Battery cell and electric equipment

Abstract

The invention provides a battery cell and electric equipment, the battery cell comprises a shell, an electrode assembly and a reference electrode, the shell is provided with a first output terminal, a first acquisition terminal and a reference acquisition terminal; the electrode assembly and the reference electrode are accommodated in the shell, the electrode assembly comprises a first pole piece, a first tab and a first auxiliary tab, the first tab and the first auxiliary tab are both connected to the first pole piece, the first tab is electrically connected with the first output terminal, the first auxiliary tab is electrically connected with the first acquisition terminal, the reference electrode is electrically connected with the reference acquisition terminal, and the reference acquisition terminal is electrically connected with the second output terminal. The acquisition instrument can be connected with the first acquisition terminal and the reference acquisition terminal to acquire potential, current, impedance and other information of the first pole piece, the information of the first pole piece can be truly reflected, the authenticity of a data source is improved, potential safety hazards of the battery cell are timely warned, and the safety performance of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell and an electrical device. Background Technology

[0002] Currently, with the rapid development of new energy technologies, battery cells have been widely used in electronic devices, electric vehicles, electric two-wheelers, power tools, and other fields. To ensure the safety and electrical performance of battery cells during use, their performance can be assessed by collecting data. Therefore, higher requirements are placed on the accuracy of battery cell information collection. Summary of the Invention This application provides a battery cell and an electrical device to improve the accuracy of battery cell data acquisition.

[0003] In a first aspect, embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, and a reference electrode. The housing is provided with a first output terminal, a first acquisition terminal, and a reference acquisition terminal. The electrode assembly and the reference electrode are housed within the housing. The electrode assembly includes a first electrode plate, a first electrode tab, and a first auxiliary electrode tab. The first electrode tab and the first auxiliary electrode tab are both connected to the first electrode plate. The first electrode tab is electrically connected to the first output terminal, the first auxiliary electrode tab is electrically connected to the first acquisition terminal, and the reference electrode is electrically connected to the reference acquisition terminal.

[0004] In one or more of the above optional embodiments, by connecting the first electrode plate to the first tab and the first auxiliary tab, connecting the first tab to the first output terminal, connecting the first auxiliary tab to the first acquisition terminal, and the battery cell also having a reference electrode connected to the reference acquisition terminal, the potential, current, impedance, and other information of the first electrode plate can be collected by connecting the first acquisition terminal and the reference acquisition terminal with a data acquisition instrument. This can accurately reflect the information of the first electrode plate. Since the first auxiliary tab does not participate in the input and output of electrical energy of the battery cell, the potential, current, impedance, and other data of the first electrode plate can be collected in real time when the battery cell is working. This can eliminate the interference of the second electrode plate on the data collection of the first electrode plate, improve the authenticity of the data source, and provide timely warning of potential safety hazards of the battery cell, thereby improving the safety performance of the battery cell.

[0005] In some embodiments of the first aspect of this application, the first tab and the first auxiliary tab are located on different sides of the electrode assembly.

[0006] In one or more of the above optional embodiments, by placing the first tab and the first auxiliary tab on different sides of the electrode assembly, the risk of interference between the first tab and the first auxiliary tab can be reduced, thereby reducing the risk of interference between the two circuits of cell input and output power and electrode data acquisition, thereby improving the reliability and safety of cell charging and discharging, and improving the accuracy of electrode data acquisition.

[0007] In some embodiments of the first aspect of this application, the first output terminal and the first acquisition terminal are respectively located at opposite ends of the housing along the first direction, and the first electrode tab and the first auxiliary electrode tab are respectively connected to opposite ends of the first electrode plate along the first direction.

[0008] In one or more of the above optional embodiments, the first output terminal and the first acquisition terminal are respectively located at opposite ends of the housing along the first direction, and the first tab and the first auxiliary tab are respectively connected to opposite ends of the first electrode along the first direction. This facilitates the connection between the first output terminal and the first tab, as well as between the first acquisition terminal and the first auxiliary tab, and also reduces the risk of interference between the first tab and the first auxiliary tab. This reduces the risk of interference between the two circuits of cell input and output power and electrode data acquisition, thereby improving the reliability and safety of cell charging and discharging, and enhancing the accuracy of electrode data acquisition.

[0009] In some embodiments of the first aspect of this application, the first electrode includes a first current collector and a first active material layer. The first active material layer is disposed on at least one side of the thickness direction of the first current collector. Both the first electrode tab and the first auxiliary electrode tab are connected to the first current collector. The end of the first electrode tab connected to the first current collector is the first end, and the end of the first auxiliary electrode tab connected to the first current collector is the second end. The width of the first end is W1 along the width direction of the first electrode tab, and the width of the second end is W2 along the width direction of the first auxiliary electrode tab, where 2≤W1 / W2≤10.

[0010] In one or more of the above optional embodiments, by ensuring that W1 / W2 is greater than or equal to 2, the width of the second end of the first auxiliary electrode is not too large compared to the width of the first end of the first electrode, thereby reducing the space occupied by the first auxiliary electrode and thus reducing the energy density loss of the battery cell caused by the setting of the first auxiliary electrode; by ensuring that W1 / W2 is less than or equal to 10, the width of the second end of the first auxiliary electrode is not too small compared to the width of the first end of the first electrode, which facilitates the manufacturing and forming of the first electrode and the first auxiliary electrode from a process perspective and reduces the process difficulty; therefore, 2≤W1 / W2≤10 is beneficial to reducing the process difficulty of the battery cell and enabling the battery cell to have better energy density.

[0011] In some embodiments of the first aspect of this application, 2≤W1 / W2≤6.

[0012] In one or more of the above optional embodiments, by ensuring that W1 / W2 is greater than or equal to 2, the width of the second end of the first auxiliary electrode is not too large compared to the width of the first end of the first electrode, thereby reducing the space occupied by the first auxiliary electrode and thus reducing the energy density loss of the battery cell caused by the setting of the first auxiliary electrode; by ensuring that W1 / W2 is less than or equal to 6, the width of the second end of the first auxiliary electrode is not too small compared to the width of the first end of the first electrode, which facilitates the manufacturing and forming of the first electrode and the first auxiliary electrode from a process perspective, further reducing the process difficulty; therefore, 2≤W1 / W2≤6 is beneficial to further reduce the process difficulty of the battery cell and enable the battery cell to have better energy density.

[0013] In some embodiments of the first aspect of this application, the electrode assembly is a wound structure; there are multiple first electrodes, which are arranged at intervals along the winding direction of the electrode assembly, and are stacked and electrically connected.

[0014] In one or more of the above optional embodiments, the electrode assembly includes a plurality of first tabs arranged at intervals along the winding direction, and the plurality of first tabs are stacked and electrically connected, which is beneficial to improving the overcurrent capacity of the battery cell.

[0015] In some embodiments of the first aspect of this application, the electrode assembly is a wound structure; there are multiple first auxiliary electrodes, which are arranged at intervals along the winding direction, and are stacked and electrically connected.

[0016] In one or more of the above optional embodiments, the wound electrode assembly includes a plurality of first auxiliary electrodes arranged at intervals along the winding direction. The plurality of first auxiliary electrodes are stacked and electrically connected, which facilitates the manufacturing and forming of the electrode assembly. The strength of the plurality of first auxiliary electrodes after being stacked and connected is better, reducing the risk of breakage of the first auxiliary electrodes and improving the reliability of electrode data acquisition.

[0017] In some embodiments of the first aspect of this application, the electrode assembly includes a plurality of first electrode plates stacked together, each first electrode plate being connected to at least one of a first electrode tab and a first auxiliary electrode tab; there are a plurality of first electrode tabs, each first electrode plate being connected to at most one first electrode tab, and the plurality of first electrode tabs being stacked together and electrically connected.

[0018] In one or more of the above optional embodiments, the electrode assembly includes multiple first tabs, which are stacked and electrically connected, which helps to improve the overcurrent capacity of the battery cell.

[0019] In some embodiments of the first aspect of this application, the electrode assembly includes a plurality of first electrode plates stacked together, each first electrode plate being connected to at least one of a first electrode tab and a first auxiliary electrode tab; there are a plurality of first auxiliary electrode tabs, each first electrode plate being connected to at most one first auxiliary electrode tab, and the plurality of first auxiliary electrode tabs being stacked together and electrically connected.

[0020] In one or more of the above optional embodiments, the electrode assembly includes multiple first auxiliary electrodes. The strength of the multiple first auxiliary electrodes stacked and connected is better, reducing the risk of breakage of the first auxiliary electrodes and improving the reliability of information acquisition of the first electrode.

[0021] In some embodiments of the first aspect of this application, the housing is provided with a second output terminal and a second acquisition terminal; the electrode assembly includes a second electrode plate, a second electrode tab and a second auxiliary electrode tab, the second electrode plate and the first electrode plate have opposite polarities, the second electrode tab and the second auxiliary electrode tab are both connected to the second electrode plate, the second electrode tab is electrically connected to the second output terminal, and the second auxiliary electrode tab is electrically connected to the second acquisition terminal.

[0022] In one or more of the above optional embodiments, by connecting the second electrode and the second auxiliary electrode to the second electrode, connecting the second electrode and the second output terminal, connecting the second auxiliary electrode to the second acquisition terminal, and connecting the reference electrode to the reference acquisition terminal, the potential, current, impedance and other information of the second electrode can be collected by connecting the acquisition instrument to the second acquisition terminal and the reference acquisition terminal. This can accurately reflect the information of the second electrode. Since the second auxiliary electrode does not participate in the input and output of electrical energy of the battery cell, the potential, current, impedance and other data of the second electrode can be collected in real time when the battery cell is working. This eliminates the interference of the first electrode on the data of the second electrode, improves the authenticity of the data source, and provides timely warning of potential safety hazards of the battery cell, thereby helping to improve the safety performance of the battery cell.

[0023] In some embodiments of the first aspect of this application, the second electrode tab and the second auxiliary electrode tab are located on different sides of the electrode assembly.

[0024] In one or more of the above optional embodiments, by placing the second electrode and the second auxiliary electrode on different sides of the electrode assembly, the risk of interference between the second electrode and the second auxiliary electrode can be reduced, thereby reducing the risk of interference between the two circuits of cell input and output power and electrode data acquisition, thereby improving the reliability and safety of cell charging and discharging, and improving the accuracy of electrode data acquisition.

[0025] In some embodiments of the first aspect of this application, the second output terminal and the second acquisition terminal are respectively located at opposite ends of the housing along the first direction, and the second electrode and the second auxiliary electrode are respectively connected to opposite ends of the second electrode along the first direction.

[0026] In one or more of the above optional embodiments, the second output terminal and the second acquisition terminal are respectively located at opposite ends of the housing along the first direction, and the second tab and the second auxiliary tab are respectively connected to opposite ends of the second electrode along the first direction. This facilitates the connection between the second output terminal and the second tab, as well as the second acquisition terminal and the second auxiliary tab, and also reduces the risk of interference between the second tab and the second auxiliary tab. This reduces the risk of interference between the two circuits of cell input and output power and electrode data acquisition, thereby improving the reliability and safety of cell charging and discharging, and enhancing the accuracy of electrode data acquisition.

[0027] In some embodiments of the first aspect of this application, the second electrode includes a second current collector and a second active material layer. The second active material layer is disposed on at least one side of the thickness direction of the second current collector. The second electrode tab and the second auxiliary electrode tab are uniformly connected to the second current collector. The end of the second electrode tab connected to the second current collector is the third end, and the end of the second auxiliary electrode tab connected to the second current collector is the fourth end. The width of the third end is W3 along the width direction of the second electrode tab, and the width of the fourth end is W4 along the width direction of the second auxiliary electrode tab, where 2≤W3 / W4≤10.

[0028] In one or more of the above optional embodiments, by ensuring that W3 / W4 is greater than or equal to 2, the width of the fourth end of the second auxiliary electrode is not too large compared to the width of the third end of the second electrode, thereby reducing the space occupied by the second auxiliary electrode and thus reducing the energy density loss of the battery cell caused by the installation of the second auxiliary electrode; by ensuring that W3 / W4 is less than or equal to 10, the width of the fourth end of the second auxiliary electrode is not too small compared to the width of the third end of the second electrode, which facilitates the manufacturing and forming of the second electrode and the second auxiliary electrode from a process perspective and reduces the process difficulty; therefore, 2≤W3 / W4≤10 is beneficial to reducing the process difficulty of the battery cell and enabling the battery cell to have better energy density.

[0029] In some embodiments of the first aspect of this application, 2≤W3 / W4≤6.

