Battery pack, battery device and electric device

Abstract

The utility model relates to the technical field of batteries and discloses a battery pack, a battery device and a power utilization device. The battery pack comprises a plurality of soft package battery monomers, the separator divides the plurality of soft package battery monomers into a plurality of soft package units, each soft package unit is connected with the separator, each soft package unit comprises at least two soft package battery monomers, the separator defines a plurality of cavities which are separated from each other and are sequentially arranged along a first direction, the plurality of soft package units are in one-to-one correspondence with the plurality of cavities, and the plurality of soft package units are connected with the separator. One side, in the second direction, of each cavity is opened to form an opening, each cavity is provided with a bottom wall opposite to the opening, and at least part of the bottom wall of each cavity is connected with the corresponding soft package battery monomer in an adhesive mode. According to the technical scheme, the separator can play a role in separation and isolation, so that the risks of thermal runaway and short circuit of the soft package unit are reduced; and the stability of the position of the soft package unit can be improved by bonding the soft package battery monomer with the bottom wall of the cavity.

Description

Technical Field

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

[0002] At present, most new energy vehicles use power batteries as energy storage and kinetic energy devices. Power batteries are also used in other types of vehicles. The battery energy density of power batteries has a relatively important impact on the vehicle's endurance and power performance. Therefore, improving the energy density of batteries is a direction that needs to be studied in the process of continuous improvement and innovation of batteries.

[0003] Soft-pack battery cells can improve the energy density of the battery device due to the light weight of the aluminum-plastic film. However, the soft-pack battery cells in the box are prone to deformation due to their low structural strength, and thermal runaway can easily cause the risk of thermal runaway of other soft-pack battery cells. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery pack, a battery device and an electric device including the battery pack, which can reduce the extrusion deformation between soft-pack battery cells and reduce the risk of thermal runaway propagation between soft-pack battery cells.

[0005] In the first aspect, an embodiment of the utility model provides a battery pack, comprising: a plurality of soft-pack battery cells; a separator, wherein the separator separates the plurality of soft-pack battery cells into a plurality of soft-pack units, each of which is connected to the separator, and each of which comprises at least two soft-pack battery cells, the separator defines a plurality of cavities separated from each other and arranged in sequence along a first direction, the plurality of soft-pack units correspond one-to-one to the plurality of cavities, and are arranged in the corresponding cavities, one side of the cavity in a second direction is open to form an opening, the second direction is an up-and-down direction and intersects with the first direction, the cavity has a bottom wall arranged opposite to the opening in the second direction, and at least a portion of the bottom wall of the cavity is adhesively connected to the soft-pack battery cell.

[0006] In the above technical solution, since the separator separates multiple soft-pack battery cells into multiple soft-pack units, and each soft-pack unit is connected to the separator, the separator can not only play a role of separation and isolation between two adjacent soft-pack units, reduce the probability of thermal runaway gas propagating to the location of adjacent soft-pack units, and reduce the risk of causing thermal runaway of adjacent soft-pack units, but also reduce the probability of contact, extrusion and friction between soft-pack battery cells of adjacent soft-pack units, and reduce the risk of short circuit between soft-pack battery cells of adjacent soft-pack units; and the separator can also reduce the activity and deformation range of the soft-pack battery cells in each soft-pack unit, improve the stability of the position of the soft-pack unit in the battery pack, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells; in addition, the separator can also disperse external impact force, reduce the probability of a single soft-pack battery cell being subjected to excessive impact force, and improve the service life of the soft-pack battery cell. By using a separator to define a plurality of cavities separated from each other, and each soft-pack unit is respectively arranged in a corresponding cavity, not only can the number of parts be significantly reduced, the assembly efficiency and assembly accuracy of the battery pack be improved, but also the probability of mutual leakage between the plurality of cavities can be further reduced, and the risk of spreading when the soft-pack unit is thermally runaway can be reduced. The plurality of cavities are arranged in sequence along the first direction, which can not only simplify the structure of the separator, facilitate the processing and manufacturing of the separator, improve the processing efficiency, and reduce the processing cost, but also help to reduce the thickness of the partition between the two soft-pack units separated by the separator, reduce the occupied space, compact the battery pack structure, and improve the energy density of the battery pack. Since one side of the cavity in the second direction is open as an opening, the soft-pack battery cell can be loaded into the corresponding cavity of the separator through the opening position, which improves the assembly efficiency of the battery pack and reduces the maintenance difficulty of the battery pack. It is also convenient to arrange the heat exchanger on the side where the opening is located, and improve the thermal management efficiency of the battery pack. At least part of the bottom wall of the cavity is adhesively connected to the soft-pack battery cell, so that the soft-pack battery cell can be reliably fixed in the cavity. This not only reduces the shaking of the soft-pack battery cell in the cavity and reduces the risk of damage to the soft-pack battery cell, but also simplifies the connection and fixing structure between the soft-pack battery cell and the separator, reduces the difficulty of assembly, improves assembly efficiency and reduces costs.

[0007] In some embodiments, the separator includes: multiple first plate portions and multiple second plate portions, the number of the first plate portions is at least three, the multiple first plate portions are arranged in sequence along the first direction, the second plate portion is connected between two adjacent first plate portions, and the second plate portion cooperates with the two adjacent first plate portions to enclose a cavity.

[0008] In the above technical solution, since the separator includes multiple first plate portions and multiple second plate portions, and two adjacent first plate portions and the second plate portion connected between the two first plate portions cooperate to enclose a cavity for accommodating the soft-pack unit, the multiple first plate portions and the multiple second plate portions can constitute a separator of a frame structure. On the premise of effectively separating multiple soft-pack units, the structural strength of the separator is improved, the integrity and stability of the separator are enhanced, and the probability of cavity deformation of the battery pack when subjected to external impact force is reduced. At the same time, the structure of the separator is relatively simple and compact, which can improve the energy density of the battery pack.

[0009] In some embodiments, two ends of the second plate portion in the first direction are respectively connected to end edges of the same end of two adjacent first plate portions in the second direction.

[0010] In the above technical solution, since the two ends of the second plate portion in the first direction are respectively connected to the ends of the same end of the two adjacent first plate portions in the second direction, the second plate portion and the two adjacent first plate portions can be connected to form a U-shaped structure. In this way, the size of the cavity inside the U-shaped structure in the second direction can be increased, which is convenient for arranging soft-pack battery cells. In addition, the size of the cavity defined by the separator in the second direction can be made the same, making the structure of the separator more regular and compact, and improving the energy density of the battery pack.

[0011] In some embodiments, the plurality of second plate portions are all arranged on a same side of the plurality of first plate portions in the second direction.

[0012] In the above technical solution, since the plurality of second plate portions are arranged on the same side of the plurality of first plate portions in the second direction, not only can the cavity defined by the separator be opened toward the same side, which facilitates the loading of the soft-pack battery cells into the cavity of the separator from the same side of the separator, simplifies the assembly process, improves assembly efficiency, and simplifies the structure of the separator, facilitating processing and manufacturing. In addition, the arrangement of the plurality of second plate portions on the same side of the plurality of first plate portions is also conducive to improving the overall structural strength of the separator and improving the bending resistance of the separator, thereby better protecting the soft-pack battery cells.

[0013] In some embodiments, the plurality of second plate portions are respectively arranged on both sides of the plurality of first plate portions in the second direction.

[0014] In the above technical solution, since the multiple second plate portions are respectively arranged on both sides of the multiple first plate portions in the second direction, the second plate portions located on both sides in the second direction can respectively support the battery pack on both sides of the partition, balance the structural strength of the partition on both sides in the second direction, and can also enable the partition to define a plurality of cavities that form openings on both sides in the second direction, thereby reducing the probability of mutual interference between soft-pack units and reducing the risk of thermal runaway spread.

[0015] In some embodiments, two second plate portions adjacent to each other in the first direction are respectively arranged at two sides of the first plate portion in the second direction.

[0016] In the above technical solution, since the two second plate portions adjacent to each other in the first direction are respectively arranged on both sides of the first plate portion in the second direction, the isolation effect of adjacent soft-pack units can be improved, reducing the risk of causing short circuit or thermal runaway of adjacent soft-pack units.

[0017] In some embodiments, a pressure relief structure is provided on the second plate portion, and the pressure relief structure is configured to connect the cavity with the external space of the partition when the pressure in the cavity is greater than a preset pressure.

[0018] In the above technical solution, since the second plate portion is provided with a pressure relief structure, the pressure relief structure can promptly release the excessive pressure in the cavity, reduce the risk of explosion or rupture due to excessive cavity pressure, and improve the stability of the battery pack.

[0019] In some embodiments, the pressure relief structure is a structurally weak area on the second plate portion.

[0020] In the above technical solution, since the pressure relief structure is a structural weak area on the second plate portion, there is no need to set up additional pressure relief components while achieving pressure relief. This can not only reduce the number of components and assembly procedures, simplify the manufacturing process of the pressure relief structure, and reduce costs, but also reduce occupied space and improve the energy density of the battery pack.

[0021] In some embodiments, the structurally weak area is formed with notches or etchings.

[0022] In the above technical solution, since the structural weak area is formed with notches or etchings, the notches or etchings can guide the rupture direction of the structural weak area, increase the pressure relief area of ​​the structural weak area after rupture, and improve the speed and efficiency of pressure relief.

[0023] In some embodiments, the pressure relief structure is formed as a pressure relief hole that penetrates the second plate portion along a thickness direction of the second plate portion.

[0024] In the above technical solution, since the pressure relief structure is formed as a pressure relief hole that passes through the second plate portion, the pressure relief hole has a simple structure, is easy to process, and has stable and reliable pressure relief performance.

[0025] In some embodiments, the battery pack further includes: an insulating film, which is disposed on the second plate portion and completely covers the pressure relief hole.

[0026] In the above technical solution, since the pressure relief hole is covered with an insulating film, the insulating film can maintain a stable environment inside the battery pack, reduce the probability of short circuit between the soft-pack battery cells and external conductive components, and improve the reliability and durability of the battery pack.

[0027] In some embodiments, the thickness of the insulating film is greater than or equal to 0.03 mm and less than or equal to 0.3 mm.

[0028] In the above technical solution, the thickness of the insulating film is set between 0.03 mm and 0.3 mm, which can improve the insulation performance of the insulating film and reduce the probability of high voltage inside the battery pack breaking through the insulating film. It can also improve the toughness of the insulating film and reduce the probability of the insulating film breaking when subjected to external forces. In addition, it can also reduce the material cost of the insulating film.

[0029] In some embodiments, the thickness of the insulating film is greater than or equal to 0.1 mm and less than or equal to 0.2 mm.

[0030] In the above technical scheme, the thickness of the insulating film is greater than or equal to 0.1 mm and less than or equal to 0.2 mm. Under the premise of ensuring the insulating performance of the insulating film, the toughness of the insulating film can be further improved, the probability of the insulating film breaking when subjected to external force can be reduced, and the material cost of the insulating film can be further reduced.

[0031] In some embodiments, the thickness of the plate material of the separator is greater than or equal to 0.4 mm and less than or equal to 1 mm.

[0032] In the above technical solution, the thickness of the separator plate is greater than or equal to 0.4 mm and less than or equal to 1 mm, which can reduce the cost of the battery pack and improve the energy density of the battery pack while providing sufficient support for the soft-pack battery cells and effectively protecting the soft-pack battery cells.

[0033] In some embodiments, the thickness of the first plate portion is greater than the thickness of the second plate portion.

[0034] In the above technical solution, the thickness of the first plate portion is larger, which can improve the structural strength of the first plate portion, improve the structural strength of the partition, and enhance the supporting effect and separation effect on the soft-pack unit. The thickness of the second plate portion is smaller, which can facilitate the arrangement of the pressure relief structure on the second plate portion to achieve pressure relief from one side of the soft-pack unit in the second direction, thereby reducing the material cost of the second plate portion.

[0035] In some embodiments, the first plate portion and the second plate portion are connected by welding, snap-fitting or integrally formed.

[0036] In the above technical solution, the first plate portion and the second plate portion are welded or integrally formed, which can improve the connection reliability between the first plate portion and the second plate portion and enhance the sealing performance of the cavity. The first plate portion and the second plate portion are snap-connected, which can facilitate disassembly and maintenance and reduce the maintenance cost of the battery pack.

[0037] In some embodiments, a heat exchange channel is formed in the first plate portion.

[0038] In the above technical solution, a heat exchange channel is formed in the first plate portion, and the heat exchange channel is used to pass a heat exchange medium. The heat exchange medium can contact and exchange heat with the soft-pack unit through the first plate portion, thereby reducing the probability of heat accumulation inside the soft-pack unit, keeping the soft-pack battery cell in a suitable temperature range, and improving the performance and service life of the battery pack.

[0039] In some embodiments, the separator is a metal member.

[0040] In the above technical solution, the separator is a metal part, which can reduce the probability of deformation of the cavity where the soft-pack battery cell is located, improve the stability and service life of the battery pack, and further improve the thermal conductivity of the separator and improve the thermal management efficiency of the thermal management system for the battery pack.

[0041] In some embodiments, the separator is made of aluminum, aluminum alloy, stainless steel or nickel.

[0042] In the above technical solution, the separator is made of aluminum or aluminum alloy, which can reduce the weight of the separator and improve the energy density of the battery pack. The separator is made of stainless steel or nickel, which can improve the structural strength and corrosion resistance of the separator and improve the reliability and service life of the battery pack.

[0043] In some embodiments, the soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0044] In the above technical solution, the soft-pack battery cell is set to any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell can be flexibly set to different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell wider, so that the battery device can better meet different usage requirements.

[0045] In some embodiments, the soft-pack battery cell is a ternary battery cell, and a pressure relief zone is provided on the separator, and the pressure relief zone is configured to connect the inner space of the separator with the outer space of the separator when a preset condition is met.

[0046] In the above technical solution, since a pressure relief zone is provided on the separator, the pressure relief zone can timely release the high-temperature and high-pressure gas in the separator, reduce the risk of explosion or rupture due to excessive cavity pressure, and improve the stability of the battery pack.

[0047] In some embodiments, the pressure relief area is formed with a through hole penetrating the partition.

[0048] In the above technical solution, the pressure relief area is formed as a through hole that penetrates the partition. The through hole has a simple structure, is easy to process, and has stable and reliable pressure relief performance.

[0049] In some embodiments, the pressure relief area is a structurally weakened area of ​​the separator, and the structurally weakened area is provided with notches or etchings.

