Battery device, electric device and manudacturing method for battery device

Abstract

A battery device, an electric device, and a manufacturing method for the battery device, belonging to the technical field of batteries. The battery device comprises a plurality of battery cell groups, wherein the plurality of battery cell groups are stacked in a first direction, and each battery cell group comprises at least one pouch battery cell. Each battery cell group located between two ends in a first direction has one end in a second direction electrically connected to the battery cell group upstream in the first direction, and the other end in the second direction electrically connected to the battery cell group downstream in the first direction. The connection area between every two battery cell groups connected to each other forms a flexible bent conductive structure. The first direction and the second direction are arranged at an included angle.

Description

Battery devices, electrical devices, and methods for manufacturing battery devices Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, an electrical device, and a method for processing the battery device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. Some power batteries use pouch cells; however, the production efficiency of this type of power battery is relatively low. Summary of the Invention

[0003] This application provides a battery device, an electrical device, and a method for processing the battery device, which helps to improve the production efficiency of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, which includes multiple cell groups stacked along a first direction, and each cell group includes at least one pouch cell; one end of each cell group located between the two ends of the first direction is electrically connected to a cell group upstream of the first direction along a second direction, and the other end of the cell group along the second direction is electrically connected to a cell group downstream of the first direction; wherein the connection position of two interconnected cell groups forms a flexible bent conductive structure, and the first direction and the second direction are arranged at an angle.

[0005] In the above technical solution, by connecting each pair of adjacent cell groups together and bending the connection point to achieve stacking of adjacent cell groups along the first direction, and then electrically connecting one end of the cell group along the second direction to the cell group upstream along the first direction, and electrically connecting the other end of the cell group along the second direction to the cell group downstream along the first direction, the packing efficiency and production efficiency of the battery device can be effectively improved. Furthermore, since the connection of adjacent cell groups does not require conductive supports, the operating space during connection is larger, reducing the difficulty of connection operations. Connection quality is also easier to inspect, and connection positions are easier to repair, thus improving the reliability of the battery device. Moreover, by eliminating conductive supports and reducing the number of components, the weight and cost of the battery device are reduced, and the space occupied by the conductive supports is saved, which is beneficial to improving the energy density of the battery device.

[0006] In some embodiments, the thickness direction of the pouch cell is a first direction, and the cell assembly includes a pouch cell or a plurality of pouch cells laid flat on a plane perpendicular to the first direction.

[0007] In the above technical solution, the total thickness of the multiple cell groups stacked along the first direction is small, occupying little space. Furthermore, the flexible bending conductive structure bends along the thickness direction of the pouch cell, requiring a short length, making it less prone to breakage and ensuring reliable conductivity. In addition, when the cell group includes multiple pouch cells laid flat on a plane perpendicular to the first direction, a bending process is not required at the connection points of the multiple pouch cells, thereby improving the grouping efficiency.

[0008] In some embodiments, multiple pouch cells laid flat in the cell assembly are arranged along a second direction, and adjacent pouch cells are connected at adjacent positions.

[0009] The above technical solutions enable rapid assembly and improve production efficiency.

[0010] In some embodiments, the battery device includes a first cell array, the first cell array including a plurality of cell groups stacked along a first direction, each cell group in the first cell array including one pouch cell.

[0011] In the above technical solution, by setting the number of pouch cells in each cell group of the first cell row to one, the structure of the first cell row is simple and the grouping efficiency is high. Furthermore, it increases the operating space when connecting adjacent cell groups, reduces the difficulty of connecting adjacent cell groups, and makes it easier to detect connection quality and repair connection positions, thereby improving the production capacity and reliability of the battery device.

[0012] In some embodiments, the first direction is the thickness direction of the pouch cell, the second direction is the length direction of the pouch cell, and the ends of two adjacent pouch cells on the same side are connected by a flexible bending conductive structure.

[0013] In the above technical solution, by setting the first direction as the thickness direction of the pouch cell and the second direction as the length direction of the pouch cell, the ends of two adjacent pouch cells on the same side in the length direction are connected by a flexible bending conductive structure, and the two adjacent pouch cells are stacked along the thickness direction. Thus, both the connection of two adjacent pouch cells and the bending of the flexible bending conductive structure are very convenient, reducing the processing difficulty of the first cell array and shortening the length of the flexible bending conductive structure, thereby saving costs.

[0014] In some embodiments, each pouch cell in the first cell array has the same length and the same width.

[0015] In the above technical solution, the specifications of multiple pouch cells can be almost identical, which is beneficial for the processing of pouch cells. Furthermore, when arranging them, there is no need to consider the differences in the shape of different pouch cells affecting the arrangement, thereby improving production efficiency. In addition, it facilitates the alignment of the two edges along the width and length directions of every two adjacent pouch cells in the first cell row. The total space occupied by all the pouch cells in the first cell row along the length direction is the same as that occupied by a single pouch cell in the length direction, and the total space occupied by all the pouch cells in the first cell row along the width direction is the same as that occupied by a single pouch cell in the width direction. This significantly reduces the overall space occupied by the first cell row along the length and width directions of the pouch cells, which is beneficial for improving the energy density of the battery device.

[0016] In some embodiments, the battery device includes a plurality of first cell arrays arranged along a second direction.

[0017] In the above technical solution, when the overall spatial dimension of the battery device along the second direction is large, by setting the second direction as the length direction of the pouch cell and the battery device including multiple first cell rows arranged along the second direction, the length of a single pouch cell can be reduced, the processing difficulty of a single pouch cell can be reduced, and the structural strength and structural stability of a single pouch cell can be improved.

[0018] In some embodiments, two first cell rows arranged adjacent to each other along a second direction are connected by an inter-row conductive structure.

[0019] In the above technical solution, by setting two first cell rows that are adjacent to each other along the second direction and connecting them through an inter-row conductive structure, the first cell rows that are adjacent to each other along the second direction can be connected in series or in parallel. On the one hand, this simplifies the electrode output of multiple first cell rows, and on the other hand, it meets the power parameter design requirements of the battery device.

[0020] In some embodiments, in two first cell rows arranged adjacent to each other in the second direction, the adjacent ends of two cell groups located at the ends in the first direction and opposite to each other in the second direction are connected by an inter-row conductive structure.

[0021] In the above technical solution, the inter-row conductive structure can be located at one end along the first direction between the two first cell rows it connects to, thereby shortening the length of the inter-row conductive structure, reducing costs, saving the space occupied by the inter-row conductive structure in the battery device, and improving the energy density of the battery device.

[0022] In some embodiments, the battery device includes a second cell array, the second cell array including a plurality of cell groups stacked along a first direction, wherein at least one cell group in the second cell array includes a plurality of pouch cells.

[0023] In the above technical solution, by setting the number of soft-pack cells included in at least one cell group in the second cell bar to be multiple, the number of flexible bending conductive structures can be reduced, thereby reducing the number of times the conductive structures are bent, and thus improving the grouping efficiency of the second cell bar.

[0024] In some embodiments, the first direction is the thickness direction of the pouch cell, and all the pouch cells in a cell group including multiple pouch cells are laid flat on a plane perpendicular to the first direction.

[0025] In the above technical solution, the connection between multiple pouch cells in the cell assembly does not require a bending process, thereby improving the assembly efficiency.

[0026] In some embodiments, the second direction is the length direction of the pouch cell, and the multiple pouch cells included in the cell group in the second cell row are arranged along the second direction. The adjacent ends of two adjacent pouch cells are connected by a conductive structure. The conductive structure located at the end of the cell group along the second direction is a flexible structure and is bent to form a flexible bent conductive structure.

[0027] In the above technical solution, by setting the first direction as the thickness direction of the pouch cell and the second direction as the length direction of the pouch cell, the multiple pouch cells included in the cell group in the second cell row are arranged along the second direction, and the adjacent ends of two adjacent pouch cells are connected by a conductive structure. The conductive structure located at the end of the cell group along the second direction is a flexible structure and is bent to form a flexible bent conductive structure, thereby improving the grouping efficiency of the second cell row, shortening the length of the conductive structure and the flexible bent conductive structure, and saving costs.

[0028] In some embodiments, the total length of each cell group in the second cell bank is consistent along the second direction.

[0029] Therefore, the space occupied by all the cells in the second cell array along the second direction is the same as the space occupied by a single cell array along the second direction, which can reduce the space occupied in the second direction and help improve the energy density of the battery device.

[0030] In some embodiments, each cell group in the second cell array includes pouch cells that are identical in shape, arrangement, and number.

[0031] In the above technical solution, multiple cell groups appear identical, facilitating mass production. Furthermore, the arrangement is unaffected by differences in the shapes of different pouch cells, improving production efficiency. When selecting conductive structures for bending, grouping equal numbers of pouch cells avoids miscounting. Additionally, it facilitates overlapping projections along the first direction after stacking. The resulting second cell row, formed by stacking multiple cell groups along the first direction, occupies the same space perpendicular to the first direction as a single cell group within the row, reducing the overall space occupied by the second cell row and increasing the battery's energy density. Moreover, it ensures consistent specifications for each flexible bending conductive structure within the second cell row, avoiding variations in length, which simplifies processing, facilitates mass production, and makes the overall conductivity of the battery easier to control.

[0032] In some embodiments, the second direction is the length direction of the pouch cell, and electrode terminals extend from both ends of the pouch cell in the length direction. Adjacent pouch cells are connected through adjacent electrode terminals, and the cell group includes one pouch cell or includes multiple pouch cells arranged sequentially along the second direction.

[0033] In the above technical solution, by setting the electrode terminals to extend from both ends along the length of the pouch cell, the processing difficulty of the pouch cell is reduced. Furthermore, by setting the second direction as the length direction of the pouch cell, it is beneficial to achieve electrical connection between one end of each cell group located between the two ends of the first direction and the cell group upstream along the first direction via a flexible bending conductive structure, and the other end along the second direction and the cell group downstream along the first direction via a flexible bending conductive structure. For example, during processing, multiple pouch cells can be arranged in a row along the length direction of the pouch cell, and each pair of adjacent electrode terminals can be connected to obtain a conductive structure. Then, the conductive structure can be bent, allowing multiple pouch cells to be divided into multiple cell groups, and these cell groups can be stacked along the thickness direction of the pouch cell. This simplifies processing, improves grouping efficiency, and shortens the length of the flexible bending conductive structure. Moreover, the bent conductive structure only occupies the space on both sides of the length direction of the pouch cell, and does not occupy the space on both sides of the width direction of the pouch cell. When the width direction of the pouch cell is arranged according to the height direction, the space occupied by the battery device in the height direction can be reduced.

[0034] In some embodiments, the first direction is the thickness direction of the pouch cell, the width direction of the pouch cell is the third direction, and the projections of two cell groups stacked and adjacent to each other along the first direction coincide.

[0035] In the above technical solution, since the first direction is the thickness direction of the soft-pack cell, it is beneficial to reduce the space occupied by multiple cell groups in the first direction after stacking along the first direction. Moreover, the overall space occupied by the cell row formed by stacking multiple cell groups in the first direction is the same as the space occupied by a single cell group in the cell row in the first direction, thereby reducing the overall space occupied by the cell row in the first direction and improving the energy density of the battery device.

[0036] In some embodiments, the pouch cell includes a pouch shell and electrode terminals. The electrode terminals are connected to an electrode assembly inside the pouch shell and include leads extending out of the pouch shell. Leads adjacent to each other in the pouch shell are directly or indirectly connected to form a conductive structure. The conductive structure at the end of the cell assembly along the second direction is a flexible structure and is bent to form a flexible bent conductive structure.

[0037] In the above technical solution, by connecting the adjacent electrode terminals of two adjacent soft-pack cells to form a conductive structure, and setting the conductive structure at the end of the cell assembly along the second direction as a flexible structure and bending it to form a flexible bent conductive structure, it is beneficial to process the conductive structure and the flexible bent conductive structure, and it is also beneficial to shorten the length of the electrode terminals, the conductive structure and the flexible bent conductive structure, thus saving production costs.

[0038] In some embodiments, the leads from two pouch cells in the flexible bending conductive structure are overlapped.

[0039] In the above technical solution, two adjacent cell groups can be connected by directly overlapping the leads of the pouch cells. This allows the two cell groups to have a larger connection area, making the connection between the two cell groups more stable and reliable. Moreover, compared with indirect connection, direct connection can simplify the structure, reduce the number of parts, improve assembly efficiency, further improve grouping efficiency, and increase production capacity.

[0040] In some embodiments, the two leads constituting the lap joint are connected at the lap joint by welding or conductive adhesive.

[0041] The above technical solution is not only easy to operate, but also enables a relatively stable and reliable electrical connection.

[0042] In some embodiments, the overlapping connection position of the two leads in the flexible bending conductive structure is offset from the bending position of the flexible bending conductive structure.

[0043] In the above technical solution, on the one hand, the flexible bending conductive structure can be bent relatively easily, and the bending does not adversely affect the reliability and stability of the overlapping connection between the leads, thereby improving the connection reliability and electrical connection stability between the battery cells.

[0044] In some embodiments, the bending position of the flexible bending conductive structure is centered, and the overlapping connection position of the two leads in the flexible bending conductive structure is located on one side of the bending position in the first direction and is opposite to the corresponding battery cell group in the second direction.

[0045] In the above technical solution, by setting the distance from the bending position of the flexible bending conductive structure to each cell group to be equal along the extension direction of the flexible bending conductive structure, it is beneficial to improve the structural stability of the flexible bending conductive structure and reduce the stress concentration of the flexible bending conductive structure.

[0046] In some embodiments, the two leads forming an overlapping connection in the flexible bent conductive structure are a first lead and a second lead, respectively. The battery cell group extending out of the first lead is the first battery cell group, and the battery cell group extending out of the second lead is the second battery cell group. The first battery cell group and the second battery cell group are stacked adjacent to each other. The length of the first lead is greater than the length of the second lead. The first lead includes an extension section, a bending section, and an overlapping section. The extension section is opposite to the first battery cell group along a second direction. The overlapping section is spaced apart from the extension section along a first direction. The overlapping section is opposite to the second battery cell group along a second direction. The bending section is bent and its two ends are respectively connected to the extension section and the overlapping section. The second lead is opposite to the second battery cell group along a second direction and overlaps with the overlapping section.

[0047] In the above technical solution, it is relatively easy to achieve that the overlapping connection position of the two leads in the flexible bending conductive structure is staggered from the bending position of the flexible bending conductive structure, and the bending is relatively easy.

[0048] In some embodiments, the second direction is the length direction of the pouch cell, and each pouch cell has a first lead-out portion and a second lead-out portion at both ends in the length direction.

[0049] In the above technical solution, by setting the two leads of each soft-pack battery cell along the length direction to be one long and one short, the connection of each two adjacent soft-pack battery cells can be connected by the lead of one long and one short. This makes it easier to achieve that the overlapping connection position of the two leads in the flexible bending conductive structure is staggered from the bending position of the flexible bending conductive structure.

[0050] In some embodiments, the two leads forming an overlapping connection in the flexible bending conductive structure are of the same length, and the bending position of the flexible bending conductive structure is located at the point where the two leads overlap without connection.

[0051] In the above technical solution, when producing pouch cells, the two leads at both ends of the pouch cell can be cut to equal lengths. When arranging multiple pouch cells, there is no need to choose the placement direction due to the different lengths of the leads, thereby improving production efficiency.

[0052] In some embodiments, the leads from two pouch cells in the flexible bending conductive structure are indirectly connected via an adapter plate.

[0053] In the above technical solution, by setting an adapter plate to connect the lead-out parts of two pouch cells, the length of the lead-out parts can be shortened, reducing the processing difficulty of the pouch cells. Furthermore, standardized adapter plates can be used for rapid and efficient connection processing, making it convenient and efficient to connect multiple pouch cells, and ensuring good consistency in the conductivity of each flexible bending conductive structure.

[0054] In some embodiments, the adapter piece overlaps with the lead-out portion.

[0055] In the above technical solution, by setting the adapter piece to overlap with the lead-out part, the adapter piece and the lead-out part can have a larger connection area, thereby making the connection and fixation of the two battery cell groups more stable and reliable.

[0056] In some embodiments, the overlapping connection position of the adapter piece and the lead-out portion is offset from the bending position of the flexible bent conductive structure.

[0057] In the above technical solution, the flexible bending conductive structure does not bend at the overlapping connection between the adapter piece and the lead-out part. This allows the flexible bending conductive structure to bend more easily, and the bending does not adversely affect the reliability and stability of the overlapping connection between the adapter piece and the lead-out part, thereby improving the connection reliability and electrical connection stability between the battery cells.

[0058] In some embodiments, the flexible bending conductive structure is bent at the adapter piece, and the bending position of the flexible bending conductive structure is centered.

[0059] The above technical solution helps to improve the structural stability of the flexible bending conductive structure and reduce stress concentration. Furthermore, the adapter piece can be relatively long, with one part used to overlap with the lead-out section and the remainder used for bending, thereby simplifying the design of the lead-out section and further shortening its length.

[0060] In some embodiments, the bending position of the flexible bending conductive structure is offset from the connection conductive position of the two battery cell groups in the flexible bending conductive structure.

[0061] In the above technical solution, by setting the bending position of the flexible bending conductive structure to be staggered from the connection conductive position of the two battery cell groups in the flexible bending conductive structure, the flexible bending conductive structure can be bent more easily, and the bending does not adversely affect the connection reliability and stability of the two battery cell groups in the flexible bending conductive structure, thereby improving the connection reliability and electrical connection stability between the battery cell groups.

[0062] In some embodiments, the bends of the flexible conductive structure are rounded.

[0063] In the above technical solution, by setting the bending corner of the flexible bending conductive structure to a rounded corner, the stress concentration problem at the bending position can be reduced, and the connection reliability and conductivity stability of two adjacent battery cells can be improved.

[0064] In some embodiments, the flexible bending conductive structure is shaped like a triangle or a triangle.

[0065] In the above technical solution, the flexible bending conductive structure can save space and is easy to process, thereby reducing the processing difficulty.

