Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment. The battery monomer comprises an electrode assembly, the electrode assembly comprises a pole piece and a separator, the separator comprises a porous substrate and an elastic layer, and the porous substrate is provided with an ion transmission area arranged on one side of the pole piece in the first direction and an elastic area arranged on at least one side of the ion transmission area in the second direction. The elastic layer is arranged in the elastic area of the porous substrate. Wherein the first direction is parallel to the thickness direction of the pole piece and intersects with the second direction. Therefore, the elastic layer can be used for absorbing impact energy generated when the pole piece is in contact with other parts, so that the possibility that the pole piece is damaged when being in contact with other parts is reduced, the pole piece can be well protected by using the elastic layer, and the reliability of the battery monomer can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] Batteries are widely used in electronic devices such as mobile phones and laptops due to their high energy density and environmental friendliness. In recent years, to address environmental issues, gasoline prices, and energy storage challenges, battery applications have rapidly expanded to hybrid vehicles, ships, and energy storage systems.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells is an urgent problem to be solved. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, battery device, and electrical equipment that can improve the reliability of the battery cell in order to address the above technical problems.

[0005] According to a first aspect of this application, a battery cell is provided. The battery cell includes an electrode assembly, which includes an electrode sheet and a separator. The separator includes a porous substrate and an elastic layer. The porous substrate has an ion transport region disposed along a first direction on one side of the electrode sheet, and an elastic region disposed along at least one side of the ion transport region along a second direction. The elastic layer is disposed in the elastic region of the porous substrate. The first direction is parallel to the thickness direction of the electrode sheet and intersects with the second direction.

[0006] In the technical solution of this application, on the one hand, since the ion transport region is located on one side of the electrode along the thickness direction of the electrode, the ion transport region of the porous substrate is provided corresponding to the electrode. The ion transport region of the porous substrate allows ions to pass through and is separated from the elastic region, which is beneficial to improving the ion transport capability of the separator. On the other hand, the elastic region is located on at least one side of the ion transport region along the second direction, and the elastic layer is located in the elastic region of the porous substrate. This allows the separator to take into account both elastic function and ion transport function. The elastic layer is used to absorb the impact energy when the electrode comes into contact with other components, thereby reducing the possibility of damage to the electrode when it comes into contact with other components. The elastic layer can effectively protect the electrode, thereby improving the reliability of the battery cell.

[0007] In one embodiment, the thickness of the elastic layer is 0.01 mm to 1 mm.

[0008] Setting the thickness of the elastic layer within a suitable range is beneficial for improving the elasticity of the insulating component while also controlling the thickness of the electrode assembly, making it easier to assemble the electrode assembly into the housing.

[0009] In one embodiment, the thickness of the elastic layer is 0.1 mm to 0.3 mm.

[0010] Setting the thickness of the elastic layer within a suitable range is beneficial in two ways: firstly, it helps control the thickness of the electrode assembly, making it easier to assemble the electrode assembly into the casing; secondly, it can significantly improve the elasticity of the separator, thereby enhancing the reliability of the battery cell.

[0011] In one embodiment, the ion transport region is provided with elastic regions on opposite sides along the second direction.

[0012] In this way, the elastic layer on both sides of the elastic region can protect the electrode on opposite sides along the second direction, thereby better reducing the possibility of damage to the electrode and improving the reliability of the battery cell.

[0013] In one embodiment, the electrode assembly includes a plurality of electrodes, and the porous substrate includes a plurality of substrate bodies alternately disposed with the plurality of electrodes along a first direction, each substrate body having an ion transport region and at least one elastic region.

[0014] The elastic layer on each substrate can be used to protect adjacent electrodes, thereby reducing the possibility of damage to adjacent electrodes and improving the reliability of the battery cell.

[0015] In one embodiment, the elastic layer of the substrate body has a dimension of 1 mm to 20 mm along the second direction.

[0016] By setting the dimensions of the elastic layer of the substrate body along the second direction within a suitable range, and combining the ion transport region with the electrode, and with the elastic region located on one side of the ion transport region along the second direction, the elastic layer can protrude a certain distance from the electrode along the second direction, thereby better utilizing the elastic layer to protect the electrode, reducing the possibility of damage to adjacent electrodes, and thus improving the reliability of the battery cell.

