Single battery, battery module and electric device

Abstract

The application relates to a single battery, a battery module and a power utilization device, and relates to the technical field of batteries.The single battery comprises a first winding core and a second winding core.The first winding core comprises a first diaphragm, and the first diaphragm comprises a first base film and a first coating layer, wherein the first coating layer covers part of the first base film.The second winding core comprises a second diaphragm, and the second diaphragm comprises a second base film and a second coating layer, wherein the second coating layer covers part or all of the second base film.The covering parameter of the first coating layer to the first base film is different from the covering parameter of the second coating layer to the second base film.The first coating layer and the second coating layer are used for delaying the propagation of thermal runaway.The application differentiates the covering parameter of the first coating layer to the first base film and the covering parameter of the second coating layer to the second base film, so that the thermal runaway occurrence time of the first winding core and the second winding core can be pulled apart, the highest temperature in the single battery when thermal runaway occurs is reduced, and the safety and reliability of the single battery are improved.

Description

[0001] This application claims priority to Chinese Patent Application No. 2025215663152, filed on July 24, 2025, entitled "Single Battery Cell, Battery Module and Electrical Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a single cell, a battery module, and an electrical device. Background Technology

[0003] Lithium iron phosphate (LFP) batteries are widely used in energy storage due to their high thermal stability and safety. However, even LFP batteries can experience thermal runaway under certain conditions, caused by factors such as internal short circuits, external heating, overcharging, mechanical damage, or battery aging. Excessively high thermal runaway temperatures can lead to battery overheating, expansion, voltage fluctuations, gas emissions, and even, in extreme cases, explosion. Summary of the Invention

[0004] This application provides a single battery cell, a battery module, and an electrical device to at least partially solve the technical problems of battery overheating, expansion, voltage fluctuation, gas emission, and even explosion caused by excessively high battery thermal runaway temperature.

[0005] To achieve the above objectives, according to a first aspect of this application, this application provides a single-cell battery, comprising: The first core includes a first diaphragm, the first diaphragm includes a first base film and a first coating, wherein the first coating covers a portion of the first base film; The second core includes a second diaphragm, the second diaphragm includes a second base film and a second coating, wherein the second coating covers part or all of the second base film; The coverage parameters of the first coating on the first base film are different from those of the second coating on the second base film.

[0006] In some embodiments, the thermal runaway time of the first core is T1, and the thermal runaway time of the second core is T2, wherein T1 is not equal to T2.

[0007] In some embodiments, the second coating completely covers the second base film.

[0008] In some embodiments, the second coating partially covers the second base film, wherein the coverage area of ​​the second coating on the second base film is different from the coverage area of ​​the first coating on the first base film.

[0009] In some embodiments, the first coating includes a plurality of first sub-coatings, which are spaced apart.

[0010] In some embodiments, the second coating comprises a plurality of second sub-coatings, and the plurality of second sub-coatings are arranged at intervals; Wherein, the spacing between every two adjacent first sub-coatings in the first winding core is a first spacing, the spacing between every two adjacent second sub-coatings in the second winding core is a second spacing, and the first spacing is different from the second spacing.

[0011] In some embodiments, the unit cell comprises a plurality of first winding cores and a plurality of second winding cores, and the plurality of first winding cores and the plurality of second winding cores are arranged alternately along a first direction.

[0012] In some embodiments, the thickness of the first base film is H1, and the thickness of the first coating is H2, which satisfies: 3μm≤H1≤15μm, 0μm<H2≤10μm; The thickness of the second base film is H3, and the thickness of the second coating is H4, which satisfies: 3μm≤H3≤15μm, 0μm<H4≤10μm.

[0013] According to a second aspect of the present application, the present application provides a battery module, comprising the unit cell described above.

[0014] According to a third aspect of the present application, the present application provides an electrical device, comprising the unit cell described above, or the battery module described above.

[0015] An embodiment of the present application provides a unit cell, comprising a first winding core and a second winding core. The first winding core comprises a first separator, the first separator comprises a first base film and a first coating, wherein the first coating covers part of the first base film; the second winding core comprises a second separator, the second separator comprises a second base film and a second coating, wherein the second coating covers part or all of the second base film; wherein the coverage parameter of the first coating on the first base film is different from the coverage parameter of the second coating on the second base film. The first coating and the second coating are used to delay the propagation of thermal runaway. By differentially setting the coverage parameter of the first coating on the first base film and the coverage parameter of the second coating on the second base film, the occurrence time of thermal runaway of the first winding core and the second winding core can be separated, thereby reducing the maximum temperature inside the unit cell when thermal runaway occurs, and further improving the safety and reliability of the unit cell.