[0030] In one or more of the above optional embodiments, by ensuring that W3 / W4 is greater than or equal to 2, the width of the fourth end of the second auxiliary electrode is not too large compared to the width of the third end of the second electrode, thereby reducing the space occupied by the second auxiliary electrode and thus reducing the energy density loss of the battery cell caused by the installation of the second auxiliary electrode; by ensuring that W3 / W4 is less than or equal to 6, the width of the fourth end of the second auxiliary electrode is not too small compared to the width of the third end of the second electrode, which facilitates the manufacturing and forming of the second electrode and the second auxiliary electrode from a process perspective, further reducing the process difficulty; therefore, 2≤W3 / W4≤6 is beneficial to further reduce the process difficulty of the battery cell and enable the battery cell to have better energy density.

[0031] In some embodiments of the first aspect of this application, the electrode assembly is a wound structure; there are multiple second electrodes, which are arranged at intervals along the winding direction of the electrode assembly, and are stacked and electrically connected.

[0032] In one or more of the above optional embodiments, the electrode assembly includes a plurality of second tabs arranged at intervals along the winding direction, and the plurality of second tabs are stacked and electrically connected, which is beneficial to improving the overcurrent capacity of the battery cell.

[0033] In some embodiments of the first aspect of this application, the electrode assembly is a wound structure; there are multiple second auxiliary electrodes, which are arranged at intervals along the winding direction, and are stacked and electrically connected.

[0034] In one or more of the above optional embodiments, the electrode assembly includes a plurality of second auxiliary electrodes arranged at intervals along the winding direction. The plurality of second auxiliary electrodes are stacked and electrically connected, which facilitates the manufacturing and forming of the electrode assembly. The strength of the plurality of second auxiliary electrodes after being stacked and connected is better, reducing the risk of breakage of the second auxiliary electrodes and improving the reliability of data acquisition of the second electrode.

[0035] In some embodiments of the first aspect of this application, the electrode assembly includes a plurality of second electrodes stacked together, each second electrode being connected to at least one of a second electrode tab and a second auxiliary electrode tab; there are multiple second electrodes tabs, each second electrode being connected to at most one second electrode tab, and the plurality of second electrodes tabs are stacked together and electrically connected.

[0036] In one or more of the above optional embodiments, the electrode assembly includes multiple second tabs, which are stacked and electrically connected, which helps to improve the overcurrent capability of the battery cell.

[0037] In some embodiments of the first aspect of this application, the electrode assembly includes a plurality of second electrode plates stacked together, each second electrode plate being connected to at least one of a second electrode tab and a second auxiliary electrode tab; there are a plurality of second auxiliary electrode tabs, each second electrode plate being connected to at most one second auxiliary electrode tab, and the plurality of second auxiliary electrode tabs being stacked together and electrically connected.

[0038] In one or more of the above optional embodiments, the electrode assembly includes multiple second auxiliary electrodes. The strength of the multiple second auxiliary electrodes stacked and connected is better, reducing the risk of breakage of the second auxiliary electrodes and improving the reliability of data acquisition of the second electrode.

[0039] In some embodiments of the first aspect of this application, the first auxiliary electrode and the second auxiliary electrode are located on the same side of the electrode assembly.

[0040] In one or more of the above optional embodiments, by having the first auxiliary tab and the second auxiliary tab located on the same side of the electrode assembly, it is beneficial to reduce the size of the electrode assembly, thereby reducing the energy density loss of the battery cell and enabling the battery cell to have a higher energy density.

[0041] In some embodiments of the first aspect of this application, the electrode assembly further includes a second electrode and an isolation membrane, the second electrode having the opposite polarity to the first electrode, and the isolation membrane insulatingly separating the first electrode and the second electrode; the reference electrode includes at least one reference electrode disposed between the first electrode and the second electrode, the reference electrode including a reference current collector, a first insulating layer and a signal acquisition layer, the reference current collector having a first surface facing the isolation membrane and a second surface facing away from the isolation membrane along the thickness direction of the reference current collector, the signal acquisition layer being disposed on the first surface, the first insulating layer being disposed on the second surface, and the reference current collector being electrically connected to a reference acquisition terminal.

[0042] In one or more of the above optional embodiments, by disposing the signal acquisition layer on the first surface of the reference current collector facing the isolation film, the isolation film can insulatingly separate the signal acquisition layer and the electrode, reducing the risk of reference signals provided by the electrode interference signal acquisition layer and improving the accuracy of data acquisition from the electrode. A first insulating layer is disposed on the second surface of the reference current collector facing away from the isolation film. This first insulating layer can insulatingly separate the reference current collector and the electrode, reducing the risk of reference signals from the electrode interference signal acquisition layer and improving the accuracy of data acquisition from the electrode.

[0043] In some embodiments of the first aspect of this application, a first insulating layer is further provided on the first surface, and the first insulating layer and the signal acquisition layer disposed on the first surface are arranged side by side.

[0044] In one or more of the above optional embodiments, the first surface is further provided with a first insulating layer. A portion of the first surface is covered by the first insulating layer, and another portion is covered by the signal acquisition layer. This prevents the signal acquisition layer from becoming too large, which helps reduce the manufacturing cost of the reference electrode. When the first insulating layer and the signal acquisition layer are arranged side-by-side, the signal acquisition layer can be fully electrically connected to the reference current collector, which is beneficial for acquiring data from the electrode.

[0045] In some embodiments of the first aspect of this application, the electrode assembly is a wound structure, and the first insulating layer and the signal acquisition layer disposed on the first surface are arranged along the winding axis of the electrode assembly.

[0046] In one or more of the above optional embodiments, in the embodiment where the electrode assembly is a wound structure, the first insulating layer and the signal acquisition layer disposed on the first surface are arranged along the winding axis of the electrode assembly, which facilitates the connection between the reference electrode and the reference acquisition terminal, and is beneficial for the signal acquisition layer to form an overlapping area with the active material layer of the electrode, thereby realizing effective data acquisition from the electrode.

[0047] In some embodiments of the first aspect of this application, the first electrode includes a first current collector and a first active material layer. The first active material layer is disposed on at least one side of the first current collector in the thickness direction. The first electrode tab and the first auxiliary electrode tab are both connected to the first current collector. Along the winding direction of the electrode assembly, the width of the end of the first auxiliary electrode tab connected to the first current collector is the same as the width of the signal acquisition layer.

[0048] In one or more of the above optional embodiments, the width of the end of the first auxiliary electrode tab connected to the first current collector along the winding direction of the electrode assembly is the same as the width of the signal acquisition layer, which facilitates the manufacturing and shaping of the reference electrode.

[0049] In some embodiments of the first aspect of this application, along the winding axis of the electrode assembly, the size of the first electrode is L1, and the size of the signal acquisition layer is L. 11 2.5≤L1 / L 11 ≤10.

[0050] In one or more of the above optional implementations, via L1 / L 11 A value greater than or equal to 2.5 facilitates the formation of an overlapping area between the signal acquisition layer and the active material layer of the first electrode, thus enabling effective data acquisition from the first electrode; through L1 / L 11 A value less than or equal to 10 ensures that the signal acquisition layer's dimensions along the winding axis are not excessively large. This helps reduce the space occupied by the signal acquisition layer and minimizes energy density loss in the battery cell due to the presence of a reference electrode. Therefore, 2.5 ≤ L1 / L 11 ≤10 facilitates effective data collection from the electrode plates and enables the battery cell to have a high energy density.

[0051] In some embodiments of the first aspect of this application, 3 ≤ L1 / L 11 ≤5.

[0052] In one or more of the above optional implementations, via L1 / L 11 A value greater than or equal to 3 facilitates the formation of an overlapping area between the signal acquisition layer and the active material layer of the first electrode, thus enabling effective data acquisition from the first electrode; through L1 / L 11A value less than or equal to 5 ensures that the size of the signal acquisition layer along the winding axis is not too large, which helps to further reduce the space occupied by the signal acquisition layer and further reduce the energy density loss of the cell due to the setting of the reference electrode. Therefore, 3 ≤ L1 / L 11 ≤5, which facilitates effective acquisition of signals from the electrode plates and enables the battery cell to have higher energy density.

[0053] In some embodiments of the first aspect of this application, the thickness of the signal acquisition layer is h1, where 0.5 μm ≤ h1 ≤ 10 μm.

[0054] In one or more of the above optional embodiments, h1 being greater than or equal to 0.5 μm is beneficial for acquiring electrode data; h1 being less than or equal to 10 μm ensures that the thickness of the signal acquisition layer is not too large, reducing the space occupied by the signal acquisition layer, which helps to reduce the energy density loss of the cell caused by the setting of the reference electrode. In addition, the thickness of the signal acquisition layer is not too large, which can also reduce the thickness difference between different areas of the electrode assembly, reduce the risk of electrode breakage caused by excessive thickness difference of the electrode assembly, and improve the safety performance of the cell. Therefore, 0.5 μm ≤ h1 ≤ 10 μm facilitates effective acquisition of electrode signals and enables the cell to have higher energy density and safety performance.

[0055] In some embodiments of the first aspect of this application, 1μm≤h1≤3μm.

[0056] In one or more of the above optional embodiments, h1 being greater than or equal to 1μm is beneficial for acquiring electrode signals; h1 being less than or equal to 3μm makes the thickness of the signal acquisition layer smaller, further reducing the space occupied by the signal acquisition layer, which is beneficial for further reducing the energy density loss of the cell caused by the setting of the reference electrode, and the thickness of the signal acquisition layer is not too large, which can also reduce the thickness difference between different areas of the electrode assembly, reduce the risk of electrode breakage due to excessive thickness difference of the electrode assembly, and improve the safety performance of the cell. Therefore, 1μm≤h1≤3μm facilitates effective acquisition of electrode signals, and enables the cell to have higher energy density and safety performance.

[0057] In some embodiments of the first aspect of this application, the material of the signal acquisition layer includes at least one of lithium titanate, titanium dioxide, molybdenum disulfide, and tin oxide.

[0058] In one or more of the above optional embodiments, the material of the signal acquisition layer includes at least one of lithium titanate, titanium dioxide, molybdenum disulfide, and tin oxide, which is beneficial for effective and accurate detection of electrode data.

[0059] In some embodiments of the first aspect of this application, the thickness of the first insulating layer is h2, where 1μm≤h2≤10μm.

[0060] In one or more of the above optional embodiments, by making h2 greater than or equal to 1μm, the thickness of the first insulating layer is relatively large, resulting in better insulation performance of the first insulating layer, reducing the risk of reference signals in the electrode interference signal acquisition layer, and improving the accuracy of electrode data acquisition. By making h2 less than or equal to 10μm, the thickness of the first insulating layer is not too large, reducing the space occupied by the first insulating layer, which helps to reduce the energy density loss of the cell caused by the setting of reference electrodes. Furthermore, by ensuring that the thickness of the first insulating layer is not too large, it also reduces the thickness difference between different areas of the electrode assembly, reducing the risk of electrode breakage caused by excessive thickness difference of the electrode assembly, and improving the safety performance of the cell. Therefore, 1μm≤h2≤10μm is beneficial to improving the accuracy of electrode data acquisition and enabling the cell to have higher energy density and safety performance.

[0061] In some embodiments of the first aspect of this application, 3μm≤h2≤5μm.

[0062] In one or more of the above optional embodiments, by making h2 greater than or equal to 3μm, the thickness of the first insulating layer is increased, resulting in better insulation performance of the first insulating layer. This further reduces the risk of reference signals in the electrode interference signal acquisition layer, thereby further improving the accuracy of electrode signal acquisition. By making h2 less than or equal to 5μm, the thickness of the first insulating layer is decreased, further reducing the space occupied by the first insulating layer. This helps to further reduce the energy density loss of the cell caused by the setting of reference electrodes, and the thickness of the first insulating layer is not too large. It can also further reduce the thickness difference between different areas of the electrode assembly, further reducing the risk of electrode breakage caused by excessive thickness difference of the electrode assembly, and improving the safety performance of the cell. Therefore, 3μm≤h2≤5μm is beneficial to further improve the accuracy of electrode data acquisition and enable the cell to have higher energy density and safety performance.

[0063] In some embodiments of the first aspect of this application, the material of the first insulating layer includes at least one of polyurethane, polyimide, polyethylene terephthalate, and epoxy resin.

[0064] In one or more of the above optional embodiments, the material of the first insulating layer includes at least one of polyurethane, polyimide, polyethylene terephthalate, and epoxy resin, so that the first insulating layer has good insulation performance and a long service life.

