Battery pack, battery device, and electric device

Abstract

A battery pack (20), a battery device (100), and an electric device (100). The battery pack (20) comprises: a plurality of pouch battery cells (30) electrically connected in sequence, wherein each pouch battery cell (30) comprises a casing (31), an electrode assembly (32), and electrode leads (33); the electrode assembly (32) is arranged in the casing (31); the electrode leads (33) are electrically connected to the electrode assembly (32), and at least part of each electrode lead (33) is exposed outside the casing (31); the electrode leads (33) of two adjacent pouch battery cells (30) are directly connected.

Description

Battery packs, battery devices and electrical appliances Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack, battery device, and power supply device. Background Technology

[0002] In related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. Based on the rigidity of their casing, batteries can be broadly classified into pouch batteries and hard-shell batteries. Pouch batteries have the advantages of higher mass / volume energy density and better safety, making their application increasingly widespread.

[0003] When assembling multiple pouch cell batteries into a pack, the pouch cells need to be electrically connected to form the battery pack. In related technologies, the connection method between adjacent pouch cells within a battery pack is not conducive to further improving the energy density of the battery pack. Therefore, how to design the connection method between adjacent pouch cells in a battery pack to further improve the energy density of the battery pack is a technical problem that needs to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides a battery pack, a battery device, and an electrical device, wherein the electrical connection method between two adjacent pouch battery cells in the battery pack is beneficial to improving the energy density of the battery pack.

[0005] In a first aspect, this application provides a battery pack comprising: a plurality of pouch battery cells connected in sequence, wherein each pouch battery cell includes a housing, an electrode assembly, and electrode leads, the electrode assembly is disposed within the housing, the electrode leads are electrically connected to the electrode assembly and at least a portion of the electrode leads are exposed outside the housing, and the electrode leads of two adjacent pouch battery cells are directly connected.

[0006] In the above technical solution, by directly connecting the electrode leads of two adjacent pouch cell cells in the battery pack, the electrical connection devices between the pouch cell cells can be eliminated or reduced, the number of components in the battery pack can be reduced, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the battery pack. Furthermore, by eliminating or reducing the electrical connection devices between the pouch cell cells, the cost can also be reduced.

[0007] In some embodiments, the electrode leads of two adjacent pouch cell cells are welded together.

[0008] In the above technical solution, the electrode leads of two adjacent pouch cell cells in the battery pack are connected by welding, thereby realizing the direct connection of the terminals of two adjacent pouch cell cells in the battery pack. This makes the connection method of the electrode leads of two adjacent pouch cell cells in the battery pack simple and reliable.

[0009] In some embodiments, the electrode leads of two adjacent pouch cell cells are directly connected by conductive adhesive.

[0010] In the above technical solution, the electrode leads of two adjacent pouch cells in the battery pack are connected by conductive adhesive, thereby realizing the direct connection of the terminals of two adjacent pouch cells in the battery pack. This makes the connection method of the electrode leads of two adjacent pouch cells in the battery pack simple and reliable.

[0011] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, which is formed in a sheet shape.

[0012] In the above technical solution, the part of the electrode lead exposed on the outer shell is defined as the lead-out part. The electrode leads of two adjacent soft-pack battery cells are directly connected, which is actually the lead-out parts of the two electrode leads are directly connected. By setting the lead-out part as a sheet, the connection area between the two electrode leads can be larger, thereby improving the stability and reliability of the connection between the two electrode leads.

[0013] In some embodiments, the lead-out portion has rounded corners at both ends in the width direction of the pouch battery cell.

[0014] In the above technical solution, by making the two ends of the lead-out portion rounded, the risk of the lead-out portion scratching other structures or the human body can be reduced during the connection of the lead-out portions of the two electrode leads.

[0015] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, which is a flexible structure.

[0016] In the above technical solution, the portion of the electrode lead exposed on the outer shell is defined as the lead-out portion. The electrode leads of two adjacent pouch cell cells are directly connected, which is actually the lead-out portions of the two electrode leads are directly connected. By setting the lead-out portion as a flexible structure, the lead-out portion can be deformed. This allows the lead-out portion to be bent without bending or bent into a set shape as needed, making the connection of the lead-out portions of the two electrode leads more flexible, and also making the arrangement of multiple pouch cell cells in the battery pack more flexible.

[0017] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, and the thickness of the lead-out portion is 0.1 mm to 0.5 mm.

[0018] In the above technical solution, the portion of the electrode lead exposed on the outer shell is defined as the lead-out portion. The electrode leads of two adjacent pouch cells are directly connected, which is actually the lead-out portions of the two electrode leads are directly connected. By setting the thickness of the lead-out portion to 0.1mm to 0.5mm, the thickness of the lead-out portion can meet the requirements of excessive current, the structural strength of the lead-out portion can meet the requirements, and the lead-out portion can also have good flexibility, so as to reduce the difficulty of bending and deforming the lead-out portion when bending and deforming is required.

[0019] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, and the width of the lead-out portion in the width direction of the pouch cell is 20mm to 60mm.

[0020] In the above technical solution, the portion of the electrode lead exposed on the outer shell is defined as the lead-out portion. The electrode leads of two adjacent pouch cell cells are directly connected, which is actually the lead-out portions of the two electrode leads are directly connected. By setting the width of the lead-out portion in the width direction of the pouch cell to 20mm to 60mm, the width of the lead-out portion can better meet the requirements of excessive current, and the connection area of ​​the two electrode leads can be larger, thereby improving the stability and reliability of the connection between the two electrode leads.

[0021] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, and the length of the lead-out portion in the length direction of the pouch cell is 10mm to 50mm.

[0022] In the above technical solution, the portion of the electrode lead exposed outside the casing is defined as the lead-out portion. The electrode leads of two adjacent pouch cell cells are directly connected, which is actually the lead-out portions of the two electrode leads are directly connected. By setting the length of the lead-out portion in the length direction of the pouch cell to 10mm to 50mm, the width of the lead-out portion can better meet the requirements of excessive current, and the connection area of ​​the two electrode leads can be larger, thereby improving the stability and reliability of the connection between the two electrode leads.

[0023] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, which is an aluminum foil or a copper foil.

[0024] In the above technical solution, the part of the electrode lead exposed on the outer shell is defined as the lead-out part. The electrode leads of two adjacent soft-pack battery cells are directly connected, which is actually the lead-out parts of the two electrode leads are directly connected. By using aluminum foil or copper foil as the material of the lead-out part, the lead-out part can have good conductivity. In addition, it can also make the lead-out part have good flexibility, so as to reduce the difficulty of bending and deforming the lead-out part when bending and deforming is required.

[0025] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, the lead-out portion including a connecting segment, the connecting segments of two directly connected electrode leads being stacked and connected, the ratio of the length dimension of the connecting segment in the length direction of the pouch battery cell to the length dimension of the lead-out portion in the length direction of the pouch battery cell being 1 / 4 to 1 / 2.

[0026] In the above technical solution, the portion of the electrode lead exposed outside the casing is defined as the lead-out portion. The direct connection of the electrode leads of two adjacent pouch cells is essentially the direct connection of the lead-out portions of the two electrode leads. By making the ratio of the length of the overlapping portion of the two lead-out portions in the length direction of the pouch cell to the length of the lead-out portion in the length direction of the pouch cell 1 / 4 to 1 / 2, the overlapping connection length of the two electrode leads can be larger, improving the stability and reliability of the connection between the two electrode leads. Furthermore, a portion of the lead-out portion can be left to separate the overlapping connection portion of the two electrode leads from the casing, facilitating the direct connection operation of the two electrode leads.

[0027] In some embodiments, the two electrode leads of the pouch cell are located on opposite sides of the length of the pouch cell.

[0028] In the above technical solution, by positioning the two electrode leads of the pouch battery cell on opposite sides along the length of the pouch battery cell, multiple pouch battery cells can be connected in a long string when they are connected sequentially. The number of pouch battery cells in the battery pack is less restricted, allowing for battery packs with a small number of pouch battery cells as well as battery packs with a large number of pouch battery cells, making the number of pouch battery cells in the battery pack more flexible.

[0029] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion, the middle position in the width direction of the pouch battery cell is a width midpoint, and the lead-out portion is located on one side of the width midpoint in the width direction of the pouch battery cell to form a clearance space on the side of the lead-out portion near the width midpoint.

[0030] In the above technical solution, the portion of the electrode leads exposed on the outer shell is defined as the lead-out portion. The electrode leads of two adjacent pouch cell cells are directly connected, which is actually the lead-out portions of the two electrode leads are directly connected. By setting the lead-out portion on one side of the middle position in the width direction of the pouch cell, a clearance space can be formed on the side of the lead-out portion near the middle position of the width. This clearance space can make room for the arrangement of other structures, improve the compactness of the overall battery pack structure, and thus help to improve the energy density of the battery pack.

[0031] In some embodiments, a plurality of the pouch cell cells of the battery pack are connected in series.

[0032] In the above technical solution, by connecting multiple pouch cells in the battery pack in series, the output voltage of the battery pack can be made higher.

[0033] In some embodiments, the battery pack includes a thermal management component disposed on at least one side of the pouch cell in the thickness direction, the thermal management component being thermally connected to the pouch cell for heat exchange with the pouch cell.

[0034] In the above technical solution, by setting a thermal management component and placing the thermal management component on at least one side of the thickness direction of the pouch battery cell, the temperature of the pouch battery cell can be regulated by exchanging heat between the thermal management component and the pouch battery cell, thereby adjusting the temperature of the pouch battery cell to a suitable range.

[0035] In some embodiments, all the pouch cell batteries in the battery pack are arranged along the length of the pouch cell battery.

[0036] In the above technical solution, by arranging all the soft-pack battery cells along the length of the soft-pack battery cells, the arrangement of multiple soft-pack battery cells in the battery pack can be simplified, and the process of assembling multiple soft-pack battery cells into a battery pack can be simplified.

[0037] In some embodiments, all the pouch cell cells in the battery pack are divided into multiple sub-battery packs, which are arranged along the thickness direction of the pouch cell cells. Each sub-battery pack includes one pouch cell cell or multiple pouch cell cells arranged along the length direction of the pouch cell cell.

[0038] In the above technical solution, by dividing the multiple pouch battery cells of the battery pack into sub-battery packs arranged along the thickness direction of the pouch battery cells, the overall structure of the battery pack can be made compact, and the arrangement of the multiple pouch battery cells in the battery pack can be set as needed, making the arrangement of the multiple pouch battery cells in the battery pack more flexible.

[0039] In some embodiments, the portion of the electrode lead exposed outside the housing is a lead-out portion. The lead-out portions of two directly connected electrode leads in two adjacent sub-battery packs are connected and together form a connection portion, at least a portion of which is curved.

[0040] In the above technical solution, the exposed portion of the electrode lead on the outer shell is defined as the lead-out portion. The electrode leads of two adjacent pouch cell cells are directly connected, which is actually the lead-out portions of the two electrode leads are directly connected. By forming a connecting portion together with the lead-out portions of the two electrode leads that are directly connected in two adjacent battery packs, and setting the connecting portion to be curved, it is possible to conveniently arrange multiple sub-cells in the battery pack along the thickness direction of the pouch cell.

[0041] In some embodiments, in the connection direction of two directly connected electrode leads, the connection portion includes a plurality of straight segments connected in sequence, two adjacent straight segments are arranged at an angle and are connected by an arc segment, the arc segment extends along an arc, and the straight segment extends along a straight line.

[0042] In the above technical solution, by setting the connecting part, which is composed of two directly connected leads, to be curved, and by connecting adjacent straight segments of the connecting part with arc segments, the structure of sharp corners or edges of the connecting part can be reduced, and stress concentration at sharp corners or edges of the connecting part can be reduced.

[0043] In some embodiments, the connection point of the two directly connected electrode leads is located in the straight section.

[0044] In the above technical solution, by placing the connection point of the two directly connected electrode leads at the straight segment of the connection rather than the arc segment, the connection point of the two directly connected electrode leads can be located at a position with less stress, thereby reducing the impact of stress on the connection point of the electrode leads and improving the reliability and stability of the connection between the two directly connected electrode leads.

[0045] In some embodiments, the battery pack includes a reinforcing separator sandwiched between two adjacent pouch cell cells, the reinforcing separator having a harderness than the outer casing.

[0046] In the above technical solution, by setting a reinforcing separator between adjacent soft-pack battery cells and making the hardness of the reinforcing separator greater than that of the outer shell, it is convenient to group multiple soft-pack battery cells together. This can improve the overall rigidity of the battery pack formed by grouping multiple soft-pack battery cells together, thereby facilitating the installation of the battery pack formed by grouping multiple soft-pack battery cells together and reducing the deformation of the soft-pack battery cells after grouping.

[0047] In some embodiments, the thickness of the reinforcing partition is 0.8 mm to 2.0 mm.

[0048] In the above technical solution, by setting the thickness of the reinforcing separator to be no less than 0.8mm, the battery pack formed by multiple soft-pack battery cells can be effectively reinforced. At the same time, by setting the thickness of the reinforcing separator to be no more than 2.0mm, the space occupied by the reinforcing separator can be reduced while effectively reinforcing the battery pack, resulting in a higher energy density. By setting the thickness of the reinforcing separator to be between 0.8mm and 2.0mm, the overall strength and rigidity of the battery pack can be effectively improved, while the overall energy density of the battery pack can be higher.

