Battery device and electric device

Abstract

A battery device and an electric device, relating to the technical field of batteries. The battery device comprises: a battery cell row and a case, wherein the battery cell row is bonded in the case, and the battery cell row comprises a plurality of pouch battery cells stacked in the direction of thickness; a reinforcing partition plate is provided between large surfaces of at least two adjacent pouch battery cells of the battery cell row, and the reinforcing partition plate is connected to the case; the rigidity of the reinforcing partition plate is greater than the rigidity of a pouch casing of each pouch battery cell; and the reinforcing partition plate exchanges heat with the pouch battery cells.

Description

Battery devices and electrical appliances Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical 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. Among these, some power batteries use pouch cells. However, the inherent characteristics of pouch cells, such as their susceptibility to deformation and poor heat dissipation, have hindered further improvements in the reliability of power batteries. Summary of the Invention

[0003] This application provides a battery device and an electrical device that can improve the reliability of pouch cells.

[0004] In a first aspect, embodiments of this application provide a battery device, the battery device comprising: a cell array and a housing; the cell array is bonded to the housing, the cell array comprising a plurality of pouch cells stacked along the thickness direction; wherein, a reinforcing partition is provided between the large surfaces of at least two adjacent pouch cells in the cell array, the reinforcing partition is connected to the housing, the stiffness of the reinforcing partition is greater than the stiffness of the pouch shell of the pouch cell, and the reinforcing partition exchanges heat with the pouch cell.

[0005] In the above technical solution, by setting the casing and cell array to be bonded together, the connection between the casing and cell array is simplified, improving the production efficiency of the battery device. Secondly, it saves on the introduction of parts, reduces costs, simplifies the connection process, and reduces the space occupied within the casing, thus contributing to increasing the energy density of the battery device. By setting a reinforcing separator connected to the casing, the reinforcing separator is fixed, effectively supporting the pouch cells and increasing the rigidity of the cell array, thereby improving the overall rigidity of the battery device. Furthermore, by setting up heat exchange between the reinforcing separator and the pouch cells, and by connecting the reinforcing separator to the casing, a heat exchange path is formed at the connection point. This allows the pouch cells to transfer heat to the casing through the reinforcing separator, improving the heat dissipation efficiency of the pouch cells.

[0006] In some embodiments, the battery device includes a housing for loading battery cells, and the edge of a reinforcing separator has a connecting portion protruding from the pouch cell for connecting to the housing.

[0007] In the above technical solution, by setting a reinforcing partition connected to the enclosure, a reliable connection between the cell array and the enclosure can be achieved, improving the connection reliability between the cell array and the enclosure. When the surface area of ​​the pouch cell facing the enclosure is small, it is difficult to achieve a reliable connection between the pouch cell and the enclosure. Using a reinforcing partition connected to the enclosure can improve the connection reliability between the cell array and the enclosure, enabling the pouch cell to work stably and reliably.

[0008] In some embodiments, the enclosure includes an enclosure body and a mounting bracket, the mounting bracket being installed inside the enclosure body, and the connecting portion being connected to the mounting bracket.

[0009] In the above technical solution, by installing a mounting bracket inside the enclosure and connecting the reinforcing partition to the enclosure through the mounting bracket, the connection difficulty between the reinforcing partition and the enclosure can be reduced, and flexible installation of the reinforcing partition and the enclosure can be achieved. In addition, the shape, position and material of the mounting bracket can be flexibly designed to further reduce the connection difficulty between it and the reinforcing partition and improve the connection reliability between it and the reinforcing partition, thereby improving the reliability and stability of the mounting bracket in fixing the battery cell array.

[0010] In some embodiments, the pouch cells in the cell array are arranged along the thickness direction of the pouch cells, the width direction of the pouch cells is vertical, the length direction of the pouch cells is horizontal, and the mounting bracket is located on one side of the length direction of the pouch cells.

[0011] In the above technical solution, both the cell array and the mounting bracket can reduce the vertical space occupied, which is beneficial to improving the vertical structural compactness of the battery device, reducing the vertical size of the battery device, and facilitating the arrangement of the battery device in locations with limited vertical space (such as under a vehicle). Furthermore, there is no vertical stacking relationship between the pouch cells in the cell array, improving the consistency of the pouch cells within the cell array. Moreover, the placement of the mounting bracket facilitates connection with the reinforcing separators in the cell array, thereby improving the reliability and stability of the mounting bracket in fixing the cell array.

[0012] In some embodiments, the upper end of the mounting bracket is lower than the upper end of the pouch cell to form an upper clearance space above the mounting bracket, and the connecting part is connected to the mounting bracket at a position lower than the upper clearance space.

[0013] In the above technical solution, by reserving an upper clearance space above the mounting bracket, other components of the battery device can be arranged in the upper clearance space, such as wiring, thereby making full use of the space above the mounting bracket and reducing the space occupied in other locations, which is conducive to improving the compactness and energy density of the battery device.

[0014] In some embodiments, the connecting portion is connected to the upper part of the mounting bracket, and the lower end of the connecting portion is higher than the lower end of the mounting bracket to form a lower clearance space below the connecting portion. The pouch cell has a conductive element electrically connected to the electrode assembly of the pouch cell, and at least a portion of the conductive element is exposed outside the pouch housing and located in the lower clearance space.

[0015] In the above technical solution, by setting the size of the connecting part to be relatively small in the vertical direction and positioned higher than the mounting bracket, a lower clearance space can be formed below the connecting part. This lower clearance space can accommodate the conductive components of the soft-pack battery cell, thereby making full use of the space below the connecting part and reducing the space occupied in other positions, which is beneficial to improving the compactness and energy density of the battery device.

[0016] In some embodiments, a mounting bracket is connected to at least two connecting parts.

[0017] In the above technical solution, by setting a mounting bracket and connecting it to at least two connecting parts, the number of mounting brackets used can be reduced to a certain extent, the number of parts can be reduced, and the assembly efficiency can be improved.

[0018] In some embodiments, the mounting bracket includes a plurality of sidewalls spaced apart along the arrangement direction of the pouch cells in the cell array, each sidewall corresponding to a connecting portion, and the connecting portion being connected to the sidewall.

[0019] In the above technical solution, the mounting bracket can reduce the space occupied while meeting the connection requirements of the connecting part, and can also minimize the material cost of the mounting bracket, thus achieving lightweight design.

[0020] In some embodiments, there are multiple mounting brackets arranged along the arrangement direction of the pouch cells in the cell array. Each mounting bracket includes two sidewalls and a connecting wall connecting the two sidewalls. The adjacent sidewalls of two adjacent mounting brackets clamp the same connecting portion.

[0021] The above technical solution can reduce the processing difficulty of a single mounting bracket and facilitate the flexible connection between the soft-pack battery cell and the mounting bracket.

[0022] In some embodiments, one of the length direction and the width direction of the housing is a first direction, the other is a second direction, the height direction of the housing is a third direction, the pouch cells in the cell array are arranged along the first direction, the first direction is the thickness direction of the pouch cells, the second direction is the length direction of the pouch cells, the third direction is the width direction of the pouch cells, and the housing is provided with mounting brackets at both ends in the second direction.

[0023] In the above technical solution, the arrangement of the mounting brackets is not only conducive to connecting with each reinforcing partition, but also does not easily lead to an increase in the height dimension of the box, thus ensuring that the height dimension of the box is relatively small.

[0024] In some embodiments, each end of the housing in the second direction is provided with a plurality of mounting brackets arranged along the first direction.

[0025] In the above technical solution, by setting multiple mounting brackets, it is convenient to flexibly connect with multiple reinforcing partitions, reducing the difficulty of connecting the reinforcing partitions and mounting brackets.

[0026] In some embodiments, a battery module is provided inside the housing. The battery module includes two cell rows arranged along a second direction, wherein all the pouch cells in each cell row are stacked sequentially along the thickness direction of the pouch cells; the ends of the two cell rows in the same battery module that are far apart from each other in the second direction are respectively connected to the mounting brackets on the corresponding sides.

[0027] The above technical solution can reduce the length of a single pouch cell and lower the processing difficulty of a single pouch cell.

[0028] In some embodiments, the length of the reinforcing separator extends along the second direction, and the two ends of the length of the reinforcing separator extend to the two ends of the battery module in the second direction, so that the two cell arrays in the battery module share the reinforcing separator, and the two ends of the length of the reinforcing separator are respectively connected to the mounting brackets at the two ends of the housing in the second direction.

[0029] In the above technical solution, the length of the reinforcing separator is relatively long, which can reduce the number of reinforcing separators and improve the overall stability of the battery module. Furthermore, there is no need to install mounting brackets between the two cell rows in the battery module, thereby reducing the number of mounting brackets used, improving assembly efficiency, and lowering production costs.

[0030] In some embodiments, the battery device includes a housing for loading battery cells, the housing including cover plates disposed on both sides of the battery cells along the height direction of the housing, the cover plates on both sides being a top plate and a bottom plate, respectively, and the battery device further includes a heat exchange plate disposed between the battery cells and the cover plates, and used for heat exchange with the battery cells.

[0031] In the above technical solution, the heat exchange plate can easily exchange heat with multiple pouch cells, thereby enabling the cell array to achieve good heat exchange effect, allowing the cell array to work stably and reliably, and thus making the battery device work more stably.

[0032] In some embodiments, the width direction of the pouch cell is consistent with the height direction of the housing, and the surface of the pouch outer shell facing the heat exchange plate in the width direction of the pouch cell is flat and connected to the heat exchange plate through a heat-conducting medium.

[0033] In the above technical solution, setting the surface of the soft-pack outer shell facing the heat exchange plate as a plane can make the soft-pack outer shell and the heat exchange plate have a stable mating contact surface. This allows the soft-pack outer shell to be stably and reliably fixed to the heat exchange plate by thermally conductive adhesive or thermally conductive pads, making the assembly and fixing of the soft-pack battery cells on the heat exchange plate more convenient and stable, and making the assembly and fixing of the battery cell array and the heat exchange plate more reliable, thereby improving the heat exchange reliability.

[0034] In some embodiments, the battery device includes a housing for mounting the battery cell array, the housing including cover plates disposed on both sides of the battery cell array along the height direction of the housing, the cover plates on both sides being a top plate and a bottom plate, the housing further including a heat exchange plate disposed between the battery cell array and the bottom plate and used for heat exchange with the battery cell array, the mounting bracket being disposed on the top of the heat exchange plate.

[0035] In the above technical solution, by setting the mounting bracket on the top of the heat exchange plate, the mounting bracket can exchange heat with the heat exchange plate, avoiding the heat from being concentrated on the mounting bracket, thereby improving the overall heat dissipation effect of the battery device.

[0036] In some embodiments, the thickness of the reinforcing separator is less than the thickness of the pouch cell.

[0037] In the above technical solution, by setting the thickness of the reinforcing separator to be less than the thickness of the pouch cell, the space occupied by the reinforcing separator in the box can be reduced, which is beneficial to improving the energy density of the battery device.

[0038] In some embodiments, the thickness of the reinforcing partition is 0.8 mm to 2.0 mm.

[0039] In the above technical solution, by setting the thickness of the reinforcing separator to 0.8mm to 2.0mm, the reinforcing separator is not too small, and can have good support strength to stably and reliably support the soft-pack battery cell. Moreover, the thickness of the reinforcing separator is not too large, thereby reducing the space occupied by the reinforcing separator. That is, the reinforcing separator can reduce the space occupied while meeting the support requirements, which is conducive to improving the energy density of the battery device.

[0040] In some embodiments, the reinforcing partition is a metal plate.

[0041] In the above technical solution, by using metal materials to process the reinforcing partition, the reinforcing partition can have sufficient support capacity with a small thickness, and can also have good thermal conductivity, which is conducive to the reinforcing partition reliably supporting the soft-pack battery cell and enabling rapid heat exchange.

[0042] In some embodiments, the reinforcing partition is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0043] In the above technical solutions, when the reinforcing partition is made of aluminum plate, aluminum alloy plate, copper plate or steel plate, the material selected for the reinforcing partition is low in cost and easy to obtain, and can have good support strength and heat exchange performance even with a thinner thickness.

[0044] In some embodiments, the reinforcing partition is a solid structure.

[0045] In the above technical solution, by setting the reinforcing partition as a solid structure, that is, in the form of a solid plate, the reinforcing partition can have better strength, improve the reliability of supporting the pouch cell, and enable the pouch cell to receive more stable and reliable support. This is more conducive to improving the problem of force transmission between adjacent pouch cells and reducing the squeezing between adjacent pouch cells.

[0046] In some embodiments, a cavity is formed within the reinforcing partition.

[0047] In the above technical solution, by setting a cavity within the reinforcing partition, the reinforcing partition can absorb the expansion force of the pouch cell, thus providing expansion space and preventing excessive compression of the pouch cell when it expands too much, thereby improving the reliability of the cell array. Furthermore, when the cell array is subjected to collisions, the cavity can absorb the impact force, protecting the pouch cell.

[0048] In some embodiments, the cavity includes a heat exchange channel for distributing the heat exchange medium.

[0049] In the above technical solution, the reinforced separator can exchange heat with the pouch cell using the heat exchange medium within the heat exchange channel. By selecting and controlling the heat exchange medium, the thermal management performance of the reinforced separator for the pouch cell 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 reinforced separator can integrate liquid cooling heat exchange functionality, reducing the need for additional heat exchange structures, thereby simplifying the battery device, reducing the number of components, and increasing the energy density of the battery device.

[0050] In some embodiments, the heat exchange channel extends from one end of the length of the reinforcing partition to the other end of the length of the reinforcing partition.

[0051] In the above technical solution, by setting a heat exchange channel that runs from one end of the length of the reinforcing partition to the other end of the length of the reinforcing partition, the heat exchange performance between the reinforcing partition and the pouch cell can be improved along the entire length.

[0052] In some embodiments, the cavity is provided with reinforcing ribs.

[0053] In the above technical solution, by setting reinforcing ribs in the cavity, the reinforcing separator can have good support strength while having a cavity inside, thus improving the reliability of the reinforcing separator in supporting the soft-pack battery cell. Moreover, while ensuring the reliability of support, the weight of the reinforcing separator can be reduced, the material cost of the reinforcing separator can be reduced, and the battery device can be made lighter and cheaper.