[0050] In the above technical solution, since the pressure relief zone is a structurally weakened zone of the separator, and the structurally weakened zone is formed with notches or etchings, the number of parts and assembly procedures can be reduced, the manufacturing process of the pressure relief zone can be simplified, and the cost can be reduced while achieving pressure relief. In addition, notches or etchings can guide the rupture direction of the structurally weakened zone, increase the pressure relief area of ​​the structurally weakened zone after rupture, and improve the speed and efficiency of pressure relief.

[0051] In some embodiments, the soft-pack battery cell includes a membrane shell, and a structural weak portion is disposed on the membrane shell.

[0052] In the above technical solution, since a structural weak portion is formed on the membrane shell, when the pressure inside the membrane shell is too high, the structural weak portion can be destroyed to timely release the excessive pressure inside the membrane shell, reduce the risk of explosion or rupture due to excessive pressure inside the membrane shell, and improve the stability of the battery pack. The structure of the structural weak portion is simple and does not require additional space, which can improve the energy density of the soft-pack battery cell.

[0053] In some embodiments, the partition includes a first shell wall and two second shell walls, the first shell wall extends along a first direction, the two second shell walls are respectively connected to the two ends of the second shell wall in the first direction, and extend away from the first shell wall along the second direction, the first direction intersects with the second direction, the first shell wall and the two second shell walls cooperate to define a receiving cavity, and the ends of the two second shell walls away from the first shell wall cooperate to define an open opening connected to the receiving cavity, and the soft package unit is arranged in the receiving cavity.

[0054] In the above technical solution, the separator is set in a U shape, which can facilitate the assembly of the soft-pack unit, improve assembly efficiency, reduce costs, and facilitate later maintenance, reducing maintenance costs. It can also better restrain multiple soft-pack battery cells while reducing the additional support partitions of the soft-pack battery cells, thereby improving the energy density of the battery device.

[0055] In some embodiments, multiple soft-pack units are arranged in sequence along a first direction, and the battery pack also includes: a busbar, which is arranged on both sides of the multiple soft-pack units in a third direction, the busbar is electrically connected to the soft-pack units, and the first direction intersects with the third direction.

[0056] In the above technical solution, since a plurality of soft-pack units are arranged in sequence along a first direction, the busbar is electrically connected to the soft-pack units and arranged on both sides of the soft-pack units in a third direction, the busbar can be conveniently electrically connected to a plurality of soft-pack units, thereby improving the efficiency of current output or input of the battery pack, so that the battery pack can stably supply power to the outside or receive charging. At the same time, the busbar can reasonably utilize the spatial structure formed by the arrangement of the soft-pack units without occupying the arrangement space of the soft-pack units in the first direction, thereby optimizing the spatial configuration inside the battery pack and improving the energy density of the battery pack.

[0057] In some embodiments, the battery pack also includes: two poles, which are respectively connected to the busbars on both sides of the soft-pack unit in the third direction, wherein the poles are arranged on both sides of the partition in the third direction, or the poles are arranged on one side of the partition in the second direction, and the second direction intersects with both the first direction and the third direction.

[0058] In the above technical solution, the poles are arranged on both sides of the separator in the third direction, so that the poles and the busbars can be concentrated on the same side of the separator, which is convenient for the busbars to be directly connected to the poles and has a compact structure; the poles are arranged on one side of the separator in the second direction, so that the poles and the busbars can be arranged on different sides of the separator respectively, and the space on different sides of the separator in different directions is comprehensively utilized, thereby improving the utilization rate of the space around the separator and improving the energy density of the battery pack.

[0059] In a second aspect, an embodiment of the present invention provides a battery device, comprising: a box body having a receiving cavity; and a battery pack according to the first aspect of the present invention, the battery pack being disposed in the receiving cavity.

[0060] In the above technical solution, since the electrical device is provided with the above-mentioned battery pack, and since the separator of the battery pack separates a plurality of soft-pack battery cells into a plurality of soft-pack units, and each soft-pack unit is connected to the separator, the separator can not only play a role of separation and isolation between two adjacent soft-pack units, reduce the probability of thermal runaway gas propagating to the location of the adjacent soft-pack unit, and reduce the risk of causing thermal runaway of the adjacent soft-pack unit, but also reduce the probability of contact, extrusion and friction between the soft-pack battery cells of adjacent soft-pack units, and reduce the risk of short circuit between the soft-pack battery cells of adjacent soft-pack units; and the separator can also reduce the activity and deformation range of the soft-pack battery cells in each soft-pack unit, improve the stability of the position of the soft-pack unit in the battery pack, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells; in addition, the separator can also disperse external impact force, reduce the probability of a single soft-pack battery cell being subjected to excessive impact force, and improve the service life of the soft-pack battery cell, thereby improving the service life of the battery device.

[0061] In some embodiments, an exhaust passage is provided in the box body, a pressure relief structure is provided on the partition, and the pressure relief structure is communicated with the exhaust passage.

[0062] In the above technical solution, an exhaust channel is provided in the box body, and the pressure relief structure on the partition is connected to the exhaust channel. When thermal runaway occurs in the soft-pack unit, the thermal runaway gas and heat can be discharged from the box body through the exhaust channel in time, thereby maintaining the pressure in the box body stable and reducing the probability of explosion of the battery device due to continuous increase in pressure in the box body.

[0063] In some embodiments, the battery device further includes: a heat exchanger, which is arranged in the accommodating cavity and located between the battery pack and the inner wall of the box body, and is used for heat exchange with the soft-pack battery cell.

[0064] In the above technical solution, by arranging the heat exchanger in the accommodating cavity for heat exchange with the soft-pack battery monomer, the soft-pack battery monomer can be kept in a suitable operating temperature range, the charging and discharging efficiency of the soft-pack battery monomer can be improved, and the service life of the battery device can be extended.

[0065] In some embodiments, the heat exchange element is disposed at the bottom of the box.

[0066] In the above technical solution, the heat exchange component is arranged at the bottom of the box body, which can effectively absorb the heat transferred downward by the soft-pack battery cell when working, improve the heat exchange efficiency, and at the same time, effectively utilize the bottom space of the box body to make the layout inside the battery device compact and reasonable.

[0067] In some embodiments, the battery pack and the heat exchange element are bonded together by an adhesive layer.

[0068] In the above technical solution, the battery pack and the heat exchanger are bonded together by an adhesive layer, which can simplify the connection structure between the battery pack and the heat exchanger, improve assembly efficiency, and achieve close fit between the heat exchanger and the battery pack, thereby improving heat conduction efficiency. In addition, the adhesive layer can also play a role in buffering and vibration reduction between the battery pack and the heat exchanger, thereby increasing the service life of the battery device.

[0069] In some embodiments, a portion of the adhesive layer is configured to overflow between two adjacent soft-pack battery cells in a first direction to adhesively connect the two adjacent soft-pack battery cells, and the first direction is a thickness direction of the soft-pack battery cells.

[0070] In the above technical solution, a part of the adhesive layer overflows between two adjacent soft-pack battery cells to achieve adhesive connection of adjacent soft-pack battery cells, which can not only enhance the integrity of the battery pack, make the connection between adjacent soft-pack battery cells tighter, reduce the risk of relative displacement between soft-pack battery cells, and improve the overall structural stability of the battery pack, but also help to improve the heat conduction efficiency between the heat exchange component and the soft-pack battery cell, and improve the thermal management performance of the battery pack.

[0071] In a third aspect, an embodiment of the present invention provides an electrical device, comprising the battery device according to the second aspect of the present invention.

[0072] In the above-mentioned embodiment, by setting the battery device of the above-mentioned second aspect, the separator of the battery pack separates multiple soft-pack battery cells into multiple soft-pack units, and each soft-pack unit is connected to the separator. The separator can not only play a role of separation and isolation between two adjacent soft-pack units, reduce the probability of thermal runaway gas propagating to the location of the adjacent soft-pack unit, and reduce the risk of causing thermal runaway of adjacent soft-pack units, but also reduce the probability of contact, extrusion and friction between the soft-pack battery cells of adjacent soft-pack units, and reduce the risk of short circuit between the soft-pack battery cells of adjacent soft-pack units; and the separator can also reduce the activity and deformation range of the soft-pack battery cells in each soft-pack unit, improve the stability of the position of the soft-pack unit in the battery pack, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells; in addition, the separator can also disperse external impact force, reduce the probability of a single soft-pack battery cell being subjected to excessive impact force, improve the service life of the soft-pack battery cell, and improve the service life of the battery device, thereby improving the overall performance of the electrical device.

[0073] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the utility model;

[0075] Figure 2 is an exploded view of a battery device according to an embodiment of the utility model;

[0076] Figure 3 is an exploded view of a battery pack according to some embodiments of the present invention;

[0077] Figure 4 yes Figure 3 An exploded view of the battery pack from another angle shown in FIG.

[0078] Figure 5 is a schematic structural diagram of a battery pack according to other embodiments of the utility model;

[0079] Figure 6 yes Figure 5 A schematic structural diagram of the battery pack from another angle is shown in FIG.

[0080] Reference numerals:

[0081] 1. Electrical devices;

[0082] 1000, battery device; 2000, controller; 3000, motor;

[0083] 100. Battery pack;

[0084] 10. Soft pack unit; 11. Soft pack battery cell;

[0085] 20. separator; 201. cavity;

[0086] 21. first plate portion; 22. second plate portion;

[0087] 400, box body; 410, box body; 420, cover plate; 401, accommodating cavity;

[0088] X, first direction; Z, second direction; Y, third direction. DETAILED DESCRIPTION

[0089] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0091] In the description of the embodiments of the present utility model, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0092] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0093] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0094] In the description of the embodiments of the present invention, the term "plurality" refers to more than two (including two).

[0095] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0096] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0097] The battery apparatus mentioned in the embodiment of the present utility model may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0098] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0099] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0100] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0101] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0102] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0103] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0104] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0105] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0106] The battery cells mentioned in the embodiments of the present invention may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present invention do not limit this. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present invention do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present invention do not limit this.

[0107] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator.

[0108] Among them, the positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter sheet, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0109] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter sheet, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0110] At the same time, battery cells mainly rely on the movement of metal ions between the positive electrode and the negative electrode to work. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc., the material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During the charge and discharge process, Li+ is embedded and de-embedded back and forth between the two electrodes: when charging, Li+ is de-embedded from the positive electrode, embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

[0111] The technical solutions described in the embodiments of the present utility model are applicable to various electrical devices using battery packs and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0112] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, battery devices, as the power source of electric vehicles, play an irreplaceable and important role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of energy density and reliability.

[0113] Since the soft-pack battery cell uses an aluminum-plastic film to wrap the electrode assembly and electrolyte, the aluminum-plastic film is light in weight and can significantly reduce the weight of the battery device and improve the energy density of the battery device.

[0114] However, in the battery device of the related art, when soft-pack battery cells are used, due to the low strength of the aluminum-plastic film, when multiple soft-pack battery cells are arranged in a box, the soft-pack battery cells are easily squeezed and deformed against each other, resulting in a greater risk of short circuit. In addition, when thermal runaway occurs in a certain soft-pack battery cell, the thermal runaway gas is easy to spread within the battery device, which can easily cause the risk of thermal runaway of the remaining soft-pack battery cells in the battery device.

[0115] Based on the above considerations, in order to reduce the risk of thermal runaway spreading between soft-pack battery cells and reduce the mutual extrusion between soft-pack battery cells, the utility model designs a battery pack, in which the separator of the battery pack separates multiple soft-pack battery cells into multiple soft-pack units, each soft-pack unit is connected to the separator, and the separator can not only play the role of separation and isolation between two adjacent soft-pack units, reduce the probability of thermal runaway gas propagating to the location of adjacent soft-pack units, and reduce the risk of causing thermal runaway of adjacent soft-pack units, but also reduce the contact, extrusion and friction between the soft-pack battery cells of adjacent soft-pack units, and reduce the risk of short circuit between the soft-pack battery cells of adjacent soft-pack units; and the separator can also reduce the activity and deformation range of the soft-pack battery cells in each soft-pack unit, improve the stability of the position of the soft-pack unit in the battery pack, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells.

[0116] The embodiment of the utility model provides an electric device using the battery pack or battery device disclosed in the present invention as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0117] For the convenience of description, the following embodiments take the electric device 1 as a vehicle as an example to introduce the structures of the electric device 1 , the battery device 1000 and the battery cell of the present invention in detail.

[0118] Please refer to Figure 1 , Figure 1The power device 1 provided for some embodiments of the utility model is a structural schematic diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device 1000, and the battery device 1000 can be arranged at the bottom, head or tail of the vehicle. The battery device 1000 can be used for powering the vehicle, for example, the battery device 1000 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery device 1000 to power the motor 3000, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the utility model, the battery device 1000 can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0119] Please refer to Figure 2 , Figure 2 The exploded view of the battery device 1000 provided in some embodiments of the present invention. The battery device 1000 comprises a box body 400 and a battery pack 100 . The box body 400 is used to provide an assembly space for the battery pack 100 . The battery pack 100 is accommodated in the box body 400 .

[0120] Reference below Figure 3-Figure 6 A battery pack 100 according to an embodiment of the first aspect of the present invention is described. Figure 3 is an exploded view of a battery pack 100 according to some embodiments of the present invention; Figure 4 yes Figure 3 An exploded view of the battery pack 100 from another angle shown in FIG. Figure 5 is a schematic structural diagram of a battery pack 100 according to other embodiments of the utility model; Figure 6 yes Figure 5 FIG. 1 is a schematic structural diagram of the battery pack 100 at another angle.

[0121] The present utility model embodiment provides a battery pack 100, such as Figure 3 and Figure 4As shown, the battery pack 100 includes: a plurality of soft-pack battery cells 11 and a separator 20, the separator 20 separates the plurality of soft-pack battery cells 11 into a plurality of soft-pack units 10, each of the soft-pack units 10 is connected to the separator 20, and each of the soft-pack units 10 includes at least two soft-pack battery cells 11, the separator 20 defines a plurality of cavities 201 that are separated from each other and sequentially arranged along a first direction X, the plurality of soft-pack units 10 correspond one-to-one to the plurality of cavities 201, and are arranged in the corresponding cavities 201, one side of the cavity 201 in the second direction Z is open to form an opening, the second direction Z is a vertical direction and intersects with the first direction X, the cavity 201 has a bottom wall that is arranged opposite to the opening in the second direction Z, and at least a portion of the bottom wall of the cavity 201 is bonded to the soft-pack battery cell 11.

[0122] In some embodiments, the soft-pack battery cell 11 includes a film shell and an electrode assembly and an electrolyte wrapped in the film shell, wherein the film shell may be an aluminum-plastic film, and the electrode assembly includes a stacked positive electrode sheet, a negative electrode sheet, and a separator.