[0065] In some embodiments of the first aspect of this application, the thickness of the reference current collector is h3, where 1 μm ≤ h3 ≤ 7 μm.

[0066] In one or more of the above optional embodiments, by making h3 greater than or equal to 1μm, the thickness of the reference current collector is relatively large, which gives the reference current collector better strength, thereby improving the mechanical properties of the reference electrode. It also gives the reference current collector better conductivity, which facilitates effective acquisition of the electrode signal. By making h3 less than or equal to 7μm, the thickness of the reference current collector is not too large, reducing the space occupied by the reference current collector. This helps to reduce the energy density loss of the cell caused by the setting of the reference electrode. In addition, the thickness of the reference current collector is not too large, which also reduces the thickness difference between different areas of the electrode assembly, reducing the risk of electrode breakage caused by excessive thickness difference of the electrode assembly, and improving the safety performance of the cell. Therefore, 1μm≤h3≤7μm is beneficial to improving the accuracy of electrode signal acquisition and giving the cell higher energy density and safety performance.

[0067] In some embodiments of the first aspect of this application, 3.5 μm ≤ h3 ≤ 4.5 μm.

[0068] In one or more of the above optional embodiments, by making h3 greater than or equal to 3.5μm, the thickness of the reference current collector is increased, resulting in better strength and improved mechanical properties of the reference electrode. It also provides better conductivity, facilitating effective signal acquisition from the electrode. Conversely, by making h3 less than or equal to 4.5μm, the thickness of the reference current collector is reduced, decreasing the space occupied by it. This helps to further reduce energy density loss in the cell due to the reference electrode, and the thickness of the reference current collector is not excessive. It also reduces the thickness difference between different areas of the electrode assembly, further lowering the risk of electrode breakage due to excessive thickness differences and improving the cell's safety performance. Therefore, 3.5μm≤h3≤4.5μm is beneficial for further improving the accuracy of electrode data acquisition and for giving the cell higher energy density and safety performance.

[0069] In some embodiments of the first aspect of this application, the reference electrode includes a plurality of reference electrodes stacked together, reference current collectors of the plurality of reference electrodes stacked together and electrically connected to form a connection portion, and a reference acquisition terminal is connected to the connection portion.

[0070] In one or more of the above optional embodiments, the reference electrode includes multiple reference electrodes, and the reference current collectors of the multiple reference electrodes are stacked and electrically connected to form a connection part. The reference acquisition terminal is connected to the connection part. The connection part has good strength, which facilitates connection with the acquisition terminal and can improve the stability of the connection between the acquisition terminal and the reference electrode.

[0071] In some embodiments of the first aspect of this application, at least one first electrode and / or at least one second electrode are disposed between two adjacent reference electrodes.

[0072] In one or more of the above optional embodiments, by providing at least one first electrode and / or at least one second electrode between two adjacent reference electrodes, it is beneficial to distribute the multiple reference electrodes more evenly, alleviate the problem of excessive distance between the first and second electrodes caused by the provision of reference electrodes, alleviate the problem of reduced cycle performance of the battery cell caused by the provision of reference electrodes, and thus improve the electrical performance of the battery cell.

[0073] Secondly, embodiments of this application provide an electrical device, which includes the battery cell provided in any embodiment of the first aspect. Attached Figure Description

[0074] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0075] Figure 1 Axonometric views of the battery cell provided for some embodiments of this application; Figure 2 for Figure 1 A sectional view along line A1-A1; Figure 3 for Figure 1 A sectional view along line A2-A2; Figure 4 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application; Figure 5 for Figure 4 A sectional view along line A3-A3; Figure 6 for Figure 4 A sectional view along line A4-A4; Figure 7 for Figure 1 A sectional view along line A5-A5; Figure 8 for Figure 4 A sectional view along line A6-A6; Figure 9 This is a schematic diagram of the battery cell and the data acquisition connection; Figure 10 This is a schematic diagram showing the electrode assembly and reference electrode after being assembled according to some embodiments of this application; Figure 11 This is a schematic diagram of the structure of a wound electrode assembly provided in some embodiments of this application; Figure 12 for Figure 11 Another structural schematic diagram of the wound electrode assembly; Figure 13This is a schematic diagram of the structure of a stacked electrode assembly provided in some embodiments of this application; Figure 14 This is a schematic diagram of the unfolded first electrode sheet provided in some embodiments of this application; Figure 15 This is a schematic diagram of the structure of a stacked electrode assembly provided in some embodiments of this application; Figure 16 This is a schematic diagram of the unfolded second pole piece provided in some embodiments of this application; Figure 17 Cross-sectional views of the wound electrode assembly and reference electrode after being assembled according to some embodiments of this application; Figure 18 for Figure 17 A schematic diagram of the reference electrode structure in the diagram; Figure 19 Cross-sectional views of the wound electrode assembly and reference electrode after being assembled, as provided in other embodiments of this application; Figure 20 for Figure 19 A schematic diagram of the reference electrode structure in the diagram; Figure 21 for Figure 20 A schematic diagram of the reference electrode from another perspective.

[0076] Icons: 100-Cell; 10-Housing; 11-First Output Terminal; 12-Second Output Terminal; 13-First Acquisition Terminal; 14-Reference Acquisition Terminal; 15-Second Acquisition Terminal; 10a-First Terminal; 10c-Third Terminal; 10d-First Conductive Component; 10e-Second Conductive Component; 10f-Third Conductive Component; 10g-Fourth Conductive Component; 10h-Fifth Conductive Component; 10i-Fourth Terminal; 10k-Fifth Terminal; 20-Electrode Assembly; 21-First Electrode; 211-First Current Collector; 212-First Active Material Layer; 22-Second Electrode; 221-Second Current Collector; 22 2-Second active material layer; 23-Separating membrane; 24-First tab; 241-First end; 25-Second tab; 251-Third end; 26-First auxiliary tab; 261-Second end; 27-Second auxiliary tab; 271-Fourth end; 30-Reference electrode; 31-Reference electrode sheet; 311-Reference current collector; 311a-First region; 311b-Second region; 3111-First surface; 3112-Second surface; 312-First insulating layer; 313-Signal acquisition layer; 200-Acquisition device; X1-First direction; X2-Wound axis direction; X3-Wound direction; Q-Connecting part. Detailed Implementation

[0077] 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 and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0078] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

[0079] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0080] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0081] Currently, judging from market trends, the application of battery cells is becoming increasingly widespread. Battery cells are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage devices, and many other fields. As the application areas of battery cells continue to expand, the market demand is also constantly increasing.

[0082] To improve the lifespan and safety performance of battery cells, it is necessary to monitor data such as the potential, current, and impedance of the positive and negative terminals of the battery cells for the BMS system to manage the health status of the battery cells.

[0083] The traditional acquisition method collects data such as potential, current and impedance of the battery cell in the coupled state of the positive and negative poles. The traditional acquisition method has the following limitations: (1) Since the traditional acquisition method collects data in the coupled state of the positive and negative poles of the battery cell, the data in the coupled state cannot fully reflect the electrical performance and safety performance of the battery cell. In order to understand the electrical performance and safety performance of the battery cell more accurately, it is necessary to further obtain data such as potential, current and impedance of the positive pole and the anode and negative pole. This is something that the traditional signal acquisition system cannot do; (2) The traditional signal acquisition system often cannot collect the potential, current and impedance data of the positive and negative poles in real time when the car is working. This greatly limits the real-time nature of the data source and cannot provide timely warning of the safety hazards of the battery cell.

[0084] Based on the above considerations, in order to improve the accuracy of battery cell data acquisition, this application provides a battery cell including a housing, an electrode assembly, and a reference electrode. The housing is provided with a first output terminal, a first acquisition terminal, and a reference acquisition terminal. The electrode assembly and the reference electrode are housed within the housing. The electrode assembly includes a first electrode plate, a first electrode tab, and a first auxiliary electrode tab. The first electrode tab and the first auxiliary electrode tab are both connected to the first electrode plate. The first electrode tab is electrically connected to the first output terminal, the first auxiliary electrode tab is electrically connected to the first acquisition terminal, and the reference electrode is electrically connected to the reference acquisition terminal.

[0085] By connecting the first electrode plate to the first tab and the first auxiliary tab, connecting the first tab to the first output terminal, and connecting the first auxiliary tab to the first acquisition terminal, and by also providing a reference electrode connected to the reference acquisition terminal, the potential, current, impedance, and other information of the first electrode plate can be collected by connecting the first acquisition terminal and the reference acquisition terminal with a data acquisition instrument. This accurately reflects the information of the first electrode plate. Since the first auxiliary tab does not participate in the input and output of electrical energy of the battery cell, the potential, current, impedance, and other data of the first electrode plate can be collected in real time when the battery cell is working. This improves the authenticity of the data source and enables timely warning of potential safety hazards in the battery cell, thereby improving the safety performance of the battery cell.

[0086] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical equipment such as electric two-wheelers, power tools, drones, and energy storage devices. Battery cells conforming to the operating conditions of this application can also be used as the power supply system for electrical equipment.

[0087] This application provides an electrical device that uses a battery cell 100 as a power source. The electrical device can be, but is not limited to, electronic devices, power tools, electric vehicles, drones, and energy storage devices. Electronic devices can include mobile phones, tablets, laptops, etc.; power tools can include electric drills, chainsaws, etc.; and electric vehicles can include electric cars, electric motorcycles, electric bicycles, etc.

[0088] likeFigures 1-6 As shown, the battery cell 100 includes a housing 10 and an electrode assembly 20, the electrode assembly 20 being housed within the housing 10.

[0089] The casing 10 can be a rigid casing, such as a steel casing or an aluminum casing, forming a steel-cased battery or an aluminum-cased battery.

[0090] For example, such as Figures 1-3 As shown, the battery cell 100 is a rigid-cased battery cell. A first terminal 10a is insulatedly disposed on the casing 10 of the battery cell 100. The electrode assembly 20 includes a first tab 24 and a second tab 25 with opposite polarities. The first terminal 10a can be electrically connected to the first tab 24, thus forming a first output terminal 11 of the battery cell 100. The second tab 25 can be electrically connected to the casing 10, thus forming a second output terminal 12 of the battery cell 100. The first output terminal 11 and the second output terminal 12 are used to connect the battery cell 100 to an external device for charging and discharging. In other embodiments, the battery cell 100 is insulated with a first terminal 10a and a second terminal (not shown in the figure). The first terminal 10a and the second terminal are respectively connected to a first tab 24 and a second tab 25 of opposite polarity of the electrode assembly 20, so that the first terminal 10a and the second terminal serve as a first output terminal 11 and a second output terminal 12 of opposite polarity of the battery cell 100, for connecting the battery cell 100 to an external device for charging and discharging. Figures 1-3 The diagram shows a case where the first tab 24 and the first terminal 10a are electrically connected, the second tab 25 and the housing 10 are electrically connected, and the first terminal 10a and the housing 10 form the first output terminal 11 and the second output terminal 12 of the cell 100 with opposite polarities, respectively.

[0091] The casing 10 can also be made of a softer material, such as an aluminum-plastic film or a steel-plastic film, forming a soft-pack battery cell. Figures 4-6 As shown, the battery cell 100 is a pouch battery cell. The first tab 24 and the second tab 25 of the electrode assembly 20, which have opposite polarities, are connected to the first conductive element 10d and the second conductive element 10e, respectively. A portion of the first conductive element 10d is located inside the housing 10 and is connected to the first tab 24 of the electrode assembly 20. Another portion of the first conductive element 10d extends outside the housing 10 to form a first output terminal 11 of the battery cell 100. A portion of the second conductive element 10e is located inside the housing 10 and is connected to the second tab 25 of the electrode assembly 20. Another portion of the second conductive element 10e extends outside the housing 10 to form a second output terminal 12 of the battery cell 100. The first output terminal 11 and the second output terminal 12 are used to connect the battery cell 100 to an external device for charging and discharging.

[0092] The electrode assembly 20 includes a first electrode 21, a second electrode 22, and a separator 23. The first electrode 21 and the second electrode 22 have opposite polarities, that is, one of the first electrode 21 and the second electrode 22 is a positive electrode, and the other is a negative electrode. A separator 23 is disposed between the first electrode 21 and the second electrode 22. The separator 23 insulates and isolates the first electrode 21 and the second electrode 22, reducing the risk of short circuit due to contact between the first electrode 21 and the second electrode 22.

[0093] The electrode assembly 20 can also be a stacked structure. The electrode assembly 20 includes a first electrode 21, a second electrode 22 and a separator 23 stacked together, with the separator 23 disposed between adjacent first electrode 21 and second electrode 22.

