Pouch battery cell, battery apparatus, energy storage apparatus and electrical apparatus

Abstract

A pouch battery cell (10) and a battery apparatus (100), an energy storage apparatus, and an electrical apparatus (1000). The pouch battery cell (10) comprises: a film housing (11), the wall thickness of the film housing (11) being less than or equal to 0.2 mm, the film housing (11) comprising two film portions (111) connected in a first direction, the two film portions (111) both defining accommodating recesses, and the accommodating recesses in the two film portions (111) being arranged facing each other in the first direction so as to together form an accommodating cavity of the film housing (11); and an electrode assembly, the electrode assembly being arranged inside the accommodating cavity. The dimension of the pouch battery cell (10) in the first direction is a first dimension, and the dimension of any film portion (111) in the first direction is a second dimension, the first dimension being greater than or equal to 5 mm and less than or equal to 70 mm, and the ratio of the second dimension to the first dimension being greater than or equal to 0.4 and less than or equal to 0.6.

Description

Soft-pack battery cells and battery devices, energy storage devices and electrical devices Technical Field

[0001] This application relates to the field of battery technology, and in particular to a soft-pack battery cell and battery device, energy storage device and power consumption device. Background Technology

[0002] With the development of science and technology, electrical devices such as vehicles have increasingly higher requirements for battery capacity. When using pouch batteries, the energy density of a single pouch battery cell is relatively low, resulting in a lower energy density for the entire battery device.

[0003] Application content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a pouch cell that can significantly improve energy density, thereby greatly enhancing the overall energy density of the battery device and enabling the battery device to better meet usage requirements.

[0005] This application also proposes a battery device having the aforementioned pouch cell.

[0006] This application also proposes an energy storage device having the above-mentioned battery device.

[0007] This application also proposes an electrical device having the aforementioned battery device or energy storage device.

[0008] According to a first aspect of this application, a pouch cell includes: a membrane housing with a wall thickness of less than or equal to 0.2 mm, the membrane housing comprising two membrane portions connected in a first direction, each membrane portion defining a receiving groove, the receiving grooves of the two membrane portions being arranged facing each other in the first direction and jointly forming a receiving cavity of the membrane housing; and an electrode assembly disposed within the receiving cavity, wherein the dimension of the pouch cell in the first direction is a first dimension, the dimension of any membrane portion in the first direction is a second dimension, the first dimension is greater than or equal to 5 mm and less than or equal to 70 mm, and the ratio of the second dimension to the first dimension is greater than or equal to 0.4 and less than or equal to 0.6.

[0009] According to the pouch cell of this application, by setting the thickness of the membrane shell to 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 pouch cell has a relatively large thickness while the wall thickness of the membrane shell is relatively small, thereby giving the pouch cell a high 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 dimensional structures and structural performance. This allows the two membrane portions to have a more balanced ability to withstand stresses generated within the cavity, making the overall structure of the membrane shell more stable and improving its mechanical strength and other structural performance. Thus, the membrane shell can well meet the support and protection needs of the pouch cell with a thickness of less than or equal to 0.2 mm, thereby reliably improving the energy density of the pouch cell. This reduces the number of supporting and heat-conducting structural components in the battery device, increases the arrangement space of the pouch cell in the battery device, and thus greatly improves the overall energy density of the battery device.

[0010] In some embodiments of this application, the ratio of the second dimension to the first dimension is greater than or equal to 0.45 and less than or equal to 0.55.

[0011] 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 in the first direction are more consistent, which facilitates processing and manufacturing. Furthermore, the receiving grooves of the two membrane portions can have sufficient depth for the arrangement of electrode components, and the two membrane portions maintain relatively consistent mechanical strength, making the overall structure of the membrane shell more stable and reliable. This allows the soft-pack battery cell to operate and be used stably and reliably.

[0012] In one embodiment of this application, the ratio of the second dimension to the first dimension is 0.5.

[0013] In this embodiment, the ratio of the second dimension to the first dimension is set to 0.5, so that the two membrane parts can have the same structure, which makes the processing and molding of the membrane shell more convenient, and allows the two membrane parts to have consistent mechanical strength and structural performance, thereby improving the overall structural stability and reliability of the membrane shell and making the operation of the soft-pack battery cell more stable.

[0014] In some embodiments of this application, the first dimension is greater than or equal to 15 mm and less than or equal to 45 mm.

[0015] In this embodiment, the first dimension is set to be greater than or equal to 15mm and less than or equal to 45mm, so that the soft-pack battery cell has a larger thickness, which can greatly improve the energy density of the battery device and reduce the probability of the soft-pack battery cell structure stability decreasing due to excessive thickness, so that the soft-pack battery cell has a suitable thickness for stable and reliable operation.

[0016] In some embodiments of this application, the second dimension is greater than or equal to 3 mm and less than or equal to 35 mm.

[0017] In this embodiment, the second dimension is set to be greater than or equal to 3mm and less than or equal to 35mm, so that the two membrane parts can be matched to form a membrane shell of the required thickness for the soft-pack battery, thus meeting the setting requirements of the soft-pack battery cell.

[0018] In one embodiment of this application, the second dimension is greater than or equal to 7 mm and less than or equal to 22 mm.

[0019] 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 part has a more suitable size in the first direction, thereby enabling the membrane part to have good mechanical strength and structural stability, thus making the overall structure of the membrane shell more stable and reliable, and enabling the electrode assembly to be stably and reliably arranged in the receiving cavity, thereby making the operation of the soft-pack battery cell more stable.

[0020] In some embodiments of this application, the membrane portion includes: a sealing edge, a sidewall, and a bottom wall. The sealing edge and the bottom wall are spaced apart in the first direction. The sidewall extends circumferentially along the bottom wall in an annular shape. One end of the sidewall in the first direction is connected to the periphery of the bottom wall, and the other end extends along the first direction to connect with the sealing edge. The sealing edge, the sidewall, and the bottom wall cooperate to enclose a receiving groove that is open on one side in the first direction. At least a portion of the electrode assembly is disposed in the receiving groove.

[0021] In this embodiment, the membrane portion includes a sealing edge, sidewalls, and a bottom wall. The structure is simple and can well meet the forming requirements of the receiving groove and receiving cavity, thereby enabling the membrane shell to be processed smoothly and meeting the processing and manufacturing requirements of the soft-pack battery cell.

[0022] In one embodiment of this application, the sidewall includes a first arc segment, a straight segment, and a second arc segment connected sequentially along the first direction. The straight segment extends along a straight line in the first direction. The straight segment is connected to the edge sealing arc through the first arc segment, and the straight segment is connected to the bottom wall arc through the second arc segment.

[0023] In this embodiment, the sidewall is provided with a straight segment extending along the first direction, which can play a good guiding role in the movement and assembly of the electrode assembly, and facilitate the arrangement of the electrode assembly in the receiving groove, so that the space of the receiving groove can be fully utilized. The first arc segment and the second arc segment can work together with the first straight segment to play a good guiding role, reducing the probability of rubbing damage when the electrode assembly is installed in the receiving groove, and enabling the assembled soft-pack battery cell to operate stably.

[0024] In some examples of this application, the dimension of the straight line segment in the first direction is a third dimension, and the 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.

[0025] In this embodiment, by setting the ratio of the third dimension to the second dimension of the straight segment in the first direction to be greater than or equal to 0.6 and less than or equal to 0.9, the receiving groove is formed by the side wall of the straight segment in the first direction, which occupies a large proportion of the receiving groove space. This allows the space in the receiving groove to be more fully utilized when arranging the electrode assembly, and the arrangement of the electrode assembly and the membrane shell can be more compact. This can further improve the energy density of the soft-pack battery cell to a certain extent.

[0026] In one example of this application, the ratio of the third dimension to the second dimension is greater than or equal to 0.7 and less than or equal to 0.85.

[0027] 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 receiving groove has a larger receiving space enclosed by a straight segment in the first direction, so that the space of the receiving 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 segment and the sealing edge and the bottom wall, making the assembly of the electrode assembly and the membrane shell smoother and more convenient.

[0028] In some examples of this application, the dimension of the straight line segment in the first direction is a third dimension, which is greater than or equal to 5 mm and less than or equal to 30 mm.

[0029] In this embodiment, the third dimension of the straight segment along the first direction is set to be greater than or equal to 5mm and less than or equal to 30mm, which can meet the setting requirements of different thicknesses of the soft-pack battery cell, so that the size of the membrane shell formed by the two membrane parts in the first direction can meet the thickness requirements of the battery cell.

[0030] In one example of this application, the third dimension is greater than or equal to 7 mm and less than or equal to 18 mm.

[0031] In this embodiment, the third dimension is further limited to 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.

[0032] In some examples of this 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.

[0033] 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 sufficiently large transition arc segment can be formed between the straight segment and the edge banding, as well as between the straight segment and the bottom wall, thereby making the connection between the straight segment and the bottom wall and the edge banding more stable and reliable, and allowing the first arc segment and the second arc segment to play a better guiding role.

[0034] In some embodiments of this application, the width of the pouch cell in the second direction is less than or equal to 200 mm, and / or the length of the pouch cell in the third direction is less than or equal to 650 mm, wherein the third direction intersects the second direction and the first direction in pairs.

[0035] In this embodiment, by setting the width of the pouch battery cell in the second direction to less than or equal to 200 mm and the length of the pouch battery cell in the third direction to less than or equal to 650 mm, the pouch battery cell can have a small arrangement space in the second direction while meeting the energy density requirements of the battery device, and the overall structure remains stable. This makes the battery device easier to arrange and more stable to operate.

[0036] In some embodiments of this application, the end face of at least one end of the membrane shell in the second direction is formed with a sealing boss, the sealing boss being configured to be formed by folding the sealing edges of the two membrane portions, the second direction intersecting the first direction.

[0037] In this embodiment, a sealing boss is formed on the end face of at least one end of the membrane shell in the second direction. This can effectively reduce the space occupied by the sealing boss in the second direction and the interference to the arrangement of the soft-pack battery cells. This makes the overall size of the soft-pack battery cells smaller in the second direction, which is convenient for the arrangement of the soft-pack battery cells in the battery device. In addition, the sealing boss can improve the sealing reliability of the cavity to a certain extent, so that the soft-pack battery cells have a more stable sealing effect.

[0038] In one embodiment of this application, the protrusion height of the edge sealing boss in the second direction is less than or equal to 0.5 mm.

[0039] In this embodiment, the protrusion height of the edge sealing boss in the second direction is set to be less than or equal to 0.5mm, so that the protrusion size of the edge sealing boss on the soft-pack battery cell is very small. This allows the end of the soft-pack battery cell with the edge sealing boss in the second direction to still be easily assembled with support, fixing and other structures, making it more convenient and easier to assemble the soft-pack battery cell in the battery device.

[0040] In some embodiments of this application, the pouch cell has conductive elements at both ends in a third direction, the conductive elements being electrically connected to the electrode assembly and at least partially exposed outside the membrane shell, the third direction intersecting the first direction.

[0041] In this embodiment, conductive elements are respectively provided at both ends of the pouch battery cell in the third direction. The conductive elements are electrically connected to the electrode assembly. The structure is simple and can well meet the usage requirements of the pouch battery cell.

[0042] In one embodiment of this application, the portion of the conductive element exposed outside the membrane shell is a lead-out portion, which is formed in the form of a sheet.

[0043] In this embodiment, the lead-out portion is set as a sheet, so that the lead-out portion can have a large electrical connection surface, and the lead-out portion can be conveniently and reliably electrically connected to other electrical connectors or conductive components.

[0044] In some examples of this application, the two end faces of the lead-out portion in the second direction are respectively rounded with the end face of the lead-out portion in the third direction opposite to the electrode assembly.

[0045] In this embodiment, the two end faces of the lead-out portion in the second direction and the end face of the lead-out portion in the third direction away from the electrode assembly are respectively rounded. This can effectively disperse the stress on the lead-out portion and reduce the risk of scratches on the soft-pack battery cells and operators caused by sharp edges of the lead-out portion. This allows the lead-out portion to be connected to the battery more conveniently and stably.

[0046] In one embodiment of this application, the portion of the conductive element exposed outside the membrane shell is a lead-out portion, which is a flexible structure.

[0047] In this embodiment, the lead-out section is designed as a flexible structure, which makes it more convenient to make electrical connections to the lead-out section and allows the lead-out section to better adapt to the electrical connection needs of different angles and directions. This makes it more convenient and reliable for the soft-pack battery cell to make electrical connections with other soft-pack battery cells or external circuits.

[0048] In one embodiment of this application, the portion of the conductive element 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.

[0049] In this embodiment, the thickness of the lead-out portion is set to 0.1mm to 0.5mm, so that the lead-out portion has sufficient flow area to meet the electrical connection requirements, and the lead-out portion has sufficient mechanical strength to make stable and reliable electrical connections. It also reduces the probability of problems such as inconvenient connection and increased cost caused by excessively thick lead-out portions, so that the lead-out portion can make stable and convenient electrical connections.

[0050] In one embodiment of this application, the portion of the conductive element exposed outside the membrane shell is a lead-out portion, and the width of the lead-out portion in the second direction is 20mm to 60mm.

[0051] In this embodiment, the width of the lead-out portion in the second direction is set to 20mm-60mm, so that the lead-out portion has sufficient size in the second direction for convenient electrical connection operations, and reduces the probability that the lead-out portion is too wide and difficult to bend, causing inconvenience in electrical connection operations, thereby enabling the lead-out portion to perform electrical connection operations flexibly and conveniently.

[0052] In one embodiment of this application, the portion of the conductive element exposed outside the membrane shell is a lead-out portion, and the length of the lead-out portion in the third direction is 10mm to 50mm.

[0053] In this embodiment, the length of the lead in the third direction is set to be greater than or equal to 10mm, so that the lead has sufficient length for electrical connection. The length of the lead in the third direction is set to be less than or equal to 50mm, which can reduce the cost increase and space occupation caused by excessive lead length, and make the overall structure of the soft-pack battery cell more compact.

[0054] A battery device according to a second aspect of this application includes a cell assembly, the cell assembly comprising a plurality of pouch cell units stacked along a first direction, the pouch cell units being the pouch cell units according to a first aspect of this application.

[0055] According to the battery device of this application, by setting the soft-pack battery cell of the first aspect above, and 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 large thickness and the wall thickness of the membrane shell is small, thereby giving the soft-pack battery cell a high 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 structure and structural performance, so that the two membrane portions can have a more balanced bearing capacity for stress generated in the cavity, making the overall structure of the membrane shell more stable and the mechanical strength and other structural performance better. Thus, the membrane shell can well meet the support and protection needs when the thickness of the soft-pack battery cell 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, thereby reducing the number of supporting, heat-conducting and other structural components in the battery device, increasing the arrangement space of the soft-pack battery cells in the battery device, and thus greatly improving the overall energy density of the battery device.

[0056] In some embodiments of this application, the battery device further includes a heat exchange plate disposed on at least one side of the plurality of pouch cell batteries in a second direction for heat exchange with the plurality of pouch cell batteries, wherein the second direction intersects the first direction.

[0057] In this embodiment, a heat exchange plate is set up and arranged on at least one side of multiple pouch battery cells in the second direction. The structure is simple and the arrangement is reasonable, so that the heat exchange plate can easily exchange heat with multiple pouch battery cells, thereby enabling the cell assembly to obtain a good heat exchange effect, enabling the cell assembly to operate stably and reliably, and thus making the battery device operate more stably.

[0058] In one embodiment of this application, the membrane shell has a flat surface on the side facing the heat exchange plate in the second direction, and is connected to the heat exchange plate by thermally conductive adhesive or thermally conductive pad.

[0059] In this embodiment, the surface of the membrane housing facing the heat exchange plate is set as a plane, which is simple in structure and can make the membrane housing and the heat exchange plate have a stable mating contact surface. The membrane housing can be stably and reliably fixed to the heat exchange plate by thermally conductive adhesive or thermally conductive pad, which makes the assembly and fixing of the soft-pack battery cells on the heat exchange plate more convenient and stable, and makes the assembly and fixing of the cell assembly and the heat exchange plate more reliable.

[0060] In one embodiment of this application, the membrane shell has a sealing boss formed on one side in the second direction, and the battery device further includes an adhesive layer, which is bonded 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 protrusion height of the sealing boss.

[0061] In this embodiment, the side of the membrane housing with the sealing boss is bonded to the heat exchange plate through an adhesive layer. The height of the adhesive layer is greater than the protrusion height of the sealing boss, so that the adhesive layer can fully cover the gap between the end face of the membrane housing and the heat exchange plate. This allows the membrane housing to be reliably and stably bonded and fixed to the heat exchange plate through the adhesive layer, thereby enabling the battery cell assembly to be stably and reliably assembled and fixed to the heat exchange plate.

[0062] In one embodiment of this application, the battery device further includes: an adhesive layer that is bonded between the heat exchange plate and the pouch cell, a portion of the adhesive layer being configured to overflow between two adjacent pouch cells in the first direction to bond the two adjacent pouch cells.

[0063] In this embodiment, a portion of the adhesive layer is configured to overflow between two adjacent pouch cell units in the first direction, so that the two adjacent pouch cell units can be better connected and fixed at the end facing the heat exchange plate. This makes the overall arrangement of multiple pouch cell units in the cell assembly more stable and significantly increases the bonding area between the pouch cell unit and the heat exchange plate through the adhesive layer, making the bonding and fixing of the pouch cell unit and the heat exchange plate more stable. This makes the cell assembly and the heat exchange plate more securely and stably fixed.

