Battery pack, battery device and electric device

Abstract

The utility model discloses a battery pack, battery device and power utilization device, battery pack includes: a plurality of soft package battery monomer that are electrically connected in proper order, soft package battery monomer includes shell, electrode subassembly and electrode lead, the electrode subassembly is provided in the shell, the electrode lead is electrically connected with the electrode subassembly, and at least part of the electrode lead is exposed out of the shell, and the electrode leads of two adjacent soft package battery monomers are directly connected. According to the battery pack disclosed by the utility model, the electric connection mode between the two adjacent soft package battery monomers in the battery pack is beneficial to improving the energy density of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack, a battery device and an electric device. Background Art

[0002] In the related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment, aerospace and other fields. Batteries can be roughly divided into soft-pack batteries and hard-shell batteries according to the hardness of the shell. Soft-pack batteries have the advantages of high mass / volume energy density and good safety, making the application of soft-pack batteries more and more extensive.

[0003] When multiple soft-pack battery cells are assembled into a group, the multiple soft-pack battery cells in the battery pack need to be electrically connected to form a battery pack. In the related art, the connection method of two adjacent soft-pack battery cells in the battery pack is not conducive to further improving the energy density of the battery pack. Therefore, how to design the connection method of two adjacent soft-pack battery cells in the multiple soft-pack battery cells in the battery pack to further improve the energy density of the battery pack is a technical problem to be solved. Utility Model Content

[0004] In view of the above problems, the utility model provides a battery pack, a battery device and an electrical device, wherein the electrical connection method between two adjacent soft-pack battery cells in the battery pack is conducive to improving the energy density of the battery pack.

[0005] In a first aspect, the utility model provides a battery pack, comprising: a plurality of soft-pack battery cells electrically connected in sequence, the soft-pack battery cells comprising a shell, an electrode assembly and an electrode lead, the electrode assembly being disposed in the shell, the electrode lead being electrically connected to the electrode assembly and at least part of the electrode lead being exposed outside the shell, and the electrode leads of two adjacent soft-pack battery cells being directly connected.

[0006] In the above technical solution, by directly connecting the electrode leads of two adjacent soft-pack battery cells in the battery pack, the electrical connection devices between the soft-pack battery cells can be omitted or reduced, the number of parts of the battery pack can be reduced, and the space occupied by the electrical connection devices can be saved, which is beneficial to improving the energy density of the battery pack. In addition, since the electrical connection devices between the soft-pack battery cells are omitted or reduced, the cost can also be reduced.

[0007] In some embodiments, the electrode leads of two adjacent soft-pack battery cells are connected by welding.

[0008] In the above technical solution, the electrode leads of two adjacent soft-pack battery cells in the battery pack are connected by welding, thereby achieving direct connection of the terminals of two adjacent soft-pack battery cells in the battery pack, making the connection method of the electrode leads of two adjacent soft-pack battery cells in the battery pack simple and reliable.

[0009] In some embodiments, the electrode leads of two adjacent soft-pack battery cells are directly connected by conductive adhesive.

[0010] In the above technical solution, the electrode leads of two adjacent soft-pack battery cells in the battery pack are connected by conductive glue, thereby achieving direct connection of the terminals of two adjacent soft-pack battery cells in the battery pack, making the connection method of the electrode leads of two adjacent soft-pack battery 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, and the lead-out portion is formed in a sheet shape.

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

[0013] In some embodiments, in a width direction of the soft-pack battery cell, both ends of the lead-out portion in the width direction of the soft-pack battery cell are formed with rounded corners.

[0014] In the above technical solution, by forming chamfers at both ends of the lead-out portion, the risk of the lead-out portion scratching other structures or the human body can be reduced during the process of connecting 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, and the lead-out portion is a flexible structure.

[0016] In the above technical solution, the electrode leads of two adjacent soft-pack battery cells are directly connected by defining the portion of the electrode lead exposed outside the shell as a lead-out portion. In fact, 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. In this way, the lead-out portion can be bent into a set shape or not bent as needed, thereby making the connection of the lead-out portions of the two electrode leads more flexible and making the arrangement of multiple soft-pack battery 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 electrode lead exposed outside the outer shell is defined as a lead-out portion, and the electrode leads of two adjacent soft-pack battery cells are directly connected. In fact, the lead-out portions of the two electrode leads are directly connected. By setting the thickness of the lead-out portion to 0.1 mm to 0.5 mm, the thickness of the lead-out portion can better meet the demand for excessive current, and the structural strength of the lead-out portion can meet the demand. In addition, the lead-out portion can also have good flexibility, so as to reduce the process difficulty of bending and deforming the lead-out portion when the lead-out portion needs to be bent and deformed.

[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 soft-pack battery cell is 20 mm to 60 mm.

[0020] In the above technical solution, by defining the outer part of the electrode lead exposed to the outer shell as a lead-out portion, the electrode leads of two adjacent soft-pack battery cells are directly connected, which is actually the direct connection of the lead-out portions of the two electrode leads. By setting the width dimension of the lead-out portion in the width direction of the soft-pack battery cell to 20 mm to 60 mm, the width dimension of the lead-out portion can better meet the excessive current demand, and the connection area of ​​the two electrode leads can be larger, thereby improving the stability and reliability of the connection of 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 soft-pack battery cell is 10 mm to 50 mm.

[0022] In the above technical solution, by defining the outer part of the electrode lead exposed to the outer shell as a lead-out portion, the electrode leads of two adjacent soft-pack battery cells are directly connected, which is actually the direct connection of the lead-out portions of the two electrode leads. By setting the length dimension of the lead-out portion in the length direction of the soft-pack battery cell to 10 mm to 50 mm, the width dimension of the lead-out portion can better meet the excessive current demand, and the connection area of ​​the two electrode leads can be made larger, thereby improving the stability and reliability of the connection of the two electrode leads.

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

[0024] In the above technical solution, the portion of the electrode lead exposed outside the shell is defined as a lead-out portion, and the electrode leads of two adjacent soft-pack battery cells are directly connected. In fact, the lead-out portions of the two electrode leads are directly connected. By using aluminum foil or copper foil as the material of the lead-out portion, the lead-out portion can have good conductivity; in addition, the lead-out portion can also have good flexibility, so as to reduce the process difficulty of bending and deforming the lead-out portion when the lead-out portion needs to be bent and deformed.

[0025] In some embodiments, the portion of the electrode lead exposed outside the outer shell is a lead-out portion, and the lead-out portion includes a connecting section. The connecting sections of two directly connected electrode leads are overlapped and connected, and the ratio of the length dimension of the connecting section in the length direction of the soft-pack battery cell to the dimension of the lead-out portion in the length direction of the soft-pack battery cell is 1 / 4 to 1 / 2.

[0026] In the above technical solution, by defining the portion of the electrode lead exposed outside the shell as a lead-out portion, the electrode leads of two adjacent soft-pack battery cells are directly connected, which is actually the direct connection of the lead-out portions of the two electrode leads. By making the ratio of the length dimension of the overlapping portion of the two lead-out portions in the length direction of the soft-pack battery cell to the dimension of the lead-out portion in the length direction of the soft-pack battery cell be 1 / 4 to 1 / 2, the overlapping connection length of the two electrode leads can be made larger, thereby improving the stability and reliability of the connection of the two electrode leads; and, a portion of the lead-out portion can be left out so that the overlapping connection portion of the two electrode leads is separated from the shell, thereby facilitating the direct connection operation of the two electrode leads.

[0027] In some embodiments, the two electrode leads of the soft-pack battery cell are located on opposite sides of the soft-pack battery cell in a length direction.

[0028] In the above technical solution, by locating the two electrode leads of the soft-pack battery cell at the opposite sides in the length direction of the soft-pack battery cell, when the multiple soft-pack battery cells are electrically connected in sequence, the multiple soft-pack battery cells can be connected into a long string, and the number of soft-pack battery cells in the battery pack is less restricted. It is possible to realize a battery pack with a small number of soft-pack battery cells and a battery pack with a large number of soft-pack battery cells, so that the number of soft-pack battery cells in the battery pack can be set more flexibly.

[0029] In some embodiments, the portion of the electrode lead exposed outside the outer shell is a lead-out portion, the middle position in the width direction of the soft-pack battery cell is the middle position of the width, and in the width direction of the soft-pack battery cell, the lead-out portion is located on one side of the middle position of the width to form an avoidance space on one side of the lead-out portion close to the middle position of the width.

[0030] In the above technical solution, the electrode leads of two adjacent soft-pack battery cells are directly connected by defining the portion of the electrode lead exposed outside the shell as a lead-out portion, which is actually the direct connection of the lead-out portions of the two electrode leads. By arranging the lead-out portion on one side of the middle position in the width direction of the soft-pack battery cell, an avoidance space can be formed on one side of the lead-out portion close to the middle position of the width. The avoidance space can make room for the arrangement of other structures, thereby improving the compactness of the overall structure of the battery pack and thus facilitating the improvement of the energy density of the battery pack.

[0031] In some embodiments, the plurality of soft-pack battery cells of the battery pack are sequentially connected in series.

[0032] In the above technical solution, by sequentially connecting a plurality of soft-pack battery 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, which is disposed on at least one side of the soft-pack battery cell in a thickness direction, and is thermally connected to the soft-pack battery cell for heat exchange with the soft-pack battery cell.

[0034] In the above technical solution, by providing a thermal management component and making the thermal management component located on at least one side in the thickness direction of the soft-pack battery cell, the temperature of the soft-pack battery cell can be regulated to within an appropriate range through heat exchange between the thermal management component and the soft-pack battery cell.

[0035] In some embodiments, all of the soft-pack battery cells in the battery pack are arranged along a length direction of the soft-pack battery cells.

[0036] In the above technical solution, by arranging all the soft-pack battery cells of the battery pack along the length direction of the soft-pack battery cells, the arrangement of the multiple soft-pack battery cells of the battery pack can be relatively simple, and the process of assembling the multiple soft-pack battery cells to form the battery pack can be relatively simple.

[0037] In some embodiments, all of the soft-pack battery cells in the battery pack are divided into multiple sub-battery groups, and the multiple sub-battery groups are arranged along the thickness direction of the soft-pack battery cell, and each of the sub-battery groups includes one soft-pack battery cell or includes multiple soft-pack battery cells arranged along the length direction of the soft-pack battery cell.

[0038] In the above technical solution, by dividing the multiple soft-pack battery cells of the battery pack into sub-battery groups arranged along the thickness direction of the soft-pack battery cells, the overall arrangement structure of the battery pack can be made compact, and the arrangement method of the multiple soft-pack battery cells in the battery pack can be set as needed, which also makes the arrangement method of the multiple soft-pack 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, and the lead-out portions of two directly connected electrode leads in two adjacent sub-battery groups are connected to form a connecting portion, and at least a portion of the connecting portion is curved.

[0040] In the above technical solution, the portion of the electrode lead exposed outside the outer shell is defined as a lead-out portion, and the electrode leads of two adjacent soft-pack battery cells are directly connected, which is actually the direct connection of the lead-out portions of the two electrode leads. By forming a connecting portion together with the lead-out portions of the two directly connected electrode leads in two adjacent battery packs, and setting the connecting portion to a curved shape, it is convenient to arrange multiple sub-battery groups in the battery pack along the thickness direction of the soft-pack battery cell.

[0041] In some embodiments, in the connection direction of the two directly connected electrode leads, the connecting 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 line, and the straight segment extends along a straight line.

[0042] In the above technical solution, the connecting portion formed by two directly connected lead-out portions is set to be curved, and adjacent straight sections of the connecting portion are connected by arc sections. This can reduce the appearance of sharp corners or edges in the connecting portion and reduce stress concentration at the sharp corners or edges of the connecting portion.

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

[0044] In the above technical solution, by making the connection position of the two directly connected electrode leads located at the straight section of the connecting part rather than the arc section, the connection position of the two directly connected electrode leads can be located at a position with less stress, thereby reducing the influence of stress on the connection of the electrode leads and improving the reliability and stability of the connection of the two directly connected electrode leads.

[0045] In some embodiments, the battery pack includes a reinforcing partition, which is sandwiched between two adjacent soft-pack battery cells, and the hardness of the reinforcing partition is greater than the hardness of the outer shell.

[0046] In the above technical solution, by arranging a reinforcing partition between adjacent soft-pack battery cells and making the hardness of the reinforcing partition greater than the hardness of the outer shell, it is convenient to group multiple soft-pack battery cells, and the overall stiffness of the battery pack formed by the grouping of multiple soft-pack battery cells can be improved, thereby facilitating the installation of the battery pack formed by the grouping of multiple soft-pack battery cells 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 partition to be not less than 0.8mm, the battery pack formed by the grouping of multiple soft-pack battery cells with the reinforced partition can have an effective reinforcement effect. At the same time, the thickness of the reinforcing partition is not more than 2.0mm, so that the reinforcing partition can reduce the space occupied by the reinforcing partition while playing an effective reinforcement role, so that the battery pack has a higher energy density. By setting the thickness of the reinforcing partition to 0.8mm~2.0mm, the overall strength and rigidity of the battery pack can be effectively improved, and the overall energy density of the battery pack can be made 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 partition to an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate and other materials, the reinforcing partition can have higher strength and hardness, thereby better improving the overall stiffness of a group of multiple soft-pack battery cells and better reducing the deformation of the grouped 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 partition as a solid structure, the reinforcing partition can have better structural strength and rigidity, and can play an effective reinforcing role when the thickness of the reinforcing partition is small, which is beneficial for the battery pack as a whole to have better strength and rigidity while having a higher volume energy density.

