Soft package battery monomer, battery device, energy storage device and power utilization device

Abstract

The utility model discloses a soft package battery monomer, a battery device, an energy storage device and a power utilization device, the soft package battery monomer comprises a membrane shell, the wall thickness of the membrane shell is less than or equal to 0.2 mm, the membrane shell comprises two membrane parts connected in a first direction, the two membrane parts define accommodating grooves, the accommodating grooves of the two membrane parts are oppositely arranged in the first direction, and the two membrane parts are oppositely arranged in the first direction; a containing cavity of the membrane shell is jointly formed; the electrode assembly is arranged in the accommodating cavity, the size of the soft package battery monomer in the first direction is a first size, the size of any membrane part in the first direction is a second size, the first size is larger than or equal to 5mm and smaller than or equal to 70mm, and the ratio of the second size to the first size is larger than or equal to 0.4 and smaller than or equal to 0.6. According to the soft package battery monomer, the energy density of the soft package battery monomer can be well improved, so that the arrangement space of the soft package battery monomer in the battery device is increased, and the overall energy density of the battery device is well improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a soft-pack battery cell and a battery device, an energy storage device and an electrical device. Background Art

[0002] With the development of science and technology, electrical devices such as vehicles have increasingly higher requirements on the capacity of battery devices. When the battery device adopts soft-pack batteries, the energy density of the soft-pack battery monomer is low, which makes the energy density of the battery device low. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a soft-pack battery cell, which can well improve the energy density, thereby well improving the overall energy density of the battery device, so that the battery device can better meet the use requirements.

[0004] The present application also provides a battery device having the above-mentioned soft-pack battery cell.

[0005] The present application also proposes an energy storage device having the above-mentioned battery device.

[0006] The present application also proposes an electrical device having the above-mentioned battery device or energy storage device.

[0007] The soft-pack battery cell according to the first aspect of the present application comprises: a membrane shell, the wall thickness of the membrane shell is less than or equal to 0.2 mm, the membrane shell comprises two membrane parts connected in a first direction, the two membrane parts each define a receiving groove, the receiving grooves of the two membrane parts are arranged opposite to each other in the first direction, and together constitute a receiving cavity of the membrane shell; an electrode assembly, the electrode assembly is arranged in the receiving cavity, wherein the size of the soft-pack battery cell in the first direction is a first size, the size of any one of the membrane parts in the first direction is a second size, the first size is greater than or equal to 5 mm and less than or equal to 70 mm, and the ratio of the second size to the first size is greater than or equal to 0.4 and less than or equal to 0.6.

[0008] According to the soft-pack battery cell of the present application, by setting the thickness of the membrane shell to be less than 0.2mm, and the first dimension to be greater than or equal to 5mm and less than or equal to 70mm, the soft-pack battery cell has a larger thickness and the wall thickness of the membrane shell is smaller, so that the soft-pack battery cell has a higher energy density. At the same time, the ratio of the second dimension to the first dimension of any membrane portion is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions of the membrane shell have similar or identical size structures and structural properties, so that the two membrane portions can have a more balanced bearing capacity for the stress generated in the accommodating cavity, etc., so that the overall structure of the membrane shell is more stable and the structural properties such as mechanical strength are better, so that the membrane shell can meet the support and protection needs of the soft-pack battery cell when the thickness is larger under the condition that the wall thickness is less than or equal to 0.2mm, so that the energy density of the soft-pack battery cell can be stably and reliably improved, thereby reducing the number of structural components such as support and heat conduction in the battery device, and increasing the arrangement space of the soft-pack battery cell in the battery device, so that the overall energy density of the battery device is greatly improved.

[0009] In some embodiments of the present application, a ratio of the second size to the first size is greater than or equal to 0.45 and less than or equal to 0.55.

[0010] In the present embodiment, by setting the ratio of the second dimension to the first dimension to be greater than or equal to 0.45 and less than or equal to 0.55, the dimensions of the two membrane portions in the first direction are made more consistent, which is convenient for processing and manufacturing, and the accommodating grooves of the two membrane portions can have a sufficient depth for the arrangement of the electrode assembly, and the two membrane portions maintain a relatively consistent mechanical strength, making the overall structure of the membrane shell more stable and reliable, so that the soft-pack battery monomer can operate and use stably and reliably.

[0011] In one embodiment of the present application, the ratio of the second size to the first size is 0.5.

[0012] In this embodiment, the ratio of the second size to the first size is set to 0.5, so that the two membrane parts can have the same structural structure, which makes the processing and forming of the membrane shell more convenient, and the two membrane parts can have consistent mechanical strength and structural performance, so that the overall structural stability and reliability of the membrane shell are better, and the operation of the soft-pack battery cell is more stable.

[0013] In some embodiments of the present application, the first size is greater than or equal to 15 mm and less than or equal to 45 mm.

[0014] In this embodiment, the first dimension is set to be greater than or equal to 15 mm and less than or equal to 45 mm, so that the soft-pack battery cell has a larger thickness, the energy density of the battery device can be greatly improved, and the probability of a decrease in the structural stability of the soft-pack battery cell caused by an excessive thickness of the soft-pack battery cell is reduced, so that the soft-pack battery cell has an appropriate thickness for stable and reliable operation.

[0015] In some embodiments of the present application, the second size is greater than or equal to 3 mm and less than or equal to 35 mm.

[0016] In this embodiment, the second size is set to be greater than or equal to 3 mm and less than or equal to 35 mm, so that the two membrane parts can cooperate to form a membrane shell of the required thickness for the soft-pack battery, meeting the setting requirements of the soft-pack battery monomer.

[0017] In one embodiment of the present application, the second size is greater than or equal to 7 mm and less than or equal to 22 mm.

[0018] In this embodiment, the second dimension is set to be greater than or equal to 7 mm and less than or equal to 22 mm, so that the membrane portion has a more suitable size in the first direction, so that the membrane portion can have good mechanical strength and structural stability, thereby making the overall structure of the membrane shell more stable and reliable, and the electrode assembly can be stably and reliably arranged in the accommodating cavity, thereby making the operation of the soft-pack battery cell more stable.

[0019] In some embodiments of the present application, the membrane portion includes: a seal edge, a side wall and a bottom wall, the seal edge and the bottom wall are arranged at intervals in the first direction, the side wall extends in a ring shape along the circumference of the bottom wall, one end of the side wall in the first direction is connected to the circumference of the bottom wall, and the other end extends along the first direction to be connected to the seal edge, the seal edge, the side wall and the bottom wall cooperate to enclose a receiving groove which is open on one side in the first direction, and at least a portion of the electrode assembly is disposed in the receiving groove.

[0020] In this embodiment, the membrane portion includes a sealing edge, a side wall and a bottom wall, and has a simple structure, which can well meet the molding requirements of the accommodating groove and the accommodating cavity, so that the processing of the membrane shell can proceed smoothly and meet the processing and manufacturing requirements of the soft-pack battery monomer.

[0021] In one embodiment of the present application, the side wall includes a first arc segment, a straight line segment, and a second arc segment connected in sequence along the first direction, the straight line segment extends in a straight line in the first direction, the straight line segment is connected to the edge sealing arc through the first arc segment, and the straight line segment is connected to the bottom wall arc through the second arc segment.

[0022] In this embodiment, a straight line segment is arranged on the side wall extending along the first direction, which can play a good guiding role in the mobile assembly of the electrode assembly and facilitate the arrangement of the electrode assembly in the receiving slot, so that the space of the receiving slot can be more fully utilized. The first arc segment and the second arc segment can cooperate with the first straight line segment to play a good guiding role, thereby reducing the probability of scratch damage when the electrode assembly is installed in the receiving slot, so that the assembled soft-pack battery cell can operate stably.

[0023] In some examples of the present application, a dimension of the straight line segment in the first direction is a third dimension, and a ratio of the third dimension to the second dimension is greater than or equal to 0.6 and less than or equal to 0.9.

[0024] In this embodiment, by setting the ratio of the third dimension of the straight line segment in the first direction to the second dimension to be greater than or equal to 0.6 and less than or equal to 0.9, the accommodating space enclosed by the side walls of the straight line segment portion in the first direction of the accommodating groove occupies a larger proportion of the accommodating groove space, so that when the electrode assembly is arranged in the accommodating groove, the space in the accommodating groove can be more fully utilized, and the arrangement of the electrode assembly and the membrane shell can be more compact, thereby further improving the energy density of the soft-pack battery cell to a certain extent.

[0025] In an example of the present application, a ratio of the third size to the second size is greater than or equal to 0.7 and less than or equal to 0.85.

[0026] In this embodiment, the ratio of the third dimension to the second dimension is set to be greater than or equal to 0.7 and less than or equal to 0.85, so that the accommodating groove has a larger accommodating space surrounded by straight line segments in the first direction so that the space of the accommodating groove can be more fully utilized, and the first arc segment and the second arc segment form a good and smooth transition section between the straight line segment and the edge seal and the bottom wall, so that the electrode assembly and the membrane shell are assembled more smoothly and conveniently.

[0027] In some examples of the present application, a dimension of the straight line segment in the first direction is a third dimension, and the third dimension is greater than or equal to 5 mm and less than or equal to 30 mm.

[0028] In this embodiment, the third dimension of the straight line segment along the first direction is set to be greater than or equal to 5 mm and less than or equal to 30 mm, which can meet the setting requirements of different thicknesses of soft-pack battery cells, so that the dimension of the membrane shell formed by the two membrane parts in the first direction can meet the thickness requirements of the battery cell.

[0029] In an example of the present application, the third dimension is greater than or equal to 7 mm and less than or equal to 18 mm.

[0030] In this embodiment, the third dimension is further limited to be greater than or equal to 7 mm and less than or equal to 18 mm, so that the thickness of the membrane shell can be within a more suitable range, thereby meeting the thickness requirements of the soft-pack battery cell.

[0031] In some examples of the present application, the radius of the first arc segment is greater than or equal to 1.5 mm, and the radius of the second arc segment is greater than or equal to 1.5 mm.

[0032] In this embodiment, the radius of the first arc segment is set to be greater than or equal to 1.5 mm, and the radius of the second arc segment is set to be greater than or equal to 1.5 mm, so that a transition arc segment of sufficient size can be formed between the straight line segment and the edge seal and between the straight line segment and the bottom wall, thereby making the connection between the straight line segment and the bottom wall and the edge seal more stable and reliable, and enabling the first arc segment and the second arc segment to play a better guiding role.

[0033] In some embodiments of the present application, the width dimension of the soft-pack battery cell in the second direction is less than or equal to 200 mm, and / or the length dimension of the soft-pack battery cell in the third direction is less than or equal to 650 mm, and the third direction intersects with the second direction and the first direction in pairs.

[0034] In this embodiment, by setting the width dimension of the soft-pack battery cell in the second direction to be less than or equal to 200 mm, and setting the length dimension of the soft-pack battery cell in the third direction to be less than or equal to 650 mm, the soft-pack battery cell can have a smaller arrangement space in the second direction while meeting the energy density requirements of the battery device and the overall structure remains stable, thereby making the battery device more convenient to arrange and more stable in operation.

[0035] In some embodiments of the present application, a sealing boss is formed on the end surface of at least one end of the membrane shell in the second direction, and the sealing boss is configured to be formed by folding the sealing edges of two membrane parts, and the second direction intersects with the first direction.

[0036] In this embodiment, a sealing boss is formed on the end surface of at least one end of the membrane shell in the second direction, which can effectively reduce the space occupied by the sealing in the second direction and the interference caused to the arrangement of the soft-pack battery monomer, so that the overall size of the soft-pack battery monomer in the second direction is smaller, which is convenient for the arrangement of the soft-pack battery monomer in the battery device. The sealing boss can improve the sealing reliability of the accommodating cavity to a certain extent, so that the soft-pack battery monomer has a more stable sealing effect.

[0037] In one embodiment of the present application, a protrusion height of the edge sealing boss in the second direction is less than or equal to 0.5 mm.

[0038] In this embodiment, the protrusion height of the edge sealing boss in the second direction is set to be less than or equal to 0.5 mm, so that the protrusion size of the edge sealing boss on the soft-pack battery cell is very small, so that the end of the soft-pack battery cell with the edge sealing boss in the second direction can still be conveniently matched with the assembly of supporting and fixing structures, making it more convenient and easy to assemble the soft-pack battery cell in the battery device.

[0039] In some embodiments of the present application, the soft-pack battery cell has conductive members at both ends in a third direction, the conductive members are electrically connected to the electrode assembly and at least partially exposed outside the membrane shell, and the third direction intersects with the first direction.

[0040] In this embodiment, conductive members are respectively provided at both ends of the soft-pack battery cell in the third direction, and the conductive members are electrically connected to the electrode assembly. The structure is simple and can well meet the use requirements of the soft-pack battery cell.

[0041] In one embodiment of the present application, the portion of the conductive member exposed outside the membrane shell is a lead-out portion, and the lead-out portion is formed in a sheet shape.

[0042] In this embodiment, the lead-out portion is configured in a sheet shape so that the lead-out portion can have a larger electrical connection surface, and the lead-out portion can be conveniently and reliably electrically connected to other electrical connectors or conductive members.

[0043] In some examples of the present application, both side end surfaces of the lead-out portion in the second direction are chamfered with an end surface of the lead-out portion at one end away from the electrode assembly in the third direction, respectively.

[0044] In this embodiment, the end faces of the lead-out part on both sides in the second direction and the end face of the lead-out part at one end away from the electrode assembly in the third direction are chamfered, which can effectively disperse the stress on the lead-out part and reduce the risk of scratches on the soft-pack battery cell and the operator due to the presence of sharp edges of the lead-out part, so that the lead-out part can be electrically connected more conveniently and stably.

[0045] In one embodiment of the present application, the portion of the conductive member exposed outside the membrane shell is a lead-out portion, and the lead-out portion is a flexible structure.

[0046] In this embodiment, the lead-out portion is set as a flexible structure, which can make the lead-out portion more convenient for electrical connection and enable the lead-out portion to better adapt to the electrical connection needs at different angles and directions, thereby making the soft-pack battery cell more convenient and reliable when electrically connected to other soft-pack battery cells or external circuits.

[0047] In one embodiment of the present application, the portion of the conductive member exposed outside the membrane shell is a lead-out portion, and the thickness of the lead-out portion is 0.1 mm to 0.5 mm.

[0048] In this embodiment, the thickness of the lead-out portion is set to 0.1mm~0.5mm, so that the lead-out portion can have sufficient flow area to meet the needs of electrical connection, and the lead-out portion has sufficient mechanical strength to stably and reliably make electrical connections, and reduces the probability of problems such as inconvenient connection and increased cost caused by the lead-out portion being too thick, so that the lead-out portion can be stably and conveniently electrically connected.

[0049] In one embodiment of the present application, the portion of the conductive member exposed outside the membrane shell is a lead-out portion, and a width dimension of the lead-out portion in the second direction is 20 mm to 60 mm.

[0050] In this embodiment, the width dimension of the lead-out portion in the second direction is set to 20mm-60mm, so that the lead-out portion can have sufficient size in the second direction for convenient electrical connection operations, and the probability of the lead-out portion being too wide and difficult to bend, causing inconvenience in electrical connection operations, is reduced, thereby allowing the lead-out portion to be flexibly and conveniently electrically connected.

[0051] In one embodiment of the present application, the portion of the conductive member exposed outside the membrane shell is a lead-out portion, and the length of the lead-out portion in the third direction is 10 mm to 50 mm.

[0052] In this embodiment, the length dimension of the lead-out portion in the third direction is set to be greater than or equal to 10 mm, so that the lead-out portion can have sufficient length for electrical connection. The length dimension of the lead-out portion in the third direction is set to be less than or equal to 50 mm, which can reduce the cost increase and space occupation caused by the excessive length of the lead-out portion, and make the overall structure of the soft-pack battery cell more compact.

[0053] According to the second aspect of the present application, the battery device comprises a battery cell group, wherein the battery cell group comprises a plurality of the soft-pack battery cells stacked and arranged along the first direction, and the soft-pack battery cells are the soft-pack battery cells according to the first aspect of the present application.

[0054] According to the battery device of the present application, by setting the soft-pack battery cell of the first aspect above, by setting the thickness of the membrane shell to be less than 0.2 mm, and the first dimension to be greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery cell has a larger thickness and the wall thickness of the membrane shell is smaller, so that the soft-pack battery cell has a higher energy density. At the same time, the ratio of the second dimension to the first dimension of any membrane portion is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions of the membrane shell have similar or identical size structures and structural properties, so that the two membrane portions can have a more balanced bearing capacity for the stress generated in the accommodating cavity, etc., so that the overall structure of the membrane shell is more stable and the structural properties such as mechanical strength are better, so that the membrane shell can well meet the support and protection needs of the soft-pack battery cell when the thickness is larger under the condition that the wall thickness is less than or equal to 0.2 mm, so that the energy density of the soft-pack battery cell can be stably and reliably improved, thereby reducing the number of structural components such as support and heat conduction in the battery device, and increasing the arrangement space of the soft-pack battery cell in the battery device, so that the overall energy density of the battery device is greatly improved.

[0055] In some embodiments of the present application, the battery device further includes: a heat exchange plate, which is arranged on at least one side of the plurality of the soft-pack battery cells in a second direction for heat exchange with the plurality of the soft-pack battery cells, and the second direction intersects with the first direction.

[0056] In this embodiment, a heat exchange plate is provided, and the heat exchange plate is arranged on at least one side of the multiple soft-pack battery cells in the second direction. The structure is simple and the arrangement is reasonable, so that the heat exchange plate can conveniently exchange heat with the multiple soft-pack battery cells, so that the battery cell group can obtain a good heat exchange effect, the battery cell group can operate stably and reliably, and then the battery device can operate more stably.

[0057] In one embodiment of the present application, a surface of the membrane shell on one side facing the heat exchange plate in the second direction is flat, and is connected to the heat exchange plate via a thermally conductive adhesive or a thermally conductive pad.

[0058] In this embodiment, the surface of one side of the membrane shell facing the heat exchange plate is set to be a plane, which has a simple structure and can make the membrane shell and the heat exchange plate have a stable matching contact surface, so that the membrane shell can be stably and reliably fixed to the heat exchange plate through thermal conductive glue or thermal conductive pads, thereby making the assembly and fixation of the soft-pack battery monomer on the heat exchange plate more convenient and stable, and making the assembly and fixation of the battery cell group and the heat exchange plate more reliable.

[0059] In one embodiment of the present application, a sealing boss is formed on one side of the membrane shell in the second direction, and the battery device further includes: an adhesive layer, the adhesive layer being adhesively connected between the heat exchange plate and the soft-pack battery cell, wherein in the second direction, the height of the adhesive layer is greater than the protruding height of the sealing boss.

[0060] In this embodiment, one side of the membrane shell having the edge sealing boss is bonded to the heat exchange plate by an adhesive layer, and the height of the adhesive layer is greater than the protruding height of the edge sealing boss, so that the adhesive layer can fully cover the gap between the end face of the membrane shell and the heat exchange plate, so that the membrane shell can be reliably and stably bonded and fixed to the heat exchange plate through the adhesive layer, so that the battery cell group can be stably and reliably assembled and fixed to the heat exchange plate.

[0061] In one embodiment of the present application, the battery device further includes: an adhesive layer, the adhesive layer being adhesively connected between the heat exchange plate and the soft-pack battery cell, and a portion of the adhesive layer being configured to overflow between two adjacent soft-pack battery cells in the first direction to adhesively connect the two adjacent soft-pack battery cells.

[0062] In this embodiment, a portion of the adhesive layer is configured to overflow between two adjacent soft-pack battery cells in the first direction, so that the two adjacent soft-pack battery cells can be better connected and fixed at the end facing the heat exchange plate, making the overall arrangement of multiple soft-pack battery cells in the battery cell group more stable, and greatly increasing the bonding connection area between the soft-pack battery cell and the heat exchange plate through the adhesive layer, making the bonding and fixation of the soft-pack battery cell and the heat exchange plate more stable, thereby making the fixation of the battery cell group and the heat exchange plate more secure and stable.