[0064] In some embodiments of this application, the battery device further includes a base plate and an adhesive layer. The base plate is located on one side of the cell assembly in a second direction. The cell assembly is bonded to the base plate through the adhesive layer. The surface of the pouch cell facing the adhesive layer is a first surface, and the two surfaces of the pouch cell in the first direction are both second surfaces. The first surface and the two second surfaces are connected by a chamfer. The battery device further includes a blocking member located at the chamfer. The blocking member is configured to prevent the adhesive layer located at the chamfer from overflowing to the location of the second surface.

[0065] In this embodiment, a blocking element is provided at the chamfer to block the overflow of the adhesive layer towards the second surface. This can effectively reduce the probability of the adhesive in the adhesive layer overflowing between the second surfaces of adjacent pouch cell units when the cell assembly and the base plate are bonded together through the adhesive layer. This effectively reduces the risk of stress concentration caused by the overflowing adhesive damaging the pouch cell units, allowing the pouch cell units to maintain a stable structural state and service life.

[0066] In one embodiment of this application, a blocking member is provided between two adjacent pouch cell units in the first direction.

[0067] In this embodiment, a blocking element is set between two adjacent pouch battery cells, which makes the arrangement of the blocking element more convenient and reduces the number of blocking elements used, thereby reducing the cost of the battery device to a certain extent.

[0068] In one embodiment of this application, the blocking member is a foam component, and the blocking member is bonded to the base plate.

[0069] In this embodiment, the blocking component is set as a foam component and bonded to the base plate. The structure is simple, allowing the blocking component to be easily arranged at the chamfer and to stably separate the overflowing adhesive of the adhesive layer. Assembly is convenient.

[0070] In one embodiment of this application, the blocking member is an adhesive member, which is bonded to one end of the soft-pack battery cell facing the base plate.

[0071] In this embodiment, the blocking component is set as an adhesive component, which has a simple structure and can well meet the usage requirements, making it more convenient to assemble and fix the blocking component with the soft-pack battery cell.

[0072] In some embodiments of this application, a plurality of the pouch battery cells are stacked along the first direction, and the battery device further includes a separator, the hardness of which is higher than that of the membrane shell. There are multiple separators, which are spaced apart in the first direction, and at least two pouch battery cells are arranged between two adjacent separators.

[0073] In this embodiment, multiple separators are arranged at intervals along a first direction. The hardness of the separators is greater than that of the membrane shell. At least two soft-pack battery cells are arranged between two adjacent separators. This allows the multiple soft-pack battery cells in the cell assembly to receive stable and reliable support from the separators in the first direction, thereby making the overall structure of the cell assembly more stable. It also allows for a smaller number of separators, enabling the battery device to maintain a high energy density.

[0074] In one embodiment of this application, the number of the pouch battery cells arranged sequentially between two adjacent separators along the first direction is less than or equal to four.

[0075] In this embodiment, the number of pouch cell units between two adjacent separators is set to be less than or equal to four. This makes the arrangement of pouch cell units between two adjacent separators more appropriate, so that each pouch cell unit between the two separators can receive stable and effective support from the two separators. This reduces the probability that the number of pouch cell units between the two separators is too large and exceeds the support capacity of the separators. As a result, multiple separators can provide stable and reliable support for each pouch cell unit in the cell pack, making the overall structure stability of the cell pack better.

[0076] In one embodiment of this application, the pouch battery cell extends along a third direction, which is the length direction of the pouch battery cell, and the separator extends along the length direction of the pouch battery cell, and the length of the separator is greater than 80% of the length of the pouch battery cell.

[0077] In this embodiment, the length of the separator is set to be greater than 80% of the length of the pouch battery cell, so that the pouch battery cell and the separator can have a larger mating support surface, and the separator can cover most or all of the extension range of the pouch battery cell in the third direction, so that the separator can provide good support and separation for the pouch battery cell.

[0078] In one embodiment of this application, there are multiple cell groups, with at least two cell groups arranged in a third direction. The length of the separator is greater than twice the length of the pouch cell, so that two adjacent cell groups arranged along the length direction of the pouch cell can share one separator.

[0079] In this embodiment, multiple cell packs are arranged in a third direction, resulting in a simple structure and reasonable layout that effectively meets the needs of the battery device. The length of the separator is set to be more than twice the length of a single pouch cell, allowing the separator to support at least two adjacent pouch cells simultaneously. This reduces the number of separators required and makes it easier to position and arrange multiple cell packs consistently, thereby significantly improving the assembly efficiency of the battery device.

[0080] In one embodiment of this application, the thickness of the separator along the first direction is less than the thickness of the pouch battery cell, and the width of the separator along the second direction is greater than 80% of the width of the pouch battery cell.

[0081] In this embodiment, the width of the separator is set to be greater than 80% of the width of the pouch battery cell, so that the pouch battery cell and the separator can form a large supporting and mating area, and the separator can cover most of the surface of the pouch battery cell on one side in the first direction, so that the separator can provide good support and separation for the pouch battery cell.

[0082] In one embodiment of this application, the thickness of the partition along the first direction is 0.8 mm to 2.0 mm.

[0083] In this embodiment, the thickness of the separator is set to be greater than or equal to 0.8 mm, so that the separator can have good structural strength to stably and reliably support the soft-pack battery cells. The thickness of the separator is set to be less than or equal to 2 mm, so that the separator has a thinner thickness while meeting the support requirements, thereby reducing the space occupied by the separator in the battery device and enabling the battery device to have a higher energy density.

[0084] In one embodiment of this application, the partition is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0085] In this embodiment, the separator is made of aluminum plate, aluminum alloy plate, copper plate or steel plate, so that the separator can have good mechanical strength, thus meeting the support requirements well, and also has good thermal conductivity, so that the soft-pack battery cells in the cell pack can exchange heat through the separator, and the cell pack can obtain better heat exchange effect.

[0086] In one embodiment of this application, the partition is a solid structure.

[0087] In this embodiment, the separator is set as a solid structure, so that the separator can have good mechanical strength and support reliability, thereby providing more stable and reliable support for multiple soft-pack battery cells in the cell pack.

[0088] In one embodiment of this application, the partition is a thermally conductive element and is thermally connected to the membrane shell.

[0089] In this embodiment, the separator is configured as a heat conductor and is thermally connected to the membrane shell, so that the separator can play a good role in heat exchange for the soft-pack battery cells. This allows the soft-pack battery cells to exchange heat through the separator in the first direction, thereby enabling the cell assembly to obtain a better heat exchange effect and the battery device to have better thermal management performance.

[0090] In one embodiment of this application, a heat exchange channel is formed within the partition.

[0091] In this embodiment, a heat exchange channel is formed within the separator, allowing the separator to function as a liquid cooling plate for efficient heat exchange between the pouch cell and the battery cell. This significantly improves the heat exchange effect of the separator on the pouch cell in the first direction, resulting in better heat exchange performance for the cell assembly and improved thermal management of the battery device. Furthermore, the separator integrates liquid cooling heat exchange functionality, reducing the need for additional heat exchange structures. While improving heat exchange performance, this reduces the number of structural components for non-pouch cell cells within the battery device, allowing for a more compact arrangement of the cell assembly and maintaining a higher energy density.

[0092] In one embodiment of this application, the separator is bonded to the adjacent pouch cell.

[0093] In this embodiment, the separator is bonded to the adjacent soft-pack battery cell, which is simple in structure and easy to fix, so that the separator and the soft-pack battery cell can be arranged compactly, thereby making the overall structure of the cell assembly more compact and stable.

[0094] In one embodiment of this application, the separator is fixed to the adjacent pouch cell by double-sided adhesive.

[0095] In this embodiment, the separator is fixed to the adjacent soft-pack battery cell by double-sided adhesive, which is simple in structure and easy and reliable to fix.

[0096] In one embodiment of this application, in the first direction, a buffer is provided between at least two adjacent pouch cell units, and the hardness of the buffer is less than that of the membrane shell.

[0097] In this embodiment, a buffer is set between two adjacent pouch cells, and the hardness of the buffer is less than that of the membrane shell. This allows the buffer to effectively absorb the deformation of the pouch cell and the vibration under external impact. It also effectively buffers the direct contact friction between the supports of adjacent pouch cells, resulting in better overall structural stability of the cell assembly and enabling the battery device to operate more stably and reliably.

[0098] In some examples of this application, in the first direction, at least two adjacent pouch cell units are simultaneously provided with the buffer and the separator.

[0099] In this embodiment, at least two adjacent pouch cell units are simultaneously provided with a buffer and a separator. The structure is simple and easy to arrange. The separator can work with the buffer to provide good support for the pouch cell units. The buffer and the separator work together to provide good buffering for two adjacent pouch cell units with the separator. This allows any two adjacent pouch cell units in the cell assembly to have good buffering, making the overall structure of the cell assembly more stable.

[0100] In some examples of this application, in the first direction, at most one of the buffer and the separator is provided between any two adjacent pouch cell units.

[0101] In this embodiment, at most one of a buffer or a separator is provided between any two adjacent pouch cell units, so that the separators and buffers arranged in the cell assembly can be arranged alternately or staggered, thereby reducing the assembly difficulty when the separators and buffers are arranged between the same two pouch cell units at the same time, and making it convenient and easy to assemble the cell assembly with the separators and buffers.

[0102] In some examples of this application, in the first direction, at least one of the pouch cell cells is sandwiched between the buffer and the separator.

[0103] In this embodiment, at least one soft-pack battery cell is sandwiched between the buffer and the separator. The structure is simple, and the arrangement of the separator and the buffer in the cell assembly can be flexibly and conveniently set. The buffer and the separator can work together to provide good support and buffering for multiple soft-pack battery cells, which makes the battery assembly more convenient and the battery device can operate stably.

[0104] In one example of this application, in the first direction, one of the buffer and the separator is provided between any two adjacent pouch battery cells, and the buffer and the separator in the cell assembly are alternately arranged along the first direction.

[0105] In this embodiment, a buffer or separator is arranged between two adjacent pouch cells in the cell assembly. The buffer and separator are arranged alternately in the first direction. The structure is simple and makes the arrangement of the separator and buffer in the cell assembly more balanced. This allows each pouch cell in the cell assembly to receive stable and reliable support and buffering, thereby improving the overall structural stability of the cell assembly and making the battery device operate more stably and have better thermal management performance.

[0106] In some examples of this application, the buffer covers more than 80% of the surface area on the thickness side of the pouch cell.

[0107] In this embodiment, the buffer covers more than 80% of the surface area of ​​the thickness side of the pouch battery cell, so that the pouch battery cell and the buffer can form a large buffer mating area. This allows the buffer to cover most of the surface of the pouch battery cell on one side in the first direction, thereby enabling the buffer to provide a stable and effective buffering effect on the pouch battery cell.

[0108] In some embodiments of this application, the pouch cell has conductive elements at both ends in a third direction, the conductive elements are electrically connected to the electrode assembly and are at least partially exposed outside the membrane shell, and the conductive elements on the same side of two adjacent pouch cells in the cell assembly are connected.

[0109] In this embodiment, by connecting the conductive parts on the same side of two adjacent pouch battery cells, it is possible to meet the different electrical connection methods of multiple pouch battery cells in the cell group, making the electrical connection of multiple pouch battery cells more convenient and easier.

[0110] In one embodiment of this application, the cell assembly includes at least three pouch cell units, and the pouch cell located between two adjacent pouch cell units in the cell assembly is an intermediate cell. Of the two conductive elements at both ends of the intermediate cell, one conductive element is connected to a conductive element on the same side of an adjacent pouch cell unit, and the other conductive element is connected to a conductive element on the same side of another adjacent pouch cell unit.

[0111] In this embodiment, one conductive element of the intermediate cell is connected to the same-side conductive element of an adjacent soft-pack battery cell, and the other conductive element of the intermediate cell is connected to the same-side conductive element of another adjacent soft-pack battery cell. The structure is simple and the connection relationship is clear and straightforward. This allows each conductive element to be connected individually, thereby reducing the probability of problems such as confusing connection relationships and the need to add adapters when connecting multiple conductive elements in multiple soft-pack batteries. This makes it easy and convenient to connect multiple soft-pack battery cells, making the assembly of the cell assembly more efficient and convenient.

[0112] In one embodiment of this application, the two conductive elements constituting the connection are overlapped and connected, and at least one conductive element is in a bent shape.

[0113] In this embodiment, the two conductive components that form the connection are connected by overlapping, which can give the two conductive components a larger connection area, thereby making the connection between the two conductive components more stable and reliable. At least one conductive component is in a bent shape, which makes it easier and more convenient to connect the two conductive components.

[0114] In one embodiment of this application, the two conductive elements constituting the connection are connected by an adapter piece, which is in a curved shape.

[0115] In this embodiment, the two conductive components that form the connection are connected by an adapter plate, which can reduce the processing steps and procedures of the conductive components when connecting individual pouch battery cells. By using standardized production adapter plates, the connection process can be carried out quickly and efficiently, making it more convenient and efficient to connect multiple pouch battery cells, and thus improving the production efficiency of the cell assembly.

[0116] In one embodiment of this application, the connection is curved, and the curved shape is U-shaped.

[0117] In this embodiment, the connection between the two connected conductive components is formed into a curved shape, specifically a U-shape. This structure is simple, easy to process and shape, and effectively reduces stress concentration at the connection point, making the connection between the two components more stable and reliable.

[0118] In one embodiment of this application, the two tabs extending from both ends of the pouch cell have opposite polarities, and the two conductive elements connected together have the same or opposite polarities.

[0119] In this embodiment, the two tabs extending from both ends of the pouch battery cell have opposite polarities to meet the usage requirements of the pouch battery cell. The polarities of the two conductive parts that are connected together are the same or opposite, which allows multiple pouch battery cells to be flexibly connected and assembled as needed.

[0120] In one embodiment of this application, there are multiple battery cell groups, with at least two battery cell groups arranged in a third direction, wherein the conductive elements of two adjacent pouch battery cells are directly connected along the third direction.

[0121] In this embodiment, the conductive components of two adjacent pouch cell units are directly connected along a third direction. The structure is simple and the connection is convenient and easy. This can greatly reduce the steps and processes of bending the conductive components of two adjacent pouch cell units for connection during production, or the number of adapters used for connection, thus making the production efficiency of the cell assembly higher.

[0122] In some embodiments of this application, the pouch cell is any one of a lithium iron phosphate cell, a ternary lithium cell, and a solid-state cell.

[0123] In this embodiment, the pouch battery cell is set to any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell, so that the pouch battery cell can be flexibly set to different types of battery cells as needed, thereby broadening the application scenarios of the pouch battery cell and enabling the battery device to better meet different usage requirements.

[0124] In one embodiment of this application, the pouch battery cell is a ternary lithium battery cell, and the battery device further includes a housing, in which a plurality of the pouch battery cells are housed. In a second direction, the housing is provided with a pressure relief area.

[0125] An energy storage device according to a third aspect of this application includes: a power conversion device and a battery device according to a second aspect of this application, the battery device being used to store or provide electrical energy.

[0126] According to the energy storage device of this application, by setting the battery device of the second aspect above, by setting the thickness of the membrane shell to 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 large thickness and the wall thickness of the membrane shell is small, thereby giving the soft-pack battery cell a high 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 the same size structure and structural performance, so that the two membrane portions can have a more balanced bearing capacity for stress generated in the cavity, making the overall structure of the membrane shell more stable and the mechanical strength and other structural performance better. Thus, the membrane shell can well meet the support and protection needs when the thickness of the soft-pack battery cell 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, thereby reducing the number of structural components such as support and heat conduction in the battery device, increasing the arrangement space of the soft-pack battery cell in the battery device, and thus greatly improving the overall energy density of the battery device.

[0127] An electrical device according to a fourth aspect of this application includes a battery device according to a second aspect of this application or an energy storage device according to a third aspect of this application, wherein the battery device is used to store or provide electrical energy.

[0128] According to the power device of this application, by setting the battery device of the second aspect or the energy storage device of the third aspect, and 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 large thickness and the wall thickness of the membrane shell is small, thereby giving the soft-pack battery cell a high 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 performance, so that the two membrane portions can have a more balanced bearing capacity for stress generated in the cavity, making the overall structure of the membrane shell more stable and its mechanical strength and other structural performance better. Thus, the membrane shell can well meet the support and protection needs when the thickness of the soft-pack battery cell 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, thereby reducing the number of supporting, heat-conducting and other structural components in the battery device, increasing the arrangement space of the soft-pack battery cells in the battery device, and thus greatly improving the overall energy density of the battery device.

[0129] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0130] Figure 1 is a schematic diagram of a single soft-pack battery cell according to an embodiment of this application;

[0131] Figure 2 is a magnified view of a portion of point A shown in Figure 1;

[0132] Figure 3 is a schematic diagram of a single soft-pack battery cell from another angle according to an embodiment of this application;

[0133] Figure 4 is a magnified view of part B shown in Figure 3;

[0134] Figure 5 is a schematic diagram of a single soft-pack battery cell from another angle according to an embodiment of this application;

[0135] Figure 6 is a schematic diagram of a battery device according to an embodiment of this application;

[0136] Figure 7 is a schematic diagram of the battery pack, heat exchange plate, separator and buffer according to an embodiment of this application;

[0137] Figure 8 is a magnified view of a portion of point C shown in Figure 7;

[0138] Figure 9 is a schematic diagram of two pouch cell units and a heat exchange plate of adjacent cell groups according to an embodiment of this application;

[0139] Figure 10 is a magnified view of a portion of point D shown in Figure 9;

[0140] Figure 11 is a schematic diagram of the battery cell assembly, separator, and buffer according to an embodiment of this application;

[0141] Figure 12 is a partially enlarged schematic diagram of point E shown in Figure 11;

[0142] Figure 13 is a schematic diagram of the battery cell assembly, separator, buffer, and adapter plate according to an embodiment of this application;

[0143] Figure 14 is a partially enlarged schematic diagram of point F shown in Figure 13;

[0144] Figure 15 is a partially enlarged schematic diagram of a soft-pack battery cell and a blocking member according to an embodiment of this application;

[0145] Figure 16 is a schematic diagram of an electrical device according to an embodiment of this application.