[0123] The number of soft-pack battery cells 11 in the battery pack 100 is not less than four. For example, the battery pack 100 may include four, five, seven, ten, fifteen, twenty, thirty or more soft-pack battery cells 11 .

[0124] The separator 20 can separate the multiple soft-pack battery cells 11 of the battery pack 100 into two or more soft-pack units 10. For example, the separator 20 can separate the multiple soft-pack battery cells 11 of the battery pack 100 into two, three, four, five, six, seven, eight, nine, ten or more soft-pack units 10. The number of soft-pack battery cells 11 in each soft-pack unit 10 can be two, three, four, five, six, seven or more. Including multiple soft-pack battery cells 11 in each soft-pack unit 10 can further compact the structure of the battery pack 100 and improve the energy density of the battery pack 100.

[0125] In some embodiments, the plurality of soft-pack battery cells 11 in each soft-pack unit 10 may be connected in parallel to each other to increase the current of the soft-pack unit 10 .

[0126] Each soft-pack unit 10 is connected to the separator 20. For example, the soft-pack unit 10 can be bonded, clamped, or connected to the separator 20 by fasteners. Each soft-pack unit 10 is connected to the separator 20. The multiple soft-pack battery cells 11 in each soft-pack unit 10 can be connected to the separator 20 as a whole, or the multiple soft-pack battery cells 11 in the soft-pack unit 10 can be connected to the separator 20 separately, or a part of the soft-pack battery cells 11 in the soft-pack unit 10 can be connected to the separator 20, and the other part of the soft-pack battery cells 11 are not connected to the separator 20.

[0127] In this embodiment, by connecting the soft-pack unit 10 with the separator 20, the separator 20 can play the role of fixing, limiting and supporting the soft-pack battery cells 11 in the soft-pack unit 10. Specifically, the separator 20 can define the cavity 201 by itself, or cooperate with other structures of the battery device 1000 to define the cavity 201. The multiple soft-pack battery cells 11 of the soft-pack unit 10 are arranged in the corresponding cavity 201. The separator 20 can limit the multiple soft-pack battery cells 11 of the soft-pack unit 10 in the corresponding cavity 201, reduce the range of movement and deformation of the soft-pack battery cells 11, reduce the probability of excessive displacement of the soft-pack battery cells 11, improve the stability of the position of the soft-pack unit 10 in the battery pack 100, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells 11.

[0128] When the battery device 1000 is subjected to external impact force, the separator 20 can disperse the external force to various positions of the separator 20, or transfer the force to other components of the battery device 1000, such as to the box body 400, thereby reducing the probability of a single soft-pack battery cell 11 being subjected to excessive impact force and improving the service life of the soft-pack battery cell 11.

[0129] Since the separator 20 separates the multiple soft-pack battery cells 11 into multiple soft-pack units 10, the separator 20 can play a role of separation and isolation between two adjacent soft-pack units 10. When a soft-pack unit 10 among the multiple soft-pack units 10 has thermal runaway, the separator 20 can reduce the probability of the thermal runaway gas propagating to the location of the adjacent soft-pack unit 10, reduce the heat transferred to the adjacent soft-pack unit 10, and reduce the risk of causing thermal runaway of the adjacent soft-pack unit 10. Since the separator 20 separates the soft-pack battery cells 11 of adjacent soft-pack units 10, it can also reduce the probability of contact, compression and friction between the soft-pack battery cells 11 of adjacent soft-pack units 10, and reduce the risk of short circuit between the soft-pack battery cells 11 of adjacent soft-pack units 10. In addition, since the multiple soft-pack battery cells 11 are separated into multiple soft-pack units 10, when the battery pack 100 fails, it can be easier to determine the specific location of the failure, which is convenient for rapid fault diagnosis and maintenance.

[0130] In the related art, in order to isolate adjacent soft-pack units 10, multiple soft-pack battery cells 11 are connected in parallel to form a soft-pack unit 10, and then the soft-pack unit 10 is embedded in a U-shaped shell, wherein one soft-pack unit 10 is correspondingly arranged in one U-shaped shell. However, since the U-shaped shells are independent of each other, the structural strength is low, there are many parts, and the assembly is complicated.

[0131] In the embodiment of the utility model, a plurality of soft-pack battery cells 11 are separated into a plurality of soft-pack units 10 by using a separator 20, that is, one separator 20 can separate at least two soft-pack units 10. In this way, not only the integrity and structural strength of the separator 20 can be enhanced, but also the number of separators 20 can be reduced, the difficulty of assembly can be reduced, the assembly efficiency can be improved, the structure of the battery pack 100 can be compacted, the space utilization rate can be improved, and the energy density of the battery pack 100 can be increased.

[0132] In the above technical solution, since the separator 20 separates the multiple soft-pack battery cells 11 into multiple soft-pack units 10, each soft-pack unit 10 is connected to the separator 20, the separator 20 can not only play a role of separation and isolation between two adjacent soft-pack units 10, reduce the probability of thermal runaway gas propagating to the location of the adjacent soft-pack unit 10, and reduce the risk of causing thermal runaway of the adjacent soft-pack unit 10, but also reduce the probability of contact, extrusion and friction between the soft-pack battery cells 11 of the adjacent soft-pack units 10, and reduce the risk of short circuit between the soft-pack battery cells 11 of the adjacent soft-pack units 10; and the separator 20 can also reduce the range of movement and deformation of the soft-pack battery cells 11 in each soft-pack unit 10, improve the stability of the position of the soft-pack unit 10 in the battery pack 100, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells 11; in addition, the separator 20 can also disperse external impact force, reduce the probability of a single soft-pack battery cell 11 being subjected to excessive impact force, and improve the service life of the soft-pack battery cell 11.

[0133] In some embodiments of the present invention, the partition 20 defines a plurality of cavities 201 separated from each other, the plurality of cavities 201 correspond one-to-one to the plurality of soft-pack units 10 , and each soft-pack unit 10 is arranged in a corresponding cavity 201 .

[0134] Specifically, the separator 20 defines a plurality of cavities 201 through its own structure, and the plurality of cavities 201 are separated from each other. For example, the separator 20 may define two, three, four, five, six, seven, eight, nine, ten or more cavities 201.

[0135] In some embodiments, the separator 20 may define a plurality of cavities 201 sequentially arranged along the first direction X, the second direction Z, or the third direction Y. In other embodiments, a portion of the plurality of cavities 201 defined by the separator 20 may be arranged along the first direction X, and a portion may be arranged along the second direction Z. In other embodiments, a portion of the plurality of cavities 201 defined by the separator 20 may be arranged along the first direction X, a portion may be arranged along the second direction Z, and a portion may be arranged along the third direction Y. The first direction X, the second direction Z, and the third direction Y intersect each other.

[0136] Among them, the first direction X intersects with the second direction Z, which means that the first direction X is not parallel to the second direction Z, and the first direction X and the second direction Z are arranged at an angle. For example, the angle between the first direction X and the second direction Z can be 30°, 45°, 60°, 80° or 90°, etc. In some specific examples, the first direction X and the second direction Z are perpendicular to each other. Similarly, it can be known that the first direction X intersects with the third direction Y and the second direction Z intersects with the third direction Y, which will not be repeated here one by one.

[0137] In some specific embodiments, the first direction X may be the length direction of the battery device 1000 and the battery pack 100, the second direction Z may be the height direction of the battery device 1000 and the battery pack 100, the third direction Y may be the width direction of the battery device 1000 and the battery pack 100, and the first direction X, the second direction Z and the third direction Y may be perpendicular to each other.

[0138] In this embodiment, the separator 20 itself defines a plurality of cavities 201 separated from each other. Compared with a plurality of separators 20 cooperating to define one cavity 201 or a single separator 20 defining one cavity 201, the number of separators 20 can be significantly reduced, and the assembly efficiency and assembly accuracy of the battery pack 100 can be improved. In addition, the separator 20 itself defines a plurality of cavities 201, which can reduce the connection position and range of the separator 20 and other components, further enhance the separation effect between adjacent soft-pack units 10, further reduce the probability of mutual leakage between the plurality of cavities 201, and reduce the risk of spreading when the soft-pack unit 10 is in thermal runaway.

[0139] In the above technical solution, a plurality of cavities 201 separated from each other are defined by using a separator 20, and each soft-pack unit 10 is respectively arranged in a corresponding cavity 201, which can not only significantly reduce the number of components and improve the assembly efficiency and assembly accuracy of the battery pack 100, but also further reduce the probability of mutual leakage between the plurality of cavities 201 and reduce the risk of thermal runaway of the soft-pack unit 10.

[0140] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, a plurality of cavities 201 are arranged in sequence along the first direction X.

[0141] For example, the first direction X is the length direction of the battery pack 100. The battery pack 100 may include a partition 20 and a plurality of soft-pack units 10. The partition 20 extends along the length direction of the battery pack 100 and defines a plurality of cavities 201 that are arranged in sequence along the length direction of the battery pack 100. The plurality of soft-pack units 10 correspond one-to-one to the plurality of cavities 201 and are arranged in the corresponding cavities 201.

[0142] In the related art, the soft-pack unit 10 is embedded in a U-shaped shell, and a plurality of U-shaped shells arranged in sequence are arranged to accommodate the plurality of soft-pack units 10. In this solution, there are two U-shaped shell side walls between two soft-pack units 10, which increases the distance between the two soft-pack units 10 and increases the occupied space. In this embodiment, the separator 20 defines a plurality of cavities 201 arranged in sequence along the first direction X, which can help reduce the thickness of the partition separated by the separator 20 between the two soft-pack units 10, reduce the occupied space, and improve the energy density of the battery pack 100.

[0143] In the above technical solution, multiple cavities 201 are arranged in sequence along the first direction X, which can not only simplify the structure of the separator 20, facilitate the processing and manufacturing of the separator 20, improve processing efficiency, and reduce processing costs, but also help to reduce the thickness of the partition 20 separating the two soft-pack units 10, reduce the occupied space, compact the battery pack 100 structure, and improve the energy density of the battery pack 100.

[0144] In some embodiments of the present invention, Figure 3 and Figure 5 As shown, one side of any cavity 201 in the second direction Z is open to form an opening.

[0145] For example, the second direction Z is the up-down direction, and the cavity 201 may be opened on the upper side to form an opening, or the cavity 201 may be opened on the lower side to form an opening. The openings of the multiple cavities 201 may be arranged on the same side of the partition 20 in the up-down direction, for example, the openings of the multiple cavities 201 may all be arranged downward or upward. The openings of the multiple cavities 201 may be partially arranged on the upper side of the partition 20, and the other partially arranged on the lower side of the partition 20.

[0146] Since one side of the cavity 201 in the second direction Z is open, when assembling the battery pack 100, the soft-pack battery cell 11 can be loaded into the corresponding cavity 201 of the separator 20 through the opening position, thereby improving the assembly efficiency of the battery pack 100; at the same time, when the soft-pack unit 10 in the cavity 201 fails, the soft-pack unit 10 can also be taken out through the opening, thereby reducing the difficulty of maintenance of the battery pack 100.

[0147] In addition, since one side of the cavity 201 is open, the heat exchange component of the battery device 1000 can be arranged on the side where the opening of the cavity 201 is located, and fit with the soft-pack battery cell 11 at the opening position, thereby facilitating direct thermal management of the soft-pack battery cell 11 and improving thermal management efficiency.

[0148] In the above technical solution, since one side of the cavity 201 in the second direction Z is open as an opening, the soft-pack battery cell 11 can be loaded into the corresponding cavity 201 of the partition 20 through the opening position, thereby improving the assembly efficiency of the battery pack 100 and reducing the maintenance difficulty of the battery pack 100. It is also convenient to arrange the heat exchange component on the side where the opening is located, thereby improving the thermal management efficiency of the battery pack 100.

[0149] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the second direction Z is the up-down direction, the cavity 201 has a bottom wall arranged opposite to the opening in the second direction Z, and at least part of the bottom wall of the cavity 201 is bonded to the soft-pack battery cell 11 .

[0150] In some embodiments, among the multiple cavities 201 defined by the separator 20, the soft-pack units 10 in some cavities 201 are bonded to the bottom wall of the cavity 201, and the soft-pack units 10 in other cavities 201 are not bonded to the bottom wall of the cavity 201. In other embodiments, the soft-pack units 10 in all cavities 201 are bonded to the bottom wall of the cavity 201.

[0151] Furthermore, in one cavity 201 , the plurality of soft-pack battery cells 11 in the soft-pack unit 10 are adhesively connected to the bottom wall of the cavity 201 , so that each soft-pack battery cell 11 is fixed to the bottom wall of the cavity 201 .

[0152] In this embodiment, the soft-pack battery cell 11 is bonded to the bottom wall of the cavity 201, so that the soft-pack battery cell 11 can be reliably fixed in the cavity 201. When the battery pack 100 is subjected to external force, the probability of the soft-pack battery cell 11 shaking in the cavity 201 can be reduced, the probability of collision or friction between the soft-pack battery cells 11 can be reduced, the risk of damage to the soft-pack battery cell 11 can be reduced, and the risk of short circuit between the soft-pack battery cells 11 can be reduced. In addition, the soft-pack battery cell 11 is connected to the bottom wall of the cavity 201 by bonding, which can simplify the connection and fixing structure between the soft-pack battery cell 11 and the separator 20, reduce the difficulty of assembly, improve assembly efficiency, and reduce costs.

[0153] In the above technical solution, since at least part of the bottom wall of the cavity 201 is adhesively connected to the soft-pack battery cell 11, the soft-pack battery cell 11 can be reliably fixed in the cavity 201. Therefore, it is possible to reduce the shaking of the soft-pack battery cell 11 in the cavity 201 and reduce the risk of damage to the soft-pack battery cell 11, and also simplify the connection and fixing structure between the soft-pack battery cell 11 and the separator 20, thereby reducing the difficulty of assembly, improving assembly efficiency and reducing costs.

[0154] In some embodiments of the present invention, Figure 3-Figure 6 As shown, the separator 20 includes: a plurality of first plate portions 21 and a plurality of second plate portions 22, the number of the first plate portions 21 is at least three, the plurality of first plate portions 21 are arranged in sequence along the first direction X, the second plate portion 22 is connected between two adjacent first plate portions 21, and the second plate portion 22 cooperates with the two adjacent first plate portions 21 to enclose a cavity 201.

[0155] For example, the number of the first plate portions 21 may be three, four, five, six, seven, eight, nine, ten or more. The number of the second plate portions 22 may be two, three, four, five, six, seven, eight, nine, ten or more.

