Pouch battery cell, battery device, and electric device

Abstract

A pouch battery cell (100), a battery device (200), and an electric device (1000). The pouch battery cell (100) comprises a casing (10), an electrode assembly (20), and a gas storage structure (30). Both the electrode assembly (20) and the gas storage structure (30) are accommodated in the casing (10). In a thickness direction of the pouch battery cell (100), an accommodating gap (12) is defined between the electrode assembly (20) and the casing (10). The gas storage structure (30) is accommodated in the accommodating gap (12). At least a portion of the gas storage structure (30) is a hydrogen storage metal.

Description

Soft-pack battery cells, battery packs and electrical devices Technical Field

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

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

[0003] Pouch batteries generate a certain amount of gas during use, which increases the internal pressure. When this internal pressure increases to a certain level, there is a risk of thermal runaway, reducing battery life. Furthermore, the gas generated during pouch battery operation typically contains hydrogen; for example, alkali metal pouch batteries produce a higher amount of hydrogen. Hydrogen is a flammable and explosive gas, further increasing the risk of thermal runaway. Therefore, effectively controlling the internal pressure of individual pouch battery cells to reduce the risk of thermal runaway is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides a soft-pack battery cell, a battery device and an electrical device. The soft-pack battery cell can effectively control its internal pressure, which can reduce the risk of thermal runaway of the soft-pack battery cell and help extend the battery's service life.

[0005] In a first aspect, this application provides a pouch cell, comprising: a housing; an electrode assembly housed within the housing, wherein a housing gap is defined between the electrode assembly and the housing in the thickness direction of the pouch cell; and a gas storage structure housed within the housing and located within the housing gap, wherein at least a portion of the gas storage structure is a hydrogen storage metal.

[0006] In the above technical solution, by setting a gas storage structure inside the shell of the pouch battery cell, the gas generated during the operation of the pouch battery cell can be adsorbed and stored. For example, the hydrogen storage metal in the gas storage structure can adsorb and store the hydrogen generated during the operation of the pouch battery cell, thereby reducing the internal pressure inside the pouch battery cell, reducing the risk of thermal runaway, and helping to extend the battery's service life. Furthermore, by setting the gas storage structure on the large side of the pouch battery cell, the space on the large side of the pouch battery cell can be fully utilized, allowing for a larger size of the gas storage structure, thus giving it a greater gas storage capacity, which is even more conducive to extending the battery's service life.

[0007] In some embodiments, the gas storage structure is formed in a sheet-like shape, and the thickness direction of the gas storage structure is consistent with the thickness direction of the soft-pack battery cell.

[0008] In the above technical solution, by setting the gas storage structure on the large side of the pouch battery cell and making the gas storage structure layered, the flat space on the large side of the pouch battery cell can be fully utilized. While the size of the gas storage structure can be set to be large, the size of the gas storage structure in the thickness direction of the pouch battery cell can be made smaller, reducing the space occupied by the gas storage structure in the thickness direction of the pouch battery cell. This makes the overall structure of the pouch battery cell compact. Setting the gas storage structure inside the pouch battery cell is also beneficial to making the energy density of the pouch battery cell higher.

[0009] In some embodiments, at least a portion of the gas storage structure is formed as a coating.

[0010] In the above technical solution, by setting at least part of the gas storage structure as a coating structure, it is convenient to set the gas storage structure inside the shell of the soft-pack battery cell by coating, which is also conducive to the large-area setting of the gas storage structure and to improving the gas storage capacity of the gas storage structure.

[0011] In some embodiments, the gas storage structure includes a shell and a gas storage material filled within the shell, wherein at least a portion of the gas storage material is a hydrogen storage metal, the gas storage material is granular or powdered, and the shell has permeable pores formed thereon, the pore size of which is smaller than the particle size of the gas storage material.

[0012] In the above technical solution, by setting the gas storage structure to include a covering shell and a gas storage material in the form of granules or powders filled in the covering shell, the surface area of ​​the gas storage material can be increased, the contact area between the gas storage material and the gas can be increased, which is beneficial to improving the gas storage capacity of the gas storage structure, and also beneficial to enable the gas in the soft-pack battery cell to be quickly adsorbed and stored in the gas storage material.

[0013] In some embodiments, in the thickness direction of the pouch cell, the wall of the outer casing facing the electrode assembly is a first shell wall, the surface of the electrode assembly facing the outer casing is a first surface, and the gas storage structure is fixed to the first shell wall and / or the first surface.

[0014] In the above technical solution, by fixing the gas storage structure to the first surface of the electrode assembly and / or the first shell wall of the outer shell, the gas storage structure has a large fixed installation area, which facilitates the installation and fixing of the gas storage structure.

[0015] In some embodiments, the gas storage structure is bonded and fixed to the first shell wall and / or the first surface.

[0016] In the above technical solution, the gas storage structure is bonded and fixed to the first shell wall and / or the first surface. The bonding and fixing method is simple and easy to operate, which makes the installation and fixing operation of the gas storage structure relatively simple.

[0017] In some embodiments, at least a portion of the gas storage structure is formed as a coating applied to the first shell wall and / or the first surface.

[0018] In the above technical solution, by setting the gas storage structure as a coating applied to the first shell wall and / or the first surface, the formation of the gas storage structure can be simplified, and the surface area of ​​the gas storage structure can be increased, which can increase the contact area between the gas storage structure and the gas inside the shell, thus improving the gas storage capacity of the gas storage structure.

[0019] In some embodiments, the pouch cell includes a first insulating layer, at least a portion of which is located between the gas storage structure and the first shell wall and / or at least a portion of which is located between the gas storage structure and the first surface.

[0020] In the above technical solution, by providing a first insulating layer between the gas storage structure and the first shell wall and / or by providing a first insulating layer between the gas storage structure and the first surface of the electrode assembly, the gas storage structure can be insulated from the shell and / or the electrode assembly, thereby preventing the gas storage structure from forming an electrical conduction path between the shell and the electrode assembly and improving the reliability of the soft-pack battery cell.

[0021] In some embodiments, the projection of the gas storage structure along the thickness direction of the pouch cell lies within the projection of the first insulating layer along the thickness direction of the pouch cell.

[0022] In the above technical solution, by making the projection of the gas storage structure along the thickness direction of the pouch battery cell located within the projection of the first insulating layer along the thickness direction of the pouch battery cell, the first insulating layer can completely cover the gas storage structure in the thickness direction of the pouch battery cell. This can better insulate the gas storage structure from the outer casing and / or electrode assembly, thereby better preventing the gas storage structure from forming an electrical conduction path between the outer casing and the electrode assembly, and better improving the reliability of the pouch battery cell.

[0023] In some embodiments, the first insulating layer is a double-sided adhesive layer, and the gas storage structure is bonded and fixed to the first shell wall and / or the first surface through the first insulating layer.

[0024] In the above technical solution, by setting the first insulating layer as a double-sided adhesive layer, the gas storage structure is bonded and fixed to the first shell wall and / or the first surface through the first insulating layer. In this way, the first insulating layer can not only serve to insulate and separate the gas storage structure from the shell and / or electrode assembly, but also serve to bond and fix the gas storage structure, thus eliminating the need to set a separate adhesive layer for bonding and fixing the gas storage structure.

[0025] In some embodiments, the gas storage structure is fixed to the first insulating layer.

[0026] In the above technical solution, fixing the gas storage structure to the first insulating layer can integrate the gas storage structure and the first insulating layer into one piece, which is convenient for installation and fixation.

[0027] In some embodiments, the electrode assembly includes an electrode body and tabs connected to one side or opposite sides of the electrode body, and defining at least a portion of the receiving gap between the tabs and the housing in the thickness direction of the pouch cell.

[0028] In the above technical solution, by defining at least a portion of the accommodating gap between the electrode assembly's tab and the outer casing, the gap between the electrode assembly's tab and the outer casing can be fully utilized to accommodate the gas storage structure, making the overall structure of the pouch battery cell compact. While setting the gas storage structure inside the pouch battery cell, it is beneficial to make the energy density of the pouch battery cell higher.

[0029] In some embodiments, the electrode tab is provided with the gas storage structure.

[0030] In the above technical solution, by setting a gas storage structure on the electrode tab, it is convenient to install and fix the gas storage structure, and also convenient to assemble the soft-pack battery cell. For example, by installing a gas storage structure on the electrode tab, the gas storage structure and the electrode assembly are integrated into a whole, making it convenient to assemble the electrode assembly and the gas storage structure together into the casing.

[0031] In some embodiments, the pouch cell further includes a lead-out member, at least a portion of which is located outside the housing. The tab includes a connection area and an assembly area. The lead-out member is connected to the connection area. In the thickness direction of the pouch cell, the surface of the electrode assembly facing the housing is a first surface. The first surface includes the assembly area, which faces the receiving gap. The assembly area is provided with the gas storage structure.

[0032] In the above technical solution, by setting the gas storage structure provided on the tab in the assembly area of ​​the tab, the assembly area of ​​the tab can be fully utilized to install and fix the gas storage structure, and the at least part of the accommodating gap formed between the assembly area and the outer shell can be fully utilized to accommodate the gas storage structure. This can reduce the extra space occupied by the gas storage structure inside the soft-pack battery cell, making the structure of the soft-pack battery cell more compact.

[0033] In some embodiments, the ratio of the area of ​​the gas storage structure covering the assembly area to the area of ​​the assembly area is greater than 0.6.

[0034] In the above technical solution, by making the ratio of the area of ​​the gas storage structure covering the assembly area to the area of ​​the assembly area greater than 0.6, the area of ​​the gas storage structure covering the assembly area can be larger, thereby making the size and surface area of ​​the gas storage structure larger and improving the gas storage capacity of the gas storage structure.

[0035] In some embodiments, the gas storage structure located in the assembly area is situated within the assembly area.

[0036] In the above technical solution, by placing the gas storage structure in the assembly area within the assembly area, the gas storage structure can fully utilize the assembly area as a support carrier while ensuring that the gas storage structure does not extend beyond the outer edge of the assembly area. This prevents the gas storage structure from occupying additional space beyond the outer edge of the assembly area, thereby reducing interference between the gas storage structure in the assembly area and other components inside the housing, and minimizing the impact of the gas storage structure in the assembly area on the installation of other components inside the housing.

[0037] In some embodiments, in the thickness direction of the pouch cell, the surface of the electrode body facing the outer casing is the main surface, the first surface includes the main surface, and the gas storage structure disposed in the assembly area is located between the plane where the assembly area and the main surface are located.

[0038] In the above technical solution, by ensuring that the gas storage structure set in the assembly area does not extend beyond the surface of the electrode body facing the outer shell in the thickness direction of the soft-pack battery cell, the gas storage structure set in the assembly area will not occupy additional space in the thickness direction of the soft-pack battery cell. That is, the gas storage structure set in the assembly area will not increase the thickness of the soft-pack battery cell, which is beneficial to improving the energy density of the soft-pack battery cell.

[0039] In some embodiments, the gas storage structure located in the assembly area is spaced apart from the electrode body.

[0040] In the above technical solution, by separating the gas storage structure in the assembly area from the electrode body, the short circuit between multiple electrodes of the electrode body caused by contact between the gas storage structure in the assembly area and the electrode body can be reduced or avoided, thereby improving the reliability of the soft-pack battery cell.

[0041] In some embodiments, the pouch cell includes a second insulating layer, at least a portion of which is located between the gas storage structure disposed in the assembly area and the electrode body.

[0042] In the above technical solution, by setting a second insulating layer between the gas storage structure in the assembly area and the electrode body, the gas storage structure in the assembly area can be better isolated from the electrode body, which can better reduce or avoid short circuits between multiple electrodes of the electrode body caused by the gas storage structure in the assembly area contacting the electrode body, thereby improving the reliability of the soft-pack battery cell.

[0043] In some embodiments, the second insulating layer includes a first insulating portion and a second insulating portion connected together, the first insulating portion being located between the gas storage structure and the electrode body, the surface of the electrode body facing the outer casing being the main surface, the first surface including the main surface, and the second insulating portion being located on the main surface.