[0049] In some embodiments, the reinforcing partition is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0050] In the above technical solution, by setting the reinforcing separator to materials such as aluminum plate, aluminum alloy plate, copper plate or steel plate, the reinforcing separator can have high strength and hardness, thereby better improving the overall rigidity of multiple soft-pack battery cells and better reducing the deformation of the assembled soft-pack battery cells.

[0051] In some embodiments, the reinforcing partition is a solid structure.

[0052] In the above technical solution, by setting the reinforcing separator as a solid structure, the reinforcing separator can have good structural strength and rigidity, and can play an effective strengthening role when the thickness of the reinforcing separator is small. This is beneficial to enable the battery pack to have good strength and rigidity as well as high volumetric energy density.

[0053] In some embodiments, a cavity is formed within the reinforcing partition.

[0054] In the above technical solution, by setting a cavity inside the reinforcing separator, the reinforcing separator can enhance the overall rigidity of the assembled pouch battery cells, while the cavity inside the reinforcing separator can absorb the expansion and deformation of the pouch battery cells. The cavity inside the reinforcing separator can provide a buffer for the deformation of adjacent pouch battery cells and help reduce the weight of the reinforcing separator.

[0055] In some embodiments, the cavity includes a heat exchange channel for the flow of the heat exchange medium.

[0056] In the above technical solution, at least a portion of the cavity inside the reinforcing separator constitutes a heat exchange channel. By allowing the heat exchange medium to flow through the heat exchange channel inside the reinforcing separator, the heat exchange medium can exchange heat with the individual soft-pack battery cells, thereby achieving effective regulation of the temperature of the individual soft-pack battery cells.

[0057] In some embodiments, the pouch cell is any one of lithium iron phosphate cell, ternary lithium cell, and solid-state cell.

[0058] In the above technical solutions, in embodiments where the pouch battery cell is a lithium iron phosphate battery cell, the safety of the pouch battery cell can be improved and the cycle life of the pouch battery cell can be extended; in embodiments where the pouch battery cell is a ternary lithium battery cell, the energy density of the pouch battery cell can be improved and the driving range can be increased; in embodiments where the pouch battery cell is a solid-state battery cell, not only the energy density can be improved, but also the safety can be improved.

[0059] In some embodiments, when the pouch cell is a lithium iron phosphate cell, the ratio of positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material of the pouch cell is 96:1-3:1-3; when the cell is a ternary lithium battery cell, the ratio of positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material of the pouch cell is 96:2-3:1-2.

[0060] In the above technical solutions, in embodiments where the pouch battery cell is a lithium iron phosphate battery cell, the positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material are formulated in the above ratio, which can improve the electrochemical performance and mechanical stability of the pouch battery cell; in embodiments where the pouch battery cell is a ternary lithium battery cell, the positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material are formulated in the above ratio, which can improve the energy density and cycle life of the battery.

[0061] Secondly, this application provides a battery device, including: a housing; and a battery pack disposed within the housing, wherein the battery pack is the battery pack described in the first aspect of this application.

[0062] In the above technical solution, the battery device includes the battery pack described above, which can eliminate or reduce the electrical connection devices between the individual pouch battery cells, reduce the number of components in the battery pack, thereby saving the space occupied by the electrical connection devices, which is conducive to improving the energy density of the battery pack, thus improving the density of the battery device, and also reduces the cost by eliminating or reducing the electrical connection devices between the individual pouch battery cells.

[0063] In some embodiments, the battery packs are multiple.

[0064] In the above technical solution, by including the above-mentioned multiple battery packs in the battery device, the battery device can have a large capacity and the overall energy density of the battery device can be high.

[0065] In some embodiments, at least a portion of the battery pack is arranged along a first direction, and the thickness direction of each individual pouch battery cell is all set along the first direction.

[0066] In the above technical solution, by arranging at least a portion of the multiple battery packs along the thickness direction of the pouch cell, the arrangement of the multiple battery packs in the battery device can be made more compact, which is beneficial to improving the energy density of the battery device.

[0067] In some embodiments, multiple battery packs are connected in series and / or in parallel.

[0068] In the above technical solutions, by connecting multiple battery packs in series, the battery device can have a higher output voltage; or, by connecting multiple battery packs in parallel, the battery device can have a higher output current; by arranging multiple battery packs in a mixed series and parallel configuration, the battery device can have both a higher output voltage and a higher output current.

[0069] In some embodiments, the thickness direction of each soft-pack battery cell is set along a first direction, the length direction of each soft-pack battery cell is set along a second direction, and the width direction of each soft-pack battery cell is set along a third direction. The first direction, the second direction, and the third direction intersect each other. The bottom plate and the top cover of the housing are located on opposite sides of the battery pack along the second direction.

[0070] In the above technical solution, by setting the thickness direction of multiple soft-pack battery cells along the first direction, the length direction of multiple soft-pack battery cells along the second direction, and the width direction of multiple soft-pack battery cells along the third direction, and by setting the bottom plate and top cover of the box on both sides of the second direction of the battery pack, the multiple soft-pack battery cells in the battery device can be arranged more compactly and the arrangement method is simple, which makes it convenient to assemble multiple soft-pack battery cells into the box after grouping them together.

[0071] In some embodiments, the housing has a receiving cavity for accommodating the battery pack, and the housing is provided with a constraint member extending along a first direction, the two ends of the constraint member in the length direction being respectively connected to two side walls of the receiving cavity along the first direction.

[0072] In the above technical solution, by setting a constraint member extending along the thickness direction of the soft-pack battery cell inside the housing, and connecting and fixing the two ends of the constraint member along the length direction to the housing respectively, the constraint member can tighten the two side walls of the receiving cavity along the first direction, thereby constraining and suppressing the expansion deformation of the soft-pack battery cell in its thickness direction.

[0073] In some embodiments, the two ends of the constraint member are connected and fixed to the housing by fasteners.

[0074] In the above technical solution, by fastening the two ends of the constraint member to the box body through the two ends of the fastener, the two ends of the constraint member can be more stably locked to the box body, so that the constraint member can better play the role of constraining and suppressing the expansion and deformation of the soft-pack battery cell in its thickness direction.

[0075] In some embodiments, the constraint member includes a constraint band and an insulating layer, wherein the constraint band is a metal component and the insulating layer covers the outer surface of the constraint band.

[0076] In the above technical solution, by setting the constraint member to include a constraint band and an insulating layer, and making the constraint band a metal part, the constraint member can have better structural strength, thereby enabling the constraint member to better constrain and suppress the expansion and deformation of the soft-pack battery cell in its thickness direction; and by making the outside of the constraint member a covered insulating layer, while making the constraint member a metal constraint band to better constrain and suppress the expansion and deformation of the soft-pack battery cell in its thickness direction, it is possible to avoid problems such as short circuits between the constraint member and the soft-pack battery cell and other components due to electrical contact.

[0077] In some embodiments, in a first direction, a reinforcing separator is sandwiched between at least two adjacent pouch cell units, the reinforcing separator being connected to the outer casing, and the hardness of the reinforcing separator being greater than that of the outer casing.

[0078] In the above technical solution, by setting a reinforcing separator between at least some of the adjacent two soft-pack battery cells and making the hardness of the reinforcing separator greater than that of the outer shell, it is convenient to group multiple soft-pack battery cells together, which can improve the overall rigidity of the group of multiple soft-pack battery cells, thereby facilitating the installation of the group of multiple soft-pack battery cells and reducing the deformation of the soft-pack battery cells after grouping.

[0079] In some embodiments, the thickness of the reinforcing separator is less than the thickness of the individual pouch cell.

[0080] In the above technical solution, by making the thickness of the reinforcing separator smaller than the thickness of the soft-pack battery cell, the overall rigidity of the multiple soft-pack battery cells can be improved while reducing the space occupied by the reinforcing separator. In particular, the space occupied by the reinforcing separator in the thickness direction of the soft-pack battery cell can be reduced, resulting in a higher overall energy density of the battery device.

[0081] In some embodiments, the reinforcing partition is a metal plate.

[0082] In the above technical solution, by setting the reinforcing separator as a metal plate, the reinforcing separator can have higher strength and hardness, thereby better improving the overall rigidity of the multiple soft-pack battery cells and better reducing the deformation of the assembled soft-pack battery cells.

[0083] In some embodiments, the reinforcing partition is a thermally conductive element and is thermally connected to the outer casing.

[0084] In the above technical solution, by setting the reinforcing separator as a heat-conducting component and making it heat-conductingly connected to the outer shell, the reinforcing separator can enhance the overall rigidity of the assembled pouch battery cells while also enabling the reinforcing separator to have a thermal management function. Through heat exchange between the reinforcing separator and the pouch battery cells, the temperature of the pouch battery cells can be adjusted, allowing the pouch battery cells to operate within a suitable temperature range.

[0085] In some embodiments, the reinforcing partition is a solid structure.

[0086] In the above technical solution, by setting the reinforcing separator as a solid structure, the reinforcing separator can have good structural strength and rigidity, and can play an effective strengthening role when the thickness of the reinforcing separator is small. This is beneficial to enable the battery pack to have good strength and rigidity as well as high volumetric energy density.

[0087] In some embodiments, a cavity is formed within the reinforcing partition.

[0088] In the above technical solution, by setting a cavity inside the reinforcing separator, the reinforcing separator can enhance the overall rigidity of the assembled pouch battery cells, while the cavity inside the reinforcing separator can absorb the expansion and deformation of the pouch battery cells. The cavity inside the reinforcing separator can provide a buffer for the deformation of adjacent pouch battery cells and help reduce the weight of the reinforcing separator.

[0089] In some embodiments, the cavity includes a heat exchange channel for the flow of the heat exchange medium.

[0090] In the above technical solution, at least a portion of the cavity inside the reinforcing separator constitutes a heat exchange channel. By allowing the heat exchange medium to flow through the heat exchange channel inside the reinforcing separator, the heat exchange medium can exchange heat with the individual soft-pack battery cells, thereby achieving effective regulation of the temperature of the individual soft-pack battery cells.

[0091] In some embodiments, a buffer layer is sandwiched between at least two adjacent pouch cell units, the hardness of which is less than that of the outer casing.

[0092] In the above technical solution, by providing a buffer layer between at least some of two adjacent pouch battery cells, and the hardness of the buffer layer being less than that of the outer shell, the buffer layer can absorb the expansion and deformation of the pouch battery cells, and the buffer layer can provide buffer for the deformation of adjacent pouch battery cells.

[0093] In some embodiments, the buffer layer is a foam layer or a silicone layer.

[0094] In the above technical solution, by setting a reinforcing separator between at least some of the two adjacent soft-pack battery cells to enhance the rigidity of the battery pack, and by setting the buffer layer as a foam layer or a silicone layer, the buffer layer has good flexibility and elastic deformation ability, so as to better absorb the expansion and deformation of the soft-pack battery cells. In addition, the foam layer or silicone layer is lighter, which helps to reduce the overall weight of the battery device.

[0095] In some embodiments, the buffer layer and the reinforcing partition are alternately arranged along the first direction.

[0096] In the above technical solution, by alternately setting the buffer layer and reinforcing separator between the soft-pack battery cells in the arrangement direction of the soft-pack battery cells, the multiple soft-pack battery cells can be reinforced more uniformly, and the expansion deformation of the multiple soft-pack battery cells along the thickness direction can be better buffered and absorbed.

[0097] In some embodiments, the electrode leads are located on opposite sides of the pouch cell along a second direction that intersects with the first direction. Along the second direction and in the direction close to the side wall of the housing, the end of the reinforcing partition protrudes from the housing of the pouch cell to form a fixed end, which is connected to the housing.

[0098] In the above technical solution, by making the end of the reinforcing separator protrude from the outer shell of the soft-pack battery cell and connect it to the box, since the reinforcing separator is sandwiched between multiple soft-pack battery cells and forms a battery pack with multiple soft-pack battery cells, the battery pack can be connected and fixed to the side wall of the box. Since the overall hardness of the reinforcing separator is greater than that of the outer shell of the soft-pack battery cell, the connection between the battery pack and the box can be more reliable, thereby improving the installation reliability and stability of the battery pack in the box.

[0099] In some embodiments, the fixed end and the electrode lead located on the same side in the second direction are arranged along a third direction, and the first direction, the second direction and the third direction intersect each other.

[0100] In the above technical solution, by arranging the fixed end of the reinforcing separator and the electrode lead located on the same side in the second direction along the third direction, the space inside the box can be fully utilized to arrange the fixed end of the reinforcing separator and the electrode lead along the third direction. This can better avoid the contact or interference between the fixed end of the reinforcing separator and the electrode lead located on the same side in the second direction due to their close proximity. This makes full use of the space inside the box, resulting in a more compact internal structure layout of the battery device, which is beneficial to improving the energy density of the battery device.

[0101] In some embodiments, the housing is provided with a mounting bracket, the mounting bracket is located on at least one side of the battery pack along a second direction and is connected to the housing, and the fixed end is connected to the mounting bracket.