[0017] In one embodiment, the elastic layer of the substrate body has a dimension of 2mm to 6mm along the second direction.

[0018] Setting the size of the elastic layer of the substrate body along the second direction within a suitable range is beneficial for better protection of the electrode sheet by utilizing the elastic layer, thereby reducing the possibility of damage to adjacent electrode sheets. At the same time, it can also effectively control the size of the electrode assembly along the second direction, reducing the possibility of the electrode assembly being too large.

[0019] In one embodiment, in at least two adjacent base bodies, two adjacent elastic regions are connected end to end.

[0020] This can improve the overall strength of the two substrates, which in turn helps to better utilize the two adjacent elastic regions to protect the adjacent electrodes, thereby improving the reliability of the battery cell.

[0021] In one embodiment, at least two adjacent base bodies are integrally formed structures.

[0022] This improves the strength of the separator, thereby increasing its reliability. It also allows for better utilization of the separator's elastic layer to protect the electrode, which in turn improves the reliability of the battery cell.

[0023] In one embodiment, the porous substrate further includes a plurality of connecting portions, which connect two adjacent substrate bodies. The two adjacent connecting portions are located on opposite sides of the same substrate body along a second direction, and an elastic layer is disposed in the elastic region and on the connecting portions.

[0024] Each substrate body of the porous substrate is located between two adjacent electrodes, which facilitates the separation of the two adjacent electrodes and allows ions to pass through the ion transport region of the substrate body and be transported between the two adjacent electrodes. In addition, the elastic layer is provided in the elastic region and on the connecting part, which is equivalent to placing a part of the elastic layer at the corner of the porous substrate. This helps to improve the impact resistance at the corner of the porous substrate. After the electrode assembly is installed in the shell, multiple connecting parts on the same side along the second direction can be squeezed together to form an effective elastic protection zone. It also helps to better protect the electrodes by utilizing the elastic layer on the elastic region and the connecting part, reducing the probability of electrode damage, and thus improving the reliability of the battery cell.

[0025] In one embodiment, the electrode assembly includes a plurality of electrodes, with two adjacent electrodes being a first electrode and a second electrode of opposite polarity, and along a first direction, the ion transport region of the porous substrate of the separator is located between the first electrode and the second electrode.

[0026] In this way, the first electrode and the adjacent second electrode can be separated by a separator, and ions can pass through the ion transport region and be transported between the first electrode and the adjacent second electrode. In addition, the first electrode and the adjacent second electrode can be protected by an elastic layer, thereby improving the reliability of the battery cell.

[0027] In one embodiment, the orthographic projection of the electrode onto the separator lies within the ion transport region.

[0028] The ion transport region can cover the area corresponding to the electrode, which is beneficial to improving the ion transport capability of the separator. It can be understood that the electrode has an elastic region on at least one side along the second direction, so that the elastic layer is part of the separator that protrudes from the electrode along the second direction. In this way, the elastic layer can be used to better protect the electrode, thereby improving the reliability of the battery cell.

[0029] And / or, the orthographic projection of the electrode in the target plane and the orthographic projection of the elastic region in the target plane are offset from each other; wherein, the target plane is perpendicular to the first direction. The thickness of the elastic layer is not limited by the ion transport requirements of the insulator, which is beneficial to better balance the ion transport function and elastic function of the insulator.

[0030] In one embodiment, the elastic layer is made of an elastic polymer.

[0031] By utilizing elastic polymers, the elasticity of the separator can be improved, which can better protect the electrode and reduce the impact of the electrolyte in the battery cell on the elastic layer, thereby improving the corrosion resistance and reliability of the separator.

[0032] In one embodiment, the spacer further includes an adhesive disposed in the ion transport region of the porous substrate.

[0033] This makes it easy to use adhesives to bond the electrodes and spacers together, so that multiple electrodes and spacers can be connected to form an electrode assembly.

[0034] And / or, the spacer also includes ceramic particles disposed in the ion transport region of the porous substrate. Disposing of ceramic particles in the ion transport region of the porous substrate can improve the spacer's puncture resistance and heat resistance.