[0146] Reference numerals: 10, Soft-pack battery cell; 11, Membrane housing; 1101, Sealing boss; 111, Membrane section; 1111, Sealing edge; 1112, Side wall; 11121, First arc segment; 11122, Straight segment; 11123, Second arc segment; 1113, Bottom wall; 12, Conductive component; 20, Separator; 30, Buffer component; 40, Adhesive layer; 50, Heat exchange plate; 60, Housing; 70, Adapter plate; 80, Blocking component; 100, Battery assembly; 200, Motor; 300, Controller; 1000, Electrical device. Detailed Implementation

[0147] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0148] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0149] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0150] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0151] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0152] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0153] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0154] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0155] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing. Among the power batteries currently in use, lithium-ion batteries account for an increasingly larger proportion.

[0156] When the battery cells in a battery device are pouch cells, because pouch cells are easily deformed, support structures, heat conduction, and buffer structures are required to ensure that multiple pouch cells can be stacked stably and reliably and operate. Currently, the thickness of a single pouch cell is small, which means that a large number of pouch cells need to be set in the battery device. This results in a large number of support and heat conduction structural components in the battery device, thus reducing the overall energy density of the battery device.

[0157] Based on the above considerations, in order to improve the overall energy density of the battery device, this application designs a soft-pack battery cell. By increasing the thickness of the soft-pack battery cell, the energy density of the soft-pack battery cell is increased, thereby reducing the number of supporting, heat-conducting and other structural components arranged in the battery device with the same size specifications, increasing the proportion of the soft-pack battery cell in the battery device, and thus greatly improving the overall energy density of the battery device.

[0158] The pouch battery cells disclosed in this application can be used in electrical devices that use pouch battery cells as a power source, or in various energy storage systems that use battery devices as energy storage elements. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0159] For example, when the electrical device is a vehicle, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle has a battery pack installed inside, which can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the power supply from the battery pack to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0160] In some embodiments of this application, the battery device can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0161] In this application, a battery device refers to a single physical module comprising one or more pouch cell batteries to provide higher voltage and capacity. For example, the battery device mentioned in this application can be a battery module or a battery pack, etc.

[0162] The following description refers to Figures 1-16, illustrating a pouch cell 10 according to an embodiment of the first aspect of this application. Figure 1 is a schematic diagram of the pouch cell 10 according to an embodiment of this application; Figure 2 is a partially enlarged schematic diagram of point A shown in Figure 1; Figure 3 is a schematic diagram of the pouch cell 10 from another angle according to an embodiment of this application; Figure 4 is a partially enlarged schematic diagram of point B shown in Figure 3; Figure 5 is a schematic diagram of the pouch cell 10 from yet another angle according to an embodiment of this application; Figure 6 is a schematic diagram of a battery device 100 according to an embodiment of this application; Figure 7 is a schematic diagram of a cell assembly with a heat exchange plate 50, a separator 20, and a buffer 30 according to an embodiment of this application; Figure 8 is a partially enlarged schematic diagram of point C shown in Figure 7; Figure 9 is a schematic diagram of adjacent cells according to an embodiment of this application. Figure 10 is a schematic diagram of two pouch cell 10s and a heat exchange plate 50 in a battery cell assembly; Figure 11 is a schematic diagram of a battery cell assembly, separator 20, and buffer 30 according to an embodiment of this application; Figure 12 is a partial enlarged schematic diagram of a point E in Figure 11; Figure 13 is a schematic diagram of a battery cell assembly, separator 20, buffer 30, and adapter 70 according to an embodiment of this application; Figure 14 is a partial enlarged schematic diagram of a point F in Figure 13; Figure 15 is a partial enlarged schematic diagram of a pouch cell 10 and a blocking member 80 according to an embodiment of this application; Figure 16 is a schematic diagram of an electrical device 1000 according to an embodiment of this application.

[0163] First, a battery device 100 according to a second aspect embodiment of the present application is described with reference to Figures 1-16. As shown in Figure 7, the battery device 100 according to an embodiment of the present application includes a cell assembly, which includes a plurality of pouch cell 10 stacked along a first direction (x direction as shown in Figure 7), wherein the first direction can be the thickness direction of the pouch cell 10.

[0164] The pouch cell 10 according to an embodiment of the first aspect of this application is described below with reference to Figures 1-16.

[0165] As shown in Figures 1-16, the pouch cell 10 according to an embodiment of this application 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. Each membrane portion 111 defines a receiving groove. The receiving grooves of the two membrane portions 111 are arranged facing each other in the first direction and together form the receiving cavity of the membrane shell 11. The electrode assembly is disposed in the receiving cavity. The dimension of the pouch cell 10 in the first direction is a first dimension, and the dimension of any membrane portion 111 in the first direction is a second dimension. The first dimension is greater than or equal to 5 mm and less than or equal to 70 mm, and the ratio of the second dimension to the first dimension is greater than or equal to 0.4 and less than or equal to 0.6.

[0166] In this embodiment, the pouch cell 10 includes a housing 11 and an electrode assembly. The housing 11 can be an aluminum-plastic film. Two film portions 111 connected in the first direction can be formed by punching holes in the aluminum-plastic film substrate. Both film portions 111 define receiving grooves. The housing 11 can be formed by double punching holes. The receiving grooves of the two film portions 111 are arranged facing each other in the first direction and together form the receiving cavity of the housing 11. The electrode assembly is placed in the receiving cavity. For example, during the production and processing of the pouch cell 10, the housing 11 can form two film portions 111 with receiving grooves by double punching holes. The electrode assembly is placed in the receiving groove of one of the film portions 111, and the other film portion 111 is folded towards the film portion 111 that receives the electrode assembly, so that the two receiving grooves cooperate to form a receiving cavity. The pouch cell 10 then undergoes subsequent hot-pressing, edge sealing, liquid injection and other production processes. The two film portions 111 form a sealed receiving cavity through edge sealing 1111, thereby forming a complete housing 11.

[0167] 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 dimension of the soft-pack battery cell 10 in the first direction is the first dimension, which is the thickness dimension of the soft-pack battery cell 10. The first dimension is greater than or equal to 5 mm and less than or equal to 70 mm. Referring to Figure 4, d1 in the figure represents the first dimension, and d1 can be 5 mm, 6 mm, 10 mm, 12 mm, 17 mm, 25 mm, 30 mm, 40 mm, 47 mm, 53 mm, 60 mm, 65 mm, 70 mm, etc. The dimension of any membrane part 111 in the first direction is the second dimension. The second dimensions of the two membrane parts 111 can be set to be the same or different as needed. Since the soft-pack battery cell 10 is composed of two membrane parts 111 forming the membrane shell 11, the overall dimension of the two membrane parts 111 in the first direction is the first dimension. That is to say, the sum of the second dimensions of the two membrane parts 111 is equal to the first dimension.

[0168] In this embodiment, the ratio of the second dimension to the first dimension is greater than or equal to 0.4 and less than or equal to 0.6. Referring to Figure 4, where d2 represents the second dimension, the ratio of d2 to d1 can be 0.4, 0.45, 0.5, 0.52, 0.54, 0.55, 0.6, etc. The second dimension of the other membrane portion 111, corresponding to the ratio of the first dimension, can be 0.6, 0.55, 0.5, 0.48, 0.46, 0.45, 0.4, etc.

[0169] The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The pouch cell 10 mainly relies on the movement of metal ions between the positive and negative electrode to operate. The positive electrode includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector.

[0170] In this embodiment, by setting the wall thickness of the membrane shell 11 to less than or equal to 0.2 mm, the volume ratio of the membrane shell 11 in the pouch battery cell 10 is smaller and the weight is lighter, while the volume and weight ratio of the electrode assembly in the pouch battery cell 10 is larger, thereby significantly improving the energy density of the pouch battery cell 10. The first dimension is set to greater than or equal to 5 mm and less than or equal to 70 mm, resulting in a thicker pouch battery cell 10. This, combined with the thinner membrane shell 11, allows the pouch battery cell 10 to have a higher energy density. Furthermore, the thickness of the pouch battery cell 10 can be flexibly set within a wide range as needed, enabling the pouch battery cell 10 to better meet the usage requirements of battery devices 100 of different sizes and specifications.

[0171] In this 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 both membrane portions 111 can maintain sufficient mechanical strength to meet the molding requirements of the membrane shell 11. Thus, when the first dimension of the soft-pack battery cell 10 in this embodiment is set to be greater than or equal to 5 mm and less than or equal to 70 mm, a stable and reliable membrane shell 11 is formed.

[0172] In this embodiment, by setting the thickness of the membrane shell 11 to 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 multiple thinner soft-pack battery cells 10, the number of soft-pack battery cells 10 arranged in this embodiment is smaller, thereby reducing the proportion of the membrane shell 11, and thus enabling multiple soft-pack battery cells 10 in the same volume to have a larger energy density.

[0173] For example, in this embodiment, the first dimension of the soft-pack battery cell 10 is 5mm, while the first dimension of the thinner soft-pack battery cell 10 is 1mm. When arranging 5mm soft-pack battery cells 10 along the first direction, 5 thinner soft-pack battery cells 10 need to be provided, that is, they have 5 shell structures. However, in this embodiment, only 1 soft-pack battery cell 10 needs to be arranged, that is, it contains only one shell structure. Thus, the energy density of the soft-pack battery cells 10 is greatly improved when they are arranged.

[0174] It is understandable that the volume ratio of the membrane shell 11 in the pouch cell 10 is closely related to the wall thickness of the membrane shell 11 and the overall size of the pouch cell 10. For example, when membrane shells 11 with the same wall thickness are provided in pouch cells 10 of different sizes, the volume ratio of the membrane shell 11 in the smaller pouch cell 10 is larger, while the volume ratio of the membrane shell 11 in the larger pouch cell 10 is smaller. This results in the smaller pouch cell 10 having a lower energy density and the larger pouch cell 10 having a higher energy density. On the other hand, in pouch cells 10 of the same size, the greater the wall thickness of the membrane shell 11, the greater the volume ratio of the membrane shell 11 in the pouch cell 10, and the lower the energy density of the pouch cell 10.

[0175] 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. This allows the soft-pack battery cell 10 to have a large dimension in the first direction while the wall thickness of the membrane shell 11 is small, thereby enabling the soft-pack battery cell 10 to have a high energy density.

[0176] When the size of the pouch cell 10 is too large, the requirements for the material strength and mechanical strength of the membrane shell 11 are higher, and the wall thickness of the membrane shell 11 needs to be increased according to the actual situation. This makes it possible for the energy density of the pouch cell 10 to decrease. In this embodiment, the first size of the pouch 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. This allows the pouch cell 10 to be set to a larger size as needed when the wall thickness of the membrane shell 11 is small, thereby enabling the pouch cell 10 to maintain a high energy density.

[0177] In this embodiment, the dimension of any one of the two membrane portions 111 in the membrane shell 11 is set to a second dimension in the first direction, 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 two membrane portions 111 have similar or identical dimensions and the space size of the cavity formed by the two membrane portions 111 is relatively similar or identical. This allows the two membrane portions 111 to have similar or identical structural performance, and the two membrane portions 111 provide more consistent support for the pouch battery cell 10. Furthermore, the two membrane portions 111 of the membrane shell 11 can have a more balanced distribution and bearing capacity for internal stresses, thereby making the overall structure of the membrane shell 11 more stable and giving the membrane shell 11 better mechanical strength and other structural performance. Thus, the membrane shell 11 can reliably and stably meet the support and protection needs of the pouch battery cell 10 when the first dimension is set to be greater than or equal to 5mm and less than or equal to 70mm, provided that the wall thickness is less than or equal to 0.2mm. This allows the pouch battery cell 10 of this embodiment to reliably and stably improve the energy density of the pouch battery cell 10 while having good structural performance.

[0178] In this embodiment, when the pouch battery cell 10 is assembled in the battery device 100, the battery device 100 can achieve a greater energy density with fewer pouch battery cells 10 in the same arrangement space. Furthermore, due to the reduction in the number of pouch battery cells, the number of supporting structures and structural components such as heat conduction and bonding for supporting the pouch battery cells 10 is also significantly reduced. This allows for a larger space in the battery device 100 to arrange the pouch battery cells 10, thereby significantly improving the overall energy density of the battery device 100.

[0179] According to the embodiments of this application, the soft-pack battery cell 10 has a relatively large thickness and a relatively small wall thickness 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. This results in a high energy density for the soft-pack battery cell 10. Simultaneously, 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, ensuring that the two membrane portions 111 of the membrane shell 11 have similar or identical dimensions, structures, and structural performance. This allows the two membrane portions 111 to accommodate the contents within the cavity. The generated stresses have a relatively balanced bearing capacity, making the overall structure of the membrane shell 11 more stable and its mechanical strength and other structural properties better. This allows the membrane shell 11 to well meet the support and protection needs of the pouch battery cell 10 when the thickness is large, even with a wall thickness of less than or equal to 0.2 mm. This can reliably improve the energy density of the pouch battery cell 10, thereby reducing the number of supporting and heat-conducting structural components in the battery device 100 and increasing the arrangement space of the pouch battery cell 10 in the battery device 100, thus greatly improving the overall energy density of the battery device 100.

[0180] In some embodiments of this application, referring to FIG4, the ratio of the second dimension to the first dimension may be greater than or equal to 0.45 and less than or equal to 0.55.

[0181] In this embodiment, the ratio of the second dimension to the first dimension 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.

[0182] 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 facilitates processing and manufacturing. It also ensures that the receiving grooves of the two membrane portions 111 have sufficient depth for the arrangement of electrode assemblies, and maintains relatively consistent mechanical strength of the two membrane portions 111. This makes the overall structure of the membrane housing 11 more stable and reliable, thereby enabling the soft-pack battery cell 10 to operate and be used stably and reliably.

[0183] In one embodiment of this application, referring to FIG4, the ratio of the second dimension to the first dimension can be 0.5.

[0184] In this embodiment, the ratio of the first dimension to the first dimension is 0.5, that is, the two membrane portions 111 have the same dimension in the first direction, the two membrane portions 111 can form a symmetrical structure, and the receiving grooves of the two membrane portions 111 also have the same dimension.

[0185] In this embodiment, the ratio of the second dimension to the first dimension is set to 0.5, so that the two membrane parts 111 can have the same structure, which makes the processing and molding of the membrane shell 11 more convenient, and the two membrane parts 111 can have consistent mechanical strength and structural performance, thereby improving the overall structural stability and reliability of the membrane shell 11 and making the soft-pack battery cell 10 operate more stably.

[0186] In some embodiments of this application, referring to Figures 4 and 8, the first dimension can be greater than or equal to 15 mm and less than or equal to 45 mm.

[0187] In this embodiment, the first dimension is set to be greater than or equal to 15mm and less than or equal to 45mm. For example, d1 can be 15mm, 16mm, 20mm, 25mm, 35mm, 40mm, 42mm, 45mm, etc.

[0188] In this embodiment, the first dimension is set to be greater than or equal to 15mm and less than or equal to 45mm, so that the soft-pack battery cell 10 has a larger thickness, which can greatly improve the energy density of the battery device 100 and reduce the probability of the soft-pack battery cell 10's structural stability decreasing due to excessive thickness, so that the soft-pack battery cell 10 has a suitable thickness for stable and reliable operation.

[0189] In some embodiments of this application, referring to FIG4, the second dimension may be greater than or equal to 3 mm and less than or equal to 35 mm.

[0190] The second dimension is greater than or equal to 3mm and less than or equal to 35mm. For example, d2 can be 3mm, 5mm, 6mm, 8mm, 15mm, 30mm, 35mm, etc.

[0191] In this embodiment, the second dimension is set to be greater than or equal to 3 mm and less than or equal to 35 mm, so that the two membrane portions 111 can cooperate to form a membrane shell 11 of the required thickness for the soft-pack battery, thus meeting the setting requirements of the soft-pack battery cell 10.

[0192] In one embodiment of this application, referring to FIG4, the second dimension can be greater than or equal to 7 mm and less than or equal to 22 mm.

[0193] In this embodiment, the second dimension is further limited to greater than or equal to 7mm and less than or equal to 22mm. For example, d2 can be 7mm, 8mm, 10mm, 12mm, 15mm, 20mm, 22mm, etc.

[0194] 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, thereby enabling the membrane portion 111 to have good mechanical strength and structural stability, thus making the overall structure of the membrane housing 11 more stable and reliable, and enabling the electrode assembly to be stably and reliably arranged in the receiving cavity, thereby making the operation of the soft-pack battery cell 10 more stable.

[0195] In some embodiments of this application, as shown in Figures 2 and 4, the membrane portion 111 may include: a sealing edge 1111, a side wall 1112, and a bottom wall 1113. The sealing edge 1111 and the bottom wall 1113 are spaced apart in a 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 periphery of the bottom wall 1113, and the other end extends along the first direction to connect with the sealing edge 1111. The sealing edge 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. At least a portion of the electrode assembly is disposed in the receiving groove.

[0196] In this embodiment, the film portion 111 includes 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 a first direction and connected by the side wall 1112. The sealing edge 1111 can be arranged on the side of the bottom wall 1113 facing the other film portion 111, and the sealing edges 1111 of the two film portions 111 can abut and fit together. The sealing edge 1111, side wall 1112, and bottom wall 1113 cooperate to enclose a receiving groove that is open on one side in the first direction. The bottom wall 1113 can form the bottom wall 1113 surface of the receiving groove, and the side wall 1112 can form the inner side wall 1112 surface of the receiving groove. The openings of the receiving grooves of the two membrane portions 111 are opposite to each other in the first direction, so that the side walls 1112 of the two membrane portions 111 cooperate to form the inner side wall 1112 surface of the receiving cavity. The two bottom walls 1113 respectively form the two bottom wall 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. The electrode assembly is arranged in the receiving cavity formed by the cooperation of the two receiving grooves.