[0066] In some embodiments, the battery cell assembly has a first edge and a second edge on its two sides in the third direction, respectively. The flexible bending conductive structure is disposed in the third direction relative to the second edge and close to the first edge, so as to form a first reserved space on the side of the flexible bending conductive structure close to the second edge. The first direction, the second direction and the third direction are perpendicular to each other.

[0067] In the above technical solution, the first reserved space can be used to accommodate other components, making full use of the space in the third-party upward direction where the battery device is set with a flexible bending conductive structure, so as to reduce the occupation of other spaces and thus help improve the energy density of the battery device.

[0068] In some embodiments, the flexible bending conductive structure is located on the side of the cell assembly near the first edge of the centerline in the third direction.

[0069] In the above technical solution, the size of the first reserved space along the third direction can exceed half of the size of the cell assembly along the third direction, thereby enabling the first reserved space to accommodate more components and make fuller use of the space in the third direction where the flexible bending conductive structure of the battery device is set, so as to reduce the occupation of other spaces and thus help improve the energy density of the battery device.

[0070] In some embodiments, the battery device includes a housing for loading pouch cells, with a reinforcing separator sandwiched between at least two adjacent cell groups along a first direction. The stiffness of the reinforcing separator is greater than the stiffness of the pouch casing of the pouch cells. The reinforcing separator has a connecting portion protruding from the cell group along a second direction, the connecting portion extending into a first reserved space and connecting to the housing.

[0071] In the above technical solution, the stiffness of the reinforcing separator is greater than that of the soft-pack outer shell, which allows the reinforcing separator to improve the deformation problem of the soft-pack cells. Furthermore, by strengthening the connection between the separator and the housing, the reinforcing separator can more reliably and stably support the cell assembly, improving the stability of the battery device. Moreover, since the reinforcing separator is connected to the housing through a connection extending into the first reserved space, it reduces the occupation of other spaces, effectively utilizing the space saved along the third direction by the flexible bending conductive structure, thereby contributing to an increase in the energy density of the battery device.

[0072] In some embodiments, the enclosure includes an enclosure body and a mounting bracket. The mounting bracket is installed inside the enclosure body and is located on one side of the battery cell assembly in the second direction. The connecting portion is connected to the mounting bracket.

[0073] In the above technical solution, by setting a mounting bracket inside the housing body and connecting the reinforcing partition to the housing through the mounting bracket, the difficulty of connecting the reinforcing partition to the housing can be reduced, and flexible installation of the reinforcing partition to the housing can be achieved. Furthermore, by placing the mounting bracket on one side of the cell assembly in the second direction, the connecting portion of the reinforcing partition protruding from the cell assembly in the second direction can easily approach the mounting bracket and form a connection with it.

[0074] In some embodiments, the edge of the connecting portion on the side closer to the second edge in the third direction is the first edge, and the edge of the mounting bracket on the side closer to the second edge in the third direction is the second edge. Both the first edge and the second edge are located on the side of the second edge closer to the first edge, so that the connecting portion and the mounting bracket form a second reserved space on the side of the connecting portion and the mounting bracket away from the first edge in the third direction.

[0075] In the above technical solution, by forming a second reserved space on the side away from the first edge in the third direction of the connecting part and the mounting bracket, other components of the battery device can be arranged in the second reserved space, such as wiring, thereby reducing the space occupied in other locations and improving the compactness and energy density of the battery device.

[0076] In some embodiments, one of the length direction and the width direction of the enclosure is a first direction, the other is a second direction, the height direction of the enclosure is a third direction, and multiple mounting brackets arranged along the first direction are respectively provided at both ends of the enclosure body in the second direction.

[0077] In the above technical solution, by setting multiple mounting brackets, it is convenient to flexibly connect with multiple reinforcing partitions arranged along the first direction, reducing the difficulty of connecting the reinforcing partitions and the mounting brackets. Moreover, by placing the mounting brackets at both ends of the enclosure body in the second direction, the difficulty of connecting the mounting brackets and the enclosure body can be reduced.

[0078] In some embodiments, the thickness direction of the pouch cell is a first direction, and the cell assembly includes a pouch cell or a plurality of pouch cells laid flat on a plane perpendicular to the first direction. A reinforcing partition is sandwiched between at least two cell assemblies adjacent to each other along the first direction. The thickness direction of the reinforcing partition is the first direction, the stiffness of the reinforcing partition is greater than the stiffness of the pouch shell of the pouch cell, the thickness of the reinforcing partition is less than the thickness of the cell assembly, and the reinforcing partition is configured to be able to exchange heat with the electrode assembly inside the pouch cell through the pouch shell in contact with it.

[0079] In the above technical solution, the heat transfer properties of the reinforcing separator can be utilized, allowing it to also dissipate heat and equalize the temperature of the pouch cells, thus optimizing their performance and lifespan. Furthermore, by placing the reinforcing separator between adjacent pouch cells, heat transfer between adjacent cells on either side of the separator can be reduced, thereby improving the overall reliability of the battery device. In addition, since the thickness of the reinforcing separator is less than the thickness of the cell assembly, its placement does not occupy excessive space, thus contributing to increased energy density of the battery device.

[0080] In some embodiments, the reinforcing separator covers more than 80% of the total area of ​​all pouch cells in the cell assembly.

[0081] In the above technical solution, by setting a reinforcing partition that covers more than % of the total area of ​​all soft-pack cells in the cell assembly, the cell assembly and the reinforcing partition can have a large heat transfer surface and support surface, so that the reinforcing partition can provide better support, heat transfer and separation for the cell assembly.

[0082] In some embodiments, multiple reinforcing partitions are sandwiched between multiple battery cell groups stacked along a first direction, and only one reinforcing partition is sandwiched between each pair of adjacent battery cell groups. Two reinforcing partitions arranged adjacent to each other along the first direction are connected by a connecting plate located on the side of the battery cell group in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0083] In the above technical solution, by setting two reinforcing partitions that are adjacent to each other along the first direction and connecting them through a connecting plate located on the third direction side of the cell assembly, the reliability of the reinforcing partitions supporting the soft-pack cell can be improved. Moreover, the setting position of the connecting plate does not interfere with the cell assembly, nor does it interfere with the flexible bending conductive structure located in the second direction.

[0084] In some embodiments, a buffer is sandwiched between at least two adjacent cell groups along a first direction, the stiffness of which is less than that of the soft-pack outer shell.

[0085] In the above technical solution, by setting a buffer between two adjacent battery cell groups, and the stiffness of the buffer is less than that of the soft-pack outer shell, the buffer can provide expansion space to the battery cell group, so that the buffer can effectively absorb the expansion deformation of the battery cell group and the vibration under external impact, etc., making the overall structural stability of the battery device better.

[0086] In some embodiments, a buffer is sandwiched between at least two adjacent cell groups along a first direction, the stiffness of the buffer being less than that of the soft-pack shell, and a plurality of reinforcing partitions and a plurality of buffers are sandwiched between multiple cell groups stacked along the first direction, with each cell group sandwiched between the buffer and the reinforcing partition.

[0087] In the above technical solution, by setting each battery cell assembly between the buffer and the reinforcing partition, the arrangement of the reinforcing partition and the buffer is more balanced, and each battery cell assembly can obtain stable and reliable support, heat exchange and buffering effect.

[0088] In some embodiments, the pouch housing includes two membrane portions arranged and connected along the thickness direction of the pouch cell, each membrane portion defining a receiving groove. The receiving grooves of the two membrane portions open toward each other along the thickness direction of the pouch cell and together form a receiving cavity of the pouch housing. The electrode assembly of the pouch cell is disposed within the receiving cavity.

[0089] In the above technical solution, the soft-pack shell has a simple structure, is easy to process, and is conducive to increasing the volume of the soft-pack shell, thereby increasing the energy density of the soft-pack battery cell.

[0090] In some embodiments, the wall thickness of the membrane portion is less than or equal to 0.2 mm, the dimension of the pouch cell in the thickness direction of the pouch cell is a first dimension, the dimension of the membrane portion in the thickness direction of the pouch cell is a second dimension, the ratio of the second dimension to the first dimension is greater than or equal to 0.4 and less than or equal to 0.6, and the first dimension is greater than or equal to 5 mm and less than or equal to 70 mm.

[0091] In the above technical solution, the volume ratio of the soft-pack outer shell in the soft-pack battery cell is smaller and the weight is lighter, allowing the electrode assembly to account for a larger proportion of the volume and weight of the soft-pack battery cell, thereby significantly improving the energy density of the soft-pack battery cell. Furthermore, the soft-pack battery cell can have a larger thickness and higher energy density. In the same volume, compared to multiple thinner soft-pack battery cells, the number of soft-pack battery cells arranged in this embodiment is smaller, thus reducing the proportion of the soft-pack outer shell and allowing multiple soft-pack battery cells within the same volume to have a greater energy density. Moreover, it can reduce the number of structural components such as reinforcing separators and buffers in the battery device, increasing the arrangement space of the soft-pack battery cells in the battery device, thereby significantly improving the overall energy density of the battery device.

[0092] In some embodiments, the two membrane portions are separate components and have sealing structures around the perimeter of the pouch cell.

[0093] In the above technical solution, individual membrane sections are easy to process, which can reduce the processing difficulty.

[0094] In some embodiments, the two membrane portions are integral and have sealing structures on one long side and two wide sides around the pouch cell.

[0095] The above technical solution can reduce the number of sealing steps and reduce the overall size of the pouch cell in the width direction, thereby increasing the energy density. Moreover, compared with sealing all four sides, it can avoid leakage problems caused by poor sealing on the side where sealing is omitted, thus improving the reliability of the pouch cell.

[0096] In some embodiments, the battery device includes a cell array, the cell array including a plurality of cell groups stacked along a first direction, the battery device including a housing for loading the cell array, one of the length direction and the width direction of the housing being the first direction and the other being the second direction, the thickness direction of the pouch cell being the first direction, the second direction being the length direction of the pouch cell, the width direction of the pouch cell being consistent with the height direction of the housing, and the housing including cover plates disposed on both sides of the cell array along the height direction of the housing.

[0097] In the above technical solution, arranging the pouch cells as described above can improve the uniformity of the force on each pouch cell and facilitate heat dissipation.

[0098] In some embodiments, at least one cover plate exchanges heat with the battery cell.

[0099] In the above technical solution, by arranging the pouch cells as described above, each pouch cell can effectively exchange heat with the cover plate, improving the consistency and uniformity of temperature regulation for each pouch cell, thereby improving the working stability and reliability of the cell array, and ultimately enhancing the performance of the battery device.

[0100] In some embodiments, structural adhesive is used to fill the space between the cell array and the cover plate.

[0101] The above technical solution can improve the stiffness of the pouch cell along the height of the housing.

[0102] In some embodiments, the structural adhesive is a thermally conductive adhesive.

[0103] The above technical solution is beneficial for heat dissipation of the soft-pack battery cell.

[0104] In some embodiments, the housing is provided with a baffle strip, the cover plate includes a bottom plate located below the cell array, a mating gap is formed between the bottoms of two adjacent soft-pack cells arranged along a first direction, and the baffle strip is located between the mating gap and the bottom plate.

[0105] In the above technical solution, the adhesive-blocking strip can prevent the structural adhesive from overflowing between adjacent soft-pack cells, reducing the probability of adjacent soft-pack cells forming a rigid structure due to adhesive overflow. This can improve the problem of local stress concentration between adjacent soft-pack cells and reduce the risk of damage to the soft-pack cells.

[0106] In some embodiments, two adjacent pouch cells share a single rubber strip.

[0107] In the above technical solution, by having two adjacent soft-pack cells share a single adhesive strip, the number of adhesive strips required can be reduced, which is beneficial for improving assembly efficiency.

[0108] In some embodiments, the adhesive strip is adhesive foam and is bonded to the base plate; or, the adhesive strip is a strip with adhesive on one side and is bonded to the bottom of the soft-pack battery cell.

[0109] In the above technical solutions, the adhesive-blocking foam has good compressibility. By squeezing the adhesive-blocking strip with the soft-pack battery cell, it can better prevent the structural adhesive from overflowing between adjacent soft-pack battery cells and bond the adhesive-blocking strip to the base plate, which facilitates the installation and fixing of the adhesive-blocking strip. Alternatively, by setting the adhesive-blocking strip as a strip with adhesive on one side, it is easy to bond the adhesive-blocking strip to the bottom of the soft-pack battery cell, so that the adhesive-blocking strip and the soft-pack battery cell are fixed as a whole, thereby improving the overall assembly efficiency of the battery device.

[0110] In some embodiments, the battery device further includes a heat exchange plate disposed between the cell array and at least one cover plate.

[0111] In the above technical solution, the temperature regulation effect of the battery cell array can be optimized through the design of the heat exchange plate.

[0112] In some embodiments, the pouch cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0113] In the above technical solutions, the use of the aforementioned types of pouch cells provides more options for battery device design to meet different application needs. Specifically, pouch cells are lithium iron phosphate battery cells, which have advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; pouch cells are ternary lithium battery cells, which have advantages such as high energy density and good electrochemical performance; and pouch cells are solid-state battery cells, which have advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0114] In some embodiments, the pouch 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 pouch cell is 96:1-3:1-3; the pouch cell is a ternary lithium battery cell, and the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch cell is 96:2-3:1-2.

[0115] In the above technical solutions, when the pouch cell is a lithium iron phosphate battery 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, allowing the lithium iron phosphate battery 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 can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device. When the pouch cell is a ternary battery 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, and extends the cycle life of the battery device.

[0116] Secondly, embodiments of this application also provide an electrical device, including a battery device according to any of the above-described solutions.

[0117] In the above technical solution, the improved production efficiency of the battery device helps to reduce the manufacturing cost of the power-consuming device.

[0118] Thirdly, embodiments of this application also provide a method for processing a battery device, wherein the battery device includes a plurality of pouch cells, and electrode terminals extend from both ends of the pouch cells, wherein the extension direction of the electrode terminals is perpendicular to the thickness direction of the pouch cells. The processing method includes the steps of: connecting the plurality of pouch cells along the extension direction of the electrode terminals to form a cell string, dividing the cell string into a plurality of cell groups arranged sequentially along the arrangement direction of the plurality of pouch cells, each cell group including at least one pouch cell, and connecting every two adjacent pouch cells in the cell string through adjacent electrode terminals to form a conductive structure; bending the two conductive structures at both ends of each cell group in opposite directions, so that the two cell groups connected to the cell group are stacked on both sides of the thickness direction of the cell group.

[0119] In the above technical solutions, the cell array has high packing efficiency and the battery device has high processing efficiency.

[0120] In some embodiments, connecting multiple pouch cells into a string of cells along the extension direction of the electrode terminals specifically includes the steps of: laying multiple pouch cells in a row along the extension direction of the electrode terminals; and connecting the electrode terminals at adjacent positions of every two adjacent pouch cells.

[0121] In the above technical solution, each pair of adjacent soft-pack cells in a row can be connected simultaneously, thereby improving processing efficiency.

[0122] In some embodiments, connecting multiple pouch cells into a string of cells along the extension direction of the electrode terminals specifically includes the steps of: overlapping and welding the electrode terminals of adjacent positions of every two adjacent pouch cells.

[0123] In the above technical solutions, the cell busbar has high grouping efficiency and stable and reliable power supply. Attached Figure Description

[0124] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0125] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this application;

[0126] Figure 2 is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0127] Figure 3 is a schematic diagram of the battery device after the cover plate of the hidden housing is provided in some embodiments of this application;

[0128] Figure 4 is a stacking diagram of a battery cell assembly provided in an embodiment of this application;

[0129] Figure 5 is a stacking diagram of another battery cell assembly provided in an embodiment of this application;

[0130] Figure 6 is an enlarged view of part A circled in Figure 5;

[0131] Figure 7 is a schematic diagram of a battery cell busbar provided in an embodiment of this application;

[0132] Figure 8 is a schematic diagram of one processing state of the battery cell array shown in Figure 7;

[0133] Figure 9 is a schematic diagram of another processing state of the battery cell array shown in Figure 7;

[0134] Figure 10 is a schematic diagram of a pouch cell provided in an embodiment of this application;

[0135] Figure 11 is a schematic diagram of a battery device provided in an embodiment of this application;

[0136] Figure 12 is a schematic diagram of another battery cell array provided in an embodiment of this application;

[0137] Figure 13 is a schematic diagram of one processing state of the battery cell array shown in Figure 12;

[0138] Figure 14 is a schematic diagram of another battery device provided in an embodiment of this application;

[0139] Figure 15 is a schematic diagram of another battery device provided in an embodiment of this application;

[0140] Figure 16 is a partial schematic diagram of the battery cell bus provided in some embodiments of this application;

[0141] Figure 17 is a partial schematic diagram of a battery cell bus provided in some other embodiments of this application;

[0142] Figure 18 is a partial schematic diagram of a battery cell array provided in some embodiments of this application;

[0143] Figure 19 is a schematic diagram of the battery cell busbar and mounting bracket provided in some embodiments of this application;

[0144] Figure 20 is an enlarged view of part C shown in the box in Figure 19;

[0145] Figure 21 is an enlarged view of part B circled in Figure 3;

[0146] Figure 22 is a schematic diagram of the cooperation between the battery cell assembly and the reinforcing separator provided in some embodiments of this application;

[0147] Figure 23 is a partial enlarged view of a pouch cell provided in some embodiments of this application;

[0148] Figure 24 is a partial enlarged view of a pouch cell provided in some embodiments of this application;

[0149] Figure 25 is a schematic diagram of a battery device provided in some embodiments of this application;

[0150] Figure 26 is a cross-sectional view along the EE line shown in Figure 25;

[0151] Figure 27 is an enlarged view of part D shown in the box in Figure 26;

[0152] Figure 28 is a partial schematic diagram of a battery device provided in some embodiments of this application;

[0153] Figure 29 is a flowchart of a processing step of a battery device provided in some embodiments of this application;

[0154] Figure 30 is a flowchart of a processing step of a battery device provided in some embodiments of this application;

[0155] Figure 31 is a flowchart of a processing step of a battery device provided in some embodiments of this application.