[0035] In one embodiment, along a third direction, the porous substrate protrudes from at least one side of the electrode, wherein the first direction, the second direction, and the third direction intersect each other pairwise. The porous substrate can be used to better separate adjacent electrodes.

[0036] And / or, along a third direction, the elastic layer protrudes from at least one side of the electrode along the third direction, wherein the first direction, the second direction, and the third direction intersect each other. The elastic layer can be used to better protect the electrode.

[0037] According to a second aspect of this application, a battery device is provided, comprising a battery cell of any of the above embodiments.

[0038] According to a third aspect of this application, an electrical device is provided, including the battery device described above.

[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0041] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0042] Figure 2 A schematic diagram of the structure of a battery cell according to an embodiment of this application is shown.

[0043] Figure 3 A schematic diagram of the structure of an electrode assembly according to an embodiment of this application is shown.

[0044] Figure 4 A schematic diagram of the structure of an isolation member according to an embodiment of this application is shown.

[0045] Reference numerals: 1. Vehicle; 10. Battery device; 100. Electrode assembly; 110. Electrode; 111. First electrode; 112. Second electrode; 120. Separator; 121. Porous substrate; 1211. Ion transport region; 1212. Elastic region; 122. Elastic layer; 121a. Substrate body; 121b. Connector; 121c. First end; 121d. Second end; 200. Housing; 300. Cover; 400. Terminal post; 500. Pressure relief mechanism; 20. Motor; 30. Controller. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0052] In related technologies, the separator of an electrode assembly typically includes a porous membrane and an elastic layer disposed on the porous membrane. If the elastic function of the separator is to be improved, the ion transport capacity of the separator will be reduced, which in turn makes it difficult for the separator to balance ion transport capacity and elastic function.

[0053] To address the above technical issues, this application designs a battery cell, a battery device, and an electrical appliance, enabling the separator of the electrode assembly of the battery cell to balance ion transport capability and elasticity.

[0054] The battery cells and / or battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. These electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. The power system of this electrical equipment can be composed using the battery cells and / or battery devices disclosed in this application, which facilitates providing power to the equipment and extends its service life.

[0055] Figure 1 This illustration shows a structural diagram of a vehicle 1 according to an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1.

[0056] The interior of vehicle 1 may also be equipped with a motor 20 and a controller 30. The controller 30 is used to control the power supply of the battery device 10 to the motor 20, for example, for the power needs of vehicle 1 during starting, navigation and driving.

[0057] The battery device 10 may include a single battery cell, or it may include multiple battery cells, which are electrically connected in series, parallel, or mixed connection (mixed connection refers to a combination of series and parallel connection).

[0058] Figure 2 A schematic diagram of the structure of a battery cell according to an embodiment of this application is shown. Figure 3 A schematic diagram of the structure of an electrode assembly according to an embodiment of this application is shown. Figure 4 A schematic diagram of the structure of an isolation member according to an embodiment of this application is shown.

[0059] Please refer to the following: Figures 2-4 One embodiment of this application provides a battery cell, which includes an electrode assembly 100. The electrode assembly 100 includes an electrode 110 and a separator 120. The separator 120 includes a porous substrate 121 and an elastic layer 122. The porous substrate 121 has an ion transport region 1211 disposed along a first direction F1 on one side of the electrode 110, and an elastic region 1212 disposed along at least one side of the ion transport region 1211 along a second direction F2. The elastic layer 122 is disposed in the elastic region 1212 of the porous substrate 121. The first direction F1 is parallel to the thickness direction of the electrode 110 and intersects with the second direction F2.

[0060] Electrode assembly 100 refers to an assembly including electrode 110 and separator 120, and the electrode assembly 100 is disposed within the housing 200 of the battery cell.

[0061] Electrode 110 can be a positive electrode or a negative electrode.

[0062] The separator 120 refers to the component in the electrode assembly 100 used to separate two adjacent electrodes 110. The separator 120 is used to separate the positive electrode and the negative electrode.

[0063] The porous substrate 121 refers to a component on the separator 120 that has multiple ion transport pores and is used to support the elastic layer 122. The porous substrate 121 can be made of polypropylene or polyethylene.