[0156] In some examples, the first plate portion 21 may be in the shape of a plate arranged at an angle to the first direction X, and a plurality of first plate portions 21 are arranged in sequence along the first direction X, wherein any two of the plurality of first plate portions 21 may be arranged in parallel or at an angle. For example, the first plate portion 21 is a flat plate arranged perpendicular to the first direction X, and a plurality of first plate portions 21 are parallel to each other and arranged at intervals in the first direction X.

[0157] In some examples, the second plate portion 22 extends along the first direction X, and the two ends of the second plate portion 22 in the first direction X are respectively connected to the two first plate portions 21. Further, the two ends of the second plate portion 22 in the first direction X can be connected to the ends of the same side of the two first plate portions 21. In this case, the second plate portion 22 and the two first plate portions 21 enclose a cavity 201 for accommodating the soft package unit 10.

[0158] In addition, the two ends of the second plate portion 22 in the first direction X can also be connected to the non-end positions of the two first plate portions 21. For example, the two ends of the second plate portion 22 are connected to the middle positions of the two first plate portions 21 in the second direction Z, and the second direction Z intersects with the first direction X. At this time, the second plate portion 22 and the two first plate portions 21 can enclose two cavities 201, and the two cavities 201 are respectively located on both sides of the second plate portion 22 in the thickness direction. The two cavities 201 can be used to accommodate two soft-pack units 10, wherein the two cavities 201 can be arranged along the second direction Z, and the two cavities 201 can also be arranged along the third direction Y.

[0159] In this embodiment, multiple first plate portions 21 and multiple second plate portions 22 are alternately arranged along the first direction X and connected in sequence, wherein the first plate portion 21 can not only realize the effective isolation of two adjacent soft-pack units 10 in the first direction X, but also support the overall structure of the partition 20, thereby improving the stability of the partition 20; the second plate portion 22 is connected between two adjacent first plate portions 21, so that the partition 20 can be connected into a frame structure, thereby enhancing the integrity of the partition 20, improving the structural strength of the partition 20, and reducing the probability of deformation of the cavity 201 when the battery pack 100 is subjected to external impact force.

[0160] In addition, the first plate portion 21 and the second plate portion 22 of the separator 20 are alternately arranged and connected along the first direction X, so that the shape and size of the cavity 201 enclosed between the first plate portion 21 and the second plate portion 22 can be flexibly adjusted according to the shape and size of the soft-pack unit 10 or the soft-pack battery cell 11, thereby improving the space utilization of the cavity 201 and improving the energy density of the battery pack 100.

[0161] Furthermore, the first plate portion 21 and the second plate portion 22 are thermally conductive material pieces with good thermal conductivity. Since the second plate portion 22 and the two adjacent first plate portions 21 enclose a cavity 201, the contact area between the soft-pack unit 10 and the inner wall of the cavity 201 can be increased. The first plate portion 21 and the second plate portion 22 can play a role in dissipating heat for the soft-pack battery cell 11, thereby improving the heat dissipation effect of the soft-pack battery cell 11 and enhancing the thermal management performance of the battery pack 100.

[0162] In addition, in the present embodiment, two adjacent soft-pack units 10 in the first direction X are separated by a first plate portion 21. Compared with the solution of a single U-shaped shell, the present embodiment can reduce the thickness of the partition structure between two adjacent soft-pack units 10, compact the structure of the battery pack 100 in the first direction X, reduce the space occupied in the first direction X, and improve the energy density of the battery pack 100.

[0163] In the above technical solution, since the separator 20 includes multiple first plate portions 21 and multiple second plate portions 22, and two adjacent first plate portions 21 cooperate with the second plate portion 22 connected between the two first plate portions 21 to enclose a cavity 201 for accommodating the soft-pack unit 10, the multiple first plate portions 21 and the multiple second plate portions 22 can constitute a separator 20 of a frame structure. On the premise of effectively separating multiple soft-pack units 10, the structural strength of the separator 20 is improved, the integrity and stability of the separator 20 are enhanced, and the probability of deformation of the cavity 201 when the battery pack 100 is subjected to external impact force is reduced. In addition, the structure of the separator 20 is relatively simple and compact, which can improve the energy density of the battery pack 100.

[0164] In some embodiments of the present invention, Figure 3 As shown, two ends of the second plate portion 22 in the first direction X are respectively connected to the ends of the same end of two adjacent first plate portions 21 in the second direction Z, and the first direction X and the second direction Z intersect.

[0165] In some embodiments, the multiple second plate portions 22 can be arranged on the same side of the multiple first plate portions 21 in the second direction Z, or can be arranged on both sides of the multiple first plate portions 21 in the second direction Z. This embodiment does not make any specific limitations on this, as long as each second plate portion 22 can be combined with two adjacent first plate portions 21 to form a U-shaped structure.

[0166] In the above technical solution, since the two ends of the second plate portion 22 in the first direction X are respectively connected to the ends of the same end of the two adjacent first plate portions 21 in the second direction Z, the second plate portion 22 and the two adjacent first plate portions 21 can be connected to form a U-shaped structure. In this way, the size of the cavity 201 inside the U-shaped structure in the second direction Z can be increased, which is convenient for arranging the soft-pack battery cells 11. In addition, the size of the cavity 201 defined by the separator 20 in the second direction Z can be made the same, making the structure of the separator 20 more regular and compact, and improving the energy density of the battery pack 100.

[0167] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the plurality of second plate portions 22 are all arranged on the same side of the plurality of first plate portions 21 in the second direction Z.

[0168] For example, the second direction Z is the up-down direction of the battery pack 100, and the plurality of second plate portions 22 can be arranged on the upper side of the plurality of first plate portions 21, and the two ends of each second plate portion 22 are respectively connected to the end edges of the upper ends of the two adjacent first plate portions 21. At this time, the lower sides of the plurality of cavities 201 enclosed by the partition 20 are all open to form openings; the plurality of second plate portions 22 can also be arranged on the lower side of the plurality of first plate portions 21, and the two ends of each second plate portion 22 are respectively connected to the end edges of the lower ends of the two adjacent first plate portions 21. At this time, the upper sides of the plurality of cavities 201 enclosed by the partition 20 are all open to form openings.

[0169] In some examples, the plurality of second plate portions 22 may be arranged at intervals along the second direction Z. In other examples, the plurality of second plate portions 22 may be an integral piece, for example, the plurality of second plate portions 22 are sequentially connected to form a flat plate shape perpendicular to the second direction Z, and the plurality of first plate portions 21 are all connected to one side surface of the second plate portion 22 in the thickness direction.

[0170] In the above technical solution, since the plurality of second plate portions 22 are arranged on the same side of the plurality of first plate portions 21 in the second direction Z, not only can the cavity 201 defined by the separator 20 be opened toward the same side, which facilitates the loading of the soft-pack battery cell 11 into the cavity 201 of the separator 20 from the same side of the separator 20, simplifies the assembly process, improves assembly efficiency, and simplifies the structure of the separator 20, facilitating processing and manufacturing. In addition, the arrangement of the plurality of second plate portions 22 on the same side of the plurality of first plate portions 21 is also conducive to improving the overall structural strength of the separator 20 and improving the bending resistance of the separator 20, thereby better protecting the soft-pack battery cell 11.

[0171] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the plurality of second plate portions 22 are arranged on both sides of the plurality of first plate portions 21 in the second direction Z, respectively.

[0172] For example, the second direction Z is the up-down direction of the battery pack 100, and a portion of the plurality of second plate portions 22 may be arranged on the upper side of the plurality of first plate portions 21, and another portion may be arranged on the lower side of the plurality of first plate portions 21. The plurality of second plate portions 22 located on the same side in the second direction Z may be arranged continuously or at intervals.

[0173] Since the multiple second plate portions 22 are respectively located on both sides of the multiple first plate portions 21 in the second direction Z, when the battery pack 100 is subjected to external forces in different directions in the second direction Z, the second plate portions 22 located on both sides in the second direction Z can respectively support the battery pack 100 on both sides of the separator 20 and transmit the dispersed force, thereby balancing the structural strength of the separator 20 on both sides in the second direction Z, and providing a more stable accommodation environment for the soft-pack battery cell 11.

[0174] In addition, multiple second plate portions 22 are respectively arranged on both sides of the first plate portion 21 in the second direction Z, so that the multiple cavities 201 defined by the partition 20 can form openings on both sides in the second direction Z. In this way, the probability of mutual interference between the soft-pack units 10 can be reduced, and the risk of causing thermal runaway of adjacent soft-pack units 10 can be reduced.

[0175] Furthermore, multiple second plate portions 22 are respectively arranged on both sides of the first plate portion 21 in the second direction Z. The battery pack 100 can transfer heat through the second plate portions 22 on both sides, thereby increasing the heat dissipation area and heat dissipation efficiency, reducing the probability of local overheating of the battery pack 100, and making the temperature environment around the multiple soft-pack battery cells 11 more uniform, which is beneficial to improving the temperature uniformity performance of the battery pack 100.

[0176] In the above technical solution, since the multiple second plate portions 22 are respectively arranged on both sides of the multiple first plate portions 21 in the second direction Z, the second plate portions 22 located on both sides in the second direction Z can respectively support the battery pack 100 on both sides of the partition 20, balance the structural strength of the partition 20 on both sides in the second direction Z, and can also enable the partition 20 to define a plurality of cavities 201 that form openings on both sides in the second direction Z, thereby reducing the probability of mutual interference between the soft-pack units 10 and reducing the risk of thermal runaway spread.

[0177] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, two second plate portions 22 adjacent to each other in the first direction X are arranged on both sides of the first plate portion 21 in the second direction Z, respectively.

[0178] That is to say, the multiple second plate portions 22 are alternately arranged on both sides of the multiple first plate portions 21 in the second direction Z, so that the directions of the openings of two adjacent cavities 201 in the first direction X can be set oppositely, thereby improving the isolation effect of adjacent soft-pack units 10. When one of the soft-pack units 10 leaks electrolyte or has thermal runaway, the electrolyte or high-temperature gas will not directly spread to the adjacent cavity 201, reducing the risk of short circuit or thermal runaway in the adjacent soft-pack units 10.

[0179] In the above technical solution, since the two adjacent second plate portions 22 in the first direction X are respectively arranged on both sides of the first plate portion 21 in the second direction Z, the isolation effect of adjacent soft-pack units 10 can be improved, reducing the risk of causing short circuit or thermal runaway of adjacent soft-pack units 10.

[0180] In some embodiments of the present invention, a pressure relief structure is provided on the second plate portion 22 , and the pressure relief structure is configured to connect the cavity 201 with the external space of the partition 20 when the pressure in the cavity 201 is greater than a preset pressure.

[0181] In some examples, the pressure relief structure on the second plate portion 22 may be a pressure relief hole, a pressure relief valve, a pressure relief film or other structures.

[0182] During the operation of the battery pack 100, if the pressure in a certain cavity 201 rises sharply, when the pressure in the cavity reaches a preset pressure, the pressure relief structure can be activated to connect the cavity 201 with the external environment of the battery pack 100 (for example, the exhaust channel of the battery device 1000). In this way, the excessive pressure in the cavity 201 can be released in time, reducing the risk of explosion or rupture of the cavity 201 due to excessive pressure, thereby improving the stability of the battery pack 100.

[0183] In the above technical solution, since the second plate portion 22 is provided with a pressure relief structure, the pressure relief structure can timely release the excessive pressure in the cavity 201, reduce the risk of explosion or rupture due to excessive pressure in the cavity 201, and improve the stability of the battery pack 100.

[0184] In some embodiments of the present invention, the pressure relief structure is a structural weak area on the second plate portion 22 .

[0185] The structural weak area refers to a local specific area on the second plate portion 22, where the strength of the local specific area is lower than that of other areas due to the combined influence of material properties, geometric shape, size or other factors.

[0186] When the battery pack 100 is operating normally, the structurally weak area can maintain structural integrity. However, when subjected to external or internal forces exceeding a certain limit (such as a preset pressure), the structurally weak area deforms, ruptures or fails earlier than other areas of the second plate portion 22, thereby enabling the cavity 201 to communicate with the external space to achieve pressure relief.

[0187] In some examples, the structurally weak area may be made of a material with lower strength than other parts of the second plate portion 22. In some examples, the thickness of the structurally weak area may be thinner than the thickness of other areas of the second plate portion 22. In some embodiments, the structurally weak area may be formed with a weakened hole or a weakened groove.

[0188] In the above technical solution, since the pressure relief structure is a structural weak area on the second plate portion 22, there is no need to additionally set up pressure relief components while achieving pressure relief. This not only reduces the number of components and assembly procedures, simplifies the manufacturing process of the pressure relief structure, and reduces costs, but also reduces occupied space and improves the energy density of the battery pack 100.

[0189] In some embodiments of the present invention, the structurally weak area is formed with notches or etchings.

[0190] Scratching or etching can produce stress concentration in the structural weak area. When the pressure in the cavity 201 increases, the stress will be accumulated preferentially in the part with the scratches or etching, so that the area can be accurately ruptured or deformed under the preset pressure, thereby achieving pressure relief. In this way, the rupture direction of the structural weak area can be guided, the pressure relief area of ​​the structural weak area after rupture can be increased, and the speed and efficiency of pressure relief can be improved.

[0191] It should be noted that by precisely controlling the depth, width and shape of the notch, the strength of the structural weak area can be adjusted, and the pressure threshold of the pressure relief can be flexibly set according to different soft-pack battery cells 11 .

[0192] In the above technical solution, since the structural weak area is formed with notches or etchings, the notches or etchings can guide the rupture direction of the structural weak area, increase the pressure relief area of ​​the structural weak area after rupture, and improve the speed and efficiency of pressure relief.

[0193] In some embodiments of the present invention, the pressure relief structure is formed as a pressure relief hole that penetrates the second plate portion 22 along the thickness direction of the second plate portion 22 .

[0194] It should be noted that by controlling the size and number of the pressure relief holes, the pressure relief threshold can be accurately set, that is, the preset pressure of the pressure relief structure can be accurately set, and since the cross-sectional area of ​​the pressure relief holes is constant, a stable pressure relief rate can be achieved.

[0195] In the above technical solution, since the pressure relief structure is formed as a pressure relief hole that passes through the second plate portion 22, the pressure relief hole has a simple structure, is easy to process, and has stable and reliable pressure relief performance.

[0196] In some embodiments of the present invention, the battery pack 100 further includes: an insulating film, which is disposed on the second plate portion 22 and completely covers the pressure relief hole.

[0197] The insulating film of this embodiment covers the pressure relief hole, which can reduce the probability of the electrolyte inside the soft-pack battery cell 11 contacting the conductive components outside the battery pack 100 through the pressure relief hole, and reduce the probability of short circuit between the soft-pack battery cell 11 and the external conductive components. The insulating film can also prevent external impurities or foreign matter from entering the battery pack 100, so that the soft-pack battery cell 11 can operate in a safe environment, thereby improving the reliability of the battery pack 100 during operation.