[0016] The battery module according to the embodiment of the present application comprises the unit cell described above, so the battery module can have all the technical features and beneficial effects of the above unit cell, which will not be repeated herein.

[0017] The electrical device according to the embodiment of the present application comprises the unit cell described above, or the battery module described above, so the electrical device can have all the technical features and beneficial effects of the above unit cell or the above battery module, which will not be repeated herein.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a schematic diagram of the structure of the first core provided in an exemplary embodiment of this application; Figure 2 This is a cross-sectional view of the first core provided in an exemplary embodiment of this application; Figure 3 yes Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the structure of the second core provided in an exemplary embodiment of this application; Figure 5 This is an exploded view of the second core provided in an exemplary embodiment of this application; Figure 6 This is a schematic diagram of the structure of the second core provided in yet another exemplary embodiment of this application; Figure 7 This is a schematic diagram of the double-core structure provided in an exemplary embodiment of this application; Figure 8 This is a schematic diagram of a double-core structure provided in another exemplary embodiment of this application; Figure 9 This is a schematic diagram of the structure of the battery pack provided in an exemplary embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. First core; 2. Second core; 3. Positive electrode sheet; 4. Positive electrode tab; 5. Negative electrode sheet; 6. Negative electrode tab; 10. First separator; 20. Second separator; 100. First base film; 101. First coating; 200. Second base film; 201. Second coating; 1000. Single cell; 1010. First sub-coating; 2010. Second sub-coating; X, First direction. Detailed Implementation

[0022] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0023] The applicant notes that lithium iron phosphate batteries are widely used in energy storage due to their high thermal stability and safety. However, even lithium iron phosphate batteries can experience thermal runaway under certain conditions, caused by factors such as internal short circuits, external heating, overcharging, mechanical damage, or battery aging. Thermal runaway can lead to battery overheating, expansion, voltage fluctuations, gas emissions, and even explosions in extreme cases.

[0024] The thermal runaway characteristics of lithium iron phosphate (LFP) batteries include the self-heating temperature, the thermal runaway trigger temperature, and the maximum thermal runaway temperature. In experiments under adiabatic conditions, a large 280 Ah LFP battery showed a self-heating temperature of approximately 70.26°C, a thermal runaway trigger temperature of 200.65°C, and a maximum temperature reaching 340.72°C. During thermal runaway, the battery may release a large amount of gas, including hydrogen and ethylene. The accumulation of these gases in a confined space can create significant pressure, increasing the risk of explosion.

[0025] In view of this, embodiments of this application provide a single-cell battery, including a first core and a second core. The first core includes a first separator, which includes a first base film and a first coating, wherein the first coating covers a portion of the first base film. The second core includes a second separator, which includes a second base film and a second coating, wherein the second coating covers a portion or all of the second base film. The coverage parameters of the first coating on the first base film and the coverage parameters of the second coating on the second base film are different. The first and second coatings are used to delay the propagation of thermal runaway. This application, by differentiating the coverage parameters of the first coating on the first base film and the second coating on the second base film, can extend the time between thermal runaway of the first core and the second core, thereby reducing the maximum temperature inside the single-cell battery when thermal runaway occurs, and thus improving the safety and reliability of the single-cell battery.

[0026] The single-cell battery, battery module, and power-consuming device of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0027] Figure 1 This is a schematic diagram of the structure of the first core 1 provided in an exemplary embodiment of this application; Figure 2 This is a cross-sectional view of the first core 1 provided in an exemplary embodiment of this application; Figure 3yes Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the structure of the second core 2 provided in an exemplary embodiment of this application; Figure 5 This is an exploded view of the second core 2 provided in an exemplary embodiment of this application; Figure 6 This is a schematic diagram of the structure of the second core 2 provided in yet another exemplary embodiment of this application; Figure 7 This is a schematic diagram of the double-core structure provided in an exemplary embodiment of this application; Figure 8 This is a schematic diagram of a double-core structure provided in another exemplary embodiment of this application.