[0044] In the above technical solution, by setting the second insulating layer to include a first insulating part and a second insulating part, and setting the first insulating part between the gas storage structure and the electrode body, the first insulating part can insulate the gas storage structure in the assembly area from the electrode body, and the second insulating part of the second insulating layer is located on the main surface of the electrode body, that is, the second insulating layer extends from the side of the electrode body adjacent to the assembly area to the main surface of the electrode body, so that the second insulating layer completely covers the side of the electrode body adjacent to the assembly area, which can better insulate the gas storage structure in the assembly area from the electrode body, and can make the second insulating layer and the electrode body have a larger contact area, thereby facilitating the fixing of the second insulating layer to the electrode body, and making the connection and fixation between the second insulating layer and the electrode body more stable.

[0045] In some embodiments, the pouch cell includes a first insulating layer, the wall of the housing facing the electrode assembly is a first housing wall, and at least a portion of the first insulating layer is located between the gas storage structure and the assembly area or at least a portion of the first insulating layer is located between the gas storage structure and the first housing wall.

[0046] In the above technical solution, by providing a first insulating layer between the gas storage structure in the assembly area and the assembly area and / or providing a first insulating layer between the gas storage structure and the first shell wall, the gas storage structure in the assembly area can be insulated from the shell and / or the electrode tab, thereby preventing the gas storage structure from forming an electrical conduction path between the shell and the electrode tab, and improving the reliability of the soft-pack battery cell.

[0047] In some embodiments, in the thickness direction of the pouch cell, the projection of the first insulating layer opposite to the assembly area in the assembly area is located within the assembly area, and the projection of the gas storage structure opposite to the assembly area in the assembly area is located within the projection of the corresponding first insulating layer in the assembly area.

[0048] In the above technical solution, by making the first insulating layer located within the assembly area without extending beyond the outer edge of the assembly area, the first insulating layer located in the assembly area will not occupy additional space beyond the outer edge of the assembly area. This can reduce the interference between the first insulating layer located in the assembly area and other components inside the housing, and reduce the impact of the first insulating layer located in the assembly area on the installation of other components inside the housing.

[0049] Furthermore, the projection of the gas storage structure opposite to the assembly area in the assembly area is located within the projection of the corresponding first insulating layer in the assembly area. In this way, the first insulating layer can completely cover the gas storage structure in the thickness direction of the pouch battery cell, thereby better insulating the gas storage structure from the outer casing and / or the tabs. This better prevents the gas storage structure from forming an electrical conduction path between the outer casing and the tabs, thus improving the reliability of the pouch battery cell. At the same time, the gas storage structure opposite to the assembly area will not occupy additional space beyond the outer edge of the assembly area. This reduces interference between the gas storage structure in the assembly area and other components inside the casing, and reduces the impact of the gas storage structure in the assembly area on the installation of other components inside the casing.

[0050] In some embodiments, at least a portion of the first insulating layer is located between the gas storage structure and the assembly area, and the pouch cell further includes a second insulating layer, at least a portion of which is located between the gas storage structure and the electrode body. The second insulating layer is connected to and integrally formed with the first insulating layer.

[0051] In the above technical solution, by providing a first insulating layer between the gas storage structure and the assembly area, the gas storage structure can be insulated from the outer casing and / or the electrode tabs, thereby better preventing the formation of an electrical conduction path between the gas storage structure and the electrode tabs, and improving the reliability of the pouch battery cell. Furthermore, by providing a second insulating layer between the gas storage structure and the electrode body, the gas storage structure in the assembly area can be insulated from the electrode body, reducing or preventing short circuits between multiple electrodes of the electrode body caused by contact between the gas storage structure and the electrode body, thus improving the reliability of the pouch battery cell. In addition, by integrally molding the first and second insulating layers, they form a single unit, facilitating their installation and fixation.

[0052] In some embodiments, the electrode assembly includes an electrode body and tabs connected to one side or opposite sides of the electrode body, and in the thickness direction of the pouch cell, at least a portion of the receiving gap is defined between the electrode body and the housing.

[0053] In the above technical solution, by defining at least a portion of the accommodating gap between the electrode body and the outer shell in the thickness direction of the soft-pack battery cell, the large flat space between the electrode body and the outer shell can be fully utilized to accommodate the gas storage structure. This allows the gas storage structure to be set to a larger size, thereby giving it a larger gas storage capacity and making it more conducive to extending the battery's service life.

[0054] In some embodiments, the surface of the electrode body facing the receiving gap is the main surface, and the main surface is provided with the gas storage structure.

[0055] In the above technical solution, the gas storage structure is installed and fixed on the main surface of the electrode body. The large area of ​​the main surface of the electrode body facilitates the installation and fixing of the gas storage structure, and also makes the fixing area between the gas storage structure and the electrode body larger, making the fixing of the gas storage structure more stable.

[0056] In some embodiments, the ratio of the area of ​​the gas storage structure covering the main surface to the area of ​​the main surface is greater than 0.6.

[0057] In the above technical solution, by making the ratio of the area of ​​the gas storage structure covering the main surface to the area of ​​the main surface greater than 0.6, the area of ​​the gas storage structure covering the main surface can be larger, thereby making the size and surface area of ​​the gas storage structure larger and improving the gas storage capacity of the gas storage structure.

[0058] In some embodiments, the gas storage structure disposed on the main surface is located within the main surface.

[0059] In the above technical solution, by making the gas storage structure located on the main surface within the main surface, the gas storage structure makes full use of the main surface as a supporting carrier, while ensuring that the gas storage structure on the main surface does not extend beyond the outer edge of the main surface. In this way, the gas storage structure on the main surface will not occupy additional space beyond the outer edge of the main surface, thereby reducing interference between the gas storage structure on the main surface and other components inside the shell, and reducing the impact of the gas storage structure on the main surface on the installation of other components inside the shell.

[0060] In some embodiments, the pouch cell includes a first insulating layer, and in the thickness direction of the pouch cell, the wall of the outer casing facing the electrode assembly is a first shell wall, the surface of the electrode body facing the receiving gap is a main surface, and at least a portion of the first insulating layer is located between the gas storage structure and the first shell wall or at least a portion of the first insulating layer is located between the gas storage structure and the main surface.

[0061] In the above technical solution, by providing a first insulating layer between the gas storage structure and the first shell wall and / or between the gas storage structure and the main surface of the electrode body, the gas storage structure can be insulated from the shell and / or the electrode body, thereby better preventing the gas storage structure from forming an electrical conduction path between the shell and the electrode body, and better improving the reliability of the soft-pack battery cell.

[0062] In some embodiments, in the thickness direction of the pouch cell, the projection of the first insulating layer opposite to the main surface on the main surface is located within the main surface, and the projection of the gas storage structure opposite to the main surface on the main surface is located within the projection of the corresponding first insulating layer on the main surface.

[0063] In the above technical solution, the projection of the gas storage structure opposite to the main surface on the main surface is located within the projection of the corresponding first insulating layer on the main surface. In this way, the first insulating layer can completely cover the gas storage structure in the thickness direction of the pouch cell, thereby better insulating the gas storage structure from the outer casing and / or the electrode body. This can better prevent the gas storage structure from forming an electrical conduction path between the outer casing and the electrode body, thus improving the reliability of the pouch cell. At the same time, the gas storage structure opposite to the main surface will not occupy additional space beyond the outer edge of the main surface. This can reduce the interference between the gas storage structure on the main surface and other components inside the casing, and reduce the impact of the gas storage structure on the main surface on the installation of other components inside the casing.

[0064] In some embodiments, the pouch cell is configured as an alkali metal battery.

[0065] In the above technical solution, by setting the soft-pack battery cell as an alkali metal battery, the soft-pack battery cell can have a high energy density. Furthermore, by setting a gas storage structure on the large side of the soft-pack battery cell, the gas generated during the operation of the soft-pack battery cell, such as hydrogen, can be absorbed and stored, thereby reducing the internal pressure of the soft-pack battery cell.

[0066] In some embodiments, the electrode assembly includes a negative electrode sheet, the negative electrode sheet including a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

[0067] In the above technical solution, by making the active material layer of the negative electrode sheet include active metal elements, the soft-pack battery cell can have a high energy density. Since the active metal elements will react with the electrolyte in the soft-pack battery cell to produce gas, such as a large amount of hydrogen, by setting a gas storage structure on the large side of the soft-pack battery cell, the gas, such as hydrogen, generated during the operation of the soft-pack battery cell can be absorbed and stored, thereby reducing the internal pressure of the soft-pack battery cell.

[0068] In some embodiments, the active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum.

[0069] In the above technical solution, by using an elemental active metal, including at least one of lithium, sodium, potassium, zinc, or aluminum, which is relatively reactive and will undergo side reactions with the electrolyte, producing a large amount of gas with hydrogen accounting for >90% of the gas, for the above-mentioned soft-pack battery cell whose main gas production is hydrogen, by setting a gas storage structure on the large side of the soft-pack battery cell, the hydrogen produced in the soft-pack battery cell is absorbed and stored, which better reduces the internal pressure of the soft-pack battery cell and significantly improves the cycle life of the soft-pack battery cell.

[0070] In some embodiments, the electrolyte of the pouch cell includes a solvent, which is configured as at least one of an ether solvent or an ester solvent.

[0071] In the above technical solution, by setting the solvent in the electrolyte of the soft-pack battery cell as at least one of ether solvent or ester solvent, the ether solvent and ester solvent have good compatibility with the hydrogen storage metal in the gas storage structure, and hydrogen gas is generated during the cycle of the soft-pack battery cell. The generated hydrogen gas can be better absorbed and stored by the hydrogen storage metal, reducing the internal pressure of the soft-pack battery cell and extending the life of the soft-pack battery cell.

[0072] In some embodiments, the solvent includes an ether solvent, which includes at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane.

[0073] In the above technical solution, by including the above-mentioned solvent in the ether solvent, the ether solvent has good compatibility with the hydrogen storage metal in the gas storage structure, and hydrogen is generated during the cycle of the soft-pack battery cell. The generated hydrogen can be better absorbed and stored by the hydrogen storage metal, reducing the internal pressure of the soft-pack battery cell and extending the life of the soft-pack battery cell.

[0074] In some embodiments, the hydrogen storage metal includes zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or La. x Ni y M z At least one of the following, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca or Bi, 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3.

[0075] In the above technical solutions, hydrogen storage metals include zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or La. x Ni y M z At least one of these can enable hydrogen storage metals to have good hydrogen absorption capacity and effect.

[0076] In some embodiments, M includes at least one of Al, Mn, Mg, Fe, Y, or Bi, and 0.3 ≤ x ≤ 1, 1 ≤ y ≤ 5, 0 ≤ z ≤ 1; or the titanium alloy includes at least one of TiNi, Ti2Ni, TiFe, or TiMn2; or the magnesium alloy includes at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr, or Mg2Te; or the zirconium alloy includes at least one of ZrV2, ZrCr2, or ZrMn2; or the vanadium alloy includes V3TiNi. 0.56 M1m, m = 0.046-0.24, M1 includes at least one of Al, Si, Fe, Cu or Zr.

[0077] In the above technical solution, by including at least one of Al, Mn, Mg, Fe, Y or Bi, the hydrogen storage metal can have better hydrogen absorption capacity and hydrogen absorption effect.

[0078] In some embodiments, the hydrogen storage metal includes LaNi 3.5 M2 x1 M3 y1 M4 z1 Where x1 is 0.2-0.6, y1 is 0-1, z1 is 0.3-0.9, x1+y1+z1=1.5, M2 includes at least one of Mn or Fe, M3 includes at least one of Zr, Ti or Y, and M4 includes at least one of Al, Mg, Ca or Bi.

[0079] In the above technical solution, by including LaNi as a hydrogen storage metal... 3.5 M2 x1 M3 y1 M4 z1 This can give hydrogen storage metals better hydrogen absorption capacity and effect.

[0080] In some embodiments, the hydrogen storage metal includes La 0.5 Ni 4.5 Y 0.5 LaNi 3.5 Mn 0.2 YBi 0.3 LaNi 3.5 Mn 0.6 Y 0.4 Bi 0.5 LaNi 3.5 Mn 0.2 Y 0.4 Bi 0.9 LaTi 3.5 Fe 0.4 Zr 0.5 Bi 0.6 LaTi 3.5 Fe 0.4 Zr 0.5 Mg 0.6 LaNi 4.26 Al 0.08 Mg 0.16 Or La 0.43 Y 0.57 Ni 4.5 Al 0.08 Mn 0.3 At least one of them.

