments of this application, optionally, the battery device 100 includes a bracket 17 connected to the housing 10, and the battery monitoring unit 61 is mounted on the bracket 17.

[0222] Specifically, the bracket 17 is located on at least one side of the cell assembly 20 along the second direction. This can be either on one side of the cell assembly 20 along the second direction or on both sides of the cell assembly 20 along the second direction. The battery monitoring unit 61 can be connected to the bracket 17 by at least one of the following methods: welding, screwing, riveting, snap-fit ​​connection, adhesive connection, or fastener connection. The battery monitoring unit 61 and the bracket 17 can be fixedly connected in a detachable manner.

[0223] Optionally, the bracket 17 includes a plurality of sub-brackets 171, which can be arranged along a first direction, and adjacent sub-brackets 171 can be connected. The plurality of sub-brackets 171 can be formed independently, for example, adjacent sub-brackets 171 can be welded together, connected by structural adhesive, or connected by fasteners; or, the plurality of sub-brackets 171 can be formed integrally.

[0224] Two adjacent sub-supports 171 can form a through mounting space along the extension direction (e.g., the first direction) of the battery monitoring unit 61 to accommodate the battery monitoring unit 61.

[0225] In the above technical solution, the battery monitoring unit 61 is installed on the bracket 17 and connected to the housing 10, so that the battery monitoring unit 61 can be connected to the housing 10 through the bracket 17, thereby increasing the installation stability and reliability of the battery monitoring unit 61, and also helping to improve the overall rigidity and strength of the battery device 100.

[0226] Optionally, according to some embodiments of this application, the battery monitoring unit 61 is bonded to the wall 111 of the housing 10.

[0227] Specifically, the enclosure walls 111 of the housing 10 enclose a receiving space 10a, and the enclosure walls 111 can be any one of the walls of the housing 10 in a first direction, a second direction, or a third direction. The battery monitoring unit 61 is disposed in the receiving gap 201, and at least one surface of it faces the housing 10. The surface of the battery monitoring unit 61 facing the housing 10 can be bonded to the inner wall surface of the housing 10.

[0228] For example, the conductive part 33, the end of the housing 31 along the second direction, and the base plate 12 together form a receiving gap 201. The battery monitoring unit 61 is received in the receiving gap 201, and the battery monitoring unit 61 is located between the conductive part 33 and the base 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 can be directly connected to the base plate 12, and / or, the battery monitoring unit 61 can be directly connected to the housing wall 111 of the housing 10 opposite in the second direction.

[0229] The battery monitoring unit 61 can be connected to the box wall 111 of the box body 10 via structural adhesive, glue, film, etc.

[0230] In the above technical solution, the battery monitoring unit 61 is bonded to the box wall 111 of the box 10, so that the battery monitoring unit 61 and the box wall 111 of the box 10 are connected as a whole. This facilitates the integration of the battery monitoring unit 61 and the box 10, saves space, and facilitates the assembly of internal components of the battery device 100. It also helps to provide insulation and protection between the battery monitoring unit 61 and the box 10.

[0231] Referring to FIG2, according to some embodiments of the present application, optionally, the length of the battery monitoring unit 61 extends along a first direction.

[0232] Specifically, referring to Figure 7, the receiving gap 201 is formed in the space between the conductive part 33 and the base plate 12 along a third direction. Multiple conductive parts 33 located on the same side are arranged sequentially along a first direction, causing the receiving gap 201 formed by the conductive parts 33 on the same side to extend along the first direction. The battery monitoring unit 61 is disposed in the receiving space 10a and extends along the extending direction of the receiving gap 201, that is, along the first direction. The outer contour of the battery monitoring unit 61 can be a long plate or a long strip.

[0233] 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 the space utilization rate.

[0234] Referring to Figures 2 and 9, according to some embodiments of this application, optionally, there are multiple battery cell groups 20, which are arranged along a second direction, and the battery monitoring unit 61 is disposed between two battery cell groups 20 or on one side of all battery cell groups 20.

[0235] Specifically, multiple cell groups 20 can all be electrically connected to the battery monitoring unit 61. The number of cells 30 can be two, three, or more. Multiple cells 30 in each cell group 20 are arranged along a first direction, and the ends of the cells 30 on the same side in a second direction can be aligned along the second direction.

[0236] For example, there are two battery cell groups 20, and the battery monitoring unit 61 can be set on one side of the two battery cell groups 20 on opposite sides along the second direction.

[0237] For example, there are two battery cell groups 20. The conductive parts 33 of the two battery cell groups 20 on the side close to each other along the second direction form a receiving gap 201 in the third direction. The battery monitoring unit 61 is disposed in the receiving gap 201 on the side close to each other of the two battery cell groups 20.

[0238] For example, the number of cell groups 20 is three, and the battery monitoring unit 61 can be set on the side of the first or last cell group 20 away from the other cell groups 20 along the second direction.

[0239] For example, there are three cell packs 20, and the battery monitoring unit 61 is disposed between two of the cell packs 20.

[0240] 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 set between two battery cell groups 20 or on one side of all battery cell groups 20, thereby making the structure more compact and saving space in the second direction.

[0241] Referring to Figures 3 and 7, according to some embodiments of this application, optionally, the battery monitoring unit 61 includes a battery monitoring unit 61, and at least one conductive part 33 of each cell 30 is electrically connected to the battery monitoring unit 61 via a connecting harness 70.

[0242] Specifically, each battery cell 30 may have 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 dimension of the battery cell 30 in the second direction may be significantly larger than its dimensions 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.

[0243] For example, in a plurality of battery cells 30, one of the two conductive parts 33 of each battery cell 30 is connected to the connecting harness 70 and is electrically connected to the battery monitoring unit 61 through the connecting harness 70; the other 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.

[0244] For example, in the plurality of battery cells 30, the two conductive parts 33 of each battery cell 30 are connected to the connecting harness 70 and electrically connected to the battery monitoring unit 61 through the connecting harness 70.

[0245] For example, 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.

[0246] In the above technical solution, at least one conductive part 33 of each cell 30 is electrically connected to the battery monitoring unit 61 through the connecting wire harness 70, so that the battery monitoring unit 61 can establish an electrical connection with each cell 30, thereby enabling the battery monitoring unit 61 to monitor the status of each cell 30 and improve the precision of the battery management system in monitoring and management.

[0247] Referring to Figures 4-6, according to some embodiments of this application, optionally, a corner space 310 is formed at a corner of the housing 31 along a third direction, and the connecting harness 70 is at least partially located within the corner space 310, with the connecting harness 70 extending along a second direction.

[0248] Specifically, the housing 31 includes a first surface 311 and a second surface 312 connected together. The first surface 311 is parallel to the plane containing the first and second directions, and the second surface 312 is parallel to the plane containing the second and third directions. 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 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 connecting the conductive part 33 and the battery monitoring unit 61 extends along the second direction and is accommodated in the corner space 310.

[0249] Furthermore, the connecting harness 70 can fit against the outer wall of the housing 31 within the corner space 310.

[0250] In the above technical solution, a corner space 310 is formed at the corner of the housing 31 along the third direction. The connecting wire harness 70 is at least partially located in the corner space 310. The connecting wire harness 70 extends along the second direction, and the corner of the housing 31 along the third direction also extends along the second direction, so that the connecting wire harness 70 can extend within the corner space 310, thereby making full use of the volume space occupied by the battery cell 30 to accommodate the connecting wire harness 70 and improving space utilization.

[0251] Referring to Figures 3 and 7, according to some embodiments of this application, optionally, the connecting harness 70 includes a first end 71 and a second end 72 opposite to each other, the first end 71 being welded or bonded to the conductive part 33, and the second end 72 being electrically connected to the battery monitoring unit 61.

[0252] Specifically, the first end 71 and the second end 72 are two opposite ends of the connecting wire harness 70 along the second direction. The first end 71 can be welded to the portion of the conductive part 33 protruding from the housing 31, or it can be bonded to the portion of the conductive part 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 it can be indirectly connected to the battery monitoring unit 61 through the electrical connector 62.

[0253] In the above technical solution, by welding or bonding the first end 71 of the connecting harness 70 to the conductive part 33, the stability of the connection between the first end 71 of the connecting harness 70 and the conductive part 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 the accuracy and stability of the sampling. The connecting harness 70 achieves voltage sampling while realizing electrical connection, which can save the number of parts and installation space.

[0254] According to some embodiments of this application, the second end 72 may optionally be connected to the battery monitoring unit 61 by welding.

[0255] In the above technical solution, the second end 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.

[0256] According to some embodiments of this 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.