[0094] Electrode assembly 20 can be wound into a structure ( Figure 10 , Figure 11 As shown in the figure, the electrode assembly 20 is formed by stacking the first electrode 21, the first separator 23, the second electrode 22 and the other separator 23 in sequence, or by winding the first separator 21, the other separator 23 and the second electrode 22 in sequence.

[0095] The separator 23 provides insulation between the two electrodes with opposite polarities, reducing the risk of short circuit in the cell 100. The material of the separator 23 may include PP (polypropylene) or PE (polyethylene), etc.

[0096] like Figure 2 and Figure 3 , Figure 5 and Figure 6 As shown, the first electrode 21 includes a first current collector 211 and a first active material layer 212, with the first active material layer 212 disposed on at least one side of the first current collector 211. The second electrode 22 includes a second current collector 221 and a second active material layer 222, with the second active material layer 222 disposed on at least one side of the second current collector 221. One of the first current collector 211 and the second current collector 221 is a positive current collector, and the other is a negative current collector. The material of the negative current collector may include copper, and the material of the positive current collector may include aluminum, etc.

[0097] One of the first active material layer 212 and the second active material layer 222 is a positive electrode active material layer, and the other is a negative electrode active material layer. Specifically, if the first current collector 211 is a positive electrode current collector, then the second current collector 221 is a negative electrode current collector, the first active material layer 212 is a positive electrode active material layer, and the second active material layer 222 is a negative electrode active material layer. If the first current collector 211 is a negative electrode current collector, then the second current collector 221 is a positive electrode current collector, the first active material layer 212 is a negative electrode active material layer, and the second active material layer 222 is a positive electrode active material layer.

[0098] The positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode active material can be carbon or silicon, etc.

[0099] like Figure 2 and Figure 3 , Figure 5 and Figure 6 As shown, the electrode assembly 20 also includes a first tab 24 and a second tab 25. The first tab 24 is connected to the first electrode plate 21. The first current collector 211 of the first tab 24 and the first electrode plate 21 can be integrally formed. Alternatively, the first current collector 211 of the first tab 24 and the first electrode plate 21 can be separately arranged and connected, for example, by welding or using conductive adhesive. The second tab 25 is connected to the second electrode plate 22. The second current collector 221 of the second tab 25 and the second electrode plate 22 can be integrally formed. Alternatively, the second tab 25 and the second current collector 221 of the second electrode plate 22 can be separately arranged and connected, for example, by welding or using conductive adhesive.

[0100] The first tab 24 and the second tab 25 can be located on the same side of the electrode assembly 20, which helps to reduce the size of the electrode assembly 20 and enable the battery cell 100 to have a better energy density. Alternatively, the first tab 24 and the second tab 25 can be located on different sides of the electrode assembly 20, reducing the risk of short circuits and improving the safety performance of the battery cell 100. For example, the first tab 24 and the second tab 25 can be located on opposite sides of the electrode assembly 20.

[0101] In this embodiment, the housing 10 is provided with a first output terminal 11 and a second output terminal 12. The first electrode 24 is electrically connected to the first output terminal 11, and the second output terminal 12 is electrically connected to the second electrode 25. One of the first output terminal 11 and the second output terminal 12 is the positive output terminal of the battery cell 100, and the other is the negative output terminal of the battery cell 100. The first electrode terminal and the second electrode terminal can be connected to an external device to enable the battery cell 100 to charge and discharge.

[0102] In embodiments where the battery cell 100 is a rigid-cased battery cell, one of the first output terminal 11 and the second output terminal 12 can be the housing 10, and the other of the first output terminal 11 and the second output terminal 12 can be a first terminal 10a insulated on the housing 10. In embodiments where the battery cell 100 is a rigid-cased battery cell, the first output terminal 11 and the second output terminal 12 can also be a first terminal 10a and a second terminal insulated on the housing 10.

[0103] In an embodiment where the battery cell 100 is a pouch cell, the first output terminal 11 and the second output terminal 12 can be two first conductive elements 10d and second conductive elements 10e that extend from the sealing portion of the housing 10, respectively.

[0104] In this embodiment, the electrode assembly 20 further includes a first auxiliary electrode tab 26, which is connected to the first electrode plate 21. Specifically, the first auxiliary electrode tab 26 is connected to the first current collector 211 of the first electrode plate 21. The first auxiliary electrode tab 26 and the first current collector 211 can be integrally formed. Alternatively, the first auxiliary electrode tab 26 and the first current collector 211 can be separately configured and connected, for example, by welding or using conductive adhesive.

[0105] In this embodiment, the housing 10 is also provided with a first acquisition terminal 13. The first acquisition terminal 13 is electrically connected to the first auxiliary electrode 26.

[0106] In an embodiment where the battery cell 100 is a hard-shell battery cell, the housing 10 is also insulated with a third pole post 10c, the first auxiliary pole tab 26 and the third pole post 10c are electrically connected, and the third pole post 10c serves as the first acquisition terminal 13.

[0107] In embodiments where cell 100 is a pouch cell, cell 100 further includes a third conductive element 10f, such as... Figure 4 and Figure 5 As shown, a portion of the third conductive element 10f is electrically connected to the first auxiliary electrode 26 inside the housing 10, and another portion of the third conductive element 10f extends out of the housing 10 as the first acquisition terminal 13.

[0108] The battery cell 100 also includes a reference electrode 30, which is housed within the housing 10. The housing 10 is also provided with a reference acquisition terminal 14, and the reference electrode 30 is electrically connected to the reference acquisition terminal 14.

[0109] The housing 10 is also insulated with a third pole 10c, which is electrically connected to the reference electrode 30 and the fourth pole 10i. The fourth pole 10i serves as the reference acquisition terminal 14.

[0110] In embodiments where cell 100 is a pouch cell, cell 100 further includes a fourth conductive element 10g, such as... Figure 4 and Figure 8 As shown, a portion of the fourth conductive element 10g is electrically connected to the reference electrode 30 within the housing 10, and another portion of the fourth conductive element 10g extends out of the housing 10 as a reference acquisition terminal 14.

[0111] like Figure 9As shown, during the data acquisition process of the battery cell 100, the two connection terminals of the data acquisition instrument 200 can be connected to the first acquisition terminal 13 and the reference acquisition terminal 14 respectively, so that the data acquisition instrument 200 can acquire the data of the first electrode 21. The data acquisition instrument 200 can be a current-voltage multiplexer to acquire the potential and current data of the first electrode 21. The data acquisition instrument 200 can also be an electrochemical impedance spectroscopy instrument to acquire the impedance data of the first electrode 21. During the test, the reference signal of the reference electrode 30 is known, and the corresponding data of the first electrode 21 is obtained by subtracting the reference signal of the reference electrode 30 from the data acquired by the data acquisition instrument 200. For example, if it is necessary to collect the potential data of the first electrode 21, the potential of the first electrode 21 is obtained by subtracting the potential value of the reference electrode 30 from the potential data collected by the data acquisition instrument 200; if it is necessary to collect the current data of the first electrode 21, the current of the first electrode 21 is obtained by subtracting the current value of the reference electrode 30 from the current data collected by the data acquisition instrument 200; if it is necessary to collect the impedance data of the first electrode 21, the impedance of the first electrode 21 is obtained by subtracting the impedance value of the reference electrode 30 from the impedance data collected by the data acquisition instrument 200.

[0112] In this application, by connecting the first electrode 21 to the first tab 24 and the first auxiliary tab 26, the first tab 24 to the first output terminal 11, and the first auxiliary tab 26 to the first acquisition terminal 13, and the battery cell 100 is also provided with a reference electrode 30, which is connected to the reference acquisition terminal 14, the potential, current, impedance and other information of the first electrode 21 can be collected by the acquisition instrument 200 connected to the first acquisition terminal 13 and the reference acquisition terminal 14, so as to truly reflect the information of the first electrode 21. Since the first auxiliary tab 26 does not participate in the input and output of electrical energy of the battery cell 100, when the battery cell 100 is working, the potential, current, impedance and other data of the first electrode 21 can be collected in real time, which can eliminate the interference of the second electrode 22 on the data collection of the first electrode 21, improve the authenticity of the data source, and enable timely warning of potential safety hazards of the battery cell 100, thereby improving the safety performance of the battery cell 100.

[0113] In some embodiments, the first electrode tab 24 and the first auxiliary electrode tab 26 may be located on the same side of the electrode assembly 20, which facilitates the manufacturing and shaping of the first electrode tab 24 and the first auxiliary electrode tab 26.

[0114] like Figure 10As shown, in some embodiments, the first tab 24 and the first auxiliary tab 26 are located on different sides of the electrode assembly 20, which can reduce the risk of interference between the first tab 24 and the first auxiliary tab 26, thereby reducing the risk of interference between the two circuits of the cell 100's input and output of electrical energy and the electrode data acquisition, thus improving the reliability and safety of the cell 100's charging and discharging, and enhancing the accuracy of the electrode data acquisition. For example, if the first tab 24 and the first auxiliary tab 26 are respectively connected to the two opposite ends of the first electrode 21 along the first direction X1, then the first tab 24 and the first auxiliary tab 26 are respectively located on opposite sides of the electrode assembly 20 along the first direction X1.

[0115] Referring to the reference Figure 4 and 10 In some embodiments, the first output terminal 11 and the first acquisition terminal 13 are located at opposite ends of the housing 10 along the first direction X1, and the first electrode tab 24 and the first auxiliary electrode tab 26 are connected to opposite ends of the first electrode plate 21 along the first direction X1.

[0116] In an embodiment where the electrode assembly 20 has a wound structure, the first direction X1 is the winding axis direction X2 of the electrode assembly 20. In an embodiment where the electrode assembly 20 has a stacked structure, the first direction X1 can be any direction perpendicular to the stacking direction of the first electrode 21 and the second electrode 22.

[0117] The first electrode tab 24 is connected to the end of the first electrode plate 21 near the first output terminal 11, and the first auxiliary electrode tab 26 is connected to the end of the first electrode plate 21 near the first acquisition terminal 13.

[0118] The first output terminal 11 and the first acquisition terminal 13 are located at opposite ends of the housing 10 along the first direction X1. The first tab 24 and the first auxiliary tab 26 are respectively connected to opposite ends of the first electrode 21 along the first direction X1. This facilitates the connection between the first output terminal 11 and the first tab 24, and between the first acquisition terminal 13 and the first auxiliary tab 26. It also reduces the risk of interference between the first tab 24 and the first auxiliary tab 26, thereby reducing the risk of interference between the two circuits of the cell 100's input and output power and the electrode data acquisition. This improves the reliability and safety of the cell 100's charging and discharging, and enhances the accuracy of the electrode data acquisition.

[0119] In embodiments where the electrode assembly 20 has a wound structure, there may be one first tab 24, or there may be multiple first tabs 24. Figure 11As shown, in embodiments where there are multiple first tabs 24, the multiple first tabs 24 are arranged at intervals along the winding direction X3 of the electrode assembly 20, and the multiple first tabs 24 are stacked and electrically connected. Specifically, the multiple first tabs 24 are connected at intervals along the winding direction X3 to one end of the first current collector 211. The multiple first tabs 24 are stacked and electrically connected. After the multiple first tabs 24 are stacked, they can be electrically connected by means of conductive adhesive, welding, etc. The multiple first tabs 24 can be directly connected to the first output terminal 11, or the multiple first tabs 24 can be indirectly connected to the first output terminal 11 through the current collector.

[0120] The electrode assembly 20 includes a plurality of first tabs 24 arranged at intervals along the winding direction X3. The plurality of first tabs 24 are stacked and electrically connected, which helps to improve the overcurrent capacity of the battery cell 100.

[0121] In embodiments where the electrode assembly 20 has a wound structure, there may be one first auxiliary electrode tab 26, or there may be multiple first auxiliary electrode tabs 26. For example... Figure 12 As shown, in an embodiment where there are multiple first auxiliary electrodes 26, the multiple first auxiliary electrodes 26 are arranged at intervals along the winding direction X3, and the multiple first auxiliary electrodes 26 are stacked and electrically connected.

[0122] Specifically, multiple first auxiliary electrodes 26 are connected at intervals along the winding direction X3 to one end of the first current collector 211. The multiple first auxiliary electrodes 26 are stacked and electrically connected. After being stacked, the multiple first auxiliary electrodes 26 can be electrically connected by means of conductive adhesive, welding, or other methods. The multiple first auxiliary electrodes 26 can be directly connected to the first acquisition terminal 13, or they can be indirectly connected to the first acquisition terminal 13 through current collector components.