[0053] In some embodiments, a cavity is formed in the reinforced partition.

[0054] In the above technical solution, by setting a cavity in the reinforcing partition, while the reinforcing partition plays a role in enhancing the overall stiffness of the soft-pack battery cells after being grouped, the cavity in the reinforcing partition can absorb the expansion and deformation of the soft-pack battery cells. The cavity in the reinforcing partition can provide a buffer for the deformation of adjacent soft-pack battery cells and is beneficial to reducing the weight of the reinforcing partition.

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

[0056] In the above technical solution, at least part of the cavity in the reinforced partition constitutes a heat exchange channel. When the heat exchange medium flows through the heat exchange channel in the reinforced partition, the heat exchange medium can exchange heat with the soft-pack battery monomer, thereby effectively adjusting the temperature of the soft-pack battery monomer.

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

[0058] In the above technical scheme, in the embodiment where the soft-pack battery cell is a lithium iron phosphate battery cell, the safety of the soft-pack battery cell can be improved and the cycle life of the soft-pack battery cell can be extended; in the embodiment where the soft-pack battery cell is a ternary lithium battery cell, the energy density of the soft-pack battery cell can be improved and the cruising range can be improved; in the embodiment where the soft-pack 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 soft-pack battery cell is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell, the usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent is 96:1-3:1-3; when the battery cell is a ternary lithium battery cell, in the positive electrode material of the soft-pack battery cell, the usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent is 96:2-3:1-2.

[0060] In the above technical scheme, in an embodiment where the soft-pack battery cell is a lithium iron phosphate battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the electrochemical performance and mechanical stability of the soft-pack battery cell; in an embodiment where the soft-pack battery cell is a ternary lithium battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the energy density and cycle life of the battery.

[0061] In a second aspect, the utility model provides a battery device, comprising: a box; a battery pack disposed in the box, wherein the battery pack is the battery pack of the first aspect of the utility model.

[0062] In the above technical solution, the battery device includes the above-mentioned battery pack, which can save or reduce the electrical connection devices between the soft-pack battery cells, and can reduce the number of parts of the battery pack, thereby saving the space occupied by the electrical connection devices, which is beneficial to improve the energy density of the battery pack, thereby helping to improve the density of the battery device, and because the electrical connection devices between the soft-pack battery cells are saved or reduced, the cost can also be reduced.

[0063] In some embodiments, the battery pack is multiple.

[0064] In the above technical solution, by making the battery device include the above-mentioned multiple battery groups, the battery device can have a larger capacity and the overall energy density of the battery device can be higher.

[0065] In some embodiments, at least a portion of the battery pack is arranged along a first direction, and the thickness directions of the soft-pack battery cells are all arranged along the first direction.

[0066] In the above technical solution, by arranging at least part of the multiple battery packs along the thickness direction of the soft-pack battery cell, the multiple battery packs in the battery device can be arranged more compactly, which is beneficial to improving the energy density of the battery device.

[0067] In some embodiments, a plurality of the battery packs are connected in series and / or in parallel.

[0068] In the above technical solution, 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 connecting multiple battery packs in series and parallel, the battery device can have a higher output voltage and a higher output current.

[0069] In some embodiments, the thickness directions of the soft-pack battery cells are arranged along the first direction, the length directions of the soft-pack battery cells are arranged along the second direction, and the width directions of the soft-pack battery cells are arranged along the third direction. The first direction, the second direction and the third direction intersect with each other, and the bottom plate and the top cover of the box body are respectively located on opposite sides of the battery pack along the second direction.

[0070] In the above technical solution, by arranging the thickness directions of multiple soft-pack battery cells along the first direction, the length directions of multiple soft-pack battery cells along the second direction, and the width directions of multiple soft-pack battery cells along the third direction, and by arranging the bottom plate and the top cover of the box body on both sides of the second direction of the battery pack, respectively, the multiple soft-pack battery cells in the battery device can be arranged more compactly and in a simple manner, so that the multiple soft-pack battery cells can be conveniently assembled into the box body after being grouped.

[0071] In some embodiments, the box body has a housing cavity for accommodating the battery pack, and a restraining member extending along a first direction is provided in the box body, and both ends of the restraining member in the length direction are respectively connected to two side walls of the housing cavity along the first direction.

[0072] In the above technical solution, a restraint extending in the thickness direction of the soft-pack battery cell is provided in the box body, and the two ends of the restraint in the length direction are respectively connected and fixed to the box body, and the two side walls of the accommodating cavity along the first direction are tightened by the restraint, so that the restraint can restrain and suppress the expansion deformation of the soft-pack battery cell in its thickness direction.

[0073] In some embodiments, both ends of the restraining member are connected and fixed to the box body by fasteners.

[0074] In the above technical solution, by allowing the two ends of the restraint to pass through the two ends of the fastener and the box body, the two ends of the restraint can be more stably locked on the box body, so that the restraint can better restrain and inhibit the expansion and deformation of the soft-pack battery cell in its thickness direction.

[0075] In some embodiments, the restraint member includes a restraint belt and an insulating layer, the restraint belt is a metal member, and the insulating layer is coated on the outer surface of the restraint belt.

[0076] In the above technical solution, by configuring the restraint to include a restraint belt and an insulating layer, and making the restraint belt a metal part, the restraint can have better structural strength, so that the restraint can better restrain and inhibit the expansion and deformation of the soft-pack battery cell in the thickness direction; and by making the outside of the restraint a coated insulating layer, while making the restraint adopt a restraint belt made of a metal material to better restrain and inhibit the expansion and deformation of the soft-pack battery cell in the thickness direction, it can avoid problems such as short circuits between the restraint and the soft-pack battery cell and other components due to electrical contact.

[0077] In some embodiments, in the first direction, a reinforcing partition is sandwiched between at least part of two adjacent soft-pack battery cells, the reinforcing partition is connected to the outer shell, and the hardness of the reinforcing partition is greater than the hardness of the outer shell.

[0078] In the above technical solution, by providing a reinforcing partition between at least two adjacent soft-pack battery cells and making the hardness of the reinforcing partition greater than the hardness of the outer shell, it is convenient to group multiple soft-pack battery cells, and the overall stiffness of the grouped multiple soft-pack battery cells can be improved, thereby facilitating the installation of the multiple soft-pack battery cells after grouping 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 soft-pack battery cell.

[0080] In the above technical solution, by making the thickness of the reinforcing partition smaller than the thickness of the soft-pack battery cell, the overall stiffness of the group of multiple soft-pack battery cells can be improved while reducing the space occupied by the reinforcing partition, especially reducing the space occupied by the reinforcing partition in the thickness direction of the soft-pack battery cell, so that the overall energy density of the battery device is higher.

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

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

[0083] In some embodiments, the reinforcing partition is a heat conductive member and is thermally connected to the housing.

[0084] In the above technical solution, by setting the reinforcing partition as a heat conductive member and thermally connecting it to the outer shell, the reinforcing partition can enhance the overall stiffness of the soft-pack battery cells after being grouped, and at the same time, the reinforcing partition can have a thermal management function. Through the heat exchange between the reinforcing partition and the soft-pack battery cells, the temperature of the soft-pack battery cells can be adjusted so that the soft-pack battery cells 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 partition as a solid structure, the reinforcing partition can have better structural strength and rigidity, and can play an effective reinforcing role when the thickness of the reinforcing partition is small, which is beneficial for the battery pack as a whole to have better strength and rigidity while having a higher volume energy density.

[0087] In some embodiments, a cavity is formed in the reinforced partition.

[0088] In the above technical solution, by setting a cavity in the reinforcing partition, while the reinforcing partition plays a role in enhancing the overall stiffness of the soft-pack battery cells after being grouped, the cavity in the reinforcing partition can absorb the expansion and deformation of the soft-pack battery cells. The cavity in the reinforcing partition can provide a buffer for the deformation of adjacent soft-pack battery cells and is beneficial to reducing the weight of the reinforcing partition.

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

[0090] In the above technical solution, at least part of the cavity in the reinforced partition constitutes a heat exchange channel. When the heat exchange medium flows through the heat exchange channel in the reinforced partition, the heat exchange medium can exchange heat with the soft-pack battery monomer, thereby effectively adjusting the temperature of the soft-pack battery monomer.

[0091] In some embodiments, a buffer layer is sandwiched between at least some adjacent two of the soft-pack battery cells, and the hardness of the buffer layer is less than the hardness of the outer shell.

[0092] In the above technical solution, by arranging a buffer layer between at least part of two adjacent soft-pack battery cells and the hardness of the buffer layer is less than the hardness of the shell, the buffer layer can absorb the expansion and deformation of the soft-pack battery cells, and the buffer layer can provide a buffer for the deformation of adjacent soft-pack battery cells.

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

[0094] In the above technical solution, a reinforcing partition is provided between at least part of two adjacent soft-pack battery cells to strengthen the rigidity of the battery pack, and at the same time, the buffer layer is provided as a foam layer or a silicone layer, so that 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, and the foam layer or the silicone layer is light in weight, which is beneficial to reducing the overall weight of the battery device.

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

[0096] In the above technical solution, by alternately arranging the buffer layer and the reinforcing partition 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 evenly, 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 soft-pack battery cell along a second direction, the second direction intersects with the first direction, and along the second direction and in a direction close to the side wall of the box body, the end of the reinforcing partition protrudes from the outer shell of the soft-pack battery cell to form a fixed end, and the fixed end is connected to the box body.

[0098] In the above technical solution, by making the end of the reinforcing partition along the second direction protrude from the outer shell of the soft-pack battery cell and be connected to the box body, since the reinforcing partition is sandwiched between multiple soft-pack battery cells and grouped with multiple soft-pack battery cells to form a battery pack, the battery pack can be connected and fixed to the side wall of the box body. Since the hardness of the reinforcing partition is generally greater than the outer shell of the soft-pack battery cell, the connection between the battery pack and the box body can be more reliable, thereby improving the installation reliability and stability of the battery pack in the box body.

[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 partition and the electrode lead located on the same side in the second direction along the third direction, the space in the box along the third direction can be fully utilized to arrange the fixed end of the reinforcing partition and the electrode lead, which can better avoid contact or interference between the fixed end of the reinforcing partition and the electrode lead located on the same side in the second direction due to their close distance, so that the space in the box can be fully utilized, and the structural layout in the battery device is more compact, which is beneficial to improving the energy density of the battery device.

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

[0102] In the above technical solution, by arranging a mounting bracket in the box body and connecting the reinforcing partition of the battery pack to the box body through the mounting bracket, the stability and reliability of the connection between the reinforcing partition and the box body can be further improved, and the overall rigidity and strength of the battery device can be higher.

[0103] In some embodiments, the height dimension of the mounting bracket in the third direction is smaller than the width dimension of the soft-pack battery cell in the third direction, so as to form an arrangement space on one side of the mounting bracket along the third direction, and 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, and the layout space can be used to arrange the wiring structure of the battery pack, thereby making the wiring structure layout of the battery pack simpler, and can make full use of the space along the third direction inside the box, so that the structural layout inside the battery device is more compact, which is beneficial to improving the energy density of the battery device.

[0105] In some embodiments, at least part of the soft-pack battery cells are arranged along the thickness direction of the soft-pack battery cells, a rubber barrier strip is provided in the box body, the outer surface of the shell includes adjacent shell bottom surfaces and shell side surfaces, the shell bottom surface is located on the lower side of the shell, and the shell side surfaces are located on both sides of the thickness direction of the soft-pack battery cells, a chamfer is formed at the connection between the shell bottom surface and the shell side surface, the box body includes a bottom plate, the shell bottom surface and the bottom plate are connected by an adhesive layer, the rubber barrier strip is located on the outer peripheral side of the shell bottom surface and at least part of the rubber barrier strip is located between the chamfer and the bottom plate.

[0106] In the above technical solution, by arranging a rubber barrier strip at the chamfer at the bottom of the soft-pack battery cell and the rubber barrier strip is located between the chamfer at the bottom of the soft-pack battery cell and the bottom plate, when the bottom surface of the shell of the soft-pack battery cell is fixedly connected to the bottom plate of the box body through the adhesive layer, the arranged rubber barrier strip can prevent the structural adhesive forming the above-mentioned adhesive layer from overflowing into the gap between adjacent soft-pack battery cells, thereby reducing the probability of forming a hard structure in the gap between adjacent soft-pack battery cells due to overflowing glue, thereby improving the problem of local stress concentration between adjacent soft-pack battery cells and reducing the risk of damage to the soft-pack battery cells.

[0107] In some embodiments, in the thickness direction of the soft-pack battery cells, two adjacent soft-pack battery cells share a rubber barrier strip.

[0108] In the above technical solution, by allowing two adjacent soft-pack battery cells to share a common rubber barrier strip, the two soft-pack battery cells can use the common rubber barrier strip to block the structural adhesive forming the above-mentioned adhesive layer from overflowing into the gap between the adjacent soft-pack battery cells, thereby reducing the number of rubber barrier strips to be set, thereby reducing the number of rubber barrier strips that need to be assembled, which is beneficial to reducing the assembly time of the battery device.