[0257] In the above technical solution, the second end 72 is connected to the battery monitoring unit 61 through the output port 921 and the connector, thereby improving the connection reliability between the connection harness 70 and the battery monitoring unit 61.

[0258] In some embodiments, the portion of the connecting harness 70 between the first end 71 and the second end 72 may also be fixedly connected to the housing 31 by a fastener (not shown). There may be multiple fasteners, spaced apart along the extension direction of the connecting harness 70. The fasteners include, but are not limited to, tape, structural adhesive, cable ties, and wire clips.

[0259] Referring to FIG14, 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, both the first adapter wire 91 and the second adapter wire 92 are connected to the electrical connector 62, the second ends 72 of a plurality of connecting wire harnesses 70 are connected to the electrical connector 62 through the corresponding first adapter wire 91, and the end of the second adapter wire 92 away from the electrical connector 62 is connected to the battery monitoring unit 61.

[0260] It should be noted that Figure 14 shows the connection method between the electrical connector 62, the battery monitoring unit 61, and the connecting harness 70 in a modular form, through the first adapter cable 91 and the second adapter cable 92. The positions and shapes of the components in the figure are not intended to indicate the actual positional relationships and actual shapes. For example, the connecting harness 70, the first adapter cable 91, and the second adapter cable 92 are all flexible components. In the actual assembly process, they are often placed on the surface or in the gaps of structures such as the battery cell 30, the battery monitoring unit 61, or the housing 10 to obtain structural support and fix their positions.

[0261] Specifically, there are multiple first adapter wires 91, each corresponding to a connecting wire harness 70. The first ends 71 ​​of the multiple connecting wire harnesses 70 are welded or bonded to the conductive portions 33 of multiple battery cells 30. The second ends 72 of the multiple connecting wire harnesses 70 are connected to the electrical connector 62 via corresponding first adapter wires 91, ensuring that all battery cells 30 are electrically connected to the electrical connector 62. The electrical connector 62 is connected to the battery monitoring unit 61 via second adapter wires 92. The second adapter wires 92 can aggregate information transmitted by all second adapter wires 92 connected to the electrical connector 62, ensuring that all battery cells 30 are electrically connected to the battery monitoring unit 61.

[0262] In the above technical solution, the second ends 72 of multiple connecting wire harnesses 70 are connected to the electrical connector 62 through 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 multiple connecting wire harnesses 70 are combined and then connected to the battery monitoring unit 61, thereby simplifying the electrical connection lines between the connecting wire harnesses 70 and the battery monitoring unit 61, saving installation space, and facilitating identification, assembly and maintenance.

[0263] Referring to FIG14, according to some embodiments of this application, optionally, the end of the second adapter cable 92 away from the electrical connector 62 is connected to an output port 921, and the battery monitoring unit 61 is provided with a connector 611, and the output port 921 is plugged into the connector 611.

[0264] Specifically, the output port 921 can be a plug, and the output port 921 forms a connection terminal protruding from the end face of the output port 921; the connector 611 can be a socket, and the connector 611 has a connection terminal recessed relative to the surface of the connector 611. The connection terminal of the output port 921 is inserted into the connector 611 and keeps in contact with the connection terminal of the connector 611, so as to realize the electrical connection between the second adapter cable 92 and the battery monitoring unit 61.

[0265] For example, when output port 921 is connected to connector 611, connector 611 may be partially inserted into output port 921.

[0266] In the above technical solution, 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. The output port 921 is plugged into the connector 611. Thus, the circuit connection or disconnection between the battery monitoring unit 61 and the second adapter cable 92 can be realized by plugging and unplugging the output port 921 or the connector 611. The operation is convenient and helps to improve the assembly efficiency of the battery device.

[0267] According to some embodiments of this application, optionally, the connecting harness 70 is at least one of a flexible circuit board and a wire harness.

[0268] For example, there may be multiple connecting harnesses 70, which are flexible circuit boards. Each 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 part 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).

[0269] For example, there are multiple connecting harnesses 70, and all of the multiple connecting harnesses 70 are harnesses.

[0270] For example, there may be multiple connecting wire harnesses 70, which may include several flexible circuit boards and several wire harnesses.

[0271] The lengths of the multiple connecting wire harnesses 70 extending along the second direction are not equal. Some of the connecting wire harnesses 70 are connected to the conductive part 33 on the battery cell 30 that is farther away from the battery monitoring unit 61, and the connecting wire harnesses 70 are longer. Other connecting wire harnesses 70 are connected to the conductive part 33 on the battery cell 30 that is closer to the battery monitoring unit 61, and the connecting wire harnesses 70 are shorter.

[0272] In the above technical solution, the connecting harness 70 is at least one of a flexible circuit board and a wire harness. The connecting harness 70 has good flexibility, so the connecting harness 70 is arranged in an irregular structural space between the ends of multiple housings 31 and the battery monitoring unit 61, which has good adaptability and helps to save the installation space of the connecting harness 70.

[0273] Referring to Figure 12, according to some embodiments of this application, optionally, all the battery cells 30 are arranged in series, and the battery monitoring unit 61 collects the parameters of the battery cells 30 through a sampling unit connected to the conductive part 33. The sampling assembly 80 includes the battery monitoring unit 61 and a plurality of sampling units, which are connected to the battery monitoring unit 61.

[0274] Specifically, the battery cell 30 includes two conductive portions 33, which are respectively disposed at two ends of the housing 31 along the second direction, and the two conductive portions 33 are a positive conductive portion 33 and a negative conductive portion 33, respectively. Multiple battery cells 30 in the battery cell assembly 20 are arranged along a first direction, and 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 following battery cell 30, so that the multiple battery cells 30 in the battery cell assembly 20 are connected in series.

[0275] The battery device 100 may include a plurality of cell groups 20, which may be arranged along a second direction and all connected in series, and the plurality of cells 30 in each cell group 20 are all connected in series. For example, the first two or the last two cells 30 of two adjacent cell groups 20 along the second direction are connected in series in the first direction.

[0276] In the above technical solution, by connecting all the cells 30 in series, the battery device 100 can have a higher output voltage, and all the cells 30 are connected in series to form a unidirectional series path of multiple cells 30, which facilitates the sampling unit to collect the parameters of the pouch cells and also helps to simplify the algorithm of the battery management system to process the collected parameters of the cells 30.

[0277] Referring to FIG12, according to some embodiments of the present application, optionally, in the series path of multiple cells 30, the number of cells 30 between at least two adjacent sampling sections is greater than or equal to two.

[0278] Specifically, all the battery cells 30 in the battery device 100 can be connected in series to form a unidirectional series path of multiple battery cells 30. Several sampling units are arranged along the series path of multiple battery cells 30. These sampling units can be connected to conductive parts 33 and collect parameters such as voltage and current at corresponding positions of the conductive parts 33 in the series path of multiple battery cells 30. For example, along the current direction of the series path of multiple battery cells 30, the number of battery cells 30 between two adjacent sampling units can be one, two, three, four, six, or more. The number of battery cells 30 between any two adjacent sampling units can be unequal, with at least one pair of adjacent sampling units containing two or more battery cells 30.

[0279] In the above technical solution, two adjacent sampling units on the series path of multiple battery cells 30 can collect the parameters of the battery cells 30 between the two sampling units. The battery device 100 has at least two adjacent sampling units that can collect the parameters of two or more battery cells 30, so that the number of sampling units can be reduced accordingly. As a result, the wiring harness connected to the sampling units can also be shortened and simplified, thereby saving installation space and reducing costs to a certain extent.

[0280] Referring to FIG12, according to some embodiments of the present application, optionally, in the series path of multiple cells 30, the two conductive parts 33 of the first cell 30 and the last cell 30 are connected to sampling parts.

[0281] Specifically, each battery cell 30 includes a positive conductive portion 33 and a negative conductive portion 33, which can be respectively disposed at the ends of the battery cell 30 along the second direction. In the series connection path of 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 connected in series sequentially.

[0282] There are multiple sampling units. The first sampling unit is connected to the conductive part 33 of the first battery cell 30 along the series path of the multiple battery cells 30, which is not connected to the next battery cell 30. The last sampling unit is connected to the conductive part 33 of the last battery cell 30 along the series path of the multiple battery cells 30, which is not connected to the previous battery cell 30. That is, the first sampling unit and the last sampling unit are respectively located at the beginning and end of the series path of the multiple battery cells 30.

[0283] In the above technical solution, in the series path of multiple battery cells 30, the conductive part 33 of the first battery cell 30 and the last battery cell 30 are connected to a sampling unit, thereby ensuring that the sampling unit 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 battery management system management strategy.