[0156] Reference numerals: Vehicle 1000; Battery device 100; Cell module 101; Cell array 10; First cell array 10A; Second cell array 10B; First direction F1; Second direction F2; Third direction F3; First reserved space S1; Second reserved space S2; Cell group 1X; First edge 1X1; Second edge 1X2; Upstream cell group 1A; Intermediate cell group 1B; First end 1B1; Second end 1B2; Downstream cell group 1C; First cell group 1Xa; First lead-out portion 1211; Extension section 12111; Bending section 12112; Overlap section 12113; Second cell group 1Xb; Second lead-out portion 1212; Soft-pack cell 1; Soft-pack outer shell 11; Film portion 111; Sealing structure 112; Electrode terminal 12; Lead-out portion 121; Adapter piece 122; 2. Reinforcing partition; 23. Connecting part; 231. First edge; 3. Buffer; 4. Conductive structure; 41. Inter-row conductive structure; 5. Flexible bending conductive structure; 51. First conductive structure; 52. Second conductive structure; 6. Connecting plate; 20. Box body; 7. Cover plate; 71. Bottom plate; 711. Top plate; 712. Mounting bracket; 8. Second edge; 9. Sealing strip; 30. Heat exchange plate; 200. Controller; 300. Motor. Detailed Implementation

[0157] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0158] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0159] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0160] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0161] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0162] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0163] In this application, "multiple" means two or more, including two.

[0164] 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.

[0165] Currently used power batteries include some that utilize pouch cells. A pouch cell comprises a pouch casing and electrode assemblies housed within the casing. Each pouch cell has electrode terminals connected to the electrode assemblies and at least partially located outside the casing. Different pouch cells are connected in series or parallel via conductive connections between their electrode terminals. Typically, the electrode terminals requiring conductive connections are welded to the same conductive support, enabling conductive connections between multiple electrode terminals. However, the welding space between the electrode terminals and the conductive support is limited, making the operation difficult. Furthermore, it is challenging to inspect the welding quality after welding, and poorly welded areas are difficult to repair, resulting in low power battery production capacity and reliability. Moreover, the introduction of the conductive support not only increases the number of components, leading to increased weight and cost, but also occupies internal space, affecting the battery's energy density.

[0166] In view of this, this application proposes a battery device using pouch cells. During production, multiple pouch cells can be arranged in a row first, and then the electrode terminals of every two adjacent pouch cells can be connected together to obtain a flexible conductive structure. Each group of adjacent pouch cells can be divided into a cell group, and the flexible conductive structures at both ends of the cell group can be bent in opposite directions to form flexible bent conductive structures, thereby allowing multiple cell groups to be stacked along the thickness direction of the pouch cells.

[0167] Therefore, the battery device of this application embodiment has high packing efficiency of pouch cells, which greatly improves the production efficiency of the battery device. Moreover, since the conductive support is eliminated, the electrode terminals of adjacent pouch cells have a larger operating space during welding, thereby reducing the difficulty of welding operations, and the welding quality is easier to inspect and the welded position is easier to repair, thus improving the reliability of the battery device. Furthermore, by eliminating the conductive support, the number of components is reduced, which reduces the weight and cost of the battery device, and the space occupied by the conductive support is saved, which is beneficial to improving the energy density of the battery device.

[0168] The technical solutions described in the embodiments of this application are applicable to battery devices that include pouch cells and electrical devices that use battery devices.

[0169] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0170] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0171] 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 is equipped with a battery device 100, which can be located at the bottom, head, or tail 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.

[0172] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving. 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.

[0173] Please refer to Figures 2 and 3. Figure 2 is a structural schematic diagram of the battery device 100 provided in some embodiments of this application, and Figure 3 is a schematic diagram of the battery device 100 after the housing cover is hidden in some embodiments of this application. As shown in Figures 2 and 3, the battery device 100 may include a housing 20 and a pouch cell 1 disposed in the housing 20. There are multiple pouch cells 1, and the multiple pouch cells 1 can be connected in series, in parallel, or in a mixed manner. A mixed manner means that there are both series and parallel connections among the multiple pouch cells 1.

[0174] In a first aspect, embodiments of this application provide a battery device 100. Please refer to Figures 2 and 3, and in conjunction with Figures 4 and 5. Figure 4 is a stacking schematic diagram of a cell group 1X provided in an embodiment of this application, and Figure 5 is a stacking schematic diagram of another cell group 1X provided in an embodiment of this application. The battery device 100 includes multiple cell groups 1X stacked along a first direction F1, where the first direction F1 is the thickness direction of each pouch cell 1. Each cell group 1X includes at least one pouch cell 1, that is, each cell group 1X includes one or more pouch cells 1. For example, in the embodiment shown in Figure 4, each cell group 1X includes two pouch cells 1, and in the embodiment shown in Figure 5, each cell group 1X includes one pouch cell 1.

[0175] Referring to Figures 6-9, Figure 6 is an enlarged view of part A circled in Figure 5; Figure 7 is a schematic diagram of a cell array 10 provided in an embodiment of this application; Figure 8 is a schematic diagram of one processing state of the cell array 10 shown in Figure 7; and Figure 9 is a schematic diagram of another processing state of the cell array 10 shown in Figure 7. Each cell group 1X located between the two ends of the first direction F1 is electrically connected at one end along the second direction F2 to the cell group 1X upstream along the first direction F1, and at the other end along the second direction F2 to the cell group 1X downstream along the first direction F1. The connection position of the two interconnected cell groups 1X forms a flexible bent conductive structure 5.

[0176] The first direction F1 and the second direction F2 are arranged at an angle, for example, the first direction F1 and the second direction F2 intersect at a right angle, an acute angle, or an obtuse angle. For example, the first direction F1 is the thickness direction of each pouch cell 1, and the second direction F2 is the length direction of each pouch cell 1. In this case, the first direction F1 and the second direction F2 intersect at a right angle. However, this application is not limited to this; for example, in other embodiments of this application, the second direction F2 can also be the width direction of at least one pouch cell 1, etc.

[0177] In addition, it should be noted that "upstream" and "downstream" refer to both sides of the battery cell assembly 1X along the first direction F1. That is, one side of the battery cell assembly 1X along the first direction F1 is upstream, and the other side of the battery cell assembly 1X along the first direction F1 is downstream. However, it is not limited to which side of the battery cell assembly 1X "upstream" and "downstream" specifically refer to. It is only to indicate that they are both sides of the battery cell assembly 1X along the first direction F1.

[0178] In the above technical solution, among the multiple cell groups 1X stacked along the first direction F1, any cell group 1X other than the two cell groups 1X located at both ends on the first direction F1 can be used as the intermediate cell group 1B. In other words, among the multiple cell groups 1X stacked along the first direction F1, any cell group 1X sandwiched between two cell groups 1X can be used as the intermediate cell group 1B. The two ends of the intermediate cell group 1B along the second direction F2 are the first end 1B1 and the second end 1B2, respectively. The two cell groups 1X adjacent to the intermediate cell group 1B are the upstream cell group 1A and the downstream cell group 1C, respectively. The upstream cell group 1A is located upstream of the intermediate cell group 1B, and the downstream cell group 1C is located downstream of the intermediate cell group 1B. The end of the upstream cell assembly 1A near the first end 1B1 along the second direction F2 is electrically connected to the first end 1B1 through a flexible bending conductive structure 5, and the end of the downstream cell assembly 1C near the second end 1B2 along the second direction F2 is electrically connected to the second end 1B2 through a flexible bending conductive structure 5.

[0179] Referring to Figures 7-9, exemplarily, during processing, the upstream cell group 1A, the intermediate cell group 1B, and the downstream cell group 1C can be arranged in a row along the second direction F2, so that the upstream cell group 1A, the intermediate cell group 1B, and the downstream cell group 1C are arranged sequentially along the second direction F2 in a flattened state (as shown in Figure 8, for example). Adjacent positions of the upstream cell group 1A and the intermediate cell group 1B are connected to obtain a first conductive structure 51, and adjacent positions of the intermediate cell group 1B and the downstream cell group 1C are connected to obtain a second conductive structure 52. The first conductive structure 51 and the second conductive structure 52 are then connected... Electrical structures 52 are bent in opposite directions (for example, as shown in Figure 9). For example, the first direction F1 is the front-to-back direction. The first conductive structure 51 is bent forward to form a flexible bent conductive structure 5, and the second conductive structure 52 is bent backward to form another flexible bent conductive structure 5. This allows the upstream cell group 1A to be stacked in front of the middle cell group 1B, and the downstream cell group 1C to be stacked behind the middle cell group 1B. The upstream cell group 1A, the middle cell group 1B, and the downstream cell group 1C are stacked sequentially along the first direction F1 (for example, as shown in Figure 7).

[0180] Therefore, by connecting every two adjacent cell groups 1X together and bending the connection point to achieve stacking of adjacent cell groups 1X along the first direction F1, and then electrically connecting one end of cell group 1X along the second direction F2 to the cell group 1X upstream along the first direction F1, and electrically connecting the other end of cell group 1X along the second direction F2 to the cell group 1X downstream along the first direction F1, the packing efficiency and production efficiency of the battery device 100 can be effectively improved. Furthermore, since the connection of adjacent cell groups 1X does not require a conductive support, the operating space for connecting adjacent cell groups 1X is larger, thereby reducing the difficulty of the connection operation. The connection quality is also easier to detect, and the connection position is easier to repair, thus improving the reliability of the battery device 100. Moreover, by eliminating the conductive support and reducing the number of components, the weight and cost of the battery device 100 are reduced, and the space occupied by the conductive support is saved, which is beneficial to improving the energy density of the battery device 100.

[0181] For example, referring to FIG6, the pouch cell 1 includes a pouch shell 11, an electrode assembly, and electrode terminals 12. The electrode terminals 12 are electrically connected to the electrode assembly inside the pouch shell 11. The shell of the pouch cell 1 is the pouch shell 11, and the material of the pouch shell 11 is not limited, such as aluminum-plastic film. The electrode assembly may include positive and negative electrode sheets. At least a portion of the electrode terminals 12 is exposed outside the pouch shell 11. That is, the electrode terminals 12 may be completely exposed outside the pouch shell 11, or only a portion of the electrode terminals 12 may be exposed outside the pouch shell 11. In this application, the portion of the electrode terminals 12 exposed outside the pouch shell 11 is used as a lead-out portion 121. The lead-out portion 121 is used for connection between pouch cells 1. That is, different pouch cells 1 are electrically connected through direct or indirect connection between the lead-out portions 121, thereby realizing series and / or parallel connection between multiple pouch cells 1.

[0182] In this design, the electrode terminals 12 of two pouch cells 1 are connected together to form a conductive structure 4. That is, the lead-out portions 121 of the two pouch cells 1 are directly or indirectly connected together to form the conductive structure 4. The conductive structure 4 located at the end of the cell assembly 1X along the second direction F2 is configured to be flexibly deformable, and bent to form a flexible bent conductive structure 5. This allows the two cell assemblies 1X connected by the flexible bent conductive structure 5 to move relative to each other to a stacked state along the first direction F1. It is worth noting that the "direct or indirect connection" described in this application does not include integrated connections such as one-piece molding, but rather two separate components connected together through processes such as welding, bonding, etc.

[0183] In the embodiments of this application, the number of pouch cells 1 included in the cell group 1X is not limited. The cell group 1X may include one pouch cell 1 or multiple pouch cells 1. For example, each cell group 1X may include one pouch cell 1, or each cell group 1X may include multiple pouch cells 1, or at least one cell group 1X may include one pouch cell 1 while at least another cell group 1X may include multiple pouch cells 1.

[0184] In some embodiments of this application, the thickness direction of the pouch cell 1 is the first direction F1, and the cell group 1X includes one pouch cell 1 or includes multiple pouch cells 1 laid flat on a plane perpendicular to the first direction F1. Specifically, the cell group 1X including one pouch cell 1 is defined as the first cell group, and the cell group 1X including multiple pouch cells 1 is defined as the second cell group, wherein the multiple pouch cells 1 in the second cell group are laid flat on a plane perpendicular to the first direction F1.

[0185] Since multiple pouch cells 1 in the second cell group are laid flat on a plane perpendicular to the first direction F1, it means that any two pouch cells 1 in the second cell group are not stacked along the first direction F1. Therefore, it is not necessary to bend the connection position of any two adjacent pouch cells 1 in the second cell group, which can save processes and improve production efficiency.

[0186] Thus, since the thickness direction of the pouch cell 1 is the first direction F1, the thickness of the first cell group along the first direction F1 is the thickness of a single pouch cell 1, and the thickness of the second cell group along the first direction F1 is the same as the thickness of the thickest pouch cell 1 in the second cell group.

[0187] Therefore, among the multiple cell groups 1X stacked along the first direction F1, whether they are all first cell groups, all second cell groups, or a combination of first and second cell groups, the total thickness of the multiple cell groups 1X stacked along the first direction F1 is small, occupying less space. Furthermore, the flexible bending conductive structure 5 is bent along the thickness direction of the pouch cell 1, requiring a short length, making it less prone to breakage and ensuring reliable conductivity.

[0188] Of course, this application is not limited to this. In other embodiments of this application, the length or width direction of the soft-pack battery cell 1 can also be set to the first direction F1.

[0189] Of course, this application is not limited to this. In other embodiments of this application, when the cell group 1X includes a plurality of pouch cells 1, at least two pouch cells 1 in the cell group 1X may be stacked along the first direction F1.

[0190] In some embodiments, multiple pouch cells 1 arranged in a flat arrangement within a cell group 1X are arranged along a second direction F2, with adjacent pouch cells 1 connected at adjacent positions. Therefore, during processing, the pouch cells 1 can be arranged in a row along the second direction F2, with each adjacent pair of pouch cells 1 connected at adjacent positions. This allows for folding by group, enabling multiple cell groups 1X to be stacked along a first direction F1. This technical solution allows for rapid grouping and improves production efficiency.

[0191] For example, in some embodiments, referring to Figures 7-9, the battery device 100 may include a first cell row 10A, the first cell row 10A including a plurality of cell groups 1X stacked along a first direction F1, and each cell group 1X in the first cell row 10A includes one pouch cell 1.

[0192] Therefore, the structure of the first cell group 10A is simple and the grouping efficiency is high. It also helps to increase the operating space when connecting two adjacent cell groups 1X, reduces the difficulty of connecting two adjacent cell groups 1X, and makes the connection quality easy to detect and the connection position easy to repair, thereby improving the production capacity and reliability of the battery device 100.

[0193] For example, referring to Figures 7-9, when producing the first cell array 10A, multiple soft-pack cells 1 can be arranged in sequence along the second direction F2 to present a flattened form (as shown in Figure 8). Then, the adjacent electrode terminals 12 of each two adjacent soft-pack cells 1 are directly or indirectly connected together to obtain a conductive structure 4. Next, each conductive structure 4 is bent into a flexible bent conductive structure 5, so that each two adjacent soft-pack cells 1 change from a flattened state to a stacked state, and multiple soft-pack cells 1 change from a flattened state to a form in which they are connected end to end in a Z-shape and stacked along the first direction F1.

[0194] This increases the operating space when connecting the electrode terminals 12 of the two pouch cells 1, reduces the difficulty of connecting the electrode terminals 12 of the two pouch cells 1, and makes it easier to detect the connection quality and repair the connection position. This improves the production capacity and reliability of the battery device 100 and increases the grouping efficiency of the first cell row 10A.

[0195] For example, in some embodiments, referring to FIG10, FIG10 is a schematic diagram of a soft-pack battery cell provided in an embodiment of the present application; the first direction F1 is the thickness direction of the soft-pack battery cell 1, the second direction F2 is the length direction of the soft-pack battery cell 1, and the ends of two adjacent soft-pack battery cells 1 on the same side are connected by a flexible bending conductive structure 5.

[0196] In the above technical solution, by setting the first direction F1 as the thickness direction of the soft-pack battery cell 1 and the second direction F2 as the length direction of the soft-pack battery cell 1, the ends of two adjacent soft-pack battery cells 1 on the same side along the length direction are connected by a flexible bending conductive structure 5, and the two adjacent soft-pack battery cells 1 are stacked along the thickness direction. Thus, both the connection of two adjacent soft-pack battery cells 1 and the bending of the flexible bending conductive structure 5 are very convenient, reducing the processing difficulty of the first battery cell array 10A and shortening the length of the flexible bending conductive structure 5, thereby saving costs.

[0197] For example, the first direction F1 is the thickness direction of the soft-pack battery cell 1, the second direction F2 is the length direction of the soft-pack battery cell 1, and electrode terminals 12 extend from both ends of the soft-pack battery cell 1 along its length direction. The electrode terminals 12 at the same side ends of two adjacent soft-pack battery cells 1 are directly or indirectly connected to form a flexible bending conductive structure 5.

[0198] In this way, by setting the first direction F1 as the thickness direction of the soft-pack battery cell 1, setting the second direction F2 as the length direction of the soft-pack battery cell 1, and setting the electrode terminals 12 to extend from both ends in the length direction of the soft-pack battery cell 1, the processing difficulty of the soft-pack battery cell 1 is reduced. Moreover, the two ends in the length direction of the soft-pack battery cell 1 can be easily connected to the corresponding side ends of the adjacent stacked soft-pack battery cells 1 through the flexible bending conductive structure 5, which shortens the length of the flexible bending conductive structure 5 and saves costs.

[0199] In some embodiments, referring to FIG7, each pouch cell 1 in the first cell row 10A has the same length and the same width. The specifications of multiple pouch cells 1 can be almost identical, which is beneficial to the processing of pouch cells 1. When arranging, there is no need to consider the differences in the shape between different pouch cells 1 to affect the arrangement, thereby improving production efficiency.