[0063] In some embodiments of the present application, the battery device further includes a base plate and an adhesive layer, the base plate is located on one side of the battery cell group in the second direction, the battery cell group and the base plate are adhesively connected via the adhesive layer, the surface of the soft-pack battery cell facing the adhesive layer is a first surface, both side surfaces of the soft-pack battery cell in the first direction are second surfaces, the first surface is connected to two second surfaces by chamfers, wherein the battery device further includes a blocking member, the blocking member is disposed at the chamfer, and the blocking member is configured to prevent the adhesive layer located at the chamfer from overflowing to the position of the second surface.

[0064] In this embodiment, a blocking member is provided at the chamfer to block the overflow of the adhesive layer toward the second surface, which can effectively reduce the probability that the colloid in the adhesive layer overflows to the second surfaces of adjacent soft-pack battery cells when the battery cell group and the base plate are assembled by bonding with the adhesive layer, thereby effectively reducing the risk of damage to the soft-pack battery cells caused by stress concentration caused by the overflowing colloid, so that the soft-pack battery cells can maintain a stable structural state and service life.

[0065] In one embodiment of the present application, in the first direction, one blocking member is disposed between two adjacent soft-pack battery cells.

[0066] In this embodiment, a blocking member is disposed between two adjacent soft-pack battery cells, which makes it easier to arrange the blocking member and reduces the number of blocking members used, thereby reducing the cost of the battery device to a certain extent.

[0067] In one embodiment of the present application, the blocking member is a foam member, and the blocking member is adhesively connected to the bottom plate.

[0068] In this embodiment, the blocking member is configured as a foam member and is bonded to the bottom plate, which has a simple structure, so that the blocking member can be conveniently arranged at the chamfer and stably separate the overflow colloid of the adhesive layer, and is easy to assemble.

[0069] In one embodiment of the present application, the blocking member is an adhesive member, and the adhesive member is adhesively connected to one end of the soft-pack battery cell facing the bottom plate.

[0070] In this embodiment, the blocking member is configured as an adhesive member, which has a simple structure and can well meet the use requirements, making it more convenient to assemble and fix the blocking member and the soft-pack battery unit.

[0071] In some embodiments of the present application, a plurality of the soft-pack battery cells are stacked along the first direction, the battery device further comprises a partition having a harderness higher than that of the membrane shell, a plurality of the partitions are arranged at intervals in the first direction, and at least two of the soft-pack battery cells are arranged between two adjacent partitions.

[0072] In this embodiment, a plurality of partitions are arranged at intervals along a first direction, the hardness of the partitions is greater than the hardness of the membrane shell, and at least two soft-pack battery cells are arranged between two adjacent partitions, so that the plurality of soft-pack battery cells in the battery cell group can obtain stable and reliable support from the partitions in the first direction, thereby making the overall structure of the battery cell group more stable, and can reduce the number of partitions arranged, so that the battery device can maintain a higher energy density.

[0073] In one embodiment of the present application, the number of the soft-pack battery cells sequentially arranged between two adjacent separators along the first direction is less than or equal to four.

[0074] In this embodiment, the number of soft-pack battery cells between two adjacent partitions is set to be less than or equal to four, so that the number of soft-pack battery cells arranged between two adjacent partitions is more appropriate, so that each soft-pack battery cell between the two partitions can obtain stable and effective support from the two partitions, thereby reducing the probability that the number of soft-pack battery cells between the two partitions is too large and exceeds the supporting capacity of the partition, so that multiple partitions can provide stable and reliable support for each soft-pack battery cell in the battery cell group, and the overall structural stability of the battery cell group is better.

[0075] In one embodiment of the present application, the soft-pack battery cell extends along a third direction, the third direction is the length direction of the soft-pack battery cell, the length direction of the partition extends along the length direction of the soft-pack battery cell, and the length of the partition is greater than 80% of the length of the soft-pack battery cell.

[0076] In this embodiment, the length of the partition is set to be greater than 80% of the length of the soft-pack battery cell, so that the soft-pack battery cell and the partition can have a larger matching support surface, so that the partition can cover most or all of the extension range of the soft-pack battery cell in the third direction, so that the partition can have a good supporting and separating effect on the soft-pack battery cell.

[0077] In one embodiment of the present application, there are multiple battery cell groups, at least two of which are arranged in a third direction, and the length of the partition is greater than twice the length of the soft-pack battery cell, so that two adjacent battery cell groups arranged along the length direction of the soft-pack battery cell share one partition.

[0078] In this embodiment, the number of battery cell groups is set to be multiple and arranged in the third direction, which has a simple structure and reasonable layout, and can well meet the use requirements of the battery device. The length of the partition is set to be greater than twice the length of the soft-pack battery cell, so that the partition can support at least two adjacent soft-pack battery cells at the same time, which can reduce the number of partitions arranged, so that the positioning of multiple battery cell groups is more convenient and the arrangement is more consistent, thereby to a certain extent, the assembly efficiency of the battery device is greatly improved.

[0079] In one embodiment of the present application, the thickness of the separator along the first direction is less than the thickness of the soft-pack battery cell, and the width of the separator along the second direction is greater than 80% of the width of the soft-pack battery cell.

[0080] In this embodiment, the width of the partition is set to be greater than 80% of the width of the soft-pack battery cell, so that the soft-pack battery cell and the partition can form a larger supporting and matching area, so that the partition can cover most of the surface of the soft-pack battery cell on one side of the first direction, so that the partition can have a good supporting and separating effect on the soft-pack battery cell.

[0081] In one embodiment of the present application, the thickness of the partition along the first direction is 0.8 mm to 2.0 mm.

[0082] In this embodiment, the thickness of the partition is set to be greater than or equal to 0.8 mm, so that the partition can have good structural strength to stably and reliably support the soft-pack battery cell. The thickness of the partition is set to be less than or equal to 2 mm, so that the partition has a thinner thickness while meeting the support requirements, thereby reducing the space occupied by the partition in the battery device, thereby allowing the battery device to have a higher energy density.

[0083] In one embodiment of the present application, the partition is an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate.

[0084] In this embodiment, the partition is set to an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate, so that the partition can have good mechanical strength, so that the partition can meet the support requirements well, and the partition has good thermal conductivity, so that the soft-pack battery cells in the battery cell group can exchange heat through the partition, so that the battery cell group can obtain a better heat exchange effect.

[0085] In one embodiment of the present application, the partition is a solid structure.

[0086] In this embodiment, the partition is set to a solid structure, so that the partition can have good mechanical strength and support reliability, so that the multiple soft-pack battery cells in the battery cell group can be supported more stably and reliably.

[0087] In one embodiment of the present application, the partition is a heat conductive member and is thermally connected to the membrane shell.

[0088] In this embodiment, the partition is configured to be thermally connected to the membrane shell by a heat conductor, so that the partition can play a good heat exchange role for the soft-pack battery monomer, so that the soft-pack battery monomer can exchange heat through the partition in a first direction, so that the battery cell group can obtain a better heat exchange effect, and the battery device can have better thermal management performance.

[0089] In one embodiment of the present application, a heat exchange channel is formed in the partition.

[0090] In this embodiment, a heat exchange flow channel is formed in the partition, so that the partition can be used as a liquid cooling plate to perform efficient heat exchange operations on the soft-pack battery cells, so that the heat exchange effect of the partition on the soft-pack battery cells in the first direction can be greatly improved, so that the battery cell group can obtain a better heat exchange effect, and the battery device can have better thermal management performance. The partition integrates a liquid cooling heat exchange function, which reduces the need for additional heat exchange structures. While improving the heat exchange effect, the number of structural components other than the soft-pack battery cells in the battery device is reduced, so that the battery cell group in the battery device can be arranged more compactly, so that the battery device can maintain a higher energy density.

[0091] In one embodiment of the present application, the separator is adhesively connected to adjacent soft-pack battery cells.

[0092] In this embodiment, the partition is bonded to the adjacent soft-pack battery cells, which has a simple structure and is easy to fix, so that the partition and the soft-pack battery cells can be arranged compactly, thereby making the overall structure of the battery cell group more compact and stable.

[0093] In one embodiment of the present application, the separator is bonded and fixed to the adjacent soft-pack battery cells by double-sided tape.

[0094] In this embodiment, the separator and the adjacent soft-pack battery cells are bonded and fixed by double-sided adhesive, which has a simple structure and is convenient and reliable to fix.

[0095] In one embodiment of the present application, in the first direction, a buffer is provided between at least two adjacent soft-pack battery cells, and the hardness of the buffer is less than the hardness of the film shell.

[0096] In this embodiment, a buffer is provided between two adjacent soft-pack batteries, and the hardness of the buffer is less than the hardness of the membrane shell, so that the buffer can well absorb the deformation of the soft-pack battery cell and the vibration under external impact, and can play a good buffering role in the direct contact friction of adjacent soft-pack battery cell brackets, so that the overall structural stability of the battery cell group is better, so that the battery device can operate more stably and reliably.

[0097] In some examples of the present application, in the first direction, the buffer and the separator are disposed simultaneously between at least two adjacent soft-pack battery cells.

[0098] In this embodiment, a buffer member and a partition are provided between at least two adjacent soft-pack battery cells. The structure is simple and the arrangement is convenient, so that the partition can cooperate with the buffer member to provide a good support for the soft-pack battery cell. The buffer member and the partition can cooperate to provide a good buffering effect for the two adjacent soft-pack battery cells where the partition is arranged, so that any two adjacent soft-pack battery cells in the battery cell group can obtain a good buffering effect, making the overall structure of the battery cell group more stable.

[0099] In some examples of the present application, in the first direction, at most one of the buffer and the separator is disposed between any two adjacent soft-pack battery cells.

[0100] In the present embodiment, at most one of the buffer and the partition is provided between any two adjacent soft-pack battery cells, so that the partitions and the buffer arranged in the battery cell group can be arranged at intervals or staggered, thereby reducing the difficulty of assembling when the partition and the buffer are arranged between the same two soft-pack battery cells at the same time, so that the battery cell group, the partition and the buffer can be assembled conveniently and easily.

[0101] In some examples of the present application, in the first direction, at least one of the soft-pack battery cells is sandwiched between the buffer and the separator.

[0102] In the present embodiment, at least one soft-pack battery cell is disposed between the buffer and the partition, and the structure is simple, so that the partition and the buffer can be arranged flexibly and conveniently in the battery cell group, and the buffer and the partition can cooperate to provide good support and buffering for multiple soft-pack battery cells, thereby making the battery device more convenient to assemble and allowing the battery device to operate stably.

[0103] In an example of the present application, in the first direction, one of the buffer and the partition is provided between any two adjacent soft-pack battery cells, and the buffer and the partition in the battery cell group are alternately arranged along the first direction.

[0104] In this embodiment, a buffer member or a partition is arranged between two adjacent soft-pack battery cells in the battery cell group. The buffer member and the partition are arranged alternately in the first direction. The structure is simple, so that the arrangement of the partition and the buffer member in the battery cell group is more balanced, so that each soft-pack battery cell in the battery cell group can obtain stable and reliable support and buffering effect, thereby making the overall structural stability of the battery cell group better, so that the battery device operates more stably and has better thermal management performance.

[0105] In some examples of the present application, the buffer member covers more than 80% of the surface area of ​​the thickness side of the soft-pack battery cell.

[0106] In this embodiment, the buffer component is arranged to cover more than 80% of the surface area of ​​the thickness side of the soft-pack battery cell, so that the soft-pack battery cell and the buffer component can form a larger buffer matching area, so that the buffer component can cover most of the surface of the soft-pack battery cell on one side of the first direction, so that the buffer component can play a stable and effective buffering role on the soft-pack battery cell.

[0107] In some embodiments of the present application, the soft-pack battery cell has conductive parts at both ends in the third direction, the conductive parts are electrically connected to the electrode assembly and at least partially exposed outside the membrane shell, and the conductive parts on the same side of two adjacent soft-pack battery cells in the battery cell group are connected.

[0108] In this embodiment, by connecting the conductive members on the same side of two adjacent soft-pack battery cells, different electrical connection modes of multiple soft-pack battery cells in the battery cell group can be met, making the electrical connection of multiple soft-pack battery cells more convenient and easy.

[0109] In one embodiment of the present application, the battery cell group includes at least three soft-pack battery cells, and the soft-pack battery cell located between two adjacent soft-pack battery cells in the battery cell group is an intermediate battery cell, and of the two conductive members at both ends of the intermediate battery cell, one conductive member is connected to the conductive member on the same side of a soft-pack battery cell adjacent to the intermediate battery cell, and the other conductive member is connected to the conductive member on the same side of another soft-pack battery cell adjacent to the intermediate battery cell.

[0110] In the present embodiment, one conductive part of the middle battery cell is connected to the conductive part on the same side of an adjacent soft-pack battery cell, and the other conductive part of the middle battery cell is connected to the conductive part on the same side of another adjacent soft-pack battery cell. The structure is simple and the connection relationship is clear and simple, so that a single conductive part is connected only to a single conductive part, thereby reducing the probability of problems such as confusion in the connection relationship and the need to increase adapters when a single conductive part is connected to multiple conductive parts when multiple soft-pack batteries are used. Therefore, multiple soft-pack battery cells can be easily connected, making the battery cell group more efficient and convenient when assembled.

[0111] In one embodiment of the present application, the two conductive members constituting the connection are overlapped and connected, and at least one conductive member is in a bent shape.

[0112] In this embodiment, the two conductive parts constituting the connection are arranged to be overlapped and connected, so that the two conductive parts have a larger connection area, so that the connection and fixation of the two conductive parts are more stable and reliable. At least one conductive part is in a bent shape, which makes it more convenient and easy to connect the two conductive parts.

[0113] In one embodiment of the present application, the two conductive members constituting the connection are connected via a transition piece, and the transition piece is in a bent shape.

[0114] In the present embodiment, the two conductive parts constituting the connection are connected via an adapter sheet, which can reduce the number of processing steps and processes for the conductive parts when connecting the soft-pack battery cells. Fast and efficient connection processing can be performed by using standardized adapter sheets, thereby making the connection of multiple soft-pack battery cells more convenient and efficient, and improving the production efficiency of the battery cell group.

[0115] In one embodiment of the present application, the connection is in a curved shape, and the curved shape is U-shaped.

[0116] In this embodiment, the connection between two connected conductive parts is formed into a curved shape and the curved shape is U-shaped, which has a simple structure and is easy to process and form. It can also greatly reduce the stress concentration at the connection between the two connecting parts, making the connection between the two connecting parts more stable and reliable.

[0117] In one embodiment of the present application, the polarities of the two pole ears extending from both ends of the soft-pack battery cell are opposite, and the polarities of the two conductive members connected by overlap are the same or opposite.

[0118] In this embodiment, the polarities of the two pole ears extending from both ends of the soft-pack battery cell are opposite to meet the use requirements of the soft-pack battery cell. The polarities of the two overlapping conductive parts are the same or opposite, so that multiple soft-pack battery cells can be flexibly connected and assembled as needed.

[0119] In one embodiment of the present application, there are multiple battery cell groups, and at least two of the battery cell groups are arranged in a third direction, wherein the conductive members of two adjacent soft-pack battery cells along the third direction are directly connected.

[0120] In this embodiment, the conductive parts of two adjacent soft-pack battery cells along the third direction are directly connected, which has a simple structure and is convenient and easy to connect. It can effectively reduce the steps and processes of bending the conductive parts of two adjacent soft-pack battery cells for connection during production or the number of adapters used for connection, thereby making the production efficiency of the battery cell group higher during production and processing.

[0121] In some embodiments of the present application, the soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0122] In this embodiment, the soft-pack battery cell is set to any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell can be flexibly set to different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell wider, so that the battery device can better meet different usage requirements.

[0123] In one embodiment of the present application, the soft-pack battery cell is a ternary battery cell, the battery device further comprises a shell, a plurality of the soft-pack battery cells are accommodated in the shell, and in the second direction, the shell is provided with a pressure relief area.

[0124] The energy storage device according to the third aspect of the present application comprises: a power conversion device and a battery device according to the second aspect of the present application, wherein the battery device is used to store or provide electrical energy.

[0125] According to the energy storage device of the present application, by setting the battery device of the second aspect mentioned above, by setting the thickness of the membrane shell to be less than 0.2 mm, and the first dimension is greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery monomer has a larger thickness and the wall thickness of the membrane shell is smaller, so that the soft-pack battery monomer has a higher energy density. At the same time, the ratio of the second dimension to the first dimension of any membrane portion is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions of the membrane shell have similar or identical size structures and structural properties, so that the two membrane portions can have a more balanced bearing capacity for the stress generated in the accommodating cavity, etc., so that the overall structure of the membrane shell is more stable and the structural properties such as mechanical strength are better, so that the membrane shell can meet the support and protection needs of the soft-pack battery monomer when the thickness is larger under the condition that the wall thickness is less than or equal to 0.2 mm, so that the energy density of the soft-pack battery monomer can be stably and reliably improved, thereby reducing the number of structural components such as support and heat conduction in the battery device, and increasing the arrangement space of the soft-pack battery monomer in the battery device, so that the overall energy density of the battery device is greatly improved.

[0126] The electrical device according to the fourth aspect of the present application includes the battery device according to the second aspect of the present application or the energy storage device according to the third aspect of the present application, and the battery device is used to store or provide electrical energy.

[0127] According to the electric device of the present application, by setting the battery device of the second aspect or the energy storage device of the third aspect, by setting the thickness of the membrane shell to be less than 0.2 mm, and the first dimension is greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery monomer has a larger thickness and the wall thickness of the membrane shell is smaller, so that the soft-pack battery monomer has a higher energy density. At the same time, the ratio of the second dimension to the first dimension of any membrane portion is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions of the membrane shell have similar or identical size structures and structural properties, so that the two membrane portions can have a more balanced bearing capacity for the stress generated in the accommodating cavity, etc., so that the overall structure of the membrane shell is more stable and the structural properties such as mechanical strength are better, so that the membrane shell can meet the support and protection needs of the soft-pack battery monomer when the thickness is larger under the condition that the wall thickness is less than or equal to 0.2 mm, so that the energy density of the soft-pack battery monomer can be stably and reliably improved, thereby reducing the number of structural components such as support and heat conduction in the battery device, and increasing the arrangement space of the soft-pack battery monomer in the battery device, so that the overall energy density of the battery device is greatly improved.

[0128] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0129] Figure 1is a schematic diagram of a soft-pack battery cell according to an embodiment of the present application;

[0130] Figure 2 yes Figure 1 A schematic diagram of a local enlargement at A shown in FIG.

[0131] Figure 3 is a schematic diagram of a soft-pack battery cell according to an embodiment of the present application from another angle;

[0132] Figure 4 yes Figure 3 A schematic diagram of a partial enlargement of point B shown in FIG.

[0133] Figure 5 is a schematic diagram of a soft-pack battery cell according to an embodiment of the present application from another angle;

[0134] Figure 6 is a schematic diagram of a battery device according to an embodiment of the present application;

[0135] Figure 7 is a schematic diagram of a battery cell group, a heat exchange plate, a partition and a buffer according to an embodiment of the present application;

[0136] Figure 8 yes Figure 7 A schematic diagram of a local enlargement of C shown in FIG.

[0137] Fig. 9 is a schematic diagram of two soft-pack battery cells and a heat exchange plate of adjacent battery cell groups according to an embodiment of the present application;

[0138] Fig.10 yes Fig. 9 A locally enlarged schematic diagram of D shown in FIG.

[0139] Fig.11 is a schematic diagram of a battery cell group, a partition and a buffer according to an embodiment of the present application;

[0140] Fig.12 yes Fig.11 A locally enlarged schematic diagram of E shown in FIG.