[0081] In the above technical solution, by including the aforementioned metal types in the hydrogen storage metal, the hydrogen storage metal can have better hydrogen absorption capacity and hydrogen absorption effect.

[0082] Secondly, this application provides a battery device, including: a pouch cell of the first aspect embodiment described above.

[0083] In the above technical solution, by setting the aforementioned soft-pack battery cell, the internal pressure inside the soft-pack battery cell can be reduced, the risk of thermal runaway in the soft-pack battery cell can be reduced, and the service life of the battery device can be extended.

[0084] Thirdly, this application provides an electrical device, including: the battery device of the second aspect embodiment described above.

[0085] In the above technical solution, by setting the battery device, the battery device has high reliability and long service life, which is conducive to improving the overall performance of the power-consuming device.

[0086] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0087] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0088] Figure 1 is a schematic diagram of a single soft-pack battery cell according to some embodiments of this application;

[0089] Figure 2 is a cross-sectional view along line EE in Figure 1;

[0090] Figure 3 is a cross-sectional schematic diagram of the gas storage structure inside a soft-pack battery cell according to some embodiments of this application;

[0091] Figure 4 is a cross-sectional schematic diagram of the gas storage structure in a single soft-pack battery cell according to some other embodiments of this application;

[0092] Figure 5 is a schematic diagram of the assembly of electrode components and leads of a soft-pack battery cell according to some embodiments of this application;

[0093] Figure 6 is a schematic diagram of the electrode assembly and gas storage structure of a soft-pack battery cell according to some embodiments of this application;

[0094] Figure 7 is a schematic diagram of the electrode assembly and gas storage structure of a soft-pack battery cell according to some other embodiments of this application;

[0095] Figure 8 is a schematic diagram of the electrode assembly and gas storage structure of a soft-pack battery cell according to some embodiments of this application;

[0096] Figure 9 is a front view of the electrode assembly and gas storage structure of the pouch cell in Figure 8;

[0097] Figure 10 is a schematic diagram of a battery device according to some embodiments of this application;

[0098] Figure 11 is a schematic diagram of an electrical device according to some embodiments of this application.

[0099] Reference numerals: 100, pouch battery cell; 10, outer casing; 11, first casing wall; 12, receiving gap; 20, electrode assembly; 201, first surface; 21, electrode body; 211, main surface; 22, tab; 221, connection area; 222, assembly area; 23, lead-out component; 30, gas storage structure; 31, covering shell; 311, vent hole; 32, gas storage material; 40, first insulating layer; 50, second insulating layer; 51, first insulating part; 52, second insulating part; 200, battery assembly; 60, housing; 1000, electrical device; 300, vehicle body. Detailed Implementation

[0100] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0101] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0102] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0103] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0104] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0105] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0106] In this application, "multiple" means two or more (including two).

[0107] In the embodiments of this application, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined with each other to form new technical solutions.

[0108] In the embodiments of this application, unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0109] In embodiments of this application, the battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple pouch cell units, which are connected in series, parallel, or mixed connections via busbars. For example, a battery cell assembly is typically formed by arranging multiple pouch cell units; a battery cell assembly may also be a battery module, which is formed by arranging and fixing multiple pouch cell units into a single module. As an example, a battery module may be formed by bundling multiple battery cells together with cable ties.

[0110] The battery device can be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. The individual battery cells can be battery modules, which can be housed within the housing by securing the battery modules to the housing; alternatively, multiple pouch cells can be directly secured to the housing.

[0111] In embodiments of this application, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing for housing individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing for housing individual battery cells.

[0112] In embodiments of this application, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0113] In this embodiment, the pouch battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The pouch battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc. The pouch battery cell can be flat.

[0114] In related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. Based on the rigidity of their casing, batteries can be broadly classified into pouch batteries and hard-shell batteries. Pouch batteries have the advantages of higher mass / volume energy density and better safety, making their application increasingly widespread.

[0115] Pouch batteries generate a certain amount of gas during use, which increases the internal pressure. When this internal pressure increases to a certain level, there is a risk of thermal runaway, reducing battery life. Furthermore, the gas generated during pouch battery operation typically contains hydrogen; for example, alkali metal pouch batteries produce a higher amount of hydrogen. Hydrogen is a flammable and explosive gas, further increasing the risk of thermal runaway. Therefore, effectively controlling the internal pressure of individual pouch battery cells to reduce the risk of thermal runaway is a pressing technical problem that needs to be solved.

[0116] Based on this, this application proposes a pouch cell, including: a shell, an electrode assembly, and a gas storage structure. The electrode assembly is housed within the shell. A housing gap is defined between the electrode assembly and the shell in the thickness direction of the pouch cell. The gas storage structure is housed within the shell and located within the housing gap. At least a portion of the gas storage structure is a hydrogen storage metal.

[0117] In the above technical solution, by setting a gas storage structure inside the shell of the pouch battery cell, the gas generated during the operation of the pouch battery cell can be adsorbed and stored. For example, the hydrogen storage metal in the gas storage structure can adsorb and store the hydrogen generated during the operation of the pouch battery cell, thereby reducing the internal pressure inside the pouch battery cell, reducing the risk of thermal runaway, and helping to extend the battery's service life. Furthermore, by setting the gas storage structure on the large side of the pouch battery cell, the space on the large side of the pouch battery cell can be fully utilized, allowing for a larger size of the gas storage structure, thus giving it a greater gas storage capacity, which is even more conducive to extending the battery's service life.

[0118] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. Besides vehicles, the battery device can also be used in, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0119] The electrical devices disclosed in this application can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device is installed inside the vehicle, and the battery device can be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, the battery device can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery device to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this application, the battery device can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0120] The pouch cell 100 according to an embodiment of this application is described below with reference to Figures 1-9.

[0121] Referring to Figures 1-2, in a first aspect, this application provides a pouch cell 100, including: a housing 10, an electrode assembly 20, and a gas storage structure 30. Both the electrode assembly 20 and the gas storage structure 30 are housed within the housing 10. A receiving gap 12 is defined between the electrode assembly 20 and the housing 10 in the thickness direction of the pouch cell 100. The gas storage structure 30 is located within the receiving gap 12, and at least a portion of the gas storage structure 30 is a hydrogen storage metal.

[0122] The electrode assembly 20 may include an electrode body 21 and tabs 22, with the tabs 22 connected to one side of the electrode body 21 or to opposite sides of the electrode body 21. For example, the tabs 22 may include a positive tab 22 and a negative tab 22, which may be connected to the same side of the electrode body 21 or to opposite sides of the electrode body 21.

[0123] The pouch cell 100 also includes a lead 23, which is connected to the tab 22 of the electrode assembly 20. For example, the lead 23 can be soldered to the tab 22. The lead 23 is a conductive element, and at least a portion of the lead 23 is located outside the housing 10. The lead 23 serves as the electrode lead-out end of the pouch cell 100 and facilitates electrical connection between the pouch cell 100 and other pouch cells 100 or other components. For example, the lead 23 can be in the form of a sheet.

[0124] Correspondingly, lead-out element 23 also includes a positive lead-out element 23 and a negative lead-out element 23. The positive lead-out element 23 is connected to the positive electrode tab 22, and the negative lead-out element 23 is connected to the negative electrode tab 22.

[0125] The electrode assembly 20 includes a positive electrode, a negative electrode, and a separator located between the positive and negative electrode. The electrode assembly 20 can be a wound electrode assembly 20 or a stacked electrode assembly 20. The positive electrode includes a positive electrode body and a positive electrode tab 22 connected to the positive electrode body; the positive electrode body is coated with a positive active material layer. The negative electrode includes a negative electrode body and a negative electrode tab 22 connected to the negative electrode body; the negative electrode body is coated with a negative active material layer. The electrode body 21 includes a positive electrode body and a negative electrode body.

[0126] The housing 10 can be a flexible housing 10, for example, the housing 10 can be an aluminum-plastic film part.

[0127] For example, the pouch cell 100 can be flat and its outer contour is generally rectangular. The thickness direction of the pouch cell 100 refers to the direction containing the smallest dimension among its length, width, and height. For example, the thickness direction of the pouch cell 100 can be referred to as direction e1 in the attached drawing, the length direction of the pouch cell 100 can be referred to as direction e2 in the attached drawing, and the width direction of the pouch cell 100 can be referred to as direction e3 in the attached drawing.

[0128] Since the pouch cell 100 is usually flat, the accommodating gap 12 defined between the electrode assembly 20 and the outer casing 10 in the thickness direction of the pouch cell 100 is also a flat space. The gas storage structure 30 is accommodated in the accommodating gap 12, which can make full use of this flat space. For example, the shape of the gas storage structure 30 can be matched with the shape of the accommodating gap 12.

[0129] At least a portion of the gas storage structure 30 is a hydrogen storage metal; it can be a partial or complete hydrogen storage metal. The hydrogen storage metal can adsorb and store hydrogen. For example, when a portion of the gas storage structure 30 is a hydrogen storage metal, that portion can adsorb and store hydrogen, while the remaining portions of the gas storage structure 30, excluding the hydrogen storage metal, can adsorb and store other gases.

[0130] Hydrogen storage metals are metals that can react with hydrogen and absorb it. The reaction process between hydrogen storage metals and hydrogen is as follows: First, hydrogen is catalyzed and decomposed into hydrogen atoms on the surface of the hydrogen storage metal. Then, the hydrogen atoms enter the interior of the hydrogen storage metal lattice to form metal hydrides, thus achieving the purpose of hydrogen storage.

[0131] The hydrogen storage metal can absorb the hydrogen generated within the pouch cell 100. For example, the hydrogen absorption plateau pressure of the hydrogen storage metal can be adapted to the pouch cell 100, making it easier for the hydrogen storage metal to reach the hydrogen absorption plateau pressure within the pouch cell 100. This allows hydrogen to be absorbed at low pressure levels, i.e., when there is very little hydrogen, which can reduce the internal pressure of the pouch cell 100, reduce the risk of thermal runaway, and extend the lifespan of the pouch cell 100.

[0132] For example, by selecting the material of the hydrogen storage metal, the hydrogen absorption plateau pressure of the hydrogen storage metal can be achieved when the internal pressure of the soft-pack battery cell 100 is relatively low. By controlling the hydrogen absorption plateau pressure of the hydrogen storage metal to be low, the energy barrier for the combination of metal elements in the hydrogen storage metal and hydrogen atoms in the hydrogen gas is low. After the combination of each alloy element in the hydrogen storage metal and hydrogen atoms in the hydrogen gas, the structure of the hydrogen storage metal is stable after combining with hydrogen in the hydrogen gas.

[0133] Understandably, the material composition of the aforementioned hydrogen storage metal can be determined using an X-ray diffractometer.

[0134] Furthermore, this application incorporates a hydrogen storage metal within the pouch cell 100, which can directly absorb the hydrogen gas generated by the pouch cell 100. This reduces the probability of the hydrogen gas generated by the pouch cell 100 being discharged outside the pouch cell 100, further reducing the risk of battery thermal runaway. It also reduces the sensitivity of the pouch cell 100 to moisture, thereby improving the mechanical strength of the pouch cell 100 and further extending its lifespan.

[0135] In the above technical solution, by providing a gas storage structure 30 inside the outer casing 10 of the pouch battery cell 100, gases generated during the operation of the pouch battery cell 100 can be adsorbed and stored. For example, the hydrogen storage metal in the gas storage structure 30 can adsorb and store hydrogen generated during the operation of the pouch battery cell 100, thereby reducing the internal pressure inside the pouch battery cell 100, reducing the risk of thermal runaway, and extending the battery's lifespan. Furthermore, by placing the gas storage structure 30 on the large-area side of the pouch battery cell 100, the space on the large-area side of the pouch battery cell 100 can be fully utilized, allowing for a larger size of the gas storage structure 30, thus giving it a greater gas storage capacity and further extending the battery's lifespan. In addition, placing the gas storage structure 30 on the large-area side of the pouch battery cell 100 can also improve the overall rigidity of the pouch battery cell 100 and reduce its deformation.