[0123] The wound electrode assembly 20 includes a plurality of first auxiliary tabs 26 arranged at intervals along the winding direction X3. The plurality of first auxiliary tabs 26 are stacked and electrically connected, which facilitates the manufacturing and shaping of the electrode assembly 20. The stacked and connected first auxiliary tabs 26 have better strength, reduce the risk of breakage of the first auxiliary tabs 26, and help improve the reliability of electrode data acquisition.

[0124] In an embodiment where the electrode assembly 20 has a stacked structure, the electrode assembly 20 includes a plurality of first electrode plates 21 stacked together, each first electrode plate 21 being connected to at least one of a first electrode tab 24 and a first auxiliary electrode tab 26. Wherein, as Figure 2 , Figure 5 As shown, each first electrode 21 can be provided with a first electrode tab 24 and a first auxiliary electrode tab 26; as Figure 13As shown, some of the first electrode pieces 21 can be connected to the first electrode tab 24 but not to the first auxiliary electrode tab 26, while other parts of the first electrode pieces 21 can be connected to the first auxiliary electrode tab 26 but not to the first electrode tab 24. In this embodiment, multiple first electrode pieces 21 can be electrically connected through the first auxiliary electrode tab 26.

[0125] In an embodiment where the electrode assembly 20 has a stacked structure, there are multiple first tabs 24, and the first electrode 21 is connected to at most one first tab 24. The multiple first tabs 24 are stacked and electrically connected.

[0126] like Figure 2 , Figure 5 As shown, each of the multiple first pole pieces 21 can be connected to a first pole tab 24. For example... Figure 13 As shown, among the multiple first pole pieces 21, only a portion of the first pole pieces 21 may be connected to the first electrode tab 24, while the other portion of the first pole pieces 21 may be connected to the first auxiliary electrode tab 26.

[0127] After the multiple first tabs 24 of the stacked electrode assembly 20 are stacked, they can be electrically connected by means of conductive adhesive, welding or other methods. The multiple first tabs 24 can be directly connected to the first output terminal 11, or they can be indirectly connected to the first output terminal 11 through a current collector.

[0128] The electrode assembly 20 includes a plurality of first tabs 24, which are stacked and electrically connected, which helps to improve the overcurrent capacity of the battery cell 100.

[0129] In an embodiment where the electrode assembly 20 has a stacked structure, there are multiple first auxiliary tabs 26, and the first auxiliary electrode is connected to at most one first auxiliary tab 26. The multiple first auxiliary tabs 26 are stacked and electrically connected.

[0130] like Figure 2 , Figure 5 As shown, each of the multiple first pole pieces 21 can be connected to a first auxiliary pole piece 26. For example... Figure 13 As shown, among the multiple first pole pieces 21, only a portion of the first pole pieces 21 may be connected to the first auxiliary electrode tab 26, while the other portion of the first pole pieces 21 may be connected to the first electrode tab 24.

[0131] Multiple first auxiliary electrodes 26 can be stacked and electrically connected by means of conductive adhesive, welding, or other methods. Multiple first auxiliary electrodes 26 can be directly connected to the first acquisition terminal 13, or they can be indirectly connected to the first acquisition terminal 13 through current collectors.

[0132] The electrode assembly 20 includes multiple first auxiliary electrodes 26. The strength of the multiple first auxiliary electrodes 26 after being stacked and connected is better, reducing the risk of breakage of the first auxiliary electrodes 26 and improving the reliability of information acquisition of the first electrode 21.

[0133] like Figure 14 As shown, in some embodiments, the end of the first electrode 24 connected to the first current collector 211 is the first end 241, and the end of the first auxiliary electrode 26 connected to the first current collector 211 is the second end 261. The width of the first end 241 is W1 along the width direction of the first electrode 24, and the width of the second end 261 is W2 along the width direction of the first auxiliary electrode 26, where 2≤W1 / W2≤10.

[0134] For example, W1 / W2 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., and any value within a range consisting of any two of these values.

[0135] In an embodiment where the electrode assembly 20 is a wound structure, in the unfolded state of the first electrode 21, the arrangement direction of the plurality of first electrode tabs 24 is the length direction of the first electrode 21, and the length direction of the first electrode 21 in the unfolded state corresponds to the winding direction X3 of the first electrode 21 in the wound state.

[0136] By ensuring that W1 / W2 is greater than or equal to 2, the width of the second end 261 of the first auxiliary electrode 26 is not too large compared to the width of the first end 241 of the first electrode 24, thus reducing the space occupied by the first auxiliary electrode 26 and reducing the energy density loss of the cell 100 caused by the first auxiliary electrode 26. By ensuring that W1 / W2 is less than or equal to 10, the width of the second end 261 of the first auxiliary electrode 26 is not too small compared to the width of the first end 241 of the first electrode 24, which facilitates the manufacturing of the first electrode 24 and the first auxiliary electrode 26 and reduces the manufacturing difficulty. Therefore, 2≤W1 / W2≤10 is beneficial to reducing the manufacturing difficulty of the cell 100 and enabling the cell 100 to have better energy density.

[0137] In some embodiments, 2≤W1 / W2≤6.

[0138] For example, W1 / W2 can be 2, 2.2, 2.5, 2.8, 3.2, 3.5, 3.8, 4.2, 4.5, 4.8, 5.2, 5.5, 5.8, 6, etc., and any value within a range consisting of any two of these values.

[0139] By ensuring that W1 / W2 is greater than or equal to 2, the width of the second end 261 of the first auxiliary electrode 26 is not too large compared to the width of the first end 241 of the first electrode 24, thus reducing the space occupied by the first auxiliary electrode 26 and reducing the energy density loss of the cell 100 caused by the first auxiliary electrode 26. By ensuring that W1 / W2 is less than or equal to 6, the width of the second end 261 of the first auxiliary electrode 26 is not too small compared to the width of the first end 241 of the first electrode 24, which facilitates the manufacturing of the first electrode 24 and the first auxiliary electrode 26 and further reduces the manufacturing difficulty. Therefore, 2≤W1 / W2≤6 is beneficial to further reduce the manufacturing difficulty of the cell 100 and enable the cell 100 to have better energy density.

[0140] like Figures 1-8 As shown, in some embodiments, the housing 10 is provided with a second acquisition terminal 15; the electrode assembly 20 also includes a second auxiliary electrode tab 27, the second auxiliary electrode tab 27 is connected to the second electrode plate 22, the second electrode tab 25 is electrically connected to the second output terminal 12, and the second auxiliary electrode tab 27 is electrically connected to the second acquisition terminal 15.

[0141] In an embodiment where the battery cell 100 is a hard-shell battery cell, the housing 10 may be insulated with a fifth terminal 10k, which is electrically connected to the second auxiliary electrode 27. The fifth terminal 10k serves as the second acquisition terminal 15.

[0142] In embodiments where cell 100 is a pouch cell, cell 100 further includes a fifth conductive element 10h, such as... Figure 4 and Figure 6 As shown, a portion of the fifth conductive element 10h is electrically connected to the second auxiliary electrode 27 within the housing 10, and another portion of the fifth conductive element 10h extends out of the housing 10 as the second acquisition terminal 15.

[0143] like Figure 9As shown, during the data acquisition process of the battery cell 100, the two connection terminals of the data acquisition instrument 200 can be connected to the second acquisition terminal 15 and the reference acquisition terminal 14 respectively, so that the data acquisition instrument 200 can acquire the data of the second electrode 22. The data acquisition instrument 200 can be a current and voltage multiplexer to acquire the potential and current data of the second electrode 22. The data acquisition instrument 200 can also be an electrochemical resistance tester to acquire the impedance data of the second electrode 22. During the test, the reference signal of the reference electrode 30 is known, and the corresponding data of the second electrode 22 is obtained by subtracting the reference signal of the reference electrode 30 from the data acquired by the data acquisition instrument 200. For example, if it is necessary to collect the potential data of the second electrode 22, the potential of the second electrode 22 is obtained by subtracting the potential value of the reference electrode 30 from the potential data collected by the data acquisition instrument 200; if it is necessary to collect the current data of the second electrode 22, the current of the second electrode 22 is obtained by subtracting the current value of the reference electrode 30 from the current data collected by the data acquisition instrument 200; if it is necessary to collect the impedance data of the second electrode 22, the impedance of the second electrode 22 is obtained by subtracting the impedance value of the reference electrode 30 from the impedance data collected by the data acquisition instrument 200.

[0144] By connecting the second electrode tab 25 and the second auxiliary electrode tab 27 to the second electrode 22, connecting the second electrode tab 25 to the second output terminal 12, connecting the second auxiliary electrode tab 27 to the second acquisition terminal 15, and connecting the reference electrode 30 to the reference acquisition terminal 14, the potential, current, impedance, and other information of the second electrode 22 can be collected by the acquisition instrument 200 connected to the second acquisition terminal 15 and the reference acquisition terminal 14. This accurately reflects the information of the second electrode 22. Since the second auxiliary electrode tab 27 does not participate in the input and output of electrical energy of the battery cell 100, the potential, current, impedance, and other data of the second electrode 22 can be collected in real time when the battery cell 100 is working. This eliminates the interference of the first electrode 21 on the data collection of the second electrode 22, improves the authenticity of the data source, and provides timely warning of potential safety hazards of the battery cell 100, thereby improving the safety performance of the battery cell 100.

[0145] like Figures 1-10 As shown, in some embodiments, the second tab 25 and the second auxiliary tab 27 are located on different sides of the electrode assembly 20, which can reduce the risk of interference between the second tab 25 and the second auxiliary tab 27, thereby reducing the risk of interference between the two circuits of the cell 100's input and output electrical energy and electrode data acquisition, thus improving the reliability and safety of the cell 100's charging and discharging, and enhancing the accuracy of electrode data acquisition. For example, if the second tab 25 and the second auxiliary tab 27 are respectively connected to opposite ends of the second electrode 22 along the first direction X1, then the second tab 25 and the second auxiliary tab 27 are located on opposite sides of the electrode assembly 20 along the first direction X1.

[0146] In other embodiments, the second tab 25 and the second auxiliary tab 27 may be located on the same side of the electrode assembly 20, which facilitates the manufacturing and shaping of the second tab 25 and the second auxiliary tab 27.

[0147] Combined with reference Figure 4 , Figure 10 As shown, in some embodiments, the second output terminal 12 and the second acquisition terminal 15 are located at opposite ends of the housing 10 along the first direction X1, and the second electrode tab 25 and the second auxiliary electrode tab 27 are connected to opposite ends of the second electrode plate 22 along the first direction X1.

[0148] The second electrode 25 is connected to the end of the second electrode 22 near the second output terminal 12, and the second auxiliary electrode 27 is connected to the end of the second electrode 22 near the second acquisition terminal 15.

[0149] The second output terminal 12 and the second acquisition terminal 15 are located at opposite ends of the housing 10 along the first direction X1. The second tab 25 and the second auxiliary tab 27 are respectively connected to opposite ends of the second electrode 22 along the first direction X1. This facilitates the connection between the second output terminal 12 and the second tab 25, as well as the second acquisition terminal 15 and the second auxiliary tab 27. It also reduces the risk of interference between the second tab 25 and the second auxiliary tab 27, thereby reducing the risk of interference between the two circuits of the cell 100's input and output power and the electrode data acquisition. This improves the reliability and safety of the cell 100's charging and discharging, as well as the accuracy of the electrode data acquisition.

[0150] In embodiments where the electrode assembly 20 has a wound structure, there may be one second tab 25, or there may be multiple second tabs 25. For example... Figure 11 As shown, in embodiments where there are multiple second tabs 25, the multiple second tabs 25 are arranged at intervals along the winding direction X3 of the electrode assembly 20, and the multiple second tabs 25 are stacked and electrically connected. Specifically, the multiple second tabs 25 are connected at intervals along the winding direction X3 to one end of the second current collector 221. The multiple second tabs 25 are stacked and electrically connected. After the multiple second tabs 25 are stacked, they can be electrically connected by means of conductive adhesive, welding, etc. The multiple second tabs 25 can be directly connected to the second output terminal 12, or the multiple second tabs 25 can be indirectly connected to the second output terminal 12 through the current collector.

[0151] The electrode assembly 20 includes a plurality of second tabs 25 arranged at intervals along the winding direction X3. The plurality of second tabs 25 are stacked and electrically connected, which helps to improve the overcurrent capacity of the battery cell 100.

[0152] In embodiments where the electrode assembly 20 has a wound structure, there may be one second auxiliary electrode tab 27, or there may be multiple second auxiliary electrode tabs 27. For example... Figure 12As shown, in an embodiment where there are multiple second auxiliary electrodes 27, the multiple second auxiliary electrodes 27 are arranged at intervals along the winding direction X3, and the multiple second auxiliary electrodes 27 are stacked and electrically connected.