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

[0110] In the above technical scheme, by making the blocking rubber strip into a blocking rubber foam with good compressibility, and squeezing the blocking rubber strip through the soft-pack battery cell, the gap between the bottom surface of the shell of the soft-pack battery cell and two adjacent soft-pack battery cells can be better separated by the blocking rubber strip, so as to better prevent the adhesive layer located on the bottom surface of the soft-pack battery cell from overflowing into the gap between two adjacent soft-pack battery cells, and the blocking rubber strip is bonded to the bottom plate, so as to facilitate the installation and fixation of the blocking rubber strip; or, by making the blocking rubber strip into a strip with adhesive on one side, the blocking rubber strip is bonded to the chamfered portion, so as to facilitate the bonding and fixation of the blocking rubber strip to the chamfered portion of the soft-pack battery cell, so that the blocking rubber strip and the soft-pack battery cell are fixed as a whole, so as to facilitate the subsequent fixation of the soft-pack battery cell to the bottom plate of the box through the adhesive layer.

[0111] In a third aspect, the utility model provides an electrical device, comprising: a battery device according to the second aspect of the utility model.

[0112] In the above technical solution, the electrical device includes the above battery device, which has a higher energy density and is beneficial to improving the overall performance of the electrical device.

[0113] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0115] Figure 1 is a schematic diagram of a battery pack according to some embodiments of the present utility model;

[0116] Figure 2 yes Figure 1 A front view of the battery pack in FIG.

[0117] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0118] Figure 4 is a schematic diagram of a soft-pack battery cell in a battery pack according to some embodiments of the utility model;

[0119] Figure 5 is a schematic diagram of a battery pack according to some embodiments of the present utility model;

[0120] Figure 6 yes Figure 5 The enlarged view of point B in the middle;

[0121] Figure 7is a schematic diagram of a battery pack according to some embodiments of the present utility model;

[0122] Figure 8 yes Figure 7 Enlarged view of point C in the middle;

[0123] Fig. 9 is a cross-sectional schematic diagram of a reinforcing partition in a battery pack according to some embodiments of the utility model;

[0124] Fig.10 is a schematic diagram of a battery device according to some embodiments of the present utility model;

[0125] Fig.11 yes Fig.10 A front view of a battery device in FIG.

[0126] Fig.12 is along Fig.11 Sectional view of the mid-DD line;

[0127] Fig.13 yes Fig.10 A schematic diagram of the internal structure of the battery device in which the top cover is removed;

[0128] Fig.14 is a schematic diagram of the arrangement of battery packs in a battery device according to some embodiments of the utility model;

[0129] Fig.15 yes Fig.14 Enlarged view of point E in the middle;

[0130] Fig.16 is a schematic diagram of the cooperation between a battery pack and a mounting bracket in a battery device according to some embodiments of the utility model;

[0131] Fig.17 yes Fig.16 The enlarged view of F in the middle;

[0132] Fig.18 It is a schematic diagram of fixing a plurality of soft-pack battery cells in a battery device and a bottom plate of a box according to some embodiments of the utility model;

[0133] Fig.19 It is a schematic diagram of an electrical device according to some embodiments of the utility model.

[0134] Reference numerals:

[0135] 1000. Electrical devices;

[0136] 100. Battery device;

[0137] 10. Box body; 11. Top cover; 12. Bottom plate; 13. Accommodating cavity; 14. Constraint; 141. Fastener; 15. Mounting bracket; 151. Sub-mounting bracket; 16. Layout space;

[0138] 20. battery pack; 21. sub-battery pack; 22. connecting portion; 221. straight segment; 222. arc segment;

[0139] 30. Soft-pack battery cell; 31. Shell; 311. Shell bottom; 312. Shell side; 313. Chamfered portion; 32. Electrode assembly; 33. Electrode lead; 331. Lead-out portion; 332. Chamfered corner; 333. Connecting section; 34. Avoidance space; 35. Rubber strip; 36. Adhesive layer;

[0140] 40. Strengthening baffle; 41. Fixed end; 42. Cavity; 43. Heat exchange flow channel; 50. Buffer layer;

[0141] 200. Car body. DETAILED DESCRIPTION

[0142] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0143] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those generally understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention in the application are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0144] The reference to "embodiment" in the present invention means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0145] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "attachment" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0146] The term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0147] In the embodiments of the present invention, the same reference numerals represent 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 the present invention shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present invention.

[0148] The term “plurality” used in the present invention refers to two or more (including two).

[0149] In the embodiments of the present invention, unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form a new technical solution.

[0150] In the embodiments of the present invention, unless otherwise specified, all technical features and optional technical features of the present invention can be combined with each other to form a new technical solution.

[0151] In an embodiment of the utility model, a battery apparatus may include one or more battery packs for providing voltage and capacity. A battery pack may include a plurality of soft-pack battery cells. The battery apparatus may be a battery pack, which includes a box and one or more battery packs, and the battery packs are accommodated in the box.

[0152] In an embodiment of the utility model, the box may include a first box and a second box. The first box and the second box are buckled together so that a closed space is formed inside the box to accommodate the battery pack. Enclosed here means covered or closed, which can be sealed or unsealed. The first box may be a top cover or a bottom plate. For example, the box may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box to accommodate the battery pack.

[0153] In the embodiment of the utility model, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0154] In the embodiment of the present invention, the soft-pack battery monomer can be a secondary battery, which refers to a battery monomer that can be used continuously by activating the active material by charging after the soft-pack battery monomer is discharged; the soft-pack battery monomer can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiment of the present invention. The soft-pack battery monomer can be a flat body, a rectangular parallelepiped or other shapes, which is not limited in the embodiment of the present invention.

[0155] As the smallest energy unit of a battery device, a soft-pack battery cell includes a shell and an electrode assembly disposed in the shell. The electrode assembly is a component in the soft-pack battery cell where an electrochemical reaction occurs. One or more electrode assemblies may be contained in the shell. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a lug. The positive electrode lug and the negative electrode lug may be located at both ends of the main body, respectively.

[0156] The positive electrode sheet may include a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer includes a positive electrode active material.

[0157] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0158] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, silver surface treated aluminum or stainless steel, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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.).

[0159] 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; alternatively, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the soft pack battery monomer. However, the utility model is not limited to these materials, and other traditional materials that can be used as battery positive electrode film layers can also be used. These positive electrode active materials can be used alone or in combination of two or more.

[0160] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0161] Layered transition metal oxides include those of the general formula Li a Ni b Co c M d O e A f At least one of the compounds and modified compounds thereof. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B, and A includes at least one of N, F, S and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0162] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM333), LiNi 0.5 Co0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi0.8Co 0.1 Mn 0.1 O2 (also referred to as NCM811), LiNi 0.9 Co 0.05 Mn 0.05 O2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0163] In the embodiment of the utility model, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0164] In the examples of the present invention, the molar content of oxygen in the positive electrode active materials is only a theoretical value. The release of oxygen from the lattice will cause the molar content of oxygen to change. In reality, the molar content of oxygen will fluctuate.

[0165] In the embodiment of the utility model, the content of the elements in the positive electrode active material has a well-known meaning in the art, and can be detected by equipment and methods well-known in the art, for example, with reference to EPA 6010D-2014, tested by inductively coupled plasma atomic emission spectrometry, and measured by plasma atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, weigh 0.4 g of the positive electrode active material and add 10 ml (50% concentration) of aqua regia thereto. Then place it on a plate at 180°C for 30 minutes. After digestion on the plate, dilute to a volume of 100 mL, and use the standard curve method for quantitative testing.

[0166] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode film layer may not be provided on the surface of the foamed metal, but of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0167] In some embodiments, the positive electrode film layer may further include a positive electrode conductive agent. The present utility model embodiment has no particular restrictions on the type of positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0168] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The present utility model embodiment has no particular restrictions on the type of positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0169] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector, 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 them evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0170] In some embodiments, the negative electrode may be a negative electrode plate, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0171] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0172] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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.).

[0173] As an example, the negative electrode active material may adopt the negative electrode active material for soft-pack battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, the utility model is not limited to these materials, and other traditional materials that can be used as battery negative electrode film layers can also be used. These negative electrode film layers can be used alone or in combination of two or more.

[0174] In some embodiments, the negative electrode active material includes silicon, which may be present in the form of a silicon-based material, for example, the silicon-based material may include at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon compounds, silicon-nitrogen compounds, and silicon alloys. The introduction of silicon can improve the energy density of the soft-pack battery cell.

[0175] In some embodiments, the mass content of silicon in the negative electrode film layer is 1wt% to 32wt%, optionally 2wt% to 19wt%, and further optionally 6wt% to 13wt%. When the mass content of silicon is within the above range, the energy density of the soft-pack battery cell can be improved.

[0176] In the embodiments of the present utility model, the mass content of silicon in the negative electrode film layer has a well-known meaning in the art, and can be detected by using equipment and methods well-known in the art, such as immersing the negative electrode plate in a solvent such as water, separating the negative electrode active material from the negative electrode current collector, filtering to obtain the negative electrode active material, and measuring the negative electrode active material using an ICAP7400 inductively coupled plasma-emission spectrometer of Thermo Fisher Scientific, USA, with reference to GB / T30902-2014 standard to obtain the silicon content.

[0177] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The utility model embodiment has no particular restrictions on the type of negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5wt%.

[0178] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The present utility model embodiment has no particular restrictions 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, water-based acrylic resin (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%.

[0179] In some embodiments, the negative electrode film layer may further include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of the other additives in the negative electrode film layer is ≤ 2wt%.

[0180] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0181] In some embodiments, the isolation element includes an isolation membrane. The utility model has no particular limitation on the type of the isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0182] The embodiment of the utility model has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0183] In some embodiments, the material of the isolation membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0184] In some embodiments, the isolation membrane may include a porous base membrane and a coating layer disposed on at least one side of the porous base membrane, and the coating layer may include at least one of inorganic particles or organic particles.

[0185] The porous base membrane may include one or more of polyethylene and polypropylene.

[0186] The inorganic particles have good heat resistance and can improve the heat resistance of the separator as a whole. The inorganic particles will not undergo oxidation and reduction reactions with metal dendrites within the operating voltage range of the sodium ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium ion battery.

[0187] 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.

[0188] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0189] In some embodiments, the electrolyte in the battery cell includes an electrolyte salt and a solvent. The types of the electrolyte salt and the solvent are not specifically limited and can be selected according to actual needs.

[0190] In some embodiments, the electrolyte may also 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 properties, such as additives that improve battery overcharge performance, additives that improve battery high temperature performance, and additives that improve battery low temperature power performance.

[0191] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0192] In the related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment, aerospace and other fields. Batteries can be roughly divided into soft-pack batteries and hard-shell batteries according to the hardness of the shell. Soft-pack batteries have the advantages of high mass / volume energy density and good safety, making the application of soft-pack batteries more and more extensive.

[0193] When assembling multiple soft-pack battery cells into a group, the multiple soft-pack battery cells in the battery pack need to be electrically connected to form a battery pack. The electrical connection method between two adjacent soft-pack battery cells in the battery pack will also affect the energy density of the battery pack. In the related art, the connection method between two adjacent soft-pack battery cells in the battery pack is not conducive to further improving the energy density of the battery pack. Therefore, how to design the connection method between two adjacent soft-pack battery cells among the multiple soft-pack battery cells in the battery pack to further improve the energy density of the battery pack is a technical problem to be solved.

[0194] Based on this, the utility model proposes a battery pack, comprising a plurality of soft-pack battery cells electrically connected in sequence, the soft-pack battery cells comprising a shell, an electrode assembly and an electrode lead, the electrode assembly is disposed in the shell, the electrode lead is electrically connected to the electrode assembly and at least part of the electrode lead is exposed outside the shell, and the electrode leads of two adjacent soft-pack battery cells are directly connected.

[0195] In the above-mentioned battery pack, by directly connecting the electrode leads of two adjacent soft-pack battery cells in the battery pack, the electrical connection devices between the soft-pack battery cells can be omitted or reduced, the number of parts of the battery pack can be reduced, and the space occupied by the electrical connection devices can be saved, which is beneficial to improving the energy density of the battery pack. In addition, since the electrical connection devices between the soft-pack battery cells are omitted or reduced, the cost can also be reduced.

[0196] The battery device disclosed in the embodiment of the utility model can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. In addition to being used in vehicles, the battery device can also be used for, but not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecrafts, etc.

[0197] The power-consuming device disclosed in the embodiments of the utility model may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom, head or tail of the vehicle. The battery device may be used to power the vehicle, for example, the battery device may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the utility model, the battery device may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0198] Reference below Figure 1-Figure 19 A battery pack 20 , a battery device 100 , and an electric device 1000 according to an embodiment of the present invention are described.

[0199] refer to Figure 1-Figure 3 In the first aspect, the utility model provides a battery pack 20, comprising: a plurality of soft-pack battery cells 30 electrically connected in sequence, the soft-pack battery cells 30 comprising a shell 31, an electrode assembly 32 and an electrode lead 33, the electrode assembly 32 being disposed in the shell 31, the electrode lead 33 being electrically connected to the electrode assembly 32 and at least part of the electrode lead 33 being exposed outside the shell 31, and the electrode leads 33 of two adjacent soft-pack battery cells 30 being directly connected.