[0141] Fig.13 is a schematic diagram of a battery cell group, a partition, a buffer, and an adapter according to an embodiment of the present application;

[0142] Fig.14 yes Fig.13 A partially enlarged schematic diagram of the F shown in FIG.

[0143] Fig.15 is a partially enlarged schematic diagram of a soft-pack battery cell and a blocking member according to an embodiment of the present application;

[0144] Fig.16 is a schematic diagram of an electrical device according to an embodiment of the present application.

[0145] Reference numerals:

[0146] 10. Soft pack battery monomer;

[0147] 11. membrane shell; 1101. edge sealing boss;

[0148] 111, membrane part; 1111, edge sealing;

[0149] 1112, side wall; 11121, first arc segment; 11122, straight line segment; 11123, second arc segment;

[0150] 1113. Bottom wall;

[0151] 12. Conductive parts;

[0152] 20. baffle; 30. buffer; 40. adhesive layer; 50. heat exchange plate; 60. box; 70. adapter; 80. blocking member;

[0153] 100, battery device; 200, motor; 300, controller;

[0154] 1000. Electrical equipment. DETAILED DESCRIPTION

[0155] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0156] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0157] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0158] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0159] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 this article generally indicates that the associated objects before and after are in an "or" relationship.

[0160] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0161] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0162] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0163] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding. Among them, lithium-ion batteries account for an increasing proportion of the power batteries currently used.

[0164] When the battery cells in the battery device are soft-pack battery cells, since the soft-pack battery cells are easily deformed, it is necessary to arrange support structures and heat-conducting, buffering and other structures to meet the needs of stable and reliable stacking and operation of multiple soft-pack battery cells. At present, the thickness of a single soft-pack battery cell is relatively small, so the battery device needs to be equipped with a large number of soft-pack battery cells, which makes the number of support, heat-conducting and other structural components arranged in the battery device large, thereby making the overall energy density of the battery device relatively small.

[0165] Based on the above considerations, in order to improve the overall energy density of the battery device, the present application designs a soft-pack battery cell. By setting the thickness of the soft-pack battery cell to be larger, the energy density of the soft-pack battery cell is increased, thereby reducing the number of structural components such as support and heat conduction arranged in the battery device under the same size specifications, and increasing the proportion of the soft-pack battery cell in the battery device, thereby greatly improving the overall energy density of the battery device.

[0166] The soft-pack battery cell disclosed in the embodiment of the present application can be used in an electric device using the soft-pack battery cell as a power source, or various energy storage systems using the battery device as an energy storage element. The electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0167] For example, when the electrical device is a vehicle, the vehicle 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 starting, navigating and driving the vehicle.

[0168] In some embodiments of the present application, the battery device can 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.

[0169] In the present application, a battery device refers to a single physical module including one or more soft-pack battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application may be a battery module or a battery pack.

[0170] Reference below Figure 1-Figure 16A soft-pack battery cell 10 according to an embodiment of the first aspect of the present application is described. Figure 1 is a schematic diagram of a soft-pack battery cell 10 according to an embodiment of the present application; Figure 2 yes Figure 1 A schematic diagram of a local enlargement at A shown in FIG. Figure 3 is a schematic diagram of a soft-pack battery cell 10 according to an embodiment of the present application from another angle; Figure 4 yes Figure 3 A schematic diagram of a partial enlargement of point B shown in FIG. Figure 5 is a schematic diagram of a soft-pack battery cell 10 according to an embodiment of the present application from another angle; Figure 6 is a schematic diagram of a battery device 100 according to an embodiment of the present application; Figure 7 is a schematic diagram of a battery cell group, a heat exchange plate 50, a partition 20, and a buffer member 30 according to an embodiment of the present application; Figure 8 yes Figure 7 A schematic diagram of a local enlargement of C shown in FIG. Fig. 9 is a schematic diagram of two soft-pack battery cells 10 and a heat exchange plate 50 of adjacent battery cell groups according to an embodiment of the present application; Fig.10 yes Fig. 9 A locally enlarged schematic diagram of D shown in FIG. Fig.11 is a schematic diagram of a battery cell group, a partition 20 and a buffer member 30 according to an embodiment of the present application; Fig.12 yes Fig.11 A locally enlarged schematic diagram of E shown in FIG. Fig.13 is a schematic diagram of a battery cell group, a partition 20, a buffer member 30, and a transfer sheet 70 according to an embodiment of the present application; Fig.14 yes Fig.13 A partially enlarged schematic diagram of the F shown in FIG. Fig.15 is a partially enlarged schematic diagram of a soft-pack battery cell 10 and a blocking member 80 according to an embodiment of the present application; Fig.16 is a schematic diagram of an electrical device 1000 according to an embodiment of the present application.

[0171] First reference Figure 1-Figure 16 The battery device 100 according to the second embodiment of the present application is described. Figure 7 As shown, the battery device 100 according to the embodiment of the present application includes a battery cell group, and the battery cell group includes a battery cell group along a first direction (such as Figure 7 For the multiple soft-pack battery cells 10 stacked and arranged (in the x-direction as shown), the first direction may be the thickness direction of the soft-pack battery cells 10.

[0172] Reference below Figure 1-Figure 16 A soft-pack battery cell 10 according to an embodiment of the first aspect of the present application is described.

[0173] like Figure 1-Figure 16As shown, according to an embodiment of the present application, the soft-pack battery cell 10 includes: a membrane shell 11 and an electrode assembly, the wall thickness of the membrane shell 11 is less than or equal to 0.2 mm, the membrane shell 11 includes two membrane portions 111 connected in a first direction, the two membrane portions 111 both define a receiving groove, the receiving grooves of the two membrane portions 111 are arranged opposite to each other in the first direction, and together constitute a receiving cavity of the membrane shell 11; the electrode assembly is arranged in the receiving cavity, wherein the size of the soft-pack battery cell 10 in the first direction is a first size, the size of any one of the membrane portions 111 in the first direction is a second size, the first size is greater than or equal to 5 mm and less than or equal to 70 mm, and the ratio of the second size to the first size is greater than or equal to 0.4 and less than or equal to 0.6.

[0174] In this embodiment, the soft-pack battery cell 10 includes a film shell 11 and an electrode assembly. The film shell 11 can be an aluminum-plastic film. The two film portions 111 connected in the first direction of the film shell 11 can be formed by punching the aluminum-plastic film substrate. The two film portions 111 both define a receiving groove, and the film shell 11 can be formed by double punching. The receiving grooves of the two film portions 111 are arranged opposite to each other in the first direction and together constitute a receiving cavity of the film shell 11, and the electrode assembly is arranged in the receiving cavity. Exemplarily, during the production and processing of the soft-pack battery cell 10, the film shell 11 can be formed into two film portions 111 with receiving grooves by double punching, and the electrode assembly is arranged in the receiving groove of one of the film portions 111, and the other film portion 111 is folded toward the film portion 111 that receives the electrode assembly, so that the two receiving grooves cooperate to form a receiving cavity. The soft-pack battery cell 10 then undergoes subsequent production processes such as hot pressing and edge sealing, and liquid injection. The two film portions 111 form a closed receiving cavity through the edge sealing 1111, thereby forming a complete film shell 11.

[0175] In this embodiment, the wall thickness of the membrane shell 11 is less than or equal to 0.2 mm. For example, the wall thickness of the membrane shell 11 can be 0.2 mm, 0.19 mm, 0.17 mm, 0.15 mm, 0.1 mm, etc. The size of the soft-pack battery cell 10 in the first direction is the first size, which is the thickness of the soft-pack battery cell 10. The first size is greater than or equal to 5 mm and less than or equal to 70 mm. Figure 4 As shown in the figure, d1 is represented as the first size, and d1 can be 5mm, 6mm, 10mm, 12mm, 17mm, 25mm, 30mm, 40mm, 47mm, 53mm, 60mm, 65mm, 70mm, etc. The size of any membrane portion 111 in the first direction is the second size, and the second sizes of the two membrane portions 111 can be set to be the same or different as needed. Since the soft-pack battery cell 10 is composed of two membrane portions 111 to form a membrane shell 11, the overall size of the two membrane portions 111 in the first direction is the first size, that is, the sum of the second sizes of the two membrane portions 111 is equal to the first size.

[0176] In this embodiment, the ratio of the second size to the first size is greater than or equal to 0.4 and less than or equal to 0.6. Figure 4 As shown in the figure, d2 is represented as the second size, and the ratio of d2 to d1 can be 0.4, 0.45, 0.5, 0.52, 0.54, 0.55, 0.6, etc., and the second size of the other membrane portion 111 can be 0.6, 0.55, 0.5, 0.48, 0.46, 0.45, 0.4, etc. corresponding to the ratio of the first size.

[0177] The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The soft-pack battery cell 10 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector.

[0178] In this embodiment, by setting the wall thickness of the membrane shell 11 to be less than or equal to 0.2 mm, the volume of the membrane shell 11 in the soft-pack battery cell 10 is smaller and the mass is lighter, and the volume and mass of the electrode assembly in the soft-pack battery cell 10 are larger, so that the energy density of the soft-pack battery cell 10 can be greatly improved. The first dimension is set to be greater than or equal to 5 mm and less than or equal to 70 mm, so that the thickness of the soft-pack battery cell 10 is thicker, so that with the thinner membrane shell 11, the soft-pack battery cell 10 can have a higher energy density, and the thickness of the soft-pack battery cell 10 can be flexibly set within a larger range as needed, so that the soft-pack battery cell 10 can better meet the use needs of battery devices 100 of different sizes.

[0179] In the present embodiment, the ratio of the second dimension to the first dimension is set to be greater than or equal to 0.4 and less than or equal to 0.6, so that the dimensions of the two membrane portions 111 in the first direction can be relatively consistent, and the two membrane portions 111 can maintain sufficient mechanical strength to meet the molding requirements of the membrane shell 11, so that when the first dimension of the soft-pack battery cell 10 of the present embodiment is set to be greater than or equal to 5 mm and less than or equal to 70 mm, a stable and reliable membrane shell 11 is formed.

[0180] In the present embodiment, by setting the thickness of the membrane shell 11 to be less than 0.2 mm, the ratio of the second dimension to the first dimension of any membrane portion 111 is greater than or equal to 0.4 and less than or equal to 0.6, and the first dimension is greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery cell 10 can have a larger thickness and a higher energy density. In the same volume, compared with a plurality of thinner soft-pack battery cells 10, the number of soft-pack battery cells 10 arranged in the present embodiment is smaller, thereby reducing the proportion of the membrane shell 11 therein, and thereby allowing a plurality of soft-pack battery cells 10 in the same volume to have a higher energy density.

[0181] For example, the first dimension of the soft-pack battery cell 10 in the present embodiment is 5 mm, while the first dimension of the thinner soft-pack battery cell 10 is 1 mm. When the 5 mm soft-pack battery cell 10 is arranged along the first direction, five thinner soft-pack battery cells 10 need to be arranged, that is, there are five shell structures therein, while only one soft-pack battery cell 10 in the present embodiment needs to be arranged, that is, it only includes one shell structure, thereby greatly improving the energy density of the soft-pack battery cells 10 when they are arranged.

[0182] It can be understood that the volume ratio occupied by the membrane shell 11 in the soft-pack battery cell 10 has a great relationship with the wall thickness of the membrane shell 11 and the overall size of the soft-pack battery cell 10. For example, when a membrane shell 11 with the same wall thickness is provided in soft-pack battery cells 10 of different sizes, the volume ratio occupied by the membrane shell 11 in the smaller soft-pack battery cell 10 is larger, while the volume ratio occupied by the membrane shell 11 in the larger soft-pack battery cell 10 is smaller, thereby making the energy density of the smaller soft-pack battery cell 10 lower and the energy density of the larger soft-pack battery cell 10 higher. On the other hand, in the soft-pack battery cells 10 of the same size, the greater the wall thickness of the membrane shell 11, the greater the volume ratio occupied by the membrane shell 11 in the soft-pack battery cell 10, and the lower the energy density of the soft-pack battery cell 10.

[0183] In this embodiment, the wall thickness of the membrane shell 11 is set to be less than or equal to 0.2 mm, and the first dimension of the soft-pack battery cell 10 is greater than or equal to 5 mm, so that the soft-pack battery cell 10 can have a larger dimension in the first direction while the wall thickness of the membrane shell 11 is smaller, so that the soft-pack battery cell 10 can have a higher energy density.

[0184] When the size of the soft-pack battery cell 10 is too large, the soft-pack battery cell 10 has higher requirements on the material strength and mechanical strength of the membrane shell 11, and the wall thickness of the membrane shell 11 needs to be increased according to actual conditions. This makes it possible for the energy density of the soft-pack battery cell 10 to decrease. In this embodiment, the first size of the soft-pack battery cell 10 is set to be less than or equal to 70 mm and the wall thickness of the membrane shell 11 is set to be less than or equal to 0.2 mm, so that the soft-pack battery cell 10 can be set to a larger size as needed when the wall thickness of the membrane shell 11 is small, thereby allowing the soft-pack battery cell 10 to maintain a higher energy density.

[0185] In this embodiment, the dimension of any one of the two membrane portions 111 in the membrane shell 11 in the first direction is set to the second dimension, and the ratio of the second dimension to the first dimension is set to be greater than or equal to 0.4 and less than or equal to 0.6, so that the dimension structures of the two membrane portions 111 are similar or the same, and the space sizes of the accommodating cavities formed by the two membrane portions 111 are relatively similar or the same, so that the two membrane portions 111 can have similar or the same structural properties, the two membrane portions 111 have relatively consistent supporting effects on the soft-pack battery cell 10, and the two membrane portions 111 of the membrane shell 11 can have a more balanced distribution and bearing capacity for the stress generated inside, so that the overall structure of the constructed membrane shell 11 is more stable, and the membrane shell 11 has better structural properties such as mechanical strength, so that the membrane shell 11 can stably and reliably meet the support and protection needs of the soft-pack battery cell 10 when the first dimension is set to be greater than or equal to 5 mm and less than or equal to 70 mm under the condition that the wall thickness is less than or equal to 0.2 mm, so that the soft-pack battery cell 10 of this embodiment can stably and reliably improve the energy density of the soft-pack battery cell 10 with good structural properties.

[0186] When the soft-pack battery cells 10 in this embodiment are assembled and arranged in the battery device 100, within the same arrangement space, the battery device 100 can arrange fewer soft-pack battery cells 10 to obtain a higher energy density, and due to the reduction in the number of soft-pack battery cells, the number of supporting structures used to support the soft-pack battery cells 10 and structural components such as heat conduction and bonding and fixing is also greatly reduced, so that there can be more space in the battery device 100 to arrange the soft-pack battery cells 10, thereby greatly improving the overall energy density of the battery device 100.

[0187] According to the soft-pack battery cell 10 of the embodiment of the present application, by setting the thickness of the membrane shell 11 to be less than 0.2 mm, and the first dimension to be greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery cell 10 has a larger thickness and the wall thickness of the membrane shell 11 is smaller, so that the soft-pack battery cell 10 has a higher energy density. At the same time, the ratio of the second dimension to the first dimension of any membrane portion 111 is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions 111 of the membrane shell 11 have similar or identical size structures and structural properties, so that the two membrane portions 111 can be used to accommodate the inner cavity. The generated stresses have a relatively balanced bearing capacity, making the overall structure of the membrane shell 11 more stable and having better structural properties such as mechanical strength, so that the membrane shell 11 can well meet the support and protection needs of the soft-pack battery cell 10 when the thickness is larger under the condition that the wall thickness is less than or equal to 0.2 mm, thereby stably and reliably improving the energy density of the soft-pack battery cell 10, thereby reducing the number of structural components such as support and heat conduction in the battery device 100, and increasing the arrangement space of the soft-pack battery cell 10 in the battery device 100, thereby greatly improving the overall energy density of the battery device 100.

[0188] In some embodiments of the present application, reference Figure 4 As shown, the ratio of the second size to the first size may be greater than or equal to 0.45 and less than or equal to 0.55.

[0189] In this embodiment, the ratio of the second size to the first size is set to be greater than or equal to 0.45 and less than or equal to 0.55. For example, the ratio of d2 to d1 can be 0.45, 0.46, 0.48, 0.49, 0.5, 0.51, 0.53, 0.55, etc.

[0190] In this embodiment, by setting the ratio of the second dimension to the first dimension to be greater than or equal to 0.45 and less than or equal to 0.55, the dimensions of the two membrane portions 111 in the first direction are more consistent, which is convenient for processing and manufacturing, and the accommodating grooves of the two membrane portions 111 can have a sufficient depth to facilitate the arrangement of the electrode assembly, and the two membrane portions 111 maintain a relatively consistent mechanical strength, so that the overall structure of the membrane shell 11 is more stable and reliable, so that the soft-pack battery cell 10 can operate and use stably and reliably.

[0191] In one embodiment of the present application, reference Figure 4 As shown, the ratio of the second size to the first size may be 0.5.

[0192] In this embodiment, the ratio of the first dimension to the first dimension is 0.5, that is, the two membrane parts 111 have the same dimension in the first direction, the two membrane parts 111 can form a symmetrical structure, and the dimensions of the receiving grooves of the two membrane parts 111 are also the same.

[0193] In this embodiment, the ratio of the second size to the first size is set to 0.5, so that the two membrane parts 111 can have the same structural structure, thereby making the processing and forming of the membrane shell 11 more convenient, and the two membrane parts 111 can have consistent mechanical strength and structural performance, so that the overall structural stability and reliability of the membrane shell 11 are better, and the operation of the soft-pack battery cell 10 is more stable.

[0194] In some embodiments of the present application, reference Figure 4 and Figure 8 As shown, the first dimension may be greater than or equal to 15 mm and less than or equal to 45 mm.

[0195] In this embodiment, the first size is set to be greater than or equal to 15 mm and less than or equal to 45 mm. For example, d1 can be 15 mm, 16 mm, 20 mm, 25 mm, 35 mm, 40 mm, 42 mm, 45 mm, etc.

[0196] In the present embodiment, the first dimension is set to be greater than or equal to 15 mm and less than or equal to 45 mm, so that the soft-pack battery cell 10 has a larger thickness, the energy density of the battery device 100 can be greatly improved, and the probability of a decrease in the structural stability of the soft-pack battery cell 10 caused by the excessive thickness of the soft-pack battery cell 10 is reduced, so that the soft-pack battery cell 10 has an appropriate thickness for stable and reliable operation.

[0197] In some embodiments of the present application, reference Figure 4 As shown, the second dimension may be greater than or equal to 3 mm and less than or equal to 35 mm.

[0198] The second size is greater than or equal to 3 mm and less than or equal to 35 mm. For example, d2 can be 3 mm, 5 mm, 6 mm, 8 mm, 15 mm, 30 mm, 35 mm, etc.

[0199] In this embodiment, the second size is set to be greater than or equal to 3 mm and less than or equal to 35 mm, so that the two film portions 111 can cooperate to form a film shell 11 of the required thickness for the soft-pack battery, meeting the setting requirements of the soft-pack battery monomer 10.

[0200] In one embodiment of the present application, reference Figure 4 As shown, the second dimension may be greater than or equal to 7 mm and less than or equal to 22 mm.

[0201] In this embodiment, the second size is further limited to be greater than or equal to 7 mm and less than or equal to 22 mm. For example, d2 can be 7 mm, 8 mm, 10 mm, 12 mm, 15 mm, 20 mm, 22 mm, etc.

[0202] In this embodiment, the second dimension is set to be greater than or equal to 7 mm and less than or equal to 22 mm, so that the membrane portion 111 has a more suitable size in the first direction, so that the membrane portion 111 can have good mechanical strength and structural stability, so that the overall structure of the membrane shell 11 is more stable and reliable, and the electrode assembly can be stably and reliably arranged in the accommodating cavity, so that the soft-pack battery cell 10 can operate more stably.