[0102] In the above technical solution, by setting a mounting bracket inside the box and connecting the reinforcing separator of the battery pack to the box through the mounting bracket, the stability and reliability of the connection between the reinforcing separator and the box can be further improved, and the overall rigidity and strength of the battery device can be increased.

[0103] In some embodiments, the height dimension of the mounting bracket in the third direction is smaller than the width dimension of the pouch battery cell in the third direction, so as to form an arrangement space on one side of the mounting bracket along the third direction, wherein the first direction, the second direction, and the third direction intersect each other.

[0104] In the above technical solution, by making the height dimension of the mounting bracket in the third direction smaller than the width dimension of the soft-pack battery cell in the third direction, a layout space can be formed on one side of the mounting bracket along the third direction. This layout space can be used to arrange the wiring and other structures of the battery pack, thereby making the wiring structure layout of the battery pack simpler and making full use of the space in the third direction inside the box, making the internal structure layout of the battery device more compact, which is conducive to improving the energy density of the battery device.

[0105] In some embodiments, at least some of the pouch battery cells are arranged along the thickness direction of the pouch battery cells, the housing is provided with a baffle strip, the outer surface of the housing includes an adjacent bottom surface and a side surface, the bottom surface is located on the lower side of the housing, the side surface is located on both sides of the thickness direction of the pouch battery cells, a chamfer is formed at the connection between the bottom surface and the side surface, the housing includes a bottom plate, the bottom surface and the bottom plate are connected by an adhesive layer, the baffle strip is located on the outer periphery of the bottom surface and at least a portion of the baffle strip is located between the chamfer and the bottom plate.

[0106] In the above technical solution, by setting a baffle strip at the chamfered bottom of the soft-pack battery cell and placing the baffle strip between the chamfered bottom of the soft-pack battery cell and the bottom plate, when the bottom surface of the soft-pack battery cell is fixedly connected to the bottom plate of the box through the adhesive layer, the baffle strip can prevent the structural adhesive forming the adhesive layer from overflowing into the gap between adjacent soft-pack battery cells, reducing the probability of the gap between adjacent soft-pack battery cells forming a hard structure due to adhesive overflow. This can improve the problem of local stress concentration between adjacent soft-pack battery cells and reduce the risk of damage to the soft-pack battery cells.

[0107] In some embodiments, in the thickness direction of the pouch battery cell, two adjacent pouch battery cells share a single sealing strip.

[0108] In the above technical solution, by having two adjacent pouch cell cells share a single adhesive strip, the two pouch cell cells can use the shared adhesive strip to prevent the structural adhesive forming the adhesive layer from overflowing into the gap between the adjacent pouch cell cells. This reduces the number of adhesive strips required, thereby reducing the number of adhesive strips that need to be assembled and helping to reduce the assembly time of the battery device.

[0109] In some embodiments, the adhesive strip is adhesive-resistant foam, and the adhesive strip is bonded to the base plate; or, the adhesive strip is a strip with adhesive on one side, and the adhesive strip is bonded to the chamfered portion.

[0110] In the above technical solutions, by using adhesive-blocking foam as the adhesive-blocking strip, which has good compressibility, the adhesive-blocking foam can better separate the gap between the bottom surface of the soft-pack battery cell and the gap between two adjacent soft-pack battery cells by squeezing the adhesive-blocking strip. This better prevents the adhesive layer on the bottom surface of the soft-pack battery cell from overflowing into the gap between the two adjacent soft-pack battery cells. Furthermore, the adhesive-blocking strip is bonded to the base plate, facilitating its installation and fixation. Alternatively, by using an adhesive strip with single-sided backing, the adhesive-blocking strip is bonded to the chamfered part, making it easy to bond and fix the adhesive-blocking strip to the chamfered part of the soft-pack battery cell. This makes the adhesive-blocking strip and the soft-pack battery cell a whole, facilitating the subsequent fixation of the soft-pack battery cell to the base plate of the casing using the adhesive layer.

[0111] Thirdly, this application provides an electrical device, including: a battery device according to the second aspect of this application described above.

[0112] In the above technical solution, the power device includes the aforementioned battery device, which has a high energy density, thus improving the overall performance of the power device.

[0113] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0114] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0115] Figure 1 is a schematic diagram of a battery pack according to some embodiments of this application;

[0116] Figure 2 is a front view of the battery pack in Figure 1;

[0117] Figure 3 is an enlarged view of point A in Figure 2;

[0118] Figure 4 is a schematic diagram of a single pouch cell in a battery pack according to some embodiments of this application;

[0119] Figure 5 is a schematic diagram of a battery pack according to some embodiments of this application;

[0120] Figure 6 is an enlarged view of point B in Figure 5;

[0121] Figure 7 is a schematic diagram of a battery pack according to some embodiments of this application;

[0122] Figure 8 is an enlarged view of point C in Figure 7;

[0123] Figure 9 is a cross-sectional schematic diagram of a reinforcing separator in a battery pack according to some embodiments of the present application;

[0124] Figure 10 is a schematic diagram of a battery device according to some embodiments of this application;

[0125] Figure 11 is a front view of the battery device in Figure 10;

[0126] Figure 12 is a cross-sectional view along line DD in Figure 11;

[0127] Figure 13 is a schematic diagram of the internal structure of the battery device in Figure 10, with the top cover removed;

[0128] Figure 14 is a schematic diagram of the battery pack arrangement in a battery device according to some embodiments of the present application;

[0129] Figure 15 is an enlarged view of point E in Figure 14;

[0130] Figure 16 is a schematic diagram of the cooperation between the battery pack and the mounting bracket in a battery device according to some embodiments of this application;

[0131] Figure 17 is an enlarged view of point F in Figure 16;

[0132] Figure 18 is a schematic diagram of the fixing of multiple soft-pack battery cells to the bottom plate of the casing in a battery device according to some embodiments of the present application;

[0133] Figure 19 is a schematic diagram of an electrical device according to some embodiments of this application.

[0134] Reference numerals: 1000, Electrical device; 100, Battery assembly; 10, Housing; 11, Top cover; 12, Base plate; 13, Receiving cavity; 14, Constraint; 141, Fastener; 15, Mounting bracket; 151, Sub-mounting bracket; 16, Arrangement space; 20, Battery pack; 21, Sub-battery pack; 22, Connecting part; 221, Straight section; 222, Arc section; 30, Soft-pack battery cell; 31, Outer shell; 311, Bottom surface of the shell; 312, Side surface of the shell; 313, Chamfered part; 32, Electrode assembly; 33, Electrode lead; 331, Lead-out part; 332, Rounded corner; 333, Connecting section; 34, Clearance space; 35, Sealing strip; 36, Adhesive layer; 40, Reinforcing partition; 41, Fixed end; 42, Cavity; 43, Heat exchange channel; 50, Buffer layer; 200. Vehicle body. Detailed Implementation

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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 a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0139] 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.

[0140] 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.

[0141] In this application, "multiple" means two or more (including two).

[0142] In the embodiments of this application, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined with each other to form new technical solutions.

[0143] In the embodiments of this application, unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0144] In embodiments of this application, the battery apparatus may include one or more battery packs for providing voltage and capacity. The battery pack may include multiple pouch cell batteries. The battery apparatus may be a battery pack, which includes a housing and one or more battery packs housed within the housing.

[0145] In embodiments of this application, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing for housing the battery pack. Here, "closed" refers to covering or shutting down; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing for housing the battery pack.

[0146] In embodiments of this application, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0147] In this embodiment, the pouch battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The pouch battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to these types. The pouch battery cell can be flat, cuboid, or other shapes, and this embodiment is not limited to these shapes either. As the smallest energy unit of a battery device, the pouch battery cell includes a casing and electrode components disposed within the casing.

[0148] Electrode assemblies are the components within a single pouch cell where electrochemical reactions occur. One or more electrode assemblies may be contained within the casing. An electrode assembly is primarily formed by winding or stacking positive and negative electrode plates, typically with a separator between them. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions without active material each form a tab. The positive and negative tabs can be located at opposite ends of the main body.

[0149] The positive electrode sheet may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer including a positive electrode active material.

[0150] 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.

[0151] 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.).

[0152] As an example, 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 for improving the energy density of a single pouch cell. 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.

[0153] 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.

[0154] Layered transition metal oxides include those with the general formula Li a Ni b Co c MdO 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.

[0155] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, and lithium nickel cobalt manganese oxides (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM333) and LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), LiNi 0.9 Co 0.05 Mn 0.05 O2 (also known as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0156] 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.

[0157] In the examples of positive electrode active materials in this application, the molar content of oxygen is only a theoretical value. Oxygen release from the crystal lattice will cause the molar content of oxygen to change. In reality, the molar content of oxygen will fluctuate.

[0158] 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.

[0159] 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.

[0160] 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%.

[0161] 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%.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0166] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in pouch cell batteries. 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.

[0167] 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 a single pouch cell.

[0168] In some embodiments, the silicon content 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%. When the silicon content is within the above range, the energy density of the pouch cell can be improved.

[0169] 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.

[0170] 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%.

[0171] 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%.

[0172] 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%.

[0173] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] Porous base membranes may include one or more of polyethylene and polypropylene.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] In some embodiments, the electrolyte within the battery cell includes an electrolyte salt and a solvent. The types of electrolyte salt and solvent are not specifically limited and can be selected according to actual needs.

[0183] 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.

[0184] 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.

[0185] In related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. Based on the rigidity of their casing, batteries can be broadly classified into pouch batteries and hard-shell batteries. Pouch batteries have the advantages of higher mass / volume energy density and better safety, making their application increasingly widespread.

[0186] When assembling multiple pouch cell batteries into a pack, the cells need to be electrically connected to form the battery pack. The electrical connection method between adjacent pouch cell batteries in the pack also affects the energy density of the pack. In related technologies, the connection method between adjacent pouch cell batteries in the pack is not conducive to further improving the energy density of the pack. Therefore, how to design the connection method between adjacent pouch cell batteries in the pack to further improve the energy density of the pack is a technical problem that needs to be solved.

[0187] Based on this, this application proposes a battery pack including a plurality of pouch battery cells connected in sequence. Each pouch battery cell includes a casing, an electrode assembly, and electrode leads. The electrode assembly is disposed inside the casing, and the electrode leads are electrically connected to the electrode assembly, with at least a portion of the electrode leads exposed outside the casing. The electrode leads of two adjacent pouch battery cells are directly connected.

[0188] In the aforementioned battery pack, by directly connecting the electrode leads of two adjacent pouch cell cells, the electrical connection devices between the pouch cell cells can be eliminated or reduced, thereby reducing the number of components in the battery pack and saving space occupied by electrical connection devices. This is beneficial for improving the energy density of the battery pack, and the cost can also be reduced by eliminating or reducing the electrical connection devices between the pouch cell cells.

[0189] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. Besides vehicles, the battery device can also be used in, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0190] The electrical devices disclosed in this application can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device is installed inside the vehicle, and the battery device can be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, the battery device can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery device to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this application, the battery device can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0191] The battery pack 20, battery device 100, and power consumption device 1000 according to embodiments of this application are described below with reference to Figures 1-19.

[0192] Referring to Figures 1-3, in a first aspect, this application provides a battery pack 20, including: a plurality of pouch battery cells 30 connected in sequence. Each pouch battery cell 30 includes a housing 31, an electrode assembly 32, and an electrode lead 33. The electrode assembly 32 is disposed inside the housing 31, and the electrode lead 33 is electrically connected to the electrode assembly 32, with at least a portion of the electrode lead 33 exposed outside the housing 31. The electrode leads 33 of two adjacent pouch battery cells 30 are directly connected.

[0193] The outer casing 31 of the pouch battery cell 30 has good flexibility and can be formed into a pouch shape. The electrode assembly 32 is housed inside the outer casing 31, making the pouch battery cell 30 a pouch battery. For example, the outer casing 31 can be an aluminum-plastic film.

[0194] The electrode assembly 32 of the pouch cell 30 can be a wound electrode assembly or a stacked electrode assembly. The electrode assembly 32 includes electrode sheets and tabs. The electrode assembly 32 can be formed by winding the electrode sheets or by stacking the electrode sheets. The electrode leads 33 of the pouch cell 30 are connected to the tabs, and at least a portion of the electrode leads 33 is located outside the housing 31 to serve as the lead-out structure of the electrode assembly 32. The electrode leads 33 can be used to electrically connect the pouch cell 30 to other pouch cells 30 or other components.

[0195] The electrode leads 33 of two adjacent pouch cell 30 are directly connected. The part of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The direct connection of the electrode leads 33 of two adjacent pouch cell 30 is actually the direct connection of the lead-out portions 331 of the two electrode leads 33.

[0196] The term "direct connection" in "direct connection of electrode leads 33 of two adjacent pouch cell 30" means that there is no need to connect them through electrical connection devices. The electrode leads 33 of the two pouch cell 30 are directly connected to achieve electrical connection between the two adjacent pouch cell 30.

[0197] The electrical connection between two adjacent pouch cell 30 can be a series connection.