[0054] In some embodiments, the length direction of the reinforcing separator extends along the length direction of the pouch cell, wherein the length of the reinforcing separator is greater than 80% of the length of the pouch cell; and / or, the width of the reinforcing separator is greater than 80% of the width of the pouch cell.

[0055] In the above technical solution, the reinforced partition can cover the pouch cell to a greater extent, improving the support and heat exchange effect of the pouch cell.

[0056] In some embodiments, multiple adjacent cell rows arranged along the length of the pouch cell share a reinforcing partition.

[0057] In the above technical solution, by arranging multiple cell rows along the length of the pouch cell, the energy density of the battery device can be improved. Compared with the solution using a single, longer pouch cell, this embodiment can reduce the length of a single pouch cell, thereby reducing the processing difficulty of a single pouch cell. Moreover, by strengthening the sharing of separators, the number of separators required can be reduced, and the overall structural stability can be improved.

[0058] In some embodiments, the length of the reinforcing partition is greater than twice the length of the pouch cell, so that two adjacent cell rows arranged along the length direction of the pouch cell can share the reinforcing partition.

[0059] In the above technical solution, by setting the length of the reinforcing partition to be greater than twice the length of the pouch cell, two adjacent cell rows arranged along the length direction of the pouch cell can share the reinforcing partition. This allows the reinforcing partition to simultaneously support two adjacent pouch cells arranged along the length direction of the pouch cell, and each pouch cell can be adequately supported and heat exchanged along the length direction of the pouch cell.

[0060] In some embodiments, the width of the reinforcing partition is smaller than the width of the pouch cell.

[0061] In the above technical solution, by setting the width of the reinforcing separator to be smaller than the width of the pouch cell, the reinforcing separator is less likely to extend beyond the pouch cell in the width direction, thus avoiding the occupation of space in the width direction of the pouch cell and facilitating the arrangement of other components of the battery device on the width side of the pouch cell.

[0062] In some embodiments, the adhesive connection between the separator and the pouch cell is strengthened.

[0063] In the above technical solution, the reinforcing separator is bonded to the adjacent pouch cell, making the connection simple and reliable. The reinforcing separator can stably exchange heat with the pouch cell. In addition, the adhesive layer occupies little space, allowing the reinforcing separator and pouch cell to be arranged compactly, resulting in a more compact and stable overall cell structure, which is beneficial to improving battery energy density.

[0064] In some embodiments, the reinforcing partition and the soft-pack battery cell are bonded together with double-sided adhesive.

[0065] In the above technical solution, the reinforcing partition is fixed to the adjacent soft-pack battery cell by double-sided adhesive, which can avoid the problem of adhesive overflow, avoid the space occupation caused by overflowing adhesive, and eliminate the need for subsequent cleaning of overflowing adhesive.

[0066] In some embodiments, the cell array includes a plurality of reinforcing partitions arranged along the thickness direction of the pouch cell. Two reinforcing partitions, which are adjacent to each other along the thickness direction and located on both sides of at least one pouch cell in the thickness direction, are connected by a connecting plate located in the outer peripheral region of the pouch cell.

[0067] In the above technical solution, the reliability of the reinforcing partition supporting the soft-pack battery cell can be improved by setting a connecting plate, and the setting position of the connecting plate does not interfere with the soft-pack battery cell.

[0068] In some embodiments, the connecting plate is disposed between the two reinforcing partitions to which it is connected, and is integrally connected with the two reinforcing partitions to form a U-shaped shell.

[0069] In the above technical solution, the process of connecting the connecting plate and the reinforcing partition can be eliminated, thereby improving the reliability of the connection between the connecting plate and the reinforcing partition.

[0070] In some embodiments, a reinforcing partition is sandwiched between each pair of adjacent pouch cells in the cell stack.

[0071] In the above technical solution, by setting a reinforcing partition between each pair of adjacent pouch cells in the cell bar, each pouch cell can be supported and heat-exchanged by the reinforcing partition, thereby more fully optimizing the reliability and performance of the cell bar.

[0072] In some embodiments, a plurality of pouch cells are sandwiched between two adjacent reinforcing partitions in the cell stack.

[0073] In the above technical solution, by setting multiple soft-pack cells sandwiched between two adjacent reinforcing partitions without setting reinforcing partitions, the number of reinforcing partitions can be reduced, thereby reducing the cost of using reinforcing partitions.

[0074] In some embodiments, the number of pouch cells sandwiched between two adjacent reinforcing partitions in the cell stack is less than or equal to four.

[0075] In the above technical solution, when multiple soft-pack cells are sandwiched between two adjacent reinforcing partitions in the cell array, the number of soft-pack cells between the two adjacent reinforcing partitions is set to be less than or equal to four. This makes the arrangement of soft-pack cells between the two adjacent reinforcing partitions more appropriate, avoiding the problem that the number of soft-pack cells between the two reinforcing partitions exceeds the support capacity of the reinforcing partitions. This ensures that each soft-pack cell between the two reinforcing partitions can receive reliable support from the two reinforcing partitions.

[0076] In some embodiments, a buffer is sandwiched between at least two adjacent pouch cells in the cell stack, and the stiffness of the buffer is less than that of the pouch shell.

[0077] In the above technical solution, by setting a buffer between two adjacent soft-pack cells, and the stiffness of the buffer is less than that of the soft-pack shell, the buffer can provide expansion space to the soft-pack cells, so that the buffer can effectively absorb the expansion deformation of the soft-pack cells and the vibration under external impact, thereby improving the overall structural stability of the cell array.

[0078] In some embodiments, a buffer and a reinforcing partition are provided between at least two adjacent pouch cells in the cell stack.

[0079] In the above technical solution, when a buffer and a reinforcing partition are provided between two adjacent soft-pack cells, the two adjacent soft-pack cells can be effectively separated by the cooperation of the reinforcing partition and the buffer, which can play both a buffering role and a supporting role, thereby improving the reliability of the cell array.

[0080] In some embodiments, a buffer is sandwiched between two adjacent reinforcing partitions to form a partition group, and the partition group is disposed between two adjacent pouch cells.

[0081] The above technical solution is beneficial for both heat dissipation and buffering.

[0082] In some embodiments, at most one of a buffer or a reinforcing partition is provided between any two adjacent pouch cells in the cell stack.

[0083] In the above technical solution, by setting at most one of a buffer or a reinforcing separator between any two adjacent pouch cells in the cell array, the spacing between two adjacent pouch cells can be reduced, improving the compactness of the fit between adjacent pouch cells and thus increasing the energy density of the battery device. Furthermore, there is no need to consider the fit between the reinforcing separator and the buffer, thereby simplifying assembly.

[0084] In some embodiments, at least one pouch cell in the cell stack is sandwiched between a buffer and a reinforcing partition.

[0085] In the above technical solution, the soft-pack battery cell sandwiched between the buffer and the reinforcing partition can not only be supported and heat exchanged by the reinforcing partition on one side, but also buffered by the buffer on the other side, thereby improving the reliability and performance of the soft-pack battery cell.

[0086] In some embodiments, buffers and reinforcing baffles are alternately arranged in the cell stack.

[0087] In the above technical solution, buffers or reinforcing baffles are arranged between two adjacent soft-pack cells in the cell bar. The buffers and reinforcing baffles are arranged alternately, so that the arrangement of the reinforcing baffles and buffers in the cell bar is more balanced, and each soft-pack cell in the cell bar can obtain stable and reliable support, heat exchange and buffering effect.

[0088] In some embodiments, the buffer covers more than 80% of the area of ​​the thickness-side surface of the pouch cell; and / or, the buffer is a foam layer or a silicone layer.

[0089] In the above technical solution, by setting the buffer to cover more than 80% of the surface area of ​​the thickness side of the pouch cell, a larger buffer mating area can be formed between the pouch cell and the buffer, thereby improving the buffering effect of the buffer on the pouch cell. This allows the pouch cell to receive buffer protection over a wider area, improving its reliability. By setting the buffer to a foam layer or a silicone layer, the buffer has better force absorption capacity and relatively lower weight and cost, which is beneficial for the lightweight and low-cost design of battery devices.

[0090] In some embodiments, the cell array has buffers at both ends in the thickness direction of the pouch cell, the stiffness of the buffers being less than the stiffness of the pouch shell, and all the pouch cells in the cell array are sandwiched between the buffers at both ends.

[0091] The above technical solution is beneficial for heat dissipation and buffering, and can reduce space occupation and improve the energy density of the battery device.

[0092] In some embodiments, the pouch cell includes a conductive element electrically connected to the electrode assembly of the pouch cell and at least partially exposed outside the pouch casing; two adjacent pouch cells in a cell array are connected by the conductive element.

[0093] In the above technical solution, by setting two adjacent pouch cells to be connected by a conductive component, the connection of multiple pouch cells in the cell array can be simplified, which is conducive to realizing the electrical connection of pouch cells in the battery device.

[0094] In some embodiments, the two conductive elements constituting the connection are overlapped, and at least one conductive element is in a bent shape.

[0095] In the above technical solution, by setting the two conductive components that constitute the connection to overlap, the two conductive components can have a larger connection area, thereby making the connection between the two conductive components more stable and reliable. Moreover, by setting at least one conductive component to a bent shape, the two soft-pack battery cells connected by the conductive components can be stacked along the thickness direction. Furthermore, this connection method can simplify the structure, reduce the number of parts, and improve assembly efficiency.

[0096] In some embodiments, the two conductive components forming the connection are connected by an adapter piece, which is in a curved shape.

[0097] In the above technical solution, by connecting adjacent pouch cells in the cell array via adapter plates, and by designing these adapter plates to be curved, the design of conductive components can be simplified, their length shortened, and the processing steps and procedures for connecting the pouch cells reduced, thereby improving production efficiency. Furthermore, it allows two pouch cells connected by the conductive components to be stacked along their thickness direction. In addition, standardized adapter plates can be used for rapid and efficient connection processing, making the connection of multiple pouch cells more convenient and efficient, and further increasing the production efficiency of the cell array.

[0098] In some embodiments, conductive elements are provided at both ends of the pouch cell along its length, and the conductive elements at adjacent ends of two adjacent pouch cells along their length are connected.

[0099] In the above technical solution, by setting conductive elements at both ends of the pouch cell along its length and connecting the conductive elements at adjacent ends of two adjacent pouch cells along their length, the occupancy in the width direction of the pouch cell can be reduced. When the width direction is vertical, it is beneficial to reduce the occupancy in the vertical space, reduce the vertical dimension of the battery device, and increase the vertical energy density of the battery device.

[0100] In some embodiments, the polarities of the two conductive elements at both ends of the pouch cell along its length are opposite, and the polarities of the two conductive elements forming a connection are the same or opposite.

[0101] In the above technical solutions, series and / or parallel connections can be implemented as needed, allowing for flexible configuration of the battery device.

[0102] In some embodiments, the cell array includes at least three pouch cells, and in the cell array, among the two conductive elements of the pouch cells located between two adjacent pouch cells, one conductive element is connected to the conductive element on the same side of an adjacent pouch cell, and the other conductive element is connected to the conductive element on the same side of another adjacent pouch cell.

[0103] In the above technical solution, multiple soft-pack battery cells can be arranged in a row along the length of the soft-pack battery cell, and each pair of adjacent conductive parts can be connected. Then, the connection of the conductive parts is bent so that multiple soft-pack battery cells can be arranged in a row along the thickness direction, thereby simplifying the processing and improving production efficiency.

[0104] In some embodiments, the battery device includes a housing for loading cell arrays, the housing containing a battery module, the battery module including two cell arrays arranged along the length direction of the pouch cells, wherein all the pouch cells in each cell array are stacked sequentially along the thickness direction of the pouch cells; the two cell arrays in the same battery module are connected by conductive elements on the sides of the pouch cells that are close to each other along the length direction of the pouch cells.

[0105] In the above technical solution, multiple cell arrays can be easily connected in series and / or in parallel, which helps to simplify the electrical connections within the entire battery device.

[0106] In some embodiments, the battery device includes a housing for loading battery cells, wherein the edge of a reinforcing separator has a connecting portion protruding from the pouch cell along the length direction of the pouch cell, the connecting portion being connected to the housing and spaced apart from the conductive element along the width direction of the pouch cell.

[0107] The above technical solution can make full use of space, improve spatial compactness, and reduce the space occupied in the width direction of the soft-pack cell. When the width direction is vertical, it is beneficial to reduce the vertical space occupied, reduce the vertical size of the battery device, and improve the vertical energy density of the battery device.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] In some embodiments, the two membrane portions are separate components and have sealing structures around the perimeter of the pouch cell.

[0113] In the above technical solution, individual membrane sections are easy to process, which can reduce the processing difficulty.

[0114] 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.

[0115] 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.

[0116] In some embodiments, the battery device includes a housing for loading battery cell arrays. The housing includes a top plate and a bottom plate disposed on both sides of the battery cell arrays along the height direction of the housing. The width direction of the pouch cells is consistent with the height direction of the housing. Structural adhesive is used to fill the space between the battery cell arrays and the bottom plate.

[0117] The above technical solution can improve the stiffness of the pouch cell along the height of the housing.

[0118] In some embodiments, the structural adhesive is a thermally conductive adhesive.

[0119] The above technical solution is beneficial for heat dissipation of the soft-pack battery cell.

[0120] In some embodiments, a baffle strip is provided inside the housing, the bottom plate is located below the cell array, a mating gap is formed between the bottoms of two adjacent soft-pack cells arranged along the thickness direction of the soft-pack cell, and the baffle strip is located between the mating gap and the bottom plate.

[0121] 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.

[0122] In some embodiments, two adjacent pouch cells share a single rubber strip.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] In some embodiments, the reinforcing partition is an inverted T-shaped or L-shaped structure and includes a first portion located between adjacent pouch cells and a second portion located below the pouch cells, the second portion being located between the bottom of the pouch cells and the base plate.