[0284] Referring to FIG12, according to some embodiments of the present application, optionally, in the series path of multiple cells 30, there are two cells 30 between the first cell 30 and the last cell 30, and between two adjacent sampling sections.

[0285] Specifically, in 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, and each pair of adjacent sampling units can collect parameters of the two battery cells 30 in between. The sampling units can transmit the parameters of the battery cells 30 to the battery management system through the battery monitoring unit 61. The battery management system can obtain the estimated parameters of each battery cell 30 between the first and last battery cells 30 by processing the parameters of every pair of battery cells 30 between the first and last battery cells 30.

[0286] For example, in the series path of multiple cells 30, each pair of adjacent sampling sections can collect the total voltage of the cells 30 between the two adjacent sampling sections. Based on the total voltage and the number of cells 30 between the two adjacent sampling sections, the average voltage can be obtained; the average voltage is used as the voltage parameter of each cell 30.

[0287] Optionally, the multiple cells 30 in the battery device 100 may all have identical specifications. This can improve the accuracy of the battery management system in obtaining the estimated parameters for each cell 30.

[0288] In the above technical solution, in 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 units. Compared with setting sampling units at both ends of each battery cell 30 separately, the number of sampling units is reduced, and the sampling units can be connected to the battery monitoring unit 61 with shorter wire harnesses, thereby saving installation space and reducing costs to a certain extent.

[0289] Optionally, the number of cells 30 between any two adjacent sampling sections is not equal. In some groups, the number of cells 30 between two adjacent sampling sections is one, while in other groups, the number of cells 30 between two adjacent sampling sections is greater than or equal to two.

[0290] For example, the first and second sampling sections in the series path of multiple cells 30 are respectively connected to the two conductive sections 33 of the first cell 30, and the last two sampling sections are respectively connected to the two conductive sections 33 of the last cell 30.

[0291] In the above technical solution, the number of battery cells 30 between two adjacent sampling sections in several groups is one, and the number of battery cells 30 between two adjacent sampling sections in other groups is greater than or equal to two, thereby improving the sampling accuracy while shortening the wiring harness and reducing the number of sampling sections.

[0292] Referring to FIG13, according to some embodiments of the present application, optionally, the number of battery cell groups 20 is at least two groups, wherein each battery cell 30 in one battery cell group 20 has two conductive parts 33 provided with sampling parts.

[0293] For example, two cell groups 20 are arranged along a second direction, and every two adjacent cells 30 along the second direction are connected in series. All cells 30 in one cell group 20 are connected in series through cells 30 in the other cell group 20.

[0294] For example, in one of the two battery cell groups 20, each of the two conductive parts 33 of each cell 30 is provided with a sampling part, and in the other of the two battery cell groups 20, each pair of cells 30 has two conductive parts 33 that are far apart on the series path of the multiple cells 30, and sampling parts are provided on the two conductive parts 33 of each pair of cells 30.

[0295] In the above technical solution, the number of cell groups 20 is at least two groups, which can increase the overall output voltage of the battery device. Each cell 30 in one group of cell groups 20 has two conductive parts 33 equipped with sampling parts. Each cell 30 in this group of cell groups 20 can be sampled individually, thereby improving the sampling accuracy and helping the battery management system to accurately adjust the battery management strategy according to the sampling parameters.

[0296] According to some embodiments of this application, optionally, the conductive portions 33 of two adjacent cells 30 arranged along the second direction are connected and a sampling portion is provided.

[0297] In the above technical solution, the conductive parts 33 of two adjacent cells 30 arranged along the second direction are connected, which can eliminate or reduce the electrical connection devices between cells 30, reduce the number of components in the cell group 20, thereby saving the space occupied by electrical connection devices and improving the energy density of the cell group 20. The conductive parts 33 of two adjacent cells 30 arranged along the second direction are provided with sampling units, which can collect the parameters of two adjacent cells 30 along the second direction, improve the sampling accuracy, enrich the diversity of sampling methods, and thus improve the decision reliability of the battery management system.

[0298] Referring to Figures 7 and 12, according to some embodiments of this application, optionally, at least one conductive portion 33 of each cell 30 is electrically connected to the battery monitoring unit 61 via a connecting harness 70, the connecting harness 70 including a first end 71 and a second end 72 opposite to each other, the first end 71 forming a sampling portion.

[0299] Specifically, each battery cell 30 has a conductive portion 33 at both ends along the second direction, and the battery monitoring unit 61 is located on one side of the battery cell assembly 20 along the second direction. A connecting harness 70 extends along the second direction, with a second end 72 and a first end 71 being two opposite ends of the connecting 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 harnesses 70, the number of which is less than or equal to the number of conductive portions 33 and greater than or equal to the number of battery cells 30.

[0300] In the above technical solution, at least one conductive part 33 of each cell 30 is electrically connected to the battery monitoring unit 61 through a connecting harness 70. 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 cell 30 through the sampling part and the connecting harness 70, thereby improving the sampling accuracy and helping the battery management system to accurately adjust the battery management strategy.

[0301] Referring to Figures 15-17, according to some embodiments of this application, optionally, the housing 31 is made of a flexible outer packaging material. In a 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 the hardness of the reinforcing partition 40 is greater than the hardness of the housing 31. In this embodiment, the battery cell 30 is a pouch cell.

[0302] For example, the reinforcing partition 40 can be a metal plate, and the flexible shell can be an aluminum-plastic film.

[0303] The reinforcing partition 40 is sandwiched between two adjacent cells 30, including the following situations: a reinforcing partition 40 is provided between some adjacent cells 30, and no reinforcing partition 40 is provided between other adjacent cells 30; or, a reinforcing partition 40 is provided between every two adjacent cells 30.

[0304] The reinforcing partition 40 and the flexible outer shell of the battery cell 30 can be bonded and fixed together.

[0305] In the above technical solution, by setting a reinforcing partition 40 between adjacent cells 30 and making the hardness of the reinforcing partition 40 greater than that of the flexible shell, it is convenient to group multiple cells 30 together, which can improve the overall rigidity of the cell group 20 formed by grouping multiple cells 30 together, thereby facilitating the installation of the cell group 20 formed by grouping multiple cells 30 together and reducing the deformation of the cells 30 after grouping.

[0306] According to some embodiments of this application, optionally, the thickness of the reinforcing partition 40 is less than the thickness of the battery cell 30.

[0307] The thickness direction of the reinforcing partition 40 is consistent with the thickness direction of the battery cell 30. The battery cell 30 can be positioned with its thickness direction parallel to the first direction and approximately perpendicular to the third direction.

[0308] For example, referring to Figure 17, the thickness of the reinforcing partition 40 is d2, and the thickness of the battery cell 30 is d3, where d2 is less than d3. For example, the range of d2 is 0.8mm to 2.0mm; for example, d2 is 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, etc.

[0309] In the above technical solution, by making the thickness of the reinforcing separator 40 smaller than the thickness of the battery cell 30, the overall rigidity of the multiple battery cells 30 grouped together can be improved, while the space occupied by the reinforcing separator 40 can be reduced. In particular, the space occupied by the reinforcing separator 40 in the thickness direction of the battery cell 30 can be reduced, resulting in a higher overall energy density of the battery device 100.

[0310] According to some embodiments of this application, the reinforcing partition 40 may optionally be a metal plate.

[0311] In some embodiments, the reinforcing partition 40 is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0312] In the above technical solution, by setting the reinforcing partition 40 to a material such as aluminum plate, aluminum alloy plate, copper plate or steel plate, the reinforcing partition 40 can have higher strength and hardness, thereby better improving the overall rigidity of the group of multiple battery cells 30 and better reducing the deformation of the group of battery cells 30.

[0313] According to some embodiments of this application, optionally, the reinforcing partition 40 is a heat-conducting element and is heat-conductingly connected to the housing 31.

[0314] For example, the reinforcing partition 40 and the housing 31 can be thermally connected using thermally conductive adhesive. Since the reinforcing partition 40 is a thermally conductive component, it can transfer heat to the battery cell 30 or absorb the heat generated by the battery cell 30, thereby regulating the temperature of the battery cell 30.

[0315] In the above technical solution, by setting the reinforcing partition 40 as a heat-conducting component and heat-conductingly connecting it to the housing 31, the reinforcing partition 40 can enhance the overall rigidity of the battery cells 30 after assembly, and at the same time, it can also 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 can operate within a suitable temperature range.

[0316] According to some embodiments of this application, the reinforcing partition 40 may optionally be a solid structure.