[0136] In some embodiments of this application, under standard conditions, each gram of the hydrogen storage metal can absorb 50 mL to 250 mL of hydrogen gas. For example, under standard conditions, the volume of hydrogen gas absorbed by each gram of the hydrogen storage metal can be 50 mL to 240 mL, 100 mL to 200 mL, 150 mL to 179 mL, 155 mL to 175 mL, 160 mL to 170 mL, 165 mL to 170 mL, etc. This allows the hydrogen storage metal to absorb a relatively large amount of hydrogen, thus enabling sufficient absorption of hydrogen gas generated by the pouch cell 100 even with a low amount of hydrogen storage metal added, reducing the internal pressure of the pouch cell 100 and extending its lifespan. In other embodiments, under standard conditions, each gram of the hydrogen storage metal can absorb 50 mL to 180 mL of hydrogen gas.

[0137] As you can understand, standard temperature and pressure (STP), or simply "standard conditions" or "STP", refers to the conditions at 0°C and 101.325 kPa.

[0138] It is understood that "the volume of hydrogen that can be absorbed per gram of the hydrogen storage metal under standard conditions" is a well-known definition in the art and can be determined using methods known in the art, such as the following methods:

[0139] Add 1g of hydrogen storage metal to the stainless steel sample chamber. Purge the alloy with hydrogen at a constant pressure of 5MPa for 2 hours. Then evacuate the sample for 30 minutes. Repeat the hydrogen purging-evacuation process at least three times to fully activate the hydrogen storage metal.

[0140] The amount of hydrogen absorbed by the alloy was determined using the H2PCT-1153 three-channel fully automated hydrogen storage material performance testing system (Yangzhou Yinghui Zhiyue).

[0141] In some embodiments, referring to FIG2, the gas storage structure 30 is formed in a sheet-like shape, and the thickness direction of the gas storage structure 30 is consistent with the thickness direction of the soft-pack battery cell 100.

[0142] The thickness direction of the gas storage structure 30 refers to the thickness direction when the gas storage structure 30 is formed in a sheet-like shape.

[0143] The gas storage structure 30 is formed in a sheet-like shape, which may include the following: for example, the gas storage structure 30 is formed as a coating, such as the gas storage structure 30 being a coating formed on the electrode assembly 20, or the gas storage structure 30 being a coating formed on the outer shell 10; for example, the gas storage structure 30 is independently manufactured as a sheet or plate, and the sheet or plate-like gas storage structure 30 is installed into the aforementioned receiving gap 12.

[0144] In the above technical solution, by setting the gas storage structure 30 on the large side of the pouch battery cell 100 and setting the gas storage structure 30 in a layered shape, the flat space on the large side of the pouch battery cell 100 can be fully utilized. While making the size of the gas storage structure 30 larger, the size of the gas storage structure 30 in the thickness direction of the pouch battery cell 100 can be smaller, reducing the space occupied by the gas storage structure 30 in the thickness direction of the pouch battery cell 100. This makes the overall structure of the pouch battery cell 100 more compact. Setting the gas storage structure 30 inside the pouch battery cell 100 is also beneficial to making the energy density of the pouch battery cell 100 higher.

[0145] In some embodiments, referring to FIG3, at least a portion of the gas storage structure 30 is formed as a coating.

[0146] At least a portion of the gas storage structure 30 is formed as a coating, including cases where, for example, a portion of the gas storage structure 30 is formed as a coating, or the entire gas storage structure 30 is formed as a coating.

[0147] In the above technical solution, by setting at least a portion of the gas storage structure 30 as a coating structure, it is convenient to set the gas storage structure 30 inside the shell 10 of the soft-pack battery cell 100 by coating, which is also conducive to the large-area setting of the gas storage structure 30 and to improving the gas storage capacity of the gas storage structure 30.

[0148] In some embodiments, referring to FIG4, the gas storage structure 30 includes a shell 31 and a gas storage material 32 filled in the shell 31. At least a portion of the gas storage material 32 is a hydrogen storage metal. The gas storage material 32 is granular or powdered. The shell 31 has vent holes 311 formed on it, and the pore size of the vent holes 311 is smaller than the particle size of the gas storage material 32.

[0149] Gases such as hydrogen generated within the soft-pack battery cell 100 can enter the casing 31 through the vent 311 and come into contact with the gas storage material 32 located within the casing 31. The gas storage material 32 can adsorb and store hydrogen.

[0150] The casing 31 can be a metal casing or a plastic casing. When the casing 31 is a metal casing, it can be made of a hydrogen storage metal; when the casing 31 is a plastic casing, it can be made of a high-temperature resistant plastic material. Using a plastic casing for the casing 31 can also insulate the gas storage material 32 located inside the casing 31 from the electrode assembly 20 and / or the outer casing 10.

[0151] In the above technical solution, by setting the gas storage structure 30 to include a covering shell 31 and a gas storage material 32 in the form of granules or powder filled in the covering shell 31, the surface area of ​​the gas storage material 32 can be increased, the contact area between the gas storage material 32 and the gas can be increased, which is beneficial to improving the gas storage capacity of the gas storage structure 30, and also beneficial to enable the gas in the soft-pack battery cell 100 to be quickly adsorbed and stored in the gas storage material 32.

[0152] In some embodiments, referring to Figures 1-5, in the thickness direction of the pouch cell 100, the wall of the outer casing 10 facing the electrode assembly 20 is a first outer casing wall 11, the surface of the electrode assembly 20 facing the outer casing 10 is a first surface 201, and the gas storage structure 30 is fixed to the first outer casing wall 11 and / or the first surface 201.

[0153] The gas storage structure 30 is fixed to the first shell wall 11 and / or the first surface 201. For example, the gas storage structure 30 is connected to the first shell wall 11, the gas storage structure 30 is connected to the first surface 201, or the gas storage structure 30 is connected to both the first shell wall 11 and the first surface 201.

[0154] In the above technical solution, by fixing the gas storage structure 30 to the first surface 201 of the electrode assembly 20 and / or the first shell wall 11 of the outer shell 10, the gas storage structure 30 has a large fixed installation area, which facilitates the installation and fixing of the gas storage structure 30.

[0155] In some embodiments, referring to FIG2, the gas storage structure 30 is bonded and fixed to the first shell wall 11 and / or the first surface 201.

[0156] The gas storage structure 30 is bonded and fixed to the first shell wall 11 and / or the first surface 201. For example, the gas storage structure 30 is bonded to the first shell wall 11, the gas storage structure 30 is bonded to the first surface 201, or the gas storage structure 30 is bonded to both the first shell wall 11 and the first surface 201.

[0157] In the above technical solution, the gas storage structure 30 is bonded and fixed to the first shell wall 11 and / or the first surface 201. The bonding and fixing method is simple and easy to operate, which makes the installation and fixing operation of the gas storage structure 30 relatively simple.

[0158] In some embodiments, at least a portion of the gas storage structure 30 is formed as a coating applied to the first shell wall 11 and / or the first surface 201.

[0159] For example, at least a portion of the gas storage structure 30 is formed as a coating, the coating is applied to the first shell wall 11, the coating may be applied to the first surface 201, or the coating may be applied to both the first shell wall 11 and the first surface 201.

[0160] In the above technical solution, by setting the gas storage structure 30 as a coating applied to the first shell wall 11 and / or the first surface 201, the formation of the gas storage structure 30 can be simplified, and the surface area of ​​the gas storage structure 30 can be increased, which can increase the contact area between the gas storage structure 30 and the gas inside the shell 10, and is beneficial to improving the gas storage capacity of the gas storage structure 30.

[0161] In some embodiments, referring to FIG2, the pouch cell 100 includes a first insulating layer 40, at least a portion of which is located between the gas storage structure 30 and the first shell wall 11 and / or at least a portion of which is located between the gas storage structure 30 and the first surface 201.

[0162] At least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first shell wall 11 and / or at least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first surface 201, including the following situations: for example, at least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first shell wall 11; for another example, at least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first surface 201; for yet another example, a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first shell wall 11 and a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first surface 201.

[0163] The first insulating layer 40 can be an insulating adhesive layer or an insulating sheet layer. For example, the first insulating layer 40 can be an insulating adhesive.

[0164] In the above technical solution, by providing a first insulating layer 40 between the gas storage structure 30 and the first shell wall 11 and / or by providing a first insulating layer 40 between the gas storage structure 30 and the first surface 201 of the electrode assembly 20, the gas storage structure 30 can be insulated from the shell 10 and / or the electrode assembly 20, thereby preventing the gas storage structure 30 from forming an electrical conduction path between the shell 10 and the electrode assembly 20, and improving the reliability of the soft-pack battery cell 100.

[0165] In some embodiments, the projection of the gas storage structure 30 along the thickness direction of the pouch cell 100 lies within the projection of the first insulating layer 40 along the thickness direction of the pouch cell 100.

[0166] For example, taking a plane perpendicular to the thickness direction of the pouch cell 100 as a reference plane, the projection of the gas storage structure 30 on the reference plane is located within the projection of the first insulating layer 40 on the reference plane, and the projected area of ​​the gas storage structure 30 on the reference plane can be smaller than the projected area of ​​the first insulating layer 40 on the reference plane.

[0167] In the above technical solution, by making the projection of the gas storage structure 30 along the thickness direction of the soft-pack battery cell 100 lie within the projection of the first insulating layer 40 along the thickness direction of the soft-pack battery cell 100, the first insulating layer 40 can completely cover the gas storage structure 30 in the thickness direction of the soft-pack battery cell 100. This can better isolate the gas storage structure 30 from the outer casing 10 and / or the electrode assembly 20, thereby better preventing the gas storage structure 30 from forming an electrical conduction path between the outer casing 10 and the electrode assembly 20, and better improving the reliability of the soft-pack battery cell 100.

[0168] In some embodiments, the first insulating layer 40 is a double-sided adhesive layer, and the gas storage structure 30 is bonded and fixed to the first shell wall 11 and / or the first surface 201 through the first insulating layer 40.

[0169] The first insulating layer 40 is a double-sided adhesive layer, thus providing adhesive layers on both sides of its thickness direction. When the first insulating layer 40 is disposed between the gas storage structure 30 and the first shell wall 11, the adhesive layers on both sides of the first insulating layer 40 in the thickness direction can be bonded to the gas storage structure 30 and the first shell wall 11, respectively. When the first insulating layer 40 is disposed between the gas storage structure 30 and the first surface 201, the adhesive layers on both sides of the first insulating layer 40 in the thickness direction can be bonded to the gas storage structure 30 and the first surface 201, respectively.

[0170] In the above technical solution, by setting the first insulating layer 40 as a double-sided adhesive layer, the gas storage structure 30 is bonded and fixed to the first shell wall 11 and / or the first surface 201 through the first insulating layer 40. In this way, the first insulating layer 40 can not only serve to insulate and separate the gas storage structure 30 from the shell 10 and / or the electrode assembly 20, but also serve to bond and fix the gas storage structure 30, which can eliminate the need to set a separate adhesive layer for bonding and fixing the gas storage structure 30.

[0171] In some embodiments, the gas storage structure 30 is fixed to the first insulating layer 40.

[0172] In the above technical solution, fixing the gas storage structure 30 to the first insulating layer 40 can integrate the gas storage structure 30 and the first insulating layer 40 into one unit. For example, the gas storage structure 30 and the first insulating layer 40 can be bonded and fixed, and then the gas storage structure 30 and the first insulating layer 40 can be fixed together on the electrode assembly 20 or the outer shell 10, which is convenient for installation and fixing.

[0173] In some embodiments, referring to Figures 5-7, the electrode assembly 20 includes an electrode body 21 and tabs 22. The tabs 22 are connected to one side or opposite sides of the electrode body 21. In the thickness direction of the pouch cell 100, the tabs 22 define at least a portion of the receiving gap 12 between the housing 10 and the outer casing 10.

[0174] The tab 22 defines at least a portion of the receiving gap 12 between the tab 22 and the housing 10, for example, the tab 22 defines a portion of the receiving gap 12 between the tab 22 and the housing 10, or the tab 22 defines the entire receiving gap 12 between the tab 22 and the housing 10.