[0197] During the processing of the soft-pack battery cell 10, the two membrane portions 111 can be sealed by the sealing edge 1111. For example, the sealing edges 1111 of the two membrane portions 111 arranged opposite each other in the first direction can be connected by heat pressing, thereby sealing the circumferential direction of the cavity.

[0198] In this embodiment, the membrane portion 111 includes a sealing edge 1111, a side wall 1112, and a bottom wall 1113. The structure is simple and can well meet the forming requirements of the receiving groove and the receiving cavity, so that the processing of the membrane shell 11 can be carried out smoothly and meet the processing and manufacturing requirements of the soft-pack battery cell 10.

[0199] In one embodiment of this application, as shown in FIG4, the sidewall 1112 may include a first arc segment 11121, a straight segment 11122 and a second arc segment 11123 connected sequentially along a first direction. The straight segment 11122 extends along a straight line in the first direction. The straight segment 11122 is connected to the edge sealing 1111 by an arc through the first arc segment 11121 and the straight segment 11122 is connected to the bottom wall 1113 by an arc through the second arc segment 11123.

[0200] In this embodiment, the sidewall 1112 includes a first arc segment 11121, a straight segment 11122, and a second arc segment 11123 connected sequentially along a first direction. The straight segment 11122 extends in a straight line along the first direction and is connected to the sealing edge 1111 by an arc through the first arc segment 11121. It is connected to the bottom wall 1113 by an arc through the second arc segment 11123. That is, the sidewall 1112 and the sealing edge 1111 can be connected with rounded corners, and the sidewall 1112 and the bottom wall 1113 can also be connected with rounded corners. When the electrode assembly is assembled into the receiving groove, the electrode assembly can move from the opening of the receiving groove into the receiving groove along the depth direction of the receiving groove.

[0201] In this embodiment, the sidewall 1112 is provided with a straight segment 11122 extending along the first direction, which can play a good guiding role in the movement and assembly of the electrode assembly, and facilitate the arrangement of the electrode assembly in the receiving groove, so that the space of the receiving groove can be fully utilized. The first arc segment 11121 and the second arc segment 11123 can work together with the first straight segment 11122 to play a good guiding role, reducing the probability of rubbing damage when the electrode assembly is installed in the receiving groove, and enabling the assembled soft-pack battery cell 10 to operate stably.

[0202] In some examples of this application, referring to Figure 4, 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 can be greater than or equal to 0.6 and less than or equal to 0.9.

[0203] In this embodiment, the ratio of the third dimension to the second dimension of the straight line segment 11122 in the first direction is set to be greater than or equal to 0.6 and less than or equal to 0.9. Referring to Figure 4, d3 in the figure represents the third dimension, and the ratio of d3 to d2 can be 0.6, 0.65, 0.7, 0.8, 0.9, etc.

[0204] In this embodiment, by setting the ratio of the third dimension to the second dimension of the straight segment 11122 in the first direction to be greater than or equal to 0.6 and less than or equal to 0.9, the receiving groove is formed by the side wall 1112 of the straight segment 11122 in the first direction, which occupies a large proportion of the receiving groove space. This allows the space in the receiving groove to be more fully utilized when the electrode assembly is arranged in the receiving groove, and the arrangement of the electrode assembly and the membrane shell 11 can be more compact. This can further improve the energy density of the soft-pack battery cell 10 to a certain extent.

[0205] In one example of this application, referring to Figure 4, the ratio of the third dimension to the second dimension can be greater than or equal to 0.7 and less than or equal to 0.85.

[0206] In this embodiment, the ratio of the third dimension to the second dimension is further limited to 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.

[0207] 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 receiving groove has a larger receiving space enclosed by the straight segment 11122 in the first direction, so that the space of the receiving 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 segment 11122 and the sealing edge 1111 and the bottom wall 1113, so that the electrode assembly and the membrane shell 11 are assembled more smoothly and conveniently.

[0208] In some examples of this application, referring to Figure 4, the dimension of the straight line segment 11122 in the first direction is the third dimension, which can be greater than or equal to 5 mm and less than or equal to 30 mm.

[0209] In this embodiment, the third dimension is set to be greater than or equal to 5mm and less than or equal to 30mm. For example, d3 can be 5mm, 6mm, 6.5mm, 7mm, 8mm, 10mm, 15mm, 17mm, 21mm, 25mm, 30mm, etc.

[0210] In this embodiment, the third dimension of the straight segment 11122 along the first direction is set to be greater than or equal to 5mm and less than or equal to 30mm, 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.

[0211] In one example of this application, referring to Figure 4, the third dimension can be greater than or equal to 7 mm and less than or equal to 18 mm.

[0212] In this embodiment, the third dimension is set to be greater than or equal to 7mm and less than or equal to 18mm. For example, d3 can be 7mm, 8mm, 10mm, 12mm, 13mm, 18mm, etc.

[0213] In this embodiment, the third dimension is further limited to 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 requirements of the soft-pack battery cell 10.

[0214] In some examples of this application, the radius of the first arc segment 11121 can be greater than or equal to 1.5 mm, and the radius of the second arc segment 11123 can be greater than or equal to 1.5 mm.

[0215] In this embodiment, the radius of the first arc segment 11121 is greater than or equal to 1.5mm, and the radius of the second arc segment 11123 is greater than or equal to 1.5mm. For example, the radius of the first arc segment 11121 can be 1.5mm, 1.6mm, 1.7mm, 2mm, 3mm, etc., and the radius of the second arc segment 11123 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2mm, 3mm, etc.

[0216] 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. This allows for the formation of sufficiently large transition arc segments between the straight segment 11122 and the edge sealing 1111, as well as between the straight segment 11122 and the bottom wall 1113. This makes the connection between the straight segment 11122 and the bottom wall 1113 and the edge sealing 1111 more stable and reliable, and allows the first arc segment 11121 and the second arc segment 11123 to play a better guiding role.

[0217] In some embodiments of this application, referring to FIG5, the width dimension of the pouch cell 10 in the second direction (the z-direction as shown in FIG5) can be less than or equal to 200 mm.

[0218] In this embodiment, the width of the pouch battery cell 10 in the second direction is less than or equal to 200mm. Referring to Figure 5, h1 in the figure represents the width of the pouch battery cell 10 in the second direction. h1 can be 200mm, 180mm, 170mm, 165mm, 150mm, 120mm, etc.

[0219] In this embodiment, the width of the pouch battery cell 10 in the second direction is set to be less than or equal to 200 mm. This allows the pouch battery cell 10 to have a smaller size in the second direction while meeting the energy density requirements of the battery device 100. Consequently, the overall size of the battery device 100 in the second direction is smaller, and the overall structure of the battery device 100 is flatter. This makes it easier and more convenient to arrange the battery device 100 in electrical devices 1000 such as vehicles and energy storage devices.

[0220] In some embodiments of this application, referring to FIG5, the length of the pouch cell 10 in a third direction (y direction as shown in FIG5) can be less than or equal to 650 mm.

[0221] In this embodiment, the length of the soft-pack battery cell 10 in the third direction is set to be less than or equal to 650mm. Referring to Figure 5, L1 in the figure represents the width of the soft-pack battery cell 10 in the second direction. L1 can be 650mm, 640mm, 630mm, 600mm, 550mm, etc.

[0222] In this embodiment, the length of the pouch battery cell 10 in the third direction is set to be less than or equal to 650 mm. This allows the pouch battery cell 10 to have a stable structural state while meeting the energy density requirements of the battery device 100, reducing the probability of mechanical stress and other problems caused by excessive length of the pouch battery cell 10, and enabling the pouch battery cell 10 to operate stably and reliably.

[0223] In some embodiments of this application, referring to FIG5, the width dimension of the pouch cell 10 in the second direction can be less than or equal to 200 mm, and the length dimension of the pouch cell 10 in the third direction can be less than or equal to 650 mm. The third direction intersects the second direction and the first direction in pairs.

[0224] In this embodiment, the width dimension of the soft-pack battery cell 10 in the second direction is less than or equal to 200mm. For example, h1 can be 200mm, 180mm, 170mm, 165mm, 150mm, 120mm, etc. The length dimension of the soft-pack battery cell 10 in the third direction is set to be less than or equal to 650mm. For example, L1 can be 650mm, 640mm, 630mm, 600mm, 550mm, etc.

[0225] The third direction intersects with both the second and first directions in pairs, which is intended to show that the first and second directions can be arranged perpendicularly or only intersecting at non-perpendicular angles, i.e., intersecting at acute or obtuse angles. For example, the first and second directions can be arranged at angles of 30°, 60°, 80°, 120°, 150°, or 170°. The first direction and the third direction can be arranged perpendicularly or only intersecting at non-perpendicular angles, i.e., intersecting at acute or obtuse angles. For example, the first direction and the third direction can be arranged at angles of 30°, 60°, 80°, 120°, 150°, or 170°. The second direction and the third direction can be arranged perpendicularly or only intersecting at non-perpendicular angles, i.e., intersecting at acute or obtuse angles. For example, the second direction and the third direction can be arranged at angles of 30°, 60°, 80°, 120°, 150°, or 170°.

[0226] In this embodiment, by setting the width of the soft-pack battery cell 10 in the second direction to less than or equal to 200 mm and the length of the soft-pack battery cell 10 in the third direction to 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 maintaining overall structural stability. This makes the battery device 100 more convenient to arrange and more stable to operate.

[0227] In some embodiments of this application, as shown in Figures 2 and 4, the end face of at least one end of the membrane shell 11 in the second direction may be formed with a sealing boss 1101. The sealing boss 1101 is configured to be formed by folding the sealing edges 1111 of the two membrane portions 111, and the second direction intersects with the first direction.

[0228] In this embodiment, a sealing boss 1101 is formed on the end face of at least one end of the membrane shell 11 in the second direction. For example, in the second direction, a sealing boss 1101 can be formed on one end face of the membrane shell 11, or the membrane shell 11 can have sealing bosses 1101 formed on both end faces. The sealing boss 1101 is configured to be formed by folding the sealing edges 1111 of two membrane portions 111. After the two membrane portions 111 are fitted together to form the membrane shell 11 and the sealing edges 1111 are hot-pressed, the sealing edges 1111 of the two membrane portions 111 are hot-pressed into one piece. The one-piece sealing edge 1111 can form the sealing boss 1101 by folding or rolling. The sealing boss 1101 can not extend beyond the bottom wall 1113 of the two membrane portions 111 in the first direction.

[0229] When the pouch battery cell 10 is arranged in the battery device 100, when the two end faces of the pouch battery cell 10 in the second direction are assembled with the support components or electrical connectors, the size of the sealing boss 1101 in the second direction is much smaller than the size of the unfolded sealing edge 1111. The size of the sealing boss 1101 formed by folding the sealing edge 1111 in the second direction is so small that it can be ignored. This allows the two end faces of the pouch battery cell 10 to be well matched with the support components for assembly and arrangement, making it more convenient and easier to arrange the pouch battery cell 10.

[0230] In this embodiment, a sealing boss 1101 is formed on the end face of at least one end of the membrane shell 11 in the second direction. This can effectively reduce the space occupied by the sealing boss 1111 in the second direction and the interference to the arrangement of the soft-pack battery cell 10. This makes the overall size of the soft-pack battery cell 10 smaller in the second direction, which facilitates the arrangement of the soft-pack battery cell 10 in the battery device 100. In addition, the sealing boss 1101 can improve the sealing reliability of the cavity to a certain extent, so that the soft-pack battery cell 10 has a more stable sealing effect.

[0231] In one embodiment of this application, the protrusion height of the edge sealing boss 1101 in the second direction may be less than or equal to 0.5 mm.

[0232] In this embodiment, the protrusion height of the edge sealing boss 1101 in the second direction is less than or equal to 0.5mm. Here, the protrusion height refers to the distance 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 0.5mm, 0.4mm, 0.35mm, 0.34mm, 0.3mm, 0.2mm, etc.

[0233] In this embodiment, the protrusion height of the sealing boss 1101 in the second direction is set to be less than or equal to 0.5mm, so that the protrusion size of the sealing boss 1101 on the soft-pack battery cell 10 is very small. This allows the end of the soft-pack battery cell 10 with the sealing boss 1101 in the second direction to still be easily assembled with support, fixing and other structures, making it more convenient and easier to assemble the soft-pack battery cell 10 in the battery device 100.

[0234] In some embodiments of this application, as shown in FIG1, the pouch cell 10 may have conductive elements 12 at both ends in a third direction. The conductive elements 12 are electrically connected to the electrode assembly and are at least partially exposed outside the membrane shell 11. The third direction intersects with the first direction.

[0235] In this embodiment, the pouch battery cell 10 has conductive elements 12 at both ends in the third direction. The conductive elements 12 are electrically connected to the electrode assembly and are at least partially exposed outside the membrane housing 11. For example, the conductive elements 12 arranged at both ends of the pouch battery cell 10 in the third direction can be connected to the positive electrode tab and the negative electrode tab in the electrode assembly, respectively. The pouch battery cell 10 can supply power to the outside or be charged by the outside through the two conductive elements 12.

[0236] In this embodiment, conductive elements 12 are respectively provided at both ends of the soft-pack battery cell 10 in the third direction. The conductive elements 12 are electrically connected to the electrode assembly. The structure is simple and can well meet the usage requirements of the soft-pack battery cell 10.

[0237] In one embodiment of this application, referring to Figures 1 and 2, the portion of the conductive element 12 exposed outside the membrane housing 11 can be a lead-out portion, which is formed in the form of a sheet.

[0238] In this embodiment, the portion of the conductive element 12 exposed outside the membrane shell 11 is the lead-out portion. The lead-out portion is sheet-shaped, and the thickness direction of the lead-out portion can be in the same direction 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 as needed through the conductive portion.

[0239] In this embodiment, the lead-out portion is set as a sheet, so that the lead-out portion can have a large electrical connection surface, so that the lead-out portion can be conveniently and reliably electrically connected to other electrical connectors or conductive components 12.

[0240] In some examples of this application, referring to Figures 1 and 2, the two end faces of the lead in the second direction and the end face of the lead in the third direction away from the electrode assembly can be rounded.

[0241] In this embodiment, the two end faces of the lead-out portion in the second direction are respectively rounded with the end face of the lead-out portion in the third direction away from the electrode assembly. In other words, the two end corners of the lead-out portion in the second direction are rounded along the end of the lead-out portion away from the electrode assembly in the third direction, and a rounded transition is formed between the end face of the lead-out portion away from the electrode assembly and the two end faces of the lead-out portion in the second direction.

[0242] In this embodiment, the two end faces of the lead-out portion in the second direction and the end face of the lead-out portion in the third direction away from the electrode assembly are respectively rounded. This can effectively disperse the stress on the lead-out portion and reduce the risk of scratches on the soft-pack battery cell 10 and operators caused by sharp edges of the lead-out portion. This allows the lead-out portion to be connected to the electrode more conveniently and stably.

[0243] In one embodiment of this application, referring to Figures 1 and 2, the portion of the conductive element 12 exposed outside the membrane housing 11 is a lead-out portion, which can be a flexible structure.

[0244] In this embodiment, the lead-out portion of the conductive element 12 is configured as a flexible structure, such as a flexible copper foil, a nickel-plated copper strip, or a flexible conductive polymer, etc.

[0245] In this embodiment, the lead-out portion is set as a flexible structure, which makes it more convenient to make electrical connections to the lead-out portion and allows the lead-out portion to better adapt to the electrical connection needs of different angles and directions, thereby making it more convenient and reliable to make electrical connections between the soft-pack battery cell 10 and other soft-pack battery cells 10 or external circuits.

[0246] In one embodiment of this application, referring to FIG4, the portion of the conductive element 12 exposed outside the membrane housing 11 is a lead-out portion, and the thickness of the lead-out portion can be 0.1 mm to 0.5 mm.

[0247] 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. Referring to Figure 4, d4 in the figure represents the thickness of the lead-out portion, and d4 can be 0.1 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.5 mm, etc.

[0248] In this embodiment, the thickness of the lead-out portion is set to 0.1mm to 0.5mm, so that the lead-out portion has sufficient flow area to meet the electrical connection requirements, and the lead-out portion has sufficient mechanical strength to make stable and reliable electrical connections. It also reduces the probability of problems such as inconvenient connection and increased cost caused by excessively thick lead-out portions, so that the lead-out portion can make stable and convenient electrical connections.

[0249] In one embodiment of this application, referring to FIG5, the portion of the conductive element 12 exposed outside the membrane housing 11 is a lead-out portion, and the width of the lead-out portion in the second direction can be 20mm to 60mm.

[0250] In this embodiment, the width of the lead-out portion in the second direction is set to be greater than or equal to 20mm and less than or equal to 60mm. Referring to Figure 5, h2 in the figure represents the width of the lead-out portion in the second direction. h2 can be 20mm, 23mm, 25mm, 26mm, 30mm, 35mm, 45mm, 50mm, 55mm, 60mm, etc.

[0251] In this embodiment, the width of the lead-out portion in the second direction is set to 20mm-60mm, so that the lead-out portion has sufficient size in the second direction for convenient electrical connection operations, and reduces the probability that the lead-out portion is too wide and difficult to bend, causing inconvenience in electrical connection operations, thereby enabling the lead-out portion to perform electrical connection operations flexibly and conveniently.

[0252] In one embodiment of this application, referring to FIG5, the portion of the conductive element 12 exposed outside the membrane housing 11 is a lead-out portion, and the length of the lead-out portion in the third direction can be 10mm to 50mm.