[0317] For example, the reinforcing partition 40 can be a solid aluminum plate, aluminum alloy plate, copper plate or steel plate.

[0318] In the above technical solution, by setting the reinforcing partition 40 as a solid structure, the reinforcing partition 40 can have good structural strength and rigidity, and play an effective strengthening role when the thickness of the reinforcing partition 40 is small. This is beneficial to enable the battery cell assembly 20 to have good strength and rigidity as well as high volumetric energy density.

[0319] According to some embodiments of this application, optionally, a cavity 42 is formed within the reinforcing partition 40.

[0320] For example, referring to FIG17, the cavity 42 formed in the reinforcing partition 40 can be a plurality of spaced cavities 42, and the plurality of cavities 42 in the reinforcing partition 40 can be arranged at intervals along the width direction of the cell 30, and each cavity 42 can extend along the length direction of the cell 30.

[0321] In the above technical solution, by setting a cavity 42 in the reinforcing partition 40, the reinforcing partition 40 can enhance the overall rigidity of the battery cells 30 after assembly, while 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 help reduce the weight of the reinforcing partition 40.

[0322] Referring to FIG17, according to some embodiments of the present application, the cavity 42 may optionally include a heat exchange channel 43 for the flow of the heat exchange medium.

[0323] When at least a portion of the cavity 42 of the reinforcing baffle 40 is used as a heat exchange channel 43, the reinforcing baffle 40 can serve as at least a portion of a thermal management component.

[0324] For example, the reinforcing partition 40 can be connected to the battery cell 30 through thermally conductive adhesive, thereby facilitating heat exchange between the reinforcing partition 40 and the battery cell 30. During the process of the heat exchange medium flowing through the heat exchange channel 43, the temperature of the battery cell 30 can be regulated, for example, the temperature of the battery cell 30 can be increased or decreased.

[0325] In the above technical solution, at least a portion of the cavity 42 in the reinforcing partition 40 constitutes a heat exchange channel 43. By the heat exchange medium flowing through the heat exchange channel 43 in the reinforcing partition 40, the heat exchange medium can exchange heat with the battery cell 30, thereby achieving effective regulation of the temperature of the battery cell 30.

[0326] Referring to Figures 11 and 17, according to some embodiments of this application, optionally, the reinforcing partition 40 includes a connecting portion 41 protruding from the housing 31 in a second direction, the connecting portion 41 being located on the side of the conductive portion 33 opposite to the battery monitoring unit 61.

[0327] When a cavity 42 is formed within the reinforcing partition 40, the cavity 42 may not extend to the connecting part 41, that is, the connecting part 41 may be a solid structure.

[0328] In the above technical solution, by making the end of the reinforcing partition 40 protrude from the housing 31 of the battery cell 30 and connect it to the box 10, since the reinforcing partition 40 is sandwiched between multiple battery cells 30 and forms a battery cell group 20 with multiple battery cells 30, and the overall hardness of the reinforcing partition 40 is greater than that of the housing 31 of the battery cell 30, the battery cell group 20 as a whole has better strength and rigidity.

[0329] In some embodiments, the connecting part 41 can be connected to the housing 10. In this way, the connection of the connecting part 41 to the housing 10 enables the battery cell assembly 20 to be fixedly connected to the side wall of the housing 10. The connecting part 41 is a solid structure, which makes the connection between the battery cell assembly 20 and the housing 10 more reliable, thereby improving the installation reliability and stability of the battery cell assembly 20 in the housing 10.

[0330] Referring to FIG18, 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 housed in the space enclosed by the connecting plate 44 and the two reinforcing partitions 40.

[0331] Specifically, the connecting plate 44 connects the ends of the two reinforcing partitions 40 on the same side in the second direction. The connecting plate 44 can be a straight plate or an arc-shaped plate with a small curvature, and the connecting plate 44 is approximately parallel to the first direction. The connecting plate 44 and the two reinforcing partitions 40 connected to the connecting plate 44 can form a frame resembling the letter "U" and surround the cell 30 between the two reinforcing partitions 40.

[0332] In the above technical solution, two adjacent reinforcing partitions 40 are connected by a connecting plate 44, and the battery cell 30 is housed in the space enclosed by the connecting plate 44 and the two reinforcing partitions 40, thereby improving the strength of the reinforcing partitions 40 and further increasing the installation reliability and stability of the battery cell 30.

[0333] Referring to FIG18, according to some embodiments of the present application, optionally, two adjacent reinforcing partitions 40 in the first direction are formed into an integral structure with the connecting plate 44 connected thereto.

[0334] 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.

[0335] In the above technical solution, the strength of the reinforcing partition 40 is further improved by forming the connecting plate 44 connecting the two adjacent reinforcing partitions 40 in the first direction into an integral structure, thereby increasing the installation reliability and structural stability of the battery cell 30.

[0336] Referring to Figures 19-21, according to some embodiments of this application, optionally, the conductive portions 33 of two adjacent cells 30 are directly connected.

[0337] It should be noted that the conductive parts 33 of two adjacent cells 30 are directly connected. The part of the conductive part 33 exposed outside the housing 31 is defined as the lead-out part 331. The direct connection of the conductive parts 33 of two adjacent cells 30 is actually the direct connection of the lead-out parts 331 of the two conductive parts 33.

[0338] The term "direct connection" in "direct connection of the conductive parts 33 of two adjacent cells 30" means that there is no need to connect them through electrical connection devices. The conductive parts 33 of the two cells 30 are directly connected to achieve electrical connection between the two adjacent cells 30.

[0339] The electrical connection between two adjacent cells 30 can be a series connection.

[0340] In the above technical solution, by making the conductive parts 33 of two adjacent cells 30 in the cell group 20 directly connected, the electrical connection devices between the cells 30 can be eliminated or reduced, the number of components in the 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 cell group 20. Furthermore, by eliminating or reducing the electrical connection devices between the cells 30, the cost can also be reduced.

[0341] According to some embodiments of this application, optionally, the conductive portions 33 of two adjacent cells 30 are welded together.

[0342] For example, the conductive parts 33 of two adjacent cells 30 can be connected by laser welding or ultrasonic welding.

[0343] In the above technical solution, the conductive parts 33 of two adjacent cells 30 in the cell group 20 are connected by welding, thereby realizing the direct connection of the terminals of two adjacent cells 30 in the cell group 20, making the connection method of the conductive parts 33 of two adjacent cells 30 in the cell group 20 simple and reliable.

[0344] According to some embodiments of this application, optionally, the conductive portions 33 of two adjacent battery cells 30 are directly connected by conductive adhesive.

[0345] In some embodiments, the conductive portions 33 of two adjacent cells 30 are directly connected by conductive adhesive.

[0346] For example, conductive adhesive can be applied to a conductive part 33 of one of the two adjacent battery cells 30, and the conductive part 33 of the other battery cell 30 can be connected to the conductive part 33 coated with conductive adhesive; or, conductive adhesive can be applied to the conductive parts 33 of both adjacent battery cells 30, and the two conductive parts 33 coated with conductive adhesive can be connected by the conductive adhesive.

[0347] In the above technical solution, by connecting the conductive parts 33 of two adjacent cells 30 in the cell assembly 20 with conductive adhesive, the terminals of two adjacent cells 30 in the cell assembly 20 are directly connected, making the connection method of the conductive parts 33 of two adjacent cells 30 in the cell assembly 20 simple and reliable.

[0348] Referring to Figures 22 and 23, according to some embodiments of this application, optionally, a plurality of battery cells 30 are sequentially bonded together along a first direction, and each battery cell 30 has a first surface 311 and a second surface 312, wherein the second surface 312 and the first surface 311 are adjacent to each other.

[0349] The battery assembly 100 includes a housing 10, an adhesive layer 34, and a blocking member 35. The adhesive layer 34 is disposed on the side of the cell assembly 20 located on the first surface 311 and is used to bond a plurality of cells 30 to the housing 10. The blocking member 35 is located between at least one cell 30 at both ends of the cell assembly 20 in a 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 cell 30 into the second surface 312 of the corresponding cell 30.

[0350] Specifically, adhesive layer 34 can refer to the layered structure formed by the adhesive used to achieve bonding.

[0351] The blocking member 35 can refer to a structure or component used to prevent the adhesive layer 34 from overflowing from the first surface 311 of the battery cell 30 into the corresponding second surface 312 of the battery cell 30. For example, the blocking member 35 can be L-shaped and can partially cover the first surface 311, thereby preventing the adhesive from overflowing to the second surface 312; the blocking member 35 can also be a flat plate that partially covers the first surface 311 and extends beyond the second surface 312. When the adhesive overflows, the overflowing adhesive can be located on the other part of the blocking member 35 without contacting the second surface 312, thereby also serving to prevent adhesive overflow.