[0028] This application provides a single-cell battery 1000, including a first core 1 and a second core 2, as shown in the following embodiment. Figures 1 to 3 The first core 1 and the second core 2 are arranged along the first direction X. The first core 1 includes a first diaphragm 10, which includes a first base film 100 and a first coating 101. The first coating 101 covers a portion of the first base film 100. The second core 2 includes a second diaphragm 20, which includes a second base film 200 and a second coating 201. The second coating 201 covers a portion or all of the second base film 200. (Refer to...) Figure 4 or Figure 6 The coverage parameters of the first coating 101 on the first base film 100 are different from those of the second coating 201 on the second base film 200. The first coating 101 and the second coating 201 are used to delay the propagation of thermal runaway. By differentiating the coverage parameters of the first coating 101 on the first base film 100 and the second coating 201 on the second base film 200, this application can extend the thermal runaway time of the first core 1 and the second core 2. This can effectively prevent multiple cores in the battery from experiencing thermal runaway simultaneously, thereby reducing the highest temperature inside the single cell 1000 when thermal runaway occurs, and thus improving the safety and reliability of the single cell 1000.

[0029] In some embodiments, refer to Figure 5 The second core 2 includes a positive electrode 3 and a negative electrode 5. A positive electrode tab 4 is provided on one side of the positive electrode 3. The negative electrode 5 and the positive electrode 3 are arranged alternately along the first direction X. A negative electrode tab 6 is provided on one side of the negative electrode 5. The second separator 20 is sandwiched between the positive electrode 3 and the negative electrode 5. The function of the second separator 20 is to isolate the positive electrode 3 and the negative electrode 5 to prevent short circuit, while allowing lithium ions to pass through.

[0030] Understandably, the second core 2 may include multiple positive electrode plates and multiple negative electrode plates. Each positive electrode plate has a positive electrode tab on one side, and each negative electrode plate has a negative electrode tab on one side. The multiple negative electrode plates and multiple positive electrode plates are arranged alternately along the first direction X. There are also multiple second separators, which are sandwiched between the positive and negative electrode plates; that is, each second separator is sandwiched between an adjacent set of positive and negative electrode plates.

[0031] Similarly, the first core 1 includes multiple positive electrode plates and multiple negative electrode plates. Each positive electrode plate has a positive electrode tab on one side, and each negative electrode plate has a negative electrode tab on one side. The multiple negative electrode plates and multiple positive electrode plates are arranged alternately along the first direction X. The first separator also includes multiple separators. One first separator is sandwiched between adjacent positive and negative electrode plates of the first core 1. The function of the first separator is to isolate the positive and negative electrode plates to prevent short circuits, while allowing lithium ions to pass through.

[0032] In some embodiments, the thermal runaway time of the first core 1 is T1, and the thermal runaway time of the second core 2 is T2, wherein T1 is not equal to T2. It is understood that the thermal runaway times of the first core 1 and the second core 2 are different by differentiating the coverage parameters of the first coating 101 on the first base film 100 and the coverage parameters of the second coating 201 on the second base film 200.

[0033] Understandably, the coverage parameter can be either the area covered or the thickness of the coverage.

[0034] In some embodiments, the first coating 101 covers a portion of the first base film 100, and the second coating 201 covers the entire second base film 200. When the coverage area of ​​the first coating 101 over the first base film 100 is smaller than the coverage area of ​​the second coating 201 over the second base film 200, the thermal runaway time T1 of the first core 1 is less than the thermal runaway time T2 of the second core 2, meaning that the thermal runaway of the second core 2 occurs later. Conversely, when the coverage area of ​​the first coating 101 over the first base film 100 is greater than the coverage area of ​​the second coating 201 over the second base film 200, the thermal runaway time T1 of the first core 1 is greater than the thermal runaway time T2 of the second core 2, meaning that the thermal runaway of the first core 1 occurs later.

[0035] In other embodiments, when the thickness of the first coating 101 covering the first base film 100 is greater than the thickness of the second coating 201 covering the second base film 200, the thermal runaway time T1 of the first core 1 is greater than the thermal runaway time T2 of the second core 2, meaning that the thermal runaway of the first core 1 occurs later. When the thickness of the first coating 101 covering the first base film 100 is less than the thickness of the second coating 201 covering the second base film 200, the thermal runaway time T1 of the first core 1 is less than the thermal runaway time T2 of the second core 2, meaning that the thermal runaway of the second core 2 occurs later.