[0175] In the above technical solution, by defining at least a portion of the accommodating gap 12 between the electrode tab 22 of the electrode assembly 20 and the outer shell 10, the gap between the electrode tab 22 of the electrode assembly 20 and the outer shell 10 can be fully utilized to accommodate the gas storage structure 30, making the overall structure of the soft-pack battery cell 100 compact. While setting the gas storage structure 30 inside the soft-pack battery cell 100, it is beneficial to make the energy density of the soft-pack battery cell 100 higher.

[0176] In some embodiments, referring to Figures 5-7, the tab 22 is provided with a gas storage structure 30.

[0177] The tab 22 is provided with a gas storage structure 30, which may include the following situations: all the gas storage structures 30 in the soft-pack battery cell 100 are provided on the tab 22, or part of the gas storage structures 30 in the soft-pack battery cell 100 are provided on the tab 22, and the other part of the gas storage structure 30 can be provided on the electrode body 21.

[0178] In the above technical solution, by setting a gas storage structure 30 on the tab 22, it is convenient to install and fix the gas storage structure 30, and also convenient to assemble the soft-pack battery cell 100. For example, by installing a gas storage structure 30 on the tab 22, the gas storage structure 30 and the electrode assembly 20 are integrated into a whole, making it convenient to assemble the electrode assembly 20 and the gas storage structure 30 together into the outer casing 10.

[0179] In some embodiments, referring to Figures 5-7, the pouch cell 100 further includes a lead-out member 23, at least a portion of which is located outside the housing 10. The tab 22 includes a connection area 221 and an assembly area 222. The lead-out member 23 is connected to the connection area 221. In the thickness direction of the pouch cell 100, the surface of the electrode assembly 20 facing the housing 10 is a first surface 201. The first surface 201 includes the assembly area 222, which faces the receiving gap 12. The assembly area 222 is provided with a gas storage structure 30.

[0180] Assembly area 222 is provided with gas storage structure 30, which may include the following situations: all gas storage structures 30 in the soft pack battery cell 100 are set in assembly area 222, or part of the gas storage structures 30 in the soft pack battery cell 100 are set in assembly area 222, and the other part of the gas storage structure 30 can be set on electrode body 21.

[0181] In the above technical solution, by setting the gas storage structure 30 provided on the tab 22 in the assembly area 222 of the tab 22, the assembly area 222 of the tab 22 can be fully utilized to install and fix the gas storage structure 30, and the at least part of the accommodating gap 12 formed between the assembly area 222 and the outer shell 10 can be fully utilized to accommodate the gas storage structure 30. This can reduce the extra space occupied by the gas storage structure 30 inside the soft-pack battery cell 100, making the structure of the soft-pack battery cell 100 more compact.

[0182] In some embodiments, the ratio of the area of ​​the gas storage structure 30 covering the assembly area 222 to the area of ​​the assembly area 222 is greater than 0.6.

[0183] The area covered by the gas storage structure 30 in the assembly area 222 refers to the area covered by the gas storage structure 30 in the assembly area 222.

[0184] For example, the ratio of the area of ​​the gas storage structure 30 covering the assembly area 222 to the area of ​​the assembly area 222 can be 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0185] In the above technical solution, by making the ratio of the area of ​​the gas storage structure 30 covering the assembly area 222 to the area of ​​the assembly area 222 greater than 0.6, the area of ​​the gas storage structure 30 covering the assembly area 222 can be larger, thereby making the size and surface area of ​​the gas storage structure 30 larger, which can improve the gas storage capacity of the gas storage structure 30.

[0186] In some embodiments, referring to Figures 6-7, the gas storage structure 30 provided in the assembly area 222 is located within the assembly area 222.

[0187] The gas storage structure 30 located in the assembly area 222 is located within the assembly area 222. This can be understood as the projection of the gas storage structure 30 located in the assembly area 222 onto the reference plane being located within the projection of the assembly area 222 onto the reference plane.

[0188] In the above technical solution, by placing the gas storage structure 30 in the assembly area 222 within the assembly area 222, the gas storage structure 30 can fully utilize the assembly area 222 as a support carrier while ensuring that the gas storage structure 30 does not extend beyond the outer edge of the assembly area 222. This prevents the gas storage structure 30 from occupying additional space beyond the outer edge of the assembly area 222, thereby reducing interference between the gas storage structure 30 in the assembly area 222 and other components within the outer casing 10, and minimizing the impact of the gas storage structure 30 in the assembly area 222 on the placement of other components within the outer casing 10.

[0189] In some embodiments, referring to Figures 6-7, in the thickness direction of the soft-pack battery cell 100, the surface of the electrode body 21 facing the outer casing 10 is the main surface 211, the first surface 201 includes the main surface 211, and the gas storage structure 30 disposed in the assembly area 222 is located between the plane where the assembly area 222 and the main surface 211 are located.

[0190] For example, the plane on which the main surface 211 is located is the first plane, and the gas storage structure 30 located in the assembly area 222 is located between the assembly area 222 and the first plane.

[0191] In the above technical solution, by ensuring that the gas storage structure 30 disposed in the assembly area 222 does not extend beyond the surface of the electrode body 21 facing the outer casing 10 in the thickness direction of the soft-pack battery cell 100, the gas storage structure 30 disposed in the assembly area 222 will not occupy additional space in the thickness direction of the soft-pack battery cell 100. That is, the gas storage structure 30 disposed in the assembly area 222 will not increase the thickness of the soft-pack battery cell 100, which is beneficial to improving the energy density of the soft-pack battery cell 100.

[0192] In some embodiments, referring to Figures 6-7, the gas storage structure 30 located in the assembly area 222 is spaced apart from the electrode body 21.

[0193] For example, in the arrangement direction of the tab 22 and the electrode body 21 (refer to the length direction e2 of the soft-pack battery cell 100 in the attached figure), the gas storage structure 30 provided in the assembly area 222 is spaced apart from the electrode body 21.

[0194] The gas storage structure 30 disposed in the assembly area 222 is spaced apart from the electrode body 21, which may include the following situations: for example, there is a gap between the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21; or, the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21 are separated by an insulating spacer layer.

[0195] In the above technical solution, by making the gas storage structure 30 disposed in the assembly area 222 spaced apart from the electrode body 21, the short circuit between multiple electrodes of the electrode body 21 caused by the gas storage structure 30 disposed in the assembly area 222 contacting the electrode body 21 can be reduced or avoided, thereby improving the reliability of the soft-pack battery cell 100.

[0196] In some embodiments, referring to Figures 6-7, the pouch cell 100 includes a second insulating layer 50, at least a portion of which is located between the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21.

[0197] At least a portion of the second insulating layer 50 is located between the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21. This can be either a portion of the second insulating layer 50 being located between the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21, or the entire second insulating layer 50 being located between the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21.

[0198] The second insulating layer 50 can be insulating adhesive or insulating sheet. For example, the second insulating layer 50 can be insulating adhesive paper.

[0199] In the above technical solution, by providing a second insulating layer 50 between the gas storage structure 30 in the assembly area 222 and the electrode body 21, the gas storage structure 30 in the assembly area 222 can be better insulated from the electrode body 21, which can better reduce or avoid short circuits between multiple electrodes of the electrode body 21 caused by the gas storage structure 30 in the assembly area 222 contacting the electrode body 21, thereby improving the reliability of the soft-pack battery cell 100.

[0200] In some embodiments, referring to Figures 6-7, the second insulating layer 50 includes a first insulating portion 51 and a second insulating portion 52 connected together. The first insulating portion 51 is located between the gas storage structure 30 and the electrode body 21. The surface of the electrode body 21 facing the outer shell 10 is the main surface 211. The first surface 201 includes the main surface 211, and the second insulating portion 52 is located on the main surface 211.

[0201] The first insulating part 51 and the second insulating part 52 can be arranged at an angle, for example, the first insulating part 51 and the second insulating part 52 can be arranged substantially perpendicularly.

[0202] In the above technical solution, by setting the second insulating layer 50 to include a first insulating part 51 and a second insulating part 52, and setting the first insulating part 51 between the gas storage structure 30 and the electrode body 21, the first insulating part 51 can insulate the gas storage structure 30 provided in the assembly area 222 from the electrode body 21, and the second insulating part 52 of the second insulating layer 50 is located on the main surface 211 of the electrode body 21, that is, the second insulating layer 50 extends from the side of the electrode body 21 adjacent to the assembly area 222 to the main surface 211 of the electrode body 21. This allows the second insulating layer 50 to completely cover the side of the electrode body 21 adjacent to the assembly area 222, which can better insulate the gas storage structure 30 provided in the assembly area 222 from the electrode body 21, and can also make the second insulating layer 50 and the electrode body 21 have a larger contact area, thereby facilitating the fixing of the second insulating layer 50 to the electrode body 21, and making the connection and fixation between the second insulating layer 50 and the electrode body 21 more stable.

[0203] In some embodiments, referring to Figures 6-7, the pouch cell 100 includes a first insulating layer 40, the wall of the outer casing 10 facing the electrode assembly 20 is a first shell wall 11, and at least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the assembly area 222 or at least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first shell wall 11.

[0204] At least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the assembly area 222, which can achieve insulation between the tab 22 and the outer casing 10.

[0205] At least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first shell wall 11, which can achieve insulation between the tab 22 and the outer shell 10.

[0206] In the above technical solution, by providing a first insulating layer 40 between the gas storage structure 30 disposed in the assembly area 222 and the assembly area 222 and / or by providing a first insulating layer 40 between the gas storage structure 30 and the first shell wall 11, the gas storage structure 30 disposed in the assembly area 222 can be insulated from the outer shell 10 and / or the tab 22, thereby preventing the gas storage structure 30 from forming an electrical conduction path between the outer shell 10 and the tab 22, and improving the reliability of the soft-pack battery cell 100.

[0207] In some embodiments, in the thickness direction of the pouch cell 100, the projection of the first insulating layer 40 opposite to the assembly region 222 in the assembly region 222 is located within the assembly region 222, and the projection of the gas storage structure 30 opposite to the assembly region 222 in the assembly region 222 is located within the projection of the corresponding first insulating layer 40 in the assembly region 222.

[0208] In the above technical solution, by making the first insulating layer 40 located within the assembly area 222 without extending beyond the outer edge of the assembly area 222, the first insulating layer 40 located in the assembly area 222 will not occupy additional space beyond the outer edge of the assembly area 222. This can reduce the interference between the first insulating layer 40 located in the assembly area 222 and other components within the housing 10, and reduce the impact of the first insulating layer 40 located in the assembly area 222 on the arrangement of other components within the housing 10.

[0209] Furthermore, the projection of the gas storage structure 30 opposite to the assembly area 222 in the assembly area 222 is located within the projection of the corresponding first insulating layer 40 in the assembly area 222. In this way, the first insulating layer 40 can completely cover the gas storage structure 30 in the thickness direction of the pouch battery cell 100, thereby better insulating the gas storage structure 30 from the outer casing 10 and / or the tab 22. This can better prevent the gas storage structure 30 from forming an electrical conduction path between the outer casing 10 and the tab 22, thus improving the reliability of the pouch battery cell 100. At the same time, the gas storage structure 30 opposite to the assembly area 222 will not occupy additional space beyond the outer edge of the assembly area 222. This can reduce the interference between the gas storage structure 30 in the assembly area 222 and other components in the outer casing 10, and reduce the impact of the gas storage structure 30 in the assembly area 222 on the arrangement of other components in the outer casing 10.

[0210] In some embodiments, referring to Figures 6-7, at least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the assembly area 222. The pouch cell 100 also includes a second insulating layer 50, at least a portion of which is located between the gas storage structure 30 and the electrode body 21. The second insulating layer 50 is connected to the first insulating layer 40 and integrally formed.

[0211] In the above technical solution, by providing a first insulating layer 40 between the gas storage structure 30 disposed in the assembly area 222 and the assembly area 222, the gas storage structure 30 can be insulated from the outer casing 10 and / or the electrode tab 22, thereby better preventing the gas storage structure 30 from forming an electrical conduction path between the outer casing 10 and the electrode tab 22, and improving the reliability of the soft-pack battery cell 100. Furthermore, by providing a second insulating layer 50 between the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21, the gas storage structure 30 disposed in the assembly area 222 can be insulated from the electrode body 21, reducing or avoiding short circuits between multiple electrodes of the electrode body 21 caused by contact between the gas storage structure 30 disposed in the assembly area 222 and the electrode body 21, thus improving the reliability of the soft-pack battery cell 100. In addition, by integrally molding the first insulating layer 40 and the second insulating layer 50, the first insulating layer 40 and the second insulating layer 50 are formed as a whole, facilitating the installation and fixing of the first insulating layer 40 and the second insulating layer 50.