[0127] In the above technical solution, the second part can be wrapped in structural adhesive, so that the bottom of the soft-pack battery cell, the second part, and the base plate are fixed by structural adhesive. This can increase the connection and heat transfer area between the reinforcing partition and the housing, improve the yield of rigid support, and when the reinforcing partition is an inverted T-shaped structure, the second part can be separated between the bottoms of adjacent soft-pack battery cells to form a mating gap with the base plate, preventing structural adhesive from overflowing between adjacent soft-pack battery cells, reducing the probability of local hard structures formed by adhesive overflow between adjacent soft-pack battery cells, thereby improving the problem of local stress concentration between adjacent soft-pack battery cells and reducing the risk of damage to soft-pack battery cells.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] Secondly, embodiments of this application also provide an electrical device, including a battery device according to any of the above-described solutions.

[0133] In the above technical solution, the improved performance of the battery device is beneficial to improving the power consumption performance of the electrical device. Attached Figure Description

[0134] 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.

[0135] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this application;

[0136] Figure 2 is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0137] 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;

[0138] Figure 4 is a schematic diagram of multiple cell arrays in a battery device provided in some embodiments of this application;

[0139] Figure 5 is a schematic diagram of a battery cell array in a battery device provided in some embodiments of this application;

[0140] Figure 6 is an enlarged view of part A circled in Figure 5;

[0141] Figure 7 is an enlarged view of part B shown in the box in Figure 3;

[0142] Figure 8 is a cross-sectional view of a reinforcing partition provided in some embodiments of this application;

[0143] Figure 9 is a schematic diagram of the cooperation between the soft-pack battery cell and the reinforcing separator provided in some embodiments of this application;

[0144] Figure 10 is a schematic diagram of multiple battery cell arrays provided in some embodiments of this application;

[0145] Figure 11 is a partial schematic diagram of the battery cell bus provided in some embodiments of this application;

[0146] Figure 12 is a partial schematic diagram of a battery cell bus provided in some other embodiments of this application;

[0147] Figure 13 is a schematic diagram of the connection between the battery cell bus and the mounting bracket provided in some embodiments of this application;

[0148] Figure 14 is an enlarged view of part C shown in the box in Figure 13;

[0149] Figure 15 is an enlarged view of part F shown in the box in Figure 4;

[0150] Figure 16 is a schematic diagram of a battery device provided in some embodiments of this application;

[0151] Figure 17 is a cross-sectional view along the EE line shown in Figure 16;

[0152] Figure 18 is an enlarged view of part D shown in the box in Figure 17;

[0153] Figure 19 is a schematic diagram of the battery cell array provided in some embodiments of this application;

[0154] Figure 20 shows the state of the two soft-pack cells in the cell stack in Figure 19 before they are folded in half;

[0155] Figure 21 is a schematic diagram of a pouch cell provided in some embodiments of this application;

[0156] Figure 22 is a partial enlarged view of a pouch cell provided in some embodiments of this application;

[0157] Figure 23 is a partially enlarged view of the orthographic projection of the pouch cell shown in Figure 21;

[0158] Figure 24 is a partial schematic diagram of a battery device provided in an embodiment of this application;

[0159] Figure 25 is a partial schematic diagram of another battery device provided in an embodiment of this application;

[0160] Figure 26 is a partial schematic diagram of another battery device provided in an embodiment of this application.

[0161] Reference numerals: Vehicle 1000; Battery unit 100; Controller 200; Motor 300; Cell array 10; First direction F1; Second direction F2; Third direction F3; Battery module 101; Upper clearance space S1; Lower clearance space S2; Soft-pack cell 1; Soft-pack outer shell 11; Membrane part 111; Sealing structure 112; Conductive component 12; Adapter piece 13; Reinforcing partition 2; Cavity 21; Heat exchange channel 211; Reinforcing rib 22; Connecting part 23; First part 24; Second part 25; Buffer component 3; Sealing strip 6; Connecting plate 6; Housing 20; Housing body 7; Cover plate 71; Bottom plate 711; Top plate 712; Mounting bracket 8; Side wall 81; Connecting wall 82; Heat exchange plate 9. Detailed Implementation

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] In this application, "multiple" means two or more, including two.

[0169] 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.

[0170] Among the power batteries currently in use, some employ pouch cells. A pouch cell consists of a pouch casing and electrode components housed within it. The casing is typically made of aluminum-plastic film. Compared to hard casings (such as steel or aluminum casings), aluminum-plastic film is softer. When the pouch cell expands during charging and discharging, or when subjected to external pressure, impact, or other mechanical forces, it is prone to deformation and damage, affecting its reliability. Furthermore, pouch cells generate heat during operation. Due to their tight packaging structure and relatively soft casing, their heat dissipation performance is poor. Under high-rate charging and discharging or continuous operation, heat easily accumulates inside the pouch cell, making it difficult to dissipate heat effectively. Excessive temperature accelerates internal chemical reactions, leading to performance degradation and shortening the lifespan of the pouch cell.

[0171] Furthermore, in related technologies, multiple pouch cells are directly stacked and installed inside the battery casing. However, since adjacent pouch cells are in direct contact, forces and heat are directly transferred between them. As a result, the deformation and heat generation of a single pouch cell will affect adjacent pouch cells. For example, the expansion of one pouch cell will compress and deform adjacent pouch cells, or the abnormal heating of one pouch cell will cause the temperature of adjacent pouch cells to rise, thus creating a widening effect from a single point to the whole.

[0172] In view of this, this application proposes a battery device using pouch cells. The pouch cell includes a pouch shell and an electrode assembly disposed within the pouch shell. The thickness direction of the pouch cell is a first direction. Multiple pouch cells are arranged along the first direction to form a cell array. A reinforcing separator is sandwiched between at least two adjacent pouch cells in the cell array. The stiffness of the reinforcing separator is higher than that of the pouch shell, and the reinforcing separator is configured to exchange heat with the corresponding electrode assembly through the pouch shell in contact with it.

[0173] In this way, by setting reinforcing separators between adjacent pouch cells, the pouch cells can be supported, reducing damage caused by deformation and thus improving their reliability. Furthermore, the separators can absorb heat from the pouch cells, facilitating heat dissipation and improving their performance and lifespan. Moreover, the reinforcing separators can separate adjacent pouch cells, preventing direct contact and mitigating the adverse effects of an abnormality in one pouch cell on the other, thereby improving the overall reliability of the battery pack.

[0174] 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.

[0175] 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.

[0176] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0177] 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.

[0178] 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.

[0179] 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 cover plate 71 of the housing 20 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 pouch cells 1 disposed in the housing 20. There are multiple pouch cells 1, which can be connected in series, parallel, or mixed. Mixed connection means that there are both series and parallel connections among the multiple pouch cells 1. The multiple pouch cells 1 can be directly connected in series, parallel, or mixed together, and then the whole formed by the multiple pouch cells 1 is housed in the housing 20; of course, the multiple pouch cells 1 can also be first connected in series, parallel, or mixed to form a battery module, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole and housed in the housing 20.

[0180] Please refer to Figures 2 and 3, and in conjunction with Figures 4 and 5. Figure 4 is a schematic diagram of multiple cell arrays 10 in a battery device 100 provided in some embodiments of this application, and Figure 5 is a schematic diagram of one cell array 10 in a battery device 100 provided in some embodiments of this application. The battery device 100 includes: a cell array 10 and a housing 20; the cell array 10 is adhesively disposed within the housing 20, and the cell array 10 includes multiple pouch cells 1 stacked along the thickness direction.

[0181] The phrase "the battery cell array 10 is bonded and installed inside the housing 20" means that the battery cell array 10 is installed inside the housing 20 and bonded and connected to the housing 20, for example, by structural adhesive, double-sided adhesive, etc.

[0182] The phrase "the cell array 10 includes a plurality of pouch cells 1 stacked along the thickness direction" means that at least a portion of the pouch cells 1 in the cell array 10 are stacked along the thickness direction of the pouch cells 1. For example, all the pouch cells 1 in the cell array 10 may be stacked along the thickness direction of the pouch cells 1; or, for another example, some of the pouch cells 1 in the cell array 10 may be stacked along the thickness direction of the pouch cells 1.

[0183] For example, the cell row 10 may include at least one cell column, each cell column including a plurality of pouch cells 1 stacked along the thickness direction of the pouch cells 1.

[0184] For example, the cell array 10 may include multiple cell groups stacked along the thickness direction of the pouch cell 1, and each cell group includes one or multiple pouch cells 1 laid flat along a direction perpendicular to the thickness direction of the pouch cell 1 (e.g., along the length or width direction of the pouch cell 1).

[0185] Therefore, by setting the housing 20 and the cell array 10 to be bonded together, the connection between the housing 20 and the cell array 10 is simplified, the production efficiency of the battery device 100 is improved, the introduction of parts is saved, the cost is reduced, the connection process is simplified, and the space occupied in the housing 20 is reduced, which helps to improve the energy density of the battery device 100.

[0186] Please refer to Figure 5, and in conjunction with Figures 6 and 7. Figure 6 is an enlarged view of part A circled in Figure 5; Figure 7 is an enlarged view of part B framed in Figure 3. A reinforcing partition 2 is provided between the large surfaces of at least two adjacent pouch cells 1 in the cell array 10. The reinforcing partition 2 is connected to the housing 20. The rigidity of the reinforcing partition 2 is greater than the rigidity of the pouch shell 11 of the pouch cell 1, and the reinforcing partition 2 exchanges heat with the pouch cell 1.

[0187] The term "large surface of the pouch cell 1" refers to the two side surfaces of the pouch cell 1 along its thickness direction (e.g., the first direction F1 shown in the figure). The stacking of two pouch cells 1 along their thickness direction means that the two pouch cells 1 are aligned in the same thickness direction and arranged along their thickness direction, thus presenting the two pouch cells 1 in a large-to-large-surface configuration.

[0188] A reinforcing partition 2 is provided between the large faces of at least two adjacent soft-pack cells 1 in the cell array 10. That is, a reinforcing partition 2 may be provided between the large faces of every two adjacent soft-pack cells 1, or a reinforcing partition 2 may be provided between the large faces of some adjacent soft-pack cells 1, while no reinforcing partition 2 is provided between the large faces of the remaining adjacent soft-pack cells 1.

[0189] It is understood that the outer casing of the pouch cell 1 is a pouch casing 11. The pouch cell 1 includes the pouch casing 11 and electrode assemblies disposed within the pouch casing 11. The electrode assemblies may include positive and negative electrode plates. The material of the pouch casing 11 is not limited, for example, it may be an aluminum-plastic film. "Heat exchange between the reinforcing separator 2 and the pouch cell 1" means that the reinforcing separator 2 is configured to exchange heat with the electrode assemblies within the pouch cell 1 through the pouch casing 11 it contacts. That is, the reinforcing separator 2 can form heat exchange with the electrode assemblies within the pouch casing 11 it contacts. It is understood that the intermediate medium for heat transfer between the reinforcing separator 2 and the electrode assemblies includes, but is not limited to, the pouch casing 11, for example, it may be the pouch casing 11 and the electrolyte (solid or liquid form).

[0190] Therefore, on the one hand, 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 and improve the reliability of the soft-pack cell 1; on the other hand, by utilizing the heat transfer characteristic of the reinforcing separator 2, the reinforcing separator 2 can also play a role in heat dissipation and temperature equalization for the soft-pack cell 1, thereby optimizing the performance and service life of the soft-pack cell 1; and thirdly, by placing the reinforcing separator 2 between adjacent soft-pack cells 1, the mutual influence between adjacent soft-pack cells 1 on both sides of the reinforcing separator 2 can be reduced, such as the influence of force or heat, thereby improving the overall reliability of the battery device 100.

[0191] The connection method and location of "connection between the reinforcing partition 2 and the box 20" are not limited. For example, the connection method can be direct or indirect, detachable or non-detachable fixed, and the connection location can be at least one of the top, side or bottom of the box 20.

[0192] Therefore, by connecting the reinforcing partition 2 to the housing 20, the reinforcing partition 2 can be fixed, effectively supporting the pouch cell 1 and improving the rigidity of the cell array 10, thereby increasing the overall rigidity of the battery device 100. Furthermore, by providing heat exchange between the reinforcing partition 2 and the pouch cell 1, and by connecting the reinforcing partition 2 to the housing 20, a heat transfer path can be formed at the connection point. This allows the pouch cell 1 to transfer heat to the housing 20 through the reinforcing partition 2, improving the heat dissipation efficiency of the pouch cell 1.

[0193] In some embodiments, referring to FIG7, the thickness T1 of the reinforcing partition 2 is less than the thickness T2 of the pouch cell 1.

[0194] In the above technical solution, by setting the thickness of the reinforcing separator 2 to be less than the thickness of the soft-pack cell 1, the space occupied by the reinforcing separator 2 in the housing 20 can be reduced, which is beneficial to improving the energy density of the battery device 100.

[0195] For example, the thickness of the reinforcing partition 2 is 0.8mm to 2.0mm. For instance, the thickness of the reinforcing partition 2 can be 0.8mm, 0.9mm, 1mm, 1.3mm, 1.5mm, 2mm, etc.

[0196] In the above technical solution, by setting the thickness of the reinforcing separator 2 to 0.8mm to 2.0mm, the reinforcing separator 2 is not too small, and can have good support strength to stably and reliably support the soft-pack cell 1. Moreover, the thickness of the reinforcing separator 2 is not too large, thereby reducing the space occupied by the reinforcing separator 2. That is, the reinforcing separator 2 can reduce the space occupied while meeting the support requirements, which is beneficial to improving the energy density of the battery device 100.

[0197] It is worth noting that the material of the reinforcing partition 2 is not limited. For example, the reinforcing partition 2 can be a metal plate, that is, it can be made of metal. Therefore, by using a metal material to process the reinforcing partition 2, the reinforcing partition 2 can have sufficient support capacity with a small thickness, and can also have good thermal conductivity, which is conducive to the reliable support of the soft-pack battery cell 1 and rapid heat exchange.

[0198] For example, when the reinforcing partition 2 is a metal plate, the reinforcing partition 2 can be an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate, etc. These materials are low in cost and easy to obtain, and can have good support strength and heat exchange performance even with a thinner thickness.

[0199] Of course, this application is not limited to this. The reinforcing partition 2 can also be made of other materials with good thermal conductivity, such as high-strength ceramic materials, thermally conductive plastics, carbon materials, etc.