[0200] Furthermore, it facilitates center alignment between any two adjacent pouch cells 1 in the first cell row 10A. The "center" of a pouch cell 1 refers to the intersection of its length centerline and width centerline. Each adjacent pouch cell 1 in the first cell row 10A is stacked along the first direction F1 and center-aligned, ensuring that the two edges in the width direction and the two edges in the length direction of any two adjacent pouch cells 1 are aligned. The total space occupied by all pouch cells 1 in the first cell row 10A along the length direction is the same as that occupied by a single pouch cell 1 in the length direction, and the total space occupied by all pouch cells 1 in the first cell row 10A along the width direction is the same as that occupied by a single pouch cell 1 in the width direction. This significantly reduces the overall space occupied by the first cell row 10A along the length and width directions of the pouch cells 1, thus improving the energy density of the battery device.

[0201] Referring to Figure 11, which is a schematic diagram of a battery device provided in an embodiment of this application; in some embodiments, when the second direction F2 is the length direction of the pouch cell 1, the battery device 100 may include a plurality of first cell rows 10A arranged along the second direction F2. In the above technical solution, when the overall spatial dimension of the battery device 100 along the second direction F2 is large, by setting the second direction F2 to be the length direction of the pouch cell 1 and the battery device 100 including a plurality of first cell rows 10A arranged along the second direction F2, the length of a single pouch cell 1 can be reduced, the processing difficulty of a single pouch cell 1 can be reduced, and the structural strength and structural stability of a single pouch cell 1 can be improved.

[0202] In some embodiments, referring to Figures 10 and 11, two first cell rows 10A arranged adjacent to each other along the second direction F2 are connected by an inter-row conductive structure 41. This allows the first cell rows 10A adjacent to each other along the second direction F2 to be connected in series or in parallel. On the one hand, this simplifies the electrode output of multiple first cell rows 10A, and on the other hand, it meets the power parameter design requirements of the battery device 100.

[0203] For example, referring to FIG11, in two adjacent first cell rows 10A arranged along the second direction F2, the adjacent ends of two cell groups 1X located on the first direction F1 and opposite each other along the second direction F2 are connected by an inter-row conductive structure 41. Thus, the inter-row conductive structure 41 can be located at one end along the first direction F1 between the two connected first cell rows 10A, thereby shortening the length of the inter-row conductive structure 41, reducing costs, saving space occupied by the inter-row conductive structure 41 within the battery device 100, and increasing the energy density of the battery device 100.

[0204] For example, in two first cell rows 10A arranged adjacent to each other in the second direction F2, the electrode terminals 12 of the adjacent ends of the two cell groups 1X located on the first direction F1 and opposite to each other along the second direction F2 are directly or indirectly connected to form an inter-row conductive structure 41, which facilitates processing.

[0205] Of course, this application is not limited to this. When the length of a single pouch cell 1 is relatively long, for example, when the pouch cell 1 is in the form of a blade, the battery device 100 may be configured to include only one first cell array 10A.

[0206] For example, in some other embodiments, referring to Figures 12-13, Figure 12 is a schematic diagram of another cell array provided in an embodiment of this application; Figure 13 is a schematic diagram of a processing state of the cell array shown in Figure 12; the battery device 100 includes a second cell array 10B, the second cell array 10B includes a plurality of cell groups 1X stacked along a first direction F1, and at least one cell group 1X in the second cell array 10B includes a plurality of pouch cells 1. Therefore, the number of flexible bending conductive structures 5 can be reduced, thereby reducing the number of bending times of the conductive structures 4, and thus improving the grouping efficiency of the second cell array 10B.

[0207] In other words, at least one cell group 1X in the second cell array 10B includes multiple pouch cells 1. For example, each cell group 1X in the second cell array 10B includes multiple pouch cells 1; or, for another example, several cell groups 1X in the second cell array 10B include multiple pouch cells 1, while several other cell groups 1X in the second cell array 10B include only one pouch cell 1. When a cell group 1X includes multiple pouch cells 1, the conductive structure 4 connecting the multiple pouch cells 1 in the cell group 1X in pairs does not need to be bent.

[0208] For example, referring to Figures 12-13, the first direction F1 is the thickness direction of the pouch cell 1. All the pouch cells 1 in a cell group 1X, which includes multiple pouch cells 1, are laid flat on a plane perpendicular to the first direction F1. That is, any two pouch cells 1 in a cell group 1X do not stack along the first direction F1. Therefore, there is no need to bend the connection points of adjacent pouch cells 1 in the same cell group 1X, thereby saving processes and improving production efficiency. In short, in the above technical solution, the multiple pouch cells 1 in the cell group 1X do not require additional bending processes due to the need to stack along the first direction F1, thereby improving grouping efficiency.

[0209] For example, referring to Figures 12-13, the second direction F2 is the length direction of the pouch cell 1. The pouch cells 1 included in the cell group 1X in the second cell row 10B are arranged along the second direction F2. The adjacent ends of two adjacent pouch cells 1d are connected by a conductive structure 4. The conductive structure 4 located at the end of the cell group 1X along the second direction F2 is a flexible structure and is bent to form a flexible bent conductive structure 5.

[0210] In this way, when producing the second cell array 10B, multiple soft-pack cells 1 can be arranged in sequence along the second direction F2 in a flattened form. Then, the adjacent ends of each pair of adjacent soft-pack cells 1 are connected (for example, the adjacent electrode terminals 12 are directly or indirectly connected together) to obtain a conductive structure 4. Next, the two conductive structures 4 at both ends of each cell group 1X along the second direction F2 are bent (for example, as shown in Figure 13) to form a flexible bent conductive structure 5, so that each pair of adjacent cell groups 1X changes from a flattened state to a stacked state, and multiple cell groups 1X change from a flattened state to a form in which they are connected end to end in a Z-shape and stacked along the first direction F1, thereby making the grouping efficiency of the second cell array 10B higher.

[0211] In the above technical solution, by setting the first direction F1 as the thickness direction of the soft-pack battery cell 1 and the second direction F2 as the length direction of the soft-pack battery cell 1, the multiple soft-pack battery cells 1 included in the battery group 1X in the second battery cell row 10B are arranged along the second direction F2. The adjacent ends of two adjacent soft-pack battery cells 1d are connected by a conductive structure 4. The conductive structure 4 located at the end of the battery group 1X along the second direction F2 is a flexible structure and is bent to form a flexible bent conductive structure 5, thereby improving the grouping efficiency of the second battery cell row 10B, shortening the length of the conductive structure 4 and the flexible bent conductive structure 5, and saving costs.

[0212] In some embodiments, when the multiple pouch cells 1 included in the cell group 1X of the second cell row 10B are arranged along the second direction F2, the total length of each cell group 1X in the second cell row 10B along the second direction F2 is the same. It is worth noting that the number of pouch cells 1 included in each cell group 1X of the second cell row 10B can be the same or different, for example, it can be one or more. When the cell group 1X includes only one pouch cell 1, the total length of the cell group 1X along the second direction F2 is the length of the single pouch cell 1; when the cell group 1X includes multiple pouch cells 1 arranged along the second direction F2, the total length of the cell group 1X along the second direction F2 is slightly greater than the sum of the lengths of the multiple individual pouch cells 1 it includes. Therefore, the space occupied by all the cell groups 1X in the second cell row 10B along the second direction F2 is the same as the space occupied by a single cell group 1X along the second direction F2, which can reduce the space occupied in the second direction F2 and help improve the energy density of the battery device 100.

[0213] It is worth noting that the number of pouch cells 1 included in each cell group 1X in the second cell row 10B can be the same or different, the arrangement of the multiple pouch cells 1 included in each cell group 1X in the second cell row 10B can be the same or different, and the shape of each pouch cell 1 in the second cell row 10B can be the same or different.

[0214] For example, referring to Figures 12-13, each cell group 1X in the second cell row 10B includes the same shape, arrangement, and number of pouch cells 1. That is, all pouch cells 1 in the second cell row 10B have the same shape (i.e., shape and size), each cell group 1X in the second cell row 10B includes the same number of pouch cells 1, and the arrangement of the multiple pouch cells 1 in each cell group 1X is the same. Therefore, multiple cell groups 1X are indistinguishable in appearance, which is beneficial for mass production of cell groups 1X. Furthermore, during arrangement, there is no need to consider the differences in shape between different pouch cells 1, thus improving production efficiency. Moreover, when bending the selective conductive structure 4, grouping equal numbers of pouch cells 1 together avoids the problem of incorrect counting.

[0215] Furthermore, it facilitates the overlapping of the projections of multiple cell groups 1X stacked in the second cell row 10B along the first direction F1, ensuring that the edges of every two adjacent cell groups 1X in the second cell row 10B are aligned. As a result, the overall space occupied by the second cell row 10B formed by stacking multiple cell groups 1X along the first direction F1 is the same as the space occupied by a single cell group 1X in the second cell row 10B in the first direction F1. This reduces the overall space occupied by the second cell row 10B in the first direction F1, increases the energy density of the battery device 100, and also facilitates the uniformity of the specifications of each flexible bent conductive structure 5 in the second cell row 10B, rather than having some longer and some shorter. This makes it easier to process and mass-produce, and also makes it easier to control the overall conductivity of the battery device 100.

[0216] Furthermore, when the overall spatial dimension of the battery device 100 along the second direction F2 is large, by setting the second direction F2 as the length direction of the pouch cell 1, and arranging the multiple pouch cells 1 included in the cell group 1X in the second cell row 10B along the second direction F2, the battery device 100 can have only one second cell row 10B on the second direction F2 (for example, as shown in FIG. 14, FIG. 14 is a schematic diagram of a battery device provided in an embodiment of this application), thereby reducing the length of a single pouch cell 1 and reducing the processing difficulty of a single pouch cell 1. Moreover, this design can also facilitate the electrode output of the battery device 100, that is, the electrodes of the two cell groups 1X located at both ends of the second cell row 10B on the first direction F1 can be output along the second direction F2 at the ends that are far away from each other. Of course, this application is not limited to this. For example, in other embodiments of this application, the battery device 100 can also have multiple second cell rows 10B on the second direction F2 (this embodiment is not shown in the figure).

[0217] Furthermore, in some embodiments of this application, the battery device 100 may also include a first cell array 10A and a second cell array 10B (for example, as shown in FIG. 15, which is a schematic diagram of another battery device provided in an embodiment of this application). The relative arrangement of the first cell array 10A and the second cell array 10B is not limited; for example, they may be arranged along a first direction F1. The adjacent ends of the first cell array 10A and the second cell array 10B may also be connected through the inter-array conductive structure 41, thereby simplifying the electrode output and realizing series-parallel connection.

[0218] In some embodiments of this application, referring to FIG6, the soft-pack battery cell 1 includes a soft-pack outer shell 11 and an electrode terminal 12. The electrode terminal 12 is connected to the electrode assembly inside the soft-pack outer shell 11 and includes a lead-out portion 121 extending out of the soft-pack outer shell 11. The lead-out portions 121 adjacent to each other in the soft-pack outer shell 11 are directly or indirectly connected to form a conductive structure 4. The conductive structure 4 located at the end of the battery cell assembly 1X along the second direction F2 is a flexible structure and is bent to form a flexible bent conductive structure 5.

[0219] In other words, whether it is two adjacent pouch cells 1 along the first direction F1 or two adjacent pouch cells 1 along the second direction F2, they can form a conductive structure 4 by connecting the electrode terminals 12 on adjacent sides. It is not required that each conductive structure 4 be flexible and deformable. However, the conductive structure 4 located at the end of the cell group 1X along the second direction F2 and used to connect two adjacent cell groups 1X needs to have the ability to be flexible and deformable, so that a flexible bending conductive structure 5 can be formed through its flexible deformation. For example, referring to Figure 13, when the cell group 1X includes multiple pouch cells 1, the conductive structure 4 connecting adjacent pouch cells 1 in the same cell group 1X may or may not have the ability to be flexible and deformable.

[0220] In this way, the electrode terminals 12 of the two pouch cells 1 can be directly or indirectly connected to obtain a conductive structure 4 including at least two electrode terminals 12 after connection. The conductive structure 4 realizes the electrical connection of the two pouch cells 1. The conductive structure 4 at least located at the end of the cell group 1X along the second direction F2 can undergo flexible bending deformation, so that a flexible bending conductive structure 5 can be obtained through its bending deformation. This allows the two cell groups 1X connected by the flexible bending conductive structure 5 to undergo relative movement to change their relative position, so that the two cell groups 1X can be transformed into a stacked state along the first direction F1.

[0221] It is worth noting that the relative positions of the electrode terminals 12 of the two pouch cells 1 when connected can be in a flat state, but are not limited to a flat state. For example, they can also be set at an angle, such as one side surface of the thickness direction of one pouch cell 1 forming a large acute angle, right angle, or obtuse angle with one side surface of the thickness direction of the other pouch cell 1. This can increase the operating space when connecting the electrode terminals 12 of the two pouch cells 1, reduce the difficulty of connecting the electrode terminals 12 of the two pouch cells 1, and make the connection quality easier to detect and the connection position easier to repair, thereby improving the production capacity and reliability of the battery device 100.

[0222] In this way, the two cell packs 1X only need to be stacked after being connected by bending and deforming the conductive structure 4. They do not need to be stacked during the connection process. This increases the operational space for connecting the electrode terminals 12 of the two pouch cells 1, reduces the difficulty of connecting the electrode terminals 12, and makes it easier to inspect the connection quality and repair the connection position. This improves the production capacity and reliability of the battery device 100. Furthermore, this connection method eliminates the need for the rigid conductive support used to connect the two pouch cells in related technologies, reducing the number of components and lowering the weight and cost of the battery device 100. It also saves space occupied by the rigid conductive support, which is beneficial for increasing the energy density of the battery device 100.

[0223] Therefore, by connecting the adjacent electrode terminals 12 of two adjacent pouch cells 1 to form a conductive structure 4, and setting the conductive structure 4 at the end of the cell assembly 1X along the second direction F2 as a flexible structure and bending it to form a flexible bent conductive structure 5, it is beneficial to process the conductive structure 4 and the flexible bent conductive structure 5, and it is also beneficial to shorten the length of the electrode terminal 12, the conductive structure 4 and the flexible bent conductive structure 5, thus saving production costs.

[0224] In some embodiments of this application, referring to Figures 6 and 10, the second direction F2 is the length direction of the pouch cell 1. Electrode terminals 12 extend from both ends of the pouch cell 1 along its length direction. Adjacent pouch cells 1 are connected through adjacent electrode terminals 12. That is, for any two adjacent pouch cells 1, their adjacent electrode terminals 12 are directly or indirectly connected to achieve the connection between the two pouch cells 1. The cell group 1X includes one pouch cell 1 or includes multiple pouch cells 1 arranged sequentially along the second direction F2.

[0225] For example, the length direction of the soft-pack battery cell 1 is the left-right direction, and the thickness direction of the soft-pack battery cell 1 is the front-back direction. During processing, multiple soft-pack battery cells 1 can be arranged in a row along the left-right direction, and the two adjacent electrode terminals 12 can be connected to obtain a bent conductive structure 4. Then, the conductive structure 4 of the left (or right) end of the battery cell group 1X is bent forward, and the conductive structure 4 of the right (or left) end of the battery cell group 1X is bent backward, so that multiple battery cell groups 1X can be stacked along the front-back direction. In this way, the electrode terminal 12 of the left end of a battery cell group 1X can be connected to the electrode terminal 12 of the left end of the battery cell group 1X adjacent to it in front (or behind), and the electrode terminal 12 of the right end of the battery cell group 1X can be connected to the electrode terminal 12 of the right end of the battery cell group 1X adjacent to it behind (or in front).

[0226] In the above technical solution, by setting the electrode terminals 12 to extend from both ends along the length of the pouch cell 1, the processing difficulty of the pouch cell 1 is reduced. Moreover, by setting the second direction F2 as the length direction of the pouch cell 1, it is beneficial to realize that one end of each cell group 1X located between the two ends of the first direction F1 along the second direction F2 is electrically connected to the cell group 1X upstream along the first direction F1 through the flexible bending conductive structure 5, and the other end along the second direction F2 is electrically connected to the cell group 1X downstream along the first direction F1 through the flexible bending conductive structure 5. For example, during processing, multiple pouch cells 1 can be arranged in a row along the length direction of the pouch cell 1, and each pair of adjacent electrode terminals 12 can be connected to obtain a conductive structure 4. Then, the conductive structure 4 is bent so that multiple pouch cells 1 can be divided into multiple cell groups 1X, and multiple cell groups 1X can be stacked along the thickness direction of the pouch cell 1, thereby simplifying processing, improving grouping efficiency, and shortening the length of the flexible bending conductive structure 5. Moreover, the bent conductive structure 4 only occupies the space on both sides of the length direction of the soft-pack battery cell 1, and does not occupy the space on both sides of the width direction of the soft-pack battery cell 1. When the width direction of the soft-pack battery cell 1 is arranged according to the height direction, the space occupied by the battery device 100 in the height direction can be reduced.

[0227] Of course, this application is not limited to this. The two electrode terminals 12 of the pouch cell 1 can also be disposed at other positions of the pouch cell 1. For example, the two electrode terminals 12 of the pouch cell 1 can also be disposed at both ends in the width direction of the pouch cell 1; or, for example, one of the two electrode terminals 12 of the pouch cell 1 can be disposed at one end in the width direction of the pouch cell 1, and the other can be disposed at one end in the length direction of the pouch cell 1, and so on. Therefore, based on the different distribution positions of the electrode terminals 12, the arrangement of the multiple pouch cells 1 in the cell group 1X can be flexibly selected.

[0228] In some embodiments, referring to Figures 7-9, and Figures 12 and 13, the first direction F1 is the thickness direction of the pouch cell 1, the width direction of the pouch cell 1 is the third direction F3, and the projections of two cell groups 1X stacked and adjacent to each other along the first direction F1 coincide.

[0229] In the above technical solution, since the first direction F1 is the thickness direction of the soft-pack cell 1, it is beneficial to reduce the space occupied by multiple cell groups 1X along the first direction F1 after they are stacked. Moreover, the space occupied by the cell row 10 formed by the multiple cell groups 1X stacked along the first direction F1 is the same as the space occupied by a single cell group 1X in the cell row 10 in the first direction F1. This can reduce the space occupied by the cell row 10 in the first direction F1 and improve the energy density of the battery device 100.