[0253] In this embodiment, the length of the lead-out portion in the third direction is set to 10mm to 50mm. Referring to Figure 5, L2 in the figure represents the length of the lead-out portion in the third direction. L2 can be 10mm, 12mm, 15mm, 20mm, 25mm, 30mm, 40mm, 50mm, etc.

[0254] In this embodiment, the length of the lead in the third direction is set to be greater than or equal to 10 mm, so that the lead has sufficient length for electrical connection. The length of the lead 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 excessive lead length, and make the overall structure of the soft-pack battery cell 10 more compact.

[0255] The battery device 100 according to a second aspect embodiment of the present application is described below with reference to Figures 1-16.

[0256] As shown in Figures 1-16, the battery device 100 according to an embodiment of this application includes a cell assembly, which includes a plurality of pouch battery cells 10 stacked along a first direction. The pouch battery cells 10 are pouch battery cells 10 according to the first aspect embodiment of this application.

[0257] According to the battery device 100 of the present application embodiment, by setting the soft-pack battery cell 10 of the first aspect embodiment above, and 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 large thickness and the wall thickness of the membrane shell 11 is small, thereby giving the soft-pack battery cell 10 a high 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 structure and structural performance, and the two membrane portions 111 have similar or identical size structure and structural performance. The portion 111 can withstand stresses generated within the cavity in a more balanced manner, making the overall structure of the membrane housing 11 more stable and improving its mechanical strength and other structural properties. This allows the membrane housing 11 to effectively meet the support and protection needs of the pouch battery cells 10 when the thickness is large, even with a wall thickness of less than or equal to 0.2 mm. This can reliably improve the energy density of the pouch battery cells 10, thereby reducing the number of supporting and heat-conducting structural components in the battery device 100 and increasing the arrangement space of the pouch battery cells 10 in the battery device 100. As a result, the overall energy density of the battery device 100 is significantly improved.

[0258] In some embodiments of this application, as shown in Figures 7 and 8, the battery device 100 may further include a heat exchange plate 50, which is disposed on at least one side of a plurality of pouch cell 10 in a second direction for heat exchange with the plurality of pouch cell 10, wherein the second direction intersects the first direction.

[0259] In this embodiment, the battery device 100 further 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 plurality of pouch battery cells 10 in the second direction. For example, the heat exchange plate 50 can be arranged on one side of the plurality of pouch battery cells 10 in the second direction, or the heat exchange plate 50 can be arranged on both sides of the plurality of pouch battery cells 10 in the second direction. When the battery device 100 is in operation, the heat generated by the plurality of pouch battery cells 10 in the cell assembly is dissipated through the heat exchange plate 50. When the cell assembly needs to be heated, the heat exchange plate 50 can transfer the heat to the pouch battery cells 10 in the cell assembly.

[0260] In this embodiment, a heat exchange plate 50 is provided, which is arranged on at least one side of multiple 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 easily exchange heat with multiple soft-pack battery cells 10, thereby enabling the cell assembly to obtain a good heat exchange effect, enabling the cell assembly to operate stably and reliably, and thus making the battery device 100 operate more stably.

[0261] In one embodiment of this application, referring to Figures 9 and 10, the surface of the membrane housing 11 facing the heat exchange plate 50 in the second direction can be flat and connected to the heat exchange plate 50 by thermally conductive adhesive or thermally conductive pad.

[0262] The surface of the membrane shell 11 facing the heat exchange plate 50 in the second direction is flat, that is, the surface of the membrane shell 11 facing the heat exchange plate 50 does not have a sealing boss 1101. For example, during the processing and forming of the membrane shell 11, the part where the two membrane parts 111 are connected can form the surface of the membrane shell 11 in the second direction after the two membrane parts 111 are folded. This surface can be formed by directly connecting and fitting the side walls 1112 of the two membrane parts 111, so there is no need to leave a sealing edge 1111. After the membrane shell 11 is folded and formed, the side walls 1112 of the two membrane parts 111 fit together to form the peripheral wall structure of the membrane shell 11 in the second and third directions. The sealing edge 1111 of the two membrane parts 111 seals the receiving cavity and the conductive element 12 in the circumferential direction of the membrane shell 11 by means of hot pressing or the like.

[0263] The surface of the membrane housing 11 facing the heat exchange plate 50 is connected to the heat exchange plate 50 by thermally conductive adhesive or thermally conductive pad. For example, the thermally conductive adhesive can be thermally conductive structural adhesive, and the thermally conductive pad can be a rubber pad, etc. When the battery pack is assembled with the heat exchange plate 50, the thermally conductive adhesive or thermally conductive pad can be pre-applied to the surface of the heat exchange plate 50 that mates with the membrane housing 11. The battery pack can be arranged as a whole on the heat exchange plate 50 and fixedly connected to the heat exchange plate 50 by thermally conductive adhesive or thermally conductive pad.

[0264] In this embodiment, the surface of the membrane housing 11 facing the heat exchange plate 50 is set as a plane, which is simple in structure and can make the membrane housing 11 and the heat exchange plate 50 have a stable mating contact surface. The membrane housing 11 can be stably and reliably fixed to the heat exchange plate 50 by thermally conductive adhesive or thermally conductive pad, 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 cell assembly and the heat exchange plate 50 more reliable.

[0265] In one embodiment of this application, referring to Figures 8 and 10, a sealing boss 1101 may be formed on one side of the membrane shell 11 in the second direction. The battery device 100 may further include an adhesive layer 40, which is bonded between the heat exchange plate 50 and the soft-pack battery cell 10. In the second direction, the height of the adhesive layer 40 is greater than the protrusion height of the sealing boss 1101.

[0266] In this embodiment, a sealing boss 1101 is formed on one side of the membrane housing 11 in the second direction. The adhesive layer 40 provided by the battery device 100 is connected between the heat exchange plate 50 and the soft-pack battery cell 10. For example, the adhesive layer 40 can be an adhesive layer, such as a thermally conductive structural adhesive layer. The height of the adhesive layer 40 in the second direction is greater than the protrusion height of the sealing boss 1101. When the side of the membrane housing 11 with the sealing boss 1101 is fixed to the heat exchange plate 50, since the height of the adhesive layer 40 is greater than the protrusion height of the sealing boss, the sealing boss 1101 on the membrane housing 11 can be arranged in the adhesive layer 40. The outer surface of the sealing boss 1101 and the end face of the membrane housing 11 facing the heat exchange plate 50 are both in contact with and bonded to the adhesive layer 40.

[0267] In this embodiment, the side of the membrane housing 11 with the 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 protrusion height of the sealing boss 1101, so that the adhesive layer 40 can fully cover the gap between the end face of the membrane housing 11 and the heat exchange plate 50, so that the membrane housing 11 can be reliably and stably bonded and fixed to the heat exchange plate 50 through the adhesive layer 40, thereby allowing the battery cell assembly to be stably and reliably assembled and fixed onto the heat exchange plate 50.

[0268] In one embodiment of this application, referring to FIG8, the battery device 100 may further include: an adhesive layer 40, which is bonded between the heat exchange plate 50 and the pouch cell 10, and a portion of the adhesive layer 40 is configured to overflow between two adjacent pouch cells 10 in a first direction to bond the two adjacent pouch cells 10.

[0269] In this embodiment, a portion of the adhesive layer 40 overflows between two adjacent pouch cell 10 in the first direction, bonding the two connected pouch cell 10 together. For example, for one pouch cell 10 in the cell assembly, after the cell assembly is bonded and fixed to the heat exchange plate 50, the side surface of the pouch cell 10 facing the heat exchange plate 50 in the second direction is bonded and fixed to the heat exchange plate 50. The two sides of the pouch cell 10 in the first direction are connected to the adjacent pouch cell 10 through the overflowed adhesive. The two sides of the pouch cell 10 in the first direction are bonded to the heat exchange plate 50 through the overflowed adhesive.

[0270] In this embodiment, a portion of the adhesive layer 40 is configured to overflow between two adjacent pouch cell 10 in the first direction, so that the two adjacent pouch cell 10 can be better connected and fixed at the end facing the heat exchange plate 50, making the overall arrangement of multiple pouch cell 10 in the cell assembly more stable, and greatly increasing the bonding area between the pouch cell 10 and the heat exchange plate 50 through the adhesive layer 40, making the bonding and fixing of the pouch cell 10 and the heat exchange plate 50 more stable, thereby making the cell assembly and the heat exchange plate 50 more secure and stable.

[0271] In some embodiments of this application, referring to FIG15, 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 cell assembly in the second direction. The cell assembly and the base plate are bonded together by the adhesive layer 40. The surface of the pouch cell 10 facing the adhesive layer 40 is the first surface, and the two surfaces of the pouch cell 10 in the first direction are the second surfaces. The first surface and the two second surfaces are connected by a chamfer. The battery device 100 also includes a blocking member 80, which is disposed at the chamfer and is configured to prevent the adhesive layer 40 located at the chamfer from overflowing to the location of the second surface.

[0272] In this embodiment, the battery device 100 is provided with a base plate and an adhesive layer 40. The battery cell assembly is bonded to the base plate through the adhesive layer 40. The base plate can be part of the housing 60 of the battery device 100. The ends of the multiple soft-pack battery cells 10 in the battery cell assembly facing the base plate can be bonded and fixed to the base plate through the adhesive layer 40. The side surface 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 bonded and fixed to the adhesive layer 40. Referring to Figures 2 and 5, the first surface can be the side surface of the two membrane portions 111 of the soft-pack battery cell 10 facing the adhesive layer 40. Specifically, the first surface can be the straight segment 11122 of the side wall 1112 facing the adhesive layer 40. The second surface of the soft-pack battery cell 10 can be the outer surface of the bottom wall 1113 of the membrane portion 111 in the first direction. The chamfer between the first surface and the two second surfaces can be the second arc segment 11123 of the side wall 1112.

[0273] In this embodiment, a blocking member 80 is provided at the chamfer. The blocking member 80 is configured to prevent the adhesive layer 40 at the chamfer from overflowing to the location of the second surface. That is, it prevents the adhesive 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, the two adjacent chamfers of the two adjacent soft-pack battery cells 10 form a certain gap in the first direction. The adhesive of the adhesive layer 40 will overflow into the gap between the two chamfers and bond with the surfaces of the two chamfers, thereby bonding the two adjacent soft-pack battery cells 10 together. When the adhesive continues to overflow towards the second surface in the second direction, the blocking member 80 blocks the overflow of the adhesive.

[0274] 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. This can effectively reduce the probability of the adhesive in the adhesive layer 40 overflowing between the second surfaces of adjacent soft-pack battery cells 10 when the cell assembly and the base plate are bonded and assembled through the adhesive layer 40. This effectively reduces the risk of stress concentration caused by the overflowing adhesive damaging the soft-pack battery cells 10, allowing the soft-pack battery cells 10 to maintain a stable structural state and service life.

[0275] In one embodiment of this application, referring to FIG15, a blocking member 80 may be provided between two adjacent pouch cell 10 in a first direction.

[0276] In this embodiment, a blocking member 80 is provided between two adjacent pouch cell 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, thereby separating the overflowing colloid from the two adjacent first surfaces and the two chamfers. Alternatively, the blocking member 80 can be directly arranged between two adjacent first surfaces and located at the end where the first surface is connected to the chamfer. The blocking member 80 is attached to the two first surfaces to prevent the overflowing colloid from the chamfers from further overflowing between the two adjacent pouch cell 10.

[0277] In this embodiment, a blocking member 80 is provided between two adjacent soft-pack battery cells 10, which makes the arrangement of the blocking member 80 more convenient and reduces the number of blocking members 80 used, thereby reducing the cost of the battery device 100 to a certain extent.

[0278] In one embodiment of this application, the blocking member 80 may be a foam member, and the blocking member 80 is bonded to the base plate.

[0279] In this embodiment, the blocking member 80 is set as a foam part. The foam part is lightweight and has good cushioning performance. It is easy to process and shape. When the foam part is bonded to the base plate and assembled at the chamfer, the foam part can abut against and fit the surface of the soft pack battery cell 10 through a certain deformation. Alternatively, the foam part can fill the gap between adjacent soft pack battery cells 10 as needed.

[0280] In this embodiment, the blocking component 80 is set as a foam component and bonded to the base plate. The structure is simple, and the blocking component 80 can be easily arranged at the chamfer and stably separate the overflowing adhesive of the adhesive layer 40. The assembly is convenient.

[0281] In one embodiment of this application, the blocking member 80 may be an adhesive member, which is bonded to one end of the soft-pack battery cell 10 facing the base plate.

[0282] In this embodiment, the blocking member 80 is an adhesive component. For example, the blocking member 80 can be an adhesive strip. The adhesive component is bonded to the soft-pack battery cell 10. The adhesive component can be set to a single-sided back adhesive. For example, when the battery device 100 is assembled, the adhesive component can be bonded to the corresponding position of the soft-pack battery cell 10 before the cell assembly and the base 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 component are bonded to the adhesive layer 40 as a whole, the adhesive component blocks the adhesive layer 40 at the chamfer.

[0283] In this embodiment, the blocking component 80 is set as an adhesive component, which has a simple structure and can well meet the usage requirements, making it more convenient to assemble and fix the blocking component 80 with the soft-pack battery cell 10.

[0284] In some embodiments of this application, as shown in FIG8, a plurality of pouch cell 10 are stacked along a first direction. The battery device 100 may also include a separator 20. The hardness of the separator 20 is higher than that of the membrane shell 11. There are a plurality of separators 20, which are arranged at intervals in the first direction. At least two pouch cell 10 are arranged between two adjacent separators 20.

[0285] In this embodiment, the battery device 100 further includes a separator 20. There are multiple separators 20 arranged at intervals in the first direction. For example, the number of separators 20 can be two, three, four, five, six, seven, etc. At least two soft-pack battery cells 10 are arranged between two adjacent separators 20. For example, two, three, four, etc. number of soft-pack battery cells 10 can be arranged between two adjacent separators 20.

[0286] In this embodiment, multiple separators 20 are arranged at intervals in the first direction, and a pouch cell 10 is disposed between adjacent separators 20. The hardness of the separators 20 is greater than that of the membrane shell 11. When multiple pouch cells 10 are arranged along the first direction, the separators 20 can provide good support for the multiple pouch cells 10, allowing for convenient and compact arrangement of the multiple pouch cells 10. The separators 20 can also serve a certain separation function, separating the multiple pouch cells 10 in the cell assembly between different separators 20. Thus, when some pouch cells 10 fail, such as when a pouch cell 10 experiences thermal runaway, the separators 20 can separate the thermally runaway pouch cell 10, thereby reducing the impact of thermal runaway on other pouch cells 10 and enabling the cell assembly to operate more stably and reliably.

[0287] The hardness of the separator 20 is greater than that of the membrane shell 11, so that when the separator 20 is assembled with multiple pouch battery cells 10, the separator 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 separator 20, and enables the separator 20 to stably and reliably support and separate the pouch battery cells 10.

[0288] In this embodiment, at least two soft-pack battery cells 10 are arranged between two adjacent separators 20, which can reduce the number of separators 20 arranged in the cell group, thereby reducing the space occupied by the separator 20 structure in the battery device 100, and thus enabling the battery device 100 to maintain a high energy density to a certain extent.

[0289] In this embodiment, multiple separators 20 are arranged at intervals along a first direction. The hardness of the separators 20 is greater than that of the membrane shell 11. At least two soft-pack battery cells 10 are arranged between two adjacent separators 20, so that the multiple soft-pack battery cells 10 in the cell assembly can be stably and reliably supported by the separators 20 in the first direction. This makes the overall structure of the cell assembly more stable and reduces the number of separators 20, allowing the battery device 100 to maintain a high energy density.

[0290] In one embodiment of this application, referring to Figures 8 and 12, the number of pouch cell 10 arranged sequentially between two adjacent separators 20 along the first direction may be less than or equal to four.

[0291] In this embodiment, the number of pouch cells between two adjacent separators 20 is less than or equal to four. For example, four, three, or two pouch cell units 10 can be arranged between two adjacent separators 20.

[0292] In this embodiment, the number of pouch cell 10 between two adjacent separators 20 is set to be less than or equal to four. This makes the arrangement of pouch cell 10 between two adjacent separators 20 more appropriate, so that each pouch cell 10 between the two separators 20 can receive stable and effective support from the two separators 20. This reduces the probability that the number of pouch cell 10 between the two separators 20 is too large and exceeds the support capacity of the separators 20. As a result, multiple separators 20 can provide stable and reliable support for each pouch cell 10 in the cell pack, making the overall structure stability of the cell pack better.

[0293] In one embodiment of this application, referring to Figures 7 and 9, the pouch battery cell 10 extends along a third direction, which is the length direction of the pouch battery cell 10. The separator 20 extends along the length direction of the pouch battery cell 10, and the length of the separator 20 can be greater than 80% of the length of the pouch battery cell 10.

[0294] In this embodiment, the pouch cell 10 extends along a third direction, and the separator 20 extends along the length direction of the pouch cell 10. In other words, the separator 20 extends along the length direction of the pouch cell 10, and the length direction of the separator 20 is the same as the length direction of the pouch cell 10. 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 pouch 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 pouch cell 10.

[0295] In this embodiment, the length of the separator 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 separator 20 can have a larger mating support surface, and the separator 20 can cover most or all of the extension range of the soft-pack battery cell 10 in the third direction, so that the separator 20 can play a good supporting and separating effect on the soft-pack battery cell 10.

[0296] In one embodiment of this application, referring to FIG7, the number of cell groups can be multiple, with at least two cell groups arranged in a third direction. The length of the separator 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 separator 20.