[0200] In some embodiments, the reinforcing partition 2 is a solid structure. That is, the reinforcing partition 2 is not hollow, or in other words, the reinforcing partition 2 does not have any kind of holes, flow channels or cavities 21 (but the material itself may have pores).

[0201] In the above technical solution, by setting the reinforcing partition 2 as a solid structure, that is, in the form of a solid plate, the reinforcing partition 2 can have better strength, improve the reliability of supporting the soft-pack battery cell 1, and enable the soft-pack battery cell 1 to obtain more stable and reliable support. This is more conducive to improving the problem of force transmission between adjacent soft-pack battery cells 1 (referring to the soft-pack battery cells 1 on both sides of the reinforcing partition 2) and reducing the squeezing between adjacent soft-pack battery cells 1 (referring to the soft-pack battery cells 1 on both sides of the reinforcing partition 2).

[0202] In some embodiments, referring to FIG8, FIG8 is a cross-sectional view of a reinforcing partition 2 provided in some embodiments of the present application; a cavity 21 is formed inside the reinforcing partition 2. That is, the reinforcing partition 2 is not a solid structure. It is worth noting that the cavity 21 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.

[0203] In the above technical solution, by providing a cavity 21 within the reinforcing partition 2, the reinforcing partition 2 can absorb the expansion force of the pouch cell 1 using the cavity 21, thus providing expansion space and preventing excessive compression of the pouch cell 1 when it expands too much, thereby improving the reliability of the cell array 10. Furthermore, when the cell array 10 is subjected to collisions, the cavity 21 can absorb the collision force, protecting the pouch cell 1.

[0204] In some embodiments, referring to Figures 6 and 8, the cavity 21 includes heat exchange channels 211 for distributing the heat exchange medium. That is, some cavities 21 can circulate or store the heat exchange medium. In this case, the reinforcing partition 2 can exchange heat with the pouch cell 1 using its own material, or it can exchange heat with the pouch cell 1 through the heat exchange medium in the heat exchange channels 211, or it can simultaneously exchange heat with the pouch cell 1 using both the material of the reinforcing partition 2 itself and the heat exchange medium in the heat exchange channels 211, thereby enabling a flexible design of the reinforcing partition 2.

[0205] In the above technical solution, the reinforcing separator 2 can exchange heat with the pouch cell 1 using the heat exchange medium within the heat exchange channel 211. By selecting and controlling the heat exchange medium, the thermal management performance of the reinforcing separator 2 on the pouch cell 1 can be optimized. Furthermore, the heat exchange channel 211 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.

[0206] In some embodiments, referring to Figures 6 and 8, the heat exchange channel 211 extends from one end of the reinforcing partition 2 to the other end of the reinforcing partition 2. That is, the heat exchange channel 211 extends through the reinforcing partition 2, and the heat exchange channel 211 forms openings at both ends along the length of the reinforcing partition 2. In this way, the heat exchange medium can enter the heat exchange channel 211 through one opening, then flow through the entire length of the reinforcing partition 2, and exit the heat exchange channel 211 through the other opening. Thus, by setting the heat exchange channel 211 to extend from one end of the reinforcing partition 2 to the other end of the reinforcing partition 2, the heat exchange performance between the reinforcing partition 2 and the pouch cell 1 along the entire length can be improved.

[0207] It is worth noting that the extension direction of the heat exchange channel 211 is not limited. For example, it can extend along a straight line parallel to the length direction of the reinforcing partition 2, thereby facilitating the processing of the reinforcing partition 2, such as by extrusion molding. Alternatively, in other embodiments, the heat exchange channel 211 can also extend along an oblique line inclined to the length direction of the reinforcing partition 2, or it can extend along a wavy line or a serrated line, in which case the reinforcing partition 2 can be processed by splicing or other methods.

[0208] In some embodiments, referring to Figure 8, a reinforcing rib 22 is provided inside the cavity 21. It is worth noting that the location and shape of the reinforcing rib 22 are not limited and can be specifically set according to the support requirements.

[0209] In the above technical solution, by setting a reinforcing rib 22 in the cavity 21, the reinforcing separator 2 can have a cavity 21 in the cavity, so that the reinforcing separator 2 has better support strength, improves the support reliability of the reinforcing separator 2 for the soft pack cell 1, and can reduce the weight of the reinforcing separator 2 and reduce the material cost of the reinforcing separator 2 while ensuring support reliability, thus achieving lightweighting and cost reduction of the battery device 100.

[0210] Referring to Figure 9, Figure 9 is a schematic diagram of the cooperation between the pouch cell 1 and the reinforcing separator 2 provided in some embodiments of this application.

[0211] In some embodiments, the length direction of the reinforcing partition 2 extends along the length direction of the pouch cell 1, that is, the length direction of the reinforcing partition 2 is consistent with the length direction of the pouch cell 1, the thickness direction of the reinforcing partition 2 is consistent with the thickness direction of the pouch cell 1, and therefore the width direction of the reinforcing partition 2 is also consistent with the width direction of the pouch cell 1. The thickness direction of the pouch cell 1 is the first direction F1, the length direction of the pouch cell 1 is the second direction F2, and the width direction of the pouch cell 1 is the third direction F3. Thus, the reinforcing partition 2 can cover the pouch cell 1 to a large extent without occupying much space, thereby improving the support and heat exchange effect of the pouch cell 1.

[0212] For example, referring to Figure 9, the length L2 of the reinforcing separator 2 is greater than 80% of the length L1 of the pouch cell 1. Here, "length of the pouch cell 1" refers to the length of the main body of the pouch cell 1, excluding the portion of the pouch cell 1 extending beyond the pouch casing 11 (such as the portion of the conductive element 12 extending beyond the pouch casing 11, as described later). For example, the length L2 of the reinforcing separator 2 may be greater than 80%, 81%, 82%, 84%, 85%, 90%, 100%, 120%, 150%, 170%, 200%, 210%, 220%, 230%, 240%, etc., of the length L1 of the pouch cell 1.

[0213] In the above technical solution, by setting the length L2 of the reinforcing partition 2 to be greater than 80% of the length L1 of the soft-pack battery cell 1, the soft-pack battery cell 1 and the reinforcing partition 2 can have a larger heat transfer surface and support surface in the length direction of the soft-pack battery cell 1. This allows the reinforcing partition 2 to cover a large part of the area in the length direction of the soft-pack battery cell 1, so that the reinforcing partition 2 can provide better support, heat transfer and separation for the soft-pack battery cell 1.

[0214] For example, referring to Figure 9, the width W2 of the reinforcing partition 2 is greater than 80% of the width W1 of the pouch cell 1. Here, "width of the pouch cell 1" refers to the width of the main body portion of the pouch cell 1, excluding the portion of the pouch cell 1 extending beyond the pouch casing 11 (such as the portion of the conductive element 12 extending beyond the pouch casing 11, as described later). For example, the width W2 of the reinforcing partition 2 may be greater than 80%, 81%, 82%, 84%, 85%, 90%, 100%, etc., of the width W1 of the pouch cell 1.

[0215] In the above technical solution, by setting the width W2 of the reinforcing partition 2 to be greater than 80% of the width W1 of the soft-pack battery cell 1, the soft-pack battery cell 1 and the reinforcing partition 2 can have a larger heat transfer surface and support surface in the width direction of the soft-pack battery cell 1. This allows the reinforcing partition 2 to cover a large part of the area in the width direction of the soft-pack battery cell 1, and enables the reinforcing partition 2 to provide better support, heat transfer and separation for the soft-pack battery cell 1.

[0216] For example, referring to Figure 9, the length L2 of the reinforcing partition 2 is greater than 80% of the length L1 of the pouch cell 1, and the width W2 of the reinforcing partition 2 is greater than 80% of the width W1 of the pouch cell 1. This allows the reinforcing partition 2 to cover a large area of ​​the pouch cell 1 in both the length and width directions, thus providing better support, heat transfer, and separation for the pouch cell 1.

[0217] In some embodiments, referring to FIG10, FIG10 is a schematic diagram of multiple cell rows 10 provided in some embodiments of the present application, wherein multiple adjacent cell rows 10 arranged along the length direction of the pouch cell 1 share a reinforcing partition 2. For example, there may be two, three, or four cell rows 10 arranged along the length direction of the pouch cell 1.

[0218] In the above technical solution, by arranging two cell rows 10 along the length of the pouch cell 1, the energy density of the battery device 100 can be improved. Compared with the solution using a single, longer pouch cell, this embodiment can reduce the length of a single pouch cell 1, thereby reducing the processing difficulty of a single pouch cell 1. Moreover, by strengthening the sharing of the separator 2, the number of reinforcing separators 2 can be reduced, and the overall structural stability can be improved.

[0219] For example, referring to FIG10, the length L2 of the reinforcing separator 2 is greater than twice the length L1 of the pouch cell 1, so that two adjacent cell rows 10 arranged along the length direction of the pouch cell 1 (e.g., the second direction F2 shown in the figure) share the reinforcing separator 2. For example, the length L2 of the reinforcing separator 2 is greater than 2.1 times, 2.2 times, 2.3 times, 2.4 times, 2.5 times, 2.6 times, etc., the length L1 of the pouch cell 1.

[0220] In the above technical solution, by setting the length of the reinforcing partition 2 to be greater than twice the length of the pouch cell 1, two adjacent cell rows 10 arranged along the length direction of the pouch cell 1 can share the reinforcing partition 2. This allows the reinforcing partition 2 to simultaneously support two adjacent pouch cells 1 arranged along the length direction of the pouch cell 1. Moreover, the reinforcing partition 2 shared along the length direction of the pouch cell 1 can provide a larger range of more effective and sufficient support and heat exchange for each pouch cell 1.

[0221] Of course, this application is not limited to this. At least three adjacent cell rows 10 arranged along the length direction of the soft-pack cell 1 (e.g., the second direction F2) can share a reinforcing partition 2. In this case, the length of the reinforcing partition 2 can be increased accordingly, which will not be elaborated here.

[0222] In some embodiments, referring to FIG9, the width W1 of the reinforcing partition 2 is smaller than the width W2 of the pouch cell 1.

[0223] Therefore, by setting the width of the reinforcing separator 2 to be smaller than the width of the pouch cell 1, the reinforcing separator 2 is less likely to extend beyond the pouch cell 1 in the width direction, thus avoiding the occupation of space in the width direction of the pouch cell 1. This facilitates the arrangement of other components of the battery device 100, such as the heat exchange plate 9 mentioned later, on the width side of the pouch cell 1.

[0224] Furthermore, when the width W1 of the reinforcing partition 2 is less than the width W2 of the pouch cell 1, and the width W2 of the reinforcing partition 2 is greater than 80% of the width W1 of the pouch cell 1, the reinforcing partition 2 can effectively support and heat exchange the pouch cell 1, while also reducing unnecessary space occupation.

[0225] In some embodiments, the reinforcing partition 2 is bonded to the pouch cell 1. For example, the reinforcing partition 2 can be fixed to the pouch shell 11 of the adjacent pouch cell 1 by adhesive, wherein the adhesive method is not limited, for example, it can be glued by applying glue or double-sided tape.

[0226] Therefore, the reinforcing separator 2 is bonded to the adjacent pouch cell 1, making the connection simple and reliable, and allowing the reinforcing separator 2 to exchange heat stably with the pouch cell 1. In addition, the adhesive layer occupies less space, allowing the reinforcing separator 2 and the pouch cell 1 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.

[0227] For example, the reinforcing partition 2 and the flexible battery cell 1 are bonded and fixed together by double-sided adhesive. For instance, when assembling the battery cell array 10, double-sided adhesive can be placed between the flexible battery cell 1 and the reinforcing partition 2. For example, the double-sided adhesive can be first bonded and fixed to one of the flexible battery cell 1 and the reinforcing partition 2, and then bonded to the other, thereby achieving the bonding and fixing of the flexible battery cell 1 and the reinforcing partition 2 by double-sided adhesive.

[0228] Therefore, by bonding the reinforcing partition 2 to the adjacent soft-pack battery cell 1 with double-sided adhesive, the problem of adhesive overflow can be avoided, the space occupied by the overflowing adhesive can be prevented, and the subsequent cleaning process for the overflowing adhesive can be eliminated. Of course, if the overflowing adhesive problem can be controlled and the uniformity of the thermally conductive adhesive distribution can be controlled, the soft-pack battery cell 1 and the reinforcing partition 2 can also be set to be bonded with thermally conductive adhesive.

[0229] In some embodiments, referring to FIG24, the cell array 10 includes a plurality of reinforcing partitions 2 arranged along the thickness direction of the pouch cell 1. The reinforcing partitions 2 are arranged adjacent to each other along the thickness direction of the pouch cell 1 and are located on both sides of at least one pouch cell 1 in the thickness direction of the pouch cell 1. Two reinforcing partitions 2 are connected by a connecting plate 6 located in the outer peripheral region of the pouch cell 1.

[0230] Therefore, by setting the connecting plate 6, the reliability of the reinforcing partition 2 in supporting the soft-pack battery cell 1 can be improved, and the setting position of the connecting plate 6 does not interfere with the soft-pack battery cell 1.

[0231] For example, the second direction F2 can be the length direction of the soft-pack battery cell 1, the third direction F3 can be the width direction of the soft-pack battery cell 1, and the first direction F1 is the thickness direction of the soft-pack battery cell 1. Both sides in the width direction and both sides in the length direction of the soft-pack battery cell 1 belong to the outer peripheral area of ​​the soft-pack battery cell 1. The connecting plate 6 can be set at any of these positions. For example, the connecting plate 6 can be set on one side in the width direction of the soft-pack battery cell 1, thereby avoiding the connection part 23 described later.

[0232] 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.

[0233] For example, in some embodiments, the connecting plate 6 is disposed between the two reinforcing partitions 2 to which it is connected, and is integrally connected with the two reinforcing partitions 2 to form a U-shaped shell. This eliminates the need for the process of connecting the connecting plate 6 to the reinforcing partitions 2, improving the reliability of the connection between the connecting plate 6 and the reinforcing partitions 2.