[0230] In some embodiments of this application, referring to FIG16, which is a partial schematic diagram of a cell array provided in some embodiments of this application, the leads 121 from two pouch cells 1 in the flexible bending conductive structure 5 are overlapped and connected. That is, the lead 121 of the pouch cell 1 in one cell group 1X is overlapped and connected with the lead 121 of the pouch cell 1 in the adjacent cell group 1X.

[0231] In this way, two adjacent cell groups 1X can be connected by directly overlapping the lead-out portion 121 of the soft-pack cell 1. This allows the two cell groups 1X to have a larger connection area, making the connection between the two cell groups 1X more stable and reliable. Moreover, compared with indirect connection, direct connection can simplify the structure, reduce parts, improve assembly efficiency, further improve grouping efficiency, and increase production capacity.

[0232] For example, the lead-out portion 121 can be configured as a bendable metal sheet, thereby enabling the conductive structure 5 to bend or flexibly bend through at least one lead-out portion 121 connected by overlap. For example, the electrode terminal 12 can be a protruding part of the electrode sheet in the electrode assembly, such as an aluminum sheet or a copper sheet.

[0233] For example, referring to FIG16, the two leads 121 constituting the lap joint can be connected at the lap joint by welding or conductive adhesive. This not only facilitates operation but also achieves a more stable and reliable electrical connection.

[0234] For example, referring to FIG16, the overlapping connection position P1 of the two leads 121 in the flexible bending conductive structure 5 is staggered from the bending position P2 of the flexible bending conductive structure 5. This allows the flexible bending conductive structure 5 to be bent more easily, and the bending does not adversely affect the reliability and stability of the overlapping connection between the leads 121, thereby improving the connection reliability and electrical connection stability between the battery cells 1X.

[0235] In some embodiments of this application, referring to FIG16, the bending position P2 of the flexible bending conductive structure 5 is centered, and the overlapping connection position P1 of the two leads 121 in the flexible bending conductive structure 5 is located on one side of the bending position P2 in the first direction F1 and is opposite to the corresponding cell group 1X in the second direction F2. That is, along the extension direction of the flexible bending conductive structure 5, the distance from the bending position P2 of the flexible bending conductive structure 5 to each cell group 1X is equal, which helps to improve the structural stability of the flexible bending conductive structure 5 and reduce the stress concentration of the flexible bending conductive structure 5.

[0236] In some embodiments of this application, referring to FIG16, the two leads 121 constituting an overlapping connection in the flexible bending conductive structure 5 are respectively the first lead 1211 and the second lead 1212. The cell group 1X extending out of the first lead 1211 is the first cell group 1Xa, and the cell group 1X extending out of the second lead 1212 is the second cell group 1Xb. The first cell group 1Xa and the second cell group 1Xb are stacked adjacent to each other. The length of the first lead 1211 is greater than the length of the second lead 1212. The first lead 1211 includes an extension segment 1. 2111, bending section 12112 and overlapping section 12113, extension section 12111 is opposite to the first cell group 1Xa along the second direction F2, overlapping section 12113 is spaced apart from extension section 12111 along the first direction F1, overlapping section 12113 is opposite to the second cell group 1Xb along the second direction F2, bending section 12112 is bent and its two ends are respectively connected to extension section 12111 and overlapping section 12113, second lead-out portion 1212 is opposite to the second cell group 1Xb along the second direction F2, and overlaps with overlapping section 12113.

[0237] Therefore, it is relatively easy to achieve that the overlapping connection position P1 of the two leads 121 in the flexible bending conductive structure 5 is staggered from the bending position P2 of the flexible bending conductive structure 5, and the bending is relatively easy. It is worth noting that, along the first direction F1, for every two adjacent battery cell groups 1X, one can be selected as the first battery cell group 1Xa, and the other can be selected as the second battery cell group 1Xb.

[0238] For example, the second direction F2 is the length direction of the pouch cell 1, and each pouch cell 1 has a first lead-out portion 1211 and a second lead-out portion 1212 at both ends along its length direction. In this way, by setting the two leads-out portions 121 of each pouch cell 1 along its length direction to be one long and one short, for example, if the length direction of the pouch cell 1 is left-right, the left lead-out portion 121 is shorter and the right lead-out portion 121 is longer, when multiple pouch cells 1 are arranged in a row along the length direction of the pouch cell 1, they can all be arranged in the above manner, so that the connection between every two adjacent pouch cells 1 is connected by a lead-out portion 121 of one long and one short.

[0239] Of course, this application is not limited to this. Referring to Figure 17, which is a partial schematic diagram of a cell array provided in some other embodiments of this application, the two leads 121 constituting the overlapping connection in the flexible bending conductive structure 5 can also be configured to have the same length, and the bending position P2 of the flexible bending conductive structure 5 is located at the unconnected overlapping part of the two leads 121. Therefore, when producing the pouch cell 1, the two leads 121 at both ends of the pouch cell 1 can be cut to equal lengths. When arranging multiple pouch cells 1, it is not necessary to select the placement direction due to the different lengths of the leads 121, thereby improving production efficiency.

[0240] In some embodiments of this application, referring to FIG18, FIG18 is a partial schematic diagram of a cell array provided in some embodiments of this application. In the flexible bending conductive structure 5, the lead-out portions 121 from two pouch cells 1 are indirectly connected through an adapter piece 122. That is, the lead-out portion 121 of a pouch cell 1 in a cell group 1X is overlapped with the lead-out portion 121 of a pouch cell 1 in an adjacent cell group 1X.

[0241] Therefore, by setting the adapter piece 122 to connect the lead-out portions 121 of the two pouch cells 1, the length of the lead-out portions 121 can be shortened, reducing the processing difficulty of the pouch cells 1. In addition, the standardized production adapter piece 122 can be used for fast and efficient connection processing, making it convenient and efficient to connect multiple pouch cells 1, and ensuring good consistency in the conductivity of each flexible bending conductive structure 5.

[0242] At least one of the lead-out portion 121 and the adapter piece 122 constituting the overlapping connection can be bent, so that the bending position P4 of the flexible bending conductive structure 5 is located at at least one of the lead-out portion 121 and the adapter piece 122. For example, the adapter piece 122 is a bendable metal sheet so that the flexible bending conductive structure 5 can be bent by bending the adapter piece 122. Or, for example, the lead-out portion 121 is a bendable metal sheet so that the flexible bending conductive structure 5 can be bent by bending the lead-out portion 121.

[0243] In some embodiments of this application, referring to FIG18, the adapter piece 122 and the lead-out portion 121 are connected by an overlap. This overlap connection allows for a larger connection area between the adapter piece 122 and the lead-out portion 121, resulting in a more stable and reliable connection between the two battery cell assemblies 1X. The specific method of overlap connection between the adapter piece 122 and the lead-out portion 121 is not limited; for example, it can be overlapped and bonded with conductive adhesive, or overlapped and welded, etc. This not only facilitates operation but also achieves a more stable and reliable electrical connection.

[0244] In some embodiments of this application, referring to FIG18, the overlapping connection position P3 of the adapter piece 122 and the lead-out portion 121 is offset from the bending position P4 of the flexible bending conductive structure 5.

[0245] In other words, the flexible bending conductive structure 5 does not bend at the overlapping connection position P3 between the adapter piece 122 and the lead-out portion 121. This allows the flexible bending conductive structure 5 to bend more easily, and the bending does not adversely affect the reliability and stability of the overlapping connection between the adapter piece 122 and the lead-out portion 121, thereby improving the connection reliability and electrical connection stability between the battery cells 1X.

[0246] In some embodiments of this application, referring to FIG18, the flexible bending conductive structure 5 is bent at the adapter piece 122, and the bending position P4 of the flexible bending conductive structure 5 is centered.

[0247] In other words, along the extension direction of the flexible bending conductive structure 5, the distance from the bending position P4 of the flexible bending conductive structure 5 to each cell group 1X is equal. This helps to improve the structural stability of the flexible bending conductive structure 5 and reduce stress concentration. Furthermore, the length of the adapter piece 122 can be relatively long, with part used to overlap with the lead-out portion 121 and the remainder used for bending, thereby simplifying the design of the lead-out portion 121 and further shortening its length.

[0248] In some embodiments of this application, referring to Figures 16-18, the bending position of the flexible bending conductive structure 5 is offset from the connection conductive position of the two battery cell groups 1X in the flexible bending conductive structure 5. For example, the bending position P2 shown in Figures 16-17 is offset from the overlapping connection position P1, and the bending position P4 shown in Figure 18 is offset from the overlapping connection position P3.

[0249] It is worth noting that the connection between the two battery cell groups 1X in the flexible bending conductive structure 5 is not limited to direct connection by overlapping or indirect connection by adapter piece 122. For example, the connection can also be achieved by perforation or other methods. However, the connection point will form a conductive connection, thereby realizing the electrical connection between the two battery cell groups 1X through the flexible bending conductive structure 5. Thus, the connection point that forms a conductive connection is the connection conductive point of the two battery cell groups 1X (for example, the overlapping connection point P1 shown in Figures 16-17, or the overlapping connection point P3 shown in Figure 18).

[0250] Therefore, by setting the bending position of the flexible bending conductive structure 5 to be staggered from the connection conductive position of the two battery cell groups 1X in the flexible bending conductive structure 5, the flexible bending conductive structure 5 can be bent more easily, and the bending does not adversely affect the connection reliability and stability of the two battery cell groups 1X in the flexible bending conductive structure 5, thereby improving the connection reliability and electrical connection stability between the battery cell groups 1X.

[0251] In some embodiments of this application, referring to Figures 16-18, the bending corners of the flexible bending conductive structure 5 (e.g., bending position P2 shown in Figures 16-17, and bending position P4 shown in Figure 18) are rounded. This reduces stress concentration at the bending points and improves the connection reliability and conductivity stability of adjacent cell groups 1X.

[0252] The shape of the flexible bending conductive structure 5 is not limited. For example, the flexible bending conductive structure 5 can be U-shaped, that is, the flexible bending conductive structure 5 can also be formed into a U-shaped structure with two bending corners (as shown in Figures 16-17), thereby saving space; or, for example, the flexible bending conductive structure 5 can be C-shaped, that is, the flexible bending conductive structure 5 can be formed into a C-shaped structure with one bending corner (as shown in Figure 18), thereby reducing the processing difficulty.

[0253] In some embodiments of this application, referring to FIG6 and in conjunction with FIG19-20, FIG19 is a schematic diagram of the cell array and mounting bracket provided in some embodiments of this application; FIG20 is an enlarged view of part C shown in FIG19. The two sides of the cell array 1X on the third direction F3 are the first edge 1X1 and the second edge 1X2, respectively. The flexible bending conductive structure 5 is disposed on the third direction F3 relative to the second edge 1X2 and close to the first edge 1X1, so as to form a first reserved space S1 on the side of the flexible bending conductive structure 5 close to the second edge 1X2.

[0254] Among them, the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other. For example, the first direction F1 is the thickness direction of the soft-pack battery cell 1, the second direction F2 is the length direction of the soft-pack battery cell 1, and the third direction F3 is the width direction of the soft-pack battery cell 1.

[0255] Therefore, the first reserved space S1 can be used to store other components, making full use of the space of the battery device 100 in the third direction F3 where the flexible bending conductive structure 5 is set, so as to reduce the occupation of other spaces and thus help to improve the energy density of the battery device 100.

[0256] In some embodiments of this application, referring to Figures 6 and 20, the flexible bending conductive structure 5 is located on the side of the center line CL of the cell assembly 1X in the third direction F3, near the first edge 1X1. Here, the center line CL refers to a line in the third direction F3 whose distance to the first edge 1X1 is the same as its distance to the second edge 1X2.

[0257] Therefore, the size of the first reserved space S1 along the third direction F3 can exceed half of the size of the cell assembly 1X along the third direction F3, thereby enabling the first reserved space S1 to accommodate more components and make fuller use of the space of the battery device 100 in the third direction F2 where the flexible bending conductive structure 5 is set, so as to reduce the occupation of other spaces and thus help improve the energy density of the battery device 100.

[0258] In some embodiments of this application, in conjunction with Figures 3, 20 and 21, Figure 21 is an enlarged view of part B circled in Figure 3. The battery device 100 includes a housing 20 for loading pouch cells 1. A reinforcing partition 2 is sandwiched between at least two adjacent cell groups 1X along a first direction F1. The stiffness of the reinforcing partition 2 is greater than the stiffness of the pouch shell 11 of the pouch cell 1. The reinforcing partition 2 has a connecting portion 23 protruding from the cell group 1X along a second direction F2. The connecting portion 23 extends into a first reserved space S1 and is connected to the housing 20.

[0259] Specifically, a reinforcing partition 2 may be sandwiched between every two adjacent cell groups 1X, or some adjacent cell groups 1X may be sandwiched between reinforcing partitions 2, while the remaining adjacent cell groups 1X may not be sandwiched between reinforcing partitions 2. The stiffness of the reinforcing partition 2 is greater than that of the soft-pack outer shell 11.

[0260] Therefore, by utilizing the characteristic that the stiffness of the reinforcing separator 2 is greater than that of the soft-pack outer shell 11, the reinforcing separator 2 can improve the deformation problem of the soft-pack cell 1. Moreover, by connecting the reinforcing separator 2 with the housing 20, the reinforcing separator 2 can more reliably and stably support the cell pack 1X, thereby improving the stability of the battery device 100.

[0261] Furthermore, since the reinforcing partition 2 is connected to the housing 20 through the connecting part 23 extending to the first reserved space S1, it can reduce the occupation of other spaces and effectively utilize the space saved by the flexible bending conductive structure 5 along the third direction F3, thereby helping to improve the energy density of the battery device 100.

[0262] In the above scheme, the soft-pack battery cell 1 may or may not be connected to the housing 20. For example, the connection can be achieved by potting glue.

[0263] In some embodiments of this application, referring to Figures 3, 20 and 21, the housing 20 includes a housing body 7 and a mounting bracket 8. The mounting bracket 8 is installed inside the housing body 7 and is located on one side of the battery cell assembly 1X in the second direction F2. The connecting part 23 is connected to the mounting bracket 8.

[0264] In the above technical solution, by setting a mounting bracket 8 inside the housing body 7 and connecting the reinforcing partition 2 to the housing 20 via the mounting bracket 8, the connection difficulty between the reinforcing partition 2 and the housing 20 can be reduced, enabling flexible installation of the reinforcing partition 2 and the housing 20. For example, the reinforcing partition 2 can be installed on the mounting bracket 8 first, and then the mounting bracket 8 can be installed inside the housing body 7; or, the mounting bracket 8 can be installed inside the housing body 7 first, and then the reinforcing partition 2 can be connected to the mounting bracket 8. Furthermore, the shape and position of the mounting bracket 8 can be flexibly configured to further reduce the connection difficulty with the reinforcing partition 2 and improve the reliability of the connection. Additionally, the material of the mounting bracket 8 can be flexibly selected to improve the reliability and stability of the mounting bracket 8 in fixing the cell array 10. Moreover, by placing the mounting bracket 8 on one side of the cell assembly 1X in the second direction F2, the connecting portion 23 of the reinforcing partition 2 protruding from the cell assembly 1X along the second direction F2 can easily approach the mounting bracket 8 and form a connection with it.

[0265] The connection method between the housing body 7 and the mounting bracket 8 is not limited; it can be a detachable connection or a non-detachable connection. The material of the mounting bracket 8 is not limited; for example, it can be made of metal to improve connection strength. The connection method between the housing body 7 and the mounting bracket 8 is not limited; for example, it can be screwed, riveted, welded, etc.

[0266] In some embodiments of this application, referring to FIG20, the edge of the connecting portion 23 on the third direction F3 near the second edge 1X2 is the first edge 231, and the edge of the mounting bracket 8 on the third direction F3 near the second edge 1X2 is the second edge 83. The first edge 231 and the second edge 83 are both located on the side of the second edge 1X2 near the first edge 1X1, so that the connecting portion 23 and the mounting bracket 8 on the side of the third direction F3 away from the first edge 1X1 form a second reserved space S2.

[0267] In the above technical solution, by forming a second reserved space S2 on the side of the connecting part 23 and the mounting bracket 8 away from the first edge 1X1 on the third direction F3, other components of the battery device 100 can be arranged in the second reserved space S2, such as wiring, thereby reducing the space occupied in other locations and improving the compactness and energy density of the battery device 100.

[0268] For example, the third direction F3 is the vertical direction, the second edge 1X2 is the upper edge of the cell assembly 1X, the first edge 1X1 is the lower edge of the cell assembly 1X, the connecting part 23 is located above the flexible bent conductive structure 5, the upper edge of the connecting part 23 is the first edge 231, the upper edge of the mounting bracket 8 is the second edge 83, and both the first edge 231 and the second edge 83 are lower than the upper edge of the cell assembly 1X (i.e. the second edge 1X2), thereby forming a second reserved space S2 above the connecting part 23 and the mounting bracket 8.

[0269] In the above technical solution, by setting the size of the connecting part 23 to be relatively small in the vertical direction, space can be formed above and below the connecting part 23. For example, the upper part can be used for wiring, and the lower part can be used for setting the flexible bending conductive structure 5. This makes full use of the vertical space at the connecting part 23 and reduces the space occupied in other positions, thereby improving the compactness and energy density of the battery device 100.

[0270] In some embodiments of this application, referring to Figures 3 and 21, one of the length direction and the width direction of the box 20 is a first direction F1, and the other is a second direction F2. The height direction of the box 20 is a third direction F3. Multiple mounting brackets 8 arranged along the first direction F1 are respectively provided at both ends of the box body 7 in the second direction F2.