[0064] The ion transport region 1211 refers to the area on the porous substrate 121 that is used for the passage of ions, so that ions in the electrolyte in the battery cell can pass through the ion transport region 1211 and be transported between two adjacent electrodes 110, so as to realize the charging and discharging of the battery cell.

[0065] The elastic region 1212 refers to the area on the porous substrate 121 used to set the elastic layer 122.

[0066] Elastic layer 122 refers to a component with elastic function.

[0067] The first direction F1 can be perpendicular to the second direction F2. For example, the second direction F2 is parallel to the length direction of the electrode 110.

[0068] On the one hand, since the ion transport region 1211 is located on one side of the electrode 110 along the thickness direction of the electrode 110, the ion transport region 1211 of the porous substrate 121 is provided corresponding to the electrode 110. Combined with the fact that the ion transport region 1211 of the porous substrate 121 allows ions to pass through and is partitioned with the elastic region 1212, it is beneficial to improve the ion transport capability of the separator 120. On the other hand, the elastic region 1212 is located on at least one side of the ion transport region 1211 along the second direction F2, and the elastic layer 122 is located in the elastic region 1212 of the porous substrate 121. This allows the separator 120 to take into account both elasticity and ion transport functions. The elastic layer 122 is used to absorb the impact energy when the electrode 110 comes into contact with other components, thereby reducing the possibility of damage to the electrode 110. The elastic layer 122 can effectively protect the electrode 110, thereby improving the reliability of the battery cell. In addition, the thickness of the elastic layer 122 is not limited by the ion transport requirements of the separator 120, which is beneficial to improving the elastic function of the separator 120.

[0069] In addition, the elastic layer 122 in this application can replace the side support plate design. Compared with the design that reduces the damage to the electrode 110 by using a side support plate, this application abandons the side support plate design, which simplifies the assembly process of the battery cell and thus improves the manufacturing efficiency of the battery cell.

[0070] In some embodiments, the thickness of the elastic layer 122 is 0.01 mm to 1 mm.

[0071] For example, the thickness of the elastic layer 122 may be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm or 1 mm.

[0072] Setting the thickness of the elastic layer 122 within a suitable range is beneficial to improving the elastic function of the insulating member 120 while also controlling the thickness of the electrode assembly 100, making it easier for the electrode assembly 100 to be assembled into the shell.

[0073] In some embodiments, the thickness of the elastic layer 122 is 0.1 mm to 0.3 mm.

[0074] For example, the thickness of the elastic layer 122 may be 0.1 mm, 0.2 mm or 0.3 mm.

[0075] Setting the thickness of the elastic layer 122 within a suitable range is beneficial in two ways: firstly, it helps control the thickness of the electrode assembly 100, making it easier to assemble the electrode assembly 100 into the casing; secondly, it can significantly improve the elasticity of the separator 120, thereby improving the reliability of the battery cell.

[0076] In some embodiments, the thickness of the portion of the isolator 120 located in the ion transport region 1211 may be equal to the thickness of the portion of the isolator 120 located in the elastic region 1212; alternatively, the thickness of the portion of the isolator 120 located in the ion transport region 1211 may not be equal to the thickness of the portion of the isolator 120 located in the elastic region 1212. No specific limitations are imposed here.

[0077] In some embodiments, the ion transport region 1211 is provided with elastic regions 1212 on opposite sides along the second direction F2.

[0078] In this way, the elastic layer 122 on the elastic regions 1212 on both sides can protect the electrode 110 on opposite sides along the second direction F2, thereby better reducing the possibility of damage to the electrode 110 and thus improving the reliability of the battery cell.

[0079] In some embodiments, the electrode assembly 100 includes a plurality of electrode sheets 110, and the porous substrate 121 includes a plurality of substrate bodies 121a alternately disposed with the plurality of electrode sheets 110 along a first direction F1, each substrate body 121a having an ion transport region 1211 and at least one elastic region 1212.

[0080] The substrate body 121a refers to the portion of the porous substrate 121 that has an ion transport region 1211 and at least one elastic region 1212.

[0081] Each substrate body 121a may have an ion transport region 1211 and two elastic regions 1212, the two elastic regions 1212 being located on opposite sides of adjacent ion transport regions 1211 along the second direction F2.