[0297] In this embodiment, the number of cell groups is set to multiple, such as two, three, four, five, six, etc. Multiple 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 10. For example, the length of the separator 20 can be 2.1 times, 2.5 times, 3 times, etc. of the length of the soft-pack battery cell 10. For example, when the length of the separator 20 is greater than twice the length of the soft-pack battery cell 10 but less than three times the length of the soft-pack battery cell 10, one separator 20 can be arranged in two or three cell groups along the third direction. Two adjacent cell groups or three cell groups can share one separator 20.

[0298] In this embodiment, the number of battery cell packs is set to multiple and arranged in a third direction. The structure is simple and the arrangement is reasonable, which can well meet the usage needs of the battery device 100. The length of the separator 20 is set to be more than twice the length of the soft-pack battery cell 10, so that the separator 20 can support at least two adjacent soft-pack battery cells 10 at the same time. This reduces the number of separators 20, makes it easier to position multiple battery cell packs and makes the arrangement more consistent, thereby improving the assembly efficiency of the battery device 100 to a certain extent.

[0299] In one embodiment of this application, referring to FIG12, the thickness of the separator 20 along the first direction may be less than the thickness of the pouch cell 10, and the width of the separator 20 along the second direction is greater than 80% of the width of the pouch cell 10.

[0300] In this embodiment, the width of the separator 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 separator 20 can be 81%, 82%, 84%, 85%, 90%, 100%, 120%, 150%, 170%, 200%, etc. of the width of the soft-pack battery cell 10.

[0301] In this embodiment, the width of the separator 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 separator 20 can form a large supporting and mating area, and the separator 20 can cover most of the surface of the soft-pack battery cell 10 on one side in the first direction, so that the separator 20 can provide good support and separation for the soft-pack battery cell 10.

[0302] In one embodiment of this application, the thickness of the partition 20 along the first direction can be 0.8 mm to 2.0 mm.

[0303] 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.

[0304] In this embodiment, the thickness of the separator 20 is set to be greater than or equal to 0.8 mm, so that the separator 20 can have good structural strength to stably and reliably support the soft-pack battery cell 10. The thickness of the separator 20 is set to be less than or equal to 2 mm, so that the separator 20 has a thinner thickness while meeting the support requirements, thereby reducing the space occupied by the separator 20 in the battery device 100, and thus enabling the battery device 100 to have a higher energy density.

[0305] In one embodiment of this application, the partition 20 may be an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0306] In this embodiment, the partition 20 is made of aluminum plate, aluminum alloy plate, copper plate or steel plate. Aluminum plate and aluminum alloy plate have low density and good thermal conductivity, copper plate has good mechanical strength and thermal conductivity, and steel plate has good mechanical strength and durability, and is economical.

[0307] In this embodiment, the separator 20 is made of aluminum plate, aluminum alloy plate, copper plate or steel plate, so that the separator 20 has good mechanical strength, so that the separator 20 can meet the support requirements well, and the separator 20 has good thermal conductivity, so that the soft pack battery cell 10 in the cell pack can exchange heat through the separator 20, and the cell pack can obtain better heat exchange effect.

[0308] In one embodiment of this application, the partition 20 may be a solid structure.

[0309] In this embodiment, the partition 20 is set as a solid structure, that is, the partition 20 does not have any holes, flow channels or cavities, and the partition 20 is a solid plate structure.

[0310] In this embodiment, the separator 20 is set as a solid structure, so that the separator 20 can have good mechanical strength and support reliability, thereby providing more stable and reliable support for the multiple soft-pack battery cells 10 in the cell pack.

[0311] In one embodiment of this application, the partition 20 may be a heat-conducting element and is thermally connected to the membrane shell 11.

[0312] In this embodiment, the partition 20 is a heat-conducting component and is heat-conductingly connected to the membrane shell 11. For example, the partition 20 can be a plate with heat-conducting properties, such as a copper plate or an aluminum alloy plate. The partition 20 is heat-conductingly connected to the membrane shell 11. For example, the partition 20 and the membrane shell 11 can be heat-conductingly connected by a heat-conducting structural adhesive or by using double-sided tape to connect and fix them and achieve heat transfer.

[0313] In this embodiment, by setting the separator 20 as a heat-conducting element, the separator 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 separator 20. For example, the heat can be conducted out quickly through the separator 20. The separator 20 can also be thermally connected to the heat exchange plate 50, so that the heat can be transferred from the separator 20 to the heat exchange plate 50 and conducted out.

[0314] In this embodiment, the separator 20 is configured as a heat conductor and is thermally connected to the membrane shell 11, so that the separator 20 can play a good heat exchange role for the soft-pack battery cell 10, so that the soft-pack battery cell 10 can exchange heat through the separator 20 in the first direction, thereby enabling the cell assembly to obtain a better heat exchange effect and enabling the battery device 100 to have better thermal management performance.

[0315] In one embodiment of this application, a heat exchange channel may be formed within the partition 20.

[0316] In this embodiment, a heat exchange channel is formed inside the separator 20. When the cell assembly is in operation, the heat exchange fluid can flow in the heat exchange channel inside the separator 20 to perform heat exchange on the soft-pack battery cell 10. At the same time, the heat exchange plate 50 performs heat exchange on one or both sides of the soft-pack battery cell 10 in the second direction.

[0317] In this embodiment, a heat exchange channel is formed within the separator 20, enabling the separator 20 to function as a liquid cooling plate for efficient heat exchange with the pouch cell 10. This significantly improves the heat exchange effect of the separator 20 on the pouch cell 10 in the first direction, resulting in better heat exchange performance for the cell assembly and improved thermal management performance of the battery device 100. Furthermore, the separator 20 integrates liquid cooling heat exchange, reducing the need for additional heat exchange structures. While improving heat exchange performance, this reduces the number of structural components of the non-pouch cell 10 within the battery device 100, allowing for a more compact arrangement of the cell assembly and maintaining a higher energy density.

[0318] In one embodiment of this application, the separator 20 may be bonded to adjacent pouch cell 10.

[0319] In this embodiment, the separator 20 is bonded to the adjacent soft-pack battery cell 10. For example, the separator 20 can be fixed to the adjacent soft-pack battery cell 10 by adhesive.

[0320] In this embodiment, the separator 20 is bonded to the adjacent soft-pack battery cell 10. The structure is simple and 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 cell assembly more compact and stable.

[0321] In one embodiment of this application, the separator 20 can be bonded and fixed to the adjacent pouch cell 10 by double-sided adhesive.

[0322] In this embodiment, the separator 20 is bonded and fixed to the adjacent soft-pack battery cell 10 by double-sided adhesive. When the soft-pack battery cell 10 and the separator 20 are assembled, the double-sided adhesive can be first bonded and fixed to the soft-pack battery cell 10 or the separator 20, and then the soft-pack battery cell 10 is bonded and fixed to the separator 20 by double-sided adhesive.

[0323] In this embodiment, the separator 20 and the adjacent soft-pack battery cell 10 are fixed together by double-sided adhesive, which is simple in structure and easy and reliable to fix.

[0324] In one embodiment of this application, as shown in Figures 8 and 12, in a first direction, at least two adjacent pouch cell 10 may be provided with a buffer 30, the hardness of which is less than that of the membrane shell 11.

[0325] In this embodiment, a buffer 30 is provided between at least two adjacent pouch cell 10. This can mean that in the cell assembly, when no separator 20 is provided between any two adjacent pouch cell 10 in the first direction, a buffer 30 is provided.

[0326] For example, since the separators 20 are arranged at intervals in the first direction, at least two pouch cell 10 are disposed between adjacent separators 20. Separators 20 can also be arranged between two adjacent pouch cell 10. When there is no separator 20 between two adjacent pouch cell 10, a buffer 30 can be arranged. When there is a separator 20 between two adjacent pouch cell 10, a buffer 30 can also be arranged as needed. For example, when two pouch cell 10 are disposed between two separators 20, a buffer 30 can be provided between these two pouch cell 10. No buffer 30 is provided at the location where the separators 20 are disposed. In this case, the buffer 30 and the separators 20 can be arranged at intervals or staggered in the first direction. Optionally, the buffer 30 can be a buffer pad.

[0327] In this embodiment, by setting a buffer 30 between two adjacent pouch cells, and the hardness of the buffer 30 is less than that of the membrane shell 11, the buffer 30 can effectively absorb the deformation of the pouch cell 10 and the vibration under external impact, and can also effectively buffer the direct contact friction of the brackets of adjacent pouch cell 10, so that the overall structure of the cell assembly is more stable, and the battery device 100 can operate more stably and reliably.

[0328] In some examples of this application, referring to Figures 8 and 12, in a first direction, at least two adjacent pouch cell 10 may be provided with a buffer 30 and a separator 20 simultaneously.

[0329] In this embodiment, at least two adjacent soft-pack battery cells 10 are provided with a buffer 30 and a separator 20. For example, the separator 20 can be bonded and fixed to one of the soft-pack battery cells 10 and the buffer 30, and the buffer 30 can abut against and cooperate with another soft-pack battery cell 10.

[0330] In this embodiment, at least two adjacent pouch cell 10 are simultaneously provided with a buffer 30 and a separator 20. The structure is simple and easy to arrange. The separator 20 can work with the buffer 30 to provide good support for the pouch cell 10. The buffer 30 and the separator 20 work together to provide good buffering for two adjacent pouch cell 10 with the separator 20 arranged thereon. This allows any two adjacent pouch cell 10 in the cell assembly to have good buffering effect, making the overall structure of the cell assembly more stable.

[0331] In some examples of this application, referring to Figures 8 and 12, in the first direction, at most one of a buffer 30 and a separator 20 may be provided between any two adjacent pouch cell 10.

[0332] In this embodiment, at most one of the buffer 30 and the separator 20 is provided between any two adjacent soft-pack battery cells 10. That is, a separator 20 can be provided between any two adjacent soft-pack battery cells 10 without a buffer 30, or a buffer 30 can be provided without a separator 20.

[0333] In this embodiment, at most one of a buffer 30 and a separator 20 is provided between any two adjacent pouch cell 10, so that the separator 20 and the buffer 30 arranged in the cell assembly can be arranged alternately or staggered, thereby reducing the assembly difficulty when the separator 20 and the buffer 30 are arranged between the same two pouch cell 10, and making it convenient and easy to assemble the cell assembly with the separator 20 and the buffer 30.

[0334] In some examples of this application, referring to Figures 8 and 12, at least one pouch cell 10 may be sandwiched between the buffer 30 and the separator 20 in a first direction.

[0335] In this embodiment, at least one soft-pack battery cell 10 is sandwiched between the buffer member 30 and the separator 20. That is, one or more soft-pack battery cells 10 can be sandwiched between the buffer member 30 and the separator 20. At least one soft-pack battery cell 10 is supported by the separator 20 and buffered and damped by the buffer member 30.

[0336] In this embodiment, at least one soft-pack battery cell 10 is sandwiched between the buffer member 30 and the separator 20. The structure is simple, and the arrangement of the separator 20 and the buffer member 30 in the cell assembly can be flexibly and conveniently set. The buffer member 30 and the separator 20 can work together to provide good support and buffering for multiple soft-pack battery cells 10, thereby making the battery device 100 easier to assemble and enabling the battery device 100 to operate stably.

[0337] In one example of this application, referring to Figures 8 and 12, in the first direction, one of the buffer 30 and the separator 20 may be provided between any two adjacent pouch cell 10, and the buffer 30 and the separator 20 in the cell assembly are alternately arranged along the first direction.

[0338] In this embodiment, one of the buffer member 30 and the separator 20 can be provided between any two adjacent pouch battery cells 10. The buffer member 30 and the separator 20 are arranged alternately along the first direction. For example, in the first direction, the arrangement position is set between two adjacent pouch battery cells 10. The multiple pouch battery cells 10 in the cell group constitute multiple arrangement positions arranged along the first direction. The multiple arrangement positions can be arranged with the separator 20 and the buffer member 30 arranged alternately along the first direction. Two adjacent pouch battery cells 10 with the separator 20 are bonded and fixed by the separator 20. Two adjacent pouch battery cells 10 with the buffer member 30 are abutted and cooperated by the buffer member 30.

[0339] In this embodiment, a buffer 30 or a separator 20 is arranged between two adjacent pouch cell 10 in the cell assembly. The buffer 30 and the separator 20 are arranged alternately in the first direction. The structure is simple and makes the arrangement of the separator 20 and the buffer 30 in the cell assembly more balanced. This allows each pouch cell 10 in the cell assembly to receive stable and reliable support and buffering, thereby improving the overall structural stability of the cell assembly and making the battery device 100 operate more stably and have better thermal management performance.

[0340] In some examples of this application, the buffer 30 can cover more than 80% of the thickness-side surface area of ​​the pouch cell 10.

[0341] 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% of the surface area of ​​the thickness side of the soft-pack battery cell 10, etc.

[0342] In this embodiment, the buffer 30 is configured 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 30 can form a large buffer mating area, and the buffer 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 30 can play a stable and effective buffering role for the soft-pack battery cell 10.

[0343] In some embodiments of this application, referring to Figures 13 and 14, each of the pouch cell 10 has a conductive element 12 at both ends in a third direction. The conductive element 12 is electrically connected to the electrode assembly and is at least partially exposed outside the membrane housing 11. The conductive elements 12 on the same side of two adjacent pouch cells 10 in the cell assembly are connected.

[0344] In this embodiment, the conductive elements 12 on the same side of two adjacent pouch battery cells 10 in the cell assembly are connected. For example, when the positive electrodes of multiple pouch battery cells 10 are arranged on the same side in a third direction, two adjacent pouch battery cells 10 can be connected in parallel through the conductive elements 12 on the same side. When the positive and negative electrodes of multiple pouch battery cells 10 are arranged alternately on the same side, two adjacent pouch battery cells 10 can be connected in parallel through the conductive elements 12 on the same side. Alternatively, the arrangement of the positive and negative electrodes on the same side of multiple pouch batteries can be made more flexible and complex as needed, and multiple pouch battery cells 10 can be connected in series and parallel through the conductive elements 12 on the same side.

[0345] In this embodiment, by connecting the conductive parts 12 on the same side of two adjacent pouch battery cells 10, it is possible to meet the different electrical connection methods of multiple pouch battery cells 10 in the cell group, making the electrical connection of multiple pouch battery cells 10 more convenient and easier.

[0346] In one embodiment of this application, referring to Figures 13 and 14, the cell assembly may include at least three pouch cell 10, and the pouch cell 10 located between two adjacent pouch cell 10 in the cell assembly is the intermediate cell. Of the two conductive elements 12 at both ends of the intermediate cell, one conductive element 12 is connected to the conductive element 12 on the same side of an adjacent pouch cell 10 of the intermediate cell, and the other conductive element 12 is connected to the conductive element 12 on the same side of another adjacent pouch cell 10 of the intermediate cell.

[0347] In this embodiment, the cell assembly includes at least three pouch cell 10s. For example, when the cell assembly has three pouch cell 10s, in the first direction, the middle pouch cell 10 is referred to as the middle cell, and the other two pouch cell 10s can be referred to as adjacent cells. When the cell assembly has four pouch cell 10s, the middle pouch cell 10 among the three adjacent pouch cell 10s is referred to as the middle cell, and the two pouch cell 10s adjacent to it can be referred to as adjacent cells. On the same side in the third direction, the conductive element 12 of the middle cell is connected to the conductive element 12 of one of the adjacent cells, and the other conductive element 12 of the middle cell is connected to the conductive element 12 of the other adjacent cell. Thus, the conductive element 12 can form an electrical connection between the two electrodes of the multiple pouch cell 10s in the third direction.

[0348] In this embodiment, when the positive and negative electrodes of the pouch battery cell 10 are arranged on the same side of a third direction, two adjacent pouch battery cells 10 can form a shared electrode through the connection of the conductive element 12. For example, after the positive electrodes of two pouch battery cells 10 arranged on the same side are connected through the conductive element 12, the external circuit of the two conductive elements 12 can be connected to the conductive element 12 to form a circuit connection with the two pouch battery cells 10. When the positive and negative electrodes of the pouch battery cells 10 are alternately arranged on both sides of a third direction along the first direction, multiple pouch battery cells 10 can form a series electrical connection, and the battery cell assembly can be electrically connected to the external circuit as a whole through the two conductive elements 12.

[0349] In this embodiment, one conductive element 12 of the intermediate cell is connected to the same-side conductive element 12 of an adjacent soft-pack battery cell 10, and the other conductive element 12 of the intermediate cell is connected to the same-side conductive element 12 of another adjacent soft-pack battery cell 10. The structure is simple and the connection relationship is clear and straightforward. This allows each conductive element 12 to be connected individually, thereby reducing the probability of problems such as confusing connection relationships and the need to add adapters when connecting multiple soft-pack batteries. This makes it easy and convenient to connect multiple soft-pack battery cells 10, making the cell assembly more efficient and convenient.

[0350] In one embodiment of this application, referring to FIG14, two conductive elements 12 constituting a connection can be connected by overlapping, and at least one conductive element 12 is in a bent shape.

[0351] In this embodiment, the two conductive elements 12 that constitute the connection are connected by overlapping. That is, the two conductive elements 12 have a certain overlapping area. At least one conductive element 12 is in a curved shape. For example, one conductive element 12 can extend straight along a third direction, and the other conductive element 12 can be bent toward the conductive element 12 in a first direction to overlap with the conductive element 12. Alternatively, both conductive elements 12 are in a curved shape. For example, the two conductive elements 12 can be bent toward each other in the first direction and overlap.

[0352] In this embodiment, the two conductive elements 12 that form the connection are connected by overlapping, which can give the two conductive elements 12 a larger connection area, thereby making the connection and fixation of the two conductive elements 12 more stable and reliable. At least one conductive element 12 is in a bent shape, which makes it easier and more convenient to connect the two conductive elements 12.