[0271] In the above technical solution, since multiple battery cell groups 1X are stacked along the first direction F1, when a reinforcing partition 2 is sandwiched between two adjacent battery cell groups 1X along the first direction F1, and multiple reinforcing partitions 2 are sandwiched between multiple battery cell groups 1X stacked along the first direction F1, by setting multiple mounting brackets 8, it is convenient to flexibly connect with the multiple reinforcing partitions 2 arranged along the first direction F1, reducing the difficulty of connecting the reinforcing partitions 2 and the mounting brackets 8. Moreover, by setting the mounting brackets 8 at both ends inside the housing body 7 in the second direction F2, the difficulty of connecting the mounting brackets 8 and the housing body 7 can be reduced.

[0272] In some embodiments of this application, referring to Figures 3 and 21, the thickness direction of the pouch cell 1 is the first direction F1. The cell group 1X includes one pouch cell 1 or multiple pouch cells 1 laid flat on a plane perpendicular to the first direction F1. That is, any two pouch cells 1 in the cell group 1X including multiple pouch cells 1 are not stacked along the first direction F1, so there is no need to bend the connection position of two adjacent pouch cells 1 in the same cell group 1X, thereby saving processes and improving production efficiency. In short, the multiple pouch cells 1 in the cell group 1X do not need to introduce additional bending processes due to the need to stack along the first direction F1, thereby improving the grouping efficiency.

[0273] Therefore, regardless of whether the cell assembly 1X includes a single pouch cell 1 or multiple pouch cells 1 laid flat on a plane perpendicular to the first direction F1, the thickness of the cell assembly 1X along the first direction F1 is the same as the thickness of the thickest pouch cell 1 in the cell assembly 1X. Referring to FIG21, in some embodiments, a reinforcing partition 2 is provided between adjacent cell assemblies 1X along the first direction F1. The stiffness of the reinforcing partition 2 is greater than the stiffness of the pouch casing 11 of the pouch cell 1. The thickness direction of the reinforcing partition 2 can also be the first direction F1. The thickness T1 of the reinforcing partition 2 is less than the thickness T2 of the cell assembly 1X, and the reinforcing partition 2 is configured to exchange heat with the electrode assembly inside the pouch cell 1 through the pouch casing 11 in contact with it. In this embodiment, the reinforcing partition 2 may include the connecting part 23 or may not include the connecting part 23. It may be connected to the housing 20 or may not be connected to the housing 20. When it is connected to the housing 20 but does not include the connecting part 23, it may be connected to the housing 20 through other parts of the reinforcing partition 2.

[0274] In the above technical solution, the reinforcing partition 2 is configured to exchange heat with the electrode assembly inside the pouch cell 1 through the pouch shell 11 it contacts. That is, the reinforcing partition 2 can exchange heat with the electrode assembly inside the pouch shell 11 it contacts. It is understood that the intermediate medium for heat transfer between the reinforcing partition 2 and the electrode assembly includes, but is not limited to, the pouch shell 11, for example, the pouch shell 11 and the electrolyte (solid or liquid form).

[0275] Therefore, by utilizing the heat transfer properties of the reinforcing separator 2, it can also dissipate heat and even out the temperature of the pouch cell 1, optimizing the performance and lifespan of the pouch cell 1. Furthermore, by placing the reinforcing separator 2 between adjacent pouch cells 1, heat transfer between adjacent pouch cells 1 on both sides of the reinforcing separator 2 can be reduced, thereby improving the overall reliability of the battery device 100. In addition, since the thickness T1 of the reinforcing separator 2 is less than the thickness T2 of the cell assembly 1X, the placement of the reinforcing separator 2 does not occupy excessive space, thus facilitating the improvement of the energy density of the battery device 100.

[0276] In some embodiments of this application, the reinforcing partition 2 covers more than 80% of the total area of ​​all the pouch cells 1 in the cell assembly 1X, such as 80%, 81%, 82%, 84%, 85%, 90%, 100%, 120%, etc. That is, when projected orthographically along the first direction F1, more than 80% of the orthographic projection of the cell assembly 1X is covered by the orthographic projection of the reinforcing partition 2.

[0277] For example, the reinforcing partition 2 sandwiched between two adjacent battery cell groups 1X is an integrated structure. In this case, when the battery cell group 1X includes a plurality of pouch cells 1 laid flat on a plane perpendicular to the first direction F1, the plurality of pouch cells 1 can be at least partially covered by the same reinforcing partition 2, thereby simplifying the processing.

[0278] In the above technical solution, by setting the reinforcing partition 2 to cover more than 80% of the total area of ​​all soft-pack cells 1 in the cell pack 1X, the cell pack 1X and the reinforcing partition 2 can have a large heat transfer surface and support surface, so that the reinforcing partition 2 can play a better supporting, heat transfer and separation role for the cell pack 1X.

[0279] In some embodiments, the reinforcing partition 2 is bonded to the cell assembly 1X. For example, the reinforcing partition 2 can be fixed to the soft-pack outer shell 11 of the adjacent soft-pack cell 1 by adhesive, wherein the adhesive method is not limited, for example, it can be glued or double-sided tape.

[0280] Therefore, the reinforcing separator 2 is bonded to the adjacent cell assembly 1X, making the connection simple and reliable, and allowing the reinforcing separator 2 to exchange heat stably with the cell assembly 1X. In addition, the adhesive layer occupies less space, allowing the reinforcing separator 2 and the cell assembly 1X to be arranged compactly, thus making the overall structure of the cell array 10 more compact and stable, which is beneficial to improving the battery energy density.

[0281] For example, the reinforcing partition 2 is bonded and fixed to the cell assembly 1X by double-sided adhesive. For instance, during the assembly of the cell array 10, double-sided adhesive can be applied between the cell assembly 1X and the reinforcing partition 2. For example, the double-sided adhesive can be first bonded and fixed to one of the cell assembly 1X and the reinforcing partition 2, and then bonded to the other, thereby achieving the bonding and fixing of the cell assembly 1X and the reinforcing partition 2 by double-sided adhesive.

[0282] Therefore, by bonding the reinforcing partition 2 to the adjacent cell assembly 1X with double-sided adhesive, the problem of adhesive overflow can be avoided, the space occupied by the overflowing adhesive can be avoided, and the subsequent cleaning process of the overflowing adhesive can be eliminated.

[0283] In some embodiments, a cavity is formed within the reinforcing partition 2. That is, the reinforcing partition 2 is not a solid structure. It is worth noting that the cavity may or may not be filled with a medium. When filled with a medium, it may be filled with a buffer medium for absorbing force, or it may be filled with a heat transfer medium for absorbing heat, etc.

[0284] In the above technical solution, by setting a cavity within the reinforcing partition 2, the reinforcing partition 2 can absorb the expansion force of the battery cell assembly 1X using the cavity, that is, provide expansion space, avoiding excessive compression of the battery cell assembly 1X when it expands too much, thus improving the reliability of the battery cell array 10. Moreover, when the battery cell array 10 is subjected to some collisions, the cavity can absorb the collision force, protecting the battery cell assembly 1X.

[0285] In some embodiments, the cavity includes heat exchange channels for distributing the heat exchange medium. That is, some cavities can circulate or store the heat exchange medium. In this case, the reinforcing partition 2 can exchange heat with the battery cell assembly 1X using its own material, or it can exchange heat with the battery cell assembly 1X through the heat exchange medium in the heat exchange channels, or it can simultaneously exchange heat with the battery cell assembly 1X using both the material of the reinforcing partition 2 itself and the heat exchange medium in the heat exchange channels, thereby enabling flexible design of the reinforcing partition 2.

[0286] In the above technical solution, the reinforcing separator 2 can exchange heat with the cell assembly 1X using the heat exchange medium in the heat exchange channel. By selecting and controlling the heat exchange medium, the thermal management performance of the reinforcing separator 2 on the cell assembly 1X can be optimized. Furthermore, the heat exchange channel can be connected to an external thermal management system, allowing the heat exchange medium to circulate and its temperature to be controlled. In this case, the reinforcing separator 2 can integrate liquid cooling heat exchange functionality, reducing the need for additional heat exchange structures, thereby simplifying the battery device 100, reducing the number of components, and increasing the energy density of the battery device 100.

[0287] In some embodiments of this application, referring to FIG22, multiple reinforcing partitions 2 are sandwiched between multiple battery cell groups 1X stacked along the first direction F1, and only one reinforcing partition 2 is sandwiched between each pair of adjacent battery cell groups 1X. The two reinforcing partitions 2 arranged adjacently along the first direction F1 are connected by a connecting plate 6 located on the side of the battery cell group 1X in the third direction F3. That is, the connecting plate 6 is located on the side of the battery cell group 1X in the third direction F3 and connects the two reinforcing partitions 2 arranged adjacently along the first direction F1.

[0288] Therefore, by setting two reinforcing partitions 2 adjacent to each other along the first direction F1 and connecting them through a connecting plate 6 located on the side of the cell assembly 1X in the third direction F3, the reliability of the reinforcing partitions 2 in supporting the soft-pack cell 1 can be improved. Moreover, the setting position of the connecting plate 6 does not interfere with the cell assembly 1X, nor does it interfere with the flexible bending conductive structure 5 located in the second direction F2.

[0289] Among them, the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other. For example, the first direction F1 is the thickness direction of the soft-pack battery cell 1, the second direction F2 is the length direction of the soft-pack battery cell 1, and the third direction F3 is the width direction of the soft-pack battery cell 1.

[0290] In this configuration, each pair of adjacent reinforcing partitions 2 can be connected by a connecting plate 6, or some pairs of adjacent reinforcing partitions 2 can be connected by a connecting plate 6 while others cannot. The reinforcing partitions 2 and the connecting plate 6 can be assembled together or integrally formed.

[0291] For example, referring to Figure 22, the connecting plate 6 is disposed between the two reinforcing partitions 2 to which it is connected, and the connecting plate 6 and the two reinforcing partitions 2 to which it is connected form a U-shaped shell.

[0292] In some embodiments, a reinforcing partition 2 is provided between every two adjacent cell groups 1X along the first direction F1. Therefore, by providing a reinforcing partition 2 between every two adjacent cell groups 1X along the first direction F1, each cell group 1X can receive support and heat exchange from the reinforcing partition 2, thereby more fully optimizing the reliability and performance of the cell array 10. Of course, this application is not limited to this; for example, in other embodiments of this application, the reinforcing partition 2 may not be provided between some adjacent cell groups 1X along the first direction F1.

[0293] In some embodiments, referring to FIG21, a buffer 3 is sandwiched between at least two adjacent cell groups 1X along the first direction F1, the stiffness of the buffer 3 being less than the stiffness of the soft-pack outer shell 11.

[0294] Therefore, by setting a buffer 3 between two adjacent cell groups 1X, and the stiffness of the buffer 3 is less than that of the soft-pack shell 11, the buffer 3 can provide expansion space to the cell group 1X, so that the buffer 3 can effectively absorb the expansion deformation of the cell group 1X and the vibration under external impact, etc., making the overall structural stability of the battery device 100 better.

[0295] The material of the buffer 3 is not limited; for example, it can be a foam layer or a silicone layer. Buffers made of these materials have better absorption capacity and are relatively lightweight and low-cost, which is beneficial for the lightweight and low-cost design of the battery device 100. Exemplarily, the cell assembly 1X and the buffer 3 can be bonded together or abutted together. For example, they can be bonded using adhesive or double-sided tape. When using double-sided tape, the problem of adhesive overflow can be avoided.

[0296] In some embodiments, referring to FIG21, when a reinforcing partition 2 is sandwiched between at least two adjacent cell groups 1X along the first direction F1, and a buffer 3 is sandwiched between at least two adjacent cell groups 1X along the first direction F1, multiple reinforcing partitions 2 and multiple buffers 3 can be sandwiched between multiple cell groups 1X stacked along the first direction F1, with each cell group 1X sandwiched between the buffer 3 and the reinforcing partition 2. Thus, the arrangement of the reinforcing partitions 2 and the buffers 3 is more balanced, and each cell group 1X can obtain stable and reliable support, heat exchange, and buffering effects.

[0297] Of course, this application is not limited to this. For example, a buffer 3 may be provided between every two adjacent battery cell groups 1X along the first direction F1. Or, for example, a reinforcing partition 2 and a buffer 3 may be provided simultaneously between two adjacent battery cell groups 1X, etc.

[0298] In some embodiments, the buffer 3 covers more than 80% of the total area of ​​all the pouch cells 1 in the cell assembly 1X, such as 80%, 81%, 82%, 84%, 85%, 90%, 100%, 120%, etc. That is, when projected orthographically along the first direction F1, more than 80% of the orthographic projection of the cell assembly 1X is covered by the orthographic projection of the buffer 3.

[0299] For example, the buffer 3 sandwiched between two adjacent battery cell groups 1X is an integrated structure. In this case, when the battery cell group 1X includes a plurality of soft-pack battery cells 1 laid flat on a plane perpendicular to the first direction F1, the plurality of soft-pack battery cells 1 can be at least partially covered by the same buffer 3, thereby simplifying the processing.

[0300] In the above technical solution, by setting the buffer 3 to cover more than 80% of the total area of ​​all soft-pack cells 1 in the cell group 1X, the cell group 1X and the buffer 3 can form a large buffering area, thereby improving the buffering effect of the buffer 3 on the cell group 1X, enabling the cell group 1X to be buffered to a greater extent and improving the reliability of the cell group 1X.

[0301] In some embodiments, referring to Figures 23 and 24, the soft-pack housing 11 includes two membrane portions 111 arranged and connected along the thickness direction of the soft-pack battery cell 1. Each membrane portion 111 defines a receiving groove. The receiving grooves of the two membrane portions 111 open toward each other along the thickness direction of the soft-pack battery cell 1 and together form the receiving cavity of the soft-pack housing 11. The electrode assembly is disposed in the receiving cavity. The wall thickness of the membrane portion 111 is less than or equal to 0.2 mm.

[0302] In this embodiment, the wall thickness of the membrane portion 111 is less than or equal to 0.2 mm. For example, the wall thickness of the membrane portion 111 can be 0.2 mm, 0.19 mm, 0.17 mm, 0.15 mm, 0.1 mm, etc. By setting the wall thickness of the membrane portion 111 to less than or equal to 0.2 mm in this embodiment, the volume ratio of the soft-pack outer shell 11 in the soft-pack battery cell 1 is smaller and the weight is lighter, and the volume and weight ratio of the electrode assembly in the soft-pack battery cell 1 is larger, thereby significantly improving the energy density of the soft-pack battery cell 1.

[0303] For example, the electrode assembly consists of a positive electrode, a negative electrode, and a separator. The pouch cell 1 mainly relies on the movement of metal ions between the positive and negative electrode to operate. The positive electrode includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector.

[0304] For example, the soft-pack outer shell 11 can be an aluminum-plastic film. The two film portions 111 connected in the thickness direction of the soft-pack battery cell 1 can be formed by punching grooves in the aluminum-plastic film substrate. Both film portions 111 define receiving grooves, so the soft-pack outer shell 11 can be formed by double punching. For example, during the production and processing of the soft-pack battery cell 1, the soft-pack outer shell 11 can form two film portions 111 with receiving grooves by double punching. The electrode assembly is arranged in the receiving groove of one of the film portions 111, and the other film portion 111 is folded towards the film portion 111 that accommodates the electrode assembly, so that the two receiving grooves cooperate to form a receiving cavity. The soft-pack battery cell 1 then undergoes subsequent production processes such as edge sealing and liquid injection. The two film portions 111 form a sealed receiving cavity by edge sealing, thereby forming a complete soft-pack outer shell 11.

[0305] In some embodiments, referring to Figures 23 and 24, the dimension of the pouch cell 1 in the thickness direction is a first dimension H1, and the dimension of any one of the film portions 111 in the thickness direction is a second dimension H2. Since the pouch cell 1 is composed of two film portions 111 forming the pouch shell 11, and the overall dimension of the two film portions 111 in the thickness direction of the pouch cell 1 is the first dimension H1, the sum of the second dimensions H2 of the two film portions 111 is equal to the first dimension H1. The second dimensions H2 of the two film portions 111 can be set to be the same or different as needed.

[0306] In some embodiments, the first dimension H1 is greater than or equal to 5 mm and less than or equal to 70 mm, such as 5 mm, 6 mm, 10 mm, 12 mm, 17 mm, 25 mm, 30 mm, 40 mm, 47 mm, 53 mm, 60 mm, 65 mm, 70 mm, etc. The ratio of the second dimension H2 to the first dimension H1 is greater than or equal to 0.4 and less than or equal to 0.6, such as 0.6, 0.55, 0.5, 0.48, 0.46, 0.45, 0.4, etc.

[0307] The first dimension H1 is set to be greater than or equal to 5mm and less than or equal to 70mm, which makes the thickness of the soft-pack cell 1 thicker. This, combined with the thinner soft-pack outer shell 11, allows the soft-pack cell 1 to have a higher energy density. Furthermore, the thickness of the soft-pack cell 1 can be flexibly set within a wide range as needed, so that the soft-pack cell 1 can better meet the usage needs of battery devices 100 of different sizes and specifications.

[0308] In this embodiment, the ratio of the second dimension H2 to the first dimension H1 is set to be greater than or equal to 0.4 and less than or equal to 0.6, so that the dimensions of the two membrane portions 111 in the first direction F1 can be relatively consistent, and both membrane portions 111 can maintain sufficient mechanical strength to meet the molding requirements of the soft-pack shell 11. Thus, when the first dimension H1 of the soft-pack battery cell 1 in this embodiment is set to be greater than or equal to 5 mm and less than or equal to 70 mm, a stable and reliable soft-pack shell 11 is formed.

[0309] In this embodiment, by setting the thickness of the soft-pack outer shell 11 to less than 0.2 mm, the ratio of the second dimension H2 to the first dimension H1 of any membrane portion 111 is greater than or equal to 0.4 and less than or equal to 0.6, and the first dimension H1 is greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack cell 1 can have a larger thickness and a higher energy density. In the same volume, compared to multiple thinner soft-pack cells 1, the number of soft-pack cells 1 arranged in this embodiment is smaller, thereby reducing the proportion of the soft-pack outer shell 11 and allowing multiple soft-pack cells 1 within the same volume to have a greater energy density. Furthermore, it can reduce the number of structural components such as the reinforcing separator 2 and the buffer 3 in the battery device 100, increasing the arrangement space of the soft-pack cells 1 in the battery device 100, thereby significantly improving the overall energy density of the battery device 100.