[0198] In the above technical solution, by directly connecting the electrode leads 33 of two adjacent pouch cell 30 in the battery pack 20, the electrical connection devices between the pouch cell 30 can be eliminated or reduced, the number of components in the battery pack 20 can be reduced, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the battery pack 20. Furthermore, by eliminating or reducing the electrical connection devices between the pouch cell 30, the cost can also be reduced.

[0199] In some embodiments, the electrode leads 33 of two adjacent pouch cell 30 are welded together.

[0200] For example, the electrode leads 33 of two adjacent pouch cell 30 can be connected by laser welding or ultrasonic welding.

[0201] In the above technical solution, the electrode leads 33 of two adjacent soft-pack battery cells 30 in the battery pack 20 are connected by welding, thereby realizing the direct connection of the terminals of two adjacent soft-pack battery cells 30 in the battery pack 20. This makes the connection method of the electrode leads 33 of two adjacent soft-pack battery cells 30 in the battery pack 20 simple and reliable.

[0202] In some embodiments, the electrode leads 33 of two adjacent pouch cell 30 are directly connected by conductive adhesive.

[0203] For example, conductive adhesive can be applied to one electrode lead 33 of one of the two adjacent pouch cell 30, and the electrode lead 33 of the other pouch cell 30 can be connected to the electrode lead 33 coated with conductive adhesive; or, conductive adhesive can be applied to both electrode leads 33 of the two adjacent pouch cell 30, and the two electrode leads 33 coated with conductive adhesive can be connected through the conductive adhesive.

[0204] In the above technical solution, by connecting the electrode leads 33 of two adjacent soft-pack battery cells 30 in the battery pack 20 with conductive adhesive, the terminals of two adjacent soft-pack battery cells 30 in the battery pack 20 are directly connected, making the connection method of the electrode leads 33 of two adjacent soft-pack battery cells 30 in the battery pack 20 simple and reliable.

[0205] In some embodiments, referring to Figures 2-4, the portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331, which is formed in a sheet shape.

[0206] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By setting the lead-out portion 331 as a sheet, the connection area between the two electrode leads 33 can be larger, thereby improving the stability and reliability of the connection between the two electrode leads 33.

[0207] In some embodiments, referring to FIG4, in the width direction of the pouch cell 30, the lead-out portion 331 has rounded corners 332 formed at both ends in the width direction of the pouch cell 30.

[0208] Among the length, width, and thickness directions of the pouch cell 30, the pouch cell 30 has the largest dimension in the length direction and the smallest dimension in the thickness direction. For example, the thickness direction of the pouch cell 30 can be referred to as direction e1 in the attached drawing, the length direction of the pouch cell 30 can be referred to as direction e2 in the attached drawing, and the width direction of the pouch cell 30 can be referred to as direction e3 in the attached drawing.

[0209] In the above technical solution, by making the two ends of the lead-out portion 331 rounded corners 332, the risk of the lead-out portion 331 scratching other structures or the human body can be reduced during the process of connecting the lead-out portions 331 of the two electrode leads 33.

[0210] In some embodiments, the portion of the electrode lead 33 exposed outside the housing 31 is called the lead-out portion 331, which is a flexible structure.

[0211] The flexible structure refers to a structure that is flexible or elastic and can deform.

[0212] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By setting the lead-out portion 331 as a flexible structure, the lead-out portion 331 can be deformed. This allows the lead-out portion 331 to be bent without bending or bent into a set shape as needed, making the connection of the lead-out portions 331 of the two electrode leads 33 more flexible, and also making the arrangement of multiple soft-pack battery cells 30 in the battery pack 20 more flexible.

[0213] In some embodiments, referring to Figures 4-6, the portion of the electrode lead 33 exposed outside the housing 31 is the lead-out portion 331, and the thickness of the lead-out portion 331 is 0.1 mm to 0.5 mm.

[0214] For example, referring to Figure 6, the thickness of the lead-out portion 331 is d1, and the range of d1 is 0.1mm to 0.5mm. For example, d1 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0215] The thickness direction of the lead-out portion 331 can be consistent with the thickness direction of the soft-pack battery cell 30.

[0216] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By setting the thickness of the lead-out portion 331 to 0.1mm to 0.5mm, the thickness of the lead-out portion 331 can better meet the requirements of excessive current, and the structural strength of the lead-out portion 331 can also meet the requirements. In addition, the lead-out portion 331 can also have good flexibility, so as to reduce the difficulty of bending and deforming the lead-out portion when it needs to be bent and deformed.

[0217] In some embodiments, referring to Figures 2-4, the portion of the electrode lead 33 exposed outside the housing 31 is called the lead-out portion 331, and the width dimension of the lead-out portion 331 in the width direction of the soft-pack battery cell 30 is 20mm to 60mm.

[0218] For example, referring to FIG4, the width dimension of the lead-out portion 331 in the width direction of the soft-pack battery cell 30 is W1, and the range of W1 is 20mm to 60mm. For example, W1 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, etc.

[0219] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent pouch cell 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By setting the width of the lead-out portion 331 in the width direction of the pouch cell 30 to 20mm to 60mm, the width of the lead-out portion 331 can better meet the requirements of excessive current, and the connection area of ​​the two electrode leads 33 can be larger, thereby improving the stability and reliability of the connection between the two electrode leads 33.

[0220] In some embodiments, referring to Figures 2-4, the portion of the electrode lead 33 exposed outside the housing 31 is the lead-out portion 331, and the length of the lead-out portion 331 in the length direction of the soft-pack battery cell 30 is 10mm to 50mm.

[0221] For example, referring to FIG4, the length dimension of the lead-out portion 331 in the length direction of the soft-pack battery cell 30 is L1, and the range of L1 is 10mm to 50mm. For example, L1 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.

[0222] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent pouch cell 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By setting the length of the lead-out portion 331 in the length direction of the pouch cell 30 to 10mm to 50mm, the width of the lead-out portion 331 can better meet the requirements of excessive current, and the connection area of ​​the two electrode leads 33 can be larger, thereby improving the stability and reliability of the connection between the two electrode leads 33.

[0223] In some embodiments, the portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331, which is an aluminum foil or a copper foil.

[0224] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By using aluminum foil or copper foil as the material of the lead-out portion 331, the lead-out portion 331 can have good conductivity. In addition, the lead-out portion 331 can also have good ductility and flexibility, so as to reduce the difficulty of bending and deforming the lead-out portion when it needs to be bent and deformed.

[0225] In some embodiments, referring to Figures 3-6, the portion of the electrode lead 33 exposed outside the housing 31 is the lead-out portion 331. The lead-out portion 331 includes a connecting segment 333, in which the connecting segments 333 of the two directly connected electrode leads 33 are stacked and connected. The ratio of the length dimension of the connecting segment 333 in the length direction of the pouch cell 30 to the length dimension of the lead-out portion 331 in the length direction of the pouch cell 30 is 1 / 4 to 1 / 2.

[0226] The overlapping of the connection segments 333 of the two directly connected electrode leads 33 means that the connection segments 333 of the two directly connected electrode leads 33 are overlapped in the thickness direction of the lead-out portion 331 and connected at the overlapping position, for example, by welding at the overlapping position.

[0227] The length dimension of the connecting segment 333 in the length direction of the pouch battery cell 30 is defined in the following cases: Case 1: When the extension direction of the connecting segment 333 is consistent with the length direction of the pouch battery cell 30, the length dimension of the connecting segment 333 in the length direction of the pouch battery cell 30 is measured; Case 2: When the lead-out portion 331 is in a bent state and the extension direction of the connecting segment 333 is inconsistent with the length direction of the pouch battery cell 30, the lead-out portion 331 is restored to an unbent state, and the length dimension of the connecting segment 333 in the length direction of the pouch battery cell 30 is measured.

[0228] For example, referring to Figures 3-6, the length of the connecting segment 333 in the length direction of the pouch cell 30 is L2, and the length of the lead-out portion 331 in the length direction of the pouch cell 30 is L1. The ratio of L2 to L1 is 1 / 4 to 1 / 2. For example, the ratio of L2 to L1 is 1 / 4, 3 / 8, 2 / 5, 1 / 2, etc.

[0229] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent pouch cell 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By making the ratio of the length of the overlapping portion of the two lead-out portions 331 in the length direction of the pouch cell 30 to the length of the lead-out portion 331 in the length direction of the pouch cell 30 1 / 4 to 1 / 2, the overlapping connection length of the two electrode leads 33 can be larger, improving the stability and reliability of the connection between the two electrode leads 33. In addition, a portion of the lead-out portion 331 can be left so that the overlapping connection portion 22 of the two electrode leads 33 is spaced apart from the housing 31, which facilitates the direct connection operation of the two electrode leads 33.

[0230] In some embodiments, referring to Figures 2-4, the two electrode leads 33 of the pouch cell 30 are located on opposite sides of the pouch cell 30 along its length.

[0231] One of the two electrode leads 33 of the pouch cell 30 is the positive electrode lead 33, and the other of the two electrode leads 33 of the pouch cell 30 is the negative electrode lead 33. One of the two electrode leads 33 of the pouch cell 30 is located on one side of the pouch cell 30 along its length, and the other of the two electrode leads 33 of the pouch cell 30 is located on the other side of the pouch cell 30 along its length.

[0232] When the two electrode leads 33 of the pouch cell 30 are located on opposite sides of the length of the pouch cell 30, two adjacent pouch cells 30 can be connected in series, and multiple pouch cells 30 in the battery pack 20 can also be connected in series sequentially.

[0233] In the above technical solution, by positioning the two electrode leads 33 of the pouch battery cell 30 on opposite sides along the length of the pouch battery cell 30, multiple pouch battery cells 30 can be connected in a long string when they are connected sequentially. The number of pouch battery cells 30 in the battery pack 20 is less restricted, allowing for both battery packs 20 with a small number of pouch battery cells 30 and battery packs 20 with a large number of pouch battery cells 30. This makes the number of pouch battery cells 30 in the battery pack 20 more flexible.

[0234] In some embodiments, referring to Figures 2-4, the portion of the electrode lead 33 exposed outside the housing 31 is the lead-out portion 331, and the middle position in the width direction of the pouch cell 30 is the width middle position. In the width direction of the pouch cell 30, the lead-out portion 331 is located on one side of the width middle position, so as to form a clearance space 34 on the side of the lead-out portion 331 near the width middle position.

[0235] For example, the midpoint of the width direction of the pouch battery cell 30 can be referenced to the midpoint s of the width of the pouch battery cell 30 in Figure 4. For example, when the battery pack 20 is installed inside the housing 10, if the pouch battery cell 30 is arranged vertically along its width direction, the lead-out portion 331 of the pouch battery cell 30 can be located at the lower or upper end of the pouch battery cell 30, thereby forming the aforementioned clearance space 34 on the upper or lower side of the lead-out portion 331.

[0236] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent pouch cell 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By setting the lead-out portion 331 on one side of the middle position in the width direction of the pouch cell 30, a clearance space 34 can be formed on the side of the lead-out portion 331 near the middle position of the width. This clearance space 34 can make room for the arrangement of other structures, improve the compactness of the overall structure of the battery pack 20, and thus help to improve the energy density of the battery pack 20.

[0237] In some embodiments, a plurality of pouch cell 30s of the battery pack 20 are connected in series.

[0238] In the above technical solution, by connecting multiple soft-pack battery cells 30 in series in the battery pack 20, the output voltage of the battery pack 20 can be made higher.

[0239] In some embodiments, the battery pack 20 includes a thermal management component disposed on at least one side of the pouch cell 30 in the thickness direction. The thermal management component is thermally connected to the pouch cell 30 for heat exchange with the pouch cell 30.

[0240] The thermal management component is disposed on at least one side of the pouch cell 30 in the thickness direction. For example, the thermal management component can be disposed on one side of the pouch cell 30 in the thickness direction, or it can be disposed on both sides of the pouch cell 30 in the thickness direction. The thermal management component and the pouch cell 30 can be connected by thermally conductive adhesive, thereby achieving a thermally conductive connection between the thermal management component and the pouch cell 30.

[0241] The thermal management component can increase or decrease the temperature of the pouch cell 30. For example, a heat exchange channel 43 can be formed within the thermal management component. The heat exchange channel 43 is used for the flow of a heat exchange medium, which can transfer heat to the pouch cell 30 or absorb the heat generated by the pouch cell 30, thereby regulating the temperature of the pouch cell 30.

[0242] In the above technical solution, by setting a thermal management component and placing the thermal management component on at least one side of the thickness direction of the pouch battery cell 30, the temperature of the pouch battery cell 30 can be regulated by exchanging heat between the thermal management component and the pouch battery cell 30, thereby adjusting the temperature of the pouch battery cell 30 to a suitable range.

[0243] In some embodiments, referring to Figures 1 and 2, all the pouch cell 30 in the battery pack 20 are arranged along the length of the pouch cell 30.

[0244] For example, the two electrode leads 33 of the pouch cell 30 are located on both sides of the length direction of the pouch cell 30. The positive electrode lead 33 of one of the two adjacent pouch cells 30 in the battery pack 20 is directly connected to the negative electrode lead 33 of the other two pouch cells 30 in the battery pack 20, so that all the pouch cells 30 in the battery pack 20 can be arranged along the length direction of the pouch cell 30.