[0198] In the above technical solution, since the pressure relief hole is covered with an insulating film, the insulating film can maintain a stable environment inside the battery pack 100 , reduce the probability of short circuit between the soft-pack battery cell 11 and external conductive components, and improve the reliability and durability of the battery pack 100 .

[0199] In some embodiments of the present invention, the thickness of the insulating film is greater than or equal to 0.03 mm and less than or equal to 0.3 mm.

[0200] For example, the thickness of the insulating film may be 0.03 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.228 mm, or 0.3 mm, etc.

[0201] It should be noted that when the insulating film is too thin, for example, when the thickness of the insulating film is less than 0.03 mm, the strength of the insulating film is low and it is easy to break when subjected to a small external force. In addition, the insulating performance of a too thin insulating film is not high and it is easy to be broken down by the high voltage inside the battery pack 100. When the insulating film is too thick, for example, when the thickness of the insulating film is greater than 0.3 mm, the toughness of the insulating film is poor and it is easy to crack when subjected to complex external forces such as bending or stretching. In addition, the amount of material used for a too thick insulating film increases, and the cost is higher.

[0202] In the above technical solution, the thickness of the insulating film is set between 0.03 mm and 0.3 mm, which can improve the insulation performance of the insulating film and reduce the probability of high voltage inside the battery pack 100 breaking through the insulating film. It can also improve the toughness of the insulating film and reduce the probability of the insulating film breaking when subjected to external forces. In addition, the material cost of the insulating film can also be reduced.

[0203] In some embodiments of the present invention, the thickness of the insulating film is greater than or equal to 0.1 mm and less than or equal to 0.2 mm.

[0204] For example, the thickness of the insulating film may be 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, or the like.

[0205] In the above technical scheme, since the thickness of the insulating film is greater than or equal to 0.1 mm and less than or equal to 0.2 mm, the toughness of the insulating film can be further improved while ensuring the insulating performance of the insulating film, thereby reducing the probability of the insulating film breaking when subjected to external forces, and further reducing the material cost of the insulating film.

[0206] In some embodiments of the present invention, the thickness of the plate material of the separator 20 is greater than or equal to 0.4 mm and less than or equal to 1 mm.

[0207] For example, the thickness of the plate material of the separator 20 can be 0.42 mm, 0.45 mm, 0.47 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm or 1 mm, etc.

[0208] It should be noted that when the thickness of the partition is too thin, for example, when the thickness of the partition is less than 0.4 mm, the strength of the partition is insufficient to provide stable support for the soft-pack battery cell 11. When the thickness of the partition is too thick, for example, when the thickness of the partition is greater than 1 mm, the weight of the battery pack 100 will increase, the energy density of the battery pack 100 will be reduced, and the cost will be increased.

[0209] In the above technical solution, since the thickness of the plate of the separator 20 is greater than or equal to 0.4 mm and less than or equal to 1 mm, it can provide sufficient support for the soft-pack battery cell 11 and effectively protect the soft-pack battery cell 11, while reducing the cost of the battery pack 100 and improving the energy density of the battery pack 100.

[0210] In some embodiments of the present invention, the thickness of the first plate portion 21 is greater than the thickness of the second plate portion 22 .

[0211] For example, the first plate portion 21 is a flat plate perpendicular to the first direction X, and the thickness of the first plate portion 21 can be 0.42mm, 0.45mm, 0.47mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm, etc.

[0212] For example, the second plate portion 22 is a flat plate arranged perpendicular to the second direction Z, and the thickness of the second plate portion 22 can be 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm or 0.95mm, etc.

[0213] The first plate portion 21 is a partial structure of the partition 20 separating the two soft-pack units 10. The thickness of the first plate portion 21 is set to be greater than the thickness of the second plate portion 22, which can further improve the structural strength of the first plate portion 21, improve the structural strength of the partition 20, and enhance the supporting effect and separation effect on the soft-pack unit 10.

[0214] The second plate portion 22 is arranged on one side of the soft-pack unit 10 in the second direction Z. Since a pressure relief structure can be provided on the second plate portion 22, setting the thickness of the second plate portion 22 to be smaller than the thickness of the first plate portion 21 can be beneficial to the arrangement of the pressure relief structure, and to pressure relief from one side of the soft-pack unit 10 in the second direction Z, and can reduce costs.

[0215] In the above technical solution, the thickness of the first plate portion 21 is larger, which can improve the structural strength of the first plate portion 21, improve the structural strength of the partition 20, and enhance the supporting effect and separation effect of the soft-pack unit 10. The thickness of the second plate portion 22 is smaller, which can facilitate the arrangement of the pressure relief structure on the second plate portion 22 to achieve pressure relief from one side of the soft-pack unit 10 in the second direction Z, thereby reducing the material cost of the second plate portion 22.

[0216] In some embodiments of the present invention, the first plate portion 21 and the second plate portion 22 are connected by welding, clamping or integrally formed.

[0217] The first plate portion 21 is connected to the second plate portion 22 by welding. The first plate portion 21 and the second plate portion 22 can be formed separately to reduce the difficulty of processing. The welding connection can improve the connection strength between the first plate portion 21 and the second plate portion 22, improve the structural strength of the separator 20, and improve the sealing performance of the connection position between the first plate portion 21 and the second plate portion 22.

[0218] The first plate portion 21 and the second plate portion 22 are connected by snapping, and the snapping connection is simple to operate and convenient for disassembly, assembly and maintenance, which can improve the assembly efficiency of the separator 20 and reduce the maintenance cost of the battery pack 100 .

[0219] The first plate portion 21 and the second plate portion 22 are integrally formed, which can enhance the integrity between the first plate portion 21 and the second plate portion 22, improve the connection reliability between the first plate portion 21 and the second plate portion 22, and the separator 20 does not need to be assembled, which can also improve the assembly efficiency of the battery pack 100. In addition, the separator 20 is integrally formed, which can also improve the sealing performance of the cavity 201.

[0220] In the above technical solution, the first plate portion 21 and the second plate portion 22 are welded or integrally formed, which can improve the connection reliability between the first plate portion 21 and the second plate portion 22 and enhance the sealing performance of the cavity 201. The first plate portion 21 and the second plate portion 22 are snap-connected, which can facilitate disassembly and maintenance, thereby reducing the maintenance cost of the battery pack 100.

[0221] In some embodiments of the present invention, a heat exchange channel is formed in the first plate portion 21 .

[0222] The heat exchange channel is used to allow a heat exchange medium to pass through, and the heat exchange medium can exchange heat with the soft-pack battery cell 11 through the first plate portion 21 .

[0223] Specifically, when the soft-pack battery cell 11 generates heat during operation, a heat exchange medium can be introduced into the heat exchange channel, and the heat can be quickly transferred from the first plate portion 21 to the heat exchange medium in the heat exchange channel. As a result, the heat conduction path between the soft-pack battery cell 11 and the heat exchange medium is short, which can improve the heat exchange efficiency, reduce the probability of heat accumulation inside the soft-pack unit 10, effectively reduce the operating temperature of the battery pack 100, keep the soft-pack battery cell 11 in a suitable temperature range, and improve the performance and service life of the battery pack 100.

[0224] In some examples, the heat exchange flow channel in the first plate portion 21 can extend along a straight line, a curve, or a circuitous path, thereby increasing the contact area between the heat exchange medium and the first plate portion 21, further improving the heat exchange efficiency, and reducing the probability of local overheating in the battery pack 100.

[0225] In addition, there are multiple first plate parts 21, and heat exchange channels can be arranged on each first plate part 21, or heat exchange channels can be formed only on a part of the first plate parts 21. The heat exchange channels of multiple first plate parts 21 can be connected in parallel and / or in parallel.

[0226] Furthermore, the flow rate and temperature of the heat exchange medium in each heat exchange channel are adjustable, so that the temperature of the soft pack unit 10 in different areas of the battery pack 100 can be accurately adjusted and precisely controlled, thereby improving the temperature uniformity in the battery pack 100.

[0227] In addition, when a heat exchange channel is formed on the first plate portion 21 , the separator 20 can be integrated with the heat exchange component of the battery device 1000 , thereby reducing the number of components, reducing space occupation, and improving the energy density of the battery device 1000 .

[0228] In the above technical solution, since a heat exchange channel is formed in the first plate portion 21, the heat exchange channel is used to pass a heat exchange medium. The heat exchange medium can contact and exchange heat with the soft-pack unit 10 through the first plate portion 21, thereby reducing the probability of heat accumulation inside the soft-pack unit 10, so that the soft-pack battery cell 11 is in a suitable temperature range, thereby improving the performance and service life of the battery pack 100.

[0229] In some embodiments of the present invention, the separator 20 is a metal member.

[0230] The metal separator 20 has a stable structure and high strength, which can reduce the probability of deformation of the cavity 201 where the soft-pack battery cell 11 is located, effectively protect the soft-pack battery cell 11, and improve the stability and service life of the battery pack 100.

[0231] The separator 20 is a metal piece, which can further improve the thermal conductivity of the separator 20. The heat generated by the soft-pack battery cell 11 can be transferred to the thermal management system of the battery device 1000 through the separator 20, thereby improving the thermal management efficiency of the thermal management system for the battery pack 100.

[0232] In the above technical solution, since the separator 20 is a metal part, the probability of deformation of the cavity 201 where the soft-pack battery cell 11 is located can be reduced, thereby improving the stability and service life of the battery pack 100. The thermal conductivity of the separator 20 can also be further improved, thereby improving the thermal management efficiency of the thermal management system for the battery pack 100.

[0233] In some embodiments of the present invention, the separator 20 is made of aluminum, aluminum alloy, stainless steel or nickel.

[0234] The separator 20 is made of aluminum or aluminum alloy, which can reduce the weight of the separator 20 and increase the energy density of the battery pack 100 . It can also improve the thermal conductivity of the separator 20 and the heat dissipation effect of the soft-pack battery cell 11 .

[0235] The separator 20 is made of stainless steel, which can improve the structural strength, deformation resistance and corrosion resistance of the separator 20 , thereby improving the separation and protection effect of the soft-pack battery cells 11 and improving the reliability and service life of the battery pack 100 .

[0236] The separator 20 is made of nickel, which can improve the corrosion resistance and high temperature resistance of the separator 20 and enhance the reliability and service life of the battery pack 100 .

[0237] The present invention is not limited thereto, and the separator 20 may also be made of copper, tungsten or zinc.

[0238] In the above technical solution, the separator 20 is made of aluminum or aluminum alloy, which can reduce the weight of the separator 20 and improve the energy density of the battery pack 100. The separator 20 is made of stainless steel or nickel, which can improve the structural strength and corrosion resistance of the separator 20 and improve the reliability and service life of the battery pack 100.

[0239] In some embodiments of the present invention, the soft-pack battery cell 11 is any one of a lithium iron phosphate battery cell, a ternary battery cell, and a solid-state battery cell.

[0240] In this embodiment, the soft-pack battery cell 11 is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell. The lithium iron phosphate battery cell has the advantages of high reliability, long cycle life, good high temperature performance, etc. The ternary battery cell has the advantages of high energy density, fast charging, etc. The solid-state battery cell has the advantages of high reliability, high energy density, long cycle life, etc. For example, the solid-state battery cell can be a sulfide solid-state battery, an oxide solid-state battery or a polymer solid-state battery, a composite solid-state electrolyte battery, a garnet solid-state battery, etc.

[0241] In the above technical solution, the soft-pack battery cell 11 is set to be any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell, so that the soft-pack battery cell 11 can be flexibly set to different types of battery cells as needed, thereby making the application scenarios of the soft-pack battery cell 11 wider, so that the battery device 1000 can better meet different usage requirements.

[0242] In some embodiments of the present invention, the soft-pack battery cell 11 is a lithium iron phosphate battery cell, and in the positive electrode material of the soft-pack battery cell 11, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96:1-3:1-3; the soft-pack battery cell 11 is a ternary battery cell, and in the positive electrode material of the soft-pack battery cell 11, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96:2-3:1-2.

[0243] In some embodiments, the positive electrode of the soft-pack battery cell 11 may be a positive electrode sheet, which may include a positive electrode collector and a positive electrode film layer disposed on at least one surface of the positive electrode collector, wherein the positive electrode film layer includes a positive electrode active material.

[0244] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0245] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, silver surface treated aluminum or stainless steel, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0246] As an example, when the soft-pack battery cell 11 of the embodiment of the utility model is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the soft-pack battery cell 11. However, the utility model is not limited to these materials, and other traditional materials that can be used as battery positive electrode film layers can also be used. These positive electrode active materials can be used alone or in combination of two or more.

[0247] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0248] The layered transition metal oxide includes at least one of a compound of the general formula LiaNibCocMdOeAf and a modified compound thereof. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B, and A includes at least one of N, F, S and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0249] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5 At least one of Co0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), LiNi0.9Co0.05Mn0.05O2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi0.80Co0.15Al0.05O2) and its modified compounds.

[0250] When the soft-pack battery cell 11 of the embodiment of the utility model is a sodium ion battery, the positive electrode active material may include but is not limited to at least one of sodium-containing transition metal oxides, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0251] As an example, the positive active material for a sodium ion battery may include at least one of NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, NaNi1 / 2Ti1 / 2O2, NaNi1 / 2Mn1 / 2O2, Na2 / 3Fe1 / 3Mn2 / 3O2, NaNi1 / 3Co1 / 3Mn1 / 3O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue-based materials, and materials of the general formula XpM'q(PO4)rOxY3-x. In the general formula XpM'q(PO4)rOxY3-x, 0<p≤4, 0<q≤2, 1≤r≤3, 0≤x≤2, X includes at least one of H+, Li+, Na+, K+ and NH4+, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halogen anion, optionally at least one of F, Cl and Br.

[0252] In the embodiment of the utility model, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0253] The soft-pack battery cell 11 is accompanied by the deintercalation and consumption of active ions such as Li during the charge and discharge process. The molar content of Li in the soft-pack battery cell is different when it is discharged to different states. In the examples of the positive electrode active materials in the embodiments of the present invention, the molar content of Li is the initial state of the material, that is, the state before feeding. The positive electrode active material is used in the battery system, and the molar content of Li may change after charge and discharge cycles.

[0254] In the examples of the present invention, the molar content of oxygen in the positive electrode active materials is only a theoretical value. The release of oxygen from the lattice will cause the molar content of oxygen to change. In reality, the molar content of oxygen will fluctuate.