[0310] In this embodiment, when the pouch cell 1 is assembled in the battery device 100, the battery device 100 can achieve a greater energy density with fewer pouch cells 1 in the same arrangement space. Furthermore, due to the reduction in the number of pouch cells, the number of supporting structures and structural components such as heat conduction and bonding for supporting the pouch cell 1 is also significantly reduced. This allows for a larger space in the battery device 100 to arrange the pouch cells 1, thereby greatly improving the overall energy density of the battery device 100.

[0311] For example, the ratio of the second dimension H2 to the first dimension H1 can be greater than or equal to 0.45 and less than or equal to 0.55. For instance, the ratio of the second dimension H2 to the first dimension H1 can be 0.45, 0.46, 0.48, 0.49, 0.5, 0.51, 0.53, 0.55, etc. This makes the dimensions of the two membrane portions 111 more consistent in the first direction F1, facilitating manufacturing, ensuring that the receiving grooves of both membrane portions 111 have sufficient depth for the arrangement of electrode assemblies, and maintaining relatively consistent mechanical strength between the two membrane portions 111. This makes the overall structure of the soft-pack housing 11 more stable and reliable, thereby enabling the soft-pack battery cell 1 to operate and be used stably and reliably.

[0312] For example, the ratio of the second dimension H2 to the first dimension H1 can be 0.5. That is, the two membrane portions 111 have the same dimension in the first direction F1, the two membrane portions 111 can form a symmetrical structure, and the receiving grooves of the two membrane portions 111 are also the same size. In other words, by setting the ratio of the second dimension H2 to the first dimension H1 to 0.5, the two membrane portions 111 can have the same structural construction, thereby making the processing and molding of the soft-pack shell 11 more convenient, and enabling the two membrane portions 111 to have consistent mechanical strength and structural performance, thereby improving the overall structural stability and reliability of the soft-pack shell 11, and making the soft-pack battery cell 1 more stable.

[0313] For example, the first dimension H1 is greater than or equal to 15mm and less than or equal to 45mm, such as 15mm, 16mm, 20mm, 25mm, 35mm, 40mm, 42mm, 45mm, etc. This allows the pouch cell 1 to have a relatively large thickness, which significantly improves the energy density of the battery device 100 and reduces the probability of decreased structural stability caused by excessive thickness. This ensures the pouch cell 1 has a suitable thickness for stable and reliable operation.

[0314] For example, the second dimension H2 is greater than or equal to 3 mm and less than or equal to 35 mm. For example, 3 mm, 5 mm, 6 mm, 8 mm, 15 mm, 30 mm, 35 mm, etc. In this embodiment, the second dimension H2 is set to be greater than or equal to 3 mm and less than or equal to 35 mm, so that the two film portions 111 can cooperate to form the soft-pack outer shell 11 of the required thickness for the soft-pack battery, thus meeting the setting requirements of the soft-pack cell 1.

[0315] For example, the second dimension H2 is greater than or equal to 7 mm and less than or equal to 22 mm. For example, 7 mm, 8 mm, 10 mm, 12 mm, 15 mm, 20 mm, 22 mm, etc. In this embodiment, the second dimension H2 is set to be greater than or equal to 7 mm and less than or equal to 22 mm, so that the membrane portion 111 has a more suitable size in the first direction F1, thereby enabling the membrane portion 111 to have good mechanical strength and structural stability, thus making the overall structure of the soft-pack housing 11 more stable and reliable, and enabling the electrode assembly to be stably and reliably arranged in the receiving cavity, thereby making the soft-pack battery cell 1 work more stably.

[0316] During the processing of the pouch cell 1, the two membrane portions 111 can be sealed by an edge sealing process to seal the cavity. For example, the edges of the two membrane portions 111 can be connected by hot pressing, cold pressing, welding, etc., so that the circumferential cavity is sealed.

[0317] In some embodiments, the two membrane portions 111 are separate components with four sealed edges, and both membrane portions 111 are separate components with sealing structures 112 around the perimeter of the pouch cell 1. Therefore, a single membrane portion 111 is easy to process, reducing processing difficulty.

[0318] In some embodiments, the two membrane portions 111 are integral and have three sides sealed. The two membrane portions 111 are integral and each has a sealing structure 112 on one long side and two wide sides around the pouch cell 1. This reduces the number of sealing operations and decreases the overall width dimension of the pouch cell 1, thereby increasing energy density. Furthermore, the absence of sealing on all four sides avoids leakage problems caused by inadequate sealing on the side where sealing is omitted, improving the reliability of the pouch cell 1.

[0319] In some embodiments, referring to Figures 19 and 25-27, the battery device 100 includes a cell array 10, which includes multiple cell groups 1X stacked along a first direction F1. The battery device 100 includes a housing 20 for housing the cell array 10. One of the length direction and the width direction of the housing 20 is the first direction F1, and the other is the second direction F2. The thickness direction of the pouch cell 1 is the first direction F1, the second direction F2 is the length direction of the pouch cell 1, and the width direction of the pouch cell 1 is consistent with the height direction of the housing 20 (e.g., the third direction F3 shown in the figures). The housing 20 includes cover plates 71 disposed on both sides of the cell array 10 along the height direction of the housing 20. Thus, by arranging the pouch cells 1 as described above, the uniformity of the force on each pouch cell 1 can be improved, which is beneficial to the heat dissipation of each pouch cell 1.

[0320] For example, at least one cover plate 71 exchanges heat with the cell array 10. Thus, by arranging the pouch cells 1 as described above, each pouch cell 1 can effectively exchange heat with the cover plate 71, improving the consistency and uniformity of temperature regulation of each pouch cell 1 by the cover plate 71, thereby improving the operational stability and reliability of the cell array 10, and ultimately enhancing the performance of the battery device 100. The heat exchange between the cover plate 71 and the cell array 10 can be direct or indirect.

[0321] In some embodiments, the width direction of the pouch cell 1 is aligned with the height direction of the housing 20, and structural adhesive is used to fill the space between the cell array 10 and the cover plate 71. This improves the rigidity of the pouch cell 1 along the height direction of the housing 20. For example, the structural adhesive is a thermally conductive adhesive, which can transfer heat between the cover plate 71 and the cell array 10, thereby facilitating heat dissipation of the pouch cell 1.

[0322] In some embodiments, referring to FIG28, the housing 20 is provided with a baffle strip 9, and the cover plate 71 includes a bottom plate 711 located below the cell array 10. A mating gap is formed between the bottoms of two adjacent soft-pack cells 1 arranged along the first direction F1, and the baffle strip 9 is located between the mating gap and the bottom plate 711.

[0323] In the above technical solution, the adhesive-blocking strip 9 can prevent the structural adhesive from overflowing between adjacent soft-pack cells, reducing the probability of adjacent soft-pack cells forming a rigid structure due to adhesive overflow. This can improve the problem of local stress concentration between adjacent soft-pack cells and reduce the risk of damage to the soft-pack cells.

[0324] For example, the adhesive strip 9 can avoid the bottom of the soft-pack battery cell 1 directly below, so that a heat-conducting area can be formed between the bottom of the soft-pack battery cell 1 and the base plate 711.

[0325] In some embodiments, two adjacent pouch cells 1 share a single adhesive strip 9.

[0326] In the above technical solution, by having two adjacent soft-pack cells 1 share a single adhesive strip 9, the number of adhesive strips 9 can be reduced, which is beneficial to improving assembly efficiency.

[0327] In some embodiments, the adhesive strip 9 is adhesive-blocking foam, and the adhesive strip 9 is bonded to the base plate 711; or, the adhesive strip 9 is a strip with adhesive on one side, and the adhesive strip 9 is bonded to the bottom of the soft-pack battery cell 1.

[0328] In the above technical solution, the adhesive-blocking foam has good compressibility. By squeezing the adhesive-blocking strip 9 by the soft-pack battery cell 1, the structural adhesive can be better prevented from overflowing between adjacent soft-pack battery cells, and the adhesive-blocking strip 9 can be bonded to the base plate 711, which facilitates the installation and fixing of the adhesive-blocking strip 9; or, by setting the adhesive-blocking strip 9 as an adhesive strip with adhesive on one side, it is convenient to bond the adhesive-blocking strip 9 to the bottom of the soft-pack battery cell 1, so that the adhesive-blocking strip 9 and the soft-pack battery cell 1 are fixed into a whole, thereby facilitating the improvement of the overall assembly efficiency of the battery device 100.

[0329] In some embodiments, the battery device 100 further includes a heat exchange plate 30 disposed between the cell array 10 and at least one cover plate 71. Thus, the cell array 10 can exchange heat with the heat exchange plate 30. When the battery device 100 is operating, the heat generated by each pouch cell 1 in the cell array 10 is dissipated through the heat exchange plate 30. When the cell array 10 needs to be heated, the heat exchange plate 30 can transfer heat to each pouch cell 1 in the cell array 10.

[0330] Therefore, by setting up the heat exchange plate 30, the temperature regulation effect on the battery cell stack 10 can be optimized through the design of the heat exchange plate 30. For example, the heat exchange plate 30 can be made of a material with good heat transfer properties, and a heat exchange medium can be arranged inside the heat exchange plate 30 to optimize the temperature regulation effect of the heat exchange plate 30 on the battery cell stack 10.

[0331] For example, referring to Figures 19 and 25-27, the housing 20 includes a top plate 712 and a bottom plate 711 disposed on the upper and lower sides of the cell array 10 along the height direction of the housing 20. The heat exchange plate 30 can be a liquid cooling plate. The heat exchange plate 30 is arranged between the cell array 10 and the bottom plate 711. When the battery device 100 is working, the heat generated by the multiple pouch cells 1 in the cell array 10 is dissipated through the heat exchange plate 30. When the cell array 10 needs to be heated, the heat exchange plate 30 can transfer the heat to the pouch cells 1 in the cell array 10.

[0332] Of course, this application is not limited to this. For example, the heat exchange plate 30 can also be arranged between the cell stack 10 and the top plate 712. Alternatively, the heat exchange plate 30 can be arranged between the cell stack 10 and the top plate 712, and also between the cell stack 10 and the bottom plate 711.

[0333] It is worth noting that when the heat exchange plate 30 is located between the battery cell array 10 and the cover plate 71, structural adhesive may or may not be used to fill the space between the battery cell array 10 and the cover plate 71. When structural adhesive is used, it can be used both between the cover plate 71 and the heat exchange plate 30 and between the heat exchange plate 30 and the battery cell array 10, thereby improving the installation stability of the heat exchange plate 30. When the structural adhesive is a thermally conductive adhesive, it can improve the heat exchange performance between the heat exchange plate 30 and the battery cell array 10, as well as the heat exchange performance between the cover plate 71 and the heat exchange plate 30.

[0334] In some embodiments of this application, the soft-pack cell 1 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0335] Solid-state battery cells can be, but are not limited to, polymer solid-state battery cells, oxide solid-state battery cells, sulfide solid-state battery cells, halide solid-state battery cells, etc. Solid-state battery cells can also be semi-solid-state battery cells or all-solid-state battery cells.

[0336] In the above technical solutions, the use of the aforementioned types of pouch cells 1 provides more options for the design of battery devices to meet different application needs. Specifically, pouch cell 1 is a lithium iron phosphate battery cell, which has advantages such as high reliability, long cycle life, light weight, large capacity, and low internal resistance; pouch cell 1 is a ternary lithium battery cell, which has advantages such as high energy density and good electrochemical performance; and pouch cell 1 is a solid-state battery cell, which has advantages such as high energy density, high reliability, light weight, and good high and low temperature performance.

[0337] In some embodiments of this application, the soft-pack cell 1 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 soft-pack cell 1 is 96:(1-3):(1-3); the soft-pack cell 1 is a ternary battery cell, and the ratio of the amount of the amount of positive active material, binder and conductive agent in the positive electrode material of the soft-pack cell 1 is 96:(2-3):(1-2).

[0338] For example, the soft-pack cell 1 is a lithium iron phosphate battery cell, and the preferred ratio of the positive electrode active material, binder and conductive agent in the positive electrode material of the soft-pack cell 1 is LFP:PVDF:conductive carbon black = 96:2:2; LFP generally refers to LiFePO4.

[0339] For example, the soft-pack cell 1 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 soft-pack cell 1 is preferably octane LiNi0.8Co0.1Mn0.1O2, and the ratio is preferably 96:2.5:1.5.

[0340] In some embodiments, the positive electrode of the pouch cell 1 can be a positive electrode sheet, which can 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 active material.

[0341] 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.

[0342] 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.).

[0343] As an example, when the pouch cell 1 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 pouch cell 1. 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.

[0344] 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.

[0345] Layered transition metal oxides include those with the general formula Li a Ni b Co c M d O e A f At 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.

[0346] 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 NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM)622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 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.

[0347] When the soft-pack battery cell 1 in this application 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.

[0348] 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, Na 2 / 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 information, 0 < p ≤ 4, 0 < q ≤ 2, 1 ≤ r ≤ 3, 0 ≤ x ≤ 2, X includes at least one of H+, Li+, Na+, K+ and NH4+, 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.

[0349] 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.

[0350] During the charging and discharging process, the soft-pack battery cell 1 undergoes the insertion and extraction of active ions such as Li, resulting in a different molar content of Li when the soft-pack battery cell 1 is discharged to different 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.

[0351] 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.

[0352] 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.

[0353] 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.

[0354] 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%.

[0355] 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%.

[0356] 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.

[0357] 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.

[0358] 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.

[0359] 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 aluminum or stainless steel with a silver surface treatment, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, 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 alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0360] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in pouch cells. 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.

[0361] In some embodiments, the negative electrode active material includes silicon, which can 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 pouch cell.

[0362] 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 pouch cell 1 system, when the mass content of silicon is within the above range, the energy density of the pouch cell 1 can be improved.

[0363] 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.

[0364] 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%.

[0365] 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%.

[0366] 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%.

[0367] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] Porous base membranes may include one or more of polyethylene and polypropylene.

[0373] 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.

[0374] 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.

[0375] 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.

[0376] In some embodiments, the pouch cell 1 further includes an electrolyte.

[0377] During the charging and discharging process of a single 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.

[0378] 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.

[0379] 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.

[0380] 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.

[0381] It is understandable that when the pouch cell 1 is a lithium iron phosphate battery 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.).

[0382] For example, when the soft-pack cell 1 is a lithium iron phosphate battery 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.

[0383] When the pouch cell 1 is a ternary lithium battery cell, in the positive electrode material of the pouch cell 1, 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, including but 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, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). The ternary lithium battery cell can be, but is not limited to, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, etc.

[0384] For example, the ternary material of the ternary battery cell can be an octet LiNi. 0.8 Co 0.1 Mn 0.1 The 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.

[0385] In the above technical solutions, when the pouch cell 1 is a lithium iron phosphate battery 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 battery 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 the amount of binder and conductive agent can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the pouch cell 1 is a ternary battery 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 to 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 to reduce the risk of active material shedding and electrode pulverization during charging and discharging, and extends the cycle life of the battery device 100.

[0386] In some embodiments of this application, the polarities of the two electrode terminals 12 constituting the connection are the same or opposite, so that multiple cell groups 1X can be connected in series and / or in parallel. Thus, series and / or parallel connections can be implemented as needed, allowing for flexible configuration of the battery device 100. For example, both electrode terminals 12 constituting the connection can be positive, thereby enabling parallel connection between pouch cells 1 by connecting electrode terminals 12 with the same polarity; or, for another example, one of the two electrode terminals 12 constituting the connection is positive and the other is negative, thereby enabling series connection between pouch cells 1 by connecting electrode terminals 12 with opposite polarities.

[0387] In some embodiments of this application, all the pouch cells 1 in the battery device 100 are connected in series and / or in parallel to form a cell module 101 (as shown in FIG3, for example), and the cell module 101 outputs a positive terminal and a negative terminal.

[0388] Secondly, embodiments of this application also provide an electrical device, including a battery device 100 of any of the above-described solutions.

[0389] In the above technical solution, the assembly efficiency of the battery device 100 can be improved, which helps to reduce the manufacturing cost of the power-consuming device.

[0390] Thirdly, this application embodiment also provides a method for processing a battery device 100, wherein the battery device 100 includes a plurality of pouch cells 1, and electrode terminals 12 extend from both ends of the pouch cells 1. Referring to FIG29, the processing method includes: step S1, connecting the plurality of pouch cells 1 along the extension direction of the electrode terminals 12 to form a battery cell string, the battery cell string being divided into a plurality of battery cell groups 1X arranged sequentially along the arrangement direction of the plurality of pouch cells, each battery cell group 1X including at least one pouch cell 1, and each two adjacent pouch cells 1 in the battery cell string being connected through adjacent electrode terminals 12 to form a conductive structure 4; step S2, bending the two conductive structures 4 at both ends of each battery cell group 1X in opposite directions, so that the two battery cell groups 1X connected to the battery cell group 1X are stacked on both sides of the thickness direction of the battery cell group 1X.

[0391] The electrode terminal 12 extends in a direction perpendicular to the thickness direction of the pouch cell 1. For example, the extension direction of the electrode terminal 12 is set as a second direction F2, which is perpendicular to the thickness direction of the pouch cell 1, and the thickness direction of the pouch cell 1 is set as a first direction F1. Exemplarily, the second direction F2 can be the length direction of the pouch cell 1, but it is not limited to this. For example, the second direction F2 can also be the width direction of the pouch cell 1.

[0392] Therefore, by the above method, multiple cell groups 1X can be stacked along the first direction F1. Each cell group 1X located between the two ends of the first direction F1 has one end electrically connected along the second direction F2 to the cell group 1X upstream of the first direction F1 via a flexible bending conductive structure 5, and the other end along the second direction F2 is electrically connected to the cell group 1X downstream of the first direction F1 via the same flexible bending conductive structure 5. In this technical solution, the cell array 10 has high grouping efficiency, and the battery device 100 has high processing efficiency, thereby reducing the manufacturing cost of the battery device 100.