[0153] Specifically, multiple second auxiliary electrodes 27 are spaced apart along the winding direction X3 and connected to one end of the second current collector 221. The multiple second auxiliary electrodes 27 are stacked and electrically connected. After being stacked, the multiple second auxiliary electrodes 27 can be electrically connected by means of conductive adhesive, welding, or other methods. The multiple second auxiliary electrodes 27 can be directly connected to the second acquisition terminal 15, or they can be indirectly connected to the second acquisition terminal 15 through current collector components.

[0154] The electrode assembly 20 includes a plurality of second auxiliary tabs 27 arranged at intervals along the winding direction X3. The plurality of second auxiliary tabs 27 are stacked and electrically connected, which facilitates the manufacturing and forming of the electrode assembly 20. The stacked and connected second auxiliary tabs 27 have better strength, reduce the risk of breakage of the second auxiliary tabs 27, and help improve the reliability of data acquisition of the second electrode 22.

[0155] In an embodiment where the electrode assembly 20 has a stacked structure, the electrode assembly 20 includes a plurality of stacked second electrode plates 22, each second electrode plate 22 being connected to at least one of a second electrode tab 25 and a second auxiliary electrode tab 27. For example... Figure 3 , Figure 6 As shown, each second pole piece 22 can be provided with a second pole tab 25 and a second auxiliary pole tab 27; as Figure 15 As shown, some of the second electrode plates 22 can be connected to the second electrode tab 25 but not to the second auxiliary electrode tab 27, while other parts of the second electrode plates 22 can be connected to the second auxiliary electrode tab 27 but not to the second electrode tab 25. In this embodiment, multiple first electrode plates 21 can be electrically connected through the first auxiliary electrode tab 26.

[0156] In an embodiment where the electrode assembly 20 has a stacked structure, there are multiple second tabs 25, and the second electrode 22 is connected to at most one second tab 25. The multiple second tabs 25 are stacked and electrically connected.

[0157] like Figure 3 , Figure 6 As shown, each of the multiple second pole pieces 22 may be connected to a second pole tab 25. For example... Figure 15 As shown, among the multiple second pole pieces 22, only a portion of the second pole pieces 22 may be connected to the second pole tab 25, while the other portion of the second pole pieces 22 may be connected to the second auxiliary pole tab 27.

[0158] After the multiple second tabs 25 of the stacked electrode assembly 20 are stacked, they can be electrically connected by means of conductive adhesive, welding or other methods. The multiple second tabs 25 can be directly connected to the second output terminal 12, or they can be indirectly connected to the second output terminal 12 through a current collector.

[0159] The electrode assembly 20 includes a plurality of second tabs 25, which are stacked and electrically connected, which helps to improve the overcurrent capacity of the battery cell 100.

[0160] In an embodiment where the electrode assembly 20 has a stacked structure, there are multiple second auxiliary tabs 27, and the second auxiliary electrode is connected to at most one second auxiliary tab 27. The multiple second auxiliary tabs 27 are stacked and electrically connected.

[0161] like Figure 3 , Figure 6 As shown, each of the multiple second pole pieces 22 may be connected to a second auxiliary pole piece 27. For example... Figure 15 As shown, among the multiple second pole pieces 22, only a portion of the second pole pieces 22 may be connected to the second auxiliary pole tab 27, while the other portion of the second pole pieces 22 may be connected to the second pole tab 25.

[0162] Multiple second auxiliary electrodes 27 can be stacked and electrically connected by means of conductive adhesive, welding, or other methods. Multiple second auxiliary electrodes 27 can be directly connected to the second acquisition terminal 15, or they can be indirectly connected to the second acquisition terminal 15 through a current collector.

[0163] The electrode assembly 20 includes multiple second auxiliary electrodes 27. The multiple second auxiliary electrodes 27 are stacked and connected to form a stronger structure, which reduces the risk of breakage of the second auxiliary electrodes 27 and helps to improve the reliability of data acquisition by the second electrode 22.

[0164] Please continue to refer to Figure 10 In some embodiments, the first auxiliary tab 26 and the second auxiliary tab 27 are located on the same side of the electrode assembly 20, which helps to reduce the size of the electrode assembly 20, thereby helping to reduce the energy density loss of the cell 100 and enabling the cell 100 to have a higher energy density.

[0165] Of course, in other embodiments, the first auxiliary electrode 26 and the second auxiliary electrode 27 may also be located on different sides of the electrode assembly 20, so as to flexibly set the first acquisition terminal 13 and the second acquisition terminal 15.

[0166] like Figure 15As shown, in some embodiments, the end of the second electrode 25 connected to the second current collector 221 is the third end 251, and the end of the second auxiliary electrode 27 connected to the second current collector 221 is the fourth end 271. The width of the third end 251 is W3 along the width direction of the second electrode 25, and the width of the fourth end 271 is W4 along the width direction of the second auxiliary electrode 27, where 2≤W3 / W4≤10.

[0167] For example, W3 / W4 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., as well as a range of any two values ​​therein and any value within that range.

[0168] In an embodiment where the electrode assembly 20 is a wound structure, in the unfolded state of the second electrode 22, the arrangement direction of the plurality of second electrode tabs 25 is the length direction of the second electrode 22, and the length direction of the second electrode 22 in the unfolded state corresponds to the winding direction X3 of the second electrode 22 in the wound state.

[0169] By ensuring that W3 / W4 is greater than or equal to 2, the width of the fourth end 271 of the second auxiliary electrode 27 is not too large compared to the width of the third end 251 of the second electrode 25, thus reducing the space occupied by the second auxiliary electrode 27 and reducing the energy density loss of the cell 100 caused by the installation of the second auxiliary electrode 27. By ensuring that W3 / W4 is less than or equal to 10, the width of the fourth end 271 of the second auxiliary electrode 27 is not too small compared to the width of the third end 251 of the second electrode 25, which facilitates the manufacturing of the second electrode 25 and the second auxiliary electrode 27 and reduces the manufacturing difficulty. Therefore, 2≤W3 / W4≤10 is beneficial to reducing the manufacturing difficulty of the cell 100 and enabling the cell 100 to have better energy density.

[0170] In some embodiments, 2≤W3 / W4≤6.

[0171] For example, W3 / W4 can be 2, 2.2, 2.5, 2.8, 3.2, 3.5, 3.8, 4.2, 4.5, 4.8, 5.2, 5.5, 5.8, 6, etc., as well as a range of any two values ​​therein and any value within that range.

[0172] By ensuring that W3 / W4 is greater than or equal to 2, the width of the fourth end 271 of the second auxiliary electrode 27 is not too large compared to the width of the third end 251 of the second electrode 25, thus reducing the space occupied by the second auxiliary electrode 27 and reducing the energy density loss of the cell 100 caused by the installation of the second auxiliary electrode 27. By ensuring that W3 / W4 is less than or equal to 6, the width of the fourth end 271 of the second auxiliary electrode 27 is not too small compared to the width of the third end 251 of the second electrode 25, which facilitates the manufacturing of the second electrode 25 and the second auxiliary electrode 27 and further reduces the manufacturing difficulty. Therefore, 2≤W3 / W4≤6 is beneficial to further reduce the manufacturing difficulty of the cell 100 and enable the cell 100 to have better energy density.

[0173] like Figures 17-20 As shown, in some embodiments, the reference electrode 30 includes at least one reference electrode 31 disposed between the first electrode 21 and the second electrode 22.

[0174] like Figure 18 , Figure 20 As shown, the reference electrode 31 includes a reference current collector 311, a first insulating layer 312, and a signal acquisition layer 313. Along the thickness direction of the reference current collector 311, the reference current collector 311 has a first surface 3111 facing the isolation film 23 and a second surface 3112 facing away from the isolation film 23. The signal acquisition layer 313 is disposed on the first surface 3111, and the first insulating layer 312 is disposed on the second surface 3112. The reference current collector 311 is electrically connected to the reference acquisition terminal 14.

[0175] The reference current collector 311 is made of a conductive material, such as copper or aluminum.

[0176] The signal acquisition layer 313 is the region in the reference electrode 30 that can form a fixed reference signal. The signal acquisition layer 313 is electrically connected to the reference current collector 311.

[0177] The reference current collector 311 includes a first region 311a and a second region 311b. The signal acquisition layer 313 and the first insulating layer 312 are disposed in the first region 311a. When viewed in the thickness direction of the reference current collector 311, neither the signal acquisition layer 313 nor the first insulating layer 312 overlaps with the second region 311b.

[0178] In some embodiments, the second region 311b of the reference current collector 311, the first auxiliary electrode tab 26, and the second auxiliary electrode tab 27 are located on the same side of the electrode assembly 20. The reference acquisition terminal 14, the first acquisition terminal 13, and the second acquisition terminal 15 are disposed on the side of the housing 10 near the second region 311b, the first auxiliary electrode tab 26, and the second auxiliary electrode tab 27, so that the reference electrode 30, the first auxiliary electrode tab 26, and the second auxiliary electrode tab 27 can be connected to the reference acquisition terminal 14, the first acquisition terminal 13, and the second acquisition terminal 15, respectively.

[0179] The signal acquisition layer 313 can be a coating material disposed on the first surface 3111, that is, the signal acquisition layer 313 can be disposed on the first surface 3111 by coating. The signal acquisition layer 313 can also be a solid structure bonded to the first surface 3111, such as a thin film or foil.

[0180] The signal acquisition layer 313 can cover the entire area of ​​the first surface 3111 located in the first region 311a, or it can only cover a part of the area of ​​the first surface 3111 located in the first region 311a.

[0181] The first insulating layer 312 can be an insulating coating disposed on the second surface 3112, that is, the signal acquisition layer 313 can be an insulating layer disposed on the first surface 3111 by coating. The first insulating layer 312 can also be an insulating layer bonded to the first surface 3111, such as insulating tape, insulating film, etc. The second insulating layer disposed on the second surface 3112 can cover the entire second surface 3112 located in the first region 311a.

[0182] By placing the signal acquisition layer 313 on the first surface 3111 of the reference current collector 311 facing the isolation film 23, the isolation film 23 can insulate and separate the signal acquisition layer 313 and the electrode, reducing the risk of reference signals provided by the electrode interference signal acquisition layer 313 and improving the accuracy of data acquisition from the electrode. A first insulating layer 312 is provided on the second surface 3112 of the reference current collector 311 facing away from the isolation film 23. The first insulating layer 312 can insulate and separate the reference current collector 311 and the electrode, reducing the risk of reference signals from the electrode interference signal acquisition layer 313 and improving the accuracy of data acquisition from the electrode.

[0183] like Figure 18 As shown, in some embodiments, only the second surface 3112 may be provided with the first insulating layer 312.

[0184] like Figure 20As shown, in some other embodiments, the first surface 3111 and the second surface 3112 may both be provided with the first insulating layer 312. Then, a part of the first surface 3111 is covered by the first insulating layer 312, and a part of the first surface 3111 is covered by the signal acquisition layer 313. The size of the signal acquisition layer 313 is not too large, which helps to reduce the manufacturing cost of the reference electrode 31.

[0185] The first insulating layer 312 and the signal acquisition layer 313 disposed on the first surface 3111 can be arranged side by side. That is, when viewed along the thickness direction of the reference acquisition layer, the projection of the first insulating layer 312 disposed on the first surface 3111 and the projection of the signal acquisition layer 313 do not overlap. When the first insulating layer 312 and the signal acquisition layer 313 are arranged side by side, the signal acquisition layer 313 can be completely electrically connected to the reference current collector 311, which is beneficial for acquiring data from the electrode.

[0186] Of course, the first insulating layer 312 and the signal acquisition layer 313 disposed on the first surface 3111 may also have an overlapping area, that is, a part of the first insulating layer 312 disposed on the first surface 3111 and a part of the signal acquisition layer 313 overlap to form an overlapping portion. In the overlapping portion, the first insulating layer 312 is disposed on the surface of the signal acquisition layer 313 away from the reference current collector 311, or the signal acquisition layer 313 is disposed on the surface of the first insulating layer 312 away from the reference current collector 311.

[0187] In an embodiment where the electrode assembly 20 has a wound structure, the first insulating layer 312 and the signal acquisition layer 313 disposed on the first surface 3111 are arranged along the winding axis direction X2 of the electrode assembly 20, which facilitates the connection between the reference electrode 31 and the reference acquisition terminal 14, and also helps the signal acquisition layer 313 to form an overlapping area with the active material layer of the electrode, thereby realizing effective data acquisition from the electrode.