[0234] In some embodiments, a reinforcing partition 2 is sandwiched between each pair of adjacent pouch cells 1 in the cell stack 10. Thus, by providing a reinforcing partition 2 between each pair of adjacent pouch cells 1 in the cell stack 10, each pouch cell 1 can receive support and heat exchange from the reinforcing partition 2, thereby more fully optimizing the reliability and performance of the cell stack 10.

[0235] In some embodiments, a plurality of pouch cells 1 are sandwiched between two adjacent reinforcing partitions 2 in the cell array 10. For example, when the plurality of pouch cells 1 in the cell array 10 are arranged along a first direction F1, a plurality of pouch cells 1 are sandwiched between two adjacent reinforcing partitions 2 along the first direction F1. That is, no further reinforcing partitions 2 are provided between the plurality of pouch cells 1 sandwiched between two adjacent reinforcing partitions 2, so that not every two adjacent pouch cells 1 in the cell array 10 are sandwiched between reinforcing partitions 2. In the above technical solution, the number of reinforcing partitions 2 can be reduced, and the cost of using reinforcing partitions 2 can be reduced.

[0236] For example, when multiple pouch cells 1 are sandwiched between two adjacent reinforcing partitions 2 in the cell array 10, the number of pouch cells 1 sandwiched between the two adjacent reinforcing partitions 2 in the cell array 10 can be less than or equal to four. For example, when multiple pouch cells 1 in the cell array 10 are arranged along the first direction F1, the number of pouch cells 1 sandwiched between two adjacent reinforcing partitions 2 along the first direction F1 can be less than or equal to four. For example, the number of pouch cells 1 sandwiched between two adjacent reinforcing partitions 2 along the first direction F1 can be four, three, or two.

[0237] Therefore, the number of soft-pack battery cells 1 between two adjacent reinforcing partitions 2 is set to be less than or equal to four, so that the arrangement of soft-pack battery cells 1 between two adjacent reinforcing partitions 2 is more appropriate, avoiding the problem that the number of soft-pack battery cells 1 between two reinforcing partitions 2 is too large and exceeds the support capacity of the reinforcing partitions 2, so that each soft-pack battery cell 1 between two reinforcing partitions 2 can be reliably supported by the two reinforcing partitions 2.

[0238] In some embodiments, referring again to FIG6, a buffer 3 is sandwiched between at least two adjacent pouch cells 1 in the cell array 10, and the stiffness of the buffer 3 is less than the stiffness of the pouch shell 11.

[0239] Therefore, by setting a buffer 3 between two adjacent soft-pack cells 1, and the stiffness of the buffer 3 is less than that of the soft-pack outer shell 11, the buffer 3 can provide expansion space to the soft-pack cell 1, so that the buffer 3 can effectively absorb the expansion deformation of the soft-pack cell 1 and the vibration under external impact, etc., making the overall structure stability of the cell array 10 better.

[0240] The material of the buffer 3 is not limited. For example, it can be a foam layer or a silicone layer. Buffers 3 made of these materials have better absorption capacity and are relatively low in weight and cost, which is beneficial to the lightweight and low-cost design of the battery device 100.

[0241] For example, the pouch cell 1 and the buffer 3 can be bonded together or abutted together. For example, they can be bonded together by applying adhesive or double-sided tape. When using double-sided tape, the problem of adhesive overflow can be avoided. Of course, if the problem of adhesive overflow can be controlled and the uniformity of the thermally conductive adhesive distribution can be controlled, the pouch cell 1 and the buffer 3 can also be set to be bonded together by thermally conductive adhesive.

[0242] In some embodiments, referring to FIG11, FIG11 is a partial schematic diagram of a cell array 10 provided in some embodiments of the present application; at least two adjacent pouch cells 1 in the cell array 10 are provided with a buffer 3 and a reinforcing partition 2 simultaneously. For example, a buffer 3 and a reinforcing partition 2 may be provided between every two adjacent pouch cells 1 in the cell array 10. Alternatively, some adjacent pouch cells 1 in the cell array 10 may be provided with a buffer 3 and a reinforcing partition 2 simultaneously, while at most one of the buffer 3 and the reinforcing partition 2 may be provided between the remaining adjacent pouch cells 1.

[0243] In the above technical solution, when a buffer 3 and a reinforcing partition 2 are simultaneously provided between two adjacent soft-pack battery cells 1, the cooperation between the reinforcing partition 2 and the buffer 3 effectively separates the two adjacent soft-pack battery cells 1, providing both buffering and support functions, thereby improving the reliability of the battery cell array 10. For example, the reinforcing partition 2 and the buffer 3 can be bonded and fixed, or they can be abutted together.

[0244] When a buffer element 3 and a reinforcing partition 2 are simultaneously provided between two adjacent pouch cells 1, the buffer element 3 is sandwiched between the two adjacent reinforcing partitions 2 to form a partition group, which is located between the two adjacent pouch cells 1. In this way, the pouch cells 1 located on both sides of the buffer element 3 can also be well cooled.

[0245] In some embodiments, referring to FIG12, FIG12 is a partial schematic diagram of a cell array 10 provided in other embodiments of the present application; at most one of a buffer member 3 and a reinforcing partition 2 is provided between any two adjacent pouch cells 1 in the cell array 10. That is, only a buffer member 3, only a reinforcing partition 2, or neither a buffer member 3 nor a reinforcing partition 2 may be provided between any two adjacent pouch cells 1 in the cell array 10. In other words, the buffer member 3 and the reinforcing partition 2 cannot be provided simultaneously between two adjacent pouch cells 1.

[0246] In the above technical solution, by setting at most one of the buffer 3 and the reinforcing separator 2 between any two adjacent pouch cells 1 in the cell array 10, the distance between two adjacent pouch cells 1 can be reduced, the compactness of the fit between adjacent pouch cells 1 can be improved, and the energy density of the battery device 100 can be increased. In addition, there is no need to consider the fit between the reinforcing separator 2 and the buffer 3, thus simplifying the assembly.

[0247] In some embodiments, referring to FIG12, at least one pouch cell 1 in the cell array 10 is sandwiched between the buffer 3 and the reinforcing partition 2. That is, one or more pouch cells 1 in the cell array 10 may be sandwiched between the buffer 3 and the reinforcing partition 2.

[0248] In the above technical solution, the soft-pack battery cell 1 sandwiched between the buffer 3 and the reinforcing partition 2 can not only be supported and heat exchanged by the reinforcing partition 2 on one side, but also buffered by the buffer 3 on the other side, thereby improving the reliability and performance of the soft-pack battery cell 1.

[0249] It is worth noting that the arrangement of the reinforcing separator 2 and the buffer 3 in the cell array 10 can be flexibly and conveniently selected, so that the buffer 3 and the reinforcing separator 2 can provide good support, heat exchange and buffer for each soft-pack cell 1 in the cell array 10, thereby improving the reliability of the battery device 100.

[0250] For example, referring to FIG12, the buffer 3 and the reinforcing partition 2 in the cell array 10 are alternately arranged. For example, when multiple pouch cells 1 in the cell array 10 are arranged along the thickness direction of the pouch cells 1, the buffer 3 and the reinforcing partition 2 are alternately arranged along the thickness direction of the pouch cells 1. That is, in the thickness direction of the pouch cells 1, each pouch cell 1 in the cell array 10 is sandwiched between the buffer 3 and the reinforcing partition 2, and a reinforcing partition 2 is provided between two adjacent buffer 3s, and a buffer 3 is provided between two adjacent reinforcing partitions 2.

[0251] Therefore, a buffer 3 or a reinforcing partition 2 is arranged between two adjacent soft-pack cells 1 in the cell stack 10. The buffer 3 and the reinforcing partition 2 are arranged alternately, so that the arrangement of the reinforcing partition 2 and the buffer 3 in the cell stack 10 is more balanced, and each soft-pack cell 1 in the cell stack 10 can obtain stable and reliable support, heat exchange and buffering effect.

[0252] In some embodiments, the buffer 3 covers more than 80% of the area of ​​the thickness-side surface of the pouch cell 1 (i.e., the side surface of the pouch cell 1 facing the buffer 3). For example, the buffer 3 may cover 80%, 81%, 82%, 84%, 85%, 90%, 100%, etc. of the thickness-side surface area of ​​the pouch cell 1.

[0253] In the above technical solution, by setting the buffer 3 to cover more than 80% of the surface area of ​​the thickness side of the soft-pack battery cell 1, the soft-pack battery cell 1 and the buffer 3 can form a large buffer mating area, thereby improving the buffering effect of the buffer 3 on the soft-pack battery cell 1, so that the soft-pack battery cell 1 can be buffered to a greater extent and improve the reliability of the soft-pack battery cell 1.

[0254] In some embodiments, the buffer 3 is not limited to being located between adjacent pouch cells 1. For example, the cell array 10 may have buffer 3 at both ends in the first direction F1. In this way, all the pouch cells 1 in the cell array 10 can be sandwiched between the buffer 3 at both ends, which helps to reduce space occupation, increase the energy density of the battery device 100, and achieve a buffering effect.

[0255] Figure 13 is a schematic diagram of the connection between the cell array 10 and the mounting bracket 8 provided in some embodiments of this application; Figure 14 is an enlarged view of part C shown in Figure 13; Figure 15 is an enlarged view of part F shown in Figure 4; Figure 16 is a schematic diagram of the battery device 100 provided in some embodiments of this application; Figure 17 is a cross-sectional view along line EE shown in Figure 16; Figure 18 is an enlarged view of part D shown in Figure 17.

[0256] In some embodiments, referring to FIG3 and in conjunction with FIGS. 13-15, the battery device 100 includes a housing 20 for loading the cell array 10. The edge of the reinforcing separator 2 has a connecting portion 23 protruding from the pouch cell 1, which is used to form a connection with the housing 20. Specifically, when the reinforcing separator 2 is connected to the housing 20, the pouch cell 1 itself can be connected to the housing 20, for example, by potting, or the pouch cell 1 may not be connected to the housing 20.

[0257] In the above technical solution, by setting a reinforcing partition 2 connected to the housing 20, a reliable connection between the battery cell array 10 and the housing 20 can be achieved, thereby improving the connection reliability between the battery cell array 10 and the housing 20.

[0258] In some embodiments, when the area of ​​the side surface of the pouch cell 1 facing the housing 20 (e.g., the side surface of the pouch cell 1 in the width direction) is small, making it difficult to achieve a reliable connection between the pouch cell 1 and the housing 20, the connection between the reinforcing partition 2 and the housing 20 can be improved, thereby enhancing the connection reliability between the cell array 10 and the housing 20 and enabling the pouch cell 1 to work stably and reliably.

[0259] Of course, this application is not limited to this. For example, in other embodiments of this application, the larger surface of the soft-pack battery cell 1 (e.g., one side surface of the soft-pack battery cell 1 in the thickness direction) may be oriented towards the housing 20.

[0260] In some embodiments, referring to Figures 14 and 18, 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 the connecting part 23 is connected to the mounting bracket 8. 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.

[0261] In the above technical solution, by setting a mounting bracket 8 inside the housing body 7, and connecting the reinforcing partition 2 and the housing 20 through 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 set 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 battery cell array 10.

[0262] The material of the mounting bracket 8 is not limited, for example, it can be made of metal, which can improve the connection strength. The connection method between the box body 7 and the mounting bracket 8 is not limited, for example, it can be screwed, riveted, welded, etc.

[0263] In some embodiments, as shown in Figures 13 and 14, the pouch cells 1 in the cell array 10 are arranged along the thickness direction (e.g., the first direction F1) of the pouch cells 1. The pouch cells 1 are vertically arranged, that is, the width direction (e.g., the third direction F3) of the pouch cells 1 is vertical, the length direction (e.g., the second direction F2) of the pouch cells 1 is horizontal, and the mounting bracket 8 is located on one side of the length direction (e.g., the second direction F2) of the pouch cells 1.

[0264] It is understandable that, as arranged above, the thickness direction of the soft-pack battery cell 1 is horizontal, and the multiple soft-pack battery cells 1 in the battery cell row 10 are arranged in a horizontal direction. The mounting bracket 8 and the soft-pack battery cells 1 are also arranged in a horizontal direction.

[0265] Therefore, both the cell array 10 and the mounting bracket 8 can reduce the vertical space occupied, which is beneficial to improving the vertical structural compactness of the battery device 100, reducing the vertical dimensions of the battery device 100, and facilitating its placement in locations with limited vertical space (such as under a vehicle). Furthermore, there is no vertical stacking relationship between the individual pouch cells 1 in the cell array 10, improving the consistency of each pouch cell 1 in the cell array 10. Moreover, the positioning of the mounting bracket 8 facilitates connection with each reinforcing separator 2 in the cell array 10, thereby improving the reliability and stability of the mounting bracket 8 in fixing the cell array 10.

[0266] For example, referring to FIG13, when the battery device 100 includes a plurality of such cell rows 10, the plurality of cell rows 10 can be arranged along the thickness direction and / or length direction of the pouch cell 1, thereby further reducing the occupation of vertical space.

[0267] In some embodiments, as shown in FIG14, the upper end of the mounting bracket 8 is lower than the upper end of the soft-pack battery cell 1 to form an upper clearance space S1 above the mounting bracket 8, and the connecting part 23 is connected to the mounting bracket 8 at a position lower than the upper clearance space S1.

[0268] In the above technical solution, by reserving an upper clearance space S1 above the mounting bracket 8, other components of the battery device 100 can be arranged in the upper clearance space S1, such as wiring, thereby making full use of the space above the mounting bracket 8 and reducing the space occupied in other locations, which is conducive to improving the compactness and energy density of the battery device 100.

[0269] In some embodiments, as shown in Figures 14-18, the connecting portion 23 is connected to the upper part of the mounting bracket 8, and the lower end of the connecting portion 23 is higher than the lower end of the mounting bracket 8, so as to form a lower clearance space S2 below the connecting portion 23. The soft-pack battery cell 1 has a conductive element 12 electrically connected to the electrode assembly, and at least a portion of the conductive element 12 is exposed outside the soft-pack housing 11 and located in the lower clearance space S2.

[0270] In the above technical solution, by setting the connecting part 23 to be relatively small in the vertical direction and positioned higher than the mounting bracket 8, a lower clearance space S2 can be formed below the connecting part 23. This lower clearance space S2 can accommodate the conductive component 12 of the soft-pack battery cell 1, thereby making full use of the space below the connecting part 23 and reducing the space occupied in other positions, which is beneficial to improving the compactness and energy density of the battery device 100.