[0352] The first surface 311 and the second surface 312 can refer to two surfaces of the battery cell 30. The first surface 311 can be, but is not limited to, the bottom surface, top surface, or side surface of the battery cell 30, and can be fixed to the housing 10 by the adhesive layer 34. The second surface 312 can refer to the surface adjacent to the first surface 311. There can be one or more second surfaces 312. For example, the second surface 312 can be located at one or both ends of the first surface 311 in the first direction e1, or at one or both ends of the first surface 311 in the second direction e2, or at both ends of the first surface 311 in the first direction e1 and the second direction e2. The second direction e2 can refer to the other of the length direction or the width direction of the housing 10. For example, the first direction e1 can refer to the length direction of the housing 10, and the second direction e2 can refer to the width direction of the housing 10.

[0353] In the battery device 100 with the above-described structure, during the assembly stage, adhesive is applied between the first surface 311 of multiple cells 30 of the cell assembly 20 and the housing 10 to form an adhesive layer 34. Since the blocking member 35 is located between at least one cell 30 at both ends of the cell assembly 20 in the first direction e1 and the adhesive layer 34, the blocking member 35 can effectively reduce the risk of adhesive overflowing from the first surface 311 to the second surface 312 during the adhesive application process. This can effectively reduce the occurrence of adhesive overflow on the second surface 312 of the cell 30, which could form a rigid structure. When the cell 30 expands or shifts, it can also reduce the risk of local stress concentration caused by the contact between the surface of the cell 30 and the rigid structure, thus helping to reduce the probability of damage to the cell 30.

[0354] Secondly, the first surface 311 of the battery cell 30 is separated from the housing 10 by the adhesive layer 34, preventing the battery cell 30 from contacting the housing 10, thereby allowing the adhesive layer 34 to act as an insulator. Since the blocking member 35 is located at least between at least one battery cell 30 and the adhesive layer 34 at both ends of the battery cell assembly 20 in the first direction e1, the blocking member 35 can increase the distance between the first surface 311 of the battery cell 30 and the housing 10, that is, increase the insulation gap between the first surface 311 and the housing 10, and also help to increase the thickness of the adhesive layer 34, thereby further enhancing the insulation between the battery cell 30 and the housing 10.

[0355] In the above technical solution, by setting the blocking member 35 at least between at least one cell 30 and the adhesive layer 34 at both ends of the cell group 20 in the first direction e1, the risk of adhesive overflowing from the first surface 311 of the cell 30 to the second surface 312 during the assembly stage of the battery device 100 can be reduced, and the probability of adhesive overflow forming a hard structure on the second surface 312 of the cell 30 can be reduced. This can improve the problem of local stress concentration on the surface of the cell 30, reduce the risk of damage to the cell 30, and also enhance the insulation between the first surface 311 of the cell 30 and the housing 10, thereby improving the reliability of the cell 30 and the reliability of the battery device 100.

[0356] Referring to Figures 24 and 25, according to some embodiments of this application, optionally, the blocking member 35 covers at least the corner position of the corresponding cell 30.

[0357] It is understandable that the blocking member 35 can cover the first surface 311 of all the cells 30 in the cell assembly 20, or it can only cover the first surface 311 of the cells 30 located at both ends of the first direction e1, or it can only cover the corner positions of the first surface 311 of the cells 30 located at both ends of the first direction e1. In all three cases, the blocking member 35 can satisfy the requirement of at least covering the corner positions of the corresponding cells 30.

[0358] When adhesive is applied to the first surface 311 of all the cells 30 of the cell assembly 20, the adhesive will spread along the first direction e1 and the second direction e2 and accumulate at the four corners of the cell assembly 20. Therefore, the corners of the cell assembly 20 are more likely to have adhesive overflow than other locations.

[0359] In the above technical solution, by covering the corner position of the corresponding battery cell 30 with the blocking member 35, the probability of glue accumulating at the corner position of the outermost battery cell 30 can be effectively reduced, which plays a better role in preventing glue overflow. At the same time, the size of the blocking member 35 can be reduced, and the amount of material used can be reduced. It can also leave a suitable space on the first surface 311 for applying glue, thereby improving the bonding strength between the battery cell 30 and the housing 10.

[0360] Referring to FIG25, according to some embodiments of this application, optionally, the blocking member 35 covers at least the edge position of the corresponding cell 30 located in the first direction e1.

[0361] It is understood that in the above technical solution, the blocking member 35 can cover the first surface 311 of all the cells 30 in the cell group 20, or it can only cover the first surface 311 of the cells 30 located at both ends of the first direction e1, or it can only cover the edge position of the corresponding cell 30 located in the first direction e1. In the above three cases, the blocking member 35 satisfies the requirement of covering the edge position of the corresponding cell 30 located in the first direction e1.

[0362] Since multiple battery cells 30 are arranged along the first direction e1, the second surfaces 312 of the battery cells 30 located at both ends of the first direction e1 are typically large surfaces. By adopting the above technical solution, the blocking member 35 can not only reduce the risk of adhesive overflow onto the second surfaces 312 where the corners of the battery cells 30 are located, but also reduce the risk of adhesive overflow onto the large surfaces of the battery cells 30. This reduces the probability of adhesive overflow solidifying on the large surfaces of the battery cells 30 to form a hard structure, thereby further reducing the risk of damage to the battery cells 30.

[0363] In the above technical solution, the blocking member 35 can reduce the risk of glue overflowing onto the second surface 312 of the larger area of ​​the cell 30, thereby further reducing the risk of glue overflow forming a hard structure at the edge of the cell assembly 20, and further reducing the risk of damage to the cell 30, thus improving the reliability of the battery device 100.

[0364] In some embodiments of this application, referring to FIG24, the blocking member 35 is disposed at both ends of the battery cell assembly 20 located in the first direction e1. In the first direction e1, the size of the battery cell assembly 20 is L1, and the size of the blocking member 35 is L2, wherein 0.05≤L2 / L1.

[0365] 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. That is, depending on the value of the size L1 of the cell assembly 20, the blocking member 35 can be selected to a suitable size. For example, the size L2 of the blocking member 35 in the first direction e1 can be 5mm, 6mm, 7mm, etc.

[0366] Understandably, L2 / L1 must be at least 0.05. If L2 / L1 is less than 0.05, the size of the portion of the blocking member 35 corresponding to the first surface 311 is relatively small, and the area covered by the blocking member 35 on the first surface 311 is small. The blocking member 35 lacks sufficient solid portion to block the adhesive, increasing the risk of adhesive overflowing from the blocking member 35 onto the second surface 312, thus failing to provide effective adhesive spill prevention. Furthermore, the small size of the portion of the blocking member 35 corresponding to the first surface 311 also increases the risk of sharp objects piercing the first surface 311, further hindering its protective function.

[0367] In the above technical solution, by setting the size ratio of the blocking member 35 and the cell assembly 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 in a suitable range. This not only effectively prevents the glue from overflowing from the first surface 311 to the second surface 312, but also provides good protection, reducing the risk of sharp objects contacting the first surface 311 and damaging the cell 30, and improving the reliability of the battery device 100.

[0368] In some embodiments of this application, the area of ​​the blocking member 35 on the orthographic projection of the plane containing the first surface 311 is greater than or equal to the area of ​​all the first surfaces 311.

[0369] In some embodiments of this application, referring to FIG23, the blocking member 35 includes a first portion 351 and a second portion 352 connected together. 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.

[0370] It is understood that the second part 352 is set at an angle relative to the first part 351, and the angle between the two can be set as needed. For example, the angle between the second part 352 and the first part 351 is an obtuse angle, so that the blocking member 35 can be constructed as a V-shape; the angle between the second part 352 and the first part 351 can also be a right angle, so that the blocking member 35 can be constructed as an L-shape (see Figure 23). Optionally, the first part 351 and the first surface 311 can be connected by means including but not limited to heat fusion or adhesive bonding.

[0371] In the above technical solution, the first part 351 increases the gap between the first surface 311 and the housing 10, which helps to enhance the insulation between the battery pack 20 and the housing 10. The second part 352, being bent relative to the first part 351, provides better blocking, further reducing the risk of adhesive spreading to the second surface 312 adjacent to the first surface 311. The blocking member 35 with the above structure is relatively simple and easy to manufacture, reducing costs.