[0255] In the embodiment of the utility model, the content of the elements in the positive electrode active material has a well-known meaning in the art, and can be detected by equipment and methods well-known in the art, for example, with reference to EPA 6010D-2014, tested by inductively coupled plasma atomic emission spectrometry, and measured by plasma atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, weigh 0.4 g of the positive electrode active material and add 10 ml (50% concentration) of aqua regia thereto. Then place it on a plate at 180°C for 30 minutes. After digestion on the plate, dilute to a volume of 100 mL, and use the standard curve method for quantitative testing.

[0256] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam, etc. When the foamed metal is used as the positive electrode, the positive electrode film layer may not be provided on the surface of the foamed metal, but of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0257] In some embodiments, the positive electrode film layer may further include a positive electrode conductive agent. The present utility model embodiment has no particular restrictions on the type of positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0258] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The present utility model embodiment has no particular restrictions on the type of positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0259] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector, drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder and any other components in a solvent and stirring them evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0260] In some embodiments, the negative electrode of the soft-pack battery cell may be a negative electrode plate, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0261] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0262] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy or foamed carbon, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0263] As an example, the negative electrode active material may adopt the negative electrode active material for soft-pack battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, the utility model is not limited to these materials, and other traditional materials that can be used as battery negative electrode film layers can also be used. These negative electrode film layers can be used alone or in combination of two or more.

[0264] In some embodiments, the negative electrode active material includes silicon, which may be present in the form of a silicon-based material, for example, the silicon-based material may include at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon compounds, silicon-nitrogen compounds, and silicon alloys. The introduction of silicon can improve the energy density of the soft-pack battery cell.

[0265] In some embodiments, the mass content of silicon in the negative electrode film layer is 1wt% to 32wt%, optionally 2wt% to 19wt%, and further optionally 6wt% to 13wt%. In a soft-pack battery monomer system, when the mass content of silicon is within the above range, the energy density of the soft-pack battery monomer can be improved.

[0266] In the embodiments of the present utility model, the mass content of silicon in the negative electrode film layer has a well-known meaning in the art, and can be detected by using equipment and methods well-known in the art, such as immersing the negative electrode plate in a solvent such as water, separating the negative electrode active material from the negative electrode current collector, filtering to obtain the negative electrode active material, and measuring the negative electrode active material using an ICAP7400 inductively coupled plasma-emission spectrometer of Thermo Fisher Scientific, USA, with reference to GB / T30902-2014 standard to obtain the silicon content.

[0267] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The utility model embodiment has no particular restrictions on the type of negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5wt%.

[0268] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The present utility model embodiment has no particular restrictions on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA) and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0269] In some embodiments, the negative electrode film layer may further include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of the other additives in the negative electrode film layer is ≤ 2wt%.

[0270] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0271] In some embodiments, the isolation element includes an isolation membrane. The utility model has no particular limitation on the type of the isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0272] The embodiment of the utility model has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0273] In some embodiments, the material of the isolation membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0274] In some embodiments, the isolation membrane may include a porous base membrane and a coating layer disposed on at least one side of the porous base membrane, and the coating layer may include at least one of inorganic particles or organic particles.

[0275] The porous base membrane may include one or more of polyethylene and polypropylene.

[0276] The inorganic particles have good heat resistance and can improve the heat resistance of the separator as a whole. The inorganic particles will not undergo oxidation and reduction reactions with metal dendrites within the operating voltage range of the sodium ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium ion battery.

[0277] 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.

[0278] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0279] In some embodiments, the soft-pack battery cell 11 further includes an electrolyte.

[0280] During the charge and discharge process of the battery cell, active ions are embedded and released back and forth between the positive electrode and the negative electrode, and the electrolyte plays a role in conducting active ions between the positive electrode and the negative electrode. The embodiment of the utility model has no particular restriction on the type of electrolyte, which can be selected according to actual needs.

[0281] The electrolyte includes electrolyte salt and solvent. The types of electrolyte salt and solvent are not specifically limited and can be selected according to actual needs.

[0282] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high temperature performance, and additives that improve battery low temperature power performance.

[0283] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0284] In some embodiments, when the soft-pack battery cell 11 is set as a lithium iron phosphate battery cell, the usage ratio of the positive electrode active material, the binder, and the conductive agent in the positive electrode material of the soft-pack battery cell 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.

[0285] Furthermore, the positive electrode active material is lithium iron phosphate, the binder is polyvinylidene fluoride, the conductive agent is conductive graphite, and the usage ratio of the positive electrode active material, the binder and the conductive agent can be 96:2:2.

[0286] In some embodiments, when the soft-pack battery cell 11 is a ternary battery cell, the usage ratio of the positive electrode active material, the binder, and the conductive agent in the positive electrode material of the soft-pack battery cell 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, and the like.

[0287] Furthermore, the ternary battery cell may be eight-series lithium nickel-chromium-manganese oxide LiNi0.8Co0.1Mn0.1O2, wherein the usage ratio of the positive electrode active material, the binder, and the conductive agent may be 96:2.5:1.5.

[0288] In the above technical solution, the soft-pack battery cell 11 is set as a lithium iron phosphate battery cell, and the usage ratio of the active material, the binder, and the conductive agent is 96:1-3:1-3, or the soft-pack battery cell 11 is set as a ternary battery cell, and the usage ratio of the positive electrode active material, the binder, and the conductive agent in the positive electrode material of the soft-pack battery cell 11 is 96:2-3:1-2, so that the soft-pack battery cell 11 can have a higher energy density, better electrode structure stability and reliability, and greatly reduce the probability of active material falling off or stratification during charging and discharging, so that the soft-pack battery cell 11 has a longer cycle life, and the resistance inside the electrode is reduced, so that the soft-pack battery cell 11 can have better charging and discharging efficiency and power density.

[0289] In some embodiments of the present invention, the soft-pack battery cell 11 is a ternary battery cell, and a pressure relief zone is provided on the separator 20, which is configured to connect the inner space of the separator 20 with the outer space of the separator 20 when preset conditions are met.

[0290] The separator 20 may be provided with one pressure relief zone, or may be provided with multiple pressure relief zones. The multiple pressure relief zones may correspond one-to-one to the multiple soft-pack units 10 , and each pressure relief zone is used to relieve pressure for the corresponding soft-pack unit 10 .

[0291] In some examples, the preset conditions may include at least one of the following conditions: the pressure inside the partition 20 is greater than a pressure threshold; the pressure change rate inside the partition 20 is greater than a preset change rate threshold; the temperature inside the partition 20 is greater than a temperature threshold; abnormal gas is generated inside the partition 20; the concentration of harmful gas inside the partition 20 is greater than a preset concentration threshold, etc.

[0292] For example, during the operation of the battery pack 100, if the pressure inside the battery pack 100 rises sharply and reaches a preset pressure threshold, the pressure relief zone connects the inner and outer spaces of the partition 20. Thus, the excessive pressure inside the partition 20 can be released in time, reducing the risk of explosion or rupture of the battery pack 100 due to excessive pressure, thereby improving the stability of the battery pack 100.

[0293] In the above technical solution, since a pressure relief zone is provided on the separator 20 , the pressure relief zone can timely release the high-temperature and high-pressure gas in the separator 20 , thereby reducing the risk of explosion or rupture due to excessive pressure in the cavity 201 and improving the stability of the battery pack 100 .

[0294] In some embodiments of the present invention, a through hole penetrating the partition 20 is formed in the pressure relief area.

[0295] It should be noted that the through holes connect the inner and outer spaces of the partition 20. By controlling the size and number of the through holes in the pressure relief zone, the pressure relief threshold can be accurately set. Since the total cross-sectional area of ​​the through holes in the pressure relief zone is constant, a stable pressure relief rate can be guaranteed.

[0296] In the above technical solution, since the pressure relief area is formed as a through hole that penetrates the partition 20, the through hole has a simple structure, is easy to process, and has a stable and reliable pressure relief performance.

[0297] In some embodiments of the present invention, the pressure relief area is a structurally weakened area of ​​the separator 20 , and the structurally weakened area is provided with notches or etchings.

[0298] The structurally weakened area refers to a local specific area on the separator 20 whose structural strength is lower than that of other areas. The local specific area is the structurally weakened area of ​​the separator 20 .

[0299] When the battery pack 100 is operating normally, the structurally weakened area can maintain the structural integrity of the partition 20. However, when subjected to external or internal forces exceeding a certain limit (such as a preset pressure), the structurally weakened area deforms, ruptures or fails earlier than other areas of the partition 20, thereby connecting the inner and outer spaces of the partition 20 to achieve pressure relief.

[0300] In some examples, the structurally weakened area may be made of a material with lower strength than other parts of the second plate portion 22. In some examples, the thickness of the structurally weakened area may be thinner than the thickness of other areas of the second plate portion 22. In some embodiments, the structurally weakened area may be formed with a weakened hole or a weakened groove.

[0301] In some examples, the structurally weakened area is formed with notches or etchings. Specifically, the notches or etchings in the structurally weakened area can cause stress concentration in the structurally weakened area. When the pressure in the separator 20 increases, the stress will preferentially accumulate in the notched or etched portion, so that the area can be accurately ruptured or deformed under a preset pressure, thereby achieving pressure relief. As a result, the rupture direction of the structurally weakened area can be guided, the pressure relief area of ​​the structurally weakened area after rupture is increased, and the speed and efficiency of pressure relief are improved.

[0302] It should be noted that by precisely controlling the depth, width and shape of the notch, the strength of the structural weakened area can be adjusted, and the pressure threshold of the pressure relief can be flexibly set according to different requirements of the battery pack 100 .

[0303] In the above technical solution, since the pressure relief zone is the structurally weakened zone of the separator 20, and the structurally weakened zone is formed with notches or etching, the number of parts and assembly procedures can be reduced, the manufacturing process of the pressure relief zone can be simplified, and the cost can be reduced under the premise of achieving pressure relief. In addition, notches or etching can guide the rupture direction of the structurally weakened zone, increase the pressure relief area of ​​the structurally weakened zone after rupture, and improve the speed and efficiency of pressure relief.

[0304] In some embodiments of the present invention, the soft-pack battery cell 11 includes a membrane shell, and a structural weak portion is provided on the membrane shell.

[0305] The structural weak part refers to: the structural strength of a certain area of ​​the membrane shell is lower than the structural strength of other areas of the membrane shell, and this area is the structural weak part of the membrane shell. When the soft-pack battery cell 11 works normally, the structural weak part of the membrane shell can maintain integrity, but when the membrane shell is subjected to external or internal forces exceeding a certain limit (such as a preset pressure), the structural weak part deforms, ruptures or fails earlier than other areas of the membrane shell, thereby connecting the interior of the membrane shell with the external space of the membrane shell to achieve pressure relief in the membrane shell.

[0306] In some examples, the thickness of the structurally weak portion of the membrane shell may be thinner than the thickness of other regions of the membrane shell. In some embodiments, the structurally weak portion of the membrane shell may be formed with structures such as weakened holes or weakened grooves.

[0307] In the above technical solution, since a structural weak portion is formed on the membrane shell, when the pressure inside the membrane shell is too high, the structural weak portion can be destroyed to timely release the excessive pressure inside the membrane shell, reduce the risk of explosion or rupture due to excessive pressure inside the membrane shell, and improve the stability of the battery pack 100. The structure of the structural weak portion is simple and does not require additional space, so the energy density of the soft-pack battery cell 11 can be improved.

[0308] In some embodiments of the utility model, the partition 20 includes a first shell wall and two second shell walls, the first shell wall extends along a first direction, the two second shell walls are respectively connected to the two ends of the second shell wall in the first direction, and extend away from the first shell wall along the second direction, the first direction intersects with the second direction, the first shell wall and the two second shell walls cooperate to define a receiving cavity, and the ends of the two second shell walls away from the first shell wall cooperate to define an open opening connected to the receiving cavity, and the soft package unit 10 is arranged in the receiving cavity.

[0309] In some examples, there may be a plurality of separators 20 , and the plurality of separators 20 may be arranged in sequence along the first direction. The plurality of separators 20 corresponds to the plurality of soft-pack units 10 one by one.

[0310] In some examples, a pressure relief zone is provided on at least one side of the separator 20 in the second direction. In other words, a pressure relief zone is provided on at least one of the second shell walls, and a structural weak portion is provided on the soft-pack battery cell 11, which is opposite to the pressure relief zone. When thermal runaway occurs in the soft-pack battery cell 11, high-temperature gas can be released from the pressure relief zone on the separator 20.

[0311] In this embodiment, the separator 20 is configured to include a first shell wall and two second shell walls. The separator 20 as a whole can be a U-shaped shell, thereby allowing the soft-pack battery cell 11 to be relatively easily introduced or removed from the open opening. During the assembly process of the battery device, the assembly can be made simpler and faster, and when the soft-pack battery cell 11 needs to be maintained, repaired or replaced, the soft-pack battery cell 11 can also be more conveniently removed from the U-shaped shell.

[0312] In addition, the U-shaped partition can better fit the shape of the soft-pack battery cell 11. The soft-pack battery cell 11 is usually flat. The U-shaped partition 20 can tightly surround most of the surface of the soft-pack battery cell 11. The two second shell walls can replace the partition for support. While ensuring good protection for the soft-pack battery cell 11, it can also effectively reduce the number of components in the box and improve the energy density of the battery device.

[0313] In the above technical solution, the partition is set in a U shape, which can facilitate the assembly of the soft-pack unit 10, improve assembly efficiency, reduce costs, and facilitate later maintenance, reducing maintenance costs. It can also better restrain multiple soft-pack battery cells 11 while reducing the additional support partitions of the soft-pack battery cells 11, thereby improving the energy density of the battery device.

[0314] In some embodiments of the present invention, multiple soft-pack units 10 are arranged in sequence along a first direction X, and the battery pack 100 further includes: a busbar, which is arranged on both sides of the multiple soft-pack units 10 in a third direction Y, and the busbar is electrically connected to the soft-pack units 10, and the first direction X intersects with the third direction Y.

[0315] This embodiment can conveniently realize electrical connection with each soft-pack unit 10 by arranging the current collector on both sides of the plurality of soft-pack units 10 in the third direction Y, collect the current generated or required by each soft-pack unit 10, make the current transmission path more regular and centralized, and help improve the efficiency of the current output or input of the entire battery pack 100, so that the battery pack 100 can stably supply power to the outside or receive charging. At the same time, the current collector is arranged on both sides of the third direction Y, and the current collector can reasonably utilize the space structure formed by the arrangement of the soft-pack units 10, without occupying the arrangement space of the soft-pack units 10 in the first direction X, and optimize the space configuration inside the battery pack 100.