[0203] In some embodiments of the present application, Figure 2 and Figure 4 As shown, the membrane portion 111 may include: an edge seal 1111, a side wall 1112 and a bottom wall 1113, the edge seal 1111 and the bottom wall 1113 are arranged at intervals in the first direction, the side wall 1112 extends in a ring shape along the circumference of the bottom wall 1113, one end of the side wall 1112 in the first direction is connected to the circumference of the bottom wall 1113, and the other end extends along the first direction to be connected to the edge seal 1111, the edge seal 1111, the side wall 1112 and the bottom wall 1113 cooperate to enclose a receiving groove that is open on one side in the first direction, and at least a portion of the electrode assembly is disposed in the receiving groove.

[0204] In this embodiment, the membrane portion 111 includes an edge seal 1111, a side wall 1112 and a bottom wall 1113. The edge seal 1111 and the bottom wall 1113 are arranged at intervals in a first direction and are connected through the side wall 1112. The edge seal 1111 can be arranged on a side of the bottom wall 1113 facing the other membrane portion 111, and the edge seals 1111 of the two membrane portions 111 can be abutted and matched. The edge seal 1111 cooperates with the side wall 1112 and the bottom wall 1113 to enclose a receiving groove that is open on one side in the first direction. The bottom wall 1113 can form a groove bottom wall 1113 surface of the receiving groove, and the side wall 1112 can form an inner side wall 1112 surface of the receiving groove. The openings of the receiving grooves of the two membrane parts 111 are opposite to each other along the first direction, so that the side walls 1112 of the two membrane parts 111 cooperate to form the inner side wall 1112 surface of the receiving cavity, and the two bottom walls 1113 respectively form two groove bottom walls 1113 surfaces of the receiving cavity in the first direction. At least a portion of the electrode assembly is disposed in the receiving groove, which means that at least a portion of the electrode assembly is disposed in a single receiving groove, and the electrode assembly is arranged in the receiving cavity formed by the cooperation of the two receiving grooves.

[0205] When the soft-pack battery cell 10 is processed, the two film parts 111 can seal the accommodating cavity through the edge sealing 1111. For example, the edge sealing 1111 of the two film parts 111 arranged opposite to each other along the first direction can be connected by hot pressing, so that the circumference of the accommodating cavity is sealed.

[0206] In this embodiment, the membrane portion 111 includes a sealing edge 1111 , a side wall 1112 and a bottom wall 1113 , and has a simple structure, which can well meet the molding requirements of the accommodating groove and the accommodating cavity, so that the processing of the membrane shell 11 can proceed smoothly, meeting the processing and manufacturing requirements of the soft-pack battery cell 10 .

[0207] In one embodiment of the present application, Figure 4 As shown, the side wall 1112 may include a first arc segment 11121, a straight segment 11122 and a second arc segment 11123 connected in sequence along a first direction, the straight segment 11122 extends in a straight line in the first direction, the straight segment 11122 is connected to the arc of the edge sealing 1111 through the first arc segment 11121, and the straight segment 11122 is connected to the arc of the bottom wall 1113 through the second arc segment 11123.

[0208] In this embodiment, the side wall 1112 includes a first arc segment 11121, a straight segment 11122 and a second arc segment 11123 which are sequentially connected along a first direction. The straight segment 11122 extends linearly along the first direction and is connected to the arc of the edge seal 1111 through the first arc segment 11121, and is connected to the arc of the bottom wall 1113 through the second arc segment 11123. That is, the side wall 1112 and the edge seal 1111 can be connected with chamfered corners, and the side wall 1112 and the bottom wall 1113 can also be connected with chamfered corners. When the electrode assembly is assembled into the receiving groove, the electrode assembly can be moved from the opening of the receiving groove to the inside of the receiving groove along the depth direction of the receiving groove.

[0209] In this embodiment, the side wall 1112 is provided with a straight section 11122 extending along the first direction, which can play a good guiding role in the mobile assembly of the electrode assembly and facilitate the arrangement of the electrode assembly in the receiving slot, so that the space of the receiving slot can be more fully utilized. The first arc segment 11121 and the second arc segment 11123 can cooperate with the first straight section 11122 to play a good guiding role, reducing the probability of scratch damage when the electrode assembly is installed into the receiving slot, so that the assembled soft-pack battery cell 10 can operate stably.

[0210] In some examples of this application, reference Figure 4 As shown, the dimension of the straight line segment 11122 in the first direction is the third dimension, and the ratio of the third dimension to the second dimension may be greater than or equal to 0.6 and less than or equal to 0.9.

[0211] In this embodiment, the ratio of the third dimension of the straight line segment 11122 in the first direction to the second dimension is set to be greater than or equal to 0.6 and less than or equal to 0.9. Figure 4 As shown in the figure, d3 is represented as the third size, and the ratio of d3 to d2 can be 0.6, 0.65, 0.7, 0.8, 0.9 and so on.

[0212] In this embodiment, by setting the ratio of the third dimension of the straight line segment 11122 in the first direction to the second dimension to be greater than or equal to 0.6 and less than or equal to 0.9, the side wall 1112 of the receiving groove in the first direction formed by the straight line segment 11122 occupies a larger proportion of the receiving groove space, so that when the electrode assembly is arranged in the receiving groove, the space in the receiving groove can be more fully utilized, and the arrangement of the electrode assembly and the membrane shell 11 can be more compact, thereby further improving the energy density of the soft-pack battery cell 10 to a certain extent.

[0213] In one example of this application, reference Figure 4 As shown, the ratio of the third dimension to the second dimension may be greater than or equal to 0.7 and less than or equal to 0.85.

[0214] In this embodiment, the ratio of the third dimension to the second dimension is further limited to be greater than or equal to 0.7 and less than or equal to 0.85. For example, the ratio of d3 to d2 can be 0.7, 0.71, 0.73, 0.78, 0.85, etc.

[0215] In this embodiment, the ratio of the third dimension to the second dimension is set to be greater than or equal to 0.7 and less than or equal to 0.85, so that the accommodating groove has a larger accommodating space surrounded by a straight line segment 11122 in the first direction so that the space of the accommodating groove can be more fully utilized, and the first arc segment 11121 and the second arc segment 11123 form a good and smooth transition section between the straight line segment 11122 and the edge sealing 1111 and the bottom wall 1113, so that the assembly of the electrode assembly and the membrane shell 11 is smoother and more convenient.

[0216] In some examples of this application, reference Figure 4 As shown, the dimension of the straight line segment 11122 in the first direction is the third dimension, and the third dimension can be greater than or equal to 5 mm and less than or equal to 30 mm.

[0217] In this embodiment, the third dimension is set to be greater than or equal to 5 mm and less than or equal to 30 mm. For example, d3 can be 5 mm, 6 mm, 6.5 mm, 7 mm, 8 mm, 10 mm, 15 mm, 17 mm, 21 mm, 25 mm, 30 mm, etc.

[0218] In this embodiment, the third dimension of the straight line segment 11122 along the first direction is set to be greater than or equal to 5 mm and less than or equal to 30 mm, which can meet the setting requirements of different thicknesses of the soft-pack battery cell 10, so that the dimension of the membrane shell 11 formed by the two membrane parts 111 in the first direction can meet the thickness requirements of the battery cell.

[0219] In one example of this application, reference Figure 4 As shown, the third dimension may be greater than or equal to 7 mm and less than or equal to 18 mm.

[0220] In this embodiment, the third dimension is set to be greater than or equal to 7 mm and less than or equal to 18 mm. For example, d3 can be 7 mm, 8 mm, 10 mm, 12 mm, 13 mm, 18 mm, etc.

[0221] In this embodiment, the third dimension is further limited to be greater than or equal to 7 mm and less than or equal to 18 mm, so that the thickness of the membrane shell 11 can be within a more suitable range, thereby meeting the thickness requirement of the soft-pack battery cell 10 .

[0222] In some examples of the present application, the radius of the first arc segment 11121 may be greater than or equal to 1.5 mm, and the radius of the second arc segment 11123 may be greater than or equal to 1.5 mm.

[0223] In this embodiment, the radius of the first arc segment 11121 is greater than or equal to 1.5 mm, and the radius of the second arc segment 11123 is greater than or equal to 1.5 mm. For example, the radius of the first arc segment 11121 can be 1.5 mm, 1.6 mm, 1.7 mm, 2 mm, 3 mm, etc., and the radius of the second arc segment 11123 can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 2 mm, 3 mm, etc.

[0224] In this embodiment, the radius of the first arc segment 11121 is set to be greater than or equal to 1.5 mm, and the radius of the second arc segment 11123 is set to be greater than or equal to 1.5 mm, so that transition arc segments of sufficient size can be formed between the straight line segment 11122 and the edge seal 1111 and between the straight line segment 11122 and the bottom wall 1113, thereby making the connection between the straight line segment 11122 and the bottom wall 1113 and the edge seal 1111 more stable and reliable, and enabling the first arc segment 11121 and the second arc segment 11123 to play a better guiding role.

[0225] In some embodiments of the present application, reference Figure 5 As shown, the soft pack battery cell 10 is in the second direction (eg Figure 5 The width dimension (in the z direction shown) can be less than or equal to 200 mm.

[0226] In this embodiment, the width of the soft-pack battery cell 10 in the second direction is less than or equal to 200 mm. Figure 5 As shown in the figure, h1 represents the width dimension of the soft-pack battery cell 10 in the second direction, and h1 can be 200mm, 180mm, 170mm, 165mm, 150mm, 120mm, etc.

[0227] In this embodiment, the width dimension of the soft-pack battery cell 10 in the second direction is set to be less than or equal to 200 mm, so that the soft-pack battery cell 10 has a smaller dimension in the second direction while meeting the energy density requirements of the battery device 100, thereby making the overall dimension of the battery device 100 in the second direction smaller and the overall structure of the battery device 100 relatively flat, so that the battery device 100 is more convenient and easier to arrange in an electrical device 1000 such as a vehicle and an energy storage device.

[0228] In some embodiments of the present application, reference Figure 5 As shown, the soft pack battery cell 10 is in the third direction (eg Figure 5 The length dimension (in the y direction shown) can be less than or equal to 650 mm.

[0229] In this embodiment, the length dimension of the soft-pack battery cell 10 in the third direction is set to be less than or equal to 650 mm. Figure 5 As shown in the figure, L1 represents the width dimension of the soft-pack battery cell 10 in the second direction, and L1 can be 650mm, 640mm, 630mm, 600mm, 550mm, etc.

[0230] In this embodiment, the length dimension of the soft-pack battery cell 10 in the third direction is set to be less than or equal to 650 mm, so that the soft-pack battery cell 10 can have a stable structural state while meeting the energy density requirements of the battery device 100, reducing the probability of problems such as mechanical stress caused by the soft-pack battery cell 10 being too long, and allowing the soft-pack battery cell 10 to operate stably and reliably.

[0231] In some embodiments of the present application, reference Figure 5 As shown, the width dimension of the soft-pack battery cell 10 in the second direction may be less than or equal to 200 mm, and the length dimension of the soft-pack battery cell 10 in the third direction may be less than or equal to 650 mm, and the third direction intersects the second direction and the first direction in pairs.

[0232] In this embodiment, the width dimension of the soft-pack battery cell 10 in the second direction is less than or equal to 200 mm, for example, h1 can be 200 mm, 180 mm, 170 mm, 165 mm, 150 mm, 120 mm, etc., and the length dimension of the soft-pack battery cell 10 in the third direction is set to be less than or equal to 650 mm, for example, L1 can be 650 mm, 640 mm, 630 mm, 600 mm, 550 mm, etc.

[0233] The third direction intersects the second direction and the first direction in pairs, which is intended to indicate that the first direction and the second direction can be arranged vertically or only intersecting non-vertically, that is, intersecting at an acute angle or an obtuse angle. For example, the first direction and the second direction can be arranged at an angle of 30°, 60°, 80°, 120°, 150° or 170°, the first direction and the third direction can be arranged vertically or only intersecting non-vertically, that is, intersecting at an acute angle or an obtuse angle. For example, the first direction and the third direction can be arranged at an angle of 30°, 60°, 80°, 120°, 150° or 170°, the second direction and the third direction can be arranged vertically or only intersecting non-vertically, that is, intersecting at an acute angle or an obtuse angle. For example, the second direction and the third direction can be arranged at an angle of 30°, 60°, 80°, 120°, 150° or 170°.

[0234] In this embodiment, by setting the width dimension of the soft-pack battery cell 10 in the second direction to be less than or equal to 200 mm, and setting the length dimension of the soft-pack battery cell 10 in the third direction to be less than or equal to 650 mm, the soft-pack battery cell 10 can have a smaller arrangement space in the second direction while meeting the energy density requirements of the battery device 100 and the overall structure remains stable, thereby making the battery device 100 more convenient to arrange and more stable in operation.

[0235] In some embodiments of the present application, Figure 2 and Figure 4 As shown, the end surface of at least one end of the membrane shell 11 in the second direction may be formed with an edge sealing boss 1101, and the edge sealing boss 1101 is configured to be formed by folding the edge sealing 1111 of the two membrane parts 111, and the second direction intersects with the first direction.

[0236] In this embodiment, the membrane shell 11 is formed with an edge-sealing boss 1101 on the end surface of at least one end in the second direction. For example, in the second direction, the membrane shell 11 may be formed with an edge-sealing boss 1101 on one end surface, or the membrane shell 11 may be formed with edge-sealing bosses 1101 on both end surfaces. The edge-sealing boss 1101 is configured to be formed by folding the edge-sealing 1111 of the two membrane parts 111. After the two membrane parts 111 cooperate to form the membrane shell 11 and heat-press the edge-sealing 1111, the edge-sealing 1111 of the two membrane parts 111 are heat-pressed into one. The integrated edge-sealing 1111 may be formed into the edge-sealing boss 1101 by folding or rolling, and the edge-sealing boss 1101 may not exceed the bottom wall 1113 of the two membrane parts 111 in the first direction.

[0237] When the soft-pack battery cell 10 is arranged in the battery device 100, when the two end faces of the soft-pack battery cell 10 in the second direction are assembled with supporting components or electrical connectors, the size of the edge sealing boss 1101 in the second direction is much smaller than the size of the unfolded edge sealing 1111, and the size of the edge sealing boss 1101 folded from the edge sealing 1111 in the second direction is so small that it can be ignored, so that the two end faces of the soft-pack battery cell 10 can be well coordinated with supporting components for assembly and arrangement, making it convenient and easy to arrange the soft-pack battery cell 10.

[0238] In this embodiment, a sealing boss 1101 is formed on the end surface of at least one end of the membrane shell 11 in the second direction, which can effectively reduce the space occupied by the sealing boss 1111 in the second direction and the interference caused to the arrangement of the soft-pack battery cell 10, so that the overall size of the soft-pack battery cell 10 in the second direction is smaller, which is convenient for the arrangement of the soft-pack battery cell 10 in the battery device 100, and the sealing boss 1101 can improve the sealing reliability of the accommodating cavity to a certain extent, so that the soft-pack battery cell 10 has a more stable sealing effect.

[0239] In one embodiment of the present application, the protrusion height of the edge sealing boss 1101 in the second direction may be less than or equal to 0.5 mm.

[0240] In this embodiment, the protrusion height of the edge sealing boss 1101 in the second direction is less than or equal to 0.5 mm, where the protrusion height refers to the distance dimension away from the end face of the soft-pack battery cell 10 along the second direction. For example, the protrusion height of the edge sealing boss 1101 in the second direction can be 0.5 mm, 0.4 mm, 0.35 mm, 0.34 mm, 0.3 mm, 0.2 mm, etc.

[0241] In this embodiment, the protrusion height of the edge sealing boss 1101 in the second direction is set to be less than or equal to 0.5 mm, so that the protrusion size of the edge sealing boss 1101 on the soft-pack battery cell 10 is very small, so that the end of the soft-pack battery cell 10 with the edge sealing boss 1101 in the second direction can still be conveniently matched with the assembly of supporting and fixing structures, making it more convenient and easy to assemble the soft-pack battery cell 10 in the battery device 100.

[0242] In some embodiments of the present application, Figure 1 As shown, the two ends of the soft-pack battery cell 10 in the third direction may respectively have a conductive member 12 , the conductive member 12 is electrically connected to the electrode assembly and at least partially exposed outside the membrane shell 11 , and the third direction intersects with the first direction.

[0243] In this embodiment, the soft-pack battery cell 10 has conductive members 12 at both ends of the third direction, the conductive members 12 are electrically connected to the electrode assembly and at least partially exposed outside the membrane shell 11. By way of example, the conductive members 12 arranged at both ends of the soft-pack battery cell 10 along the third direction can be respectively connected to the positive electrode tab and the negative electrode tab in the electrode assembly, and the soft-pack battery cell 10 can supply power to the outside or charge the soft-pack battery cell 10 externally through the two conductive members 12.

[0244] In this embodiment, conductive members 12 are respectively provided at both ends of the soft-pack battery cell 10 in the third direction. The conductive members 12 are electrically connected to the electrode assembly, and the structure is simple, which can well meet the use requirements of the soft-pack battery cell 10 .

[0245] In one embodiment of the present application, reference Figure 1 and Figure 2 As shown, the portion of the conductive member 12 exposed outside the membrane shell 11 may be a lead-out portion, and the lead-out portion is formed in a sheet shape.

[0246] In this embodiment, the portion of the conductive member 12 exposed outside the membrane shell 11 is a lead-out portion, which is in a sheet shape. The thickness direction of the lead-out portion can be the same as the second direction. When multiple soft-pack battery cells 10 are arranged along the first direction, the multiple soft-pack battery cells 10 can be electrically connected through the conductive portion as needed.

[0247] In this embodiment, the lead-out portion is configured in a sheet shape so that the lead-out portion can have a larger electrical connection surface, and the lead-out portion can be conveniently and reliably electrically connected to other electrical connectors or conductive members 12 .

[0248] In some examples of this application, reference Figure 1 and Figure 2 As shown, both side end surfaces of the lead-out portion in the second direction and the end surface of the lead-out portion in the third direction away from the electrode assembly may form rounded corners.

[0249] In this embodiment, the end faces of the lead-out part on both sides in the second direction are chamfered with the end face of the lead-out part in the third direction that is away from the electrode assembly. In other words, the two end corners of the lead-out part in the second direction that are away from the electrode assembly along the third direction are chamfered, and a rounded transition is formed between the end face of the lead-out part that is away from the electrode assembly and the two end faces of the lead-out part in the second direction.

[0250] In this embodiment, the end faces of the lead-out part on both sides in the second direction and the end face of the lead-out part at one end away from the electrode assembly in the third direction are respectively chamfered, which can effectively disperse the stress on the lead-out part and reduce the risk of scratches on the soft-pack battery cell 10 and the operator due to the presence of sharp edges of the lead-out part, so that the lead-out part can be electrically connected more conveniently and stably.

[0251] In one embodiment of the present application, reference Figure 1 and Figure 2 As shown, the portion of the conductive member 12 exposed outside the membrane shell 11 is a lead-out portion, and the lead-out portion may be a flexible structure.

[0252] In this embodiment, the lead-out portion of the conductive member 12 is configured as a flexible structure, for example, the lead-out portion may be a flexible copper foil, a nickel-plated copper tape, or a flexible conductive polymer, and the like.

[0253] In this embodiment, the lead-out portion is set as a flexible structure, which can make the lead-out portion more convenient for electrical connection and can better adapt to the electrical connection needs of different angles and directions, so that the soft-pack battery cell 10 is more convenient and reliable when electrically connected to other soft-pack battery cells 10 or external circuits.

[0254] In one embodiment of the present application, reference Figure 4 As shown, the portion of the conductive member 12 exposed outside the membrane shell 11 is the lead-out portion, and the thickness of the lead-out portion may be 0.1 mm to 0.5 mm.