[0036] Thus, by setting the thermal runaway occurrence time T1 of the first core 1 and the thermal runaway occurrence time T2 of the second core 2 differently, the heat accumulation caused by the simultaneous thermal runaway of the first core 1 and the second core 2 can be avoided, thereby reducing the maximum thermal runaway temperature within the single cell 1000, reducing safety risks such as explosion, and thus improving the safety and reliability of the single cell 1000.

[0037] For those who can understand, please refer to Figure 3 In the first core 1, the first coating 101 covers a portion of the first base film 100. This configuration results in different thermal response characteristics between the area covered by the first coating 101 and the area not covered by the first coating 101. For example, the thermal runaway gas ejection path in the area not covered by the first coating 101 can be referenced... Figure 3 As indicated by the arrow, by exposing part of the first base film 100, thermal runaway occurs earlier in the area not covered by the first coating 101.

[0038] In some embodiments, refer to Figure 4 The second coating 201 completely covers the second base film 200. Understandably, the temperature rise rate of the core with the coating completely covered is slower than that of the core with the coating only partially covered. Thus, the temperature rise in the first core 1 will be faster than that in the second core 2. In this way, the thermal runaway time of the first core 1 and the thermal runaway time of the second core 2 are staggered, thereby dispersing heat, avoiding a sharp rise in the overall temperature of the single cell 1000, reducing the maximum temperature reached by the single cell 1000 during thermal runaway, and reducing safety risks such as explosion.

[0039] In some embodiments, refer to Figure 6The second coating 201 partially covers the second base film 200, wherein the coverage area of ​​the second coating 201 on the second base film 200 is different from the coverage area of ​​the first coating 101 on the first base film 100. For example, the first coating 101 covers half of the first base film 100, and the second coating 201 covers three-quarters of the second base film 200. This application embodiment does not limit the coverage method of the first coating 101 and the second coating 201. It is understood that, with the same coating thickness, a larger coating core area corresponds to a slower temperature rise rate. As in the example above, the temperature rise rate of the second core 2 is slower than that of the first core 1. This delays the onset of thermal runaway for the first core 1 and the second core 2, preventing simultaneous thermal runaway and reducing the maximum temperature of thermal runaway within the single battery 1000, thereby reducing safety risks such as explosions and improving the safety and reliability of the single battery 1000.

[0040] In some embodiments, refer to Figure 1 The first coating 101 includes a plurality of first sub-coatings 1010, which are spaced apart. This arrangement creates intermittently weak areas on the surface of the first core 1, causing thermal runaway to occur preferentially in areas not covered by the first sub-coatings 1010, thus facilitating control of the thermal runaway time. The spacing between the plurality of first sub-coatings 1010 can be adjusted according to the size of the individual cell 1000.

[0041] In some embodiments, refer to Figure 1 and Figure 6 The second coating 201 includes multiple second sub-coatings 2010, which are spaced apart. In the first core 1, the spacing between two adjacent first sub-coatings 1010 is a first spacing, and in the second core 2, the spacing between two adjacent second sub-coatings 2010 is a second spacing. The first spacing and the second spacing are different. This arrangement creates intermittently weak areas on the surfaces of both the first core 1 and the second core 2 due to the spaced sub-coatings, causing thermal runaway to occur preferentially in areas not covered by sub-coatings. However, because the spacing between the sub-coatings on the first core 1 and the second core 2 is different, the temperature rise rates of the first core 1 and the second core 2 are also different. This allows the thermal runaway time of the first core 1 to be staggered from that of the second core 2, thus controlling the propagation speed of thermal runaway within the individual battery cell to a certain extent.

[0042] In some embodiments, the single cell 1000 includes a plurality of first cores 1 and a plurality of second cores 2, the plurality of first cores 1 and the plurality of second cores 2 being arranged alternately along a first direction X, where the first direction X is referred to. Figure 7 and Figure 8The arrows indicate that the first direction X is the arrangement direction of the positive and negative electrode plates. In the embodiments of this application, the single cell 1000 may have dual windings, with the first winding 1 and the second winding 2 arranged adjacent to each other. Specifically, in Figure 7 In the illustrated embodiment, the first coating 101 of the first core 1 partially covers the first base film 100, and the second coating 201 of the second core 2 completely covers the second base film 200. Figure 8 In the illustrated embodiment, the first coating 101 of the first core 1 covers a portion of the first base film 100, and the second coating 201 of the second core 2 also covers a portion of the second base film 200. However, the coverage parameters of the first coating 101 on the first base film 100 are different from those of the second coating 201 on the second base film 200. In the single cell 1000, the first core 1 and the second core 2 are arranged alternately. By controlling the timing and location of thermal runaway of the first core 1 and the second core 2, the probability of simultaneous runaway of adjacent first core 1 and second core 2 is reduced. This provides the battery management system with more time to respond to thermal runaway events, thereby taking corresponding measures to protect the single cell 1000 and user safety, reducing safety risks such as explosions, and ultimately improving the safety and reliability of the single cell 1000.