[0316] In some implementations, the embodiment arranges multiple soft-pack units 10 along the first direction X, the pressure relief area on the separator 20 can be set on both sides of the multiple soft-pack units 10 in the second direction Z, and the busbar is arranged on both sides of the multiple soft-pack units 10 in the third direction Y. In this way, the multiple soft-pack units 10 can be compactly arranged in the first direction X, so that the structure of the battery pack 100 is compact, the space utilization rate is improved, and the energy density is improved. In addition, since the pressure relief area and the busbar of the battery pack 100 can be arranged on different sides of the battery pack 100, when an electrical fault occurs in the busbar (such as short circuit to generate electric sparks, overheating, etc.), the risk of causing abnormal pressure relief in the pressure relief area or damaging the pressure relief structure can be reduced. Similarly, when the internal pressure of the battery pack 100 is too high and needs to be relieved through the pressure relief area, the probability of the pressure relief process affecting the busbar can be reduced, the electrical connection stability of the busbar during the pressure relief process can be improved, and the reliability of the battery pack 100 can be improved. It can also reduce the probability of the electrolyte contacting the busbar during pressure relief, reducing the risk of corrosion and short circuit of the busbar.

[0317] In some embodiments, the busbar may extend in a long strip shape along the first direction X to achieve connection with multiple soft package units 10. Furthermore, the busbar may be made of copper, aluminum, copper-aluminum composite, or nickel, etc., to improve the conductivity, heat dissipation, and corrosion resistance of the busbar.

[0318] In some embodiments, the soft-pack battery cell 11 includes a film shell and an electrode assembly, and the electrode assembly includes an electrode body and tabs provided at both ends of the electrode body in the third direction Y, wherein one end of the tab in the third direction Y is connected to the electrode body and the other end extends out of the film shell. Further, the busbar is connected to the tab, wherein the busbar can be directly connected to the tab, for example, the busbar can be directly welded to the tab, or the busbar can be connected to the tab via a conductive member, for example, the conductive member can be welded to the busbar and the tab, respectively.

[0319] In the above technical solution, since multiple soft-pack units 10 are arranged in sequence along the first direction X, the busbar is electrically connected to the soft-pack unit 10 and is arranged on both sides of the soft-pack unit 10 in the third direction Y, the busbar can be conveniently electrically connected to the multiple soft-pack units 10, thereby improving the efficiency of current output or input of the battery pack 100, so that the battery pack 100 can stably supply power to the outside or receive charging. At the same time, the busbar can reasonably utilize the spatial structure formed by the arrangement of the soft-pack units 10 without occupying the arrangement space of the soft-pack units 10 in the first direction X, thereby optimizing the internal space configuration of the battery pack 100 and improving the energy density of the battery pack 100.

[0320] In some embodiments of the present invention, the battery pack 100 further includes: two poles, which are respectively connected to the busbars on both sides of the soft-pack unit 10 in the third direction Y, wherein the poles are arranged on both sides of the partition 20 in the third direction Y, or the poles are arranged on one side of the partition 20 in the second direction Z, and the second direction Z intersects both the first direction X and the third direction Y.

[0321] The two poles of the battery pack 100 are respectively a positive pole and a negative pole, and the poles are connected to the busbar, which can realize the centralized extraction or introduction of the current generated by multiple soft-pack units 10 during discharge or the current required during charging, thereby facilitating the electrical connection between the battery pack 100 and the external circuit.

[0322] In some specific embodiments, the positive pole and the negative pole are respectively arranged on both sides of the separator 20 in the third direction Y, so that the distance between the positive pole and the negative pole can be increased, the interference between the positive pole and the negative pole can be reduced, and the spacing between the busbar and the corresponding pole can be reduced, which facilitates the direct connection of the busbar with the pole and improves the assembly efficiency. At the same time, the pole and the busbar are concentrated on the same side of the separator 20, which can be compacted and reduce the space occupied by the pole in other directions.

[0323] In some specific embodiments, the positive electrode column and the negative electrode column are arranged on the same side of the separator 20 in the second direction Z, thereby facilitating the centralized connection of the battery pack 100 with the external circuit on the same side in the second direction Z, improving the assembly efficiency, and facilitating the maintenance of the battery pack 100. At the same time, the electrode column does not need to occupy the additional space of the battery pack 100 in the third direction Y, thereby making the structure of the battery pack 100 in the third direction Y compact. Furthermore, the electrode column and the busbar are arranged on different sides of the separator 20, respectively, so that the space on different sides of the separator 20 in different directions can be comprehensively utilized, thereby improving the utilization rate of the space around the separator 20, making the structure of the battery pack 100 compact, and improving the energy density of the battery pack 100.

[0324] In the above technical scheme, the poles are arranged on both sides of the partition 20 in the third direction Y, so that the poles and the busbars can be concentrated on the same side of the partition 20, which is convenient for the busbars to be directly connected to the poles and has a compact structure; the poles are arranged on one side of the partition 20 in the second direction Z, so that the poles and the busbars can be arranged on different sides of the partition 20 respectively, and the space on different sides of the partition 20 in different directions is comprehensively utilized, thereby improving the utilization rate of the space around the partition 20 and improving the energy density of the battery pack 100.

[0325] In a second aspect, an embodiment of the utility model further provides a battery device 1000 , comprising: a box body 400 and a battery pack 100 according to any one of the above embodiments, wherein the box body 400 has a receiving cavity 401 ; and the battery pack 100 is disposed in the receiving cavity 401 .

[0326] In some embodiments, the box body 400 includes a box body 410 and a cover plate 420, the box body 410 defines a top-open accommodating cavity 401, the cover plate 420 is disposed on the upper side of the box body 410, and is used to cover the open side of the accommodating cavity 401, and the cover plate 420 and the box body 410 are detachably connected by fasteners. Further, a sealing member is provided between the box body 410 and the cover plate 420, and the sealing member extends in a ring shape along the circumference of the cover plate 420, and the sealing member is sealed and abutted between the cover plate 420 and the box body 410 to seal the gap between the cover plate 420 and the box body 410.

[0327] The number of battery packs 100 in the battery device 1000 may be one or more. When there are more than one battery packs 100, the battery packs 100 may be arranged along the first direction X, the second direction Z, or the third direction Y.

[0328] In some embodiments, the battery pack 100 is fixedly connected to the box body 400. For example, the battery pack 100 and the inner wall of the box body 400 may be connected by fasteners, or the battery pack 100 and the box body 400 may be connected by bonding.

[0329] In the above technical solution, since the electric device 1 is provided with the above-mentioned battery pack 100, and since the separator 20 of the battery pack 100 separates the multiple soft-pack battery cells 11 into multiple soft-pack units 10, and each soft-pack unit 10 is connected to the separator 20, the separator 20 can not only play a role of separation and isolation between two adjacent soft-pack units 10, reduce the probability of thermal runaway gas propagating to the location of the adjacent soft-pack unit 10, reduce the risk of causing thermal runaway of the adjacent soft-pack unit 10, but also reduce the contact, extrusion and friction between the soft-pack battery cells 11 of the adjacent soft-pack units 10. The probability of short circuit between the soft-pack battery cells 11 of adjacent soft-pack units 10 is reduced; and the separator 20 can also reduce the range of movement and deformation of the soft-pack battery cells 11 in each soft-pack unit 10, improve the stability of the position of the soft-pack unit 10 in the battery pack 100, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells 11; in addition, the separator 20 can also disperse external impact force, reduce the probability of a single soft-pack battery cell 11 being subjected to excessive impact force, and increase the service life of the soft-pack battery cell 11, thereby increasing the service life of the battery device 1000.

[0330] In some embodiments of the present invention, an exhaust passage is provided in the box body 400, and a pressure relief structure is provided on the partition 20, and the pressure relief structure is communicated with the exhaust passage.

[0331] In some embodiments, a pressure relief device may be provided on the box body 400, the inlet end of the exhaust channel is connected to the pressure relief structure of the partition 20, and the outlet section of the exhaust channel may be connected to the pressure relief device on the box body 400, wherein the pressure relief device is configured to connect the exhaust channel with the external space of the box body.

[0332] For example, when the soft-pack unit 10 in the battery pack 100 experiences thermal runaway, the high-temperature gas generated by the soft-pack unit 10 can enter the exhaust channel of the box body 400 through the pressure relief structure on the partition 20, and then be discharged to the outside of the box body 400 through the pressure relief device provided on the box body 400. In this way, the pressure inside the box body 400 can be kept stable, reducing the probability of explosion of the battery device 1000 due to the continuous increase in the pressure inside the box body 400.

[0333] In the above technical solution, an exhaust channel is provided in the box body 400, and the pressure relief structure on the partition 20 is connected to the exhaust channel. When thermal runaway occurs in the soft pack unit 10, the thermal runaway gas and heat can be discharged from the box body 400 in time through the exhaust channel, thereby maintaining the pressure in the box body 400 stable and reducing the probability of explosion of the battery device 1000 due to the continuous increase in pressure in the box body 400.

[0334] In some embodiments of the present invention, the battery device 1000 further includes: a heat exchanger, which is arranged in the accommodating cavity 401 and located between the battery pack 100 and the inner wall of the box body 400 , and is used for heat exchange with the soft-pack battery cell 11 .

[0335] In some examples, the heat exchange element can be arranged between the side wall of the box body 400 and the battery pack 100, or between the top wall or bottom wall of the box body 400 and the battery pack 100. When there are multiple battery packs 100, the heat exchange element can also be arranged between adjacent battery packs 100.

[0336] In some examples, the heat exchange component may be a cold plate, and a heat exchange flow channel is formed in the cold plate. The heat exchange flow channel is used to accommodate and flow a heat exchange medium. The heat exchange medium can directly or intermittently contact the soft-pack battery cell 11 through the cold plate to exchange heat with the soft-pack battery cell 11. In some embodiments, the heat exchange component may also be a heat exchange tube. The number of heat exchange tubes may be one or more. A heat exchange flow channel for the flow of the heat exchange medium is defined in the heat exchange tube. The heat exchange medium can pass through the tube wall of the heat exchange tube and the soft-pack battery cell 11 for heat exchange.

[0337] Due to the heat exchange between the heat exchange component and the soft-pack battery cell 11, when the temperature of the soft-pack battery cell 11 is high, the heat can be transferred to the heat exchange component by heat conduction, so that the soft-pack battery cell 11 is in a suitable operating temperature range, thereby improving the service life of the battery device 1000. When the temperature of the soft-pack battery cell 11 is too low, the heat exchange medium can heat the soft-pack battery cell 11 through the heat exchange component to improve the charging and discharging efficiency of the soft-pack battery cell 11.

[0338] In the above technical solution, by arranging the heat exchange element in the accommodating cavity 401 for heat exchange with the soft-pack battery cell 11, the soft-pack battery cell 11 can be kept in a suitable operating temperature range, thereby improving the charging and discharging efficiency of the soft-pack battery cell 11 and extending the service life of the battery device 1000.

[0339] In some embodiments of the present invention, the heat exchange element is disposed at the bottom of the box body 400 .

[0340] In the above technical solution, the heat exchange component is arranged at the bottom of the box body 400, which can effectively absorb the heat transferred downward by the soft-pack battery cell 11 during operation, thereby improving the heat exchange efficiency. At the same time, the bottom space of the box body 400 can also be effectively utilized to make the layout inside the battery device 1000 compact and reasonable.

[0341] In some embodiments of the present invention, the battery pack 100 is bonded to the heat exchange element via an adhesive layer.

[0342] For example, adhesive may be applied between the battery pack 100 and the heat exchange element to achieve bonding connection, or the battery pack 100 and the heat exchange element may be bonded together using double-sided tape.

[0343] In some examples, the battery pack 100 and the heat exchange element are bonded and connected via a heat conductive adhesive layer. For example, the battery pack 100 and the heat exchange element are bonded and connected via a heat conductive structural adhesive, thereby improving the heat exchange efficiency between the battery pack 100 and the heat exchange element.

[0344] In the above technical solution, the battery pack 100 and the heat exchange component are bonded together by an adhesive layer, which can simplify the connection structure between the battery pack 100 and the heat exchange component and improve assembly efficiency. It can also achieve a close fit between the heat exchange component and the battery pack 100 and improve heat conduction efficiency. In addition, the adhesive layer can also play a buffering and vibration reduction role between the battery pack 100 and the heat exchange component, thereby increasing the service life of the battery device 1000.

[0345] In some embodiments of the present invention, a portion of the adhesive layer is configured to overflow between two adjacent soft-pack battery cells 11 in a first direction X to bond and connect the two adjacent soft-pack battery cells 11 . The first direction X is the thickness direction of the soft-pack battery cells 11 .

[0346] For example, the heat exchange component is a cold plate, and the cold plate is arranged at the bottom of the battery pack 100. When the battery pack 100 and the heat exchange component are bonded and connected, the bonding layer includes two parts. The first part of the bonding layer is bonded and connected between the surfaces of the heat exchange component and the battery pack 100 that are opposite to each other in the second direction Z, that is, the first part of the bonding layer is bonded and connected between the upper surface of the heat exchange component and the lower surface of the battery pack 100, and the second part of the bonding layer overflows into the gap between two adjacent soft-pack battery cells 11. At this time, the facing surfaces of the two adjacent soft-pack battery cells 11 can be bonded and connected by the second part of the bonding layer.

[0347] In some specific examples, arc-shaped chamfers are formed between the adjacent two side surfaces of the outer surface of the membrane shell of the soft-pack battery cell 11, and the chamfer positions of the two adjacent soft-pack battery cells 11 can be combined to form an overflow space. When the heat exchanger and the battery pack 100 are bonded, a proper amount of adhesive is applied to the connection surface of the heat exchanger and the battery pack 100 to form an adhesive layer, and then the connection surface of the heat exchanger and the battery pack 100 are bonded. At this time, since the adhesive has a certain fluidity, under the action of pressure, part of the adhesive can enter the overflow space formed by the two adjacent soft-pack battery cells 11, that is, part of the adhesive overflows between the two adjacent soft-pack battery cells 11. After the adhesive is cured, the adhesive layer not only realizes the bonding fixation between the battery pack 100 and the heat exchanger, but also realizes the bonding fixation between the two adjacent soft-pack battery cells 11, thereby improving the reliability of the bonding fixation.

[0348] In the above technical solution, a part of the adhesive layer overflows between two adjacent soft-pack battery cells 11 to achieve the bonding connection of the adjacent soft-pack battery cells 11, which can not only enhance the integrity of the battery pack 100, make the connection between the adjacent soft-pack battery cells 11 tighter, reduce the risk of relative displacement between the soft-pack battery cells 11, and improve the overall structural stability of the battery pack 100, but also help to improve the heat conduction efficiency between the heat exchange component and the soft-pack battery cell 11, and improve the thermal management performance of the battery pack 100.