[0082] The elastic layer 122 on each substrate 121a can be used to protect the adjacent electrode 110, thereby reducing the possibility of damage to the adjacent electrode 110 and improving the reliability of the battery cell.

[0083] In some embodiments, the elastic layer 122 of the substrate body 121a has a size of 1 mm to 20 mm along the second direction F2.

[0084] For example, the elastic layer 122 of the substrate body 121a has a dimension of W along the second direction F2, where W is 1 mm, 5 mm, 10 mm, 15 mm or 20 mm.

[0085] The elastic layer 122 of the substrate body 121a is set within a suitable range along the second direction F2. Combined with the ion transport region 1211 corresponding to the electrode 110, and the elastic region 1212 located on one side of the ion transport region 1211 along the second direction F2, the elastic layer 122 can protrude from the electrode 110 by a certain distance along the second direction F2. This allows the elastic layer 122 to better protect the electrode 110, thereby reducing the possibility of damage to adjacent electrodes 110 and improving the reliability of the battery cell.

[0086] In some embodiments, the elastic layer 122 of the substrate body 121a has a size of 2 mm to 6 mm along the second direction F2.

[0087] For example, the elastic layer 122 of the substrate 121a has a dimension of W along the second direction F2, where W is 2mm, 3mm, 4mm, 5mm or 6mm.

[0088] Setting the size of the elastic layer 122 of the substrate 121a along the second direction F2 within a suitable range is beneficial to better utilize the elastic layer 122 to protect the electrode 110, thereby reducing the possibility of damage to adjacent electrode 110. At the same time, it can also effectively control the size of the electrode assembly 100 along the second direction F2, reducing the possibility of the electrode assembly 100 being too large.

[0089] In some embodiments, in at least two adjacent base bodies 121a, two adjacent elastic regions 1212 are connected end to end to each other.

[0090] It can be that in one or more groups of base bodies (the base body group includes two adjacent base bodies 121a), two adjacent elastic regions 1212 are connected end to end to each other.

[0091] Alternatively, in any two adjacent base bodies 121a, the two adjacent elastic regions 1212 are connected end to end.

[0092] Since the two adjacent elastic regions 1212 in at least one adjacent base body 121a are connected end to end, the overall strength of the two base bodies 121a can be improved, which is conducive to better utilizing the two adjacent elastic regions 1212 to protect the adjacent electrode 110, thereby improving the reliability of the battery cell.

[0093] In some embodiments, at least two adjacent base bodies 121a are integrally formed structures.

[0094] It can be that two adjacent base bodies 121a are integrally formed, or multiple adjacent base bodies 121a are integrally formed, or all base bodies 121a are integrally formed; no specific restrictions are made here.

[0095] This improves the strength of the separator 120, thereby increasing its reliability. It also allows for better utilization of the elastic layer 122 of the separator 120 to protect the electrode 110, thus improving the reliability of the battery cell.

[0096] In some embodiments, the porous substrate 121 further includes a plurality of connecting portions 121b, which connect two adjacent substrate bodies 121a, and the two adjacent connecting portions 121b are respectively located on opposite sides of the same substrate body 121a along the second direction F2. An elastic layer 122 is disposed in the elastic region 1212 and on the connecting portions 121b.

[0097] The connecting part 121b refers to the part on the porous substrate 121 used to connect two adjacent substrate bodies 121a.

[0098] It is understood that the porous substrate 121 has a first end 121c and a second end 121d disposed opposite to each other, and the porous substrate 121 extends in a serpentine manner from the first end 121c to the second end 121d.

[0099] Since two adjacent connecting portions 121b are located on opposite sides of the same substrate body 121a along the second direction F2, the porous substrate 121 has a roughly serpentine structure. Each substrate body 121a of the porous substrate 121 is located between two adjacent electrodes 110, which facilitates the separation of the two adjacent electrodes 110 and allows ions to pass through the ion transport region 1211 of the substrate body 121a and be transported between the two adjacent electrodes 110. In addition, an elastic layer 122 is provided in the elastic region 1212 and in the connecting portion 1 On 21b, a portion of the elastic layer 122 is disposed at the corner of the porous substrate 121, which is beneficial to improve the impact resistance at the corner of the porous substrate 121. After the electrode assembly 100 is installed in the shell, multiple connecting portions 121b on the same side along the second direction F2 can be squeezed together to form an effective elastic protection zone. It is also beneficial to use the elastic zone 1212 and the elastic layer 122 on the connecting portion 121b to better protect the electrode 110, reduce the probability of damage to the electrode 110, and thus improve the reliability of the battery cell.