[0200] The outer shell 31 of the soft-pack battery cell 30 has good flexibility, and the outer shell 31 can be formed into a bag shape, and the electrode assembly 32 is accommodated in the outer shell 31, so that the soft-pack battery cell 30 is a soft-pack battery. For example, the outer shell 31 can be an aluminum-plastic film.

[0201] The electrode assembly 32 of the soft-pack battery cell 30 can be a wound electrode assembly or a laminated electrode assembly. The electrode assembly 32 includes a pole piece and a pole ear. The electrode assembly 32 can be formed by winding the pole piece, or by stacking the pole pieces. The electrode lead 33 of the soft-pack battery cell 30 is connected to the pole ear, and at least part of the electrode lead 33 is located outside the housing 31 as a lead-out structure of the electrode assembly 32. The electrode lead 33 can be used to electrically connect the soft-pack battery cell 30 with other soft-pack battery cells 30 or other components.

[0202] The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, and the portion of the electrode lead 33 exposed outside the housing 31 is defined as a lead-out portion 331. The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which actually means that the lead-out portions 331 of the two electrode leads 33 are directly connected.

[0203] The “direct connection” in the direct connection of the electrode leads 33 of two adjacent soft-pack battery cells 30 means that the electrode leads 33 of the two soft-pack battery cells 30 are directly connected without the need for an electrical connection device to achieve electrical connection between the two adjacent soft-pack battery cells 30 .

[0204] The electrical connection between two adjacent soft-pack battery cells 30 may be a series connection.

[0205] In the above technical solution, by directly connecting the electrode leads 33 of two adjacent soft-pack battery cells 30 in the battery pack 20, the electrical connection devices between the soft-pack battery cells 30 can be omitted or reduced, the number of parts of the battery pack 20 can be reduced, and the space occupied by the electrical connection devices can be saved, which is beneficial to improving the energy density of the battery pack 20. In addition, since the electrical connection devices between the soft-pack battery cells 30 are omitted or reduced, the cost can also be reduced.

[0206] In some embodiments, the electrode leads 33 of two adjacent soft-pack battery cells 30 are connected by welding.

[0207] For example, the electrode leads 33 of two adjacent soft-pack battery cells 30 may be welded together by laser welding or ultrasonic welding.

[0208] 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 achieving direct connection of the terminals of two adjacent soft-pack battery cells 30 in the battery pack 20, so that the connection method of the electrode leads 33 of two adjacent soft-pack battery cells 30 in the battery pack 20 is simple and reliable.

[0209] In some embodiments, the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected by conductive adhesive.

[0210] For example, conductive glue may be coated on one electrode lead 33 of one of two adjacent soft-pack battery cells 30, and the electrode lead 33 of the other of the two adjacent soft-pack battery cells 30 may be connected to the electrode lead 33 coated with the conductive glue; or, conductive glue may be coated on both electrode leads 33 of two adjacent soft-pack battery cells 30, and the two electrode leads 33 coated with the conductive glue may be connected via the conductive glue.

[0211] 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 conductive glue, thereby achieving direct connection of the terminals of two adjacent soft-pack battery cells 30 in the battery pack 20, so that the connection method of the electrode leads 33 of two adjacent soft-pack battery cells 30 in the battery pack 20 is simple and reliable.

[0212] In some embodiments, reference Figure 2-Figure 4 The portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331 , and the lead-out portion 331 is formed in a sheet shape.

[0213] In the above technical solution, the outer portion of the electrode lead 33 exposed from the outer shell 31 is defined as the lead-out portion 331, and the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which actually means that the lead-out portions 331 of the two electrode leads 33 are directly connected. By setting the lead-out portion 331 to a sheet shape, the connection area between the two electrode leads 33 can be made larger, thereby improving the stability and reliability of the connection between the two electrode leads 33.

[0214] In some embodiments, reference Figure 4 In the width direction of the soft-pack battery cell 30 , rounded corners 332 are formed at both ends of the lead-out portion 331 in the width direction of the soft-pack battery cell 30 .

[0215] In the length direction, width direction and thickness direction of the soft-pack battery cell 30, the size of the soft-pack battery cell 30 in the length direction of the soft-pack battery cell 30 is the largest, and the size of the soft-pack battery cell 30 in the thickness direction of the soft-pack battery cell 30 is the smallest. For example, the thickness direction of the soft-pack battery cell 30 can refer to the e1 direction in the drawings, the length direction of the soft-pack battery cell 30 can refer to the e2 direction in the drawings, and the width direction of the soft-pack battery cell 30 can refer to the e3 direction in the drawings.

[0216] In the above technical solution, by forming chamfers 332 at both ends of the lead-out portion 331 , 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 two electrode leads 33 .

[0217] In some embodiments, the portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331 , and the lead-out portion 331 is a flexible structure.

[0218] The flexible structure refers to a structure that is flexible or elastic and can be deformed.

[0219] In the above technical solution, the electrode leads 33 exposed outside the outer shell 31 are defined as the lead-out portion 331, and the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected. In fact, 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. In this way, the lead-out portion 331 can be bent into a set shape or not bent as needed, so that the connection of the lead-out portions 331 of the two electrode leads 33 is more flexible, and the arrangement of multiple soft-pack battery cells 30 in the battery pack 20 is more flexible.

[0220] In some embodiments, reference Figure 4-Figure 6The portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331 , and the thickness of the lead-out portion 331 is 0.1 mm to 0.5 mm.

[0221] For example, refer to Figure 6 The thickness of the lead-out portion 331 is d1, and the range of d1 is 0.1 mm to 0.5 mm. For example, d1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0222] The thickness direction of the lead-out portion 331 may be consistent with the thickness direction of the soft-pack battery cell 30 .

[0223] In the above technical solution, the outer portion of the electrode lead 33 exposed in the outer shell 31 is defined as the lead-out portion 331, and the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected. In fact, 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 0.1 mm to 0.5 mm, the thickness of the lead-out portion 331 can better meet the demand for excessive current, and the structural strength of the lead-out portion 331 can meet the demand. In addition, the lead-out portion 331 can also have good flexibility, so as to reduce the process difficulty of the lead-out bending and deformation when the lead-out portion 331 needs to be bent and deformed.

[0224] In some embodiments, reference Figure 2-Figure 4 The portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331 , and the width of the lead-out portion 331 in the width direction of the soft-pack battery cell 30 is 20 mm to 60 mm.

[0225] For example, refer to Figure 4 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.

[0226] In the above technical solution, by defining the outer portion of the electrode lead 33 exposed from the outer shell 31 as the lead-out portion 331, the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which actually means that the lead-out portions 331 of the two electrode leads 33 are directly connected, and by setting the width dimension of the lead-out portion 331 in the width direction of the soft-pack battery cell 30 to 20 mm to 60 mm, the width dimension of the lead-out portion 331 can better meet the excessive current demand, and the connection area of ​​the two electrode leads 33 can be larger, thereby improving the stability and reliability of the connection of the two electrode leads 33.

[0227] In some embodiments, reference Figure 2-Figure 4The portion of the electrode lead 33 exposed outside the housing 31 is a 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 10 mm to 50 mm.

[0228] For example, refer to Figure 4 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.

[0229] In the above technical solution, by defining the outer portion of the electrode lead 33 exposed from the outer shell 31 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 case that the lead-out portions 331 of the two electrode leads 33 are directly connected, and by setting the length dimension of the lead-out portion 331 in the length direction of the soft-pack battery cell 30 to 10 mm to 50 mm, the width dimension of the lead-out portion 331 can better meet the excessive current demand, and the connection area of ​​the two electrode leads 33 can be larger, thereby improving the stability and reliability of the connection of the two electrode leads 33.

[0230] In some embodiments, the portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331 , and the lead-out portion 331 is aluminum foil or copper foil.

[0231] In the above technical solution, the electrode leads 33 exposed outside the outer shell 31 are defined as the lead-out portion 331, and the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected. In fact, 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 process difficulty of the lead-out bending and deformation when the lead-out portion 331 needs to be bent and deformed.

[0232] In some embodiments, reference Figure 3-Figure 6 The portion of the electrode lead 33 exposed outside the outer shell 31 is the lead-out portion 331, and the lead-out portion 331 includes a connecting section 333. The connecting sections 333 of two directly connected electrode leads 33 are overlapped and connected, and the ratio of the length dimension of the connecting section 333 in the length direction of the soft-pack battery cell 30 to the dimension of the lead-out portion 331 in the length direction of the soft-pack battery cell 30 is 1 / 4 to 1 / 2.

[0233] The connection segments 333 of two directly connected electrode leads 33 overlap, which means that the connection segments 333 of two directly connected electrode leads 33 overlap in the thickness direction of the lead-out portion 331 and are connected at the overlapping position, for example, are welded at the overlapping position.

[0234] The definition of the length dimension of the connecting section 333 in the length direction of the soft-pack battery cell 30 includes the following cases: Case 1, when the extension direction of the connecting section 333 is consistent with the length direction of the soft-pack battery cell 30, the length dimension of the connecting section 333 in the length direction of the soft-pack 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 section 333 is inconsistent with the length direction of the soft-pack battery cell 30, the lead-out portion 331 is restored to an unbent state, thereby measuring the length dimension of the connecting section 333 in the length direction of the soft-pack battery cell 30.

[0235] For example, refer to Figure 3-Figure 6 The length dimension of the connecting section 333 in the length direction of the soft-pack battery cell 30 is L2, the length dimension of the lead-out portion 331 in the length direction of the soft-pack battery cell 30 is L1, and 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.

[0236] In the above technical solution, the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected by defining the outer portion of the electrode lead 33 exposed to the outer shell 31 as the lead-out portion 331. In fact, the lead-out portions 331 of the two electrode leads 33 are directly connected. By making the ratio of the length dimension of the overlapping portion of the two lead-out portions 331 in the length direction of the soft-pack battery cell 30 to the dimension of the lead-out portion 331 in the length direction of the soft-pack battery cell 30 be 1 / 4 to 1 / 2, the overlapping connection length of the two electrode leads 33 can be made larger, thereby improving the stability and reliability of the connection of the two electrode leads 33. In addition, a part of the lead-out portion 331 can be reserved so that the overlapping connection portion 22 of the two electrode leads 33 is separated from the outer shell 31, thereby facilitating the direct connection operation of the two electrode leads 33.

[0237] In some embodiments, reference Figure 2-Figure 4 The two electrode leads 33 of the soft-pack battery cell 30 are located at opposite sides of the length direction of the soft-pack battery cell 30 .

[0238] One of the two electrode leads 33 of the soft-pack battery cell 30 is a positive electrode lead 33, and one of the two electrode leads 33 of the soft-pack battery cell 30 is a negative electrode lead 33. One of the two electrode leads 33 of the soft-pack battery cell 30 is arranged on one side in the length direction of the soft-pack battery cell 30, and the other of the two electrode leads 33 of the soft-pack battery cell 30 is arranged on the other side in the length direction of the soft-pack battery cell 30.

[0239] When the two electrode leads 33 of the soft-pack battery cell 30 are located on opposite sides of the length direction of the soft-pack battery cell 30, two adjacent soft-pack battery cells 30 can be connected in series, and multiple soft-pack battery cells 30 in the battery pack 20 can also be connected in series in sequence.

[0240] In the above technical solution, by locating the two electrode leads 33 of the soft-pack battery cell 30 at the opposite sides in the length direction of the soft-pack battery cell 30, when the multiple soft-pack battery cells 30 are electrically connected in sequence, the multiple soft-pack battery cells 30 can be connected into a long string, and the number of soft-pack battery cells 30 in the battery pack 20 is less restricted. It is possible to realize a battery pack 20 with a small number of soft-pack battery cells 30 or a battery pack 20 with a large number of soft-pack battery cells 30, so that the number of soft-pack battery cells 30 in the battery pack 20 can be set more flexibly.

[0241] In some embodiments, reference Figure 2-Figure 4 The portion of the electrode lead 33 exposed outside the outer shell 31 is the lead-out portion 331, and the middle position in the width direction of the soft-pack battery cell 30 is the middle position of the width. In the width direction of the soft-pack battery cell 30, the lead-out portion 331 is located on one side of the middle position of the width to form an avoidance space 34 on one side of the lead-out portion 331 close to the middle position of the width.

[0242] For example, the middle position of the soft pack battery cell 30 in the width direction can be referred to as Figure 4 For example, when the battery pack 20 is installed in the box body 10, when the width direction of the soft-pack battery cell 30 is arranged along the up-down direction, the lead-out portion 331 of the soft-pack battery cell 30 can be located at the lower end or the upper end of the soft-pack battery cell 30, so that the above-mentioned avoidance space 34 can be formed on the upper side or the lower side of the lead-out portion 331.

[0243] In the above technical solution, by defining the outer portion of the electrode lead 33 exposed from the outer shell 31 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 case that the lead-out portions 331 of the two electrode leads 33 are directly connected, and by arranging the lead-out portion 331 on one side of the middle position in the width direction of the soft-pack battery cell 30, an avoidance space 34 can be formed on one side of the lead-out portion 331 close to the middle position of the width. The avoidance space 34 can make room for the arrangement of other structures, thereby improving the compactness of the overall structure of the battery pack 20, which is beneficial to improving the energy density of the battery pack 20.

[0244] In some embodiments, the plurality of soft-pack battery cells 30 of the battery pack 20 are sequentially connected in series.