[0245] In the above technical solution, by arranging all the soft-pack battery cells 30 of the battery pack 20 along the length of the soft-pack battery cells 30, the arrangement of the multiple soft-pack battery cells 30 of the battery pack 20 can be simplified, and the process of assembling multiple soft-pack battery cells 30 to form the battery pack 20 can be simplified.

[0246] In some embodiments, referring to Figures 5-8, all the pouch cell 30 in the battery pack 20 are divided into multiple sub-battery packs 21. The multiple sub-battery packs 21 are arranged along the thickness direction of the pouch cell 30. Each sub-battery pack 21 includes one pouch cell 30 or includes multiple pouch cell 30 arranged along the length direction of the pouch cell 30.

[0247] In the above technical solution, by dividing the multiple soft-pack battery cells 30 of the battery pack 20 into sub-battery packs 21 arranged along the thickness direction of the soft-pack battery cells 30, the overall structure of the battery pack 20 can be made compact, and the arrangement of the multiple soft-pack battery cells 30 in the battery pack 20 can be set as needed, which also makes the arrangement of the multiple soft-pack battery cells 30 in the battery pack 20 more flexible.

[0248] In some embodiments, referring to Figures 5-8, the portion of the electrode lead 33 exposed outside the housing 31 is the lead-out portion 331. The lead-out portions 331 of two electrode leads 33 directly connected in two adjacent sub-battery packs 21 are connected and together form a connection portion 22. At least a portion of the connection portion 22 is curved.

[0249] At least a portion of the connecting portion 22 is curved, meaning that the connecting portion 22 extends in a non-linear manner. For example, before bending or folding the connecting portion 22, the connecting portion 22 can extend in a straight line, for example, the connecting portion 22 can extend in a straight line along the length of the soft-pack battery cell 30. After bending or folding the connecting portion 22, the connecting portion 22 extends in a non-linear manner. For example, the connecting portion 22 can be U-shaped or C-shaped.

[0250] In the above technical solution, the portion of the electrode lead 33 exposed outside the housing 31 is defined as the lead-out portion 331. The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which is actually the lead-out portions 331 of the two electrode leads 33 are directly connected. By forming a connecting portion 22 together with the lead-out portions 331 of the two electrode leads 33 directly connected in two adjacent battery packs 20, and setting the connecting portion 22 to be curved, it is possible to conveniently arrange multiple sub-battery packs 21 in the battery pack 20 along the thickness direction of the soft-pack battery cell 30.

[0251] In some embodiments, referring to Figures 5-8, in the connection direction of two directly connected electrode leads 33, the connection portion 22 includes a plurality of straight segments 221 connected in sequence. Two adjacent straight segments 221 are arranged at an angle and are connected by an arc segment 222. The arc segment 222 extends along an arc, and the straight segment 221 extends along a straight line.

[0252] The angle between two adjacent straight segments 221 means that the angle between two adjacent straight segments 221 is greater than 0 and less than 180°. For example, referring to Figure 6, the angle between two adjacent straight segments 221 is α, and the range of α can be 80° to 100°, for example, α can be 90°.

[0253] For example, referring to FIG6, the connecting portion 22 includes three straight segments 221 connected in sequence, an arc segment 222 connecting two adjacent straight segments 221, the straight segment 221 located between two arc segments 222 can extend along the thickness direction of the soft-pack battery cell 30, and the other two straight segments 221 can extend along the length direction of the soft-pack battery cell 30.

[0254] In the above technical solution, by setting the connecting part 22, which is composed of two directly connected lead-out parts 331, to be curved, the adjacent straight segments 221 of the connecting part 22 are connected by arc segments 222. This can reduce the occurrence of sharp corners or edges in the connecting part 22 and reduce stress concentration at sharp corners or edges.

[0255] In some embodiments, referring to Figures 5-8, the connection position of the two directly connected electrode leads 33 is located in the straight section 221.

[0256] For example, referring to FIG6, the lead-out portion 331 of the electrode lead 33 includes a connecting segment 333. The connecting segments 333 of the two directly connected electrode leads 33 are stacked and connected in the thickness direction of the lead-out portion 331. The connection position of the two directly connected electrode leads 33 is the position where the connecting segments 333 of the two directly connected electrode leads 33 are stacked and connected.

[0257] For example, referring to FIG6, the connecting part 22 includes three straight segments 221 connected in sequence, an arc segment 222 connecting two adjacent straight segments 221, the straight segment 221 located between two arc segments 222 can extend along the thickness direction of the soft-pack battery cell 30, the other two straight segments 221 can extend along the length direction of the soft-pack battery cell 30, and the connection position of the two directly connected electrode leads 33 can be located in the straight segment 221 extending along the length direction of the soft-pack battery cell 30.

[0258] In the above technical solution, by making the connection position of the two directly connected electrode leads 33 located on the straight segment of the connection part 22 instead of the arc segment 222, the connection position of the two directly connected electrode leads 33 can be located at a position with less stress, thereby reducing the impact of stress on the connection of the electrode leads 33 and improving the reliability and stability of the connection of the two directly connected electrode leads 33.

[0259] In some embodiments, referring to Figures 7-9, the battery pack 20 includes a reinforcing separator 40, which is sandwiched between two adjacent pouch cell 30. The hardness of the reinforcing separator 40 is greater than that of the outer casing 31.

[0260] For example, the reinforcing partition 40 can be a metal plate, and the outer shell 31 can be an aluminum-plastic film.

[0261] The reinforcing separator 40 is sandwiched between two adjacent pouch cell 30, including the following situations: a reinforcing separator 40 is provided between some adjacent pouch cell 30, and no reinforcing separator 40 is provided between other adjacent pouch cell 30; or, a reinforcing separator 40 is provided between every two adjacent pouch cell 30.

[0262] The reinforcing separator 40 can be bonded and fixed to the outer casing 31 of the soft-pack battery cell 30.

[0263] In the above technical solution, by setting a reinforcing separator 40 between adjacent soft-pack battery cells 30 and making the hardness of the reinforcing separator 40 greater than that of the outer shell 31, it is convenient to group multiple soft-pack battery cells 30 together. This can improve the overall rigidity of the battery pack 20 formed by grouping multiple soft-pack battery cells 30 together, thereby facilitating the installation of the battery pack 20 formed by grouping multiple soft-pack battery cells 30 together and reducing the deformation of the soft-pack battery cells 30 after grouping.

[0264] In some embodiments, referring to FIG9, the thickness of the reinforcing partition 40 is 0.8 mm to 2.0 mm.

[0265] The thickness direction of the reinforcing separator 40 is consistent with the thickness direction of the soft-pack battery cell 30.

[0266] For example, the thickness of the reinforcing partition 40 is d2, and the range of d2 is 0.8mm to 2.0mm; for example, d2 is 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, etc.

[0267] In the above technical solution, by setting the thickness of the reinforcing separator 40 to not less than 0.8mm, the battery pack 20 formed by the multiple soft-pack battery cells 30 of the reinforcing separator 40 can have an effective reinforcing effect. At the same time, by setting the thickness of the reinforcing separator 40 to not more than 2.0mm, the reinforcing separator 40 can effectively strengthen the battery pack while reducing the space occupied by the reinforcing separator 40, so that the battery pack 20 has a higher energy density. By setting the thickness of the reinforcing separator 40 to 0.8mm to 2.0mm, the overall strength and rigidity of the battery pack 20 can be effectively improved, while the overall energy density of the battery pack 20 can be higher.

[0268] In some embodiments, the reinforcing partition 40 is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0269] In the above technical solution, by setting the reinforcing separator 40 to a material such as aluminum plate, aluminum alloy plate, copper plate or steel plate, the reinforcing separator 40 can have higher strength and hardness, thereby better improving the overall rigidity of the multiple soft-pack battery cells 30 and better reducing the deformation of the assembled soft-pack battery cells 30.

[0270] In some embodiments, the reinforcing partition 40 is a solid structure.

[0271] In the above technical solution, by setting the reinforcing separator 40 as a solid structure, the reinforcing separator 40 can have good structural strength and rigidity, and can play an effective strengthening role when the thickness of the reinforcing separator 40 is small. This is beneficial to the battery pack 20 as a whole having good strength and rigidity, while also having a high volumetric energy density.

[0272] In some embodiments, referring to FIG9, a cavity 42 is formed within the reinforcing partition 40.

[0273] For example, referring to FIG9, the cavity 42 formed in the reinforcing separator 40 can be a plurality of spaced cavities. The plurality of cavities 42 in the reinforcing separator 40 can be arranged at intervals along the width direction of the soft-pack battery cell 30, and each cavity 42 can extend along the length direction of the soft-pack battery cell 30.

[0274] In the above technical solution, by setting a cavity 42 in the reinforcing separator 40, the reinforcing separator 40 can enhance the overall rigidity of the soft-pack battery cells 30 after assembly, while the cavity 42 in the reinforcing separator 40 can absorb the expansion and deformation of the soft-pack battery cells 30. The cavity 42 in the reinforcing separator 40 can provide a buffer for the deformation of the adjacent soft-pack battery cells 30, and is also conducive to reducing the weight of the reinforcing separator 40.

[0275] In some embodiments, referring to FIG9, the cavity 42 includes a heat exchange channel 43 for the flow of the heat exchange medium.

[0276] When at least a portion of the cavity 42 of the reinforcing baffle 40 is used as a heat exchange channel 43, the reinforcing baffle 40 can serve as at least a portion of a thermal management component.

[0277] For example, the reinforcing separator 40 can be connected to the pouch cell 30 through thermally conductive adhesive, thereby facilitating heat exchange between the reinforcing separator 40 and the pouch cell 30. During the flow of the heat exchange medium through the heat exchange channel 43, the temperature of the pouch cell 30 can be regulated, for example, the temperature of the pouch cell 30 can be increased or decreased.

[0278] In the above technical solution, at least a portion of the cavity 42 in the reinforcing separator 40 constitutes a heat exchange channel 43. By having the heat exchange medium flow through the heat exchange channel 43 in the reinforcing separator 40, the heat exchange medium can exchange heat with the soft-pack battery cell 30, thereby achieving effective regulation of the temperature of the soft-pack battery cell 30.

[0279] In some embodiments, the pouch cell 30 is any one of a lithium iron phosphate cell, a ternary lithium cell, and a solid-state cell.

[0280] For example, the soft-pack battery cell 30 can be a lithium iron phosphate battery cell; another example is that the soft-pack battery cell 30 can be a ternary lithium battery cell; yet another example is that the soft-pack battery cell 30 can be a solid-state battery cell.

[0281] In the above technical solutions, in embodiments where the pouch battery cell 30 is a lithium iron phosphate battery cell, the safety of the pouch battery cell 30 can be improved and the cycle life of the pouch battery cell 30 can be extended; in embodiments where the pouch battery cell 30 is a ternary lithium battery cell, the energy density of the pouch battery cell 30 can be improved and the driving range can be increased; in embodiments where the pouch battery cell 30 is a solid-state battery cell, not only the energy density can be improved, but also the safety can be improved.

[0282] In some embodiments, when the pouch cell 30 is a lithium iron phosphate battery cell, the ratio of positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material of the pouch cell 30 is 96:1-3:1-3; when the pouch cell 30 is a ternary lithium battery cell, the ratio of positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material of the pouch cell 30 is 96:2-3:1-2.

[0283] The ratio of positive electrode active material, positive electrode binder, and positive electrode conductive agent refers to their mass ratio.

[0284] The dosage ratio is 96:1-3:1-3, including the following situations: dosage ratios of 96:1:1, 96:1:2, 96:1:3, 96:2:1, 96:2:3, 96:3:1, 96:3:2, 96:3:3, etc.

[0285] The dosage ratio is 96:2-3:1-2, including the following situations: dosage ratios of 96:2:1, 96:2:2, 96:3:1, 96:3:2, etc.

[0286] In the above technical solutions, in embodiments where the pouch battery cell 30 is a lithium iron phosphate battery cell, the positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material are formulated in the above ratio, which can improve the electrochemical performance and mechanical stability of the pouch battery cell 30; in embodiments where the pouch battery cell 30 is a ternary lithium battery cell, the positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material are formulated in the above ratio, which can improve the energy density and cycle life of the pouch battery cell 30.

[0287] Secondly, referring to Figures 10-13, this application provides a battery device 100, including: a housing 10 and a battery pack 20, wherein the battery pack 20 is disposed inside the housing 10, and the battery pack 20 is the battery pack 20 of the first aspect of this application.

[0288] For example, referring to FIG10, the housing 10 may include a bottom plate 12 and a top cover 11. The top cover 11 covers the upper end of the bottom plate 12 and together with the bottom plate 12 defines a space for accommodating the battery pack 20. The housing 10 can protect the battery pack 20.

[0289] In the above technical solution, the battery device 100 includes the battery pack 20, which can eliminate or reduce the electrical connection devices between the pouch battery cells 30, reduce the number of components in the battery pack 20, thereby saving the space occupied by the electrical connection devices, which is conducive to improving the energy density of the battery pack 20, thereby improving the density of the battery device 100, and also reduces the cost by eliminating or reducing the electrical connection devices between the pouch battery cells 30.