[0100] In some embodiments, the electrode assembly 100 includes a plurality of electrodes 110, with two adjacent electrodes 110 being a first electrode 111 and a second electrode 112 of opposite polarities. Along the first direction F1, the ion transport region 1211 of the porous substrate 121 of the separator 120 is located between the first electrode 111 and the second electrode 112.

[0101] One of the first electrode 111 and the second electrode 112 is a positive electrode, and the other of the first electrode 111 and the second electrode 112 is a positive electrode.

[0102] It is possible that there are multiple isolation members 120, each isolation member 120 being used to separate the corresponding first electrode 111 and the adjacent second electrode 112.

[0103] Alternatively, the isolator 120 may be provided with a plurality of ion transport regions 1211 and a plurality of elastic regions 1212, each ion transport region 1211 being used to separate the corresponding first electrode 111 and the adjacent second electrode 112.

[0104] Thus, the first electrode 111 and the adjacent second electrode 112 can be separated by the separator 120, and ions can pass through the ion transport region 1211 and be transported between the first electrode 111 and the adjacent second electrode 112. In addition, the elastic layer 122 can be used to protect the first electrode 111 and the adjacent second electrode 112, thereby improving the reliability of the battery cell.

[0105] In some embodiments, the orthographic projection of the electrode 110 onto the separator 120 lies within the range of the ion transport region 1211.

[0106] The ion transport region 1211 can cover the area corresponding to the electrode 110, which is beneficial to improving the ion transport capability of the separator 120. It can be understood that the electrode 110 has an elastic region 1212 on at least one side along the second direction F2, so that the elastic layer 122 is part of the separator 120 that protrudes from the electrode 110 along the second direction F2. In this way, the elastic layer 122 can be used to better protect the electrode 110, thereby improving the reliability of the battery cell.

[0107] In some embodiments, the orthographic projection of the electrode 110 in the target plane is offset from the orthographic projection of the elastic region 1212 in the target plane; wherein the target plane is perpendicular to the first direction F1.

[0108] This allows the ion transport function and elastic function of the isolator 120 to not interfere with each other, and the thickness of the elastic layer 122 is not limited by the ion transport requirements of the isolator 120, which is conducive to better balancing the ion transport function and elastic function of the isolator 120.

[0109] In some embodiments, the elastic layer 122 is made of an elastic polymer.

[0110] The elastic layer 122 can be made of methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, methyl vinyl trifluoropropyl silicone rubber, silicone acrylonitrile rubber, or polyurethane elastomer, etc.

[0111] Alternatively, a precursor may be coated onto the elastic region 1212, and then the precursor may be cured under certain conditions to obtain an elastic polymer; alternatively, a partially volatile polymer may be coated onto the elastic region 1212, and the elastic polymer may be obtained after the solvent of the polymer evaporates. No specific limitations are imposed here.

[0112] By utilizing elastic polymers, the elastic function of the separator 120 can be improved, thereby better protecting the electrode 110 and reducing the impact of the electrolyte in the battery cell on the elastic layer 122, which in turn improves the corrosion resistance and reliability of the separator 120.

[0113] In some embodiments, the separator 120 further includes an adhesive disposed in the ion transport region 1211 of the porous substrate 121.

[0114] The adhesive component can be made of polyvinylidene fluoride or other materials that can be used in electrolytes and have adhesive properties.

[0115] This facilitates the bonding of the electrode 110 and the spacer 120 together using adhesives, so that multiple electrodes 110 and spacers 120 can be connected to form an electrode assembly 100.

[0116] In some embodiments, the separator 120 further includes ceramic particles disposed in the ion transport region 1211 of the porous substrate 121.

[0117] The materials of ceramic particles may include alumina and / or silicon oxide, etc.