[0245] In the above technical solution, by sequentially connecting the plurality of soft-pack battery cells 30 in the battery pack 20 in series, the output voltage of the battery pack 20 can be made higher.

[0246] In some embodiments, the battery pack 20 includes a thermal management component, which is disposed on at least one side of the soft-pack battery cell 30 in the thickness direction and is thermally connected to the soft-pack battery cell 30 for heat exchange with the soft-pack battery cell 30 .

[0247] The thermal management component is disposed on at least one side in the thickness direction of the soft-pack battery cell 30. For example, the thermal management component can be disposed on one side in the thickness direction of the soft-pack battery cell 30, or the thermal management component can be disposed on both sides in the thickness direction of the soft-pack battery cell 30. The thermal management component and the soft-pack battery cell 30 can be connected by thermal conductive adhesive, thereby achieving thermal conductive connection between the thermal management component and the soft-pack battery cell 30.

[0248] The thermal management component can increase the temperature of the soft-pack battery cell 30 or reduce the temperature of the soft-pack battery cell 30. For example, a heat exchange channel 43 can be formed in the thermal management component, and the heat exchange channel 43 is used for the flow of a heat exchange medium. The heat exchange medium can transfer heat to the soft-pack battery cell 30 or absorb the heat generated by the soft-pack battery cell 30, thereby adjusting the temperature of the soft-pack battery cell 30.

[0249] In the above technical solution, by providing a thermal management component and making the thermal management component located on at least one side in the thickness direction of the soft-pack battery cell 30, the temperature of the soft-pack battery cell 30 can be regulated by heat exchange between the thermal management component and the soft-pack battery cell 30, and the temperature of the soft-pack battery cell 30 can be adjusted to an appropriate range.

[0250] In some embodiments, reference Figure 1 and Figure 2, all the soft-pack battery cells 30 in the battery pack 20 are arranged along the length direction of the soft-pack battery cells 30 .

[0251] For example, the two electrode leads 33 of the soft-pack battery cell 30 are located on both sides of the length direction of the soft-pack battery cell 30, and the positive electrode lead 33 of one of the two adjacent soft-pack battery cells 30 in the battery pack 20 is directly connected to the negative electrode lead 33 of the other soft-pack battery cell 30 in the two adjacent soft-pack battery cells 30, so that all the soft-pack battery cells 30 in the battery pack 20 can be arranged along the length direction of the soft-pack battery cells 30.

[0252] In the above technical solution, by arranging all the soft-pack battery cells 30 of the battery pack 20 along the length direction of the soft-pack battery cells 30, the arrangement of the multiple soft-pack battery cells 30 of the battery pack 20 can be relatively simple, and the process of assembling the multiple soft-pack battery cells 30 to form the battery pack 20 can be relatively simple.

[0253] In some embodiments, reference Figure 5-Figure 8 All the soft-pack battery cells 30 in the battery pack 20 are divided into multiple sub-battery groups 21, and the multiple sub-battery groups 21 are arranged along the thickness direction of the soft-pack battery cells 30. Each sub-battery group 21 includes one soft-pack battery cell 30 or includes multiple soft-pack battery cells 30 arranged along the length direction of the soft-pack battery cell 30.

[0254] In the above technical solution, by dividing the multiple soft-pack battery cells 30 of the battery pack 20 into sub-battery groups 21 arranged along the thickness direction of the soft-pack battery cells 30, the overall arrangement structure of the battery pack 20 can be made compact, and the arrangement method of the multiple soft-pack battery cells 30 in the battery pack 20 can be set as needed, which also makes the arrangement method of the multiple soft-pack battery cells 30 in the battery pack 20 more flexible.

[0255] In some embodiments, reference Figure 5-Figure 8 The portion of the electrode lead 33 exposed outside the housing 31 is a lead-out portion 331, and the lead-out portions 331 of two directly connected electrode leads 33 in two adjacent sub-battery groups 21 are connected and jointly form a connecting portion 22, and at least a portion of the connecting portion 22 is curved.

[0256] At least part of the connection portion 22 is bent, which means that the connection portion 22 extends in a non-linear manner as a whole. For example, when the lead-out portions 331 of the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected to form the connection portion 22, before the connection portion 22 is bent or curved, the connection portion 22 may extend in a straight line as a whole. For example, the connection portion 22 may extend in a straight line in the length direction of the soft-pack battery cell 30 as a whole. After the connection portion 22 is bent or curved, the connection portion 22 extends in a non-linear manner as a whole. For example, the connection portion 22 may be "U"-shaped or "C"-shaped.

[0257] In the above technical solution, the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected by defining the outer portion of the electrode lead 33 exposed in the outer shell 31 as the lead-out portion 331, which is actually the direct connection of the lead-out portions 331 of the two electrode leads 33. The lead-out portions 331 of the two directly connected electrode leads 33 in two adjacent battery packs 20 are jointly formed into a connecting portion 22, and the connecting portion 22 is set to be curved, so that the multiple sub-battery groups 21 in the battery pack 20 can be easily arranged along the thickness direction of the soft-pack battery cell 30.

[0258] In some embodiments, reference Figure 5-Figure 8 In the connection direction of two directly connected electrode leads 33, the connecting 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 line, and the straight segment 221 extends along a straight line.

[0259] Two adjacent straight segments 221 are arranged at an angle, which means that the angle between the two adjacent straight segments 221 is greater than 0 and less than 180°. Figure 6 The included 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°.

[0260] For example, refer to Figure 6 The connecting 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 the two arc segments 222 can extend along the thickness direction of the soft-pack battery cell 30, and the remaining two straight segments 221 can extend along the length direction of the soft-pack battery cell 30.

[0261] In the above technical solution, the connecting portion 22 composed of two directly connected lead-out portions 331 is set to be curved, and adjacent straight sections 221 of the connecting portion 22 are connected by arc sections 222. In this way, the structure of the connecting portion 22 with sharp corners or edges can be reduced, and the stress concentration caused by the connecting portion 22 at the sharp corners or edges can be reduced.

[0262] In some embodiments, reference Figure 5-Figure 8 The connection position of the two directly connected electrode leads 33 is located in the straight section 221.

[0263] For example, refer to Figure 6 The lead-out portion 331 of the electrode lead 33 includes a connecting segment 333. The connecting segments 333 of two directly connected electrode leads 33 are overlapped and connected in the thickness direction of the lead-out portion 331. The connecting position of the two directly connected electrode leads 33 is the overlapping and connected position of the connecting segments 333 of the two directly connected electrode leads 33.

[0264] For example, refer to Figure 6 The connecting 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 the two arc segments 222 can extend along the thickness direction of the soft-pack battery cell 30, and the remaining two straight segments 221 can extend along the length direction of the soft-pack battery cell 30. The connection position of the two directly connected electrode leads 33 can be located at the straight segment 221 extending along the length direction of the soft-pack battery cell 30.

[0265] In the above technical solution, by making the connection position of the two directly connected electrode leads 33 located at the straight segment of the connecting portion 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 influence 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.

[0266] In some embodiments, reference Figure 7-Figure 9 The battery pack 20 includes a reinforcing partition 40 , which is sandwiched between two adjacent soft-pack battery cells 30 , and the hardness of the reinforcing partition 40 is greater than the hardness of the outer shell 31 .

[0267] For example, the reinforcing partition 40 may be a metal plate, and the outer shell 31 may be an aluminum-plastic film.

[0268] The reinforcing partition 40 is sandwiched between two adjacent soft-pack battery cells 30, including the following situations: a reinforcing partition 40 is provided between some adjacent soft-pack battery cells 30, and a reinforcing partition 40 is not provided between another part of adjacent soft-pack battery cells 30; or, a reinforcing partition 40 is provided between every two adjacent soft-pack battery cells 30.

[0269] The reinforcing separator 40 may be bonded and fixed to the outer shell 31 of the soft-pack battery cell 30 .

[0270] In the above technical solution, by arranging a reinforcing partition 40 between adjacent soft-pack battery cells 30 and making the hardness of the reinforcing partition 40 greater than the hardness of the outer shell 31, it is convenient to group multiple soft-pack battery cells 30, and the overall stiffness of the battery pack 20 formed by the grouping of multiple soft-pack battery cells 30 can be improved, thereby facilitating the installation of the battery pack 20 formed by the grouping of multiple soft-pack battery cells 30 and reducing the deformation of the soft-pack battery cells 30 after grouping.

[0271] In some embodiments, reference Fig. 9 The thickness of the reinforcing partition 40 is 0.8 mm to 2.0 mm.

[0272] The thickness direction of the reinforcing separator 40 is consistent with the thickness direction of the soft-pack battery cell 30 .

[0273] For example, the thickness of the reinforcing partition 40 is d2, and the range of d2 is 0.8 mm to 2.0 mm; for example, d2 is 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, etc.

[0274] In the above technical solution, by setting the thickness of the reinforcing partition 40 to be not less than 0.8 mm, the battery pack 20 formed by the grouping of multiple soft-pack battery cells 30 by the reinforcing partition 40 can have an effective reinforcing effect. At the same time, the thickness of the reinforcing partition 40 is not more than 2.0 mm, so that the reinforcing partition 40 can reduce the space occupied by the reinforcing partition 40 while playing an effective reinforcing role, so that the battery pack 20 has a higher energy density. By setting the thickness of the reinforcing partition 40 to 0.8 mm to 2.0 mm, the overall strength and rigidity of the battery pack 20 can be effectively improved, and the overall energy density of the battery pack 20 can be higher.

[0275] In some embodiments, the reinforcing spacer 40 is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0276] In the above technical solution, by setting the reinforcing partition 40 to be an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate, the reinforcing partition 40 can have higher strength and hardness, thereby better improving the overall stiffness of the group of multiple soft-pack battery cells 30 and better reducing the deformation of the group of soft-pack battery cells 30.

[0277] In some embodiments, the reinforcing spacer 40 is a solid structure.

[0278] In the above technical solution, by setting the reinforcing partition 40 as a solid structure, the reinforcing partition 40 can have better structural strength and rigidity, and can play an effective reinforcing role when the thickness of the reinforcing partition 40 is small, which is beneficial for the battery pack 20 as a whole to have better strength and rigidity while allowing the battery pack 20 as a whole to have a higher volume energy density.

[0279] In some embodiments, reference Fig. 9 A cavity 42 is formed in the reinforcing partition 40 .

[0280] For example, refer to Fig. 9 The cavities 42 formed in the reinforcing partition 40 may be multiple and spaced apart. The multiple cavities 42 in the reinforcing partition 40 may be spaced apart along the width direction of the soft-pack battery cell 30 , and each cavity 42 may extend along the length direction of the soft-pack battery cell 30 .

[0281] In the above technical solution, by setting the cavity 42 in the reinforcing partition 40, while the reinforcing partition 40 plays a role in enhancing the overall rigidity of the soft-pack battery cells 30 after being grouped, the cavity 42 in the reinforcing partition 40 can absorb the expansion and deformation of the soft-pack battery cells 30. The cavity 42 in the reinforcing partition 40 can provide a buffer for the deformation of the adjacent soft-pack battery cells 30 and is beneficial to reducing the weight of the reinforcing partition 40.

[0282] In some embodiments, reference Fig. 9 The cavity 42 includes a heat exchange channel 43 for the flow of heat exchange medium.

[0283] When at least a portion of the cavity 42 of the reinforcing partition plate 40 is used as the heat exchange flow channel 43 , the reinforcing partition plate 40 may serve as at least a portion of a heat management component.

[0284] For example, the reinforcing partition 40 can be connected to the soft-pack battery cell 30 through a thermally conductive adhesive, so that heat exchange between the reinforcing partition 40 and the soft-pack battery cell 30 can be easily achieved. When the heat exchange medium flows through the heat exchange channel 43, the temperature of the soft-pack battery cell 30 can be adjusted, for example, the temperature of the soft-pack battery cell 30 can be increased or decreased.

[0285] In the above technical solution, at least part of the cavity 42 in the reinforced partition 40 constitutes a heat exchange channel 43. When the heat exchange medium flows through the heat exchange channel 43 in the reinforced partition 40, the heat exchange medium can exchange heat with the soft-pack battery cell 30, thereby effectively adjusting the temperature of the soft-pack battery cell 30.

[0286] In some embodiments, the soft-pack battery cell 30 is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell, and a solid-state battery cell.

[0287] For example, the soft-pack battery cell 30 may be a lithium iron phosphate battery cell; for another example, the soft-pack battery cell 30 may be a ternary lithium battery cell; for another example, the soft-pack battery cell 30 may be a solid-state battery cell.

[0288] In the above technical scheme, in the embodiment where the soft-pack battery cell 30 is a lithium iron phosphate battery cell, the safety of the soft-pack battery cell 30 can be improved and the cycle life of the soft-pack battery cell 30 can be extended; in the embodiment where the soft-pack battery cell 30 is a ternary lithium battery cell, the energy density of the soft-pack battery cell 30 can be improved and the cruising range can be improved; in the embodiment where the soft-pack battery cell 30 is a solid-state battery cell, not only the energy density can be improved, but also the safety can be improved.

[0289] In some embodiments, when the soft-pack battery cell 30 is a lithium iron phosphate battery cell, the ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material of the soft-pack battery cell 30 is 96:1-3:1-3; when the soft-pack battery cell 30 is a ternary lithium battery cell, the ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material of the soft-pack battery cell 30 is 96:2-3:1-2.

[0290] The usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent refers to the mass ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent.