[0212] In some embodiments, referring to Figures 8-9, the electrode assembly 20 includes an electrode body 21 and tabs 22. The tabs 22 are connected to one side or opposite sides of the electrode body 21. In the thickness direction of the pouch cell 100, at least a portion of the receiving gap 12 is defined between the electrode body 21 and the housing 10.

[0213] The electrode body 21 and the outer casing 10 define at least a portion of the receiving gap 12, for example, a portion of the receiving gap 12 between the electrode body 21 and the outer casing 10, or the entire receiving gap 12 between the electrode body 21 and the outer casing 10.

[0214] In the above technical solution, by defining at least a portion of the accommodating gap 12 between the electrode body 21 and the outer shell 10 in the thickness direction of the soft-pack battery cell 100, the large flat space between the electrode body 21 and the outer shell 10 can be fully utilized to accommodate the gas storage structure 30, which can make the size of the gas storage structure 30 larger, thereby making the gas storage structure 30 have a larger gas storage capacity, which is more conducive to extending the service life of the battery.

[0215] In some embodiments, referring to Figures 8-9, the surface of the electrode body 21 facing the receiving gap 12 is the main surface 211, and the main surface 211 is provided with a gas storage structure 30.

[0216] The main surface 211 is provided with a gas storage structure 30, which may include the following situations: all the gas storage structures 30 in the soft-pack battery cell 100 are provided on the main surface 211, or a part of the gas storage structures 30 in the soft-pack battery cell 100 are provided on the main surface 211, and the other part of the gas storage structure 30 can be provided on the tab 22.

[0217] In the above technical solution, the gas storage structure 30 is installed and fixed on the main surface 211 of the electrode body 21. The large area of ​​the main surface 211 of the electrode body 21 facilitates the installation and fixing of the gas storage structure 30, and also makes the fixing area between the gas storage structure 30 and the electrode body 21 larger, making the fixing of the gas storage structure 30 more stable.

[0218] In some embodiments, the ratio of the area of ​​the gas storage structure 30 covering the main surface 211 to the area of ​​the main surface 211 is greater than 0.6.

[0219] The area of ​​the gas storage structure 30 covering the main surface 211 refers to the area of ​​the gas storage structure 30 covering the main surface 211.

[0220] For example, the ratio of the area of ​​the gas storage structure 30 covering the main surface 211 to the area of ​​the main surface 211 can be 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0221] In the above technical solution, by making the ratio of the area of ​​the gas storage structure 30 covering the main surface 211 to the area of ​​the main surface 211 greater than 0.6, the area of ​​the gas storage structure 30 covering the main surface 211 can be larger, thereby making the size and surface area of ​​the gas storage structure 30 larger, which can improve the gas storage capacity of the gas storage structure 30.

[0222] In some embodiments, referring to Figures 8-9, the gas storage structure 30 disposed on the main surface 211 is located within the main surface 211.

[0223] The gas storage structure 30 located on the main surface 211 is located within the main surface 211. This can be understood as the projection of the gas storage structure 30 on the reference plane being located within the projection of the main surface 211 on the reference plane.

[0224] In the above technical solution, by making the gas storage structure 30 disposed on the main surface 211 located within the main surface 211, the gas storage structure 30 fully utilizes the main surface 211 as a supporting carrier, while ensuring that the gas storage structure 30 disposed on the main surface 211 does not extend beyond the outer edge of the main surface 211. Thus, the gas storage structure 30 disposed on the main surface 211 does not occupy additional space beyond the outer edge of the main surface 211. This reduces interference between the gas storage structure 30 disposed on the main surface 211 and other components within the outer casing 10, and reduces the impact of the gas storage structure 30 disposed on the main surface 211 on the placement of other components within the outer casing 10.

[0225] In some embodiments, referring to Figures 8-9, the pouch cell 100 includes a first insulating layer 40. In the thickness direction of the pouch cell 100, the wall of the outer casing 10 facing the electrode assembly 20 is a first shell wall 11, and the surface of the electrode body 21 facing the receiving gap 12 is a main surface 211. At least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first shell wall 11 or at least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the main surface 211.

[0226] At least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the first shell wall 11, which can achieve insulation between the electrode body 21 and the outer shell 10.

[0227] At least a portion of the first insulating layer 40 is located between the gas storage structure 30 and the main surface 211, which can achieve insulation between the electrode body 21 and the outer shell 10.

[0228] In the above technical solution, by providing a first insulating layer 40 between the gas storage structure 30 and the first shell wall 11 and / or between the gas storage structure 30 and the main surface 211 of the electrode body 21, the gas storage structure 30 can be insulated from the shell 10 and / or the electrode body 21, thereby better preventing the gas storage structure 30 from forming an electrical conduction path between the shell 10 and the electrode body 21, and better improving the reliability of the soft-pack battery cell 100.

[0229] In some embodiments, referring to Figures 8-9, in the thickness direction of the pouch cell 100, the projection of the first insulating layer 40 opposite to the main surface 211 on the main surface 211 is located within the main surface 211, and the projection of the gas storage structure 30 opposite to the main surface 211 on the main surface 211 is located within the projection of the corresponding first insulating layer 40 on the main surface 211.

[0230] For example, in the example of Figure 9, the main surface 211 has a dimension L1 in the length direction of the pouch cell 100, and a dimension W1 in the width direction of the pouch cell 100. The first insulating layer 40 opposite to the main surface 211 has a dimension L2 in the length direction of the pouch cell 100, and a dimension W2 in the width direction of the pouch cell 100. The gas storage structure 30 opposite to the main surface 211 has a dimension L3 in the length direction of the pouch cell 100, and a dimension W3 in the width direction of the pouch cell 100. Wherein, L3 ≤ L2 ≤ L1, and W3 ≤ W2 ≤ W1.

[0231] In the above technical solution, the projection of the gas storage structure 30 opposite to the main surface 211 on the main surface 211 is located within the projection of the corresponding first insulating layer 40 on the main surface 211. In this way, in the thickness direction of the soft-pack battery cell 100, the first insulating layer 40 can completely cover the gas storage structure 30, thereby better insulating the gas storage structure 30 from the outer casing 10 and / or the electrode body 21. This can better prevent the gas storage structure 30 from forming an electrical conduction path between the outer casing 10 and the electrode body 21, thus improving the reliability of the soft-pack battery cell 100. At the same time, the gas storage structure 30 opposite to the main surface 211 will not occupy additional space beyond the outer edge of the main surface 211. This can reduce the interference between the gas storage structure 30 on the main surface 211 and other components inside the outer casing 10, and reduce the impact of the gas storage structure 30 on the main surface 211 on the arrangement of other components inside the outer casing 10.

[0232] In some embodiments, the pouch cell 100 is configured as an alkali metal battery.

[0233] Alkali metal batteries are batteries that achieve cycling by depositing and consuming alkali metals at the negative electrode. When preparing the negative electrode, an alkali metal layer may or may not be formed (a battery without a negative electrode). In addition, the active metals in alkali metal batteries are not limited to lithium, sodium, and potassium, but may also include other active metals such as zinc and aluminum.

[0234] In the above technical solution, by setting the soft-pack battery cell 100 as an alkali metal battery, the soft-pack battery cell 100 can have a high energy density. Furthermore, by setting a gas storage structure 30 on the large side of the soft-pack battery cell 100, the gas generated during the operation of the soft-pack battery cell 100, such as hydrogen, can be absorbed and stored, thereby reducing the internal pressure of the soft-pack battery cell 100.

[0235] In some embodiments, the electrode assembly 20 includes a negative electrode sheet, which includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

[0236] Active metals refer to metals that can provide active metal ions. For example, the active metal in lithium-alkali metal batteries is elemental lithium, and the active metal in sodium-alkali metal batteries is elemental sodium. Specifically, alkali metal batteries are batteries that use active metals as the negative electrode, such as lithium metal and sodium metal. In these types of alkali metal batteries, the active metal ions on the negative electrode, such as lithium and sodium, are relatively active and will undergo side reactions with water, solvents in the electrolyte, and residual alkali in the positive electrode active material, resulting in a large amount of gas production, with hydrogen accounting for >90% of the gas. For batteries that mainly produce hydrogen gas, by incorporating a hydrogen storage metal into the battery, the hydrogen gas produced in the pouch cell 100 can be absorbed, reducing the excessive internal pressure of the pouch cell 100, with better results. The cycle life of the pouch cell 100 is significantly improved.

[0237] In the above technical solution, by making the active material layer of the negative electrode sheet include active metal elements, the soft-pack battery cell 100 can have a high energy density. Since the active metal elements will react with the electrolyte in the soft-pack battery cell 100 to produce gas, such as a large amount of hydrogen, by setting a gas storage structure 30 on the large side of the soft-pack battery cell 100, the gas, such as hydrogen, generated during the operation of the soft-pack battery cell 100 can be absorbed and stored, thereby reducing the internal pressure of the soft-pack battery cell 100.

[0238] In some embodiments of this application, the active material layer comprises an alloy formed of an active metal, and the lithium metal battery comprises a lithium metal alloy with the chemical formula LiR, wherein R comprises at least one of tin, zinc, aluminum, magnesium, silver, gold, gallium, indium, platinum, boron, carbon, or silicon.

[0239] In some embodiments of this application, when a lithium metal negative electrode sheet is used, the preparation method is as follows: lithium foil or lithium metal alloy is coated onto the current collector by single-sided rolling, and then cut into negative electrode sheets.

[0240] In some other embodiments of this application, the sodium metal battery includes a sodium metal alloy with the chemical formula NaR1, wherein R1 includes at least one of tin, zinc, aluminum, magnesium, silver, gold, gallium, indium, platinum, boron, carbon, or silicon.

[0241] In some other embodiments of this application, when a sodium metal negative electrode sheet is used, the preparation method is as follows: sodium foil or sodium metal alloy is coated onto the current collector by single-sided rolling, and then cut into negative electrode sheets.

[0242] In some embodiments of this application, the negative electrode sheet includes a negative current collector and an interface modification layer disposed on at least one side of the negative current collector. The interface modification layer includes a first binder and a conductive agent. That is, the negative electrode sheet does not contain alkali metal, and the prepared battery is called a negative electrode-free battery. The setting of the interface modification layer can make the active metal (alkali metal) uniformly deposited on the surface of the interface modification layer, thereby improving the cycle performance of the battery.

[0243] It's understandable that a "negative electrode-free battery" refers to a battery where no negative electrode active material is added during the battery manufacturing stage. However, a negative electrode current collector is still present. A negative electrode-free battery is simply a special type of alkali metal battery (such as lithium metal batteries or sodium metal batteries), not one that truly lacks a negative electrode. In actual operation, the negative electrode still contains an active metal (such as lithium metal or sodium metal). The negative electrode in a negative electrode-free battery includes a bare negative electrode current collector (such as copper). Taking a lithium battery as an example, during charging, active metal ions such as Li+ are released from the positive electrode and deposited on the negative electrode current collector, forming a lithium negative electrode. During subsequent battery discharge, the deposited lithium metal dissolves and is re-intercalated into the positive electrode.

[0244] In some embodiments, the active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum.

[0245] For example, alkali metal batteries include at least one of lithium metal batteries, sodium metal batteries, potassium metal batteries, zinc metal batteries, or aluminum metal batteries.

[0246] In the above technical solution, by using an elemental active metal, including at least one of lithium, sodium, potassium, zinc, or aluminum, which is relatively reactive and will undergo side reactions with the electrolyte, producing a large amount of gas with a hydrogen content greater than 90%, the hydrogen generated in the soft-pack battery cell 100, which mainly produces hydrogen gas, is absorbed and stored by setting a gas storage structure 30 on the large side of the soft-pack battery cell 100. This improves the effect of reducing the internal pressure of the soft-pack battery cell 100 and significantly improves the cycle life of the soft-pack battery cell 100.