[0118] By placing ceramic particles in the ion transport region 1211 of the porous substrate 121, the puncture resistance and heat resistance of the separator 120 can be improved.

[0119] In some embodiments, at least two adjacent base bodies 121a are integrally formed structures.

[0120] This improves the strength of the separator 120, thereby enhancing its reliability. It also allows for better protection of the electrode 110, further improving the reliability of the battery cell. Furthermore, by using multiple substrate bodies 121a of the separator 120 to separate adjacent electrode 110, designing a single separator 120 reduces the number of components in the battery cell, thus improving manufacturing convenience.

[0121] In some embodiments, the porous substrate 121 protrudes from at least one side of the electrode 110 along the third direction F3, wherein the first direction F1, the second direction F2 and the third direction F3 intersect each other.

[0122] It is possible that, along the third direction F3, one side of the porous substrate 121 protrudes from the electrode 110; or it is possible that, along the third direction F3, both opposite sides of the porous substrate 121 protrude from the electrode 110; no specific limitation is made here.

[0123] It can be that the first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. For example, the first direction F1 is parallel to the thickness direction of the battery cell, the second direction F2 is parallel to the length direction of the battery cell, and the third direction F3 is parallel to the width direction of the battery cell.

[0124] Since the porous substrate 121 protrudes from the electrode 110 on at least one side along the third direction F3, the porous substrate 121 can be used to better separate two adjacent electrodes 110, that is, the porous substrate 121 can be used to better separate the adjacent first electrode 111 and second electrode 112.

[0125] In some embodiments, along a third direction F3, the elastic layer 122 protrudes from at least one side of the electrode 110 along the third direction F3, wherein the first direction F1, the second direction F2 and the third direction F3 intersect each other.

[0126] It is possible that, along the third direction F3, the elastic layer 122 protrudes from the electrode 110 on one side along the third direction F3; or it is possible that, along the third direction F3, the elastic layer 122 protrudes from the electrode 110 on both opposite sides along the third direction F3; no specific limitation is made here.

[0127] Since the elastic layer 122 protrudes from at least one side of the electrode 110 along the third direction F3, the elastic layer 122 can better protect the electrode 110, that is, the elastic layer 122 can better protect the first electrode 111 and the second electrode 112.

[0128] In some embodiments, the battery cell further includes a housing 200, and the electrode assembly 100 is disposed within the housing 200.

[0129] During the process of the electrode assembly 100 moving and impacting the housing 200, the elastic layer 122 of the separator 120 can absorb the impact energy during the impact process, thereby reducing the probability of damage to the electrode 110 and protecting the electrode 110 well, thus improving the reliability of the battery cell.

[0130] In some embodiments, the housing 200 has a receiving cavity (not shown) for accommodating the electrode assembly 100, and the housing 200 has an opening (not shown) communicating with the receiving cavity.

[0131] It is possible that the opening is located on one side of the housing 200 along the third direction F3.

[0132] Since the opening is connected to the receiving cavity, it is advantageous for the electrode assembly 100 to be assembled into the housing through the opening.

[0133] In some embodiments, the battery cell further includes an electrical separator (not shown) located within the housing 200, and at least a portion of the electrode assembly 100 is located within the electrical separator.

[0134] Electrical isolation between the electrode assembly 100 and the housing 200 can be achieved through an electrical isolator.

[0135] In some embodiments, the opening is located on one side of the housing 200 along the third direction F3, and the battery cell also includes a cover 300, which is connected to the side of the housing 200 where the opening is located and is used to close the opening.

[0136] Thus, after the electrode assembly 100 is installed into the housing, the opening can be closed by the cover 300, which can better protect the electrode assembly 100 and prevent water or dust from the external environment from entering the housing cavity.

[0137] In some embodiments, the electrode 110 includes a tab, and the battery cell further includes a terminal post 400 disposed on the cover 300, with the tab and the terminal post 400 electrically connected. Alternatively, the battery cell may include two terminals 400, one terminal post 400 being electrically connected to the tab of the first electrode 111, and the other terminal post 400 being electrically connected to the tab of the second electrode 112.