[0271] In some embodiments, referring to Figures 14-18, the upper end of the mounting bracket 8 is lower than the upper end of the pouch cell 1 to form an upper clearance space S1 above the mounting bracket 8. The connecting portion 23 is connected to the mounting bracket 8 at a position lower than the upper clearance space S1. At the same time, the connecting portion 23 is connected to the upper part of the mounting bracket 8, and the lower end of the connecting portion 23 is higher than the lower end of the mounting bracket 8 to form a lower clearance space S2 below the connecting portion 23. The pouch cell 1 has a conductive member 12 electrically connected to the electrode assembly. At least a portion of the conductive member 12 is exposed outside the pouch casing 11 and located in the lower clearance space S2.

[0272] In this way, by setting the soft-pack battery cell 1 vertically and setting the connecting part 23 to be relatively small in size in the vertical direction and positioned higher than the mounting bracket 8, empty spaces are formed above and below the connecting part 23, which can make full use of the space inside the battery device 100, reduce the space occupied in other positions, and help improve the energy density of the battery device 100.

[0273] In some embodiments, referring to FIG14, a mounting bracket 8 is connected to at least two connecting parts 23.

[0274] Therefore, by setting a mounting bracket 8 to connect with at least two connecting parts 23, the number of mounting brackets 8 used can be reduced to a certain extent, the number of parts can be reduced, and the assembly efficiency can be improved.

[0275] In some embodiments, referring to FIG14, the mounting bracket 8 includes a plurality of sidewalls 81 spaced apart along the arrangement direction of the pouch cells 1 in the cell array 10 (e.g., the first direction F1 shown in the figure). Each sidewall 81 corresponds to a connecting portion 23, and the connecting portion 23 is connected to the sidewall 81. Thus, the mounting bracket 8 can reduce its space occupation while satisfying the connection with the connecting portion 23, and can also minimize the material cost of the mounting bracket 8, achieving lightweight design.

[0276] In some embodiments, referring to FIG14, there are multiple mounting brackets 8 arranged along the arrangement direction of the pouch cells 1 in the cell array 10 (e.g., the first direction F1 shown in the figure). Each mounting bracket 8 includes two sidewalls 81 and a connecting wall 82 connecting the two sidewalls 81. Adjacent sidewalls 81 of two adjacent mounting brackets 8 clamp the same connecting portion 23. It is worth noting that the connecting portion 23 clamped by two adjacent sidewalls 81 can be connected to both sidewalls 81 respectively, or it can be connected to only one of the sidewalls 81.

[0277] This reduces the processing difficulty of a single mounting bracket 8 and facilitates flexible connection between the pouch cell 1 and the mounting bracket 8. Multiple mounting brackets 8 can be molded independently, and adjacent mounting brackets 8 can be connected or disconnected, for example, by welding, using structural adhesive, or using fasteners.

[0278] In some embodiments, referring to Figures 3 and 13, one of the length direction and the width direction of the housing 20 is a first direction F1, and the other is a second direction F2. The height direction of the housing 20 is a third direction F3. The soft-pack cells 1 in the cell array 10 are arranged along the first direction F1, where the first direction F1 is the thickness direction of the soft-pack cells 1, the second direction F2 is the length direction of the soft-pack cells 1, and the third direction F3 is the width direction of the soft-pack cells 1. The housing 20 is provided with mounting brackets 8 at both ends in the second direction F2.

[0279] Therefore, the arrangement of the mounting bracket 8 is not only conducive to connecting with each reinforcing partition 2, but also does not easily lead to an increase in the height dimension of the box 20, thus ensuring that the height dimension of the box 20 is relatively small.

[0280] In some embodiments, referring to Figures 3, 13 and 14, each end of the housing 20 in the second direction F2 is provided with a plurality of mounting brackets 8 arranged along the first direction F1.

[0281] Therefore, by providing multiple mounting brackets 8, it is convenient to flexibly connect with multiple reinforcing partitions 2, reducing the difficulty of connecting the reinforcing partitions 2 and the mounting brackets 8. The form of the mounting brackets 8 is not limited; for example, the above-described embodiment can be referenced, but it is not limited to the above-described embodiment.

[0282] In some embodiments, referring to Figures 3 and 13, a battery module 101 is provided inside the housing 20. The battery module 101 includes two cell rows 10 arranged along the second direction F2, wherein all the pouch cells 1 in each cell row 10 are stacked sequentially along the thickness direction of the pouch cells 1; the ends of the two cell rows 10 in the same battery module 101 that are far apart from each other in the second direction F2 are respectively connected to the mounting brackets 8 on the corresponding sides. As a result, the length of a single pouch cell 1 can be reduced, and the processing difficulty of a single pouch cell 1 can be reduced.

[0283] In some embodiments, referring to Figures 3 and 13, the reinforcing separator 2 extends along the second direction F2, and its two ends extend to the two ends of the battery module 101 in the second direction F2, so that the two cell rows 10 in the battery module 101 share the reinforcing separator 2. The two ends of the reinforcing separator 2 are respectively connected to the mounting brackets 8 at the two ends of the housing 20 in the second direction F2. For example, during production, the two cell rows 10 can be connected into a whole first, and then the two ends of each reinforcing separator 2 can be connected to the mounting brackets 8 respectively.

[0284] For example, the second direction F2 is the left and right direction. The left end of the housing 20 is provided with a mounting bracket 8, and the right end of the housing 20 is also provided with a mounting bracket 8. The two cell rows 10 in the battery module 101 are arranged in the left and right direction. The left end of the reinforcing partition 2 extends to the left end of the cell row 10 on the left side, and the right end of the reinforcing partition 2 extends to the right end of the cell row 10 on the right side. The left end of the reinforcing partition 2 is connected to the mounting bracket 8 on the left end of the housing 20, and the right end of the reinforcing partition 2 is connected to the mounting bracket 8 on the right end of the housing 20.

[0285] Therefore, the relatively long length of the reinforcing separator 2 reduces the number of reinforcing separators 2 and improves the overall stability of the battery module 101. Furthermore, it eliminates the need for mounting brackets 8 between the two cell rows 10 in the battery module 101, thereby reducing the number of mounting brackets 8 used, improving assembly efficiency, and lowering production costs.

[0286] It is worth noting that the battery module 101 can be one or multiple arranged along the first direction F1. In this way, the box body 20 beams and the like can be arranged at intervals of multiple battery modules 101 along the first direction F1.

[0287] In some embodiments, referring to Figures 5 and 6, the pouch cell 1 includes a conductive element 12, which is electrically connected to the electrode assembly and is at least partially exposed outside the pouch housing 11; two adjacent pouch cells 1 in the cell array 10 are connected by the conductive element 12.

[0288] Therefore, by setting two adjacent pouch cells 1 to be connected by a conductive element 12, the connection of multiple pouch cells 1 in the cell array 10 can be simplified, which is conducive to realizing the electrical connection of the pouch cells 1 in the battery device 100.

[0289] In some embodiments, referring to Figures 5 and 6, two conductive elements 12 that form a connection are overlapped, and at least one conductive element 12 is in a bent shape.

[0290] Therefore, by setting the two conductive elements 12 that constitute the connection to overlap, the two conductive elements 12 can have a larger connection area, thus making the connection between the two conductive elements 12 more stable and reliable. Moreover, by setting at least one conductive element 12 to a bent shape, the two soft-pack battery cells 1 connected by the conductive elements 12 can be stacked along the thickness direction. Furthermore, this connection method can simplify the structure, reduce the number of parts, and improve assembly efficiency.

[0291] For example, the two conductive elements 12 constituting the connection can overlap and be directly connected by welding or bonding. Overlapping of the two conductive elements 12 means that the two conductive elements 12 have a certain overlapping area. For example, one conductive element 12 can extend in a straight line, and the other conductive element 12 can be bent towards the first conductive element 12 to overlap with it; or both conductive elements 12 can be bent, meaning they can bend towards each other and overlap.

[0292] Alternatively, in some other embodiments, referring to FIG11, the two conductive elements 12 constituting the connection are connected by an adapter piece 13, which is in a curved shape.

[0293] Therefore, by connecting adjacent pouch cells 1 in the cell array 10 via adapter pieces 13, and by designing the adapter pieces 13 to be curved, the design of the conductive element 12 can be simplified, the length of the conductive element 12 can be shortened, and the processing steps and procedures for the conductive element 12 during the connection of the pouch cells 1 can be reduced, thereby improving production efficiency. Furthermore, it allows two pouch cells 1 connected via the conductive element 12 to be stacked along the thickness direction. In addition, standardized adapter pieces 13 can be used for rapid and efficient connection processing, making the connection of multiple pouch cells 1 more convenient and efficient, and further increasing the production efficiency of the cell array 10.

[0294] For example, both conductive elements 12 forming the connection extend in a straight line, and the adapter piece 13 extends toward the two conductive elements 12 through its own curved shape and overlaps with the two conductive elements 12 respectively. Alternatively, at least one conductive element 12 can be configured with a curved shape that matches the adapter piece 13 to increase the overlap connection area between the two.

[0295] In some embodiments, the bending shape is U-shaped or C-shaped. This results in a simple structure, ease of processing and forming, reduced stress concentration, improved structural quality, and lower risk of breakage, making the connection between the two pouch cells 1 more stable and reliable, and improving conductivity. Furthermore, the U-shape reduces space requirements compared to the C-shape.

[0296] Figure 19 is a schematic diagram of the cell array 10 provided in some embodiments of this application; Figure 20 is a state diagram of the two soft-pack cells 1 in the cell array 10 in Figure 19 before they are folded in half.

[0297] In some embodiments, referring to FIG19, conductive elements 12 are respectively provided at both ends of the pouch cell 1 in the length direction, and the conductive elements 12 at adjacent ends of two adjacent pouch cells 1 in the length direction are connected.

[0298] It is understandable that the length, width, and thickness directions of each soft-pack cell 1 in the cell array 10 are consistent, and the soft-pack cells 1 in the cell array 10 are arranged along the thickness direction of the soft-pack cells 1. The adjacent ends of two adjacent soft-pack cells 1 in the cell array 10 refer to the ends that are close to each other in the length direction. For example, the length direction of each soft-pack cell 1 in the cell array 10 is the left-right direction. The left end of a soft-pack cell 1 and the left end of the soft-pack cell 1 adjacent to it are adjacent ends. Similarly, the right end of a soft-pack cell 1 and the right end of the soft-pack cell 1 adjacent to it are adjacent ends.

[0299] Therefore, by setting conductive elements 12 at both ends of the pouch cell 1 along its length, and connecting the conductive elements 12 at adjacent ends of two adjacent pouch cells 1 along their length, the occupancy of the pouch cell 1 in the width direction can be reduced. When the width direction is vertical, it is beneficial to reduce the occupancy of vertical space, reduce the vertical dimension of the battery device 100, and increase the vertical energy density of the battery device 100.

[0300] In some embodiments, when conductive elements 12 are provided at both ends of the length direction of the soft-pack battery cell 1, and the conductive elements 12 at adjacent ends of two adjacent soft-pack battery cells 1 are connected, the polarities of the two conductive elements 12 at both ends of the length direction of the soft-pack battery cell 1 can be set to be opposite, and the polarities of the two conductive elements 12 that form the connection are the same or opposite.

[0301] Therefore, series and / or parallel connections can be implemented as needed, allowing the battery device 100 to be flexibly configured.

[0302] For example, both conductive elements 12 that form the connection can be positive, so that parallel connection between pouch cells 1 can be achieved by connecting conductive elements 12 with the same polarity; or, for example, one of the two conductive elements 12 that form the connection is positive and the other is negative, so that series connection between pouch cells 1 can be achieved by connecting conductive elements 12 with opposite polarities.

[0303] For example, the positive electrodes of multiple pouch cells 1 in the cell array 10 are arranged on the same side in the length direction, and the negative electrodes are arranged on the other side in the length direction of the pouch cells 1. In this way, two adjacent pouch cells 1 can be connected in parallel through conductive members 12 with the same polarity on the same side.

[0304] Alternatively, by way of example, when the conductive elements 12 arranged on the same side of the length direction of multiple pouch cells 1 in the cell array 10 alternate between positive and negative, then two adjacent pouch cells 1 can be connected in series by conductive elements 12 with opposite polarities on the same side.

[0305] Alternatively, by way of example, the arrangement of the positive and negative electrodes of the multiple pouch cells in the cell array 10 can be made more flexible and complex as needed. For example, at least two adjacent conductive elements 12 located on the same side have the same polarity, and at least two adjacent conductive elements 12 located on the same side have opposite polarities. In this way, multiple pouch cells 1 can be connected to form a series-parallel hybrid connection through the conductive elements 12 on the same side.

[0306] In some embodiments, referring to Figures 19 and 20, the cell array 10 includes at least three pouch cells 1, and in the cell array 10, among the two conductive elements 12 of the pouch cell 1 located between two adjacent pouch cells 1, one conductive element 12 is connected to the conductive element 12 on the same side of the adjacent pouch cell 1, and the other conductive element 12 is connected to the conductive element 12 on the same side of the adjacent other pouch cell 1.

[0307] Therefore, multiple soft-pack battery cells 1 can be arranged in a row along the length of the soft-pack battery cell 1, and each pair of adjacent conductive parts 12 can be connected. Then, the connection of the conductive parts 12 can be bent so that multiple soft-pack battery cells 1 can be arranged in a row along the thickness direction, thereby simplifying the processing and improving production efficiency.

[0308] For example, if three soft-pack cells 1 are provided in the cell array 10, the soft-pack cell 1 located in the middle in the thickness direction of the soft-pack cell 1 is called the middle cell, and the other two soft-pack cells 1 can be called adjacent cells. When four soft-pack cells 1 are provided in the cell array 10, the soft-pack cell 1 located in the middle among the three adjacent soft-pack cells 1 is called the middle cell, and the two soft-pack cells 1 adjacent to it can be called adjacent cells. The conductive part 12 at one end of the length direction of the middle cell is connected to the conductive part 12 on the same side of an adjacent cell, and the conductive part 12 at the other end of the length direction of the middle cell is connected to the conductive part 12 on the same side of another adjacent cell. Thus, the multiple soft-pack cells 1 in the cell array 10 can be connected end to end, so that the multiple soft-pack cells 1 can be connected easily and conveniently, making the cell array 10 more efficient and convenient to assemble.