[0043] In some embodiments, the single cell 1000 may have four cores, including two first cores 1 and two second cores 2, which are arranged alternately along a first direction X. This arrangement, by controlling the timing and location of thermal runaway of the first cores 1 and second cores 2, reduces the probability of simultaneous runaway of adjacent first cores 1 and second cores 2, and disperses the thermal runaway gas, thereby reducing safety risks such as explosions and improving the safety and reliability of the single cell 1000.

[0044] In other embodiments, when the single cell 1000 has four cores, at least one of the four cores is a first core 1, and the remaining cores are second cores 2. Exemplarily, the single cell 1000 includes one first core 1 and three second cores 2. By controlling the timing and location of thermal runaway of the first core 1 and the second cores 2, more time can be provided to the battery management system to respond to thermal runaway events, thereby taking appropriate measures to protect the single cell 1000 and user safety, reducing safety risks such as explosions, and ultimately improving the safety and reliability of the single cell 1000.

[0045] In some embodiments, the thickness of the first base film is H1, satisfying: 3μm ≤ H1 ≤ 15μm. Exemplarily, the thickness range H1 of the first base film 100 can be any one or a range between any two of the following: 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, and 15μm. It is understood that by limiting the thickness H1 of the first base film 100 in this embodiment, on the one hand, when the thickness of the first base film 100 is less than or equal to 15μm, heat conduction can be accelerated, accelerating the heat release from the area not covered by the first coating 101, triggering thermal runaway earlier, and avoiding heat accumulation; on the other hand, when the thickness of the first base film 100 is greater than or equal to 3μm, the mechanical strength of the first base film 100 is ensured, avoiding structural fragility of the single-cell battery 1000 due to excessive thinness.

[0046] In some embodiments, the thickness of the second base film is H3, satisfying: 3μm ≤ H3 ≤ 15μm. Exemplarily, the thickness range H3 of the second base film 200 can be any one or a range between any two of the following: 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, and 15μm. It is understood that by limiting the thickness H3 of the second base film 200 in this embodiment, on the one hand, when the thickness of the second base film 200 is less than or equal to 15μm, heat conduction can be accelerated, accelerating the heat release from the area not covered by the second coating 201, triggering thermal runaway earlier, and avoiding heat accumulation; on the other hand, when the thickness of the second base film 200 is greater than or equal to 3μm, the mechanical strength of the second base film 200 can be ensured, avoiding structural fragility of the single-cell battery 1000 due to excessive thinness.

[0047] In some embodiments, the thickness of the first coating is H2, satisfying: 0μm < H2 ≤ 10μm; exemplarily, the thickness range H2 of the first coating 101 can be any one of 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, and 10μm, or a range between any two values. In other embodiments, the thickness of the second coating is H4, satisfying: 0μm < H4 ≤ 10μm; exemplarily, the thickness range H4 of the second coating 101 can be any one of 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, and 10μm, or a range between any two values.

[0048] It is understood that both the first coating 101 and the second coating 201 are used to delay the propagation of thermal runaway. If the thickness of the first coating 101 and the second coating 201 is too large, it will occupy the internal space of the single cell 1000 and increase the production cost. When the thickness of the first coating 101 and the second coating 201 meets the requirements, they can form a barrier to slow down the heat transfer rate, providing a basis for staggering the thermal runaway times of the first core 1 and the second core 2, avoiding the heat accumulation caused by the simultaneous thermal runaway of the first core 1 and the second core 2, thereby reducing the maximum temperature inside the single cell 1000. Specifically, in this embodiment, by differentiating the coverage thickness of the first coating 101 on the first base film 100 and the coverage thickness of the second coating 201 on the second base film 200, the thermal runaway time of the first core 1 and the second core 2 can be staggered. This can effectively prevent multiple cores inside the battery from thermally running away at the same time, thereby reducing the maximum temperature inside the single cell 1000 when thermal runaway occurs, and thus improving the safety and reliability of the single cell 1000.