[0291] The dosage ratio is 96:1-3:1-3, including the following situations: dosage ratio is 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. The dosage ratio is 96:2-3:1-2, including the following situations: dosage ratio is 96:2:1, 96:2:2, 96:3:1, 96:3:2, etc.

[0292] In the above technical scheme, in an embodiment where the soft-pack battery cell 30 is a lithium iron phosphate battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the electrochemical performance and mechanical stability of the soft-pack battery cell 30; in an embodiment where the soft-pack battery cell 30 is a ternary lithium battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the energy density and cycle life of the soft-pack battery cell 30.

[0293] Second, refer to Figure 10-13 The present invention provides a battery device 100, comprising: a box body 10 and a battery pack 20, wherein the battery pack 20 is disposed in the box body 10, and the battery pack 20 is the battery pack 20 of the first aspect of the present invention.

[0294] For example, refer to Fig.10 The box body 10 may include a bottom plate 12 and a top cover 11 . The top cover 11 is disposed on the upper end of the bottom plate 12 and defines a space for accommodating the battery pack 20 together with the bottom plate 12 . The box body 10 may protect the battery pack 20 .

[0295] In the above technical solution, the battery device 100 includes the above-mentioned battery pack 20, which can omit or reduce the electrical connection devices between the soft-pack battery cells 30, and can reduce the number of components of the battery pack 20, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the battery pack 20, thereby facilitating the improvement of the density of the battery device 100, and since the electrical connection devices between the soft-pack battery cells 30 are omitted or reduced, the cost can also be reduced.

[0296] In some embodiments, reference Figure 13-Figure 16 , there are multiple battery packs 20.

[0297] The multiple battery packs 20 may be arranged in the same direction or in different directions within the box 10 .

[0298] In the above technical solution, by including the battery device 100 in the above-mentioned plurality of battery packs 20 , the battery device 100 can have a larger capacity and the overall energy density of the battery device 100 can be higher.

[0299] In some embodiments, reference Figure 13-Figure 16 At least part of the battery pack 20 is arranged along the first direction, and the thickness direction of the soft-pack battery cells 30 is arranged along the first direction.

[0300] 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.

[0301] In the above technical solution, by arranging at least part of the multiple battery packs 20 along the thickness direction of the soft-pack battery cell 30 , the multiple battery packs 20 in the battery device 100 can be arranged more compactly, which is beneficial to improving the energy density of the battery device 100 .

[0302] In some embodiments, multiple battery packs 20 are connected in series and / or in parallel.

[0303] 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 some of the battery packs 20 are connected in series and some are connected in parallel, so that the multiple battery packs 20 form a series-parallel hybrid.

[0304] In the above technical solution, 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 connecting multiple battery packs 20 in series and parallel, the battery device 100 can have a higher output voltage and a higher output current.

[0305] In some embodiments, reference Figure 10-13 The thickness directions of the soft-pack battery cells 30 are all arranged along the first direction, the length directions of the soft-pack battery cells 30 are all arranged along the second direction, and the width directions of the soft-pack battery cells 30 are all arranged along the third direction. The first direction, the second direction and the third direction intersect with each other, and the bottom plate 12 and the top cover 11 of the box body 10 are respectively located on opposite sides of the battery pack 20 along the second direction.

[0306] For example, the first direction may refer to the e1 direction in the drawings, the second direction may refer to the e2 direction in the drawings, and the third direction may refer to the e3 direction in the drawings. The first direction, the second direction, and the third direction may be arranged perpendicularly to each other.

[0307] For example, when the third direction is the up-down direction, the bottom plate 12 is located at the lower side of the battery pack 20 , and the top cover 11 is located at the upper side of the battery pack 20 .

[0308] In the above technical solution, by arranging the thickness directions of the multiple soft-pack battery cells 30 along the first direction, the length directions of the multiple soft-pack battery cells 30 along the second direction, and the width directions of the multiple soft-pack battery cells 30 along the third direction, and by arranging the bottom plate 12 and the top cover 11 of the box body 10 on both sides of the second direction of the battery pack 20 respectively, the multiple soft-pack battery cells 30 in the battery device 100 can be arranged more compactly and in a simple manner, so that the multiple soft-pack battery cells 30 can be conveniently assembled into the box body 10 after being grouped.

[0309] In some embodiments, reference Fig.12 and Fig.13 The box body 10 has a receiving cavity 13 for receiving the battery pack 20. The box body 10 is provided with a restraining member 14 extending along a first direction. Both ends of the restraining member 14 in the length direction are respectively connected to two side walls of the receiving cavity 13 along the first direction.

[0310] The two ends of the restraint 14 in the length direction are respectively connected to the two side walls of the accommodating cavity 13 along the first direction, which means: one end of the restraint 14 in the length direction is connected to one side wall of the accommodating cavity 13 along the first direction, and the other end of the restraint 14 in the length direction is connected to the other side wall of the accommodating cavity 13 along the first direction.

[0311] For example, there may be one accommodating cavity 13 in the box body 10, or there may be multiple accommodating cavities 13 arranged at intervals. Fig.13 In the example, a reinforcing beam is provided in the box 10, for example, the reinforcing beam can be provided on the bottom plate 12 of the box 10, and the reinforcing beam can improve the structural strength and rigidity of the bottom plate 12. The reinforcing beam can extend along the second direction, and the reinforcing beam divides the space in the box 10 into two accommodating chambers 13 arranged along the first direction.

[0312] When there is a accommodating cavity 13 in the box body 10, the two ends of the restraint 14 in the length direction are respectively connected to the two side walls of the box body 10 along the first direction; when the above-mentioned reinforcing beam is provided in the box body 10, one end of the restraint 14 in the length direction is connected to the side wall of the box body 10, and the other end of the restraint 14 in the length direction is connected to the reinforcing beam.

[0313] For example, in Fig.13 In the example, at least part of the battery pack 20 is arranged along the first direction, the thickness direction of the soft-pack battery cell 30 is arranged along the first direction, and the two ends of the restraint 14 in the length direction are respectively connected to the two side walls of the accommodating cavity 13 along the first direction. The restraint 14 tightens the two side walls of the accommodating cavity 13 along the first direction, so that the restraint 14 can restrain and suppress the expansion deformation of the soft-pack battery cell 30 in its thickness direction.

[0314] In the above technical solution, a restraint 14 extending along the thickness direction of the soft-pack battery cell 30 is provided in the box body 10, and the two ends of the restraint 14 in the length direction are respectively connected and fixed to the box body 10, and the two side walls of the accommodating cavity 13 along the first direction are tightened by the restraint 14, so that the restraint 14 can restrain and suppress the expansion deformation of the soft-pack battery cell 30 in its thickness direction.

[0315] In some embodiments, reference Fig.13 The two ends of the restraining member 14 are connected and fixed to the box body 10 by fasteners 141 .

[0316] For example, the fastener 141 may be a bolt and nut combination.

[0317] In the above technical solution, by making the two ends of the restraint 14 and the box body 10 pass through the two ends of the fastener 141, the two ends of the restraint 14 can be more stably locked on the box body 10, so that the restraint 14 can better restrain and inhibit the expansion and deformation of the soft-pack battery cell 30 in its thickness direction.

[0318] In some embodiments, the restraining member 14 includes a restraining belt and an insulating layer. The restraining belt is a metal member, and the insulating layer is coated on the outer surface of the restraining belt.

[0319] The insulating layer may be a plastic insulating layer.

[0320] In the above technical solution, by setting the restraint 14 to include a restraint belt and an insulating layer, and making the restraint belt a metal part, the restraint 14 can have better structural strength, so that the restraint 14 can better restrain and inhibit the expansion and deformation of the soft-pack battery cell 30 in its thickness direction; and by making the outside of the restraint 14 a coated insulating layer, while making the restraint 14 use a restraint belt made of metal material to better restrain and inhibit the expansion and deformation of the soft-pack battery cell 30 in its thickness direction, it can avoid problems such as short circuits between the restraint 14 and the soft-pack battery cell 30 and other components due to electrical contact.

[0321] In some embodiments, reference Fig.14 and Fig.15 In the first direction, a reinforcing partition 40 is sandwiched between at least two adjacent soft-pack battery cells 30 , the reinforcing partition 40 is connected to the outer shell 31 , and the hardness of the reinforcing partition 40 is greater than the hardness of the outer shell 31 .

[0322] For example, the reinforcing partition 40 may be a metal plate, and the outer shell 31 may be an aluminum-plastic film.

[0323] A reinforcing partition 40 is sandwiched between at least some adjacent two soft-pack battery cells 30, including the following situations: a reinforcing partition 40 is provided between some adjacent soft-pack battery cells 30, and no reinforcing partition 40 is provided between another part of adjacent soft-pack battery cells 30; or, a reinforcing partition 40 is provided between every two adjacent soft-pack battery cells 30.

[0324] The reinforcing separator 40 may be bonded and fixed to the outer shell 31 of the soft-pack battery cell 30 .

[0325] In the above technical solution, by providing a reinforcing partition 40 between at least two adjacent soft-pack battery cells 30 and making the hardness of the reinforcing partition 40 greater than the hardness of the outer shell 31, it is convenient to group multiple soft-pack battery cells 30, and the overall stiffness of the group of multiple soft-pack battery cells 30 can be improved, thereby facilitating the installation of the multiple soft-pack battery cells 30 after grouping, and reducing the deformation of the soft-pack battery cells 30 after grouping.

[0326] In some embodiments, reference Figure 5-Figure 9 , the thickness of the reinforcing separator 40 is smaller than the thickness of the soft-pack battery cell 30 .

[0327] The thickness direction of the reinforcing separator 40 is consistent with the thickness direction of the soft-pack battery cell 30 .

[0328] For example, the thickness of the reinforcing partition 40 is d2, the thickness of the soft pack battery cell 30 is d3, and d2 is less than d3. For example, the range of d2 is 0.8 mm to 2.0 mm; for example, d2 is 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, etc.

[0329] In the above technical solution, by making the thickness of the reinforcing partition 40 smaller than the thickness of the soft-pack battery cell 30, while improving the overall stiffness of the group of multiple soft-pack battery cells 30, the space occupied by the reinforcing partition 40 can be reduced, especially the space occupied by the reinforcing partition 40 in the thickness direction of the soft-pack battery cell 30 can be reduced, so that the overall energy density of the battery device 100 is higher.

[0330] In some embodiments, the reinforcing spacer 40 is a metal plate.

[0331] For example, the reinforcing spacer 40 may be an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0332] In the above technical solution, by setting the reinforcing partition 40 as a metal plate, the reinforcing partition 40 can have higher strength and hardness, thereby better improving the overall rigidity of the group of multiple soft-pack battery cells 30 and better reducing the deformation of the group of soft-pack battery cells 30.

[0333] In some embodiments, the reinforcing partition 40 is a heat conductive member and is thermally connected to the housing 31 .

[0334] For example, the reinforcing partition 40 and the housing 31 can be thermally connected by a thermally conductive adhesive. Since the reinforcing partition 40 is a thermally conductive member, the reinforcing partition 40 can transfer heat to the soft-pack battery cell 30 or absorb the heat generated by the soft-pack battery cell 30, thereby adjusting the temperature of the soft-pack battery cell 30.

[0335] In the above technical solution, by setting the reinforcing partition 40 as a heat conductor and thermally connecting it to the shell 31, the reinforcing partition 40 can enhance the overall stiffness of the soft-pack battery cells 30 after being grouped, and at the same time, the reinforcing partition 40 can have a thermal management function. Through the heat exchange between the reinforcing partition 40 and the 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 work within a suitable temperature range.

[0336] In some embodiments, the reinforcing spacer 40 is a solid structure.

[0337] In the above technical solution, by setting the reinforcing partition 40 as a solid structure, the reinforcing partition 40 can have better structural strength and rigidity, and can play an effective reinforcing role when the thickness of the reinforcing partition 40 is small, which is beneficial for the battery pack 20 as a whole to have better strength and rigidity while allowing the battery pack 20 as a whole to have a higher volume energy density.

[0338] In some embodiments, reference Fig. 9 A cavity 42 is formed in the reinforcing partition 40 .

[0339] For example, refer to Fig. 9 The cavities 42 formed in the reinforcing partition 40 may be multiple and spaced apart. The multiple cavities 42 in the reinforcing partition 40 may be spaced apart along the width direction of the soft-pack battery cell 30 , and each cavity 42 may extend along the length direction of the soft-pack battery cell 30 .

[0340] In the above technical solution, by setting the cavity 42 in the reinforcing partition 40, while the reinforcing partition 40 plays a role in enhancing the overall rigidity of the soft-pack battery cells 30 after being grouped, the cavity 42 in the reinforcing partition 40 can absorb the expansion and deformation of the soft-pack battery cells 30. The cavity 42 in the reinforcing partition 40 can provide a buffer for the deformation of the adjacent soft-pack battery cells 30 and is beneficial to reducing the weight of the reinforcing partition 40.

[0341] In some embodiments, reference Fig. 9 The cavity 42 includes a heat exchange channel 43 for the flow of heat exchange medium.

[0342] In the above technical solution, at least part of the cavity 42 in the reinforced partition 40 constitutes a heat exchange channel 43. When the heat exchange medium flows through the heat exchange channel 43 in the reinforced partition 40, the heat exchange medium can exchange heat with the soft-pack battery cell 30, thereby effectively adjusting the temperature of the soft-pack battery cell 30.