[0255] In this embodiment, the thickness of the lead-out portion is set to be greater than or equal to 0.1 mm and less than or equal to 0.5 mm. Figure 4 As shown in the figure, d4 represents the thickness of the lead-out portion, and d4 can be 0.1mm, 0.2mm, 0.25mm, 0.3mm, 0.5mm, etc.

[0256] In this embodiment, the thickness of the lead-out portion is set to 0.1mm~0.5mm, so that the lead-out portion can have sufficient flow area to meet the needs of electrical connection, and the lead-out portion has sufficient mechanical strength to stably and reliably make electrical connections, and reduces the probability of problems such as inconvenient connection and increased cost caused by the lead-out portion being too thick, so that the lead-out portion can be stably and conveniently electrically connected.

[0257] In one embodiment of the present application, reference Figure 5 As shown, the portion of the conductive member 12 exposed outside the membrane shell 11 is a lead-out portion, and the width of the lead-out portion in the second direction may be 20 mm to 60 mm.

[0258] In this embodiment, the width of the lead-out portion in the second direction is set to be greater than or equal to 20 mm and less than or equal to 60 mm. Figure 5 As shown in the figure, h2 represents the width dimension of the lead-out portion in the second direction, and h2 can be 20mm, 23mm, 25mm, 26mm, 30mm, 35mm, 45mm, 50mm, 55mm, 60mm, etc.

[0259] In this embodiment, the width dimension of the lead-out portion in the second direction is set to 20mm-60mm, so that the lead-out portion can have sufficient size in the second direction for convenient electrical connection operations, and the probability of the lead-out portion being too wide and difficult to bend, causing inconvenience in electrical connection operations, is reduced, thereby allowing the lead-out portion to be flexibly and conveniently electrically connected.

[0260] In one embodiment of the present application, reference Figure 5 As shown, the portion of the conductive member 12 exposed outside the membrane shell 11 is a lead-out portion, and the length of the lead-out portion in the third direction may be 10 mm to 50 mm.

[0261] In this embodiment, the length of the lead-out portion in the third direction is set to 10 mm to 50 mm. Figure 5 As shown in the figure, L2 represents the length dimension of the lead-out portion in the third direction, and L2 can be 10mm, 12mm, 15mm, 20mm, 25mm, 30mm, 40mm, 50mm, etc.

[0262] In this embodiment, the length dimension of the lead-out portion in the third direction is set to be greater than or equal to 10 mm, so that the lead-out portion can have sufficient length for electrical connection. The length dimension of the lead-out portion in the third direction is set to be less than or equal to 50 mm, which can reduce the cost increase and space occupation caused by the excessive length of the lead-out portion, and make the overall structure of the soft-pack battery cell 10 more compact.

[0263] Reference below Figure 1-Figure 16 A battery device 100 according to an embodiment of the second aspect of the present application is described.

[0264] like Figure 1-Figure 16 As shown, the battery device 100 according to the embodiment of the present application includes a battery cell group, which includes a plurality of soft-pack battery cells 10 stacked and arranged along a first direction. The soft-pack battery cells 10 are the soft-pack battery cells 10 according to the embodiment of the first aspect of the present application.

[0265] According to the battery device 100 of the embodiment of the present application, by setting the soft-pack battery cell 10 of the first embodiment, by setting the thickness of the membrane shell 11 to be less than 0.2 mm, and the first dimension to be greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery cell 10 has a larger thickness and the wall thickness of the membrane shell 11 is smaller, so that the soft-pack battery cell 10 has a higher energy density. At the same time, the ratio of the second dimension to the first dimension of any membrane portion 111 is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions 111 of the membrane shell 11 have similar or identical size structures and structural properties, so that the two membranes The portion 111 can have a relatively balanced bearing capacity for the stress generated in the accommodating cavity, so that the overall structure of the membrane shell 11 is more stable and the structural performance such as mechanical strength is better, so that the membrane shell 11 can well meet the support and protection needs of the soft-pack battery cell 10 when the thickness is large under the condition that the wall thickness is less than or equal to 0.2 mm, thereby stably and reliably improving the energy density of the soft-pack battery cell 10, thereby reducing the number of structural components such as support and heat conduction in the battery device 100, and increasing the arrangement space of the soft-pack battery cell 10 in the battery device 100, so that the overall energy density of the battery device 100 is greatly improved.

[0266] In some embodiments of the present application, Figure 7 and Figure 8 As shown, the battery device 100 may further include: a heat exchange plate 50, which is disposed on at least one side of the plurality of soft-pack battery cells 10 in the second direction for heat exchange with the plurality of soft-pack battery cells 10, and the second direction intersects with the first direction.

[0267] In this embodiment, the battery device 100 also includes a heat exchange plate 50, which can be a liquid cooling plate. The heat exchange plate 50 is arranged on at least one side of the multiple soft-pack battery cells 10 in the second direction. For example, the heat exchange plate 50 can be arranged on one side of the multiple soft-pack battery cells 10 in the second direction. The heat exchange plate 50 can also be arranged on both sides of the multiple soft-pack battery cells 10 in the second direction. When the battery device 100 is operating, the heat generated by the multiple soft-pack battery cells 10 in the battery cell group during operation is dissipated through the heat exchange plate 50. When the battery cell group needs to be heated, the heat exchange plate 50 can transfer the heat to the soft-pack battery cells 10 in the battery cell group.

[0268] In this embodiment, a heat exchange plate 50 is provided, and the heat exchange plate 50 is arranged on at least one side of the plurality of soft-pack battery cells 10 in the second direction. The structure is simple and the arrangement is reasonable, so that the heat exchange plate 50 can conveniently perform heat exchange with the plurality of soft-pack battery cells 10, so that the battery cell group can obtain a good heat exchange effect, so that the battery cell group can operate stably and reliably, and thus the battery device 100 can operate more stably.

[0269] In one embodiment of the present application, reference Fig. 9 and Fig.10 As shown, the surface of the membrane shell 11 on one side facing the heat exchange plate 50 in the second direction may be a plane, and is connected to the heat exchange plate 50 via a heat conductive adhesive or a heat conductive pad.

[0270] The side surface of the membrane shell 11 facing the heat exchange plate 50 in the second direction is flat, that is, the side surface of the membrane shell 11 facing the heat exchange plate 50 is not formed with an edge sealing boss 1101. By way of example, during the processing and forming of the membrane shell 11, the portion where the two membrane portions 111 are connected can form a side surface of the membrane shell 11 in the second direction after the two membrane portions 111 are folded in half. The side surface can be formed by directly connecting and matching the side walls 1112 of the two membrane portions 111, so there is no need to leave an edge sealing 1111. After the membrane shell 11 is folded in half, the side walls 1112 of the two membrane portions 111 cooperate to form the peripheral wall structure of the membrane shell 11 in the second and third directions. The edge sealing 1111 of the two membrane portions 111 closes the accommodating cavity in the circumferential direction of the membrane shell 11 and seals the conductive part 12 by hot pressing or the like.

[0271] The side surface of the membrane shell 11 facing the heat exchange plate 50 is connected to the heat exchange plate 50 through a thermally conductive adhesive or a thermally conductive pad. For example, the thermally conductive adhesive can be a thermally conductive structural adhesive, and the thermally conductive pad can be a rubber pad, etc. When the battery cell group and the heat exchange plate 50 are assembled, the thermally conductive adhesive or the thermally conductive pad can be pre-applied to the side surface of the heat exchange plate 50 that cooperates with the membrane shell 11, and the battery cell group can be arranged as a whole on the heat exchange plate 50 and fixedly connected to the heat exchange plate 50 through the thermally conductive adhesive or the thermally conductive pad.

[0272] In the present embodiment, the surface of one side of the membrane shell 11 facing the heat exchange plate 50 is set to be a plane, which has a simple structure and can make the membrane shell 11 and the heat exchange plate 50 have a stable matching contact surface, so that the membrane shell 11 can be stably and reliably fixed to the heat exchange plate 50 through thermal conductive glue or thermal conductive pads, thereby making the assembly and fixation of the soft-pack battery cell 10 on the heat exchange plate 50 more convenient and stable, and making the assembly and fixation of the battery cell group and the heat exchange plate 50 more reliable.

[0273] In one embodiment of the present application, reference Figure 8 and Fig.10 As shown, a sealing boss 1101 may be formed on one side of the membrane shell 11 in the second direction, and the battery device 100 may further include: an adhesive layer 40, the adhesive layer 40 is adhesively connected between the heat exchange plate 50 and the soft-pack battery cell 10, wherein in the second direction, the height of the adhesive layer 40 is greater than the protruding height of the sealing boss 1101.

[0274] In this embodiment, the membrane shell 11 forms an edge sealing boss 1101 on one side in the second direction, and the adhesive layer 40 provided in the battery device 100 is connected between the heat exchange plate 50 and the soft-pack battery cell 10. Exemplarily, the adhesive layer 40 can be a glue layer, such as a thermally conductive structural glue layer, and the height of the adhesive layer 40 in the second direction is greater than the protruding height of the edge sealing boss 1101. When the side of the membrane shell 11 having the edge sealing boss 1101 is fixed to the heat exchange plate 50, since the height of the adhesive layer 40 is greater than the protruding height of the closed boss, the edge sealing boss 1101 on the membrane shell 11 can be arranged in the adhesive layer 40, and the outer surface of the edge sealing boss 1101 and the end face of the membrane shell 11 facing the heat exchange plate 50 are both in contact and adhered to the adhesive layer 40.

[0275] In this embodiment, one side of the membrane shell 11 having the edge sealing boss 1101 is bonded to the heat exchange plate 50 through the adhesive layer 40. The height of the adhesive layer 40 is greater than the protruding height of the edge sealing boss 1101, so that the adhesive layer 40 can fully cover the gap between the end face of the membrane shell 11 and the heat exchange plate 50, so that the membrane shell 11 can be reliably and stably bonded and fixed to the heat exchange plate 50 through the adhesive layer 40, so that the battery cell group can be stably and reliably assembled and fixed to the heat exchange plate 50.

[0276] In one embodiment of the present application, reference Figure 8 As shown, the battery device 100 may further include: an adhesive layer 40, the adhesive layer 40 is adhesively connected between the heat exchange plate 50 and the soft-pack battery cell 10, and a portion of the adhesive layer 40 is configured to overflow between two adjacent soft-pack battery cells 10 in a first direction to adhesively connect the two adjacent soft-pack battery cells 10.

[0277] In this embodiment, a portion of the adhesive layer 40 overflows between two adjacent soft-pack battery cells 10 in the first direction, and adheres the two connected soft-pack battery cells 10. Exemplarily, for a soft-pack battery cell 10 in the battery cell group, after the battery cell group is bonded and fixed to the heat exchange plate 50, the side surface of the soft-pack battery cell 10 facing the heat exchange plate 50 in the second direction is bonded and fixed to the heat exchange plate 50, and the two side surfaces of the soft-pack battery cell 10 in the first direction are connected to the adjacent soft-pack battery cells 10 through the overflowed colloid, and the two side surfaces of the soft-pack battery cell 10 in the first direction are adhered to the heat exchange plate 50 through the overflowed colloid.

[0278] In the present embodiment, a portion of the adhesive layer 40 is configured to overflow between two adjacent soft-pack battery cells 10 in the first direction, so that the two adjacent soft-pack battery cells 10 can be better connected and fixed at the end facing the heat exchange plate 50, so that the overall arrangement of the multiple soft-pack battery cells 10 in the battery cell group is more stable, and the bonding connection area between the soft-pack battery cell 10 and the heat exchange plate 50 through the adhesive layer 40 is greatly increased, so that the bonding and fixation of the soft-pack battery cell 10 and the heat exchange plate 50 is more stable, thereby making the battery cell group and the heat exchange plate 50 more firmly and stably fixed.

[0279] In some embodiments of the present application, the battery device 100 may further include a base plate and an adhesive layer 40, the base plate is located on one side of the battery cell group in the second direction, the battery cell group and the base plate are adhesively connected by the adhesive layer 40, the surface of the soft-pack battery cell 10 facing the adhesive layer 40 is the first surface, and the two side surfaces of the soft-pack battery cell 10 in the first direction are both second surfaces, and the first surface is connected to the two second surfaces by chamfers, wherein the battery device 100 also includes a blocking member 80, the blocking member 80 is arranged at the chamfer, and the blocking member 80 is configured to prevent the adhesive layer 40 located at the chamfer from overflowing to the position of the second surface.

[0280] In this embodiment, the battery device 100 is provided with a bottom plate and an adhesive layer 40, the battery cell group and the bottom plate are adhesively connected by the adhesive layer 40, the bottom plate can be a part of the box body 60 of the battery device 100, and the ends of the multiple soft-pack battery cells 10 in the battery cell group facing the bottom plate can be adhesively fixed to the bottom plate by the adhesive layer 40, wherein the surface of the side of the soft-pack battery cell 10 facing the adhesive layer 40 is the first surface, that is, the first surface of the soft-pack battery cell 10 is adhesively fixed to the adhesive layer 40, refer to Figure 2 and Figure 5 As shown, the first surface can be a side surface of the side wall 1112 of the two membrane portions 111 of the soft-pack battery cell 10 facing the adhesive layer 40. Specifically, the first surface can be a side surface of the straight line segment 11122 of the side wall 1112 facing the adhesive layer 40. The second surface of the soft-pack battery cell 10 can be an outer surface of the bottom wall 1113 of the membrane portion 111 in the first direction, and the chamfer between the first surface and the two second surfaces can be the second arc segment 11123 of the side wall 1112.

[0281] In this embodiment, a blocking member 80 is provided at the chamfer, and the blocking member 80 is configured to block the adhesive layer 40 at the chamfer from overflowing to the position of the second surface, that is, to block the colloid of the adhesive layer 40 from overflowing between the adjacent second surfaces of two adjacent soft-pack battery cells 10. After the battery device 100 is assembled, two adjacent chamfers of two adjacent soft-pack battery cells 10 form a certain gap in the first direction, and the colloid of the adhesive layer 40 will overflow into the gap between the two chamfers and be bonded to the surfaces of the two chamfers, thereby bonding the two adjacent soft-pack battery cells 10. When the colloid continues to overflow toward the second surface along the second direction, the blocking member 80 blocks the overflow of the colloid.

[0282] In this embodiment, a blocking member 80 is provided at the chamfer to block the overflow of the adhesive layer 40 toward the second surface, which can effectively reduce the probability that the colloid in the adhesive layer 40 overflows to the second surfaces of adjacent soft-pack battery cells 10 when the battery cell group and the bottom plate are bonded and assembled through the adhesive layer 40, thereby effectively reducing the risk of damage to the soft-pack battery cells 10 caused by stress concentration generated by the overflowing colloid, so that the soft-pack battery cells 10 can maintain a stable structural state and service life.

[0283] In one embodiment of the present application, in the first direction, a blocking member 80 may be disposed between two adjacent soft-pack battery cells 10 .

[0284] In this embodiment, a blocking member 80 is arranged between two adjacent soft-pack battery cells 10. For example, the blocking member 80 can be connected to the chamfered surfaces of two adjacent chamfers in a first direction to separate the two chamfers from the two first surfaces in a second direction, and further separate the two adjacent first surfaces from the overflowing colloid at the two chamfers. The blocking member 80 can also be directly arranged between the two adjacent first surfaces and located at one end where the first surface is connected to the chamfer. The blocking member 80 is fittedly connected to the two first surfaces to prevent the overflowing colloid at the chamfer from further overflowing between the two adjacent soft-pack battery cells 10.

[0285] In this embodiment, a blocking member 80 is disposed between two adjacent soft-pack battery cells 10 , which makes it easier to arrange the blocking member 80 and reduces the number of blocking members 80 used, thereby reducing the cost of the battery device 100 to a certain extent.

[0286] In one embodiment of the present application, the blocking member 80 may be a foam member, and the blocking member 80 is bonded to the bottom plate.

[0287] In this embodiment, the blocking member 80 is configured as a foam member. The foam member is light in weight and has good cushioning properties and is easy to process and shape. When the foam member is bonded to the bottom plate and assembled at the chamfer, the foam member can abut and fit with the surface of the soft-pack battery cell 10 through a certain deformation, or the foam member can fill the gap between adjacent soft-pack battery cells 10 as needed.

[0288] In this embodiment, the blocking member 80 is configured as a foam member and is bonded to the bottom plate, which has a simple structure, so that the blocking member 80 can be conveniently arranged at the chamfer and stably separate the overflow colloid of the adhesive layer 40, and is easy to assemble.

[0289] In one embodiment of the present application, the blocking member 80 may be an adhesive member, and the adhesive member is adhesively connected to one end of the soft-pack battery cell 10 facing the bottom plate.

[0290] In this embodiment, the blocking member 80 is an adhesive member, for example, the blocking member 80 can be an adhesive strip, the adhesive member is bonded and connected to the soft-pack battery cell 10, and the adhesive member can be set in the form of a single-sided adhesive. Exemplarily, when the battery device 100 is assembled, the adhesive member can be bonded and fixed to the corresponding position of the soft-pack battery cell 10 before the battery cell group and the bottom plate are bonded and fixed by the adhesive layer 40, so as to separate and block the gap between adjacent soft-pack battery cells 10, the gap between two adjacent first surfaces, and the gap between two adjacent chamfers. When the battery device 100 and the adhesive member are bonded to the adhesive layer 40 as a whole, the adhesive member blocks the adhesive layer 40 at the chamfer.

[0291] In this embodiment, the blocking member 80 is configured as an adhesive member, which has a simple structure and can well meet the use requirements, making it more convenient to assemble and fix the blocking member 80 and the soft-pack battery unit 10.

[0292] In some embodiments of the present application, Figure 8 As shown, multiple soft-pack battery cells 10 are stacked along a first direction, and the battery device 100 may further include a partition 20, the hardness of the partition 20 is higher than that of the membrane shell 11, the number of the partitions 20 is multiple, and the multiple partitions 20 are arranged at intervals in the first direction, and at least two soft-pack battery cells 10 are arranged between two adjacent partitions 20.

[0293] In this embodiment, the battery device 100 also includes a partition 20, which is multiple and arranged at intervals in the first direction. For example, the number of the partitions 20 can be two, three, four, five, six, seven, etc. At least two soft-pack battery cells 10 are arranged between two adjacent partitions 20. For example, two, three, four, etc. soft-pack battery cells 10 can be arranged between two adjacent partitions 20.

[0294] In the present embodiment, a plurality of partitions 20 are arranged at intervals in the first direction, and soft-pack battery cells 10 are arranged between adjacent partitions 20, and the hardness of the partitions 20 is greater than the hardness of the membrane shell 11, so that when the plurality of soft-pack battery cells 10 are arranged along the first direction, the plurality of partitions 20 can play a good supporting role for the plurality of soft-pack battery cells 10, so that the plurality of soft-pack battery cells 10 can be conveniently and compactly arranged, and the partitions 20 can play a certain separation role, so that the plurality of soft-pack battery cells 10 in the battery cell group can be separated between different partitions 20, so that when some of the soft-pack battery cells 10 fail, for example, when the soft-pack battery cells 10 have thermal runaway, the partitions 20 can play a certain separation role for the soft-pack battery cells 10 with thermal runaway, thereby reducing the impact of thermal runaway on other soft-pack battery cells 10, so that the battery cell group can operate more stably and reliably.

[0295] The hardness of the partition 20 is greater than the hardness of the membrane shell 11, so that when the partition 20 is assembled with multiple soft-pack battery cells 10, the partition 20 can maintain a stable structural state, which greatly reduces the probability of structural damage such as deformation and scratches caused by the membrane shell 11 to the partition 20, so that the partition 20 can stably and reliably support and separate the soft-pack battery cells 10.

[0296] In this embodiment, at least two soft-pack battery cells 10 are arranged between two adjacent partitions 20, so that the number of partitions 20 arranged in the battery cell group can be reduced, so that the partition 20 structure occupies less space in the battery device 100, so that the battery device 100 can maintain a higher energy density to a certain extent.