[0049] Figure 9 This is a schematic diagram of the battery pack structure provided in an exemplary embodiment of this application, with reference to... Figure 9 According to a second aspect of this application, this application provides a battery module including the aforementioned single battery cell 1000. The battery module includes the aforementioned single battery cell, thereby enabling the battery module to possess all the technical features and effects of the single battery cell.

[0050] In some embodiments, refer to Figure 9 The battery module includes multiple individual battery cells 1000, which are arranged sequentially along a first direction X. Each individual battery cell 1000 includes a first core 1 and a second core 2, as shown in the figure. Figures 1 to 3 The first core 1 and the second core 2 are arranged along the first direction X. The first core 1 includes a first diaphragm 10, which includes a first base film 100 and a first coating 101. The first coating 101 covers a portion of the first base film 100. The second core 2 includes a second diaphragm 20, which includes a second base film 200 and a second coating 201. The second coating 201 covers a portion or all of the second base film 200. (Refer to...) Figure 4 or Figure 6The coverage parameters of the first coating 101 on the first base film 100 are different from those of the second coating 201 on the second base film 200. The first coating 101 and the second coating 201 are used to delay the propagation of thermal runaway. This application differentiates the coverage parameters of the first coating 101 on the first base film 100 and the second coating 201 on the second base film 200, thereby extending the thermal runaway time between the first core 1 and the second core 2, thus reducing the maximum temperature within the individual battery cell 1000 during thermal runaway, and improving the safety and reliability of the individual battery cell 1000. By controlling the thermal runaway time of the first core 1 and the second core 2 within different individual battery cells 1000, heat can be dispersed, preventing the concentrated release of energy from multiple individual battery cells 1000, reducing the maximum temperature reached by the individual battery cell 1000 during thermal runaway, thereby preventing a rapid rise in the overall temperature of the battery module and reducing the risk of cascading ignition and explosion of adjacent individual batteries.

[0051] According to a third aspect of this application, this application provides an electrical device comprising the aforementioned single battery cell 1000 or the aforementioned battery module. This electrical device can be various electrical equipment such as electric vehicles and energy storage systems. The electrical device comprises either the aforementioned single battery cell or the aforementioned battery module. It is understood that the electrical device can possess all the technical features and beneficial effects of the aforementioned single battery cell or battery module, which will not be elaborated further here.

[0052] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0054] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0055] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A single cell, characterized by, include: A first core, the first core including a positive electrode sheet, a negative electrode sheet and a first separator between the positive electrode sheet and the negative electrode sheet, the first separator including a first base film and a first coating, wherein the first coating covers a portion of the first base film; The second core includes a positive electrode sheet, a negative electrode sheet, and a second separator between the positive electrode sheet and the negative electrode sheet. The second separator includes a second base film and a second coating, wherein the second coating covers part or all of the second base film. Wherein, the coverage parameters of the first coating on the first base film are different from the coverage parameters of the second coating on the second base film. The coverage parameters include coverage area or coverage thickness, such that the thermal runaway time of the first core is T1 and the thermal runaway time of the second core is T2, wherein T1 is not equal to T2.

2. The cell according to claim 1, wherein The second coating completely covers the second base film.

3. The single-cell battery according to claim 1, characterized in that, The first coating includes a plurality of first sub-coatings, which are spaced apart.

4. The single-cell battery according to claim 3, characterized in that, The second coating includes a plurality of second sub-coatings, which are spaced apart. In the first core, the spacing between two adjacent first sub-coatings is a first spacing, and in the second core, the spacing between two adjacent second sub-coatings is a second spacing, wherein the first spacing and the second spacing are different.

5. The single-cell battery according to claim 1, characterized in that, The single cell includes a plurality of first cores and a plurality of second cores, which are arranged alternately along a first direction.

6. The single-cell battery according to claim 1, characterized in that, The thickness of the first base film is H1, and the thickness of the first coating is H2, satisfying: 3μm≤H1≤15μm, 0μm<H2≤10μm; The thickness of the second base film is H3, and the thickness of the second coating is H4, satisfying: 3μm≤H3≤15μm, 0μm<H4≤10μm.

7. A battery module, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 5.

8. An electrical device, characterized in that, Includes a single battery cell as described in any one of claims 1 to 6, or a battery module as described in claim 7.

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