[0247] In some embodiments, the electrolyte of the pouch cell 100 includes a solvent, which is configured as at least one of an ether solvent or an ester solvent.

[0248] Ether solvents are organic solvents containing ether groups, while ester solvents are organic solvents containing ester groups.

[0249] In the above technical solution, by setting the solvent in the electrolyte of the soft-pack battery cell 100 to at least one of ether solvent or ester solvent, the ether solvent and ester solvent have good compatibility with the hydrogen storage metal in the gas storage structure 30, and hydrogen gas is generated during the cycle of the soft-pack battery cell 100. The generated hydrogen gas can be better absorbed and stored by the hydrogen storage metal, reducing the internal pressure of the soft-pack battery cell 100 and extending the life of the soft-pack battery cell 100.

[0250] In some embodiments, the solvent includes ether solvents, which include at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane.

[0251] In the above technical solution, by including the above-mentioned solvent in the ether solvent, the ether solvent has good compatibility with the hydrogen storage metal in the gas storage structure 30, and hydrogen is generated during the cycle of the soft-pack battery cell 100. The generated hydrogen can be better absorbed and stored by the hydrogen storage metal, reducing the internal pressure of the soft-pack battery cell 100 and extending the life of the soft-pack battery cell 100.

[0252] In some embodiments of this application, the density of the hydrogen storage metal is 3 g / cm³. 2 ~8.5g / cm 2 For example, the density of hydrogen storage metals can be 3 g / cm³. 2 ~8.4g / cm 2 4g / cm 2 ~8.3g / cm 2 5g / cm 2 ~8.2g / cm 2 6g / cm 2 ~8.1g / cm 2 7g / cm 2 ~8g / cm 2 By controlling the density of the hydrogen storage metal within the above range, the hydrogen absorption capacity of the metal can be improved, allowing it to fully absorb the hydrogen produced by the alkali metal battery, reducing the internal pressure of the pouch cell 100, and extending its lifespan. Furthermore, it can reduce the impact of excessively high density on the energy density of the pouch cell 100.

[0253] It is understood that the "density of hydrogen storage metals" is a well-known definition in the art and can be determined using methods known in the art, such as the following methods:

[0254] The density was measured using an INSTRUQUEST IQIPYC true density meter (USA).

[0255] In some embodiments of this application, the operating temperature of the hydrogen storage metal is -40℃ to 60℃. For example, the operating temperature of the hydrogen storage metal can be -40℃ to 59℃, -30℃ to 50℃, -20℃ to 40℃, -10℃ to 30℃, 0℃ to 20℃, 10℃ to 15℃, etc. Specifically, the operating temperature of the hydrogen storage metal refers to the temperature at which the hydrogen storage metal can absorb hydrogen gas. Controlling the operating temperature of the hydrogen storage metal within the above range allows the battery to adapt to low-temperature and high-temperature operating environments, reduces the internal pressure of the pouch battery cell 100, and extends the life of the pouch battery cell 100. In other embodiments of this application, the operating temperature of the hydrogen storage metal is 0℃ to 45℃.

[0256] In some embodiments, the hydrogen storage metal includes at least one of zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or LaxNiyMz, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca, or Bi, and 0 < x ≤ 2, 0 ≤ y ≤ 7, and 0 ≤ z ≤ 3.

[0257] Zirconium alloys are alloys containing zirconium, magnesium alloys are alloys containing magnesium, titanium alloys are alloys containing titanium, and vanadium alloys are alloys containing vanadium.

[0258] Among the aforementioned elements, Ti and Co can improve the lifespan and kinetics of hydrogen storage metals, Mg can enhance the hydrogen absorption capacity of hydrogen storage metals, Mn and Al can construct the framework of hydrogen storage metals and reduce costs, Y can reduce the hydrogen absorption plateau pressure of hydrogen storage metals, Fe, Ca and Bi can increase the hydrogen desorption plateau pressure of hydrogen storage metals, and Fe can increase the hydrogen absorption plateau pressure of hydrogen storage metals, while Cu can increase the hydrogen absorption rate of hydrogen storage metals.

[0259] In the above technical solution, by including at least one of zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or LaxNiyMz as the hydrogen storage metal, the hydrogen storage metal can have better hydrogen absorption capacity and hydrogen absorption effect.

[0260] In some embodiments, M includes at least one of Al, Mn, Mg, Fe, Y, or Bi, and 0.3 ≤ x ≤ 1, 1 ≤ y ≤ 5, 0 ≤ z ≤ 1; or titanium alloys include at least one of TiNi, Ti2Ni, TiFe, or TiMn2; or magnesium alloys include at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr, or Mg2Te; or zirconium alloys include at least one of ZrV2, ZrCr2, or ZrMn2; or vanadium alloys include V3TiNi. 0.56 M1m, m = 0.046-0.24, M1 includes at least one of Al, Si, Fe, Cu or Zr.

[0261] In the above technical solution, by including at least one of Al, Mn, Mg, Fe, Y or Bi, the above hydrogen storage metal has the characteristics of fast hydrogen absorption, large hydrogen absorption capacity, wide hydrogen absorption boundary and small volume expansion, and has excellent hydrogen absorption capacity. This allows the hydrogen storage metal to have good hydrogen absorption capacity and effect, absorb the hydrogen gas generated by the battery, reduce the internal pressure of the soft-pack battery cell 100, reduce the risk of thermal runaway of the soft-pack battery cell 100, and extend the life of the soft-pack battery cell 100.

[0262] In some embodiments of this application, the titanium alloy includes at least one of TiNi, Ti2Ni, TiFe, or TiMn2. The above-mentioned titanium alloy has excellent hydrogen absorption capacity, which can absorb hydrogen gas generated by the battery, reduce the internal pressure of the alkali metal battery, reduce the risk of thermal runaway of the alkali metal battery, and extend the life of the alkali metal battery.

[0263] In some embodiments of this application, the magnesium alloy includes at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr or Mg2Te. The above-mentioned magnesium alloy has excellent hydrogen absorption capacity, which can absorb hydrogen gas generated by the battery, reduce the internal pressure of the soft-pack battery cell 100, reduce the risk of thermal runaway of the soft-pack battery cell 100, and extend the life of the soft-pack battery cell 100.

[0264] In some embodiments of this application, the zirconium alloy includes at least one of ZrV2, ZrCr2, or ZrMn2. The zirconium alloy has excellent hydrogen absorption capacity, which can absorb hydrogen generated by the battery, reduce the internal pressure of the pouch cell 100, reduce the risk of thermal runaway of the pouch cell 100, and extend the life of the pouch cell 100.

[0265] In some embodiments of this application, the vanadium alloy includes V3TiNi. 0.56 M1 mThe vanadium alloy with the above chemical formula has excellent hydrogen absorption capacity, which can absorb hydrogen gas generated by the battery, reduce the internal pressure of the soft-pack battery cell 100, reduce the risk of thermal runaway of the soft-pack battery cell 100, and extend the life of the soft-pack battery cell 100. m = 0.046-0.24, and M1 includes at least one of Al, Si, Fe, Cu or Zr. For example, m can be 0.046-0.24, and M1 can be at least one of Al, Si, Fe, Cu or Zr.

[0266] In some embodiments, hydrogen storage metals include LaNi 3.5 M2 x1 M3 y1 M4 z1 Where x1 is 0.2-0.6, y1 is 0-1, z1 is 0.3-0.9, x1+y1+z1=1.5, M2 includes at least one of Mn or Fe, M3 includes at least one of Zr, Ti or Y, and M4 includes at least one of Al, Mg, Ca or Bi.

[0267] Lanthanide alloys have stable crystal structures and do not undergo other side reactions when reacting with hydrogen. Furthermore, the differences in atomic radius and electronegativity of different elements in the aforementioned hydrogen storage metals affect the unit cell volume of the hydrogen storage metal and the interaction force between hydrogen and metal atoms. Based on the differences in atomic radius and electronegativity of different elements, and through the combined action with transition metal atoms, the embodiments of this application can increase the hydrogen absorption capacity of the hydrogen storage metal, reduce the initial hydrogen absorption pressure, and improve the hydrogen release kinetics performance.

[0268] As an example, doping with transition metal M2 can reduce the hysteresis of hydrogen storage metals, while M3 and M4 can reduce the hydrogen absorption pressure of hydrogen storage metals, making it easier for them to absorb hydrogen. For instance, the doping element Ti has a particularly significant effect on improving the activation performance of hydrogen storage metals because Ti reacts with hydrogen before other phases during activation to form the TiH2 phase, causing cracks in the hydrogen storage metal and making it easier for hydrogen to enter the interior of the metal, effectively reducing the activation energy. Through the combined effect of the above elements, the hydrogen storage capacity of the hydrogen storage metal can be increased, the initial hydrogen absorption pressure can be reduced, and the hydrogen release kinetics can be improved, making it easier for the metal to absorb hydrogen and less likely to release it. This reduces the hydrogen content in the pouch cell 100, lowers the internal pressure of the pouch cell 100, and extends the lifespan of the pouch cell 100.

[0269] In the above technical solution, by including LaNi as a hydrogen storage metal... 3.5 M2 x1 M3 y1 M4 z1 This can give hydrogen storage metals better hydrogen absorption capacity and effect.

[0270] In some embodiments, hydrogen storage metals include La 0.5 Ni 4.5 Y 0.5 LaNi 3.5 Mn 0.2 YBi 0.3 LaNi 3.5 Mn 0.6 Y 0.4 Bi 0.5 LaNi 3.5 Mn 0.2 Y 0.4 Bi 0.9 LaTi 3.5 Fe 0.4 Zr 0.5 Bi 0.6 LaTi 3.5 Fe 0.4 Zr 0.5 Mg 0.6 LaNi 4.26 Al 0.08 Mg 0.16 Or La 0.43 Y 0.57 Ni 4.5 Al 0.08 Mn 0.3 At least one of them.

[0271] Among the aforementioned hydrogen storage metals, at least one of Y or Fe elements is used, which can reduce the hydrogen absorption plateau pressure of the hydrogen storage metal. The molar ratio of La-site elements to other elements is less than 1:5. The high content of La-site elements results in a large amount of hydrogen absorption and a lower hydrogen absorption plateau pressure of the hydrogen storage metal.

[0272] In the above technical solution, by including the aforementioned metal types in the hydrogen storage metal, which has excellent hydrogen storage capacity, low hydrogen absorption plateau pressure and high hydrogen release plateau pressure, the hydrogen storage metal can effectively absorb the hydrogen generated during the alkali metal battery cycle, thus enabling the hydrogen storage metal to have better hydrogen absorption capacity and effect, reducing the internal pressure of the pouch battery cell 100 and extending the life of the pouch battery cell 100.

[0273] As an example, the preparation method of the above-mentioned hydrogen storage metal can be as follows: the metal elements corresponding to each element of the hydrogen storage metal are mixed in the molar ratio shown in the chemical formula, heated and melted under air-isolated conditions, and then cooled to obtain the hydrogen storage metal.

[0274] Secondly, referring to FIG10, this application provides a battery device 200, including: a pouch battery cell 100 as described in the first aspect embodiment above.

[0275] The battery device 200 may include a housing 60 and a plurality of pouch battery cells 100, which are housed within the housing 60.

[0276] In the above technical solution, by setting the soft-pack battery cell 100, the internal pressure inside the soft-pack battery cell 100 can be reduced, the risk of thermal runaway of the soft-pack battery cell 100 can be reduced, and the service life of the battery device 200 can be extended.

[0277] Thirdly, referring to FIG11, this application provides an electrical device 1000, including: the battery device 200 of the second aspect embodiment described above.

[0278] The electrical device 1000 is a vehicle, and the battery device 200 can be installed at the bottom of the vehicle body 300.

[0279] In the above technical solution, by setting the battery device 200, the battery device 200 has high reliability and long service life, which is conducive to improving the overall performance of the power-consuming device 1000.

[0280] The pouch cell 100 according to several embodiments of the present application is described below with reference to Figures 6-9.