[0188] In some embodiments, the first insulating member and the signal acquisition layer 313 disposed on the first surface 3111 are arranged in the length direction of the reference current collector 311. In the width direction of the reference current collector 311, the width of the signal acquisition layer 313, the width of the reference current collector 311, and the width of the first insulating layer 312 are the same. In the width direction of the reference current collector 311, the two opposite end faces of the signal acquisition layer 313 are flush with the two opposite end faces of the reference current collector 311, and the two opposite end faces of the first insulating layer 312 are also flush with the two opposite end faces of the reference current collector 311.

[0189] In some embodiments, along the winding direction X3 of the electrode assembly 20, the width of the end of the first auxiliary tab 26 connected to the first current collector 211 is the same as the width of the signal acquisition layer 313.

[0190] The winding direction X3 of the electrode assembly 20 is the width direction of the first auxiliary electrode tab 26, that is, the width of the second end 261 is the same as the width of the signal acquisition layer 313. (Refer to reference...) Figure 14 , Figure 21 Along the winding direction X3, the width of the signal acquisition layer 313 is W5, then W5 = W2.

[0191] By using the winding direction X3 of the electrode assembly 20, the width of the end of the first auxiliary electrode tab 26 connected to the first current collector 211 is the same as the width of the signal acquisition layer 313, which facilitates the manufacturing and shaping of the reference electrode 31.

[0192] like Figure 16 , Figure 18 As shown, in some embodiments, along the winding axis X2 of the electrode assembly 20, the size of the first electrode 21 is L1, and the size of the signal acquisition layer 313 is L. 11 2.5≤L1 / L 11 ≤10.

[0193] L1 is the maximum dimension of the first electrode 21 along the winding axis X2 of the electrode assembly 20. 11 The maximum dimension of the signal acquisition layer 313 along the winding axis direction X2 of the electrode assembly 20.

[0194] For example, L1 / L 11 It can be 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, etc., as well as any range of any two values ​​and any value within that range.

[0195] Through L1 / L 11 A value greater than or equal to 2.5 is beneficial for the formation of an overlapping area between the signal acquisition layer 313 and the active material layer of the first electrode 21, facilitating effective data acquisition from the first electrode 21; through L1 / L 11 A value less than or equal to 10 ensures that the size of the signal acquisition layer 313 in the winding axis direction X2 is not too large, which helps to reduce the space occupied by the signal acquisition layer 313 and the energy density loss of the battery cell 100 due to the setting of the reference electrode 30. Therefore, 2.5 ≤ L1 / L 11 ≤10, which facilitates effective data collection from the electrode plates and enables cell 100 to have a high energy density.

[0196] In some embodiments, 3 ≤ L1 / L 11 ≤5.

[0197] For example, L1 / L 11It can be 3, 3.1, 3.2, 3.3, 3.4, 3.6, 3.7, 3.8, 3.9, 4.1, 4.2, 4.3, 4.4, 4.6, 4.7, 4.8, 4.9, 5, etc., as well as any range of any two values ​​and any value within that range.

[0198] Through L1 / L 11 A value greater than or equal to 3 facilitates the formation of an overlapping area between the signal acquisition layer 313 and the active material layer of the first electrode 21, thus enabling effective data acquisition from the first electrode 21; through L1 / L 11 A value less than or equal to 5 ensures that the size of the signal acquisition layer 313 in the winding axis direction X2 is not too large, which helps to further reduce the space occupied by the signal acquisition layer 313 and further reduce the energy density loss of the battery cell 100 due to the setting of the reference electrode 30. Therefore, 3 ≤ L1 / L 11 ≤5, which facilitates effective acquisition of signals from the electrode plates and enables cell 100 to have higher energy density.

[0199] like Figure 18 , Figure 20 As shown, in some embodiments, the thickness of the signal acquisition layer 313 is h1, where 0.5μm≤h1≤10μm.

[0200] The thickness of the signal acquisition layer 313 is the distance between two opposite surfaces of the signal acquisition layer 313 in the thickness direction of the reference current collector 311 (the arrangement direction of the first surface 3111 and the second surface 3112). The signal acquisition layer 313 can be a structure of uniform thickness or a structure of non-uniform thickness. h1 is merely a symbol representing the thickness of the signal acquisition layer 313 and does not imply that the signal acquisition layer 313 is a structure of uniform thickness. Understandably, the thickness of the signal acquisition layer 313 at any location satisfies 0.5μm-10μm.

[0201] For example, h1 can be 0.5μm, 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, 5μm, 5.5μm, 6μm, 6.5μm, 7μm, 7.5μm, 8μm, 8.5μm, 9μm, 9.5μm, 10μm, etc., as well as any range of any two values ​​therein and any value within that range.

[0202] A thickness of h1 greater than or equal to 0.5 μm facilitates data acquisition from the electrode. A thickness of h1 less than or equal to 10 μm prevents the signal acquisition layer 313 from becoming too thick, reducing the space occupied by the signal acquisition layer 313. This helps reduce energy density loss in the cell 100 caused by the reference electrode 30. Furthermore, a thickness of 313 that is not too thick also reduces the thickness difference between different areas of the electrode assembly 20, lowering the risk of electrode breakage due to excessive thickness differences in the electrode assembly 20 and improving the safety performance of the cell 100. Therefore, 0.5 μm ≤ h1 ≤ 10 μm facilitates effective acquisition of electrode signals and enables the cell 100 to possess high energy density and safety performance.

[0203] In some embodiments, 1μm≤h1≤3μm.

[0204] For example, h1 can be 1.1μm, 1.2μm, 1.3μm, 1.4μm, 1.6μm, 1.7μm, 1.8μm, 1.9μm, 2.1μm, 2.2μm, 2.3μm, 2.4μm, 2.6μm, 2.7μm, 2.8μm, 2.9μm, 3μm, etc., as well as a range of any two values ​​therein and any value within that range.

[0205] A thickness of h1 greater than or equal to 1 μm facilitates the acquisition of electrode signals. A thickness of h1 less than or equal to 3 μm reduces the thickness of the signal acquisition layer 313, further minimizing the space occupied by the signal acquisition layer 313. This helps to further reduce the energy density loss of the cell 100 caused by the reference electrode 30, and also prevents the thickness of the signal acquisition layer 313 from being too large. It also reduces the thickness difference between different areas of the electrode assembly 20, lowering the risk of electrode breakage due to excessive thickness difference in the electrode assembly 20, and improving the safety performance of the cell 100. Therefore, 1 μm ≤ h1 ≤ 3 μm facilitates the effective acquisition of electrode signals and enables the cell 100 to have higher energy density and safety performance.

[0206] In some embodiments, the material of the signal acquisition layer 313 includes at least one of lithium titanate, titanium dioxide, molybdenum disulfide, and tin oxide.

[0207] The material of the signal acquisition layer 313 may include only one of lithium titanate, titanium dioxide, molybdenum disulfide, and tin oxide. Alternatively, the material of the signal acquisition layer 313 may include at least two of lithium titanate, titanium dioxide, molybdenum disulfide, and tin oxide.

[0208] Lithium titanate exhibits good structural stability during lithium-ion insertion and extraction, meaning it maintains a stable potential during cycling, a crucial characteristic for reference electrode 30. Furthermore, lithium titanate shows minimal volume change during lithium-ion insertion and extraction, ensuring its stability during long-term cycling. The electrochemical reaction of lithium titanate occurs at approximately 1.5V vs. Li / Li. + Within a certain voltage range, this voltage window is relatively wide, making it suitable for various electrochemical systems.

[0209] Titanium dioxide is chemically stable and does not readily react with other substances, which allows it to remain stable in various electrolyte solutions. Titanium dioxide also possesses a high dielectric constant and semiconductor properties, enabling it to provide a stable potential in electrochemical measurements, a crucial characteristic for its use as a reference electrode 30.

[0210] Molybdenum disulfide exhibits good electrical conductivity, which helps improve the sensitivity and accuracy of electrochemical measurements. Its excellent lubrication properties reduce friction between the signal acquisition layer 313 and the electrolyte, potentially extending electrode lifespan. Furthermore, molybdenum disulfide demonstrates good stability in many chemical environments, making it suitable as a reference electrode 30 in a variety of electrolyte solutions.

[0211] Tin oxide has high electrical conductivity, which helps improve the efficiency and accuracy of electrochemical measurements. Tin oxide also exhibits stable electrochemical properties, displaying a stable potential in electrochemical reactions, making it suitable for use as a reference electrode 30.

[0212] Therefore, the material of the signal acquisition layer 313 includes at least one of lithium titanate, titanium dioxide, molybdenum disulfide, and tin oxide, which is beneficial for effective and accurate detection of electrode data.

[0213] like Figure 18 , Figure 20 As shown, in some embodiments, the thickness of the first insulating layer 312 is h2, where 1μm≤h2≤10μm.

[0214] The thickness of the first insulating layer 312 is the distance between two opposite surfaces of the first insulating layer 312 in the thickness direction of the reference current collector 311 (the arrangement direction of the first surface 3111 and the second surface 3112). The first insulating layer 312 can be a structure of uniform thickness or a structure of non-uniform thickness. h2 is merely a symbol representing the thickness of the first insulating layer 312 and does not imply that the first insulating layer 312 is a structure of uniform thickness. Understandably, the thickness of the first insulating layer 312 at any position satisfies 1μm-10μm.

[0215] For example, h2 can be 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, 5μm, 5.5μm, 6μm, 6.5μm, 7μm, 7.5μm, 8μm, 8.5μm, 9μm, 9.5μm, 10μm, etc., as well as any range of any two values ​​therein and any value within that range.

[0216] By ensuring h2 is greater than or equal to 1 μm, the thickness of the first insulating layer 312 is increased, resulting in better insulation performance. This reduces the risk to the reference signal of the electrode interference signal acquisition layer 313 and improves the accuracy of electrode data acquisition. By ensuring h2 is less than or equal to 10 μm, the thickness of the first insulating layer 312 is prevented from being too large, reducing the space occupied by the first insulating layer 312. This helps to reduce the energy density loss of the cell 100 caused by the setting of the reference electrode 30. Furthermore, the thickness of the first insulating layer 312 is not too large, which also reduces the thickness difference between different areas of the electrode assembly 20, reducing the risk of electrode breakage due to excessive thickness difference in the electrode assembly 20 and improving the safety performance of the cell 100. Therefore, 1 μm ≤ h2 ≤ 10 μm is beneficial to improving the accuracy of electrode data acquisition and enabling the cell 100 to have higher energy density and safety performance.

[0217] In some embodiments, 3μm≤h2≤5μm.

[0218] For example, h2 can be 3μm, 3.1μm, 3.2μm, 3.3μm, 3.4μm, 3.6μm, 3.7μm, 3.8μm, 3.9μm, 4.1μm, 4.2μm, 4.3μm, 4.4μm, 4.6μm, 4.7μm, 4.8μm, 4.9μm, 5μm, etc., as well as any range of any two values ​​therein and any value within that range.

[0219] By making h2 greater than or equal to 3μm, the thickness of the first insulating layer 312 is increased, resulting in better insulation performance. This further reduces the risk to the reference signal of the electrode interference signal acquisition layer 313, thereby improving the accuracy of electrode signal acquisition. By making h2 less than or equal to 5μm, the thickness of the first insulating layer 312 is reduced, further decreasing the space occupied by the first insulating layer 312. This helps to further reduce the energy density loss of the cell 100 caused by the reference electrode 30. Furthermore, the thickness of the first insulating layer 312 is not too large, which can further reduce the thickness difference between different areas of the electrode assembly 20. This further reduces the risk of electrode breakage due to excessive thickness difference in the electrode assembly 20, improving the safety performance of the cell 100. Therefore, 3μm≤h2≤5μm is beneficial to further improve the accuracy of electrode data acquisition and enable the cell 100 to have higher energy density and safety performance.

[0220] In some embodiments, the material of the first insulating layer 312 includes at least one of polyurethane, polyimide, polyethylene terephthalate, and epoxy resin.

[0221] The material of the first insulating layer 312 may include only one of polyurethane, polyimide, polyethylene terephthalate, and epoxy resin. The material of the first insulating layer 312 may include at least two of polyurethane, polyimide, polyethylene terephthalate, and epoxy resin.

[0222] The first insulating layer 312 is made of at least one of polyurethane, polyimide, polyethylene terephthalate, and epoxy resin, which gives the first insulating layer 312 good insulation performance and a long service life.