[0372] In some embodiments of this application, referring to Figures 22 and 23, the cell assembly 20 includes a reinforcing partition 40 and a connecting plate 44, with a plurality of cells 30 disposed between two adjacent reinforcing partitions 40 along a first direction. The reinforcing partitions 40 and the connecting plate 44 form openings that open toward the first surface 311.

[0373] By reinforcing the partition 40, a relatively robust 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 within the housing 10, reducing the risk of poor contact due to movement of the battery cells 30.

[0374] In some embodiments of this application, the blocking member 35 is made of insulating material.

[0375] Insulating materials can refer to materials including but not limited to ceramic, glass, plastic, rubber, or mica, among which plastic materials can include but not limited to polypropylene, polyetherimide, etc.

[0376] The blocking member 35 can enhance the insulation between the battery cell assembly 20 and the housing 10 by increasing the gap between the first surface 311 and the housing 10. On this basis, by setting the blocking member 35 as an insulating material, the blocking member 35 itself can have an insulating function, further enhancing the insulation between the battery cell 30 and the housing 10, reducing the risk of short circuits, and thus improving the reliability of the battery cell assembly 20.

[0377] In the above technical solution, by making the blocking member 35 an insulating material, it helps to further enhance the insulation between the first surface 311 of the cell 30 and the housing 10, thereby improving the insulation between the cell assembly 20 and the housing 10, which can improve the reliability of the battery device 100.

[0378] In some embodiments of this application, referring to FIG23, the wall thickness of the blocking member 35 is H, wherein 1mm≤H≤3mm.

[0379] H can be, but is not limited to, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc. It is understandable that if H is less than 1mm, the thickness of the blocking element 35 is too small, failing to provide adequate protection and insulation. For example, a smaller thickness of the blocking element 35 increases the risk of burrs from the housing 10's processing or external sharp objects piercing the blocking element 35 and penetrating the battery cell 30. Furthermore, increasing the gap between the first surface 311 and the housing 10 is relatively ineffective, failing to provide adequate insulation. When the blocking element 35 is made of insulating material, its small thickness also results in insufficient insulation performance.

[0380] Considering that the burrs of the housing 10 are generally less than 3mm, if H is greater than 3mm, the thickness of the blocking member 35 will be too large, which will lead to excessive protection performance. Moreover, the gap between the first surface 311 and the housing 10 will also be large, which is far from meeting the insulation requirements. When the blocking member 35 is made of insulating material, its own insulation performance will also be far beyond expectations. In other words, if H is greater than 3mm, the protection 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.

[0381] It should be noted that the wall thickness of the blocking member 35 can be selected according to different materials. For example, when the blocking member 35 is made of polyetherimide (PEI), it not only fulfills the function of preventing adhesive spillage but also possesses insulation properties. In this case, the wall thickness of the blocking member 35 can be 2mm, and the dimension of the portion corresponding to the first surface 311 in the first direction e1 can be 7mm. When the blocking member 35 is made of aluminum, it can be designed in an L-shape, and an insulating layer can be provided on its surface. In this case, the thickness of the blocking member 35 can be 1mm, and the dimension of the portion corresponding to the first surface 311 in the first direction e1 can be 5mm. When the blocking member 35 is made of polypropylene (PP), it can also be designed in an L-shape, with a thickness of 1.5mm and a dimension of the portion corresponding to the first surface 311 in the first direction e1 of 6mm.

[0382] 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 satisfying the protection and insulation. This can save the space occupied by the blocking member 35 and reduce 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, thereby increasing the energy density of the battery device 100.

[0383] In some embodiments of this application, the energy density of the battery cell 30 is E, and the melting point of the blocking member 35 is T1, wherein: when E≤390Wh / L, T1>150℃; when E>390Wh / L, T1>200℃.

[0384] When the energy density E of the battery cell 30 is greater than or equal to 390Wh / L, and the temperature at which the battery cell 30 experiences thermal runaway exceeds 200℃, the blocking component 35 can be made of a material with a melting point greater than 200℃. This reduces the risk of the blocking component 35 melting and causing performance damage during thermal runaway, and improves the high-temperature resistance of the blocking component 35. When the energy density E of the battery cell 30 is less than 390Wh / L, and the temperature at which the battery cell 30 experiences thermal runaway is less than 150℃, the blocking component 35 can be made of a material with a melting point greater than 150℃. This satisfies the high-temperature resistance requirements of the blocking component 35 while also helping to reduce costs.

[0385] For example, when the blocking component 35 is made of polypropylene (PP), its melting point is greater than or equal to 150°C; when the blocking component 35 is made of polyetherimide (PEI), its melting point is greater than or equal to 250°C; when the blocking component 35 is made of polyimide (PI), its melting point is greater than or equal to 300°C; when the blocking component 35 is made of aluminum with an insulating layer, its melting point is greater than or equal to 660°C; and when the blocking component 35 is made of steel with an insulating layer, its melting point is greater than or equal to 1000°C.

[0386] 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 suitable high temperature resistance, improve 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 conducive to reducing the cost of the battery device 100.

[0387] In some embodiments of this application, referring to FIG22, the housing 10 includes a plurality of housing walls 111, the plurality of housing walls 111 collectively defining an accommodating space 10a, and the first surface 311 and the blocking member 35 are bonded to the housing walls 111 by an adhesive layer 34.

[0388] The enclosure wall 111 can refer to the wall panel that forms the enclosure 10. Multiple enclosure walls 111 may include a top cover 11, a bottom plate 12, side enclosure walls, etc. In the above technical solution, the first surface 311 of the battery cell 30 can be bonded and fixed to one of the bottom plate 12, the top cover 11, and the side enclosure wall by an adhesive layer 34.

[0389] 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 reliable.

[0390] In some embodiments of this application, referring to FIG23, the housing 10 includes a housing body 101 and a heat exchange plate 102. The heat exchange plate 102 is connected to the housing body 101 and together with the housing body 101 defines an accommodating space 10a. The first surface 311 and the blocking member 35 are bonded to the heat exchange plate 102 by an adhesive layer 34.

[0391] The heat exchange plate 102 can refer to a component that can exchange heat with the battery cell 30 to regulate the temperature of the battery cell 30. For example, the heat exchange plate 102 can be a cold plate. In this technical solution, the heat exchange plate 102 and the housing body 101 can together form the housing 10. The heat exchange plate 102 can serve as a wall 111 of the housing 10. For example, if the housing body 101 has no bottom wall, the heat exchange plate 102 is connected to the bottom of the housing body 101, acting as the bottom wall of the entire housing 10; the heat exchange plate 102 can also be disposed on any wall panel of the housing body 101, forming a wall 111 of the housing 10 together with the corresponding wall panel.

[0392] In the above technical solution, by bonding and fixing 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 perform high-efficiency heat exchange on the battery cell 30 and quickly regulate the temperature of the battery cell 30, which is beneficial to improving the reliability of the battery cell 30 and thus improving the reliability of the battery device 100.

[0393] Optionally, the heat exchange plate 102 is located at the bottom of the main body 101 of the housing.

[0394] According to some embodiments of this 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.

[0395] Solid-state cells can be, but are not limited to, polymer solid-state cells, oxide solid-state cells, sulfide solid-state cells, halide solid-state cells, etc. Solid-state cells can also be semi-solid-state cells or all-solid-state cells.

[0396] In the above technical solutions, the use of the aforementioned cell types provides more options for the design of battery devices to meet different application needs. Specifically, cell 30 is a lithium iron phosphate cell, which has advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; cell 30 is a ternary lithium cell, which has advantages such as high energy density and good electrochemical performance; and cell 30 is a solid-state cell, which has advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0397] According to some embodiments of this application, optionally, the battery cell 30 is a lithium iron phosphate battery cell, and the ratio of the amount of positive active material, binder and conductive agent in the positive electrode material of the battery cell 30 is 96:(1-3):(1-3); the battery cell 30 is a ternary battery cell, and the ratio of the amount of positive active material, binder and conductive agent in the positive electrode material of the battery cell 30 is 96:(2-3):(1-2).

[0398] In some embodiments, the positive electrode of the cell 30 may be a positive electrode sheet, which may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer including a positive electrode active material.

[0399] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0400] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, silver-surfaced aluminum, or stainless steel can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0401] As an example, when the battery cell 30 in this embodiment 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 is beneficial to improving the energy density of the battery cell 30. However, this application is not limited to these materials, and other conventional materials that can be used as the positive electrode film layer of a battery may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0402] 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)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0403] Layered transition metal oxides include those with the general formula Li a Ni b Co c M d O e A fAt least one of the compounds and their modified compounds. 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, and further optionally, 0.75 ≤ b ≤ 0.98.