[0343] When at least a portion of the cavity 42 of the reinforcing partition plate 40 is used as the heat exchange flow channel 43 , the reinforcing partition plate 40 may serve as at least a portion of a heat management component.

[0344] For example, the reinforcing partition 40 can be connected to the soft-pack battery cell 30 through a thermally conductive adhesive, so that heat exchange between the reinforcing partition 40 and the soft-pack battery cell 30 can be easily achieved. When the heat exchange medium flows through the heat exchange channel 43, the temperature of the soft-pack battery cell 30 can be adjusted, for example, the temperature of the soft-pack battery cell 30 can be increased or decreased.

[0345] In some embodiments, reference Figure 8A buffer layer 50 is sandwiched between at least some of the adjacent two soft-pack battery cells 30 , and the hardness of the buffer layer 50 is less than the hardness of the outer shell 31 .

[0346] A buffer layer 50 is sandwiched between at least some adjacent two soft-pack battery cells 30 , and may be sandwiched between some adjacent two soft-pack battery cells 30 , or may be sandwiched between every two adjacent soft-pack battery cells 30 .

[0347] In the above technical solution, by providing a buffer layer 50 between at least part of two adjacent soft-pack battery cells 30 and the hardness of the buffer layer 50 is less than the hardness 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 a buffer for the deformation of the adjacent soft-pack battery cells 30.

[0348] In some embodiments, the buffer layer 50 is a foam layer or a silicone layer.

[0349] In the above technical solution, by setting a reinforcing partition 40 between at least part of adjacent soft-pack battery cells 30 to strengthen 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 and deformation of the soft-pack battery cells 30, and the foam layer or the silicone layer is light in weight, which is beneficial to reducing the overall weight of the battery device 100.

[0350] In some embodiments, reference Figure 7 and Figure 8 , the buffer layers 50 and the reinforcing partitions 40 are alternately arranged along the first direction.

[0351] In the above technical solution, by alternately arranging the buffer layer 50 and the reinforcing partition 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 evenly, and the expansion deformation of the multiple soft-pack battery cells 30 along the thickness direction can be better buffered and absorbed.

[0352] In some embodiments, reference Figure 13-Figure 17 The electrode leads 33 are located on opposite sides of the soft-pack battery cell 30 along the second direction, the second direction intersects with the first direction, and along the second direction and in the direction close to the side wall of the box body 10, the end of the reinforcing partition 40 protrudes from the outer shell 31 of the soft-pack battery cell 30 to form a fixed end 41, and the fixed end 41 is connected to the box body 10.

[0353] One of the two electrode leads 33 of the soft-pack battery cell 30 is a positive electrode lead 33, and one of the two electrode leads 33 of the soft-pack battery cell 30 is a negative electrode lead 33. One of the two electrode leads 33 of the soft-pack battery cell 30 is disposed on one side of the soft-pack battery cell 30 along the second direction, and the other of the two electrode leads 33 of the soft-pack battery cell 30 is disposed on the other side of the soft-pack battery cell 30 along the second direction.

[0354] When the cavity 42 is formed in the reinforcing partition plate 40 , the cavity 42 may not extend to the fixing end 41 , that is, the fixing end 41 of the reinforcing partition plate 40 may be a solid structure.

[0355] In the above technical solution, by making the end of the reinforcing partition 40 along the second direction protrude from the outer shell 31 of the soft-pack battery cell 30 and connected to the box body 10, since the reinforcing partition 40 is sandwiched between multiple soft-pack battery cells 30 and is grouped with multiple soft-pack battery cells 30 to form a battery pack 20, the battery pack 20 can be connected and fixed to the side wall of the box body 10. Since the hardness of the reinforcing partition 40 is generally greater than the outer shell 31 of the soft-pack battery cell 30, the connection between the battery pack 20 and the box body 10 can be made more reliable, thereby improving the installation reliability and stability of the battery pack 20 in the box body 10.

[0356] In some embodiments, reference Fig.17 The fixed end 41 and the electrode lead 33 located on the same side in the second direction are arranged along the third direction, and the first direction, the second direction and the third direction intersect each other.

[0357] The width dimension of the fixed end 41 of the reinforcing partition plate 40 in the third direction may be smaller than the width dimension of the other parts of the reinforcing partition plate 40 in the third direction.

[0358] For example, when the third direction is the up-and-down direction, the fixed end 41 of the reinforcing spacer 40 may be located above the electrode lead 33 located on the same side in the second direction.

[0359] In the above technical solution, by arranging the fixed end 41 of the reinforcing partition 40 and the electrode lead 33 located on the same side in the second direction along the third direction, the space along the third direction in the box body 10 can be fully utilized to arrange the fixed end 41 of the reinforcing partition 40 and the electrode lead 33, and the fixed end 41 of the reinforcing partition 40 and the electrode lead 33 located on the same side in the second direction can be better avoided from contacting or interfering with each other due to the close distance, so that the space in the box body 10 is fully utilized, and the structural layout in the battery device 100 is relatively compact, which is beneficial to improving the energy density of the battery device 100.

[0360] In some embodiments, reference Fig.16 and Fig.17 A mounting bracket 15 is disposed in the box body 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 box body 10 . The fixed end 41 is connected to the mounting bracket 15 .

[0361] 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 may be located on both sides of the battery pack 20 along the second direction.

[0362] For example, the mounting bracket 15 may include a plurality of sub-mounting brackets 151, and the plurality of sub-mounting brackets 151 of the mounting bracket 15 may be arranged along the first direction, and two adjacent sub-mounting brackets 151 may be connected. The plurality of sub-mounting brackets 151 may be formed independently, for example, two adjacent sub-mounting brackets 151 may be connected by welding or by structural adhesive or by fasteners 141; or, the plurality of sub-mounting brackets 151 may be formed integrally. A single sub-mounting bracket 151 may correspond to one reinforcing partition 40, or may correspond to a plurality of reinforcing partitions 40.

[0363] In the above technical solution, by arranging a mounting bracket 15 in the box body 10 and connecting the reinforcing partition 40 of the battery pack 20 to the box body 10 through the mounting bracket 15, the stability and reliability of the connection between the reinforcing partition 40 and the box body 10 can be further improved, and the overall rigidity and strength of the battery device 100 can be higher.

[0364] In some embodiments, reference Fig.16 and Fig.17 The height dimension of the mounting bracket 15 in the third direction is smaller than the width dimension of the soft-pack battery 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, and the first direction, the second direction and the third direction intersect each other.

[0365] For example, refer to Fig.17 The height dimension of the mounting bracket 15 in the third direction is h, the width dimension of the soft-pack battery cell 30 in the third direction is W2, and h is smaller than W2.

[0366] For example, when the third direction is the up-down direction, the mounting bracket 15 may be located at the lower portion of the soft-pack battery cell 30 , so that an arrangement space 16 may be formed above the mounting bracket 15 , and the arrangement space 16 may be used to arrange the wiring structure of the battery pack 20 .

[0367] 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. The arrangement space 16 can be used to arrange the wiring structure of the battery pack 20, thereby making the wiring structure layout of the battery pack 20 simpler and making full use of the space along the third direction in the box body 10, so that the structural layout in the battery device 100 is more compact, which is beneficial to improving the energy density of the battery device 100.

[0368] In some embodiments, reference Fig.18 At least part of the soft-pack battery cells 30 are arranged along the thickness direction of the soft-pack battery cells 30, a rubber barrier strip is provided in the box body 10, and the outer surface of the outer shell 31 includes adjacent shell bottom surfaces 311 and shell side surfaces 312, the shell bottom surface 311 is located on the lower side of the outer shell 31, and the shell side surfaces 312 are located on both sides of the thickness direction of the soft-pack battery cells 30, and a chamfered portion 313 is formed at the connection between the shell bottom surface 311 and the shell side surfaces 312, and the box body 10 includes a bottom plate 12, and the shell bottom surface 311 and the bottom plate 12 are connected by an adhesive layer 36, and the rubber barrier strip 35 is located on the outer peripheral side of the shell bottom surface 311 and at least part of the rubber barrier strip 35 is located between the chamfered portion 313 and the bottom plate 12.

[0369] For example, the thickness direction of the soft pack battery cell 30 can refer to Fig.18 The e1 direction in the above figure can be referred to as Fig.18 The e3 direction in .

[0370] At least some of the soft-pack battery cells 30 are arranged along the thickness direction of the soft-pack battery cells 30 , which may include the following situations: some of the soft-pack battery cells 30 are arranged along the thickness direction of the soft-pack battery cells 30 , or all of the soft-pack battery cells 30 are arranged along the thickness direction of the soft-pack battery cells 30 .

[0371] The shell bottom surface 311 of the soft-pack battery cell 30 faces the bottom plate 12 , and the shell side surfaces 312 of two adjacent soft-pack battery cells 30 are arranged to face each other in the thickness direction of the soft-pack battery cell 30 .

[0372] A single soft-pack battery cell 30 has two shell side surfaces 312 , and a chamfered portion 313 is formed at the connection between each shell side surface 312 and the shell bottom surface 311 , and the chamfered portion 313 may be a rounded corner.

[0373] The rubber blocking strip 35 may extend along the length direction of the soft-pack battery cell 30 . In the length direction of the soft-pack battery cell 30 , the length of the rubber blocking strip 35 may be substantially consistent with the length of the soft-pack battery cell 30 .

[0374] At least part of the rubber strip 35 is located between the chamfered portion 313 and the bottom plate 12 , which may include the following situations: part of the rubber strip 35 is located between the chamfered portion 313 and the bottom plate 12 , or the entire rubber strip 35 is located between the chamfered portion 313 and the bottom plate 12 .

[0375] In the above technical solution, by setting a rubber barrier strip 35 at the chamfer at the bottom of the soft-pack battery cell 30 and the rubber barrier strip 35 is located between the chamfer 313 at the bottom of the soft-pack battery cell 30 and the bottom plate 12, when the shell bottom surface 311 of the soft-pack battery cell 30 is fixedly connected to the bottom plate 12 of the box body 10 through the adhesive layer 36, the set rubber barrier strip 35 can prevent the structural adhesive forming the above-mentioned adhesive layer 36 from overflowing into the gap between adjacent soft-pack battery cells 30, reducing the probability of forming a hard structure in the gap between adjacent soft-pack battery cells 30 due to overflowing glue, 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 cells 30.

[0376] In some embodiments, reference Fig.18 In the thickness direction of the soft-pack battery cells 30 , two adjacent soft-pack battery cells 30 share a rubber barrier strip 35 .

[0377] Two adjacent soft-pack battery cells 30 share a common blocking strip 35, and part of the common blocking strip 35 is located between the chamfered portion 313 of one of the soft-pack battery cells 30 and the bottom plate 12, and part of the common blocking strip 35 is located between the chamfered portion 313 of the other soft-pack battery cell 30 and the bottom plate 12, and part of the common blocking strip 35 is located in the gap between the two adjacent soft-pack battery cells 30.

[0378] In the above technical solution, by making two adjacent soft-pack battery cells 30 share a common rubber barrier strip 35, the two soft-pack battery cells 30 can block the structural adhesive forming the above-mentioned adhesive layer 36 from overflowing into the gap between the adjacent soft-pack battery cells 30 through the common rubber barrier strip 35, so the number of rubber barrier strips 35 to be set can be reduced, thereby reducing the number of rubber barrier strips 35 that need to be assembled, which is beneficial to reducing the assembly time of the battery device 100.

[0379] In some embodiments, the rubber blocking strip 35 is a rubber blocking foam, and the rubber blocking strip 35 is bonded to the bottom plate 12 ; or, the rubber blocking strip 35 is a rubber strip with adhesive on one side, and the rubber blocking strip 35 is bonded to the chamfered portion 313 .

[0380] In the above technical solution, by making the blocking strip 35 into a blocking foam with good compressibility, the blocking strip 35 is squeezed by the soft-pack battery cell 30, so that the gap between the bottom surface 311 of the shell of the soft-pack battery cell 30 and the adjacent two soft-pack battery cells 30 can be better separated by the blocking strip 35, so as to better prevent the adhesive layer 36 located on the bottom surface of the soft-pack battery cell 30 from overflowing into the gap between the adjacent two soft-pack battery cells 30, and the blocking strip 35 is bonded to the bottom plate 12, so as to facilitate the installation and fixation of the blocking strip 35; or, by making the blocking strip 35 into a strip with adhesive on one side, the blocking strip 35 is bonded to the chamfered portion 313, so as to facilitate the bonding and fixation of the blocking strip 35 to the chamfered portion 313 of the soft-pack battery cell 30, so that the blocking strip 35 and the soft-pack battery cell 30 are fixed as a whole, so as to facilitate the subsequent fixing of the soft-pack battery cell 30 to the bottom plate 12 of the box body 10 through the adhesive layer 36.

[0381] Thirdly, refer to Fig.19 The utility model provides an electrical device 1000, comprising: a battery device 100 according to the second aspect of the utility model.

[0382] The electric device 1000 may be a vehicle, and the battery device 100 may be installed at the bottom of the vehicle body 200 .

[0383] In the above technical solution, the electrical device 1000 includes the above battery device 100 . The battery device 100 has a relatively high energy density, which is beneficial to improving the overall performance of the electrical device 1000 .