[0223] like Figure 18 , Figure 20 As shown, in some embodiments, the thickness of the reference current collector 311 is h3, where 1μm≤h3≤7μm.

[0224] The thickness of the reference current collector 311 is the distance between the first surface 3111 and the second surface 3112. The reference current collector 311 can be a structure of uniform thickness. For example, h3 can be 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, 5μm, 5.5μm, 6μm, 6.5μm, 7μm, etc., as well as any range of any two values ​​therein and any value within that range.

[0225] By ensuring h3 is greater than or equal to 1 μm, the thickness of the reference current collector 311 is increased, resulting in better strength and improved mechanical properties of the reference electrode 31. It also ensures good conductivity, facilitating effective signal acquisition from the electrode. Conversely, by ensuring h3 is less than or equal to 7 μm, the thickness of the reference current collector 311 is kept from becoming excessive, reducing its space requirements and minimizing energy density loss in the cell 100 due to the reference electrode 30. Furthermore, the reduced thickness of the reference current collector 311 also minimizes thickness differences between regions of the electrode assembly 20, lowering the risk of electrode breakage due to excessive thickness variations and improving the safety of the cell 100. Therefore, 1 μm ≤ h3 ≤ 7 μm contributes to improved accuracy in electrode signal acquisition and results in higher energy density and safety performance for the cell 100.

[0226] In some embodiments, 3.5μm≤h3≤4.5μm.

[0227] For example, h3 can be 3.5μm, 3.55μm, 3.6μm, 3.65μm, 3.7μm, 3.75μm, 3.8μm, 3.85μm, 3.9μm, 3.95μm, 4.1μm, 4.15μm, 4.2μm, 4.25μm, 4.3μm, 4.35μm, 4.4μm, 4.45μm, 4.5μm, etc., as well as any range of any two values ​​therein and any value within that range.

[0228] By ensuring h3 is greater than or equal to 3.5 μm, the thickness of the reference current collector 311 is increased, resulting in better strength and improved mechanical properties of the reference electrode 31. It also enhances conductivity, facilitating effective signal acquisition from the electrode. Conversely, by ensuring h3 is less than or equal to 4.5 μm, the thickness of the reference current collector 311 is reduced, minimizing its space requirements. This helps reduce energy density loss in the cell 100 due to the reference electrode 30, while preventing excessive thickness. Furthermore, it reduces the thickness difference between regions of the electrode assembly 20, lowering the risk of electrode breakage due to excessive thickness differences and improving the safety of the cell 100. Therefore, 3.5 μm ≤ h3 ≤ 4.5 μm further improves the accuracy of electrode data acquisition and enhances the energy density and safety of the cell 100.

[0229] The reference electrode 30 may include a reference electrode 31, that is, the reference electrode 31 is the reference electrode 30.

[0230] like Figure 17 , Figure 18 As shown, the reference electrode 30 may also include multiple reference electrodes 31. The multiple reference electrodes 31 are stacked. The reference current collectors 311 of the multiple reference electrodes 31 are stacked and electrically connected to form a connection part Q, and the reference acquisition terminal 14 is connected to the connection part Q.

[0231] Specifically, the second regions 311b of the reference current collectors 311 of each reference electrode 31 are stacked and electrically connected. The second regions 311b of each reference electrode 31 can be connected by welding, conductive adhesive, etc. The reference acquisition terminal 14 and the connecting part Q can be connected by welding, conductive adhesive, etc.

[0232] The reference electrode 30 includes multiple reference electrodes 31. The reference current collectors 311 of the multiple reference electrodes 31 are stacked and electrically connected to form a connection part Q. The reference acquisition terminal 14 is connected to the connection part Q. The connection part Q has good strength, which facilitates connection with the acquisition terminal and can improve the stability of the connection between the acquisition terminal and the reference electrode 30.

[0233] In some embodiments, at least one first electrode 21 is disposed between two adjacent reference electrodes 31, or at least one second electrode 22 is disposed between two adjacent reference electrodes 31, or at least one first electrode 21 and at least one second electrode 22 are disposed between two adjacent reference electrodes 31.

[0234] In an embodiment where the electrode assembly 20 has a wound structure, a first electrode layer 21 is a part of a turn of the first electrode layer 21, and a second electrode layer 22 is a part of a turn of the second electrode layer 22.

[0235] In an embodiment where the electrode assembly 20 has a stacked structure, a first electrode 21 layer is a first electrode 21 layer, and a second electrode 22 layer is a second electrode 22 layer.

[0236] By providing at least one first electrode 21 and / or at least one second electrode 22 between two adjacent reference electrodes 31, it is beneficial to distribute the multiple reference electrodes 31 more evenly, alleviate the problem of excessive distance between the first electrode 21 and the second electrode 22 caused by the provision of reference electrodes 31, and alleviate the problem of reduced cycle performance of the cell 100 caused by the provision of reference electrodes 31, thereby improving the electrical performance of the cell 100.

[0237] This application also provides an electrical device, which includes the battery cell 100 provided in any of the above embodiments.

[0238] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art.

Claims

1. An electric cell, characterized by, The application relates to a battery, comprising: a shell provided with a first output terminal, a first collection terminal and a reference collection terminal; an electrode assembly and a reference electrode accommodated in the shell, the electrode assembly comprising a first pole piece, a first tab and a first auxiliary tab, the first tab and the first auxiliary tab being connected to the first pole piece, the first tab being electrically connected to the first output terminal, the first auxiliary tab being electrically connected to the first collection terminal, and the reference electrode being electrically connected to the reference collection terminal.

2. The electric cell of claim 1, wherein, The first tab and the first auxiliary tab are located on different sides of the electrode assembly.

3. The electric cell of claim 2, wherein, The first output terminal and the first collection terminal are respectively located at opposite ends of the shell along a first direction, and the first tab and the first auxiliary tab are respectively connected to opposite ends of the first pole piece along the first direction.

4. The electric cell of any one of claims 1-3, wherein, The first pole piece comprises a first current collector and a first active material layer, at least one side of the first current collector in a thickness direction is provided with the first active material layer, and the first tab and the first auxiliary tab are connected to the first current collector, one end of the first tab connected to the first current collector is a first end, one end of the first auxiliary tab connected to the first current collector is a second end, the width of the first end along the width direction of the first tab is W1, the width of the second end along the width direction of the first auxiliary tab is W2, and 2<=W1 / W2<=10; optionally, 2<=W1 / W2<=6.

5. The electric cell of any one of claims 1-4, wherein, The electrode assembly is in a winding structure. The first tab is a plurality of first tabs, the plurality of first tabs are arranged at intervals along the winding direction of the electrode assembly, the plurality of first tabs are arranged in layers and electrically connected, and / or the first auxiliary tab is a plurality of first auxiliary tabs, the plurality of first auxiliary tabs are arranged at intervals along the winding direction, the plurality of first auxiliary tabs are arranged in layers and electrically connected; or The electrode assembly comprises a plurality of first pole pieces arranged in layers, and at least one of the first tab and the first auxiliary tab is connected to the first pole piece. The first tab is a plurality of first tabs, and the first pole piece is connected to at most one first tab, the plurality of first tabs are arranged in layers and electrically connected, and / or the first auxiliary tab is a plurality of first auxiliary tabs, and the first pole piece is connected to at most one first auxiliary tab, the plurality of first auxiliary tabs are arranged in layers and electrically connected.

6. The electric cell of any one of claims 1-5, wherein, The shell is provided with a second output terminal and a second collection terminal. The electrode assembly comprises a second pole piece, a second tab and a second auxiliary tab, the second pole piece and the first pole piece are opposite in polarity, the second tab and the second auxiliary tab are connected to the second pole piece, the second tab is electrically connected to the second output terminal, and the second auxiliary tab is electrically connected to the second collection terminal.

7. The electric cell of claim 6, wherein, The second tab and the second auxiliary tab are located on different sides of the electrode assembly.

8. The electric cell of claim 7, wherein, The second output terminal and the second collection terminal are respectively located at opposite ends of the shell along a first direction, and the second tab and the second auxiliary tab are respectively connected to opposite ends of the second pole piece along the first direction.

9. The electric cell of any one of claims 6-8, wherein, The second tab includes a second current collector and a second active material layer, at least one side of the second current collector in the thickness direction is provided with the second active material layer, the second tab and the second auxiliary tab are connected to the second current collector, one end of the second tab connected to the second current collector is a third end, one end of the second auxiliary tab connected to the second current collector is a fourth end, along the width direction of the second tab, the width of the third end is W3, along the width direction of the second auxiliary tab, the width of the fourth end is W4, 2≤W3 / W4≤10; optionally, 2≤W3 / W4≤6.

10. The electric cell of any one of claims 6-9, wherein, The electrode assembly is a winding structure. The second tab is a plurality of second tabs, the plurality of second tabs are arranged at intervals along the winding direction of the electrode assembly, the plurality of second tabs are arranged in layers and electrically connected, and / or the second auxiliary tab is a plurality of second auxiliary tabs, the plurality of second auxiliary tabs are arranged at intervals along the winding direction, the plurality of second auxiliary tabs are arranged in layers and electrically connected; or, The electrode assembly includes a plurality of second tabs arranged in layers, and at least one of the second tab and the second auxiliary tab is connected to the second tab; The second tab is a plurality of second tabs, the second tab is connected to at most one second tab, and a plurality of second tabs are arranged in layers and electrically connected, and / or the second auxiliary tab is a plurality of second auxiliary tabs, the second tab is connected to at most one second auxiliary tab, and a plurality of second auxiliary tabs are arranged in layers and electrically connected.

11. The electric cell of any one of claims 6-10, wherein, The first auxiliary tab and the second auxiliary tab are located on the same side of the electrode assembly.

12. The electric cell of any one of claims 1-11, wherein, The electrode assembly further includes a second tab and a separation film, the second tab is opposite in polarity to the first tab, and the separation film insulates and separates the first tab and the second tab. The reference electrode includes at least one reference tab, the reference tab is arranged between the first tab and the second tab, the reference tab includes a reference current collector, a first insulating layer and a signal collection layer, along the thickness direction of the reference current collector, the reference current collector has a first surface facing the separation film and a second surface facing away from the separation film, the signal collection layer is arranged on the first surface, the second surface is provided with the first insulating layer, and the reference current collector is electrically connected to the reference collection terminal.

13. The electric cell of claim 12, wherein, The first surface is also provided with the first insulating layer, and the first insulating layer arranged on the first surface is arranged side by side with the signal collection layer.

14. The electric cell of claim 13, wherein, The electrode assembly is a winding structure, and the first insulating layer arranged on the first surface and the signal collection layer are arranged along the winding axis direction of the electrode assembly.

15. The electric cell of claim 14, wherein, The first tab includes a first current collector and a first active material layer, at least one side of the first current collector in the thickness direction is provided with the first active material layer, and the first tab and the first auxiliary tab are connected to the first current collector; Along the winding direction of the electrode assembly, the width of one end of the first auxiliary tab connected to the first current collector is the same as the width of the signal collection layer.

16. The electric cell according to claim 14 or 15, characterized in that, The size of the first electrode tab is L1, and the size of the signal acquisition layer is L along the winding axis direction of the electrode assembly 11 , 2.5≤L1 / L 11 ≤10; optionally, 3≤L1 / L 11 ≤5.

17. The electric cell of any one of claims 12-16, wherein, The thickness of the signal collection layer is h1, 0.5 μm≤h1≤10 μm; optionally, 1 μm≤h1≤3 μm; and / or The material of the signal collection layer comprises at least one of lithium titanate, titanium dioxide, molybdenum disulfide, and tin oxide.

18. The electric cell of any one of claims 12-17, wherein, The thickness of the first insulating layer is h2, 1 μm≤h2≤10 μm; optionally, 3 μm≤h2≤5 μm; and / or, the material of the first insulating layer comprises at least one of polyurethane, polyimide, polyethylene terephthalate, and epoxy resin.

19. The electric cell of any one of claims 12-18, wherein, The thickness of the reference current collector is h3, 1 μm≤h3≤7 μm; optionally, 3.5 μm≤h3≤4.5 μm.

20. The electric cell of any one of claims 12-19, wherein, The reference electrode comprises a plurality of the reference electrode pieces stacked and arranged, the reference current collector layers of the plurality of the reference electrode pieces are stacked and arranged and electrically connected to form a connecting portion, and the reference collection terminal is connected to the connecting portion.

21. The electrically charged cell of claim 20, wherein, At least one layer of the first electrode piece and / or at least one layer of the second electrode piece is arranged between two adjacent reference electrode pieces.

22. An electrical device, comprising: The battery cell according to any one of claims 1-21.

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