[0281] Referring to FIG6, in some embodiments of this application, the pouch cell 100 includes a housing 10, an electrode assembly 20, a gas storage structure 30, a first insulating layer 40, and a second insulating layer 50. The electrode assembly 20, the gas storage structure 30, the first insulating layer 40, and the second insulating layer 50 are all disposed within the housing 10. The electrode assembly 20 includes an electrode body 21 and a tab 22. The tab 22 includes an assembly area 222 and a connection area 221. The gas storage structure 30 is formed as a coating. A receiving gap 12 is defined between the tab 22 and the first shell wall 11 of the housing 10. The gas storage structure 30 is disposed in the assembly area 222 and located within the receiving gap 12.

[0282] The first insulating layer 40 and the second insulating layer 50 are integral components and both are double-sided adhesive layers. The first insulating layer 40 is bonded to the assembly area 222. The second insulating layer 50 includes the aforementioned first insulating portion 51 and second insulating portion 52. The gas storage structure 30 is disposed on the first insulating layer 40, which is located between the assembly area 222 and the gas storage structure 30. The first insulating portion 51 is bonded to one side of the electrode body 21 adjacent to the assembly area 222 and is located between the electrode body 21 and the gas storage structure 30 to insulate and separate the electrode body 21 from the gas storage structure 30. The second insulating portion 52 covers the main surface 211 of the electrode body 21.

[0283] Referring to FIG7, in some other embodiments of this application, the pouch cell 100 includes a housing 10, an electrode assembly 20, a gas storage structure 30, a first insulating layer 40, and a second insulating layer 50. The electrode assembly 20, the gas storage structure 30, the first insulating layer 40, and the second insulating layer 50 are all disposed within the housing 10. The electrode assembly 20 includes an electrode body 21 and a tab 22. The tab 22 includes an assembly area 222 and a connection area 221. The gas storage structure 30 is formed as a separately manufactured sheet structure. A receiving gap 12 is defined between the tab 22 and the first shell wall 11 of the housing 10. The gas storage structure 30 is disposed in the assembly area 222 and located within the receiving gap 12.

[0284] The first insulating layer 40 and the second insulating layer 50 are integral components and both are double-sided adhesive layers. The first insulating layer 40 is bonded to the assembly area 222. The second insulating layer 50 includes the aforementioned first insulating portion 51 and second insulating portion 52. The gas storage structure 30 is disposed on the first insulating layer 40, which is located between the assembly area 222 and the gas storage structure 30. The first insulating portion 51 is bonded to one side of the electrode body 21 adjacent to the assembly area 222 and is located between the electrode body 21 and the gas storage structure 30 to insulate and separate the electrode body 21 from the gas storage structure 30. The second insulating portion 52 covers the main surface 211 of the electrode body 21.

[0285] Referring to Figures 8-9, in some other embodiments of this application, the pouch cell 100 includes a casing 10, an electrode assembly 20, a gas storage structure 30, and a first insulating layer 40. The electrode assembly 20, the gas storage structure 30, and the first insulating layer 40 are all disposed within the casing 10. The electrode assembly 20 includes an electrode body 21 and tabs 22. The gas storage structure 30 is formed as a coating. A receiving gap 12 is defined between the electrode body 21 and the first shell wall 11 of the casing 10. The gas storage structure 30 is disposed on the main surface 211 of the electrode body 21 and located within the receiving gap 12. The first insulating layer 40 is a double-sided adhesive layer, bonded to the gas storage structure 30, and located between the gas storage structure 30 and the first shell wall 11.

[0286] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0287] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A pouch cell, wherein, include: shell; An electrode assembly is housed within the housing, and a housing gap is defined between the electrode assembly and the housing in the thickness direction of the pouch cell; A gas storage structure is housed within the outer shell and located within the housing gap, wherein at least a portion of the gas storage structure is a hydrogen storage metal.

2. The soft-pack battery cell according to claim 1, wherein, The gas storage structure is formed in a sheet-like shape, and the thickness direction of the gas storage structure is consistent with the thickness direction of the soft-pack battery cell.

3. The soft-pack battery cell according to claim 1, wherein, At least a portion of the gas storage structure is formed as a coating.

4. The soft-pack battery cell according to claim 1, wherein, The gas storage structure includes a shell and a gas storage material filled in the shell. At least a portion of the gas storage material is a hydrogen storage metal. The gas storage material is in granular or powder form. The shell has permeable pores, and the pore size is smaller than the particle size of the gas storage material.

5. The pouch cell according to any one of claims 1-4, wherein, In the thickness direction of the pouch cell, the wall of the outer casing facing the electrode assembly is a first shell wall, the surface of the electrode assembly facing the outer casing is a first surface, and the gas storage structure is fixed to the first shell wall and / or the first surface.

6. The soft-pack battery cell according to claim 5, wherein, The gas storage structure is bonded and fixed to the first shell wall and / or the first surface.

7. The soft-pack battery cell according to claim 5, wherein, At least a portion of the gas storage structure is formed as a coating applied to the first shell wall and / or the first surface.

8. The soft-pack battery cell according to claim 5, wherein, It includes a first insulating layer, at least a portion of which is located between the gas storage structure and the first shell wall and / or at least a portion of which is located between the gas storage structure and the first surface.

9. The soft-pack battery cell according to claim 8, wherein, The projection of the gas storage structure along the thickness direction of the pouch cell is located within the projection of the first insulating layer along the thickness direction of the pouch cell.

10. The soft-pack battery cell according to claim 8, wherein, The first insulating layer is a double-sided adhesive layer, and the gas storage structure is bonded and fixed to the first shell wall and / or the first surface through the first insulating layer.

11. The soft-pack battery cell according to claim 8, wherein, The gas storage structure is fixed to the first insulating layer.

12. The pouch cell according to any one of claims 1-11, wherein, The electrode assembly includes an electrode body and tabs, the tabs being connected to one side or opposite sides of the electrode body, and defining at least a portion of the receiving gap between the tabs and the outer casing in the thickness direction of the pouch cell.

13. The soft-pack battery cell according to claim 12, wherein, The electrode tab is equipped with the gas storage structure.

14. The soft-pack battery cell according to claim 13, wherein, The pouch battery cell also includes a lead-out member, at least a portion of which is located outside the housing. The tab includes a connection area and an assembly area. The lead-out member is connected to the connection area. In the thickness direction of the pouch battery cell, the surface of the electrode assembly facing the housing is a first surface. The first surface includes the assembly area, which faces the receiving gap. The assembly area is provided with the gas storage structure.

15. The pouch cell according to claim 14, wherein, The ratio of the area of ​​the gas storage structure covering the assembly area to the area of ​​the assembly area is greater than 0.

6.

16. The pouch cell according to claim 14, wherein, The gas storage structure located in the assembly area is situated within the assembly area.

17. The pouch cell according to claim 14, wherein, In the thickness direction of the soft-pack battery cell, the surface of the electrode body facing the outer casing is the main surface, the first surface includes the main surface, and the gas storage structure disposed in the assembly area is located between the plane where the assembly area and the main surface are located.

18. The pouch cell according to claim 14, wherein, The gas storage structure located in the assembly area is spaced apart from the electrode body.

19. The pouch cell according to claim 18, wherein, It includes a second insulating layer, at least a portion of which is located between the gas storage structure disposed in the assembly area and the electrode body.

20. The pouch cell according to claim 19, wherein, The second insulating layer includes a first insulating portion and a second insulating portion connected together. The first insulating portion is located between the gas storage structure and the electrode body. The surface of the electrode body facing the outer shell is the main surface. The first surface includes the main surface, and the second insulating portion is located on the main surface.

21. The soft-pack battery cell according to claim 14, wherein, Includes a first insulating layer, the wall of the housing facing the electrode assembly is a first housing wall, and at least a portion of the first insulating layer is located between the gas storage structure and the assembly area or at least a portion of the first insulating layer is located between the gas storage structure and the first housing wall.

22. The soft-pack battery cell according to claim 21, wherein, In the thickness direction of the soft-pack battery cell, the projection of the first insulating layer opposite to the assembly area in the assembly area is located within the assembly area, and the projection of the gas storage structure opposite to the assembly area in the assembly area is located within the projection of the corresponding first insulating layer in the assembly area.

23. The soft-pack battery cell according to claim 21, wherein, At least a portion of the first insulating layer is located between the gas storage structure and the assembly area. The soft-pack battery cell also includes a second insulating layer, at least a portion of which is located between the gas storage structure and the electrode body. The second insulating layer is connected to the first insulating layer and integrally formed.

24. The pouch cell according to any one of claims 1-11, wherein, The electrode assembly includes an electrode body and tabs, the tabs being connected to one side or opposite sides of the electrode body. In the thickness direction of the pouch cell, at least a portion of the receiving gap is defined between the electrode body and the outer casing.

25. The pouch cell according to claim 24, wherein, The surface of the electrode body facing the accommodating gap is the main surface, and the main surface is provided with the gas storage structure.

26. The pouch cell according to claim 25, wherein, The ratio of the area of ​​the gas storage structure covering the main surface to the area of ​​the main surface is greater than 0.

6.

27. The pouch cell according to claim 25, wherein, The gas storage structure located on the main surface is situated within the main surface.

28. The pouch cell according to claim 24, wherein, Includes a first insulating layer. In the thickness direction of the pouch cell, the wall of the outer casing facing the electrode assembly is the first shell wall, the surface of the electrode body facing the receiving gap is the main surface, and at least a portion of the first insulating layer is located between the gas storage structure and the first shell wall or at least a portion of the first insulating layer is located between the gas storage structure and the main surface.

29. The pouch cell according to claim 28, wherein, In the thickness direction of the pouch cell, the projection of the first insulating layer opposite to the main surface on the main surface is located within the main surface, and the projection of the gas storage structure opposite to the main surface on the main surface is located within the projection of the corresponding first insulating layer on the main surface.

30. The pouch cell according to any one of claims 1-29, wherein, The pouch cell is configured as an alkali metal battery.

31. The soft-pack battery cell according to claim 30, wherein, The electrode assembly includes a negative electrode sheet, the negative electrode sheet includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

32. The soft-pack battery cell according to claim 31, wherein, The active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum.

33. The soft-pack battery cell according to claim 30, wherein, The electrolyte of the pouch cell includes a solvent, which is configured as at least one of an ether solvent or an ester solvent.

34. The soft-pack battery cell according to claim 33, wherein, The solvent includes ether solvents, which include at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxopentane.

35. The pouch cell according to any one of claims 1-34, wherein, The hydrogen storage metal includes zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or La. x Ni y M z At least one of them, Wherein, M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca or Bi, 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3.

36. The pouch cell according to claim 35, wherein, M includes at least one of Al, Mn, Mg, Fe, Y or Bi, and 0.3≤x≤1, 1≤y≤5, 0≤z≤1; Or the titanium alloy may include at least one of TiNi, Ti2Ni, TiFe or TiMn2; Or the magnesium alloy may include at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr or Mg2Te; Or the zirconium alloy may include at least one of ZrV2, ZrCr2, or ZrMn2; Or the vanadium alloy may include V3TiNi 0.56 M1m, m = 0.046-0.24, M1 includes at least one of Al, Si, Fe, Cu or Zr.

37. The pouch cell according to claim 35, wherein, The hydrogen storage metal includes LaNi. 3.5 M2 x1 M3 y1 M4 z1 Where x1 is 0.2-0.6, y1 is 0-1, z1 is 0.3-0.9, x1+y1+z1=1.5, M2 includes at least one of Mn or Fe, M3 includes at least one of Zr, Ti or Y, and M4 includes at least one of Al, Mg, Ca or Bi.

38. The pouch cell according to claim 35, wherein, The hydrogen storage metal includes La. 0.5 Ni 4.5 Y 0.5 LaNi 3.5 Mn 0.2 YBi 0.3 LaNi 3.5 Mn 0.6 Y 0.4 Bi 0.5 LaNi 3.5 Mn 0.2 Y 0.4 Bi 0.9 LaTi 3.5 Fe 0.4 Zr 0.5 Bi 0.6 LaTi 3.5 Fe 0.4 Zr 0.5 Mg 0.6 LaNi 4.26 Al 0.08 Mg 0.16 Or La 0.43 Y 0.57 Ni 4.5 Al 0.08 Mn 0.3 At least one of them.

39. A battery device, wherein, include: The soft-pack battery cell according to any one of claims 1-38.

40. An electrical appliance, wherein, include: The battery device according to claim 39.

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