[0384] Refer to the following Figure 1-Figure 6 A battery pack 20 according to various embodiments of the present invention is described.

[0385] Reference Figure 1-Figure 4 In some embodiments of the present invention, the battery pack 20 includes: a plurality of soft-pack battery cells 30 electrically connected in sequence.

[0386] The soft-pack battery cell 30 includes a shell 31, an electrode assembly 32 and an electrode lead 33. The electrode assembly 32 is arranged in the shell 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 shell 31, and the portion of the electrode lead 33 exposed outside the shell 31 is a lead-out portion 331. The lead-out portion 331 is formed in a sheet shape. In the width direction of the soft-pack battery cell 30, the lead-out portion 331 is formed with chamfered corners 332 at both ends of the width direction of the soft-pack battery cell 30. In the width direction of the soft-pack battery cell 30, the lead-out portion 331 is located on one side of the middle position of the width to form an avoidance space 34 on one side of the lead-out portion 331 close to the middle position of the width.

[0387] The two electrode leads 33 of the soft-pack battery cell 30 are located on both sides of the soft-pack battery cell 30 along the length direction of the soft-pack battery cell 30. The positive electrode lead 33 of one of the two adjacent soft-pack battery cells 30 in the battery pack 20 is directly connected to the negative electrode lead 33 of the other of the two adjacent soft-pack battery cells 30, and the lead-out portions 331 of the electrode leads 33 of the two adjacent soft-pack battery cells 30 are welded and connected. All the soft-pack battery cells 30 in the battery pack 20 are connected in series in sequence, and all the soft-pack battery cells 30 in the battery pack 20 are arranged along the length direction of the soft-pack battery cells 30.

[0388] Reference Figure 4-Figure 6 In some other embodiments of the present invention, the battery pack 20 includes: a plurality of soft-pack battery cells 30 electrically connected in sequence.

[0389] The soft-pack battery cell 30 includes a shell 31, an electrode assembly 32 and an electrode lead 33. The electrode assembly 32 is arranged in the shell 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 shell 31, and the portion of the electrode lead 33 exposed outside the shell 31 is a lead-out portion 331. The lead-out portion 331 is formed in a sheet shape. In the width direction of the soft-pack battery cell 30, the lead-out portion 331 is formed with chamfered corners 332 at both ends of the width direction of the soft-pack battery cell 30. In the width direction of the soft-pack battery cell 30, the lead-out portion 331 is located on one side of the middle position of the width to form an avoidance space 34 on one side of the lead-out portion 331 close to the middle position of the width.

[0390] The two electrode leads 33 of the soft-pack battery cell 30 are located on both sides of the soft-pack battery cell 30 along the length direction of the soft-pack battery cell 30. The positive electrode lead 33 of one of the two adjacent soft-pack battery cells 30 in the battery pack 20 is directly connected to the negative electrode lead 33 of the other of the two adjacent soft-pack battery cells 30. The lead-out portions 331 of the electrode leads 33 of the two adjacent soft-pack battery cells 30 are welded and connected. All the soft-pack battery cells 30 in the battery pack 20 are connected in series in sequence.

[0391] All the soft-pack battery cells 30 in the battery pack 20 are divided into a plurality of sub-battery groups 21, and the plurality of sub-battery groups 21 are arranged along the thickness direction of the soft-pack battery cells 30, and each sub-battery group 21 includes a soft-pack battery cell 30, and the lead-out portions 331 of the two electrode leads 33 directly connected in two adjacent sub-battery groups 21 are connected and jointly form a connecting portion 22, and at least a portion of the connecting portion 22 is curved. The connecting portion 22 includes three straight segments 221 connected in sequence, and an arc segment 222 is connected between two adjacent straight segments 221, and the straight segment 221 located between the two arc segments 222 can extend along the thickness direction of the soft-pack battery cell 30, and the remaining two straight segments 221 can extend along the length direction of the soft-pack battery cell 30. The lead-out portion 331 of the electrode lead 33 includes a connecting section 333. The connecting sections 333 of two directly connected electrode leads 33 are overlapped 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 overlapping and connected position of the connecting sections 333 of the two directly connected electrode leads 33. 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.

[0392] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0393] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A plurality of soft-pack battery cells are electrically connected in sequence, wherein the soft-pack battery cells include a shell, an electrode assembly and an electrode lead, the electrode assembly is disposed in the shell, the electrode lead is electrically connected to the electrode assembly and at least part of the electrode lead is exposed outside the shell, the electrode leads of two adjacent soft-pack battery cells are directly connected, the part of the electrode lead exposed outside the shell is a lead-out portion, and the lead-out portion is a flexible structure.

2. The battery pack according to claim 1, characterized in that: The electrode leads of two adjacent soft-pack battery cells are connected by welding.

3. The battery pack according to claim 1, characterized in that: The electrode leads of two adjacent soft-pack battery cells are directly connected by conductive glue.

4. The battery pack according to claim 1, characterized in that: The lead-out portion is formed in a sheet shape.

5. The battery pack according to claim 4, characterized in that: In the width direction of the soft-pack battery cell, both ends of the lead-out portion in the width direction of the soft-pack battery cell are formed with rounded corners.

6. The battery pack according to claim 1, characterized in that: The lead-out portion has a thickness of 0.1 mm to 0.5 mm.

7. The battery pack according to claim 1, characterized in that: The lead-out portion has a width dimension of 20 mm to 60 mm in a width direction of the soft-pack battery cell.

8. The battery pack according to claim 1, characterized in that: The length of the lead-out portion in the length direction of the soft-pack battery cell is 10 mm to 50 mm.

9. The battery pack according to claim 1, characterized in that: The lead-out portion is aluminum foil or copper foil.

10. The battery pack according to claim 1, characterized in that: The lead-out portion includes a connecting section, the connecting sections of the two directly connected electrode leads are overlapped and connected, and the ratio of the length dimension of the connecting section in the length direction of the soft-pack battery cell to the dimension of the lead-out portion in the length direction of the soft-pack battery cell is 1 / 4 to 1 / 2.

11. The battery pack according to claim 1, characterized in that: The two electrode leads of the soft-pack battery cell are located at opposite sides of the soft-pack battery cell in the length direction.

12. The battery pack according to claim 11, characterized in that: The middle position of the soft-pack battery cell in the width direction is the width middle position. In the width direction of the soft-pack battery cell, the lead-out portion is located on one side of the width middle position to form an avoidance space on one side of the width middle position close to the lead-out portion.

13. The battery pack according to claim 1, characterized in that: The plurality of soft-pack battery cells of the battery pack are sequentially connected in series.

14. The battery pack according to claim 1, characterized in that: A heat management component is included, and the heat management component is arranged on at least one side of the soft-pack battery cell in the thickness direction. The heat management component is thermally connected to the soft-pack battery cell to exchange heat with the soft-pack battery cell.

15. The battery pack according to any one of claims 1 to 14, characterized in that: All of the soft-pack battery cells in the battery pack are arranged along the length direction of the soft-pack battery cells.

16. The battery pack according to any one of claims 1 to 14, characterized in that: All the soft-pack battery cells in the battery pack are divided into a plurality of sub-battery groups, and the plurality of sub-battery groups are arranged along the thickness direction of the soft-pack battery cell, and each of the sub-battery groups includes one soft-pack battery cell or includes a plurality of soft-pack battery cells arranged along the length direction of the soft-pack battery cell.

17. The battery pack according to claim 16, characterized in that: The lead-out portions of two directly connected electrode leads in two adjacent sub-battery groups are connected to form a connecting portion, and at least a portion of the connecting portion is bent.

18. The battery pack according to claim 17, characterized in that: In the connection direction of the two directly connected electrode leads, the connecting 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 line, and the straight segment extends along a straight line.

19. The battery pack according to claim 18, characterized in that: The connection position of the two directly connected electrode leads is located in the straight section.

20. The battery pack according to claim 16, characterized in that: It comprises a reinforcing partition, which is sandwiched between two adjacent soft-pack battery cells, and the hardness of the reinforcing partition is greater than the hardness of the shell.

21. The battery pack according to claim 20, characterized in that: The thickness of the reinforced partition is 0.8 mm to 2.0 mm.

22. The battery pack according to claim 20, characterized in that: The reinforcing partition is an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate.

23. The battery pack according to claim 20, characterized in that: The reinforced partition is a solid structure.

24. The battery pack according to claim 20, characterized in that: A cavity is formed in the reinforced partition.

25. The battery pack according to claim 24, characterized in that: The cavity includes a heat exchange flow channel for the flow of heat exchange medium.

26. The battery pack according to any one of claims 1 to 14, characterized in that: The soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell and a solid-state battery cell.

27. A battery device, characterized in that: include: Box; A battery pack is arranged in the box, and the battery pack is the battery pack according to any one of claims 1-19.

28. The battery device according to claim 27, characterized in that The battery pack is multiple.

29. The battery device according to claim 28, characterized in that At least part of the battery pack is arranged along a first direction, and the thickness directions of the soft-pack battery cells are all arranged along the first direction.

30. The battery device according to claim 28, characterized in that A plurality of the battery packs are connected in series and / or in parallel.

31. The battery device according to claim 27, characterized in that The thickness directions of the soft-pack battery cells are all arranged along the first direction, the length directions of the soft-pack battery cells are all arranged along the second direction, and the width directions of the soft-pack battery cells are all arranged along the third direction. The first direction, the second direction and the third direction intersect each other, and the bottom plate and the top cover of the box body are respectively located on opposite sides of the battery pack along the second direction.

32. The battery device according to claim 27, characterized in that The box body has a receiving cavity for receiving the battery pack, and the box body is provided with a restraining member extending along a first direction, and two ends of the restraining member in a length direction are respectively connected to two side walls of the receiving cavity along the first direction.

33. The battery device according to claim 32, characterized in that The two ends of the restraining member are connected and fixed to the box body by fasteners.

34. The battery device according to claim 32, characterized in that The restraining member comprises a restraining belt and an insulating layer, wherein the restraining belt is a metal member, and the insulating layer is coated on the outer surface of the restraining belt.

35. The battery device according to claim 27, characterized in that In the first direction, a reinforcing partition is sandwiched between at least two adjacent soft-pack battery cells, the reinforcing partition is connected to the outer shell, and the hardness of the reinforcing partition is greater than the hardness of the outer shell.

36. The battery device according to claim 35, characterized in that The thickness of the reinforcing separator is smaller than the thickness of the soft-pack battery cell.

37. The battery device according to claim 35, characterized in that The reinforcing partition is a metal plate.

38. The battery device according to claim 35, characterized in that The reinforcing partition is a heat conducting member and is thermally connected to the housing.

39. The battery device according to claim 35, characterized in that The reinforced partition is a solid structure.

40. The battery device according to claim 35, characterized in that A cavity is formed in the reinforced partition.

41. The battery device according to claim 40, characterized in that The cavity includes a heat exchange flow channel for the flow of heat exchange medium.

42. The battery device according to claim 35, characterized in that A buffer layer is sandwiched between at least two adjacent soft-pack battery cells, and the hardness of the buffer layer is less than the hardness of the shell.

43. The battery device according to claim 42, characterized in that The buffer layer is a foam layer or a silica gel layer.

44. The battery device according to claim 42, characterized in that The buffer layers and the reinforcing partitions are alternately arranged along the first direction.

45. The battery device according to claim 35, characterized in that The electrode leads are located on opposite sides of the soft-pack battery cell along a second direction, the second direction intersects with the first direction, and along the second direction and in a direction close to the side wall of the box body, the end of the reinforcing partition protrudes from the outer shell of the soft-pack battery cell to form a fixed end, and the fixed end is connected to the box body.

46. ​​The battery device according to claim 45, characterized in that 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.

47. The battery device according to claim 45, characterized in that A mounting bracket is disposed in the box body, the mounting bracket is located on at least one side of the battery pack along the second direction and is connected to the box body, and the fixed end is connected to the mounting bracket.

48. The battery device according to claim 47, characterized in that The height dimension of the mounting bracket in the third direction is smaller than the width dimension of the soft-pack battery cell in the third direction, so as to form an arrangement space on one side of the mounting bracket along the third direction, and the first direction, the second direction and the third direction intersect each other.

49. The battery device according to any one of claims 27 to 48, characterized in that: At least part of the soft-pack battery cells are arranged along the thickness direction of the soft-pack battery cells, a rubber stop strip is provided in the box body, the outer surface of the shell includes adjacent shell bottom surfaces and shell side surfaces, the shell bottom surface is located on the lower side of the shell, and the shell side surfaces are located on both sides of the thickness direction of the soft-pack battery cells, a chamfer is formed at the connection between the shell bottom surface and the shell side surfaces, the box body includes a bottom plate, the shell bottom surface and the bottom plate are connected by an adhesive layer, the rubber stop strip is located on the outer peripheral side of the shell bottom surface and at least part of the rubber stop strip is located between the chamfer and the bottom plate.

50. The battery device according to claim 49, characterized in that In the thickness direction of the soft-pack battery cells, two adjacent soft-pack battery cells share a rubber barrier strip.

51. The battery device according to claim 49, characterized in that The rubber blocking strip is a rubber blocking foam, and the rubber blocking strip is bonded to the bottom plate; or the rubber blocking strip is a rubber strip with adhesive on one side, and the rubber blocking strip is bonded to the chamfered portion.

52. An electrical device, characterized in that: include: A battery device according to any one of claims 27 to 51.

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