[0290] In some embodiments, referring to Figures 13-16, there are multiple battery packs 20.

[0291] Multiple battery packs 20 can be arranged in the same direction or in different directions within the housing 10.

[0292] In the above technical solution, by including the above-mentioned multiple battery packs 20 in the battery device 100, the battery device 100 can have a large capacity and the overall energy density of the battery device 100 can be high.

[0293] In some embodiments, referring to Figures 13-16, at least a portion of the battery pack 20 is arranged along a first direction, and the thickness direction of the pouch battery cells 30 is all set along the first direction.

[0294] At least some of the battery packs 20 are arranged along the first direction. For example, some of the battery packs 20 may be arranged along the first direction, or all of the battery packs 20 may be arranged along the first direction.

[0295] In the above technical solution, by arranging at least a portion of the multiple battery packs 20 along the thickness direction of the soft-pack battery cell 30, the arrangement of the multiple battery packs 20 within the battery device 100 can be made more compact, which is beneficial to improving the energy density of the battery device 100.

[0296] In some embodiments, multiple battery packs 20 are connected in series and / or in parallel.

[0297] Multiple battery packs 20 are connected in series and / or in parallel, for example, multiple battery packs 20 are connected in series, multiple battery packs 20 are connected in parallel, or multiple battery packs 20 are partially connected in series and partially connected in parallel, so that multiple battery packs 20 form a series-parallel hybrid connection.

[0298] In the above technical solutions, by connecting multiple battery packs 20 in series, the battery device 100 can have a higher output voltage; or, by connecting multiple battery packs 20 in parallel, the battery device 100 can have a higher output current; by arranging multiple battery packs 20 in a mixed series and parallel configuration, the battery device 100 can have both a higher output voltage and a higher output current.

[0299] In some embodiments, referring to Figures 10-13, the thickness direction of each soft-pack battery cell 30 is arranged along the first direction, the length direction of each soft-pack battery cell 30 is arranged along the second direction, and the width direction of each soft-pack battery cell 30 is arranged along the third direction. The first direction, the second direction, and the third direction intersect each other. The bottom plate 12 and the top cover 11 of the housing 10 are located on opposite sides of the battery pack 20 along the second direction.

[0300] For example, the first direction can refer to direction e1 in the attached drawing, the second direction can refer to direction e2 in the attached drawing, and the third direction can refer to direction e3 in the attached drawing. The first direction, the second direction, and the third direction can be set perpendicular to each other.

[0301] For example, when the third direction is up and down, the bottom plate 12 is located on the lower side of the battery pack 20, and the top cover 11 is located on the upper side of the battery pack 20.

[0302] In the above technical solution, by setting the thickness direction of the multiple soft-pack battery cells 30 along the first direction, setting the length direction of the multiple soft-pack battery cells 30 along the second direction, and setting the width direction of the multiple soft-pack battery cells 30 along the third direction, and by setting the bottom plate 12 and top cover 11 of the housing 10 on both sides of the battery pack 20 in the second direction, the multiple soft-pack battery cells 30 in the battery device 100 can be arranged more compactly and the arrangement method is simple, which makes it convenient to assemble the multiple soft-pack battery cells 30 into the housing 10 after grouping them together.

[0303] In some embodiments, referring to Figures 12 and 13, the housing 10 has a receiving cavity 13 for accommodating the battery pack 20, and the housing 10 is provided with a constraint member 14 extending along a first direction. The two ends of the constraint member 14 in the length direction are respectively connected to the two side walls of the receiving cavity 13 along the first direction.

[0304] The two ends of the constraint member 14 in the length direction are respectively connected to the two side walls of the receiving cavity 13 along the first direction, which means that one end of the constraint member 14 in the length direction is connected to one side wall of the receiving cavity 13 along the first direction, and the other end of the constraint member 14 in the length direction is connected to the other side wall of the receiving cavity 13 along the first direction.

[0305] For example, the housing 10 can have one cavity 13, or it can have multiple cavities 13 spaced apart. For instance, in the example of Figure 13, a reinforcing beam is provided inside the housing 10. This reinforcing beam can be mounted on the bottom plate 12 of the housing 10, improving the structural strength and rigidity of the bottom plate 12. The reinforcing beam can extend along a second direction, dividing the space inside the housing 10 into two cavities 13 arranged along a first direction.

[0306] When the housing 10 has a receiving cavity 13, the two ends of the constraint member 14 in the length direction are respectively connected to the two side walls of the housing 10 along the first direction; when the housing 10 is provided with the above-mentioned reinforcing beam, one end of the constraint member 14 in the length direction is connected to the side wall of the housing 10, and the other end of the constraint member 14 in the length direction is connected to the reinforcing beam.

[0307] For example, in the example of Figure 13, at least a portion of the battery pack 20 is arranged along the first direction, the thickness direction of the pouch cell 30 is set along the first direction, and the two ends of the constraint member 14 in the length direction are respectively connected to the two side walls of the receiving cavity 13 along the first direction. By tightening the two side walls of the receiving cavity 13 along the first direction by the constraint member 14, the constraint member 14 can constrain and suppress the expansion deformation of the pouch cell 30 in its thickness direction.

[0308] In the above technical solution, by providing a constraint member 14 extending along the thickness direction of the soft-pack battery cell 30 inside the housing 10, and connecting and fixing the two ends of the constraint member 14 in the length direction to the housing 10 respectively, the constraint member 14 tightens the two side walls of the receiving cavity 13 along the first direction, so that the constraint member 14 can constrain and suppress the expansion deformation of the soft-pack battery cell 30 in its thickness direction.

[0309] In some embodiments, referring to FIG13, the two ends of the constraint member 14 are connected and fixed to the housing 10 by fasteners 141.

[0310] For example, fastener 141 can be a combination of bolt and nut.

[0311] In the above technical solution, by fastening the two ends of the constraint member 14 to the housing 10 through the two ends of the fastener 141, the two ends of the constraint member 14 can be more stably locked to the housing 10, so that the constraint member 14 can better play the role of constraining and suppressing the expansion and deformation of the soft-pack battery cell 30 in its thickness direction.

[0312] In some embodiments, the constraint member 14 includes a constraint band and an insulating layer, wherein the constraint band is a metal component and the insulating layer covers the outer surface of the constraint band.

[0313] The insulation layer can be a plastic insulation layer.

[0314] In the above technical solution, by setting the constraint member 14 to include a constraint band and an insulating layer, and making the constraint band a metal part, the constraint member 14 can have better structural strength, thereby enabling the constraint member 14 to better constrain and suppress the expansion and deformation of the soft-pack battery cell 30 in its thickness direction; and by making the outside of the constraint member 14 a covered insulating layer, while making the constraint member 14 a metal constraint band to better constrain and suppress the expansion and deformation of the soft-pack battery cell 30 in its thickness direction, it is possible to avoid problems such as short circuits between the constraint member 14 and the soft-pack battery cell 30 and other components due to electrical contact.

[0315] In some embodiments, referring to Figures 14 and 15, in a first direction, a reinforcing separator 40 is sandwiched between at least two adjacent pouch cell 30s. The reinforcing separator 40 is connected to the outer casing 31, and the hardness of the reinforcing separator 40 is greater than that of the outer casing 31.

[0316] For example, the reinforcing partition 40 can be a metal plate, and the outer shell 31 can be an aluminum-plastic film.

[0317] A reinforcing separator 40 is provided between at least some of two adjacent pouch cell 30, including the following situations: a reinforcing separator 40 is provided between some of the adjacent pouch cell 30, while no reinforcing separator 40 is provided between other adjacent pouch cell 30; or, a reinforcing separator 40 is provided between every two adjacent pouch cell 30.

[0318] The reinforcing separator 40 can be bonded and fixed to the outer casing 31 of the soft-pack battery cell 30.

[0319] In the above technical solution, by setting a reinforcing separator 40 between at least some of the adjacent two soft-pack battery cells 30 and making the hardness of the reinforcing separator 40 greater than that of the outer shell 31, it is convenient to group multiple soft-pack battery cells 30 together, which can improve the overall rigidity of the group of multiple soft-pack battery cells 30, thereby facilitating the installation of the group of multiple soft-pack battery cells 30 and reducing the deformation of the grouped soft-pack battery cells 30.

[0320] In some embodiments, referring to Figures 5-9, the thickness of the reinforcing separator 40 is less than the thickness of the pouch cell 30.

[0321] The thickness direction of the reinforcing separator 40 is consistent with the thickness direction of the soft-pack battery cell 30.

[0322] For example, the thickness of the reinforcing separator 40 is d2, and the thickness of the soft-pack battery cell 30 is d3, where d2 is less than d3. For example, the range of d2 is 0.8mm to 2.0mm; for example, d2 is 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, etc.

[0323] In the above technical solution, by making the thickness of the reinforcing separator 40 less than the thickness of the soft-pack battery cell 30, the overall rigidity of the multiple soft-pack battery cells 30 can be improved, while the space occupied by the reinforcing separator 40 can be reduced. In particular, the space occupied by the reinforcing separator 40 in the thickness direction of the soft-pack battery cell 30 can be reduced, resulting in a higher overall energy density of the battery device 100.

[0324] In some embodiments, the reinforcing partition 40 is a metal plate.

[0325] For example, the reinforcing partition 40 can be made of aluminum plate, aluminum alloy plate, copper plate or steel plate.

[0326] In the above technical solution, by setting the reinforcing separator 40 as a metal plate, the reinforcing separator 40 can have higher strength and hardness, thereby better improving the overall rigidity of the multiple soft-pack battery cells 30 grouped together and better reducing the deformation of the grouped soft-pack battery cells 30.

[0327] In some embodiments, the reinforcing partition 40 is a thermally conductive element and is thermally connected to the housing 31.

[0328] For example, the reinforcing separator 40 and the outer casing 31 can be thermally connected using thermally conductive adhesive. Since the reinforcing separator 40 is a thermally conductive component, it can transfer heat to the pouch cell 30 or absorb the heat generated by the pouch cell 30, thereby regulating the temperature of the pouch cell 30.

[0329] In the above technical solution, by setting the reinforcing separator 40 as a heat-conducting component and thermally connecting it with the outer shell 31, the reinforcing separator 40 can enhance the overall rigidity of the soft-pack battery cells 30 after assembly, and at the same time, it can also have a thermal management function. By exchanging heat between the reinforcing separator 40 and the soft-pack battery cells 30, the temperature of the soft-pack battery cells 30 can be adjusted, so that the soft-pack battery cells 30 can operate within a suitable temperature range.

[0330] In some embodiments, the reinforcing partition 40 is a solid structure.

[0331] In the above technical solution, by setting the reinforcing separator 40 as a solid structure, the reinforcing separator 40 can have good structural strength and rigidity, and can play an effective strengthening role when the thickness of the reinforcing separator 40 is small. This is beneficial to the battery pack 20 as a whole having good strength and rigidity, while also having a high volumetric energy density.

[0332] In some embodiments, referring to FIG9, a cavity 42 is formed within the reinforcing partition 40.

[0333] For example, referring to FIG9, the cavity 42 formed in the reinforcing separator 40 can be a plurality of spaced cavities. The plurality of cavities 42 in the reinforcing separator 40 can be arranged at intervals along the width direction of the soft-pack battery cell 30, and each cavity 42 can extend along the length direction of the soft-pack battery cell 30.

[0334] In the above technical solution, by setting a cavity 42 in the reinforcing separator 40, the reinforcing separator 40 can enhance the overall rigidity of the soft-pack battery cells 30 after assembly, while the cavity 42 in the reinforcing separator 40 can absorb the expansion and deformation of the soft-pack battery cells 30. The cavity 42 in the reinforcing separator 40 can provide a buffer for the deformation of the adjacent soft-pack battery cells 30, and is also conducive to reducing the weight of the reinforcing separator 40.

[0335] In some embodiments, referring to FIG9, the cavity 42 includes a heat exchange channel 43 for the flow of the heat exchange medium.

[0336] In the above technical solution, at least a portion of the cavity 42 in the reinforcing separator 40 constitutes a heat exchange channel 43. By having the heat exchange medium flow through the heat exchange channel 43 in the reinforcing separator 40, the heat exchange medium can exchange heat with the soft-pack battery cell 30, thereby achieving effective regulation of the temperature of the soft-pack battery cell 30.

[0337] When at least a portion of the cavity 42 of the reinforcing baffle 40 is used as a heat exchange channel 43, the reinforcing baffle 40 can serve as at least a portion of a thermal management component.

[0338] For example, the reinforcing separator 40 can be connected to the pouch cell 30 through thermally conductive adhesive, thereby facilitating heat exchange between the reinforcing separator 40 and the pouch cell 30. During the flow of the heat exchange medium through the heat exchange channel 43, the temperature of the pouch cell 30 can be regulated, for example, the temperature of the pouch cell 30 can be increased or decreased.

[0339] In some embodiments, referring to FIG8, at least a buffer layer 50 is sandwiched between two adjacent pouch cell 30, and the hardness of the buffer layer 50 is less than that of the outer shell 31.