[0349] In a third aspect, an embodiment of the utility model further provides an electrical device 1, comprising the battery device 1000 of any of the above embodiments.

[0350] In the above technical solution, since the electrical device 1 is provided with the above-mentioned battery device 1000, the separator 20 of the battery pack 100 separates the multiple soft-pack battery cells 11 into multiple soft-pack units 10, and each soft-pack unit 10 is connected to the separator 20. The separator 20 can not only play a role of separation and isolation between two adjacent soft-pack units 10, reducing the probability of thermal runaway gas propagating to the location of the adjacent soft-pack unit 10, reducing the risk of causing thermal runaway of the adjacent soft-pack unit 10, but also reduce the probability of contact, extrusion and friction between the soft-pack battery cells 11 of the adjacent soft-pack units 10, reducing the relative The risk of short circuit between the soft-pack battery cells 11 of adjacent soft-pack units 10; and the separator 20 can also reduce the activity and deformation range of the soft-pack battery cells 11 in each soft-pack unit 10, improve the stability of the position of the soft-pack unit 10 in the battery pack 100, and reduce the probability of short circuit or leakage caused by the movement of the soft-pack battery cells 11; in addition, the separator 20 can also disperse external impact force, reduce the probability of a single soft-pack battery cell 11 being subjected to excessive impact force, increase the service life of the soft-pack battery cell 11, and increase the service life of the battery device 1000, thereby improving the overall performance of the electrical device 1.

[0351] The following will refer to Figure 2-Figure 6 The battery device 1000 according to two specific embodiments of the present invention is described.

[0352] Embodiment 1,

[0353] Reference Figure 2-Figure 4 The battery device 1000 includes: a box body 400, a battery pack 100 and a heat exchanger. The box body 400 is in a rectangular parallelepiped shape, and includes a box body 410 and a cover plate 420. The box body 410 defines a receiving cavity 401 that is opened outward. The cover plate 420 is provided on the upper side of the box body 410 to cover the open side of the receiving cavity 401. The box body 400 may be an aluminum alloy part. The length direction of the box body 400 is set as the front-to-back direction, the width direction of the box body 400 is set as the left-to-right direction, and the height direction of the box body 400 is set as the up-down direction.

[0354] The battery pack 100 is placed in the accommodating cavity 401 of the box body 400. The battery pack 100 includes a separator 20 and a plurality of soft-pack battery cells 11, wherein the separator 20 is a metal part, for example, the separator 20 is an aluminum part, the separator 20 is an integral part, and includes a plurality of first plates 21 and a plurality of second plates 22, the plurality of first plates 21 are all flat plate shapes perpendicular to the front-to-back direction, and are arranged at intervals in the front-to-back direction, the plurality of second plates 22 are arranged on the upper side of the plurality of first plates 21, and the two adjacent first plates 21 are connected by a second plate 22, at this time, the two adjacent first plates 21 and the second plate 22 connected between the two first plates 21 jointly define a U-shaped cavity 201 with an open lower side. In this embodiment, the number of the first plates 21 is eight, the number of the second plates 22 is seven, and the separator 20 defines seven cavities 201 arranged in sequence along the length direction of the box body 400, and the openings of the plurality of cavities 201 are all set downward.

[0355] The thickness of the first plate portion 21 and the second plate portion 22 are both greater than or equal to 0.4 mm and less than or equal to 1 mm. The thickness of the first plate portion 21 is greater than the thickness of the second plate portion 22 .

[0356] Furthermore, each second plate portion 22 is formed with a pressure relief structure, which may be a notch or an etching, or a pressure relief hole that passes through the second plate portion 22 vertically, and the pressure relief hole is covered with an insulating film. A heat exchange flow channel may be formed in the second plate portion 22 .

[0357] The soft-pack battery cell 11 is in a rectangular parallelepiped shape, and the length direction of the soft-pack battery cell 11 is along the left-right direction, the width direction of the soft-pack battery cell 11 is along the up-down direction, and the thickness direction of the soft-pack battery cell 11 is along the front-back direction.

[0358] Among them, a plurality of soft-pack battery cells 11 form a plurality of soft-pack units 10, and each soft-pack unit 10 includes a plurality of soft-pack battery cells 11 sequentially stacked in the front-to-back direction. In this embodiment, the battery device 1000 has seven soft-pack units 10, and each soft-pack unit 10 includes four soft-pack battery cells 11 sequentially stacked in the length direction of the box body 400. Among them, the plurality of soft-pack units 10 correspond to the plurality of cavities 201 one by one and are arranged in the corresponding cavities 201.

[0359] Furthermore, each soft-pack battery cell 11 includes a membrane shell, an electrode assembly arranged in the membrane shell, and an electrolyte filled in the membrane shell. A structurally weak portion is formed on the membrane shell, and the structurally weak portion is arranged on the side of the membrane shell facing the pressure relief structure of the second plate portion 22.

[0360] Furthermore, the electrode assembly includes two tabs, and the two tabs extend out of the membrane shell from the left and right ends of the membrane shell, respectively. Furthermore, the battery pack 100 also includes a busbar and a pole, the busbar is connected to the tabs of the soft-pack battery cell 11, and the pole is connected to the busbars located on the left and right sides of the plurality of soft-pack units 10, respectively, wherein the pole can be arranged on the left and right sides of the separator 20, and the pole can also be arranged on the upper side or the lower side of the separator 20.

[0361] The heat exchange component is a cold plate, which is arranged between the bottom wall of the accommodating cavity 401 and the battery pack 100, and the cold plate is bonded to the battery pack 100. Specifically, the cold plate is bonded to the partition 20, and the cold plate is bonded to multiple soft-pack battery cells 11, wherein a portion of the bonding layer between the cold plate and the battery pack 100 can overflow into the overflow space surrounded by the chamfered position of the outer contour of the adjacent soft-pack battery cells 11, and the adjacent soft-pack battery cells 11 are bonded and connected.

[0362] In the battery device 1000 of the above-mentioned embodiment, the partition 20 of the battery pack 100 can provide accommodation and support for the soft-pack unit 10 and isolate adjacent soft-pack units 10. Since the partition 20 is an integral part, the overall structural strength of the battery pack 100 can be improved. Moreover, since a first plate portion 21 located between two soft-pack units 10 can achieve isolation between two adjacent soft-pack units 10, the space occupied by the battery pack 100 in the front-to-back direction (first direction X) can be reduced, thereby improving the space utilization in the front-to-back direction (first direction X).

[0363] Embodiment 2:

[0364] like Figure 5 and Figure 6 As shown, the structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the multiple second plate portions 22 of the separator 20 in the first embodiment are all arranged on the upper side of the multiple first plate portions 21, while the multiple second plate portions 22 in the second embodiment are respectively arranged on the upper and lower sides of the multiple first plate portions 21, and in the front-to-back direction, the multiple second plate portions 22 are alternately arranged on the upper and lower sides of the multiple first plate portions 21. At this time, the separator 20 defines a plurality of cavities 201, and the openings of two adjacent cavities 201 face the upper and lower sides, respectively.

[0365] In the battery device 1000 of this embodiment, the second plate portions 22 are alternately arranged on the upper and lower sides of the first plate portion 21, so that the openings of adjacent cavities 201 are oriented in opposite directions, thereby improving the isolation effect between adjacent soft-pack units 10. When thermal runaway occurs in a soft-pack unit 10, the risk of high-temperature gas flowing into the adjacent cavity 201 can be reduced, thereby reducing the risk of thermal runaway spreading.

[0366] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery pack, characterized in that: include: A plurality of soft-pack battery cells (11); a separator (20), wherein the separator (20) separates the plurality of soft-pack battery cells (11) into a plurality of soft-pack units (10), each of the soft-pack units (10) is connected to the separator (20), and each of the soft-pack units (10) includes at least two of the soft-pack battery cells (11), The separator (20) defines a plurality of cavities (201) that are separated from each other and arranged in sequence along a first direction (X); the plurality of soft-pack units (10) correspond to the plurality of cavities (201) one by one and are arranged in the corresponding cavities (201). One side of the cavity (201) in a second direction (Z) is open to form an opening, the second direction (Z) is an up-down direction and intersects the first direction, the cavity (201) has a bottom wall arranged opposite to the opening in the second direction (Z), and at least a portion of the bottom wall of the cavity (201) is bonded to the soft-pack battery cell (11).

2. The battery pack according to claim 1, characterized in that: The separator (20) comprises: a plurality of first plate portions (21) and a plurality of second plate portions (22), the number of the first plate portions (21) being at least three, the plurality of first plate portions (21) being arranged in sequence and spaced apart along the first direction (X), the second plate portion (22) being connected between two adjacent first plate portions (21), and the second plate portion (22) and the two adjacent first plate portions (21) cooperating to enclose the cavity (201).

3. The battery pack according to claim 2, characterized in that: Both ends of the second plate portion (22) in the first direction (X) are respectively connected to the end edges of the same end of two adjacent first plate portions (21) in the second direction (Z).

4. The battery pack according to claim 3, characterized in that: The plurality of second plate portions (22) are all arranged on the same side of the plurality of first plate portions (21) in the second direction (Z).

5. The battery pack according to claim 3, characterized in that: The plurality of second plate portions (22) are respectively arranged on both sides of the plurality of first plate portions (21) in the second direction (Z).

6. The battery pack according to claim 5, characterized in that: Two second plate portions (22) adjacent to each other in the first direction (X) are respectively arranged on both sides of the first plate portion (21) in the second direction (Z).

7. The battery pack according to claim 2, characterized in that: A pressure relief structure is provided on the second plate portion (22), and the pressure relief structure is configured to enable the cavity (201) to communicate with the external space of the partition (20) when the pressure in the cavity (201) is greater than a preset pressure.

8. The battery pack according to claim 7, characterized in that: The pressure relief structure is a structurally weak area on the second plate portion (22).

9. The battery pack according to claim 8, characterized in that: The structurally weak area is formed with notches or etchings.

10. The battery pack according to claim 7, characterized in that: The pressure relief structure is formed as a pressure relief hole that penetrates the second plate portion (22) along a thickness direction of the second plate portion (22).

11. The battery pack according to claim 10, characterized in that: Also includes: An insulating film, wherein the insulating film is arranged on the second plate portion (22) and completely covers the pressure relief hole.

12. The battery pack according to claim 11, characterized in that: The thickness of the insulating film is greater than or equal to 0.03 mm and less than or equal to 0.3 mm.

13. The battery pack according to claim 12, characterized in that: The thickness of the insulating film is greater than or equal to 0.1 mm and less than or equal to 0.2 mm.

14. The battery pack according to any one of claims 2 to 13, characterized in that: The thickness of the plate material of the separator (20) is greater than or equal to 0.4 mm and less than or equal to 1 mm.

15. The battery pack according to claim 14, characterized in that: The thickness of the first plate portion (21) is greater than the thickness of the second plate portion (22).

16. The battery pack according to any one of claims 2 to 13, characterized in that: The first plate portion (21) and the second plate portion (22) are connected by welding, snap-fitting or integrally formed.

17. The battery pack according to any one of claims 2 to 13, characterized in that: A heat exchange flow channel is formed in the first plate portion (21).

18. The battery pack according to claim 1, characterized in that: The separator (20) is a metal piece.

19. The battery pack according to claim 18, characterized in that: The separator (20) is made of aluminum, aluminum alloy, stainless steel or nickel.

20. The battery pack according to claim 1, characterized in that: The soft-pack battery cell (11) is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

21. The battery pack according to claim 1, characterized in that: The soft-pack battery cell (11) is a ternary battery cell, and a pressure relief zone is provided on the separator (20). The pressure relief zone is configured to allow the inner space of the separator (20) to communicate with the outer space of the separator (20) when a preset condition is met.

22. The battery pack according to claim 21, characterized in that: The pressure relief area is formed with a through hole penetrating the separator (20).

23. The battery pack according to claim 21, characterized in that: The pressure relief area is a structurally weakened area of ​​the separator (20), and the structurally weakened area is provided with notches or etchings.

24. The battery pack according to claim 1, characterized in that: The soft-pack battery cell (11) comprises a membrane shell, and a structurally weak portion is provided on the membrane shell.

25. The battery pack according to claim 1, characterized in that: The partition comprises a first shell wall and two second shell walls, the first shell wall extends along the first direction, the two second shell walls are respectively connected to two ends of the second shell wall in the first direction and extend away from the first shell wall along the second direction. The first shell wall cooperates with the two second shell walls to define a receiving cavity, and one end of the two second shell walls away from the first shell wall cooperates to define an open opening connected to the receiving cavity, and the soft package unit is arranged in the receiving cavity.

26. The battery pack according to claim 1, characterized in that: The plurality of soft-pack units (10) are arranged in sequence along the first direction (X), and the battery pack (100) further comprises: a busbar, the busbar being arranged on both sides of the plurality of soft-pack units (10) in a third direction (Y), the busbar being electrically connected to the soft-pack units (10), and the first direction (X) intersects with the third direction (Y).

27. The battery pack according to claim 26, characterized in that: The battery pack (100) further comprises: two poles, the two poles being respectively connected to the busbars on both sides of the soft pack unit (10) in the third direction (Y), The poles are arranged on both sides of the partition (20) in the third direction (Y), or the poles are arranged on one side of the partition (20) in the second direction (Z), and the second direction (Z) intersects both the first direction (X) and the third direction (Y).

28. A battery device, characterized in that: include: A box body (400), wherein the box body (400) has a receiving cavity (401); According to any one of claims 1 to 27, the battery pack (100) is arranged in the accommodating cavity (401).

29. The battery device according to claim 28, characterized in that An exhaust passage is provided in the box body (400), and a pressure relief structure is provided on the partition (20), the pressure relief structure being in communication with the exhaust passage.

30. The battery device according to claim 28, characterized in that Also includes: A heat exchange component is arranged in the accommodating cavity (401) and is located between the battery pack (100) and the inner wall of the box body (400), and is used for heat exchange with the soft-pack battery cell (11).

31. The battery device according to claim 30, characterized in that The heat exchange element is arranged at the bottom of the box body.

32. The battery device according to claim 30, characterized in that The battery pack (100) is bonded to the heat exchange component via an adhesive layer.

33. The battery device according to claim 32, characterized in that A portion of the adhesive layer is configured to overflow between two adjacent soft-pack battery cells (11) in the first direction (X) to bond and connect the two adjacent soft-pack battery cells (11), wherein the first direction (X) is the thickness direction of the soft-pack battery cells (11).

34. An electrical device, characterized in that: Comprising a battery device (1000) according to any one of claims 28-33.

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