[0309] In some embodiments, referring to Figures 3 and 4, the battery device 100 includes a housing 20 for loading cell arrays 10, and a battery module 101 is disposed within the housing 20. The battery module 101 includes two cell arrays 10 arranged along the length direction of the pouch cells 1, wherein all the pouch cells 1 in each cell array 10 are stacked sequentially along the thickness direction of the pouch cells 1; the conductive members 12 of the two cell arrays 10 in the same battery module 101 are connected on the side of the pouch cells 1 that are close to each other in the length direction.

[0310] This allows for the series and / or parallel connection of multiple cell arrays 10, thereby simplifying the electrical connections within the entire battery device 100.

[0311] For example, if two cell arrays 10 are arranged in a left-right direction, the pouch cells 1 in the two cell arrays 10 are arranged adjacent to each other in the left-right direction. Taking two adjacent pouch cells 1 in the two cell arrays 10 as an example, the conductive element 12 at the right end of one pouch cell 1 in the cell array 10 on the left is connected to the conductive element 12 at the left end of one pouch cell 1 in the cell array 10 on the right, for example, by overlapping. Furthermore, depending on the series or parallel connection requirements, the polarities of these two conductive elements 12 can be set to be the same or opposite. Therefore, the structure is simple, the connection is convenient and easy, and the steps and processes of bending the conductive elements 12 of adjacent pouch cells 1 for connection during production can be reduced, making the production efficiency of the cell arrays 10 higher.

[0312] In some embodiments, referring to Figures 3 and 14, the battery device 100 includes a housing 20 for loading the cell array 10, and the edge of the reinforcing separator 2 has a connecting portion 23 protruding from the pouch cell 1 along the length direction of the pouch cell 1. The connecting portion 23 is used to form a connection with the housing 20 and is spaced apart from the conductive member 12 along the width direction of the pouch cell 1.

[0313] Therefore, space can be fully utilized, spatial compactness can be improved, and the space occupied in the width direction of the soft-pack cell 1 can be reduced. When the width direction is vertical, it is beneficial to reduce the vertical space occupied, reduce the vertical dimension of the battery device 100, and increase the vertical energy density of the battery device 100.

[0314] In some embodiments, referring to Figures 21 and 22, 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] In some embodiments, 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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.

[0332] In some embodiments, referring to Figures 2, 3, and 16-18, the battery device 100 includes a housing 20 for mounting the cell array 10. The housing 20 includes cover plates 71 disposed on both sides of the cell array 10 along the height direction of the housing 20. The cover plates 71 on both sides are a top plate 712 and a bottom plate 711, respectively. The housing 20 also includes a heat exchange plate 9, which is disposed between the cell array 10 and the cover plates 71 and is used for heat exchange with the cell array 10. Thus, the heat exchange plate 9 can easily exchange heat with multiple pouch cells 1, thereby enabling the cell array 10 to obtain a good heat exchange effect, allowing the cell array 10 to operate stably and reliably, and thus making the battery device 100 operate more stably.

[0333] For example, the width direction of the pouch cell 1 is consistent with the height direction of the housing 20, both being vertical. The heat exchange plate 9 can be a liquid cooling plate. The heat exchange plate 9 is arranged on at least one side of the pouch cell 1 in the width direction. For example, the heat exchange plate 9 can be arranged on one side of the pouch cell 1 in the width direction. Alternatively, the heat exchange plate 9 can be arranged on both sides of the pouch cell 1 in the width direction. When the battery device 100 is working, the heat generated by the pouch cells 1 in the cell stack 10 is dissipated through the heat exchange plate 9. When the cell stack 10 needs to be heated, the heat exchange plate 9 can transfer the heat to the pouch cells 1 in the cell stack 10.

[0334] In some embodiments, referring to FIG18, the width direction of the pouch cell 1 is consistent with the height direction of the housing 20, and the surface of the pouch shell 11 facing the heat exchange plate 9 in the width direction of the pouch cell 1 is flat and connected to the heat exchange plate 9 through a heat-conducting medium.

[0335] For example, when the two membrane portions 111 are integral and have sealing structures 112 on one long side and two wide sides around the soft-pack battery cell 1, the sealing structure 112 may not be formed on the side of the soft-pack outer shell 11 facing the heat exchange plate 9. After the soft-pack outer shell 11 is folded, the fold lines of the two membrane portions 111 face the heat exchange plate 9.

[0336] For example, the thermally conductive medium can be thermally conductive adhesive, such as thermally conductive structural adhesive; the thermally conductive medium can be thermally conductive pad, such as a rubber pad; when the battery cell array 10 is assembled with the heat exchange plate 9, the thermally conductive adhesive or thermally conductive pad can be pre-applied to the side surface of the heat exchange plate 9 that mates with the soft housing 11; the battery cell array 10 can be arranged as a whole on the heat exchange plate 9 and fixedly connected to the heat exchange plate 9 by the thermally conductive adhesive or thermally conductive pad.

[0337] In this embodiment, the surface of the soft-pack outer shell 11 facing the heat exchange plate 9 is set as a plane, which can make the soft-pack outer shell 11 and the heat exchange plate 9 have a stable mating contact surface. This allows the soft-pack outer shell 11 to be stably and reliably fixed to the heat exchange plate 9 by thermally conductive adhesive or thermally conductive pads. This makes the assembly and fixing of the soft-pack battery cell 1 on the heat exchange plate 9 more convenient and stable, and makes the assembly and fixing of the battery cell array 10 and the heat exchange plate 9 more reliable, thereby improving the heat exchange reliability.

[0338] In some embodiments, referring to Figures 2, 3, and 16-18, the battery device 100 includes a housing 20 for mounting the cell array 10. The housing 20 includes cover plates 71 disposed on both sides of the cell array 10 along the height direction of the housing 20. The cover plates 71 on both sides are a top plate 712 and a bottom plate 711, respectively. The housing 20 also includes a heat exchange plate 9, which is disposed between the cell array 10 and the bottom plate 711 and is used for heat exchange with the cell array 10. A mounting bracket 8 is disposed on the top of the heat exchange plate 9.

[0339] Therefore, by setting the mounting bracket 8 on the top of the heat exchange plate 9, the mounting bracket 8 can exchange heat with the heat exchange plate 9, avoiding the heat from being concentrated on the mounting bracket 8, thereby improving the overall heat dissipation effect of the battery device 100.

[0340] The mounting bracket 8 and the heat exchange plate 9 can be fixedly connected, for example by fasteners or by structural adhesive, or the mounting bracket 8 can simply be placed on the heat exchange plate 9 without any fixing between them.

[0341] In some embodiments, the battery device 100 includes a housing 20 for mounting the cell array 10. The housing 20 includes a top plate 712 and a bottom plate 711 disposed on both sides of the cell array 10 along the height direction of the housing 20. The width direction of the pouch cell 1 is consistent with the height direction of the housing 20, and structural adhesive is used to fill the space between the cell array 10 and the bottom plate 711. This improves the rigidity of the pouch cell 1 along the height direction of the housing 20.

[0342] For example, the structural adhesive is a thermally conductive adhesive, which facilitates heat dissipation of the pouch cell 1. In this embodiment, a heat exchange plate 9 may be provided between the base plate 711 and the cell array 10, or the heat exchange plate 9 may not be provided. When the heat exchange plate 9 is provided, the structural adhesive can be filled between the base plate 711 and the heat exchange plate 9, and between the heat exchange plate 9 and the cell array 10.

[0343] In some embodiments, referring to FIG25, the housing 20 is provided with a baffle strip 5, and the cover plate 71 includes a base 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 5 is located between the mating gap and the base plate 711. In this embodiment, a heat exchange plate 9 may be provided between the base plate 711 and the cell array 10, or a heat exchange plate 9 may not be provided. When a heat exchange plate 9 is provided, the baffle strip 5 may be provided between the heat exchange plate 9 and the soft-pack cell 1. When a heat exchange plate 9 is not provided, the baffle strip 5 may be provided between the base plate 711 and the soft-pack cell 1.

[0344] In the above technical solution, the adhesive-blocking strip 5 can prevent the structural adhesive from overflowing between adjacent soft-pack cells 1, reducing the probability of local hard structures formed by adhesive overflow between adjacent soft-pack cells 1, thereby improving the problem of local stress concentration between adjacent soft-pack cells 1 and reducing the risk of damage to soft-pack cells 1.

[0345] For example, the adhesive strip 5 can avoid the bottom of the soft-pack battery cell 1, so that a heat-conducting area can be formed between the bottom of the soft-pack battery cell 1 and the base plate 711.

[0346] In some embodiments, two adjacent pouch cells 1 share a single adhesive strip 5.

[0347] In the above technical solution, by having two adjacent soft-pack cells 1 share a single adhesive strip 5, the number of adhesive strips 5 can be reduced, which is beneficial to improving assembly efficiency.

[0348] In some embodiments, the adhesive strip 5 is adhesive-blocking foam, and the adhesive strip 5 is bonded to the base plate 711; or, the adhesive strip 5 is a strip with adhesive on one side, and the adhesive strip 5 is bonded to the bottom of the soft-pack battery cell 1.

[0349] In the above technical solution, the adhesive-blocking foam has good compressibility. By squeezing the adhesive-blocking strip 5 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 5 can be bonded to the base plate 711, which facilitates the installation and fixing of the adhesive-blocking strip 5; or, by setting the adhesive-blocking strip 5 as an adhesive strip with adhesive on one side, it is convenient to bond the adhesive-blocking strip 5 to the bottom of the soft-pack battery cell 1, so that the adhesive-blocking strip 5 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.

[0350] In some embodiments, referring to FIG. 26, the reinforcing separator 2 is an inverted T-shaped or L-shaped structure, and includes a first portion 24 located between adjacent pouch cells 1 and a second portion 25 located below the pouch cell 1, the second portion 25 being located between the bottom of the pouch cell 1 and the base plate 711. For example, the second portion 25 may extend from the lower end of the first portion 24 toward one side in the thickness direction of the pouch cell 1, so that the reinforcing separator 2 is formed as an L-shaped structure (e.g., the left reinforcing separator 2 shown in FIG. 26). Alternatively, for example, the second portion 25 may also extend from the lower end of the first portion 24 toward both sides in the thickness direction of the pouch cell 1, so that the reinforcing separator 2 is formed as an inverted T-shaped structure (e.g., the right reinforcing separator 2 shown in FIG. 26).

[0351] In this way, the second part 25 can be wrapped in structural adhesive, so that the bottom of the soft-pack battery cell 1, the second part 25 and the base plate 711 are fixed by structural adhesive. This can increase the connection and heat transfer area between the reinforcing partition 3 and the housing 20, improve the yield of rigid support, and when the reinforcing partition 3 is an inverted T-shaped structure, the second part 25 can form a mating gap between the bottom of the adjacent soft-pack battery cell 1 and the base plate 711, preventing the structural adhesive from overflowing between the adjacent soft-pack battery cells 1, reducing the probability of the adjacent soft-pack battery cells 1 forming a local hard structure due to adhesive overflow, thereby improving the problem of local stress concentration between adjacent soft-pack battery cells 1 and reducing the risk of damage to the soft-pack battery cells 1.

[0352] For example, the second part 25 can avoid the area directly beneath the bottom of the pouch cell 1 (e.g., the reinforcing partition 2 on the right side shown in FIG. 26), thereby allowing a direct heat-conducting area to be formed between the area directly beneath the pouch cell 1 and the base plate 711. Alternatively, the second part 25 can also block the area directly beneath the bottom of the pouch cell 1 (e.g., the reinforcing partition 2 on the left side shown in FIG. 26), thereby allowing indirect heat transfer between the area directly beneath the pouch cell 1 and the base plate 711 through the second part 25.

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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).

[0357] 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.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.).

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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.

[0366] 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.

[0367] 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.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] 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.

[0373] 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%.

[0374] 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%.

[0375] 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.

[0376] 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.

[0377] 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.

[0378] 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.).

[0379] 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.

[0380] 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.

[0381] 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.

[0382] 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.

[0383] 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%.

[0384] 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%.

[0385] 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%.

[0386] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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.

[0391] Porous base membranes may include one or more of polyethylene and polypropylene.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] In some embodiments, the pouch cell 1 further includes an electrolyte.

[0396] 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.

[0397] 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.

[0398] 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.

[0399] 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.

[0400] 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.).

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] Other configurations and operations of the battery device 100 in this embodiment are known to those skilled in the art and will not be described in detail here.

[0406] Secondly, embodiments of this application also provide an electrical device, including a battery device 100 of any of the above-described solutions.

[0407] In the above technical solution, since the performance of the battery device 100 is improved, it is beneficial to improve the working power consumption performance of the power-consuming device.

[0408] The following describes a battery device 100 according to a specific embodiment of the present application.

[0409] The battery device 100 includes: a cell array 10 and a housing 20. The cell array 10 is disposed inside the housing 20. The length direction of the housing 20 is a first direction F1, the width direction of the housing 20 is a second direction F2, and the height direction of the housing 20 is a third direction F3.

[0410] The housing 20 contains two battery modules 101 arranged along the second direction F2. Each battery module 101 includes two cell rows 10 arranged along the first direction F1. Each cell row 10 includes multiple pouch cells 1 arranged along the first direction F1. The length direction of the pouch cells 1 extends along the second direction F2, and the width direction of the pouch cells 1 extends along the third direction F3. The first direction F1 is the thickness direction of the pouch cells 1.

[0411] The cell array 10 also includes a reinforcing partition 2 and a buffer 3, which are alternately arranged along a first direction F1. The length direction of the reinforcing partition 2 is consistent with the length direction of the pouch cell 1, and the width direction of the reinforcing partition 2 is consistent with the width direction of the pouch cell 1. The length direction of the buffer 3 is consistent with the length direction of the pouch cell 1, and the width direction of the buffer 3 is consistent with the width direction of the pouch cell 1.