[0404] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, and lithium nickel cobalt manganese oxides (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), LiNi 0.9 Co 0.05 Mn 0.05 O2 (also known as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi) 0.80 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0405] When the battery cell 30 in this embodiment 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, polyanionic materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0406] As an example, positive electrode active materials for sodium-ion batteries may include NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, and NaNi 1 / 2 Ti 1 / 2 O2, NaNi 1 / 2 Mn 1 / 2 O2, Na2 / 3 Fe 1 / 3 Mn 2 / 3 O2, NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue materials, with the general formula X p M' q (PO4) r O x Y 3-x At least one of the materials in general formula X. p M' q (PO4) r O x Y 3-x In the given condition, 0 < p ≤ 4, 0 < q ≤ 2, 1 ≤ r ≤ 3, 0 ≤ x ≤ 2, and X includes H. + Li + Na + K + and NH4 + At least one of the following, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halide anion, optionally at least one of F, Cl and Br.

[0407] In the embodiments of this application, the modified compounds of the above-mentioned positive electrode active materials can be doped and / or surface coated to modify the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0408] During the charging and discharging process, the cell 30 experiences the insertion and extraction of active ions such as Li, resulting in a different molar content of Li in the cell 30 at different discharge states. In the examples of positive electrode active materials in this application, the molar content of Li refers to the initial state of the material, i.e., the state before feeding. When the positive electrode active material is applied to the battery system, the molar content of Li may change after charge-discharge cycles.

[0409] In the examples of positive electrode active materials in this application, the molar content of oxygen (O) is only a theoretical value. Oxygen release from the crystal lattice will cause the molar content of oxygen (O) to change. In reality, the molar content of oxygen (O) will fluctuate.

[0410] In this embodiment, the elemental content in the positive electrode active material is defined in a way known in the art and can be detected using equipment and methods known in the art. For example, referring to EPA 6010D-2014, it can be measured by inductively coupled plasma atomic emission spectrometry (ICP-OES, instrument model: Thermo ICAP7400). First, 0.4g of the positive electrode active material is weighed and 10ml (50% concentration) of aqua regia is added. Then, it is placed on a plate at 180℃ for 30min. After digestion on the plate, the volume is adjusted to 100mL, and quantitative testing is performed using the standard curve method.

[0411] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, a positive electrode film layer may or may not be provided on the surface of the foamed metal. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0412] In some embodiments, the positive electrode film layer may optionally include a positive electrode conductive agent. This application embodiment does not particularly limit the type of positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one selected from 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%.

[0413] In some embodiments, the positive electrode film layer may optionally include a positive electrode binder. This application embodiment does not impose any particular limitation on the type of positive electrode binder. As an example, the positive electrode binder may include at least one selected from polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), PVDF-tetrafluoroethylene-propylene terpolymer, PVDF-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resins. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5 wt%.

[0414] The positive electrode film is typically formed by coating a positive electrode slurry onto a positive electrode current collector, followed by drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder, and any other components in a solvent and stirring until homogeneous. The solvent can be N-methylpyrrolidone (NMP), but is not limited to it.

[0415] 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, the negative electrode film layer including a negative electrode active material.

[0416] As an example, the negative electrode current collector has two surfaces opposite each other in its own 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.

[0417] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0418] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 30. As an example, the negative electrode active material may include at least one of the following materials: carbon materials (e.g., carbon materials include at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode films in batteries may also be used. These negative electrode films may be used alone or in combination of two or more.

[0419] In some embodiments, the negative electrode active material includes silicon, which may exist in the form of a silicon-based material, such as elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The introduction of silicon can improve the energy density of the cell 30.

[0420] In some embodiments, the mass content of silicon in the negative electrode film layer is from 1 wt% to 32 wt%, optionally from 2 wt% to 19 wt%, and further optionally from 6 wt% to 13 wt%. In the cell 30 system, when the mass content of silicon is within the above range, the energy density of the cell 30 can be improved.

[0421] In the embodiments of this application, the mass content of silicon in the negative electrode film layer has a meaning known in the art and can be detected using equipment and methods known in the art. For example, the negative electrode sheet can be immersed in a solvent such as water to separate the negative electrode active material from the negative electrode current collector, and the negative electrode active material can be obtained by filtration. The silicon content of the negative electrode active material can be obtained by using an ICAP7400 inductively coupled plasma atomic emission spectrometer from Thermo Fisher Scientific, USA, in accordance with the GB / T30902-2014 standard.

[0422] In some embodiments, the negative electrode film layer may optionally include a negative electrode conductive agent. This application embodiment does not particularly limit the type of negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one selected from 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%.

[0423] In some embodiments, the negative electrode film layer may optionally include a negative electrode binder. This application embodiment does not impose any particular limitation on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, waterborne 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 mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0424] In some embodiments, the negative electrode film may optionally include other additives. As an example, other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of other additives in the negative electrode film is ≤2 wt%.

[0425] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0426] In some embodiments, the separator includes a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0427] This application does not impose any particular restrictions on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0428] In some embodiments, the material of the separator may include one or more of glass fiber, nonwoven 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.

[0429] In some embodiments, the separator may include a porous base membrane and a coating disposed on at least one side of the porous base membrane, the coating including at least one of inorganic particles or organic particles.

[0430] Porous base membranes may include one or more of polyethylene and polypropylene.

[0431] Inorganic particles possess good heat resistance, which can improve the overall heat resistance of the separator. Within the operating voltage range of sodium-ion batteries, inorganic particles essentially do not undergo oxidation and reduction reactions with metal dendrites. In other words, inorganic particles are configured to prevent oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of sodium-ion batteries.

[0432] 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.

[0433] 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, polyarylamide, polyamide-imide, polyimide, copolymers of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0434] In some embodiments, the cell 30 further includes an electrolyte.

[0435] During the charging and discharging process of the battery cell, active ions repeatedly insert and extract between the positive and negative electrode plates, while the electrolyte acts as a conductor for these active ions. This application does not impose any particular restrictions on the type of electrolyte; it can be selected according to actual needs.

[0436] Electrolytes consist of electrolyte salts and solvents. The types of electrolyte salts and solvents are not specifically limited and can be selected according to actual needs.

[0437] 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, and additives that can improve certain battery performance, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and additives that improve battery low-temperature power performance.

[0438] For example, the additives include at least one of the following: cyclic carbonate compounds containing unsaturated bonds, sulfate compounds, sulfite compounds, sulfonyl lactone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphonitrile compounds, acid anhydrides, cyclic acid anhydride compounds, phosphite compounds, phosphate compounds, borate esters, and carboxylic acid esters.

[0439] It is understandable that when cell 30 is a lithium iron phosphate cell, 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 may 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 may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0440] For example, when cell 30 is a lithium iron phosphate cell, the positive electrode active material is LFP (which can refer to 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, meaning that the total weight of the positive electrode active material is divided into 100 parts, with LFP accounting for 96 parts, PVDF accounting for 2 parts, and conductive carbon black also accounting for 2 parts. The weight unit of the positive electrode active material can be grams.

[0441] When cell 30 is a ternary lithium-ion cell, in the positive electrode material of cell 30, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2 to 3 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 2 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, etc.). The ternary lithium-ion cell can be, but is not limited to, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, etc.

[0442] For example, the ternary material of the ternary battery cell can be octet LiNi. 0.8 Co 0.1 Mn 0.1The weight ratio of O2, positive electrode active material, binder, and conductive agent is 96:2.5:1.5, meaning the total weight of the positive electrode material is divided into 100 parts. (This refers to the octet LiNi...) 0.8 Co 0.1 Mn 0.1 The composition of O2 is 96 parts, the composition of adhesive is 2.5 parts, and the composition of conductive agent is 1.5 parts.

[0443] In the above technical solutions, when cell 30 is a lithium iron phosphate cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated within a limited electrode assembly. This is beneficial for increasing the capacity and energy density of the battery device 100, enabling the lithium iron phosphate cell to output higher power while maintaining a relatively small volume and weight, meeting the application scenarios with certain energy density requirements. Using the above-mentioned range for binder and conductive agent dosages can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When cell 30 is a ternary cell, due to the relatively complex structure and surface properties of ternary materials, using the above-mentioned proportions of positive electrode active material, binder, and conductive agent helps ensure good adhesion between 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. This helps reduce the risk of active material detachment and electrode pulverization during charging and discharging, extending the cycle life of the battery device 100.

[0444] Secondly, please refer to Figure 1 again. This application embodiment provides an electrical device, which includes the battery device 100 of any of the above embodiments. The battery device 100 is used to provide electrical energy.