[0340] A buffer layer 50 is sandwiched between at least some of two adjacent pouch battery cells 30. This can be either a buffer layer 50 sandwiched between some of two adjacent pouch battery cells 30 or a buffer layer 50 sandwiched between every two adjacent pouch battery cells 30.

[0341] In the above technical solution, by providing a buffer layer 50 between at least two adjacent soft-pack battery cells 30, and the hardness of the buffer layer 50 being less than that of the outer shell 31, the buffer layer 50 can absorb the expansion and deformation of the soft-pack battery cells 30, and the buffer layer 50 can provide buffer for the deformation of the adjacent soft-pack battery cells 30.

[0342] In some embodiments, the buffer layer 50 is a foam layer or a silicone layer.

[0343] In the above technical solution, by setting a reinforcing separator 40 between at least some adjacent soft-pack battery cells 30 to enhance the rigidity of the battery pack 20, and by setting the buffer layer 50 as a foam layer or a silicone layer, the buffer layer 50 has good flexibility and elastic deformation ability, so as to better absorb the expansion deformation of the soft-pack battery cells 30. In addition, the foam layer or silicone layer is lighter, which helps to reduce the overall weight of the battery device 100.

[0344] In some embodiments, referring to Figures 7 and 8, the buffer layer 50 and the reinforcing partition 40 are alternately arranged along a first direction.

[0345] In the above technical solution, by alternately setting the buffer layer 50 and the reinforcing separator 40 between the soft-pack battery cells 30 in the arrangement direction of the soft-pack battery cells 30, the multiple soft-pack battery cells 30 can be reinforced more uniformly, and the expansion deformation of the multiple soft-pack battery cells 30 along the thickness direction can be better buffered and absorbed.

[0346] In some embodiments, referring to Figures 13-17, electrode leads 33 are located on opposite sides of the pouch cell 30 along a second direction, which intersects with the first direction. Along the second direction and in the direction close to the side wall of the housing 10, the end of the reinforcing partition 40 protrudes from the housing 31 of the pouch cell 30 to form a fixed end 41, which is connected to the housing 10.

[0347] One of the two electrode leads 33 of the pouch cell 30 is the positive electrode lead 33, and the other of the two electrode leads 33 of the pouch cell 30 is the negative electrode lead 33. One of the two electrode leads 33 of the pouch cell 30 is located on one side of the pouch cell 30 along the second direction, and the other of the two electrode leads 33 of the pouch cell 30 is located on the other side of the pouch cell 30 along the second direction.

[0348] When a cavity 42 is formed within the reinforcing partition 40, the cavity 42 may not extend to the fixed end 41, meaning that the fixed end 41 of the reinforcing partition 40 can be a solid structure.

[0349] In the above technical solution, by making the end of the reinforcing separator 40 protrude from the outer shell 31 of the soft-pack battery cell 30 and connect it to the housing 10, since the reinforcing separator 40 is sandwiched between multiple soft-pack battery cells 30 and forms a battery pack 20 with the multiple soft-pack battery cells 30, the battery pack 20 can be connected and fixed to the side wall of the housing 10. Since the overall hardness of the reinforcing separator 40 is greater than that of the outer shell 31 of the soft-pack battery cell 30, the connection between the battery pack 20 and the housing 10 can be more reliable, thereby improving the installation reliability and stability of the battery pack 20 in the housing 10.

[0350] In some embodiments, referring to FIG17, the fixed end 41 and the electrode lead 33 located on the same side in the second direction are arranged along a third direction, and the first direction, the second direction and the third direction intersect each other.

[0351] The width of the fixed end 41 of the reinforcing partition 40 in the third direction can be smaller than the width of the other parts of the reinforcing partition 40 in the third direction.

[0352] For example, when the third direction is up and down, the fixed end 41 of the reinforcing partition 40 can be located above the electrode lead 33 located on the same side in the second direction.

[0353] In the above technical solution, by arranging the fixed end 41 of the reinforcing separator 40 and the electrode lead 33 located on the same side in the second direction along the third direction, the space inside the housing 10 along the third direction can be fully utilized to arrange the fixed end 41 of the reinforcing separator 40 and the electrode lead 33. This can better avoid contact or interference between the fixed end 41 of the reinforcing separator 40 and the electrode lead 33 located on the same side in the second direction due to their close proximity. This makes full use of the space inside the housing 10, resulting in a more compact internal structure layout of the battery device 100, which is beneficial to improving the energy density of the battery device 100.

[0354] In some embodiments, referring to Figures 16 and 17, a mounting bracket 15 is provided inside the housing 10. The mounting bracket 15 is located on at least one side of the battery pack 20 along the second direction and is connected to the housing 10. The fixed end 41 is connected to the mounting bracket 15.

[0355] The mounting bracket 15 is located on at least one side of the battery pack 20 along the second direction. The mounting bracket 15 may be located on one side of the battery pack 20 along the second direction, or it may be located on both sides of the battery pack 20 along the second direction.

[0356] For example, the mounting bracket 15 may include multiple sub-mounting brackets 151, which may be arranged along a first direction, and adjacent sub-mounting brackets 151 may be connected. The multiple sub-mounting brackets 151 may be formed independently; for example, adjacent sub-mounting brackets 151 may be welded together, connected by structural adhesive, or connected by fasteners 141; alternatively, the multiple sub-mounting brackets 151 may be integrally formed. A single sub-mounting bracket 151 may correspond to one reinforcing partition 40 or multiple reinforcing partitions 40.

[0357] In the above technical solution, by setting an installation bracket 15 inside the housing 10 and connecting the reinforcing partition 40 of the battery pack 20 to the housing 10 through the installation bracket 15, the stability and reliability of the connection between the reinforcing partition 40 and the housing 10 can be further improved, and the overall rigidity and strength of the battery device 100 can be increased.

[0358] In some embodiments, referring to Figures 16 and 17, the height dimension of the mounting bracket 15 in the third direction is smaller than the width dimension of the pouch cell 30 in the third direction, so as to form an arrangement space 16 on one side of the mounting bracket 15 along the third direction, wherein the first direction, the second direction and the third direction intersect each other.

[0359] For example, referring to Figure 17, the height dimension of the mounting bracket 15 in the third direction is h, and the width dimension of the soft-pack battery cell 30 in the third direction is W2, where h is less than W2.

[0360] For example, when the third direction is up and down, the mounting bracket 15 can be located at the lower part of the soft-pack battery cell 30, thereby forming an arrangement space 16 above the mounting bracket 15, which can be used to arrange the wiring structure of the battery pack 20.

[0361] In the above technical solution, by making the height dimension of the mounting bracket 15 in the third direction smaller than the width dimension of the soft-pack battery cell 30 in the third direction, an arrangement space 16 can be formed on one side of the mounting bracket 15 along the third direction. This arrangement space 16 can be used to arrange the wiring and other structures of the battery pack 20, thereby making the wiring structure layout of the battery pack 20 simpler and making full use of the space in the third direction inside the housing 10, making the internal structure layout of the battery device 100 more compact, which is beneficial to improving the energy density of the battery device 100.

[0362] In some embodiments, referring to FIG18, at least a portion of the pouch cell 30 is arranged along the thickness direction of the pouch cell 30. A baffle strip is provided inside the housing 10. The outer surface of the housing 31 includes adjacent bottom surfaces 311 and side surfaces 312. The bottom surfaces 311 are located on the lower side of the housing 31, and the side surfaces 312 are located on both sides of the pouch cell 30 in the thickness direction. A chamfer 313 is formed at the connection between the bottom surfaces 311 and the side surfaces 312. The housing 10 includes a bottom plate 12. The bottom surfaces 311 and the bottom plate 12 are connected by an adhesive layer 36. The baffle strip 35 is located on the outer periphery of the bottom surfaces 311, and at least a portion of the baffle strip 35 is located between the chamfer 313 and the bottom plate 12.

[0363] For example, the thickness direction of the soft-pack battery cell 30 can be seen in the e1 direction of Figure 18, and the vertical direction can be seen in the e3 direction of Figure 18.

[0364] At least some of the pouch cell 30 are arranged along the thickness direction of the pouch cell 30, which may include the following situations: some of the pouch cell 30 are arranged along the thickness direction of the pouch cell 30, or all of the pouch cell 30 are arranged along the thickness direction of the pouch cell 30.

[0365] The bottom surface 311 of the soft-pack battery cell 30 faces the base plate 12, and the side surfaces 312 of two adjacent soft-pack battery cells 30 are arranged facing each other in the thickness direction of the soft-pack battery cell 30.

[0366] Each pouch cell 30 has two side shells 312, and each side shell 312 has a chamfered portion 313 at the connection between it and the bottom shell 311. The chamfered portion 313 can be a rounded corner.

[0367] The adhesive strip 35 can extend along the length of the soft-pack battery cell 30. The length of the adhesive strip 35 can be basically the same as the length of the soft-pack battery cell 30.

[0368] At least a portion of the adhesive strip 35 is located between the chamfered portion 313 and the base plate 12, which may include the following situations: a portion of the adhesive strip 35 may be located between the chamfered portion 313 and the base plate 12, or the entire adhesive strip 35 may be located between the chamfered portion 313 and the base plate 12.

[0369] In the above technical solution, by setting a baffle strip 35 at the chamfered bottom of the soft-pack battery cell 30 and the baffle strip 35 being located between the chamfered portion 313 at the bottom of the soft-pack battery cell 30 and the base plate 12, when the bottom surface 311 of the soft-pack battery cell 30 is fixedly connected to the base plate 12 of the housing 10 through the adhesive layer 36, the baffle strip 35 can prevent the structural adhesive forming the adhesive layer 36 from overflowing into the gap between adjacent soft-pack battery cells 30, reducing the probability of the gap between adjacent soft-pack battery cells 30 forming a hard structure due to adhesive overflow, thereby improving the problem of local stress concentration between adjacent soft-pack battery cells 30 and reducing the risk of damage to the soft-pack battery cell 30.

[0370] In some embodiments, referring to FIG18, in the thickness direction of the pouch cell 30, two adjacent pouch cells 30 share a baffle strip 35.

[0371] Two adjacent pouch cell 30 share a common sealing strip 35. Part of the common sealing strip 35 is located between the chamfered portion 313 of one pouch cell 30 and the base plate 12, part of the common sealing strip 35 is located between the chamfered portion 313 of the other pouch cell 30 and the base plate 12, and part of the common sealing strip 35 is located in the gap between the two adjacent pouch cell 30.

[0372] In the above technical solution, by having two adjacent soft-pack battery cells 30 share a single adhesive strip 35, the two soft-pack battery cells 30 can use the shared adhesive strip 35 to prevent the structural adhesive forming the adhesive layer 36 from overflowing into the gap between the adjacent soft-pack battery cells 30. This reduces the number of adhesive strips 35 required, thereby reducing the number of adhesive strips 35 that need to be assembled, which is beneficial for reducing the assembly time of the battery device 100.

[0373] In some embodiments, the adhesive strip 35 is adhesive-blocking foam, and the adhesive strip 35 is bonded to the base plate 12; or, the adhesive strip 35 is a strip with adhesive on one side, and the adhesive strip 35 is bonded to the chamfered portion 313.

[0374] In the above technical solution, by using adhesive strip 35 as adhesive-blocking foam, which has good compressibility, the adhesive strip 35 can be better separated from the gap between the bottom surface 311 of the soft-pack battery cell 30 and the two adjacent soft-pack battery cells 30 by the adhesive strip 35 through the pressure of the soft-pack battery cell 30, so as to better prevent the adhesive layer 36 on the bottom surface of the soft-pack battery cell 30 from overflowing into the gap between the two adjacent soft-pack battery cells 30, and the adhesive strip 35 is bonded to the base plate 12, which facilitates the installation and fixation of the adhesive strip 35; or, by using adhesive strip 35 with single-sided back adhesive, the adhesive strip 35 is bonded to the chamfered part 313, which facilitates the bonding and fixation of the adhesive strip 35 to the chamfered part 313 of the soft-pack battery cell 30, so that the adhesive strip 35 and the soft-pack battery cell 30 are fixed as a whole, which facilitates the subsequent fixation of the soft-pack battery cell 30 to the base plate 12 of the housing 10 through the adhesive layer 36.

[0375] Thirdly, referring to FIG19, this application provides an electrical device 1000, including: a battery device 100 according to the second aspect of this application.

[0376] The electrical device 1000 can be a vehicle, and the battery device 100 can be installed at the bottom of the vehicle body 200.

[0377] In the above technical solution, the power device 1000 includes the battery device 100, which has a high energy density, which is beneficial to improving the overall performance of the power device 1000.

[0378] The battery pack 20 according to several embodiments of the present application is described below with reference to Figures 1-6.

[0379] Referring to Figures 1-4, in some embodiments of this application, the battery pack 20 includes a plurality of pouch cell battery cells 30 connected in sequence.

[0380] The pouch cell 30 includes a housing 31, an electrode assembly 32, and an electrode lead 33. The electrode assembly 32 is disposed inside the housing 31. The electrode lead 33 is electrically connected to the electrode assembly 32, and at least a portion of the electrode lead 33 is exposed outside the housing 31. The portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331. The lead-out portion 331 is formed in a sheet shape. In the width direction of the pouch cell 30, the lead-out portion 331 has rounded corners 332 at both ends in the width direction of the pouch cell 30. In the width direction of the pouch cell 30, the lead-out portion 331 is located on one side of the middle position of the width, so as to form a clearance space 34 on the side of the lead-out portion 331 near the middle position of the width.