[0297] In this embodiment, a plurality of partitions 20 are arranged at intervals along a first direction, the hardness of the partitions 20 is greater than the hardness of the membrane shell 11, and at least two soft-pack battery cells 10 are arranged between two adjacent partitions 20, so that the plurality of soft-pack battery cells 10 in the battery cell group can obtain stable and reliable support from the partitions 20 in the first direction, thereby making the overall structure of the battery cell group more stable, and the number of partitions 20 arranged can be reduced, so that the battery device 100 can maintain a higher energy density.

[0298] In one embodiment of the present application, reference Figure 8 and Fig.12 As shown, the number of the soft-pack battery cells 10 sequentially arranged between two adjacent separators 20 along the first direction may be less than or equal to four.

[0299] In this embodiment, the number of soft-pack battery cells between two adjacent separators 20 is less than or equal to four. For example, four, three or two soft-pack battery cells 10 may be arranged between two adjacent separators 20 .

[0300] In the present embodiment, the number of soft-pack battery cells 10 between two adjacent partitions 20 is set to be less than or equal to four, so that the number of soft-pack battery cells 10 arranged between two adjacent partitions 20 is more appropriate, so that each soft-pack battery cell 10 between the two partitions 20 can obtain stable and effective support from the two partitions 20, thereby reducing the probability that the number of soft-pack battery cells 10 between the two partitions 20 is too large and exceeds the supporting capacity of the partition 20, so that multiple partitions 20 can play a stable and reliable supporting role for each soft-pack battery cell 10 in the battery cell group, so that the overall structural stability of the battery cell group is better.

[0301] In one embodiment of the present application, reference Figure 7 and Fig. 9 As shown, the soft-pack battery cell 10 extends along the third direction, which is the length direction of the soft-pack battery cell 10 . The length direction of the separator 20 extends along the length direction of the soft-pack battery cell 10 , and the length of the separator 20 may be greater than 80% of the length of the soft-pack battery cell 10 .

[0302] In this embodiment, the soft-pack battery cell 10 extends along the third direction, and the length direction of the separator 20 extends along the length direction of the soft-pack battery cell 10. In other words, the separator 20 extends along the length direction of the soft-pack battery cell 10, and the length direction of the separator 20 is the same as the length direction of the soft-pack battery cell 10, and the third direction is also the length direction of the separator 20. The length of the separator 20 is greater than 80% of the length of the soft-pack battery cell 10. For example, the length of the separator 20 can be 81%, 82%, 84%, 85%, 90%, 100%, 120%, 150%, 170%, 200%, etc. of the length of the soft-pack battery cell 10.

[0303] In this embodiment, the length of the partition 20 is set to be greater than 80% of the length of the soft-pack battery cell 10, so that the soft-pack battery cell 10 and the partition 20 can have a larger matching support surface, so that the partition 20 can cover most or all of the extension range of the soft-pack battery cell 10 in the third direction, so that the partition 20 can have a good supporting and separating effect on the soft-pack battery cell 10.

[0304] In one embodiment of the present application, reference Figure 7 As shown, the number of cell groups can be multiple, with at least two cell groups arranged in the third direction, and the length of the partition 20 is greater than twice the length of the soft-pack battery cell 10, so that two adjacent cell groups arranged along the length direction of the soft-pack battery cell 10 share a partition 20.

[0305] In the present embodiment, the number of cell groups is set to be multiple, for example, the number of cell groups can be two, three, four, five, six, etc., and the multiple cell groups are arranged in the third direction, and the length of the partition 20 is greater than twice the length of the soft-pack battery cell 10. For example, the length of the partition 20 can be two and a half times, three times, etc., of the length of the soft-pack battery cell 10. Exemplarily, when the length of the partition 20 is greater than twice and less than three times the length of the soft-pack battery cell 10, one partition 20 can be arranged in two cell groups or three cell groups along the third direction, and two adjacent cell groups or three cell groups can share one partition 20.

[0306] In this embodiment, the number of battery cell groups is set to be multiple and arranged in the third direction, which has a simple structure and reasonable arrangement, and can well meet the use requirements of the battery device 100. The length of the partition 20 is set to be greater than twice the length of the soft-pack battery cell 10, so that the partition 20 can support at least two adjacent soft-pack battery cells 10 at the same time, which can reduce the number of partitions 20 arranged, so that the positioning of multiple battery cell groups is more convenient and the arrangement is more consistent when arranged, thereby to a certain extent, the assembly efficiency of the battery device 100 is greatly improved.

[0307] In one embodiment of the present application, reference Fig.12 As shown, the thickness of the separator 20 along the first direction may be less than the thickness of the soft-pack battery cell 10 , and the width of the separator 20 along the second direction may be greater than 80% of the width of the soft-pack battery cell 10 .

[0308] In this embodiment, the width of the partition 20 along the second direction is greater than 80% of the width of the soft-pack battery cell 10. For example, the width of the partition 20 can be 81%, 82%, 84%, 85%, 90%, 100%, 120%, 150%, 170%, 200%, etc. of the width of the soft-pack battery cell 10.

[0309] In the present embodiment, the width of the partition 20 is set to be greater than 80% of the width of the soft-pack battery cell 10, so that the soft-pack battery cell 10 and the partition 20 can form a larger supporting and matching area, so that the partition 20 can cover most of the surface of the soft-pack battery cell 10 on one side in the first direction, so that the partition 20 can have a good supporting and separating effect on the soft-pack battery cell 10.

[0310] In one embodiment of the present application, the thickness of the partition 20 along the first direction may be 0.8 mm to 2.0 mm.

[0311] In this embodiment, the thickness of the partition 20 along the first direction is set to be greater than or equal to 0.8 mm and less than or equal to 2 mm. For example, the thickness of the partition 20 can be 0.8 mm, 0.9 mm, 1 mm, 1.3 mm, 1.5 mm, 2 mm, etc.

[0312] In this embodiment, the thickness of the partition 20 is set to be greater than or equal to 0.8 mm, so that the partition 20 can have good structural strength to stably and reliably support the soft-pack battery cell 10. The thickness of the partition 20 is set to be less than or equal to 2 mm, so that the partition 20 has a thinner thickness while meeting the support requirements, thereby reducing the space occupied by the partition 20 in the battery device 100, thereby allowing the battery device 100 to have a higher energy density.

[0313] In one embodiment of the present application, the partition 20 may be an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate.

[0314] In this embodiment, the partition 20 is set to an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate. The aluminum plate and the aluminum alloy plate have a low density and good thermal conductivity, the copper plate has good mechanical strength and thermal conductivity, and the steel plate has good mechanical strength and durability and good economy.

[0315] In this embodiment, the partition 20 is set to an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate, so that the partition 20 can have good mechanical strength, so that the partition 20 can well meet the support requirements, and the partition 20 has a good thermal conductivity, so that the soft-pack battery cells 10 in the battery cell group can exchange heat through the partition 20, so that the battery cell group can obtain a better heat exchange effect.

[0316] In one embodiment of the present application, the partition 20 may be a solid structure.

[0317] In this embodiment, the partition 20 is configured as a solid structure, that is, the partition 20 does not have any holes, channels or cavities, and the partition 20 is a solid plate structure.

[0318] In this embodiment, the partition 20 is configured as a solid structure, so that the partition 20 can have good mechanical strength and support reliability, so that the multiple soft-pack battery cells 10 in the battery cell group can be supported more stably and reliably.

[0319] In one embodiment of the present application, the partition plate 20 may be a heat conductive member and is thermally connected to the membrane shell 11 .

[0320] In this embodiment, the partition 20 is a heat-conducting component and is thermally connected to the membrane shell 11. For example, the partition 20 can be a plate with thermal conductivity such as a copper plate, an aluminum alloy plate, etc. The partition 20 is thermally connected to the membrane shell 11. For example, the partition 20 and the membrane shell 11 can be thermally connected by a thermally conductive structural adhesive or can be connected and fixed by a double-sided adhesive to achieve heat transfer.

[0321] In this embodiment, the partition 20 is set as a heat conductor, so that the partition 20 can exchange heat with the adjacent soft-pack battery cell 10. When the soft-pack battery cell 10 needs to dissipate heat, the heat can be transferred out through the partition 20. For example, the heat can be conducted out faster through the partition 20. The partition 20 can also be thermally connected to the heat exchange plate 50, so that the heat can be transferred from the partition 20 to the heat exchange plate 50 and conducted out.

[0322] In this embodiment, the partition 20 is configured as a heat conductor and is thermally connected to the membrane shell 11, so that the partition 20 can play a good heat exchange role for the soft-pack battery monomer 10, so that the soft-pack battery monomer 10 can exchange heat through the partition 20 in the first direction, so that the battery cell group can obtain a better heat exchange effect, and the battery device 100 can have better thermal management performance.

[0323] In one embodiment of the present application, a heat exchange channel may be formed in the partition 20 .

[0324] In this embodiment, a heat exchange channel is formed in the partition 20. When the battery cell group is operating, the heat exchange fluid can flow in the heat exchange channel in the partition 20 to perform heat exchange operations on the soft-pack battery cells 10. At the same time, the heat exchange plate 50 performs heat exchange operations on the soft-pack battery cells 10 on one side or both sides of the second direction.

[0325] In this embodiment, a heat exchange flow channel is formed in the partition 20, so that the partition 20 can be used as a liquid cooling plate to perform efficient heat exchange operations on the soft-pack battery monomer 10, so that the heat exchange effect of the partition 20 on the soft-pack battery monomer 10 in the first direction can be greatly improved, so that the battery cell group can obtain a better heat exchange effect, and the battery device 100 can have better thermal management performance. The partition 20 integrates a liquid cooling heat exchange function, which reduces the need for additional heat exchange structures. While improving the heat exchange effect, the number of structural components of the non-soft-pack battery monomer 10 in the battery device 100 is reduced, so that the battery cell group in the battery device 100 can be arranged more compactly, so that the battery device 100 can maintain a higher energy density.

[0326] In one embodiment of the present application, the separator 20 may be bonded to adjacent soft-pack battery cells 10 .

[0327] In this embodiment, the separator 20 is bonded and connected to the adjacent soft-pack battery cells 10 . For example, the separator 20 can be fixed to the adjacent soft-pack battery cells 10 by gluing.

[0328] In this embodiment, the separator 20 is bonded to the adjacent soft-pack battery cell 10 , which has a simple structure and is easy to fix, so that the separator 20 and the soft-pack battery cell 10 can be arranged compactly, thereby making the overall structure of the battery cell group more compact and stable.

[0329] In one embodiment of the present application, the separator 20 may be bonded and fixed to the adjacent soft-pack battery cells 10 by double-sided adhesive.

[0330] In this embodiment, the partition 20 is bonded and fixed to the adjacent soft-pack battery cell 10 by double-sided tape. When the soft-pack battery cell 10 and the partition 20 are assembled, the double-sided tape can be first bonded and fixed to the soft-pack battery cell 10 or the partition 20, and the soft-pack battery cell 10 is then bonded and fixed to the partition 20 by double-sided tape.

[0331] In this embodiment, the separator 20 and the adjacent soft-pack battery cell 10 are bonded and fixed by double-sided adhesive, which has a simple structure and is convenient and reliable to fix.

[0332] In one embodiment of the present application, Figure 8 and Fig.12 As shown, in the first direction, a buffer 30 may be provided between at least two adjacent soft-pack battery cells 10 , and the hardness of the buffer 30 is less than the hardness of the film shell 11 .

[0333] In this embodiment, a buffer 30 is disposed between at least two adjacent soft-pack battery cells 10 , which may mean that in the battery cell group, when a partition 20 is not disposed between any two adjacent soft-pack battery cells 10 in the first direction, a buffer 30 is disposed.

[0334] Exemplarily, since the separators 20 are arranged at intervals in the first direction, at least two soft-pack battery cells 10 are arranged between adjacent separators 20, and the separator 20 can also be arranged between two adjacent soft-pack battery cells 10, then the buffer 30 can be arranged when there is no separator 20 between the two adjacent soft-pack battery cells 10, and the buffer 30 can also be arranged as needed when the separator 20 is arranged between the two adjacent soft-pack battery cells 10. For example, when two soft-pack battery cells 10 are arranged between two separators 20, the buffer 30 can be arranged between the two soft-pack battery cells 10, and the buffer 30 is not arranged at the position where the separator 20 is arranged. At this time, the buffer 30 and the separator 20 can be arranged at intervals or staggered in the first direction. Optionally, the buffer 30 can be a buffer pad.

[0335] In this embodiment, a buffer member 30 is provided between two adjacent soft-pack batteries, and the hardness of the buffer member 30 is less than the hardness of the membrane shell 11, so that the buffer member 30 can well absorb the deformation of the soft-pack battery cell 10 and the vibration under external impact, and can play a good buffering role in the direct contact friction of the adjacent soft-pack battery cell 10 brackets, so that the overall structural stability of the battery cell group is better, so that the battery device 100 can operate more stably and reliably.

[0336] In some examples of this application, reference Figure 8 and Fig.12 As shown, in the first direction, a buffer 30 and a separator 20 may be disposed between at least two adjacent soft-pack battery cells 10 .

[0337] In this embodiment, a buffer 30 and a partition 20 are provided between at least two adjacent soft-pack battery cells 10. For example, the partition 20 can be bonded and fixed to one of the soft-pack battery cells 10 and the buffer 30, and the buffer 30 can be abutted and matched with another soft-pack battery cell 10.

[0338] In this embodiment, a buffer member 30 and a partition 20 are simultaneously arranged between at least two adjacent soft-pack battery cells 10, which has a simple structure and is convenient to arrange, so that the partition 20 can cooperate with the buffer member 30 to provide a good support for the soft-pack battery cell 10, and the buffer member 30 cooperates with the partition 20 to provide a good buffering effect for the two adjacent soft-pack battery cells 10 where the partition 20 is arranged, so that any two adjacent soft-pack battery cells 10 in the battery cell group can obtain a good buffering effect, making the overall structure of the battery cell group more stable.

[0339] In some examples of this application, reference Figure 8 and Fig.12 As shown, in the first direction, at most one of the buffer 30 and the separator 20 may be disposed between any two adjacent soft-pack battery cells 10 .

[0340] In this embodiment, at most one of the buffer 30 and the partition 20 is provided between any two adjacent soft-pack battery cells 10 , that is, a partition 20 may be provided without the buffer 30 , or a buffer 30 may be provided without the partition 20 .

[0341] In the present embodiment, at most one of the buffer member 30 and the partition 20 is provided between any two adjacent soft-pack battery cells 10, so that the partitions 20 and the buffer members 30 arranged in the battery cell group can be arranged at intervals or staggered, thereby reducing the difficulty of assembling when the partitions 20 and the buffer members 30 are arranged between the same two soft-pack battery cells 10 at the same time, so that the battery cell group, the partitions 20 and the buffer members 30 can be assembled conveniently and easily.

[0342] In some examples of this application, reference Figure 8 and Fig.12 As shown, in the first direction, at least one soft-pack battery cell 10 may be sandwiched between the buffer 30 and the separator 20 .

[0343] In this embodiment, at least one soft-pack battery cell 10 is sandwiched between the buffer 30 and the partition 20, that is, one or more soft-pack battery cells 10 can be sandwiched between the buffer 30 and the partition 20, and at least one soft-pack battery cell 10 is supported by the partition 20 and cushioned and vibration-reduced by the buffer 30.

[0344] In the present embodiment, at least one soft-pack battery cell 10 is sandwiched between the buffer 30 and the partition 20, and the structure is simple, so that the partition 20 and the buffer 30 can be flexibly and conveniently arranged in the battery cell group, so that the buffer 30 and the partition 20 can cooperate to provide good support and buffering for multiple soft-pack battery cells 10, so that the battery device 100 can be more convenient to assemble and the battery device 100 can operate stably.

[0345] In one example of this application, reference Figure 8 and Fig.12 As shown, in the first direction, one of the buffer 30 and the separator 20 may be disposed between any two adjacent soft-pack battery cells 10 , and the buffer 30 and the separator 20 in the battery cell group are alternately disposed along the first direction.

[0346] In this embodiment, one of the buffer 30 and the partition 20 may be provided between any two adjacent soft-pack battery cells 10, and the buffer 30 and the partition 20 are alternately arranged along the first direction. For example, in the first direction, an arrangement position is set between two adjacent soft-pack battery cells 10, and a plurality of soft-pack battery cells 10 in the battery cell group constitute a plurality of arrangement positions arranged along the first direction. Then, the plurality of arrangement positions may be arranged in sequence along the first direction with the partition 20 and the buffer 30 arranged alternately. The two adjacent soft-pack battery cells 10 arranged with the partition 20 are bonded and fixed by the partition 20, and the two adjacent soft-pack battery cells 10 arranged with the buffer 30 are abutted and matched by the buffer 30.

[0347] In the present embodiment, a buffer member 30 or a partition 20 is arranged between two adjacent soft-pack battery cells 10 in the battery cell group. The buffer member 30 and the partition 20 are alternately arranged in the first direction, and the structure is simple, so that the arrangement of the partition 20 and the buffer member 30 in the battery cell group is more balanced, so that each soft-pack battery cell 10 in the battery cell group can obtain stable and reliable support and buffering effect, so that the overall structural stability of the battery cell group is better, so that the battery device 100 operates more stably and has better thermal management performance.

[0348] In some examples of the present application, the buffer member 30 may cover more than 80% of the thickness side surface area of ​​the soft-pack battery cell 10 .

[0349] In this embodiment, the buffer 30 covers more than 80% of the surface area of ​​the thickness side of the soft-pack battery cell 10. For example, the buffer 30 can cover 81%, 82%, 84%, 85%, 90%, 100%, etc. of the surface area of ​​the thickness side of the soft-pack battery cell 10.

[0350] In this embodiment, the buffer member 30 is arranged to cover more than 80% of the surface area of ​​the thickness side of the soft-pack battery cell 10, so that the soft-pack battery cell 10 and the buffer member 30 can form a larger buffer matching area, so that the buffer member 30 can cover most of the surface of the soft-pack battery cell 10 on one side in the first direction, so that the buffer member 30 can play a stable and effective buffering role on the soft-pack battery cell 10.

[0351] In some embodiments of the present application, reference Fig.13 and Fig.14 As shown, the two ends of the soft-pack battery cell 10 in the third direction respectively have conductive members 12, which are electrically connected to the electrode assembly and at least partially exposed outside the membrane shell 11, and the conductive members 12 on the same side of two adjacent soft-pack battery cells 10 in the battery cell group are connected.

[0352] In the present embodiment, two adjacent soft-pack battery cells 10 in the battery cell group are connected by the conductive member 12 on the same side. For example, when the positive electrodes of the multiple soft-pack battery cells 10 are arranged on the same side of the third direction, the two adjacent soft-pack battery cells 10 can be connected in parallel by connecting through the conductive member 12 on the same side. When the positive electrodes and negative electrodes of the multiple soft-pack battery cells 10 on the same side are arranged alternately, the two adjacent soft-pack battery cells 10 can be connected in parallel by connecting through the conductive member 12 on the same side. Alternatively, the arrangement of the positive and negative electrodes in the multiple soft-pack batteries on the same side can be more flexibly and complexly arranged as needed, and the multiple soft-pack battery cells 10 can be connected in series and parallel by connecting through the conductive member 12 on the same side.

[0353] In this embodiment, by connecting the conductive members 12 on the same side of two adjacent soft-pack battery cells 10, different electrical connection modes of multiple soft-pack battery cells 10 in the battery cell group can be met, making the electrical connection of multiple soft-pack battery cells 10 more convenient and easy.

[0354] In one embodiment of the present application, reference Fig.13 and Fig.14As shown, the battery cell group may include at least three soft-pack battery cells 10, and the soft-pack battery cell 10 located between two adjacent soft-pack battery cells 10 in the battery cell group is an intermediate battery cell, and of the two conductive members 12 at both ends of the intermediate battery cell, one conductive member 12 is connected to the conductive member 12 on the same side of a soft-pack battery cell 10 adjacent to the intermediate battery cell, and the other conductive member 12 is connected to the conductive member 12 on the same side of another soft-pack battery cell 10 adjacent to the intermediate battery cell.