[0445] The electrical device can be vehicle 1000, and the battery device 100 can be installed at the bottom of the vehicle body.

[0446] In the power device of the present application, at least two adjacent second sampling units 82 can collect parameters of two or more battery cells, so that the total number of sampling units (including the first sampling unit 81 and the second sampling unit 82) can be reduced accordingly, and the connecting harness 70 can be shortened and simplified, making the structure of the battery device 100 more compact, saving space, thereby helping to improve the energy density of the battery device 100, and also reducing costs to a certain extent.

[0447] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, wherein, include: A battery cell assembly includes multiple battery cells connected in series. A sampling assembly includes multiple sampling units, connecting harnesses, and an output port. Each sampling unit is electrically connected to at least one connecting harness, and all connecting harnesses are connected to the output port. The multiple sampling units include a first sampling unit and a second sampling unit. Both the first and second sampling units have sampling points that can be electrically connected to a series path of battery cells. There are two first sampling units, which are electrically connected to the first and last battery cells of the multiple battery cells connected in series, respectively. Furthermore, in the series path of the multiple battery cells, the number of battery cells between at least two adjacent sampling points of the second sampling unit is greater than or equal to two.

2. The battery device according to claim 1 or 2, wherein, In the series path of the multiple battery cells, the number of battery cells between any two adjacent sampling points of the second sampling section is equal and greater than or equal to two.

3. The battery device according to claim 1, wherein, In the series path of the multiple cells, there are one or more cells between the sampling point of the first sampling unit and the sampling point of the adjacent second sampling unit.

4. The battery device according to any one of claims 1-3, wherein, Multiple battery cells are arranged in a battery pack along a first direction. The battery pack includes at least one battery pack. The sampling points of the two first sampling units are located on both sides of the battery pack along a second direction. The sampling points of the second sampling units are distributed on the same side or different sides of the battery pack in the second direction. The second direction forms an angle with the first direction.

5. The battery device according to claim 4, wherein, The number of battery packs is multiple, and the multiple battery packs are arranged along a second direction and / or a third direction. The sampling points of the second sampling unit are distributed on at least one side of one of the battery packs along its own arrangement direction, and the first direction, the second direction and the third direction form an angle between each other.

6. The battery device according to claim 5, wherein, The number of battery packs is two, and the two battery packs are arranged along the second direction. The sampling points of the second sampling unit are distributed between the two battery packs.

7. The battery device according to claim 5, wherein, The number of battery packs is two, and the two battery packs are arranged along the second direction. The sampling points of the second sampling unit are distributed on both sides of one of the battery packs along the second direction.

8. The battery device according to any one of claims 1-7, wherein, The connecting harness is at least one of a flexible circuit board and a wire harness.

9. The battery device according to any one of claims 1-8, wherein, The battery device includes a battery monitoring unit, and 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 section, and the second end is electrically connected to the battery monitoring unit.

10. The battery device according to claim 9, wherein, The second end is connected to the battery monitoring unit by welding.

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

12. The battery device according to claim 11, wherein, The battery device includes an electrical connector, a first adapter wire, and a second adapter wire. Both the first adapter wire and the second adapter wire are connected to the electrical connector. The second ends of the plurality of conductive elements are connected to the electrical connector through corresponding first adapter wires. 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 any one of claims 9-12, wherein, Multiple battery cells are arranged in a battery pack along a first direction, and the number of battery packs is at least two groups. At least two groups of battery packs are arranged along a second direction. The battery monitoring unit is located on one side of all the battery packs or in the middle of two adjacent battery packs along the second direction. The first direction and the second direction are arranged at an angle.

14. The battery device according to claim 13, wherein, The battery cell includes a housing and a conductive portion. The conductive portion is disposed at the end of the housing along a second direction. The conductive portions of two adjacent batteries along the second direction are connected. The first end is connected to a portion of the conductive portion to form the sampling portion.

15. The battery device according to claim 14, wherein, The first end is welded or bonded to the conductive part.

16. The battery device according to claim 13 or 14, wherein, The housing has a corner space at a corner along a third direction, and 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 any one of claims 14-16, wherein, The conductive parts of the multiple cells of the battery cell group located on the same side are arranged sequentially along the first direction, and along the third direction, the multiple conductive parts form a receiving gap with the end of the battery cell group, and the battery monitoring unit is disposed in the receiving gap.

18. The battery device according to claim 17, wherein, The battery device includes an electrical connector disposed in the receiving gap and located between the conductive part and the battery monitoring unit, the electrical connector electrically connecting the battery monitoring unit and the conductive part.

19. The battery device according to any one of claims 9-17, wherein, The battery device includes a main control board, and the battery monitoring unit is electrically connected to the main control board.

20. The battery device according to any one of claims 17-19, wherein, The battery device includes a housing, the housing includes a base plate, and the accommodating gap is located between the base plate and the conductive part.

21. The battery device according to claim 20, wherein, The battery device includes a bracket connected to the housing, and the battery monitoring unit is mounted on the bracket.

22. The battery device according to claim 20, wherein, The battery monitoring unit is bonded to the wall of the enclosure.

23. The battery device according to any one of claims 17-22, wherein, The length of the battery monitoring unit extends along a first direction.

24. The battery device according to any one of claims 14-23, wherein, The housing is made of a soft outer packaging material. In the first direction, a reinforcing partition is sandwiched between at least two adjacent cells. The reinforcing partition is connected to the housing, and the hardness of the reinforcing partition is greater than that of the housing.

25. The battery device according to claim 24, wherein, The thickness of the reinforcing partition is less than the thickness of the battery cell.

26. The battery device according to claim 24 or 25, wherein, The reinforcing partition is a metal plate.

27. The battery device according to any one of claims 24-26, wherein, The reinforcing partition is a heat-conducting component and is thermally connected to the shell.

28. The battery device according to any one of claims 24-27, wherein, The reinforcing partition is a solid structure.

29. The battery device according to any one of claims 24-27, wherein, The reinforcing partition has a cavity formed inside.

30. The battery device according to claim 29, wherein, The cavity includes heat exchange channels for the flow of the heat exchange medium.

31. The battery device according to any one of claims 24-30, wherein, The reinforcing partition includes a connecting portion that protrudes from the housing along the second direction, the connecting portion being located on the side of the conductive portion away from the battery monitoring unit.

32. The battery device according to any one of claims 24-31, wherein, In the first direction, two adjacent reinforcing partitions are connected by a connecting plate, and the battery cell is housed within the space enclosed by the connecting plate and the two reinforcing partitions.

33. The battery device according to claim 32, wherein, The two adjacent reinforcing partitions in the first direction are formed into an integral structure with the connecting plate to which they are connected.

34. The battery device according to any one of claims 14-33, wherein, The conductive parts of two adjacent battery cells are directly connected.

35. The battery device according to claim 34, wherein, The conductive parts of two adjacent battery cells are welded together.

36. The battery device according to claim 34, wherein, The conductive parts of two adjacent battery cells are directly connected by conductive adhesive.

37. The battery device according to any one of claims 14-36, wherein, Multiple battery cells are sequentially bonded together along the first direction, each battery cell having a first surface and a second surface, the second surface being adjacent to the first surface; The battery device includes a housing, an adhesive layer, and a blocking member. The adhesive layer is disposed on one side of the cell assembly located on the first surface and is used to bond multiple cells to the housing. The blocking member is located at least between at least one cell at both ends of the cell assembly in the first direction and the adhesive layer, and is used to prevent the adhesive layer from overflowing from the first surface of the cell to the second surface of the corresponding cell.

38. The battery device according to claim 37, wherein, The blocking element at least covers the corner position corresponding to the battery cell.

39. The battery device according to claim 37, wherein, The blocking element at least covers the edge position corresponding to the battery cell located in the first direction.

40. The battery device according to claim 37, wherein, A blocking element is provided between two adjacent cells along the first direction.

41. The battery device according to claims 1-41, wherein, The battery cell is any one of lithium iron phosphate battery cells, ternary battery cells, and solid-state battery cells.

42. The battery device according to any one of claims 1-41, wherein, The battery cell is a lithium iron phosphate battery cell, and the ratio of the positive electrode active material, binder and conductive agent in the positive electrode material of the battery cell is 96:(1-3):(1-3); the battery cell is a ternary battery cell, and the ratio of the positive electrode active material, binder and conductive agent in the positive electrode material of the battery cell is 96:(2-3):(1-2).

43. An electrical appliance, wherein, Includes the battery device according to any one of claims 1-42, the battery device being used to provide electrical energy.

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