[0381] The two electrode leads 33 of the pouch cell 30 are located on both sides of the pouch cell 30 along its length. In the battery pack 20, the positive electrode lead 33 of one of two adjacent pouch cells 30 is directly connected to the negative electrode lead 33 of the other two adjacent pouch cells 30, and the lead-out portions 331 of the electrode leads 33 of the two adjacent pouch cells 30 are welded together. All the pouch cells 30 in the battery pack 20 are connected in series, and all the pouch cells 30 in the battery pack 20 are arranged along the length of the pouch cell 30.

[0382] Referring to Figures 4-6, in some other embodiments of this application, the battery pack 20 includes a plurality of pouch cell battery cells 30 connected in sequence.

[0383] The pouch cell 30 includes a housing 31, an electrode assembly 32, and an electrode lead 33. The electrode assembly 32 is disposed inside the housing 31. The electrode lead 33 is electrically connected to the electrode assembly 32, and at least a portion of the electrode lead 33 is exposed outside the housing 31. The portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331. The lead-out portion 331 is formed in a sheet shape. In the width direction of the pouch cell 30, the lead-out portion 331 has rounded corners 332 at both ends in the width direction of the pouch cell 30. In the width direction of the pouch cell 30, the lead-out portion 331 is located on one side of the middle position of the width, so as to form a clearance space 34 on the side of the lead-out portion 331 near the middle position of the width.

[0384] The two electrode leads 33 of the pouch cell 30 are located on both sides of the pouch cell 30 along its length. In the battery pack 20, the positive electrode lead 33 of one of two adjacent pouch cells 30 is directly connected to the negative electrode lead 33 of the other two adjacent pouch cells 30. The lead-out portions 331 of the electrode leads 33 of the two adjacent pouch cells 30 are welded together. All the pouch cells 30 in the battery pack 20 are connected in series.

[0385] All the pouch cell 30s in the battery pack 20 are divided into multiple sub-cell packs 21. The multiple sub-cell packs 21 are arranged along the thickness direction of the pouch cell 30. Each sub-cell pack 21 includes one pouch cell 30. The lead-out portions 331 of two electrode leads 33 directly connected in two adjacent sub-cell packs 21 are connected and together form a connection portion 22. At least a portion of the connection portion 22 is curved. The connection portion 22 includes three straight segments 221 connected in sequence. An arc segment 222 is connected between two adjacent straight segments 221. The straight segment 221 located between two arc segments 222 can extend along the thickness direction of the pouch cell 30, and the other two straight segments 221 can extend along the length direction of the pouch cell 30. The lead-out portion 331 of the electrode lead 33 includes a connecting section 333. The connecting sections 333 of the two directly connected electrode leads 33 are stacked and connected in the thickness direction of the lead-out portion 331. The connection position of the two directly connected electrode leads 33 is the position where the connecting sections 333 of the two directly connected electrode leads 33 are stacked and connected. The connection position of the two directly connected electrode leads 33 can be located in the straight section 221 extending along the length direction of the soft-pack battery cell 30.

[0386] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0387] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, wherein, include: Multiple pouch battery cells are electrically connected in sequence. Each pouch battery cell includes a housing, an electrode assembly, and electrode leads. The electrode assembly is disposed inside the housing. The electrode leads are electrically connected to the electrode assembly, and at least a portion of the electrode leads are exposed outside the housing. The electrode leads of two adjacent pouch battery cells are directly connected.

2. The battery pack according to claim 1, wherein, The electrode leads of two adjacent pouch cell cells are welded together.

3. The battery pack according to claim 1, wherein, The electrode leads of two adjacent pouch cell cells are directly connected by conductive adhesive.

4. The battery pack according to any one of claims 1-3, wherein, The portion of the electrode lead exposed outside the housing is the lead-out portion, which is formed in a sheet shape.

5. The battery pack according to claim 4, wherein, In the width direction of the pouch battery cell, the lead-out portion has rounded corners at both ends in the width direction of the pouch battery cell.

6. The battery pack according to any one of claims 1-3, wherein, The portion of the electrode leads exposed outside the outer casing is called the lead-out portion, which is a flexible structure.

7. The battery pack according to any one of claims 1-3, wherein, The portion of the electrode lead exposed outside the housing is called the lead-out portion, and the thickness of the lead-out portion is 0.1mm to 0.5mm.

8. The battery pack according to any one of claims 1-3, wherein, The portion of the electrode lead exposed outside the outer casing is called the lead-out portion, and the width of the lead-out portion in the width direction of the soft-pack battery cell is 20mm to 60mm.

9. The battery pack according to any one of claims 1-3, wherein, The portion of the electrode lead exposed outside the outer casing is called the lead-out portion, and the length of the lead-out portion in the length direction of the soft-pack battery cell is 10mm to 50mm.

10. The battery pack according to any one of claims 1-3, wherein, The portion of the electrode lead exposed outside the housing is the lead-out portion, which is made of aluminum foil or copper foil.

11. The battery pack according to any one of claims 1-3, wherein, The portion of the electrode lead exposed outside the housing is the lead-out portion. The lead-out portion includes a connecting segment. The connecting segments of two directly connected electrode leads are stacked and connected. The ratio of the length dimension of the connecting segment in the length direction of the pouch battery cell to the length dimension of the lead-out portion in the length direction of the pouch battery cell is 1 / 4 to 1 / 2.

12. The battery pack according to any one of claims 1-11, wherein, The two electrode leads of the pouch cell are located on opposite sides along the length of the pouch cell.

13. The battery pack according to claim 12, wherein, The portion of the electrode lead exposed outside the housing is the lead-out portion. The middle position in the width direction of the pouch battery cell is the width midpoint. In the width direction of the pouch battery cell, the lead-out portion is located on one side of the width midpoint to form a clearance space on the side of the width midpoint close to the lead-out portion.

14. The battery pack according to any one of claims 1-13, wherein, The multiple pouch cells of the battery pack are connected in series.

15. The battery pack according to any one of claims 1-14, wherein, The device includes a thermal management component disposed on at least one side of the pouch cell in the thickness direction. The thermal management component is thermally connected to the pouch cell for heat exchange with the pouch cell.

16. The battery pack according to any one of claims 1-15, wherein, All the pouch cell batteries in the battery pack are arranged along the length of the pouch cell battery.

17. The battery pack according to any one of claims 1-15, wherein, All the pouch cell cells in the battery pack are divided into multiple sub-battery packs, which are arranged along the thickness direction of the pouch cell cells. Each sub-battery pack includes one pouch cell cell or multiple pouch cell cells arranged along the length direction of the pouch cell cell.

18. The battery pack according to claim 17, wherein, The portion of the electrode lead exposed outside the housing is the lead-out portion. The lead-out portions of two directly connected electrode leads in two adjacent sub-battery groups are connected and together form a connection portion, at least a portion of which is curved.

19. The battery pack according to claim 18, wherein, In the connection direction of the two directly connected electrode leads, the connection portion includes a plurality of straight segments connected in sequence, two adjacent straight segments are arranged at an angle and are connected by an arc segment, the arc segment extends along an arc, and the straight segment extends along a straight line.

20. The battery pack according to claim 19, wherein, The connection point of the two directly connected electrode leads is located in the straight section.

21. The battery pack according to any one of claims 17-20, wherein, It includes a reinforcing separator sandwiched between two adjacent pouch cell units, and the hardness of the reinforcing separator is greater than that of the outer shell.

22. The battery pack according to claim 21, wherein, The thickness of the reinforcing partition is 0.8mm to 2.0mm.

23. The battery pack according to claim 21, wherein, The reinforcing partition is made of aluminum plate, aluminum alloy plate, copper plate or steel plate.

24. The battery pack according to claim 21, wherein, The reinforcing partition is a solid structure.

25. The battery pack according to claim 21, wherein, The reinforcing partition has a cavity formed inside.

26. The battery pack according to claim 25, wherein, The cavity includes heat exchange channels for the flow of the heat exchange medium.

27. The battery pack according to any one of claims 1-26, wherein, The soft-pack battery cell can be any one of lithium iron phosphate battery cell, ternary lithium battery cell, and solid-state battery cell.

28. The battery pack according to claim 27, wherein, When the pouch battery cell is a lithium iron phosphate battery cell, the ratio of positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material of the pouch battery cell is 96:1-3:1-3; when the pouch battery cell is a ternary lithium battery cell, the ratio of positive electrode active material, positive electrode binder, and positive electrode conductive agent in the positive electrode material of the pouch battery cell is 96:2-3:1-2.

29. A battery device, wherein, include: Box; A battery pack is disposed within the housing, and the battery pack is the battery pack according to any one of claims 1-20.

30. The battery device according to claim 29, wherein, The battery packs are multiple.

31. The battery device according to claim 30, wherein, At least a portion of the battery pack is arranged along a first direction, and the thickness direction of each individual soft-pack battery cell is also set along the first direction.

32. The battery device according to claim 30, wherein, Multiple battery packs are connected in series and / or in parallel.

33. The battery device according to any one of claims 29-32, wherein, The thickness direction of each soft-pack battery cell is set along a first direction, the length direction of each soft-pack battery cell is set along a second direction, and the width direction of each soft-pack battery cell is set along a third direction. The first direction, the second direction, and the third direction intersect each other. The bottom plate and the top cover of the housing are located on opposite sides of the battery pack along the second direction.

34. The battery device according to any one of claims 29-33, wherein, The housing has a receiving cavity for accommodating the battery pack. The housing is provided with a constraint member extending along a first direction. The two ends of the constraint member in the length direction are respectively connected to the two side walls of the receiving cavity along the first direction.

35. The battery device according to claim 34, wherein, The two ends of the constraint member are connected and fixed to the box body by fasteners.

36. The battery device according to claim 34, wherein, The constraint component includes a constraint band and an insulating layer. The constraint band is a metal component, and the insulating layer covers the outer surface of the constraint band.

37. The battery device according to any one of claims 29-36, wherein, In a first direction, a reinforcing separator is sandwiched between at least two adjacent pouch cell units, the reinforcing separator being connected to the outer casing, and the hardness of the reinforcing separator being greater than that of the outer casing.

38. The battery device according to claim 37, wherein, The thickness of the reinforcing separator is less than the thickness of the individual soft-pack battery cells.

39. The battery device according to claim 37, wherein, The reinforcing partition is a metal plate.

40. The battery device according to claim 37, wherein, The reinforcing partition is a heat-conducting component and is thermally connected to the outer shell.

41. The battery device according to claim 37, wherein, The reinforcing partition is a solid structure.

42. The battery device according to claim 37, wherein, The reinforcing partition has a cavity inside.

43. The battery device according to claim 42, wherein, The cavity includes heat exchange channels for the flow of the heat exchange medium.

44. The battery device according to any one of claims 37-43, wherein, A buffer layer is sandwiched between at least two adjacent pouch cell units, and the hardness of the buffer layer is less than that of the outer casing.

45. The battery device according to claim 44, wherein, The buffer layer is a foam layer or a silicone layer.

46. ​​The battery device according to claim 44, wherein, The buffer layer and the reinforcing partition are alternately arranged along the first direction.

47. The battery device according to any one of claims 37-43, wherein, The electrode leads are located on opposite sides of the pouch cell along a second direction, which intersects with the first direction. Along the second direction and in the direction close to the side wall of the housing, the end of the reinforcing partition protrudes from the outer shell of the pouch cell to form a fixed end, which is connected to the housing.

48. The battery device according to claim 47, wherein, The fixed end and the electrode lead located on the same side in the second direction are arranged along a third direction, and the first direction, the second direction and the third direction intersect each other.

49. The battery device according to claim 47, wherein, The housing is provided with a mounting bracket, which is located on at least one side of the battery pack along the second direction and connected to the housing. The fixed end is connected to the mounting bracket.

50. The battery device according to claim 49, wherein, The height dimension of the mounting bracket in the third direction is smaller than the width dimension of the pouch battery cell in the third direction, so as to form an arrangement space on one side of the mounting bracket along the third direction, wherein the first direction, the second direction and the third direction intersect each other.

51. The battery device according to any one of claims 29-50, wherein, At least some of the pouch battery cells are arranged along the thickness direction of the pouch battery cells. The housing is provided with a baffle strip. The outer surface of the housing includes an adjacent bottom surface and a side surface. The bottom surface is located on the lower side of the housing. The side surfaces are located on both sides of the thickness direction of the pouch battery cells. A chamfer is formed at the connection between the bottom surface and the side surface. The housing includes a bottom plate. The bottom surface and the bottom plate are connected by an adhesive layer. The baffle strip is located on the outer periphery of the bottom surface and at least a portion of the baffle strip is located between the chamfer and the bottom plate.

52. The battery device according to claim 51, wherein, In the thickness direction of the pouch battery cell, two adjacent pouch battery cells share a single adhesive strip.

53. The battery device according to claim 51, 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 chamfered portion.

54. An electrical appliance, wherein, include: The battery device according to any one of claims 29-53.

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