[0355] In this embodiment, the battery cell group includes at least three soft-pack battery cells 10. For example, when the battery cell group is provided with three soft-pack battery cells 10, in the first direction, the soft-pack battery cell 10 located in the middle is recorded as the middle battery cell, and the other two soft-pack battery cells 10 can be recorded as adjacent battery cells. When the battery cell group is provided with four soft-pack battery cells 10, the soft-pack battery cell 10 located in the middle of the three adjacent soft-pack battery cells 10 is recorded as the middle battery cell, and the two adjacent soft-pack battery cells 10 can be recorded as adjacent battery cells. On the same side in the third direction, the conductive member 12 of the middle battery cell is connected to the conductive member 12 of one of the adjacent battery cells, and the other conductive member 12 of the middle battery cell is connected to the conductive member 12 of another of the adjacent battery cells. Then, the conductive member 12 can form an end-to-end electrical connection form in which the electrodes at both ends of the multiple soft-pack battery cells 10 in the third direction are connected.

[0356] In this embodiment, when the positive and negative electrodes of the soft-pack battery cells 10 are arranged on the same side of both sides of the third direction, two adjacent soft-pack battery cells 10 can form a common electrode through the connection of the conductive member 12. For example, after the positive electrodes of the two soft-pack battery cells 10 arranged on the same side are connected through the conductive member 12, the external circuit of the two conductive members 12 can be connected to the conductive member 12 to be connected to the two soft-pack battery cells 10. When the positive and negative electrodes of the soft-pack battery cells 10 are arranged alternately along the first direction on both sides of the third direction, multiple soft-pack battery cells 10 can form a series electrical connection, and the battery cell group can be electrically connected to the external circuit as a whole through the two conductive members 12.

[0357] In the present embodiment, one conductive member 12 of the middle battery cell is connected to the conductive member 12 on the same side of an adjacent soft-pack battery cell 10, and the other conductive member 12 of the middle battery cell is connected to the conductive member 12 on the same side of another adjacent soft-pack battery cell 10. The structure is simple and the connection relationship is clear and simple, so that a single conductive member 12 is connected to only a single conductive member 12, thereby reducing the probability of problems such as confusion in the connection relationship and the need to increase adapters when a single conductive member 12 is connected to multiple conductive members 12 when multiple soft-pack batteries are connected, so that multiple soft-pack battery cells 10 can be conveniently and easily connected, making the battery cell group more efficient and convenient when assembled.

[0358] In one embodiment of the present application, reference Fig.14 As shown, the two conductive members 12 constituting the connection may be overlapped and connected, and at least one conductive member 12 is in a bent shape.

[0359] In this embodiment, the two conductive members 12 constituting the connection are overlapped, that is, the two conductive members 12 have a certain overlapped matching area, and at least one conductive member 12 is in a curved shape. For example, one conductive member 12 can extend straightly along a third direction, and the other conductive member 12 can be bent toward the conductive member 12 in a first direction to achieve overlap with the conductive member 12, or both conductive members 12 are in a curved shape. For example, the two conductive members 12 can be bent toward each other in the first direction and achieve overlap.

[0360] In this embodiment, the two conductive members 12 constituting the connection are arranged to be overlapped and connected, so that the two conductive members 12 have a larger connection area, so that the connection and fixation of the two conductive members 12 are more stable and reliable. At least one conductive member 12 is in a bent shape, so that the connection of the two conductive members 12 is more convenient and easy.

[0361] In one embodiment of the present application, reference Fig.14 As shown, the two conductive members 12 constituting the connection can be connected via a transition piece 70 , and the transition piece 70 is in a bent shape.

[0362] In this embodiment, the two conductive members 12 are connected by a transition piece 70, which is in a curved shape. The two conductive members 12 that are exemplarily connected can extend straight along a third direction. The transition piece 70 is overlapped and connected to the conductive members 12 at both ends of the first direction through its own curved shape.

[0363] In the present embodiment, the two conductive members 12 constituting the connection are connected via an adapter sheet 70, which can reduce the number of processing steps and processes for the conductive members 12 when the soft-pack battery cells 10 are connected. The standardized adapter sheet 70 can be used for fast and efficient connection processing, thereby making it more convenient and efficient to connect multiple soft-pack battery cells 10, and improving the production efficiency of the battery cell group.

[0364] In one embodiment of the present application, reference Fig.14 As shown, the connection can be in a curved shape, and the curved shape is U-shaped.

[0365] In this embodiment, the connection is in a curved shape, which means that the position where the two conductive parts 12 are connected is formed in a curved shape. The conductive parts 12 can be bent at the ends during processing, and the two connected conductive parts 12 can be connected at the time of connection to form a curved shape at the connection.

[0366] In this embodiment, the connection between the two connected conductive members 12 is formed into a curved shape and the curved shape is U-shaped, which has a simple structure and is easy to process and form. It can also greatly reduce the stress concentration at the connection between the two connecting members, making the connection between the two connecting members more stable and reliable.

[0367] In one embodiment of the present application, the polarities of the two tabs extending from both ends of the soft-pack battery cell 10 are opposite, and the polarities of the two conductive members 12 connected by overlap are the same or opposite.

[0368] In this embodiment, the polarities of the two pole ears extending from both ends of the soft-pack battery cell 10 are opposite, and the polarities of the two overlapping conductive members 12 are the same or opposite. For example, the two overlapping conductive members 12 can be respectively connected to the positive pole ears and the negative pole ears of the two soft-pack battery cells 10, and the two overlapping conductive members 12 can also be respectively connected to the two positive pole ears or the two negative pole ears of the two cells.

[0369] In this embodiment, the polarities of the two pole ears extending from both ends of the soft-pack battery cell 10 are opposite to meet the use requirements of the soft-pack battery cell 10. The polarities of the two overlapping conductive members 12 are the same or opposite, so that multiple soft-pack battery cells 10 can be flexibly connected and assembled as needed.

[0370] In one embodiment of the present application, reference Fig.11 and Fig.12 As shown, the number of battery cell groups may be multiple, and at least two battery cell groups are arranged in the third direction, wherein the conductive members 12 of two adjacent soft-pack battery cells 10 along the third direction are directly connected.

[0371] In this embodiment, multiple battery cell groups are arranged in the third direction, and the conductive members 12 of two adjacent soft-pack battery cells 10 in the third direction are directly connected. For example, if two battery cell groups are arranged in the third direction, the soft-pack battery cells 10 in the two battery cell groups are arranged adjacent to each other in the third direction. Taking two adjacent soft-pack battery cells 10 in the two battery cell groups as an example, the conductive member 12 of one soft-pack battery cell 10 facing the side of the other soft-pack battery cell 10 and the conductive member 12 of the other soft-pack battery cell 10 facing the side of the soft-pack battery cell 10 are located on the same side of any soft-pack battery cell 10 in the third direction, and the two conductive members 12 of the two soft-pack battery cells 10 located on the same side in the third direction can extend straight along the third direction and be directly overlapped and connected.

[0372] In the present embodiment, the conductive members 12 of two adjacent soft-pack battery cells 10 along the third direction are directly connected, which has a simple structure and is convenient and easy to connect, can meet the arrangement requirements of the partition 20, and can well reduce the number of steps and processes for bending the conductive members 12 of two adjacent soft-pack battery cells 10 for connection during production or the number of adapters used for connection, thereby making the production efficiency of the battery cell group higher during production and processing.

[0373] In some embodiments of the present application, the soft-pack battery cell 10 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0374] In this embodiment, the soft-pack battery cell 10 is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell. The lithium iron phosphate battery cell has the advantages of high reliability, long cycle life, good high temperature performance, etc. The ternary battery cell has the advantages of high energy density, fast charging, etc. The solid-state battery cell has the advantages of high reliability, high energy density, long cycle life, etc. For example, the solid-state battery cell can be a sulfide solid-state battery, an oxide solid-state battery or a polymer solid-state battery, a composite solid-state electrolyte battery, a garnet solid-state battery, etc.

[0375] In this embodiment, the soft-pack battery cell 10 is set to any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell 10 can be flexibly set to different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell 10 wider, so that the battery device 100 can better meet different usage requirements.

[0376] In some embodiments of the present application, the soft-pack battery cell 10 is a lithium iron phosphate battery cell, and in the positive electrode material of the soft-pack battery cell 10, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96:1-3:1-3; the soft-pack battery cell 10 is a ternary battery cell, and in the positive electrode material of the soft-pack battery cell 10, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96:2-3:1-2.

[0377] It should be noted that the positive electrode of the soft-pack battery cell 10 may be a positive electrode sheet, which may include a positive electrode collector and a positive electrode film layer disposed on at least one surface of the positive electrode collector, wherein the positive electrode film layer includes a positive electrode active material.

[0378] 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.

[0379] 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.).

[0380] As an example, when the soft-pack battery cell 10 of the embodiment of the present application is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; Optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the soft-pack battery cell 10. However, the present application 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.

[0381] 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.

[0382] The layered transition metal oxide includes at least one of a compound of the general formula LiaNibCocMdOeAf and a modified compound 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.

[0383] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5 At least one of Co0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), LiNi0.9Co0.05Mn0.05O2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi0.80Co0.15Al0.05O2) and modified compounds thereof.

[0384] In the embodiments of the present application, 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.

[0385] The soft-pack battery cell 10 is accompanied by the deintercalation and consumption of active ions such as Li during the charge and discharge process, and the molar content of Li is different when the soft-pack battery cell 10 is discharged to different states. In the examples of the positive electrode active materials in the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. The positive electrode active material is used in the battery system, and the molar content of Li may change after charge and discharge cycles.

[0386] In the examples of the present application regarding the positive electrode active materials, the molar content of oxygen O is only a theoretical value. The release of oxygen from the lattice will cause the molar content of oxygen O to change. In reality, the molar content of oxygen O will fluctuate.

[0387] In the embodiments of the present application, the content of the elements in the positive electrode active material is 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.

[0388] 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.

[0389] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The present application embodiment has no particular restrictions on the type of the 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%.

[0390] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The embodiment of the present application 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%.

[0391] 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.

[0392] 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.

[0393] 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.

[0394] 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.).

[0395] As an example, the negative electrode active material may adopt the negative electrode active material for the soft-pack battery cell 10 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, 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 present application is not limited to these materials, and other traditional materials that can be used as battery negative electrode film layers may also be used. These negative electrode film layers may be used alone or in combination of two or more.

[0396] In some embodiments, the negative electrode active material includes silicon, which may be present in the form of a silicon-based material, such as a silicon-based material that 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 10.

[0397] 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%. In the soft-pack battery cell 10 system, when the mass content of silicon is within the above range, the energy density of the soft-pack battery cell 10 can be improved.

[0398] In the embodiments of the present application, the mass content of silicon in the negative electrode film layer has a meaning well known in the art and can be detected by using equipment and methods well known in the art. For example, the negative electrode plate is immersed in a solvent such as water, the negative electrode active material is separated from the negative electrode current collector, and the negative electrode active material is obtained by filtration. The negative electrode active material is measured using an ICAP7400 inductively coupled plasma-emission spectrometer of ThermoFisher Scientific, USA, and with reference to GB / T30902-2014 standard to obtain the silicon content.

[0399] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The embodiment of the present application has no particular restrictions on the type of the 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%.

[0400] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The embodiment of the present application 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%.

[0401] 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%.

[0402] 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.

[0403] In some embodiments, the separator includes a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0404] The embodiments of the present application have no particular restrictions on the type of isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0405] 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.

[0406] 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.

[0407] The porous base membrane may include one or more of polyethylene and polypropylene.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] In some embodiments, the soft pack battery cell 10 further includes an electrolyte.

[0412] During the charge and discharge process of the battery cell, active ions are embedded and released back and forth between the positive electrode and the negative electrode, and the electrolyte plays a role in conducting active ions between the positive electrode and the negative electrode. The present application embodiment has no particular limitation on the type of electrolyte, which can be selected according to actual needs.

[0413] The electrolyte includes electrolyte salt and solvent. The types of electrolyte salt and solvent are not specifically limited and can be selected according to actual needs.

[0414] 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.

[0415] 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.

[0416] In this embodiment, when the soft-pack battery cell 10 is set as a lithium iron phosphate battery cell, the usage ratio of the positive electrode active material, the binder, and the conductive agent in the positive electrode material of the soft-pack battery cell 10 is 96:1-3:1-3, for example, the usage ratio of the three can be 96:1:1, 96:1.2:2.3, 96:1.5:3, 96:2:1.3, 96:2.2:2, 96:2.6:3, 96:3:1, etc. Preferably, the positive electrode active material is lithium iron phosphate, the binder is polyvinylidene fluoride, the conductive agent is conductive graphite, and the usage ratio of the positive electrode active material, the binder, and the conductive agent can be 96:2:2.

[0417] In this embodiment, when the soft-pack battery cell 10 is set as a ternary battery cell, the positive electrode material of the soft-pack battery cell 10 has a usage ratio of 96:2-3:1-2 among the positive electrode active material, the binder, and the conductive agent. For example, the usage ratio of the three can be 96:2:1.3, 96:2.1:1.5, 96:2.1:1.5, 96:2.5:1.5, 96:2.6:1.8, 96:3:1, 96:3:2, etc. Preferably, the ternary battery cell can be eight-series lithium nickel-chromium manganese oxide LiNi0.8Co0.1Mn0.1O2, in which the usage ratio of the positive electrode active material, the binder, and the conductive agent can be 96:2.5:1.5.

[0418] In this embodiment, the soft-pack battery cell 10 is set as a lithium iron phosphate battery cell, and the usage ratio of the positive active material, the binder, and the conductive agent is 96:1-3:1-3, or the soft-pack battery cell 10 is set as a ternary battery cell, and the usage ratio of the positive active material, the binder, and the conductive agent in the positive electrode material of the soft-pack battery cell 10 is 96:2-3:1-2, so that the soft-pack battery cell 10 can have a higher energy density, better electrode structure stability and reliability, and greatly reduce the probability of active material falling off or stratification during charging and discharging, so that the soft-pack battery cell 10 has a longer cycle life, and the resistance inside the electrode is reduced, so that the soft-pack battery cell 10 can have better charging and discharging efficiency and power density.

[0419] In one embodiment of the present application, the soft-pack battery cell 10 is a ternary battery cell, and the battery device 100 further includes a shell, and a plurality of soft-pack battery cells 10 are accommodated in the shell. In the second direction, the shell is provided with a pressure relief area.

[0420] In the present embodiment, the soft-pack battery cell 10 is configured as a ternary battery cell, and the battery cell group is provided with a shell, which accommodates a plurality of soft-pack battery cells 10, wherein a pressure relief zone is provided on a side of the shell facing the soft-pack battery cell 10 in the second direction. Exemplarily, the soft-pack battery cell 10 may be provided with a pressure relief structure on a side of the shell facing the second direction, and the pressure relief structure may be opposite to the pressure relief zone. When thermal runaway occurs in the soft-pack battery cell 10, high-temperature gas may break through the shell at the pressure relief zone and be released.

[0421] The pressure relief area may be a pressure relief hole, a pressure relief notch or a weak part, etc. The material of the shell may be a metal material or a non-metal material. The metal material may include but is not limited to aluminum alloy, stainless steel or iron, etc., and the non-metal material may be but is not limited to plastic, composite material, etc. Exemplarily, the shell may accommodate part of the multiple soft-pack battery cells 10 in the battery cell group. For example, a single shell may accommodate two, three or four adjacently arranged soft-pack battery cells 10. The battery cell group may accommodate all the soft-pack battery cells 10 by arranging multiple shells along the first direction.

[0422] In this embodiment, the battery cell group is provided with a shell, which can provide mechanical protection on the outside of the multiple soft-pack battery cells 10, reduce the risk of the soft-pack battery cells 10 being damaged by external mechanical impact, and can also better fix the positions of the multiple soft-pack battery cells 10, reduce the probability of the soft-pack battery cells 10 being displaced inside the box 60, and help improve the installation reliability of the soft-pack battery cells 10 in the box 60.

[0423] In this embodiment, the shell is provided with a pressure relief zone in the second direction, so that the soft-pack battery cells 10 in the battery cell group can stably and reliably perform directional pressure relief when thermal runaway occurs, thereby greatly reducing the risk of explosion of the battery cell group and making the battery cell group operate more stably and reliably.

[0424] In one embodiment of the present application, referring to the figure, the shell may include a first shell wall, a second shell wall and a third shell wall, the second shell wall and the third shell wall are connected to both ends of the first shell wall in the first direction, and a first opening is formed between the second shell wall and the third shell wall.

[0425] By configuring the shell to include a first shell wall, a second shell wall, and a third shell wall, the shell as a whole can be a U-shaped shell. This shape design allows the soft-pack battery cell 10 to be relatively easily inserted or removed from the first opening. During the assembly process of the battery device 100, the assembler can slide the soft-pack battery cell 10 into the first opening of the U-shaped shell. Compared with a completely closed shell structure, this method is simpler and faster, and when the soft-pack battery cell 10 needs to be maintained, repaired, or replaced, the soft-pack battery cell 10 can also be more conveniently removed from the shell. For example, on the production line of the battery device 100, this structure of the shell can improve installation efficiency and reduce assembly costs.

[0426] The shell of the above structure can also better fit the shape of the soft-pack battery cell 10. The soft-pack battery cell 10 is usually flat, and the U-shaped shell can tightly surround most of the surface of the soft-pack battery cell 10. The first shell wall and the second shell wall of the shell can replace part of the partition 20 for support as needed, while ensuring good protection for the soft-pack battery cell 10, and effectively utilizing the space inside the box 60, which is very important for improving the energy density of the battery device 100. For example, when designing a more compact battery device 100, the U-shaped shell can arrange the soft-pack battery cells 10 in a more reasonable layout, and more soft-pack battery cells 10 can be loaded into the limited box 60, thereby increasing the total capacity of the battery device 100.

[0427] In the above technical solution, the outer shell is set to the above-mentioned structure to facilitate the assembly of the battery cell group, which is beneficial to improving assembly efficiency and reducing costs. It is also beneficial to later maintenance and reducing the cost of use. It can also better restrain multiple soft-pack battery cells 10 while reducing the space occupied inside the box body 60, which is beneficial to improving the compactness of the spatial layout inside the battery device 100, and thus can improve the energy density of the battery device 100.

[0428] In some embodiments of the present application, reference Figure 6 As shown, the battery device 100 may further include a box body 60, the box body 60 has an installation cavity, and the battery cell assembly is arranged in the installation cavity.

[0429] In this embodiment, the battery device 100 includes a box 60. For example, the box 60 may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box 60 to accommodate the battery cell group. The closed space here means covered or closed, which may be sealed or unsealed. The first box may be a top cover or a bottom plate.

[0430] As an example, the box 60 may include a top cover, a frame, and a bottom plate, and the top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box 60 to accommodate the battery cell group. In some embodiments, the box 60 can be used as part of the chassis structure of the vehicle. For example, part of the box 60 can become at least a part of the floor of the vehicle, or part of the box 60 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0431] Other structures and operations of the battery device 100 of this embodiment are known to those skilled in the art and will not be described in detail here.

[0432] Reference below Figure 1-Figure 16 An energy storage device according to an embodiment of the third aspect of the present application is described.

[0433] like Figure 1-Figure 16 As shown, the energy storage device according to the embodiment of the present application includes: a power conversion device and a battery device 100 according to the embodiment of the second aspect of the present application, and the battery device 100 is used to store or provide electrical energy.

[0434] Other structures and operations of the energy storage device according to the embodiment of the present application are known to ordinary technicians in the field and will not be described in detail here.