[0353] In one embodiment of this application, referring to FIG14, the two conductive elements 12 constituting the connection can be connected by an adapter piece 70, which is in a bent shape.

[0354] In this embodiment, two conductive elements 12 are connected by an adapter piece 70. The adapter piece 70 is curved. Exemplarily, both conductive elements 12 that form the connection can extend in a straight line along a third direction. The adapter piece 70 overlaps and connects with the conductive elements 12 at both ends in the first direction through its own curved shape.

[0355] In this embodiment, the two conductive components 12 that form the connection are connected by an adapter piece 70, which can reduce the processing steps and procedures of the conductive components 12 when connecting the soft-pack battery cells 10. The connection process can be carried out quickly and efficiently by using the standardized production adapter piece 70, which makes it more convenient and efficient to connect multiple soft-pack battery cells 10, and makes the production efficiency of the cell pack higher.

[0356] In one embodiment of this application, referring to FIG14, the connection can be in a curved shape, and the curved shape is U-shaped.

[0357] In this embodiment, the connection is in a curved shape, which means that the position where the two conductive parts 12 are connected is in a curved shape. The conductive parts 12 can be bent at the end during processing. When the two connected conductive parts 12 are connected, the bent parts can be connected to form a curved shape at the connection.

[0358] In this embodiment, the connection between the two connected conductive parts 12 is formed into a curved shape, and the curved shape is U-shaped. The structure is simple and easy to process and form. It also greatly reduces the stress concentration at the connection between the two connecting parts, making the connection between the two connecting parts more stable and reliable.

[0359] In one embodiment of this application, the two tabs extending from both ends of the pouch cell 10 have opposite polarities, and the two conductive members 12 connected together have the same or opposite polarities.

[0360] In this embodiment, the two tabs extending from both ends of the pouch battery cell 10 have opposite polarities, and the two conductive parts 12 connected together have the same or opposite polarities. For example, the two conductive parts 12 connected together can be connected to the positive tab and the negative tab of the two pouch battery cells 10 respectively, or the two conductive parts 12 connected together can be connected to the two positive tabs or the two negative tabs of the two cells respectively.

[0361] In this embodiment, the two tabs extending from both ends of the soft-pack battery cell 10 have opposite polarities to meet the usage requirements of the soft-pack battery cell 10. The two conductive parts 12 connected by overlapping have the same or opposite polarities, which allows multiple soft-pack battery cells 10 to be flexibly connected and assembled as needed.

[0362] In one embodiment of this application, referring to Figures 11 and 12, there can be multiple cell groups, with at least two cell groups arranged in a third direction, wherein the conductive elements 12 of two adjacent pouch cell 10s along the third direction are directly connected.

[0363] In this embodiment, multiple cell groups are arranged in a third direction. The conductive parts 12 of two adjacent pouch cell 10s in the third direction are directly connected. For example, if two cell groups are arranged in a third direction, the pouch cell 10s in the two cell groups are arranged adjacent to each other in the third direction. Taking two adjacent pouch cell 10s in the two cell groups as an example, the conductive part 12 of one pouch cell 10 facing the other pouch cell 10 and the conductive part 12 of the other pouch cell 10 facing the first pouch cell 10 are located on the same side of any pouch cell 10 in the third direction. The two conductive parts 12 of the two pouch cell 10 located on the same side in the third direction can extend in a straight line along the third direction and be directly connected.

[0364] In this embodiment, the conductive parts 12 of two adjacent soft-pack battery cells 10 along a third direction are directly connected. The structure is simple and the connection is convenient and easy. It can meet the arrangement requirements of the separator 20 and can greatly reduce the number of steps and processes or the number of adapters used for connection when bending the conductive parts 12 of two adjacent soft-pack battery cells 10 during production, so as to make the production efficiency of the battery cell assembly higher.

[0365] In some embodiments of this application, the pouch cell 10 is any one of a lithium iron phosphate cell, a ternary cell, and a solid-state cell.

[0366] In this embodiment, the soft-pack battery cell 10 can be any one of a lithium iron phosphate battery cell, a ternary battery cell, or a solid-state battery cell. Lithium iron phosphate battery cells have advantages such as high reliability, long cycle life, and good high-temperature performance. Ternary battery cells have advantages such as high energy density and fast charging. Solid-state battery cells have advantages such as high reliability, high energy density, and long cycle life. For example, solid-state battery cells can be sulfide solid-state batteries, oxide solid-state batteries, polymer solid-state batteries, composite solid-state electrolyte batteries, garnet solid-state batteries, etc.

[0367] In this embodiment, the soft-pack battery cell 10 is set to any one of lithium iron phosphate battery cell, ternary battery cell, and 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 and enabling the battery device 100 to better meet different usage needs.

[0368] In some embodiments of this application, the pouch battery cell 10 is a lithium iron phosphate battery cell, and the ratio of the amount of positive active material, binder, and conductive agent in the positive electrode material of the pouch battery cell 10 is 96:1-3:1-3; the pouch battery cell 10 is a ternary battery cell, and the ratio of the amount of positive active material, binder, and conductive agent in the positive electrode material of the pouch battery cell 10 is 96:2-3:1-2.

[0369] It should be noted that the positive electrode of the soft-pack battery cell 10 can be a positive electrode sheet, which can include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector. The positive electrode film layer includes a positive electrode active material.

[0370] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0371] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For instance, the metal foil can be made of stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, silver-surfaced aluminum, or stainless steel. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0372] As an example, when the pouch cell 10 of this application embodiment is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide, and their respective modified compounds; optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improving the energy density of the pouch cell 10. However, this application is not limited to these materials, and other conventional materials that can be used as the positive electrode film layer of the battery may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0373] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0374] Layered transition metal oxides include at least one compound of the general formula LiaNibCocMdOeAf and its modified compounds. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, and B, and A includes at least one of N, F, S, and Cl. Optionally, 0.5≤b<1, and further optionally, 0.75≤b≤0.98.

[0375] Examples of layered transition metal oxides include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), and LiNi0.5 At least one of the following: Co0.25Mn0.25O2 (also known as NCM211), LiNi0.6Co0.2Mn0.2O2 (also known as NCM622), LiNi0.8Co0.1Mn0.1O2 (also known as NCM811), LiNi0.9Co0.05Mn0.05O2 (also known as Ni90), lithium nickel cobalt aluminum oxides (such as LiNi0.80Co0.15Al0.05O2) and their modified compounds.

[0376] In the embodiments of this application, the modified compounds of the above-mentioned positive electrode active materials can be doped and / or surface coated to modify the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0377] During the charging and discharging process, the soft-pack battery cell 10 undergoes the insertion and extraction of active ions such as Li, resulting in a different molar content of Li in the soft-pack battery cell 10 at different discharge states. In the examples of positive electrode active materials in this application, the molar content of Li refers to the initial state of the material, i.e., the state before feeding. When the positive electrode active material is applied to the battery system, the molar content of Li may change after charge-discharge cycles.

[0378] In the examples of positive electrode active materials in this application, the molar content of oxygen (O) is only a theoretical value. Oxygen release from the crystal lattice will cause the molar content of oxygen (O) to change. In reality, the molar content of oxygen (O) will fluctuate.

[0379] In this embodiment, the elemental content in the positive electrode active material is defined in a way known in the art and can be detected using equipment and methods known in the art. For example, referring to EPA 6010D-2014, it can be measured by inductively coupled plasma atomic emission spectrometry (ICP-OES, instrument model: Thermo ICAP7400). First, 0.4g of the positive electrode active material is weighed and 10ml (50% concentration) of aqua regia is added. Then, it is placed on a plate at 180℃ for 30min. After digestion on the plate, the volume is adjusted to 100mL, and quantitative testing is performed using the standard curve method.

[0380] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, a positive electrode film layer may or may not be provided on the surface of the foamed metal. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0381] In some embodiments, the positive electrode film layer may optionally include a positive electrode conductive agent. This application embodiment does not particularly limit the type of positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one selected from superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5 wt%.

[0382] In some embodiments, the positive electrode film layer may optionally include a positive electrode binder. This application embodiment does not impose any particular limitation on the type of positive electrode binder. As an example, the positive electrode binder may include at least one selected from polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), PVDF-tetrafluoroethylene-propylene terpolymer, PVDF-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resins. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5 wt%.

[0383] The positive electrode film is typically formed by coating a positive electrode slurry onto a positive electrode current collector, followed by drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder, and any other components in a solvent and stirring until homogeneous. The solvent can be N-methylpyrrolidone (NMP), but is not limited to it.

[0384] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer including a negative electrode active material.

[0385] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0386] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0387] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in a pouch cell 10. As an example, the negative electrode active material may include at least one of the following materials: carbon materials (e.g., carbon materials include at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode films in batteries may also be used. These negative electrode films may be used alone or in combination of two or more.

[0388] In some embodiments, the negative electrode active material includes silicon, which may exist in the form of a silicon-based material, such as elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The introduction of silicon can improve the energy density of the pouch cell 10.

[0389] In some embodiments, the mass content of silicon in the negative electrode film layer is from 1 wt% to 32 wt%, optionally from 2 wt% to 19 wt%, and further optionally from 6 wt% to 13 wt%. In the pouch cell 10 system, when the mass content of silicon is within the above range, the energy density of the pouch cell 10 can be improved.

[0390] In the embodiments of this application, the mass content of silicon in the negative electrode film layer has a meaning known in the art and can be detected using equipment and methods known in the art. For example, the negative electrode sheet can be immersed in a solvent such as water to separate the negative electrode active material from the negative electrode current collector, and the negative electrode active material can be obtained by filtration. The silicon content of the negative electrode active material can be obtained by using an ICAP7400 inductively coupled plasma atomic emission spectrometer from Thermo Fisher Scientific, USA, in accordance with the GB / T30902-2014 standard.

[0391] In some embodiments, the negative electrode film layer may optionally include a negative electrode conductive agent. This application embodiment does not particularly limit the type of negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one selected from superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5 wt%.

[0392] In some embodiments, the negative electrode film layer may optionally include a negative electrode binder. This application embodiment does not impose any particular limitation on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, waterborne acrylic resins (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0393] In some embodiments, the negative electrode film may optionally include other additives. As an example, other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of other additives in the negative electrode film is ≤2 wt%.

[0394] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0395] In some embodiments, the separator includes a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0396] This application does not impose any particular restrictions on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0397] In some embodiments, the material of the separator may include one or more of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0398] In some embodiments, the separator may include a porous base membrane and a coating disposed on at least one side of the porous base membrane, the coating including at least one of inorganic particles or organic particles.

[0399] Porous base membranes may include one or more of polyethylene and polypropylene.

[0400] Inorganic particles possess good heat resistance, which can improve the overall heat resistance of the separator. Within the operating voltage range of sodium-ion batteries, inorganic particles essentially do not undergo oxidation and reduction reactions with metal dendrites. In other words, inorganic particles are configured to prevent oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of sodium-ion batteries.

[0401] 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.

[0402] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyarylamide, polyamide-imide, polyimide, copolymers of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0403] In some embodiments, the pouch cell 10 further includes an electrolyte.

[0404] During the charging and discharging process of a single battery cell, active ions repeatedly insert and extract between the positive and negative electrode plates, while the electrolyte acts as a conductor for these active ions. This application does not impose any particular restrictions on the type of electrolyte; it can be selected according to actual needs.

[0405] Electrolytes consist of electrolyte salts and solvents. The types of electrolyte salts and solvents are not specifically limited and can be selected according to actual needs.

[0406] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery performance, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and additives that improve battery low-temperature power performance.

[0407] For example, the additives include at least one of the following: cyclic carbonate compounds containing unsaturated bonds, sulfate compounds, sulfite compounds, sulfonyl lactone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds, isocyanate compounds, phosphonitrile compounds, acid anhydrides, cyclic acid anhydride compounds, phosphite compounds, phosphate compounds, borate esters, and carboxylic acid esters.

[0408] In this embodiment, when the pouch cell 10 is configured as a lithium iron phosphate battery cell, the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch cell 10 is 96:1-3:1-3. For example, the ratio 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. Optionally, the positive electrode active material is lithium iron phosphate, the binder is polyvinylidene fluoride, and the conductive agent is conductive graphite, and the ratio of the positive electrode active material, binder, and conductive agent can be 96:2:2.

[0409] In this embodiment, when the pouch cell 10 is configured as a ternary lithium battery cell, the ratio of the positive electrode active material, binder, and conductive agent in the positive electrode material of the pouch cell 10 is 96:2-3:1-2. For example, the ratio 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. Optionally, the ternary lithium battery cell can be an octet lithium nickel chromium manganese oxide LiNi0.8Co0.1Mn0.1O2, wherein the ratio of the positive electrode active material, binder, and conductive agent can be 96:2.5:1.5.

[0410] In this embodiment, the pouch battery cell 10 is set as a lithium iron phosphate battery cell, and the ratio of the active material, binder, and conductive agent is 96:1-3:1-3. Alternatively, the pouch battery cell 10 is set as a ternary battery cell, and the ratio of the active material, binder, and conductive agent in the positive electrode material of the pouch battery cell 10 is 96:2-3:1-2. This allows the pouch battery cell 10 to have a higher energy density, better electrode structure stability and reliability, significantly reduces the probability of active material shedding or delamination during charging and discharging, gives the pouch battery cell 10 a longer cycle life, and reduces the internal resistance of the electrode, resulting in better charging and discharging efficiency and power density.

[0411] In one embodiment of this application, the pouch battery cell 10 is a ternary lithium battery cell, and the battery device 100 also includes a housing, in which a plurality of pouch battery cells 10 are housed. In a second direction, the housing is provided with a pressure relief area.

[0412] In this embodiment, the pouch battery cell 10 is configured as a ternary lithium battery cell, and the cell assembly is provided with a casing. The casing houses multiple pouch battery cells 10. The casing has a pressure relief area on the side facing the pouch battery cell 10 in the second direction. For example, the pouch battery cell 10 may have a pressure relief structure on the side facing the casing in the second direction. The pressure relief structure may be opposite to the pressure relief area. When the pouch battery cell 10 experiences thermal runaway, high-temperature gas can be released from the pressure relief area of ​​the casing by breaking through the casing.

[0413] The pressure relief area can be a pressure relief hole, pressure relief groove, or weak point, etc. The shell material can be metal or non-metal. Metal materials can include, but are not limited to, aluminum alloy, stainless steel, or iron, etc., while non-metal materials can include, but are not limited to, plastic, composite materials, etc. For example, the shell can accommodate a portion of multiple pouch battery cells 10 in the cell assembly. For instance, a single shell can accommodate two, three, or four adjacent pouch battery cells 10, and the cell assembly can accommodate all the pouch battery cells 10 by arranging multiple shells along a first direction.

[0414] In this embodiment, the battery pack is provided with a casing. The casing can provide mechanical protection to the outside of multiple pouch battery cells 10, reduce the risk of damage to the pouch battery cells 10 due to external mechanical impact, and better fix the position of multiple pouch battery cells 10, reducing the probability of displacement of the pouch battery cells 10 inside the housing 60, which helps to improve the installation reliability of the pouch battery cells 10 inside the housing 60.

[0415] In this embodiment, the outer casing is provided with a pressure relief zone in the second direction, so that the soft-pack battery cell 10 in the battery pack can be stably and reliably depressurized in the direction when thermal runaway occurs, thereby greatly reducing the risk of battery pack explosion and making the battery pack operation more stable and reliable.

[0416] In one embodiment of this application, referring to the figures, the outer 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 being connected to the two ends of the first shell wall located in a first direction, and a first opening being formed between the second shell wall and the third shell wall.

[0417] By configuring the outer casing to include a first shell wall, a second shell wall, and a third shell wall, the overall casing can be U-shaped. This shape design allows the pouch battery cell 10 to be easily inserted or removed from the first opening. During the assembly of the battery device 100, the assembler can slide the pouch battery cell 10 into the U-shaped casing through the first opening. Compared to a completely enclosed casing structure, this method is simpler and faster. Furthermore, when maintenance, repair, or replacement of the pouch battery cell 10 is required, it is easier to remove it from the casing. For example, on the production line of the battery device 100, this casing structure can improve installation efficiency and reduce assembly costs.

[0418] The aforementioned outer casing can better conform to the shape of the pouch battery cell 10. The pouch battery cell 10 is typically flat, and the U-shaped casing tightly surrounds most of its surface. The first and second shell walls can replace the partitions 20 as needed for support. While ensuring good protection for the pouch battery cell 10, it also effectively utilizes the internal space of the housing 60, which is crucial for improving the energy density of the battery device 100. For example, when designing a more compact battery device 100, the U-shaped casing allows for a more rational arrangement of the pouch battery cells 10, enabling more pouch battery cells 10 to be packed into the limited housing 60, thereby increasing the total capacity of the battery device 100.

[0419] In the above technical solution, by setting the outer casing to the above structure, it is convenient to assemble the battery cell assembly, which is conducive to improving assembly efficiency, reducing costs, and also conducive to later maintenance and reducing usage costs. Moreover, it can better bind multiple soft-pack battery cells 10 while reducing the space occupied inside the casing 60, which is conducive to improving the compactness of the internal spatial layout of the battery device 100, thereby increasing the energy density of the battery device 100.

[0420] In some embodiments of this application, referring to FIG6, the battery device 100 may further include a housing 60 having a mounting cavity in which the battery cells are disposed.