[0412] The reinforcing partition 2 is made of aluminum plate and is bonded to the soft-pack battery cell 1 with double-sided adhesive. The reinforcing partition 2 is sandwiched between two adjacent soft-pack battery cells 1, and the number of reinforcing partitions 2 sandwiched between two adjacent soft-pack battery cells 1 is one, so that the two adjacent soft-pack battery cells 1 share the rigidity of the reinforcing partition 2. The buffer 3 is sandwiched between two adjacent soft-pack battery cells 1, and the number of buffers 3 sandwiched between two adjacent soft-pack battery cells 1 is one, so that the two adjacent soft-pack battery cells 1 share the expansion space provided by the buffer 3.

[0413] The bottom of the pouch cell 1 and the bottom plate 711 of the housing 20 are connected together with structural adhesive to ensure the connection rigidity below. The reinforcing partition 2 is fixedly connected to the upper end of the mounting bracket 8 through the connecting part 23. The mounting bracket 8 and the housing body 7 are mechanically connected (screwed, riveted, or welded, etc.) to ensure the connection rigidity above. Adjacent pouch cells 1 are connected by conductive parts 12. The conductive parts 12 and the connecting parts 23 are arranged along the third direction F3 to make full use of the space in the third direction F3 and save space occupied in other directions. As a result, the rigidity of the pouch cell 1 in the length, width, and thickness directions is improved, and the reliability of the battery device 100 is improved.

[0414] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0415] 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: Box; A cell array is bonded to the housing, and the cell array includes multiple soft-pack cells stacked along the thickness direction; In the cell array, a reinforcing partition is provided between the large surfaces of at least two adjacent pouch cells. The reinforcing partition is connected to the housing. The stiffness of the reinforcing partition is greater than the stiffness of the pouch shell of the pouch cell. The reinforcing partition exchanges heat with the pouch cell.

2. The battery device according to claim 1, wherein, The battery device includes a housing for loading the battery cells, and the edge of the reinforcing partition has a connecting portion protruding from the pouch cells, the connecting portion being used to form a connection with the housing.

3. The battery device according to claim 2, wherein, The enclosure includes an enclosure body and a mounting bracket. The mounting bracket is installed inside the enclosure body, and the connecting part is connected to the mounting bracket.

4. The battery device according to claim 3, wherein, The pouch cells in the cell array are arranged along the thickness direction of the pouch cells, the width direction of the pouch cells is vertical, the length direction of the pouch cells is horizontal, and the mounting bracket is located on one side of the length direction of the pouch cells.

5. The battery device according to claim 4, wherein, The upper end of the mounting bracket is lower than the upper end of the soft-pack battery cell to form an upper clearance space above the mounting bracket, and the connecting part is connected to the mounting bracket at a position lower than the upper clearance space.

6. The battery device according to claim 4 or 5, wherein, The connecting part is connected to the upper part of the mounting bracket, and the lower end of the connecting part is higher than the lower end of the mounting bracket to form a lower clearance space below the connecting part. The soft-pack battery cell has a conductive element that is electrically connected to the electrode assembly of the soft-pack battery cell. At least a portion of the conductive element is exposed outside the soft-pack outer shell and located in the lower clearance space.

7. The battery device according to any one of claims 3-6, wherein, One of the mounting brackets is connected to at least two of the connecting parts.

8. The battery device according to claim 7, wherein, The mounting bracket includes a plurality of sidewalls spaced apart along the arrangement direction of the pouch cells in the cell array, each sidewall corresponding to a connecting portion, and the connecting portion being connected to the sidewall.

9. The battery device according to claim 7, wherein, The mounting brackets are multiple and arranged along the arrangement direction of the pouch cells in the cell array. Each mounting bracket includes two side walls and a connecting wall connecting the two side walls. Adjacent side walls of two adjacent mounting brackets clamp the same connecting portion.

10. The battery device according to any one of claims 3-9, wherein, One of the length direction and the width direction of the housing is a first direction, and the other is a second direction. The height direction of the housing is a third direction. The soft-pack cells in the cell array are arranged along the first direction, which is the thickness direction of the soft-pack cells. The second direction is the length direction of the soft-pack cells, and the third direction is the width direction of the soft-pack cells. The housing is provided with mounting brackets at both ends in the second direction.

11. The battery device according to claim 10, wherein, The housing is provided with a plurality of mounting brackets arranged along the first direction at each end in the second direction.

12. The battery device according to claim 10 or 11, wherein, The housing contains a battery module, which includes two cell rows arranged along the second direction, wherein all the pouch cells in each cell row are stacked sequentially along the thickness direction of the pouch cells; the ends of the two cell rows in the same battery module that are far apart from each other in the second direction are respectively connected to the mounting brackets on the corresponding sides.

13. The battery device according to claim 12, wherein, The length of the reinforcing partition extends along the second direction, and both ends of the reinforcing partition extend to both ends of the battery module in the second direction, so that the two cell arrays in the battery module share the reinforcing partition. The two ends of the reinforcing partition are respectively connected to the mounting brackets at both ends of the housing in the second direction.

14. The battery device according to any one of claims 1-13, wherein, The battery device includes a housing for loading the battery cell array. The housing includes cover plates disposed on both sides of the battery cell array along the height direction of the housing. The cover plates on both sides are a top plate and a bottom plate, respectively. The housing also includes a heat exchange plate disposed between the battery cell array and the cover plates and used for heat exchange with the battery cell array.

15. The battery device according to claim 14, wherein, The width direction of the soft-pack battery cell is consistent with the height direction of the housing. The surface of the soft-pack outer shell facing the heat exchange plate in the width direction of the soft-pack battery cell is flat and connected to the heat exchange plate through a heat-conducting medium.

16. The battery device according to any one of claims 3-13, wherein, The battery device includes a housing for mounting the battery cell array. The housing includes cover plates disposed on both sides of the battery cell array along the height direction of the housing. The cover plates on both sides are a top plate and a bottom plate, respectively. The housing also includes a heat exchange plate disposed between the battery cell array and the bottom plate and used for heat exchange with the battery cell array. The mounting bracket is disposed on the top of the heat exchange plate.

17. The battery device according to any one of claims 1-16, wherein, The thickness of the reinforcing partition is less than the thickness of the pouch cell.

18. The battery device according to claim 17, wherein, The thickness of the reinforcing partition is 0.8mm to 2.0mm.

19. The battery device according to any one of claims 1-18, wherein, The reinforcing partition is a metal plate.

20. The battery device according to claim 19, wherein, The reinforcing partition is made of aluminum plate, aluminum alloy plate, copper plate or steel plate.

21. The battery device according to any one of claims 1-20, wherein, The reinforcing partition is a solid structure.

22. The battery device according to any one of claims 1-20, wherein, The reinforcing partition has a cavity formed inside.

23. The battery device according to claim 22, wherein, The cavity includes heat exchange channels for housing the heat exchange medium.

24. The battery device according to claim 23, wherein, The heat exchange channel extends from one end of the length of the reinforcing partition to the other end of the length of the reinforcing partition.

25. The battery device according to any one of claims 22-24, wherein, The cavity is equipped with reinforcing ribs.

26. The battery device according to any one of claims 1-25, wherein, The reinforcing separator extends along the length of the pouch cell, wherein the length of the reinforcing separator is greater than 80% of the length of the pouch cell; and / or, the width of the reinforcing separator is greater than 80% of the width of the pouch cell.

27. The battery device according to claim 26, wherein, Multiple adjacent cell rows arranged along the length of the pouch cell share the reinforcing partition.

28. The battery device according to claim 27, wherein, The length of the reinforcing partition is greater than twice the length of the pouch cell, so that two adjacent cell rows arranged along the length direction of the pouch cell can share the reinforcing partition.

29. The battery device according to claim 26, wherein, The width of the reinforcing partition is smaller than the width of the pouch cell.

30. The battery device according to any one of claims 1-29, wherein, The reinforcing partition is bonded to the soft-pack battery cell.

31. The battery device according to claim 30, wherein, The reinforcing partition is fixed to the soft-pack battery cell by double-sided adhesive.

32. The battery device according to any one of claims 1-31, wherein, The cell array includes a plurality of reinforcing partitions arranged along the thickness direction of the pouch cell. The reinforcing partitions are arranged adjacent to each other along the thickness direction and are located on both sides of at least one pouch cell in the thickness direction. Two of the reinforcing partitions are connected by a connecting plate located in the outer peripheral region of the pouch cell.

33. The battery device according to claim 32, wherein, The connecting plate is disposed between the two reinforcing partitions to which it is connected, and is integrally connected with the two reinforcing partitions to form a U-shaped shell.

34. The battery device according to any one of claims 1-33, wherein, The reinforcing partition is sandwiched between each pair of adjacent pouch cells in the cell array.

35. The battery device according to any one of claims 1-33, wherein, Multiple pouch cells are sandwiched between two adjacent reinforcing partitions in the cell array.

36. The battery device according to claim 35, wherein, The number of pouch cells sandwiched between two adjacent reinforcing partitions in the cell array is less than or equal to four.

37. The battery device according to any one of claims 1-36, wherein, A buffer is sandwiched between at least two adjacent pouch cells in the cell array, and the stiffness of the buffer is less than that of the pouch shell.

38. The battery device according to claim 37, wherein, The buffer and the reinforcing partition are provided simultaneously between at least two adjacent pouch cells in the cell array.

39. The battery device according to claim 38, wherein, The buffer is sandwiched between two adjacent reinforcing partitions to form a partition group, and the partition group is disposed between two adjacent soft-pack cells.

40. The battery device according to claim 37, wherein, At most one of the buffer and the reinforcing partition is provided between any two adjacent pouch cells in the cell array.

41. The battery device according to claim 37, wherein, At least one of the pouch cells in the cell stack is sandwiched between the buffer and the reinforcing partition.

42. The battery device according to claim 41, wherein, The buffer and the reinforcing partition are alternately arranged in the battery cell array.

43. The battery device according to any one of claims 37-42, wherein, The buffer covers more than 80% of the area of ​​the thickness side surface of the pouch cell; and / or, the buffer is a foam layer or a silicone layer.

44. The battery device according to any one of claims 1-36, wherein, The cell array has buffer members at both ends of the soft-pack cell in the thickness direction. The stiffness of the buffer members is less than that of the soft-pack outer shell. All the soft-pack cells in the cell array are sandwiched between the buffer members at both ends.

45. The battery device according to any one of claims 1-44, wherein, The pouch cell includes a conductive element that is electrically connected to the electrode assembly of the pouch cell and is at least partially exposed outside the pouch casing; two adjacent pouch cells in the cell array are connected through the conductive element.

46. ​​The battery device according to claim 45, wherein, The two conductive elements constituting the connection are overlapped, and at least one of the conductive elements is in a bent shape.

47. The battery device according to claim 45, wherein, The two conductive components forming the connection are connected by an adapter piece, which is in a curved shape.

48. The battery device according to any one of claims 45-47, wherein, The conductive element is provided at both ends of the pouch cell along its length, and the conductive elements at adjacent ends of two adjacent pouch cells along their length are connected.

49. The battery device according to claim 48, wherein, The two conductive elements at both ends of the pouch cell along its length have opposite polarities, and the two conductive elements that form a connection have the same or opposite polarities.

50. The battery device according to claim 48 or 49, wherein, The cell array includes at least three of the aforementioned pouch cells, and among the two conductive elements of the pouch cells located between two adjacent pouch cells in the cell array, one conductive element is connected to the conductive element on the same side of an adjacent pouch cell, and the other conductive element is connected to the conductive element on the same side of another adjacent pouch cell.

51. The battery device according to claim 48 or 49, wherein, The battery device includes a housing for loading the cell arrays, the housing containing a battery module, the battery module including two cell arrays arranged along the length direction of the pouch cells, wherein all the pouch cells in each cell array are stacked sequentially along the thickness direction of the pouch cells; the conductive elements of the two cell arrays in the same battery module on the adjacent sides of the pouch cells along the length direction are connected.

52. The battery device according to any one of claims 48-51, wherein, The battery device includes a housing for loading the battery cell array, and the edge of the reinforcing separator has a connecting portion that protrudes from the pouch cell along the length direction of the pouch cell. The connecting portion is used to form a connection with the housing and is spaced apart from the conductive element along the width direction of the pouch cell.

53. The battery device according to any one of claims 1-52, wherein, The pouch cell includes two membrane portions arranged and connected along the thickness direction of the pouch 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 pouch cell and together form the receiving cavity of the pouch cell. The electrode assembly of the pouch cell is disposed in the receiving cavity.

54. The battery device according to claim 53, 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.

55. The battery device according to claim 53 or 54, wherein, The two membrane portions are separate components and each has a sealing structure around the perimeter of the pouch cell.

56. The battery device according to claim 53 or 54, wherein, The two membrane portions are integral and have sealing structures on one long side and two wide sides around the pouch cell.

57. The battery device according to any one of claims 1-56, wherein, The battery device includes a housing for loading the battery cell array. The housing includes a top plate and a bottom plate disposed on both sides of the battery cell array along the height direction of the housing. The width direction of the pouch battery cell is consistent with the height direction of the housing. Structural adhesive is used to fill the space between the battery cell array and the bottom plate.

58. The battery device according to claim 57, wherein, The structural adhesive is a thermally conductive adhesive.

59. The battery device according to claim 58, wherein, The housing is equipped with a baffle strip, the bottom plate is located below the cell array, and a mating gap is formed between the bottoms of two adjacent soft-pack cells arranged along the thickness direction of the soft-pack cell. The baffle strip is located between the mating gap and the bottom plate.

60. The battery device according to claim 59, wherein, Two adjacent pouch cells share one of the sealing strips.

61. The battery device according to claim 60, 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.

62. The battery device according to claim 60, wherein, The reinforcing partition is an inverted T-shaped or L-shaped structure, and includes a first part located between adjacent pouch cells and a second part located below the pouch cells, the second part being located between the bottom of the pouch cells and the base plate.

63. The battery device according to any one of claims 1-62, wherein, The pouch cell is any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell.

64. The battery device according to claim 63, 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).

65. An electrical appliance, wherein, Includes the battery device according to any one of claims 1-64.

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