[0393] Since "multiple pouch cells 1 are connected together in a string along the extension direction of electrode terminals 12", one pouch cell 1 in the string is located on one side of the extension electrode terminal 12 of an adjacent pouch cell 1, thus the electrode terminal 12 can be located between two adjacent pouch cells 1. It is worth noting that the multiple pouch cells 1 in a string are not limited to a flat arrangement; that is, one surface of each pouch cell 1 in the thickness direction does not need to be coplanar. They can be coplanar or non-coplanar.

[0394] The two electrode terminals 12 connected together can be directly connected or indirectly connected.

[0395] The specific features of the battery device 100 described in the third aspect can be found in the description of the battery device 100 in the first aspect, and will not be repeated here.

[0396] In some embodiments of this application, referring to FIG30, the step S1 of connecting multiple soft-pack battery cells 1 along the extension direction of electrode terminals 12 to form a battery cell string may specifically include: step S11, laying multiple soft-pack battery cells 1 flat in a row along the extension direction of electrode terminals 12 (for example, as shown in FIG8); step S12, connecting the electrode terminals 12 at adjacent positions of every two adjacent soft-pack battery cells 1. In the above technical solution, every two adjacent soft-pack battery cells 1 in the multiple soft-pack battery cells 1 laid flat in a row can be connected simultaneously, thereby improving processing efficiency. Here, "laid flat" means that one side surface of each soft-pack battery cell 1 laid flat in a row is coplanar in the thickness direction.

[0397] Of course, this application is not limited to this. For example, in other embodiments of this application, two pouch cells 1 can be connected together through electrode terminals 12 first, and then the next pouch cell 1 can be connected to obtain a string of cells. Alternatively, multiple cell groups 1X can be connected into units first, and then multiple units can be connected to obtain a string of cells.

[0398] In some embodiments of this application, referring to FIG31, the step S1 of connecting multiple pouch cells 1 into a string of cells along the extension direction of the electrode terminals 12 may specifically include: step S121, overlapping and welding the electrode terminals 12 of adjacent positions of every two adjacent pouch cells 1. Thus, by overlapping and welding the adjacent electrode terminals 12 of two adjacent pouch cells 1, direct connection of adjacent pouch cells 1 can be achieved, thereby further improving processing efficiency. Furthermore, the conductivity between the overlapping and welded electrode terminals 12 is reliable, not only eliminating the need for conductive components but also improving the stability and reliability of the power supply.

[0399] For example, in step S12 above, connecting the electrode terminals 12 at adjacent positions of two adjacent pouch cells 1 can be specifically done as follows: Step S121, overlapping and welding the electrode terminals 12 at adjacent positions of two adjacent pouch cells 1.

[0400] Of course, this application is not limited to this. For example, the two electrode terminals 12 connected together can also be connected by a flexible conductive sheet, or overlapped and bonded, etc.

[0401] In summary, according to a specific embodiment of the battery device 100 of this application, the soft-pack battery cell 1 is configured with electrode terminals 12 extending from both ends of its length, and the electrode terminals 12 of two adjacent soft-pack battery cells 1 are directly welded together. Multiple soft-pack battery cells 1 are connected to form a row arranged along the second direction F2. The multiple soft-pack battery cells 1 are grouped, that is, one or more adjacent soft-pack battery cells 1 are divided into a cell group 1X. Multiple cell groups 1X are arranged sequentially along the second direction F2, and then the grouped cells are folded. That is, the flexibility of the electrode terminals 12 at the direct welding connection position of the electrode terminals 12 is used to bend the welding positions at both ends of each group along the second direction F2, so as to obtain multiple cell groups 1X that are connected end to end and stacked along the first direction F1. The multiple cell groups 1X stacked in this way constitute a cell row 10. Then, the grouped cell rows 10 can be installed into the housing 20 as a whole, thereby effectively improving the production efficiency of the battery device 100.

[0402] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0403] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, wherein, include: Multiple cell groups are stacked along a first direction, and each cell group includes at least one pouch cell. Each of the battery cells located between the two ends of the first direction has one end electrically connected to the battery cell group upstream of the first direction along the second direction, and the other end electrically connected to the battery cell group downstream of the first direction along the second direction. The connection points of the two interconnected battery cell groups form a flexible bent conductive structure, with the first direction and the second direction arranged at an angle.

2. The battery device according to claim 1, wherein, The thickness direction of the pouch cell is the first direction, and the cell assembly includes one pouch cell or multiple pouch cells laid flat on a plane perpendicular to the first direction.

3. The battery device according to claim 2, wherein, The multiple pouch cells in the battery pack are arranged in a flat manner along the second direction, and adjacent pouch cells are connected at adjacent positions.

4. The battery device according to claim 1, wherein, The battery device includes a first cell array, which includes a plurality of cell groups stacked along a first direction, wherein each cell group in the first cell array includes one pouch cell.

5. The battery device according to claim 4, wherein, The first direction is the thickness direction of the pouch cell, the second direction is the length direction of the pouch cell, and the ends of two adjacent pouch cells on the same side are connected by the flexible bending conductive structure.

6. The battery device according to claim 5, wherein, In the first cell array, each of the pouch cells has the same length and the same width.

7. The battery device according to claim 5 or 6, wherein, The battery device includes a plurality of the first cell arrays arranged along the second direction.

8. The battery device according to claim 7, wherein, Two first cell rows arranged adjacent to each other along the second direction are connected by an inter-row conductive structure.

9. The battery device according to claim 8, wherein, In two first cell rows arranged adjacent to each other in the second direction, the adjacent ends of two cell groups located at the ends in the first direction and opposite to each other in the second direction are connected by the inter-row conductive structure.

10. The battery device according to claim 1, wherein, The battery device includes a second cell array, which includes a plurality of cell groups stacked along a first direction, wherein at least one cell group in the second cell array includes a plurality of pouch cells.

11. The battery device according to claim 10, wherein, The first direction is the thickness direction of the pouch cell, and all the pouch cells in the cell group including multiple pouch cells are laid flat on a plane perpendicular to the first direction.

12. The battery device according to claim 10 or 11, wherein, The second direction is the length direction of the pouch cell. The pouch cells included in the cell group in the second cell row are arranged along the second direction. The adjacent ends of two adjacent pouch cells are connected by a conductive structure. The conductive structure located at the end of the cell group along the second direction is a flexible structure and is bent to form the flexible bent conductive structure.

13. The battery device according to claim 12, wherein, The total length of each cell group in the second cell bank is consistent along the second direction.

14. The battery device according to any one of claims 10-13, wherein, Each of the cell groups in the second cell array includes the same shape, the same arrangement, and the same number of pouch cells.

15. The battery device according to any one of claims 1-14, wherein, The second direction is the length direction of the pouch cell. Electrode terminals extend from both ends of the pouch cell along its length direction. Adjacent pouch cells are connected through adjacent electrode terminals. The cell group includes one pouch cell or multiple pouch cells arranged sequentially along the second direction.

16. The battery device according to claim 15, wherein, The first direction is the thickness direction of the pouch cell, and the width direction of the pouch cell is the third direction. The projections of two cell groups stacked and adjacent to each other along the first direction coincide.

17. The battery device according to any one of claims 1-16, wherein, The pouch cell includes a pouch shell and electrode terminals. The electrode terminals are connected to an electrode assembly inside the pouch shell and include lead-out portions extending out of the pouch shell. The lead-out portions adjacent to each other in the pouch shell are directly or indirectly connected to form a conductive structure. The conductive structure located at the end of the cell assembly along the second direction is a flexible structure and is bent to form the flexible bent conductive structure.

18. The battery device according to claim 17, wherein, The leads from the two pouch cells are overlapped and connected in the flexible bending conductive structure.

19. The battery device according to claim 18, wherein, The two leads forming the lap joint are connected at the lap joint by welding or conductive adhesive.

20. The battery device according to claim 18 or 19, wherein, The overlapping connection position of the two leads in the flexible bending conductive structure is offset from the bending position of the flexible bending conductive structure.

21. The battery device according to claim 20, wherein, The flexible bend conductive structure is centered, and the overlapping connection position of the two leads in the flexible bend conductive structure is located on one side of the bend position in the first direction and is opposite to the corresponding cell group along the second direction.

22. The battery device according to claim 20 or 21, wherein, In the flexible bent conductive structure, the two leads forming an overlapping connection are a first lead and a second lead. The battery cell group extending from the first lead is a first battery cell group, and the battery cell group extending from the second lead is a second battery cell group. The first battery cell group and the second battery cell group are stacked adjacent to each other. The length of the first lead is greater than the length of the second lead. The first lead includes an extension section, a bending section, and an overlapping section. The extension section is opposite to the first battery cell group along the second direction. The overlapping section is spaced apart from the extension section along the first direction. The overlapping section is opposite to the second battery cell group along the second direction. The bending section is bent and its two ends are respectively connected to the extension section and the overlapping section. The second lead is opposite to the second battery cell group along the second direction and overlaps with the overlapping section.

23. The battery device according to claim 22, wherein, The second direction is the length direction of the pouch cell, and each pouch cell has a first lead-out portion and a second lead-out portion at both ends in the length direction.

24. The battery device according to claim 20 or 21, wherein, In the flexible bending conductive structure, the two leads that form an overlapping connection have the same length, and the bending position of the flexible bending conductive structure is located at the point where the two leads overlap without connection.

25. The battery device according to claim 17, wherein, In the flexible, bent conductive structure, the leads from the two pouch cells are indirectly connected via an adapter plate.

26. The battery device according to claim 25, wherein, The adapter piece is connected to the lead-out part by overlapping.

27. The battery device according to claim 26, wherein, The overlapping connection position between the adapter piece and the lead-out portion is offset from the bending position of the flexible bending conductive structure.

28. The battery device according to any one of claims 25-27, wherein, The flexible bending conductive structure is bent at the adapter piece, and the bending position of the flexible bending conductive structure is centered.

29. The battery device according to any one of claims 1-28, wherein, The bending position of the flexible bending conductive structure is offset from the connection conductive position of the two battery cell groups in the flexible bending conductive structure.

30. The battery device according to any one of claims 1-29, wherein, The bends of the flexible conductive structure are rounded.

31. The battery device according to claim 30, wherein, The flexible, bent conductive structure is U-shaped or C-shaped.

32. The battery device according to any one of claims 1-31, wherein, The battery cell assembly has a first edge and a second edge on its two sides in the third direction, respectively. The flexible bending conductive structure is disposed in the third direction relative to the second edge and close to the first edge, so as to form a first reserved space on the side of the flexible bending conductive structure close to the second edge. The first direction, the second direction and the third direction are perpendicular to each other.

33. The battery device according to claim 32, wherein, The flexible, bent conductive structure is located on the side of the cell assembly near the first edge of the center line in the third direction.

34. The battery device according to claim 32 or 33, wherein, The battery device includes a housing for loading the pouch cells, and a reinforcing partition is sandwiched between at least two adjacent cell groups along the first direction. The stiffness of the reinforcing partition is greater than the stiffness of the pouch shell of the pouch cells. The reinforcing partition has a connecting portion that protrudes from the cell groups along the second direction, and the connecting portion extends into the first reserved space and connects to the housing.

35. The battery device according to claim 34, wherein, The enclosure includes an enclosure body and a mounting bracket. The mounting bracket is installed inside the enclosure body and is located on one side of the battery cell assembly in the second direction. The connecting part is connected to the mounting bracket.

36. The battery device according to claim 35, wherein, The connecting part has a first edge on the side closer to the second edge in the third direction, and the mounting bracket has a second edge on the side closer to the second edge in the third direction. Both the first edge and the second edge are located on the side of the second edge closer to the first edge, so that the connecting part and the mounting bracket form a second reserved space on the side of the third direction away from the first edge.

37. The battery device according to claim 35 or 36, wherein, The length and width directions of the enclosure are respectively the first direction and the second direction. The height direction of the enclosure is the third direction. The enclosure body is provided with a plurality of mounting brackets arranged along the first direction at both ends of the second direction.

38. The battery device according to any one of claims 1-37, wherein, The thickness direction of the pouch cell is the first direction. The cell assembly includes one pouch cell or multiple pouch cells laid flat on a plane perpendicular to the first direction. A reinforcing partition is sandwiched between at least two adjacent cell assemblies along the first direction. The thickness direction of the reinforcing partition is the first direction. The stiffness of the reinforcing partition is greater than the stiffness of the pouch shell of the pouch cell. The thickness of the reinforcing partition is less than the thickness of the cell assembly. The reinforcing partition is configured to allow heat exchange between the reinforcing partition and the electrode assembly inside the pouch cell through the pouch shell in contact with it.

39. The battery device according to claim 38, wherein, The reinforcing partition covers more than 80% of the total area of ​​all the pouch cells in the cell assembly.

40. The battery device according to claim 38 or 39, wherein, Multiple reinforcing partitions are sandwiched between the multiple battery cell groups stacked along the first direction, and only one reinforcing partition is sandwiched between each two adjacent battery cell groups. Two reinforcing partitions arranged adjacent to each other along the first direction are connected by a connecting plate located on the side of the battery cell group in the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

41. The battery device according to any one of claims 1-40, wherein, A buffer is sandwiched between at least two adjacent cell groups along the first direction, the stiffness of which is less than the stiffness of the soft-pack outer shell of the soft-pack cell.

42. The battery device according to any one of claims 38-40, wherein, A buffer is sandwiched between at least two adjacent cell groups along the first direction. The stiffness of the buffer is less than the stiffness of the soft-pack outer shell of the soft-pack cell. A plurality of reinforcing partitions and a plurality of buffers are sandwiched between a plurality of cell groups stacked along the first direction. Each cell group is sandwiched between the buffer and the reinforcing partition.

43. The battery device according to any one of claims 1-42, wherein, The soft-pack battery cell includes two membrane portions arranged and connected along the thickness direction of the soft-pack battery cell. Each membrane portion defines a receiving groove. The receiving grooves of the two membrane portions open toward each other along the thickness direction of the soft-pack battery cell and together form the receiving cavity of the soft-pack battery cell. The electrode assembly of the soft-pack battery cell is disposed in the receiving cavity.

44. The battery device according to claim 43, wherein, The wall thickness of the membrane portion is less than or equal to 0.2 mm. The dimension of the soft-pack battery cell in the thickness direction is a first dimension. The dimension of the membrane portion in the thickness direction of the soft-pack battery cell is a second dimension. The ratio of the second dimension to the first dimension is greater than or equal to 0.4 and less than or equal to 0.

6. The first dimension is greater than or equal to 5 mm and less than or equal to 70 mm.

45. The battery device according to claim 43 or 44, wherein, The two membrane portions are separate components and each has a sealing structure around the perimeter of the pouch cell.

46. ​​The battery device according to claim 43 or 44, wherein, The two membrane portions are integral and have sealing structures on one long side and two wide sides around the pouch cell.

47. The battery device according to any one of claims 1-46, wherein, The battery device includes a cell array, the cell array including a plurality of cell groups stacked along the first direction, the battery device including a housing for loading the cell array, one of the length direction and the width direction of the housing being the first direction and the other being the second direction, the thickness direction of the pouch cell being the first direction, the second direction being the length direction of the pouch cell, the width direction of the pouch cell being consistent with the height direction of the housing, and the housing including cover plates disposed on both sides of the cell array along the height direction of the housing.

48. The battery device according to claim 47, wherein, At least one of the cover plates exchanges heat with the battery cell.

49. The battery device according to claim 47 or 48, wherein, Structural adhesive is used to fill the space between the battery cell array and the cover plate.

50. The battery device according to claim 49, wherein, The structural adhesive is a thermally conductive adhesive.

51. The battery device according to claim 49 or 50, wherein, The housing is provided with a baffle strip, and the cover plate includes a base plate located below the cell array. A mating gap is formed between the bottoms of two adjacent soft-pack cells arranged along the first direction, and the baffle strip is located between the mating gap and the base plate.

52. The battery device according to claim 51, wherein, Two adjacent pouch cells share one of the sealing strips.

53. The battery device according to claim 52, wherein, The adhesive strip is adhesive-resistant foam, and the adhesive strip is bonded to the base plate; or, the adhesive strip is a single-sided adhesive strip, and the adhesive strip is bonded to the bottom of the soft-pack battery cell.

54. The battery device according to any one of claims 47-52, wherein, The battery device further includes a heat exchange plate disposed between the cell array and at least one of the cover plates.

55. The battery device according to any one of claims 1-54, wherein, The pouch cell is any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell.

56. The battery device according to claim 55, wherein, The pouch 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 pouch cell is 96:(1-3):(1-3); the pouch 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 pouch cell is 96:(2-3):(1-2).

57. An electrical appliance, wherein, Includes the battery device according to any one of claims 1-56.

58. A method for processing a battery device, wherein, The battery device includes multiple pouch cells, each pouch cell having electrode terminals extending from both ends, wherein the extending direction of the electrode terminals is perpendicular to the thickness direction of the pouch cell, and the processing method includes the following steps: Multiple pouch cells are connected together along the extension direction of the electrode terminals to form a cell string. The cell string is divided into multiple cell groups arranged sequentially along the arrangement direction of the multiple pouch cells. Each cell group includes at least one pouch cell. In the cell string, every two adjacent pouch cells are connected through adjacent electrode terminals to form a conductive structure. The two conductive structures at both ends of each battery cell are bent in opposite directions, so that the two battery cell groups connected to the battery cell group are stacked on both sides of the thickness direction of the battery cell group.

59. The method for processing the battery device according to claim 58, wherein, The step of connecting multiple pouch cells into a string along the extension direction of the electrode terminals specifically includes the following steps: Multiple pouch cells are laid out in a row along the extension direction of the electrode terminals; Connect the electrode terminals at adjacent positions of every two adjacent pouch cells.

60. The method of processing the battery device according to claim 58 or 59, wherein, The step of connecting multiple pouch cells into a string along the extension direction of the electrode terminals specifically includes the following steps: The electrode terminals at adjacent positions of every two adjacent pouch cells are overlapped and welded.

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