[0138] In some embodiments, the battery cell further includes a pressure relief mechanism 500 disposed on the cover 300. The pressure relief mechanism 500 may be an explosion-proof valve, a one-way valve, a pressure relief valve, or other component that can connect the cavity to the external environment when the pressure in the cavity is greater than or equal to a preset value.

[0139] One embodiment of this application provides a battery device 10, including a battery cell from any of the above embodiments.

[0140] One embodiment of this application provides an electrical device including the battery device 10 described above.

[0141] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0142] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized by, The battery cell comprises an electrode assembly, the electrode assembly comprising: a pole piece (110); and a separator (120) comprising: a porous substrate (121) having an ion transmission zone (1211) provided on one side of the pole piece (110) along a first direction, and an elastic zone (1212) provided on at least one side of the ion transmission zone (1211) along a second direction; and an elastic layer (122) provided on the elastic zone (1212) of the porous substrate (121); wherein the first direction is parallel to the thickness direction of the pole piece (110), and intersects with the second direction.

2. The battery cell of claim 1, wherein, The thickness of the elastic layer (122) is 0.01mm-1mm.

3. The battery cell of claim 2, wherein, The thickness of the elastic layer (122) is 0.1mm-0.3mm.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The ion transmission zone (1211) is provided with the elastic zone (1212) on opposite sides along the second direction.

5. The battery cell of any one of claims 1-3, wherein, The electrode assembly comprises a plurality of the pole pieces (110); The porous substrate (121) comprises a plurality of substrate bodies (121a) arranged alternately with the plurality of pole pieces (110) along the first direction; Each of the substrate bodies (121a) has the ion transmission zone (1211) and at least one elastic zone (1212).

6. The battery cell of claim 5, wherein, The dimension of the elastic layer (122) of the substrate body (121a) along the second direction is 1mm-20mm.

7. The battery cell of claim 6, wherein, The dimension of the elastic layer (122) of the substrate body (121a) along the second direction is 2mm-6mm.

8. The battery cell of claim 5, wherein, In at least two adjacent substrate bodies (121a), the two adjacent elastic zones (1212) are connected end to end.

9. The battery cell of claim 5, wherein, At least two adjacent substrate bodies (121a) are integrally formed.

10. The battery cell of claim 5, wherein, The porous substrate (121) further comprises a plurality of connecting portions (121b); The connecting portions (121b) are connected between two adjacent substrate bodies (121a); Two adjacent connecting portions (121b) are located on opposite sides of the same substrate body (121a) along the second direction; The elastic layer (122) is provided on the elastic zone (1212) and on the connecting portion (121b).

11. The battery cell of any one of claims 1-3, wherein, The electrode assembly comprises a plurality of the pole pieces (110), and two adjacent pole pieces (110) are a first pole piece (111) and a second pole piece (112) with opposite polarities; Along the first direction, the ion transmission zone (1211) of the porous substrate (121) of the separator (120) is located between the first pole piece (111) and the second pole piece (112).

12. The battery cell of any one of claims 1-3, wherein, The orthogonal projection of the pole piece (110) on the separator (120) is located within the range of the ion transmission zone (1211); and / or The orthogonal projection of the pole piece (110) in a target plane is staggered with the orthogonal projection of the elastic zone (1212) in the target plane; wherein the target plane is perpendicular to the first direction.

13. The battery cell of any one of claims 1-3, wherein, The material of the elastic layer (122) comprises a polymer with elasticity.

14. The battery cell of any one of claims 1-3, wherein, The separator (120) further comprises an adhesive; the adhesive is provided on the ion transmission region (1211) of the porous substrate (121); and / or The separator (120) further comprises ceramic particles; the ceramic particles are provided on the ion transmission region (1211) of the porous substrate (121).

15. The battery cell of any one of claims 1-3, wherein, In a third direction, the porous substrate (121) protrudes from the pole piece (110) on at least one side of the third direction; and / or In a third direction, the elastic layer (122) protrudes from the pole piece (110) on at least one side of the third direction; The first direction, the second direction and the third direction are perpendicular to each other.

16. A battery device characterized by comprising: A battery cell comprising any one of the separators of claims 1-15.

17. An electrical device, characterized by A battery device comprising the battery cell of claim 16.

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