[0435] According to the energy storage device of the embodiment of the present application, by setting the battery device 100 of the second embodiment of the above-mentioned second aspect, by setting the thickness of the membrane shell 11 to be less than 0.2 mm, and the first dimension is greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery monomer 10 has a larger thickness and the wall thickness of the membrane shell 11 is smaller, so that the soft-pack battery monomer 10 has a higher energy density, and at the same time, the ratio of the second dimension to the first dimension of any membrane portion 111 is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions 111 of the membrane shell 11 have similar or identical size structures and structural properties, so that the two membrane portions 111 11 can have a relatively balanced bearing capacity for the stress generated in the accommodating cavity, so that the overall structure of the membrane shell 11 is more stable and the structural performance such as mechanical strength is better, so that the membrane shell 11 can well meet the support and protection needs of the soft-pack battery cell 10 when the thickness is large under the condition that the wall thickness is less than or equal to 0.2 mm, thereby stably and reliably improving the energy density of the soft-pack battery cell 10, thereby reducing the number of structural components such as support and heat conduction in the battery device 100, and increasing the arrangement space of the soft-pack battery cell 10 in the battery device 100, so that the overall energy density of the battery device 100 is greatly improved.

[0436] Reference below Figure 1-Figure 16 An electrical device 1000 according to an embodiment of the fourth aspect of the present application is described.

[0437] like Figure 1-Figure 16As shown, the electrical device 1000 according to the embodiment of the present application includes a battery device 100 according to the embodiment of the second aspect of the present application or an energy storage device according to the embodiment of the third aspect of the present application, and the battery device 100 is used to store or provide electrical energy.

[0438] Other structures and operations of the electrical device 1000 according to the embodiment of the present application are known to those skilled in the art and will not be described in detail here.

[0439] According to the electric device 1000 of the embodiment of the present application, by setting the battery device 100 of the second embodiment or the energy storage device of the third embodiment, by setting the thickness of the membrane shell 11 to be less than 0.2 mm, and the first dimension is greater than or equal to 5 mm and less than or equal to 70 mm, the soft-pack battery monomer 10 has a larger thickness and the wall thickness of the membrane shell 11 is smaller, so that the soft-pack battery monomer 10 has a higher energy density, and at the same time, the ratio of the second dimension to the first dimension of any membrane portion 111 is greater than or equal to 0.4 and less than or equal to 0.6, so that the two membrane portions 111 of the membrane shell 11 have similar or identical size structures and structural properties. The two membrane parts 111 can have a more balanced bearing capacity for the stress generated in the accommodating cavity, so that the overall structure of the membrane shell 11 is more stable and the structural performance such as mechanical strength is better, so that the membrane shell 11 can meet the support and protection needs of the soft-pack battery cell 10 when the thickness is large under the condition that the wall thickness is less than or equal to 0.2 mm, so that the energy density of the soft-pack battery cell 10 can be stably and reliably improved, thereby reducing the number of structural components such as support and heat conduction in the battery device 100, and increasing the arrangement space of the soft-pack battery cell 10 in the battery device 100, so that the overall energy density of the battery device 100 is greatly improved.

[0440] The following will refer to Figure 1-Figure 16 An electric device 1000 according to a specific embodiment of the present application is described.

[0441] like Figure 1-Figure 16 As shown, in this embodiment, the electric device 1000 includes a motor 200 , a controller 300 and a battery device 100 , and the controller 300 is used to control the battery device 100 to supply power to the motor 200 .

[0442] The battery device 100 includes a box 60, a battery cell group, a partition 20, a buffer 30, and a heat exchange plate 50. The box 60 has an installation cavity, and the heat exchange plate 50 can be arranged in the installation cavity and located at the bottom of the installation cavity in the second direction. The number of battery cell groups is two, and the two battery cell groups are arranged in the installation cavity and arranged in the third direction. The battery cell group is fixed to the first water-cooled bottom plate by bonding with a thermally conductive adhesive.

[0443] The battery cell group includes a plurality of soft-pack battery cells 10 arranged along a first direction, and the number of soft-pack battery cells 10 in the two battery cell groups is the same and arranged along a third direction. In the first direction, a partition 20 is provided at both ends of the battery cell group, and the partition 20 is arranged within the arrangement range of the two battery cell groups along the third direction. The partition 20 is arranged one for every two soft-pack battery cells 10 in the first direction, and a buffer 30 is arranged between two soft-pack battery cells 10 between two adjacent partitions 20, and the buffer 30 abuts against the two soft-pack battery cells 10, and the partition 20 is bonded and fixed to the adjacent soft-pack battery cells 10.

[0444] The soft-pack battery cell 10 includes a film shell 11, an electrode assembly and a conductive member 12. The film shell 11 includes two film portions 111. The two film portions 111 are folded in half and hot-pressed to form a shell structure. The film portion 111 is formed with a receiving groove. The film portion 111 includes a sealing edge 1111, a side wall 1112 and a bottom wall 1113 which are sequentially connected along a first direction. The sealing edge 1111 of the two film portions 111 are formed as a whole by hot pressing. The sealing edge 1111 on one side of the film shell 11 in the second direction is folded to form a sealing edge boss 1101. The electrode assembly is arranged in the receiving cavity. The positive electrode ear and the negative electrode ear of the electrode assembly are respectively connected to the two conductive members 12. The two conductive members 12 are respectively arranged on both sides of the soft-pack battery cell 10 in the third direction. The conductive member 12 extends out of the film shell 11 from the receiving cavity along the third direction. The extended portion is formed as a lead-out portion, and the lead-out portion is sheet-shaped.

[0445] In another embodiment of the soft-pack battery cell 10 of the present application, the battery device 100 may further include an outer shell, which is a U-shaped shell, including a first shell wall, a second shell wall and a third shell wall. The first shell wall is arranged on the side of the battery cell group away from the heat exchange plate 50 in the second direction, and the second shell wall and the third shell wall are respectively connected to the two ends of the first shell wall in the first direction and are arranged between adjacent soft-pack battery cells 10. The second shell wall and the third shell wall can replace part of the partition 20. The cooperation of multiple shells plays a role in structural reinforcement and support of the battery cell group, making the overall structure of the battery cell group more stable and compact, and facilitating the assembly of the battery cell group, which is conducive to improving assembly efficiency and reducing costs.

[0446] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A soft pack battery cell, characterized in that: include: A membrane shell (11), wherein the wall thickness of the membrane shell (11) is less than or equal to 0.2 mm, and the membrane shell (11) comprises two membrane portions (111) connected in a first direction, the two membrane portions (111) each define a receiving groove, and the receiving grooves of the two membrane portions (111) are arranged facing each other in the first direction and together constitute a receiving cavity of the membrane shell (11); an electrode assembly, wherein the electrode assembly is disposed in the accommodating cavity, The size of the soft-pack battery cell in the first direction is a first size, the size of any one of the membrane portions (111) in the first direction is a second size, the first size is greater than or equal to 5 mm and less than or equal to 70 mm, and the ratio of the second size to the first size is greater than or equal to 0.4 and less than or equal to 0.

6.

2. The soft-pack battery cell according to claim 1, characterized in that: A ratio of the second size to the first size is greater than or equal to 0.45 and less than or equal to 0.

55.

3. The soft-pack battery cell according to claim 2, characterized in that: The ratio of the second size to the first size is 0.

5.

4. The soft-pack battery cell according to claim 1, characterized in that: The first size is greater than or equal to 15 mm and less than or equal to 45 mm.

5. The soft-pack battery cell according to claim 1, characterized in that: The second size is greater than or equal to 3 mm and less than or equal to 35 mm.

6. The soft-pack battery cell according to claim 5, characterized in that: The second size is greater than or equal to 7 mm and less than or equal to 22 mm.

7. The soft-pack battery cell according to any one of claims 1 to 6, characterized in that: The membrane portion (111) comprises: a sealing edge (1111), a side wall (1112) and a bottom wall (1113); the sealing edge (1111) and the bottom wall (1113) are arranged at intervals in the first direction; the side wall (1112) extends in a ring shape along the circumference of the bottom wall (1113); one end of the side wall (1112) in the first direction is connected to the circumference of the bottom wall (1113), and the other end extends along the first direction to be connected to the sealing edge (1111); the sealing edge (1111), the side wall (1112) and the bottom wall (1113) cooperate to enclose a receiving groove which is open on one side in the first direction; at least a portion of the electrode assembly is arranged in the receiving groove.

8. The soft-pack battery cell according to claim 7, characterized in that: The side wall (1112) comprises a first arc segment (11121), a straight segment (11122) and a second arc segment (11123) which are sequentially connected along the first direction; the straight segment (11122) extends in a straight line in the first direction; the straight segment (11122) is connected to the arc of the edge seal (1111) via the first arc segment (11121); and the straight segment (11122) is connected to the arc of the bottom wall (1113) via the second arc segment (11123).

9. The soft-pack battery cell according to claim 8, characterized in that: The dimension of the straight line segment (11122) in the first direction is a third dimension, and a ratio of the third dimension to the second dimension is greater than or equal to 0.6 and less than or equal to 0.

9.

10. The soft-pack battery cell according to claim 9, characterized in that: A ratio of the third size to the second size is greater than or equal to 0.7 and less than or equal to 0.

85.

11. The soft-pack battery cell according to claim 8, characterized in that: The dimension of the straight line segment (11122) in the first direction is a third dimension, and the third dimension is greater than or equal to 5 mm and less than or equal to 30 mm.

12. The soft-pack battery cell according to claim 11, characterized in that: The third dimension is greater than or equal to 7 mm and less than or equal to 18 mm.

13. The soft-pack battery cell according to claim 8, characterized in that: The radius of the first arc segment (11121) is greater than or equal to 1.5 mm, and the radius of the second arc segment (11123) is greater than or equal to 1.5 mm.

14. The soft-pack battery cell according to claim 1, characterized in that: The width dimension of the soft-pack battery cell in the second direction is less than or equal to 200 mm, and / or the length dimension of the soft-pack battery cell in the third direction is less than or equal to 650 mm, and the third direction intersects with the second direction and the first direction in pairs.

15. The soft-pack battery cell according to any one of claims 1 to 6, characterized in that: The membrane shell (11) is formed with an edge sealing boss (1101) on the end surface of at least one end in the second direction, and the edge sealing boss (1101) is configured to be formed by folding the edge sealing (1111) of the two membrane parts (111), and the second direction intersects with the first direction.

16. The soft-pack battery cell according to claim 15, characterized in that: The protrusion height of the edge sealing boss (1101) in the second direction is less than or equal to 0.5 mm.

17. The soft-pack battery cell according to claim 1, characterized in that: The soft-pack battery cell has conductive members (12) at both ends in a third direction, the conductive members (12) are electrically connected to the electrode assembly and at least partially exposed outside the membrane shell (11), and the third direction intersects with the first direction.

18. The soft-pack battery cell according to claim 17, characterized in that: The portion of the conductive member (12) exposed outside the membrane shell (11) is a lead-out portion, and the lead-out portion is formed in a sheet shape.

19. The soft-pack battery cell according to claim 18, characterized in that: The end surfaces of both sides of the lead-out portion in the second direction and the end surface of one end of the lead-out portion in the third direction away from the electrode assembly are respectively chamfered.

20. The soft-pack battery cell according to claim 17, characterized in that: The portion of the conductive member (12) exposed outside the membrane shell (11) is a lead-out portion, and the lead-out portion is a flexible structure.

21. The soft-pack battery cell according to claim 17, characterized in that: The portion of the conductive member (12) exposed outside the membrane shell (11) is a lead-out portion, and the thickness of the lead-out portion is 0.1 mm to 0.5 mm.

22. The soft-pack battery cell according to claim 17, characterized in that: The portion of the conductive member (12) exposed outside the membrane shell (11) is a lead-out portion, and the width of the lead-out portion in the second direction is 20 mm to 60 mm.

23. The soft-pack battery cell according to claim 17, characterized in that: The portion of the conductive member (12) exposed outside the membrane shell (11) is a lead-out portion, and the length of the lead-out portion in the third direction is 10 mm to 50 mm.

24. A battery device, characterized in that: It comprises a battery cell group, wherein the battery cell group comprises a plurality of the soft-pack battery cells stacked and arranged along the first direction, and the soft-pack battery cells are the soft-pack battery cells according to any one of claims 1-23.

25. The battery device according to claim 24, characterized in that Also includes: A heat exchange plate (50) is provided on at least one side of the plurality of soft-pack battery cells in a second direction, and is used for heat exchange with the plurality of soft-pack battery cells, wherein the second direction intersects with the first direction.

26. The battery device according to claim 25, characterized in that The surface of the membrane shell (11) on one side facing the heat exchange plate (50) in the second direction is a plane, and is connected to the heat exchange plate (50) via a heat conductive adhesive or a heat conductive pad.

27. The battery device according to claim 25, characterized in that The membrane shell (11) is formed with an edge sealing boss (1101) on one side in the second direction. The battery device further comprises: an adhesive layer (40), the adhesive layer (40) being adhesively connected between the heat exchange plate (50) and the soft-pack battery cell, wherein in the second direction, the height of the adhesive layer (40) is greater than the protruding height of the edge sealing boss (1101).

28. The battery device according to claim 25, characterized in that The battery device further comprises: an adhesive layer (40), the adhesive layer (40) being adhesively connected between the heat exchange plate (50) and the soft-pack battery cell, and a portion of the adhesive layer (40) being configured to overflow between two adjacent soft-pack battery cells in the first direction so as to adhesively connect the two adjacent soft-pack battery cells.

29. The battery device according to claim 24, characterized in that The battery device also includes a bottom plate and an adhesive layer, wherein the bottom plate is located on one side of the battery cell group in the second direction, the battery cell group and the bottom plate are adhesively connected via the adhesive layer, a surface of the soft-pack battery cell facing the adhesive layer is a first surface, and both side surfaces of the soft-pack battery cell in the first direction are second surfaces, and the first surface is connected to two second surfaces by chamfers, wherein the battery device also includes a blocking member, which is disposed at the chamfer, and is configured to prevent the adhesive layer located at the chamfer from overflowing to the position where the second surface is located.

30. The battery device according to claim 29, characterized in that In the first direction, one blocking member is disposed between two adjacent soft-pack battery cells.

31. The battery device according to claim 29, characterized in that The blocking member is a foam member, and the blocking member is bonded to the bottom plate.

32. The battery device according to claim 29, characterized in that The blocking member is an adhesive member, and the adhesive member is adhesively connected to one end of the soft-pack battery cell facing the bottom plate.

33. The battery device according to claim 24, characterized in that A plurality of the soft-pack battery cells are stacked along the first direction, The battery device further comprises a separator (20), the hardness of the separator (20) being higher than that of the membrane shell (11), the number of the separators (20) being multiple, the multiple separators (20) being arranged at intervals in the first direction, and at least two of the soft-pack battery cells being arranged between two adjacent separators (20).

34. The battery device according to claim 33, characterized in that The number of the soft-pack battery cells sequentially arranged between two adjacent separators (20) along the first direction is less than or equal to four.

35. The battery device according to claim 33, characterized in that The soft-pack battery cell extends along a third direction, the third direction being the length direction of the soft-pack battery cell, the length direction of the partition (20) extends along the length direction of the soft-pack battery cell, and the length of the partition (20) is greater than 80% of the length of the soft-pack battery cell.

36. The battery device according to claim 33, characterized in that There are multiple battery cell groups, and at least two of the battery cell groups are arranged in a third direction. The length of the separator (20) is greater than twice the length of the soft-pack battery cell, so that two adjacent battery cell groups arranged along the length direction of the soft-pack battery cell share one separator (20).

37. The battery device according to claim 33, characterized in that The thickness of the separator (20) along the first direction is less than the thickness of the soft-pack battery cell, and the width of the separator (20) along the second direction is greater than 80% of the width of the soft-pack battery cell.

38. The battery device according to claim 33, characterized in that The thickness of the partition (20) along the first direction is 0.8 mm to 2.0 mm.

39. The battery device according to claim 33, characterized in that The partition plate (20) is an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate.

40. The battery device according to claim 33, characterized in that The partition plate (20) is a solid structure.

41. The battery device according to claim 33, characterized in that The partition plate (20) is a heat-conducting component and is heat-conductingly connected to the membrane shell (11).

42. The battery device according to claim 33, characterized in that A heat exchange channel is formed in the partition (20).

43. The battery device according to claim 33, characterized in that The separator (20) is bonded and connected to the adjacent soft-pack battery cells.

44. The battery device according to claim 33, characterized in that The partition (20) is bonded and fixed to the adjacent soft-pack battery cells by double-sided adhesive.

45. The battery device according to claim 33, characterized in that In the first direction, a buffer (30) is provided between at least two adjacent soft-pack battery cells, and the hardness of the buffer (30) is smaller than the hardness of the membrane shell (11).

46. ​​The battery device according to claim 45, characterized in that In the first direction, the buffer (30) and the partition (20) are disposed simultaneously between at least two adjacent soft-pack battery cells.

47. The battery device according to claim 45, characterized in that In the first direction, at most one of the buffer (30) and the separator (20) is provided between any two adjacent soft-pack battery cells.

48. The battery device according to claim 45, characterized in that In the first direction, at least one of the soft-pack battery cells is sandwiched between the buffer (30) and the separator (20).

49. The battery device according to claim 48, characterized in that In the first direction, one of the buffer member (30) and the partition plate (20) is provided between any two adjacent soft-pack battery cells, and the buffer member (30) and the partition plate (20) in the battery cell group are alternately arranged along the first direction.

50. The battery device according to claim 45, characterized in that The buffer (30) covers more than 80% of the surface area of ​​the thickness side of the soft-pack battery cell.

51. The battery device according to claim 24, characterized in that The two ends of the soft-pack battery monomer in the third direction respectively have conductive members (12), the conductive members (12) are electrically connected to the electrode assembly and at least partially exposed outside the membrane shell (11), and the conductive members (12) on the same side of two adjacent soft-pack battery monomers in the battery cell group are connected.

52. The battery device according to claim 51, characterized in that The battery cell group comprises at least three soft-pack battery cells, and the soft-pack battery cell located between two adjacent soft-pack battery cells in the battery cell group is an intermediate battery cell, and of the two conductive members (12) at both ends of the intermediate battery cell, one conductive member (12) is connected to the conductive member (12) on the same side of a soft-pack battery cell adjacent to the intermediate battery cell, and the other conductive member (12) is connected to the conductive member (12) on the same side of another soft-pack battery cell adjacent to the intermediate battery cell.

53. The battery device according to claim 51, characterized in that The two conductive members (12) constituting the connection are overlapped and connected, and at least one conductive member (12) is in a bent shape.

54. The battery device according to claim 51, characterized in that The two conductive members (12) that form a connection are connected via an adapter plate (70), and the adapter plate (70) is in a bent shape.

55. The battery device according to claim 51, characterized in that The connection is in a curved shape, and the curved shape is U-shaped.

56. The battery device according to claim 51, characterized in that The polarities of the two pole ears extending from the two ends of the soft-pack battery cell are opposite, and the polarities of the two conductive members (12) connected in overlap are the same or opposite.

57. The battery device according to claim 51, characterized in that There are multiple battery cell groups, and at least two of the battery cell groups are arranged in a third direction. Wherein, the conductive members (12) of two adjacent soft-pack battery cells along the third direction are directly connected.

58. The battery device according to claim 24, characterized in that The soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

59. The battery device according to claim 58, characterized in that The soft-pack battery cell is a ternary battery cell. The battery device further comprises a shell. A plurality of the soft-pack battery cells are accommodated in the shell. In the second direction, the shell is provided with a pressure relief area.

60. An energy storage device, characterized in that: include: A power conversion device and a battery device according to any one of claims 24-59, wherein the battery device is used to store or provide electrical energy.

61. An electrical device, characterized in that: The invention comprises a battery device according to any one of claims 24 to 59 or an energy storage device according to claim 60, wherein the battery device is used for storing or providing electrical energy.

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