[0421] In this embodiment, the battery device 100 includes a housing 60. Exemplarily, the housing 60 may include a first housing and a second housing, which are fastened together to form a closed space inside the housing 60 to house the battery cell assembly. Here, "closed" refers to covering or shutting off, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0422] As an example, the housing 60 may include a top cover, a frame, and a bottom plate, with the top cover and bottom plate respectively connected to the frame, thereby forming an enclosed space inside the housing 60 to house the battery cell assembly. In some embodiments, the housing 60 may be part of the chassis structure of a vehicle. For example, a portion of the housing 60 may be at least a portion of the vehicle's floor, or a portion of the housing 60 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0423] Other configurations and operations of the battery device 100 in this embodiment are known to those skilled in the art and will not be described in detail here.

[0424] The energy storage device according to an embodiment of the third aspect of this application is described below with reference to Figures 1-16.

[0425] As shown in Figures 1-16, the energy storage device according to an embodiment of this application includes: a power conversion device and a battery device 100 according to a second aspect embodiment of this application, wherein the battery device 100 is used to store or provide electrical energy.

[0426] Other configurations and operations of the energy storage device according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0427] According to the energy storage device of the embodiments of this application, by setting the battery device 100 of the second aspect embodiment above, 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 large thickness and the wall thickness of the membrane shell 11 is small, thereby giving the soft-pack battery cell 10 a high 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 the same size structure and structural performance, and the two membrane portions 111 have similar or the same size structure and structural performance. The membrane housing 11 can withstand stresses generated within the cavity in a more balanced manner, making the overall structure of the membrane housing 11 more stable and improving its mechanical strength and other structural properties. This allows the membrane housing 11 to effectively meet the support and protection needs of the pouch battery cells 10 when the thickness is large, even with a wall thickness of less than or equal to 0.2 mm. This can reliably improve the energy density of the pouch battery cells 10, thereby reducing the number of supporting and heat-conducting structural components in the battery device 100 and increasing the arrangement space of the pouch battery cells 10 in the battery device 100. As a result, the overall energy density of the battery device 100 is greatly improved.

[0428] The electrical device 1000 according to an embodiment of the fourth aspect of this application is described below with reference to Figures 1-16.

[0429] As shown in Figures 1-16, the power-consuming device 1000 according to the embodiments of this application includes a battery device 100 according to the second aspect of this application or an energy storage device according to the third aspect of this application. The battery device 100 is used to store or provide electrical energy.

[0430] Other configurations and operations of the electrical device 1000 according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0431] According to the embodiment of the present application, the power device 1000, by setting the battery device 100 of the second aspect embodiment or the energy storage device of the third aspect embodiment, and 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, makes the soft-pack battery cell 10 have a large thickness and the wall thickness of the membrane shell 11 small, thereby making the soft-pack battery cell 10 have a high 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 the same size structure and structure. This allows the two membrane sections 111 to have a more balanced ability to withstand stresses generated within the cavity, making the overall structure of the membrane shell 11 more stable and improving its mechanical strength and other structural properties. As a result, the membrane shell 11 can well meet the support and protection needs of the pouch battery cell 10 when the thickness is large, even with a wall thickness of less than or equal to 0.2 mm. This can reliably improve the energy density of the pouch battery cell 10, thereby reducing the number of supporting and heat-conducting structural components in the battery device 100, increasing the arrangement space of the pouch battery cell 10 in the battery device 100, and thus greatly improving the overall energy density of the battery device 100.

[0432] An electrical device 1000 according to a specific embodiment of this application will now be described with reference to Figures 1-16.

[0433] As shown in Figures 1-16, in this embodiment, the electrical device 1000 includes a motor 200, a controller 300, and a battery device 100. The controller 300 is used to control the battery device 100 to supply power to the motor 200.

[0434] The battery assembly 100 includes a housing 60, a cell pack, a separator 20, a buffer 30, and a heat exchange plate 50. The housing 60 has a mounting cavity, and the heat exchange plate 50 can be arranged in the mounting cavity and is located at the bottom of the mounting cavity in a second direction. There are two cell packs, which are arranged in the mounting cavity and arranged in a third direction. The cell packs are bonded and fixed to the first water-cooled base plate with thermally conductive adhesive.

[0435] The cell assembly includes multiple pouch cell 10s arranged along a first direction. The number of pouch cell 10s in the two cell assemblies is the same and they are arranged along a third direction. In the first direction, a separator 20 is provided at both ends of the cell assembly. The separator 20 is arranged within the arrangement range of the two cell assemblies along the third direction. One separator 20 is arranged every two pouch cell 10 in the first direction. A buffer 30 is arranged between two pouch cell 10s located between two adjacent separators 20. The buffer 30 abuts against the two pouch cell 10s. The separator 20 is bonded and fixed to the adjacent pouch cell 10.

[0436] The pouch cell 10 includes a housing 11, an electrode assembly, and conductive elements 12. The housing 11 includes two membrane sections 111. The two membrane sections 111 are folded together and hot-pressed to form a housing structure. The membrane section 111 has a receiving groove. The membrane section 111 includes a sealing edge 1111, a side wall 1112, and a bottom wall 1113 connected sequentially along a first direction. The sealing edges 1111 of the two membrane sections 111 are formed into one piece by hot pressing. The sealing edge 1111 on one side of the housing 11 in a second direction is folded to form a sealing edge protrusion 1101. The electrode assembly is arranged in the receiving cavity. The positive and negative electrodes of the electrode assembly are respectively connected to the two conductive elements 12. The two conductive elements 12 are respectively arranged on both sides of the pouch cell 10 in a third direction. The conductive elements 12 extend out of the housing 11 in a third direction from the receiving cavity. The extended part forms a lead-out part, which is sheet-shaped.

[0437] In another embodiment of the pouch cell 10 of this application, the battery device 100 may further include a housing, which is a U-shaped housing. The housing includes a first housing wall, a second housing wall, and a third housing wall. The first housing wall is located on the side of the cell assembly facing away from the heat exchange plate 50 in the second direction. The second housing wall and the third housing wall are respectively connected to the two ends of the first housing wall in the first direction and arranged between adjacent pouch cell 10s. The second housing wall and the third housing wall can replace part of the separator 20. The multiple housings work together to strengthen and support the cell assembly, making the overall structure of the cell assembly more stable and compact, and facilitating the assembly of the cell assembly. This is beneficial to improving assembly efficiency and reducing costs.

[0438] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A pouch battery cell, wherein, include: A membrane shell (11) has a wall thickness of less than or equal to 0.2 mm. The membrane shell (11) includes two membrane portions (111) connected in a first direction. Each of the two membrane portions (111) defines a receiving groove. The receiving grooves of the two membrane portions (111) are arranged facing each other in the first direction and together form the receiving cavity of the membrane shell (11). Electrode assembly, wherein the electrode assembly is disposed within the receiving cavity. Wherein, the size of the soft-pack battery cell in the first direction is the first size, and the size of any of the film portions (111) in the first direction is the 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. The soft-pack battery cell of claim 1, wherein, The ratio of the second dimension to the first dimension is greater than or equal to 0.45 and less than or equal to 0.

55. The soft-pack battery cell of claim 2, wherein, The ratio of the second dimension to the first dimension is 0.

5. The soft-pack battery cell of any one of claims 1-3, wherein, The first dimension is greater than or equal to 15mm and less than or equal to 45mm. The soft-pack battery cell of any one of claims 1-4, wherein, The second dimension is greater than or equal to 3 mm and less than or equal to 35 mm. The soft-pack battery cell of claim 5, wherein, The second dimension is greater than or equal to 7 mm and less than or equal to 22 mm. The soft-pack battery cell of any one of claims 1-6, wherein, The membrane portion (111) includes: a sealing edge (1111), a side wall (1112), and a bottom wall (1113). The sealing edge (1111) and the bottom wall (1113) are spaced apart 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 periphery of the bottom wall (1113), and the other end extends along the first direction to connect with the sealing edge (1111). The sealing edge (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. At least a portion of the electrode assembly is disposed in the receiving groove. The soft-pack battery cell of claim 7, wherein, The sidewall (1112) includes a first arc segment (11121), a straight segment (11122), and a second arc segment (11123) connected sequentially along the first direction. The straight segment (11122) extends along a straight line in the first direction. The straight segment (11122) is connected to the edge sealing (1111) by an arc through the first arc segment (11121). The straight segment (11122) is connected to the bottom wall (1113) by an arc through the second arc segment (11123). The soft-pack battery cell of claim 8, wherein, The dimension of the straight line segment (11122) in the first direction is a third dimension, and the 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. The soft-pack battery cell of claim 9, wherein, The ratio of the third dimension to the second dimension is greater than or equal to 0.7 and less than or equal to 0.

85. The soft-pack battery cell of any one of claims 8-10, wherein, The dimension of the straight line segment (11122) in the first direction is a third dimension, which is greater than or equal to 5 mm and less than or equal to 30 mm. The soft-pack battery cell of claim 11, wherein, The third dimension is greater than or equal to 7 mm and less than or equal to 18 mm. The soft-pack battery cell of any one of claims 8-12, wherein, 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. The soft-pack battery cell of any one of claims 1-13, wherein, The width of the pouch cell in the second direction is less than or equal to 200 mm, and / or the length of the pouch cell in the third direction is less than or equal to 650 mm, wherein the third direction intersects the second direction and the first direction in pairs. The soft-pack battery cell of any one of claims 1-6, wherein, The membrane shell (11) has a sealing boss (1101) formed on the end face of at least one end in the second direction. The sealing boss (1101) is configured to be formed by folding the sealing edges (1111) of the two membrane portions (111). The second direction intersects the first direction. The soft-pack battery cell of claim 15, wherein, The protrusion height of the edge sealing boss (1101) in the second direction is less than or equal to 0.5 mm. The soft-pack battery cell according to any one of claims 1-16, wherein, The pouch cell has conductive elements (12) at both ends in a third direction. The conductive elements (12) are electrically connected to the electrode assembly and are at least partially exposed outside the membrane shell (11). The third direction intersects with the first direction. According to claim 17, the soft-pack battery cell, wherein, The portion of the conductive element (12) exposed outside the membrane shell (11) is a lead-out portion, which is formed in the shape of a sheet. According to claim 18, the soft-pack battery cell, wherein, The lead-out portion has rounded corners on both sides of the lead-out portion in the second direction and on the end of the lead-out portion in the third direction away from the electrode assembly. The soft-pack battery cell according to any one of claims 17-19, wherein, The portion of the conductive element (12) exposed outside the membrane shell (11) is a lead-out portion, which is a flexible structure. The soft-pack battery cell according to any one of claims 17-20, wherein, The portion of the conductive element (12) exposed outside the membrane shell (11) is the lead-out portion, and the thickness of the lead-out portion is 0.1 mm to 0.5 mm. The soft-pack battery cell according to any one of claims 17-21, wherein, The portion of the conductive element (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 20mm to 60mm. The soft-pack battery cell according to any one of claims 17-22, wherein, The portion of the conductive element (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 10mm to 50mm. A battery device, wherein, The battery pack includes a battery cell assembly comprising a plurality of pouch cell units stacked along the first direction, wherein the pouch cell unit is a pouch cell unit according to any one of claims 1-23. The battery device according to claim 24, wherein, Also includes: A heat exchange plate (50) is disposed on at least one side of the plurality of pouch cell units in a second direction for heat exchange with the plurality of pouch cell units, the second direction intersecting the first direction. The battery device according to claim 25, wherein The membrane shell (11) has a flat surface on the side facing the heat exchange plate (50) in the second direction, and is connected to the heat exchange plate (50) by thermally conductive adhesive or thermally conductive pad. The battery device according to claim 25, wherein, The membrane shell (11) has a sealing boss (1101) formed on one side in the second direction. The battery device further includes an adhesive layer (40) that is bonded 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 protrusion height of the sealing boss (1101). The battery device according to any one of claims 25-27, wherein, The battery device further includes an adhesive layer (40) that is bonded between the heat exchange plate (50) and the pouch cell, a portion of which is configured to overflow between two adjacent pouch cells in the first direction to bond the two adjacent pouch cells. The battery device according to claim 24, wherein, The battery device further includes a base plate and an adhesive layer (40). The base plate is located on one side of the cell assembly in the second direction. The cell assembly and the base plate are bonded together by the adhesive layer (40). The surface of the soft-pack battery cell facing the adhesive layer (40) is a first surface. The two surfaces of the soft-pack battery cell in the first direction are both second surfaces. The first surface and the two second surfaces are connected by a chamfer. The battery device further includes a blocking member located at the chamfer. The blocking member is configured to prevent the adhesive layer (40) located at the chamfer from overflowing to the location of the second surface. The battery device according to claim 29, wherein, In the first direction, a blocking member is disposed between two adjacent pouch cell units. The battery device according to claim 29, wherein, The blocking component is a foam component, and the blocking component is bonded to the base plate. The battery device according to claim 29, wherein, The blocking component is an adhesive component, which is bonded to one end of the soft-pack battery cell facing the base plate. The battery device according to any one of claims 24-32, wherein Multiple pouch battery cells are stacked along the first direction. The battery device further includes a separator (20), the hardness of which is higher than that of the membrane shell (11). There are multiple separators (20), which are arranged at intervals in the first direction. At least two pouch battery cells are arranged between two adjacent separators (20). The battery device according to claim 33, wherein, The number of the soft-pack battery cells arranged sequentially between two adjacent separators (20) along the first direction is less than or equal to four. The battery device according to claim 33, wherein, The pouch battery cell extends along a third direction, which is the length direction of the pouch battery cell. The separator (20) extends along the length direction of the pouch battery cell, and the length of the separator (20) is greater than 80% of the length of the pouch battery cell. The battery device according to any one of claims 33-35, wherein, The number of battery cell groups is multiple, with at least two battery cell groups arranged in a third direction. The length of the separator (20) is greater than twice the length of the pouch cell, so that two adjacent cell groups arranged along the length direction of the pouch cell can share one separator (20). The battery device according to any one of claims 33-36, wherein, The thickness of the separator (20) along the first direction is less than the thickness of the pouch cell, and the width of the separator (20) along the second direction is greater than 80% of the width of the pouch cell. The battery device according to any one of claims 33-37, wherein, The thickness of the partition (20) along the first direction is 0.8 mm to 2.0 mm. The battery device according to any one of claims 33-38, wherein, The partition (20) is an aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate. The battery device according to any one of claims 33-39, wherein, The partition (20) is a solid structure. The battery device according to any one of claims 33-40, wherein, The partition (20) is a heat-conducting component and is thermally connected to the membrane shell (11). The battery device according to any one of claims 33-41, wherein, A heat exchange channel is formed inside the partition (20). The battery device of any one of claims 33-42, wherein The separator (20) is bonded to the adjacent soft-pack battery cell. The battery device of any one of claims 33-43, wherein, The separator (20) is fixed to the adjacent soft-pack battery cell by double-sided adhesive. The battery device of any one of claims 33-44, wherein, In the first direction, at least two adjacent pouch cell units are provided with a buffer (30), the hardness of the buffer (30) being less than the hardness of the membrane shell (11). The battery device of claim 45, wherein, In the first direction, at least two adjacent pouch cell units are simultaneously provided with the buffer (30) and the separator (20). The battery device of claim 45, wherein, In the first direction, at most one of the buffer (30) and the separator (20) is provided between any two adjacent pouch battery cells. The battery device according to any one of claims 45-47, wherein, In the first direction, at least one of the pouch cell cells is sandwiched between the buffer (30) and the separator (20). The battery device of claim 48, wherein In the first direction, one of the buffer (30) and the separator (20) is provided between any two adjacent pouch battery cells, and the buffer (30) and the separator (20) in the cell assembly are alternately arranged along the first direction. The battery device of any one of claims 45-49, wherein The buffer (30) covers more than 80% of the surface area of ​​the thickness side of the soft-pack battery cell. The battery device according to claim 24, wherein The pouch battery cell has conductive elements (12) at both ends in a third direction. The conductive elements (12) are electrically connected to the electrode assembly and are at least partially exposed outside the membrane shell (11). The conductive elements (12) on the same side of two adjacent pouch battery cells in the cell assembly are connected. The battery device of claim 51, wherein The cell assembly includes at least three pouch cell units, and the pouch cell unit located between two adjacent pouch cell units in the cell assembly is an intermediate cell. Of the two conductive elements (12) at both ends of the intermediate cell, one conductive element (12) is connected to the conductive element (12) on the same side of an adjacent pouch cell unit of the intermediate cell, and the other conductive element (12) is connected to the conductive element (12) on the same side of another adjacent pouch cell unit of the intermediate cell. The battery device of claim 51, wherein The two conductive elements (12) that form the connection are connected by overlapping, and at least one conductive element (12) is in a bent shape. The battery device of claim 51, wherein, The two conductive elements (12) that form the connection are connected by an adapter piece (70), which is in a bent shape. The battery device of claim 51, wherein The connection point is curved, and the curve is U-shaped. The battery device of any one of claims 51-55, wherein, The two tabs extending from both ends of the soft-pack battery cell have opposite polarities, and the two conductive elements (12) that are connected together have the same or opposite polarities. The battery device of any one of claims 51-56, wherein The number of battery cell groups is multiple, with at least two battery cell groups arranged in a third direction. The conductive elements (12) of the two adjacent pouch cell cells are directly connected along the third direction. The battery device according to claim 24, wherein The soft-pack battery cell can be any one of lithium iron phosphate battery cell, ternary battery cell, and solid-state battery cell. The battery device of claim 58, wherein, The pouch battery cell is a ternary lithium battery cell, and the battery device also includes a housing, in which multiple pouch battery cells are housed. In a second direction, the housing is provided with a pressure relief area. An energy storage device, wherein, include: A power conversion device and a battery device according to any one of claims 24-59, the battery device being used to store or provide electrical energy. An electric power utilization device, wherein, Includes a battery device according to any one of claims 24-59 or an energy storage device according to claim 60, wherein the battery device is used to store or provide electrical energy.

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