A heating unit applied to a battery, a battery and an energy storage device

Abstract

The utility model discloses an application to heating unit, battery and energy storage device of battery, and heating unit includes heating unit body, two fixed support frame, first fastening connecting piece and second fastening connecting piece, heating unit body includes heating plate and with heating plate links to each other heating power cord, signal transmission line, environmental temperature probe, two fixed support frame sets up respectively at the upper surface and the lower surface of heating unit body, first fastening connecting piece includes first support frame mounting hole, second fastening connecting piece includes second support frame mounting hole, this application designs heating structure from battery interior, thereby improves the efficiency of heating, shortens the period of heating, reduces the waste of energy, adjusts heating strategy through internal temperature monitoring, improves the evenness of battery temperature.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a heating unit, battery, and energy storage device for use in batteries. Background Technology

[0002] Solid-state batteries are considered the next-generation energy storage technology due to their high energy density and safety, but their low-temperature performance remains a bottleneck for industrialization. Solid-state batteries suffer from the following problems at low temperatures: 1) Impaired ion transport: The grain boundary resistance of the solid electrolyte increases at low temperatures, resulting in a sharp decrease in charge and discharge efficiency; 2) Electrode-electrolyte interface failure: Due to thermal expansion and contraction, low temperatures often cause the electrode (such as the NCM cathode) and the solid electrolyte to shrink simultaneously, resulting in microcracks at the interface, leading to poor contact, a surge in contact resistance (greater than 300%), and accelerated capacity decay; 3) Kinetic hysteresis: The lithium-ion insertion / extraction barrier increases, and polarization becomes significant.

[0003] To address the aforementioned low-temperature issues, existing solutions primarily focus on system integration to resolve battery usage problems at low temperatures. These solutions involve laying or attaching a heat exchange material, often a PTC heating film, to the battery surface. Through contact between the battery surface and the heat exchange material, the temperature of adjacent batteries rises as the material heats up in low-temperature environments. However, this method suffers from high energy consumption. Reaching the battery's optimal operating temperature requires heating it from the outside in; if heating is done without an external power source, the battery's own energy is consumed, with energy density used for heat dissipation rather than effective work, thus indirectly reducing the battery's energy density. Furthermore, this method also suffers from long heating cycles, poor uniformity, and inaccurate temperature feedback results. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a heating unit, battery, and energy storage device for batteries. This invention designs the heating structure from within the battery, thereby improving heating efficiency, shortening the heating cycle, reducing energy waste, adjusting the heating strategy through internal temperature monitoring, and improving the uniformity of battery temperature.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a heating unit for a battery, comprising: a heating unit body, two fixed support frames, a first fastening connector, and a second fastening connector; wherein,

[0006] The heating unit body includes a heating plate and a heating power line, a signal transmission line, and an ambient temperature probe connected to the heating plate; the heating power line provides the required current and / or heating signal to the heating plate; the ambient temperature probe detects the temperature inside the battery; and the signal transmission line transmits signals.

[0007] The two fixed support frames are respectively disposed on the top and bottom of the heating unit body. The fixed support frame has a through hole in the middle and stepped structures on both sides of the through hole. The two fixed support frames fix the heating unit body between them through the stepped structures.

[0008] The first fastening connector includes a first support frame mounting hole, and one end of each of the two fixed support frames is fixed inside the first support frame mounting hole;

[0009] The second fastening connector includes a second support frame mounting hole, and the other ends of the two fixed support frames are fixed in the second support frame mounting hole.

[0010] Preferably, one end of the fixed support frame is provided with a first lead wire groove, and the first fastening connector is also provided with a first lead wire hole, through which the heating power line and signal transmission line are exposed from the first lead wire hole.

[0011] Preferably, the other end of the fixed support frame is provided with a second lead wire groove, and the second fastening connector is also provided with a second lead wire hole, through which the ambient temperature probe protrudes from the second lead wire hole.

[0012] Preferably, the fixed support frame has fastening connector slots at both ends, which are respectively engaged with the first support frame mounting hole of the first fastening connector and the second support frame mounting hole of the second fastening connector.

[0013] More preferably, the first fastening connector further includes a winding fixing positioning hole.

[0014] More preferably, the ambient temperature probe includes a first probe and a second probe. The first probe monitors the temperature inside the battery in real time; the second probe monitors the temperature of the heating unit in real time; when the monitoring result of either the first probe or the second probe is lower than a preset temperature, the heating unit is activated to heat up.

[0015] When the monitoring results of either the first probe or the second probe reach the preset temperature, the system switches to constant temperature mode to maintain heating; when the battery monitoring temperature feedback is higher than the heating unit temperature feedback, the heating unit is turned off.

[0016] Secondly, this application discloses a battery comprising the heating unit for use in a battery as described in the first aspect, characterized in that the battery includes a winding core, a heating unit, two positive and negative current collectors, two positive and negative current busbars, a battery casing, and two positive and negative cover plate assemblies; wherein...

[0017] The heating unit is located inside the winding core.

[0018] The two positive and negative current collectors are respectively disposed on both sides of the winding core;

[0019] The two positive and negative current collector plates are respectively disposed on the outside of the two positive and negative current collectors and fixed on both sides of the core to close the core.

[0020] The battery casing houses the winding core, heating unit, two positive and negative current collectors, and two positive and negative current collector segments inside it;

[0021] The two positive and negative electrode cover assemblies are respectively disposed on both sides of the battery casing to enclose the battery casing.

[0022] More preferably, the heating unit is located at the geometric center of the battery.

[0023] Preferably, the battery is square in shape with rounded corners at the edges, and has a length of 10mm-1000mm, a thickness of 1mm-200mm, and a width of 10mm-300mm.

[0024] Thirdly, this application also provides an energy storage device, which includes a battery in the heating unit of the battery as described in the first aspect, or a battery as described in the second aspect; the energy storage device includes a battery pack or a battery module.

[0025] This utility model provides a heating unit, battery, and energy storage device for batteries. The heating structure is designed from inside the battery to improve heating efficiency, shorten the heating cycle, reduce energy waste, adjust the heating strategy through internal temperature monitoring, and improve the uniformity of battery temperature. Attached Figure Description

[0026] Figure 1 An explosion diagram of a heating unit applied to a battery, provided as an embodiment of this utility model;

[0027] Figure 2 A schematic diagram of the heating unit body structure provided in an embodiment of this utility model;

[0028] Figure 3 A schematic diagram of a fixed support frame structure provided in an embodiment of this utility model;

[0029] Figure 4 A schematic diagram of a first fastening connector structure provided for an embodiment of this utility model. Figure 1 ;

[0030] Figure 5 A schematic diagram of a first fastening connector structure provided for an embodiment of this utility model. Figure 2 ;

[0031] Figure 6 A schematic diagram of a battery with a heating unit provided for an embodiment of this utility model;

[0032] Figure 7 An explosion diagram of a battery with a heating unit provided for an embodiment of this utility model;

[0033] Figure 8 A schematic diagram of a battery pack provided for an embodiment of this utility model;

[0034] In the diagram: 1. Heating unit; 2. Core; 3. Positive and negative current collectors; 4. Positive and negative current collector plates; 5. Positive and negative cover plate assembly; 6. Battery casing;

[0035] 101. Heating unit body; 1011. Heating plate; 1012. Heating power cord; 1013. Signal transmission line; 1014. Ambient temperature probe;

[0036] 102. Fixed support frame; 1021. Through hole; 1022. Stepped structure; 1023. First lead wire groove; 1024. Fastening connector slot;

[0037] 103. First fastening connector; 1031. First support frame mounting hole; 1032. First lead wire hole; 1033. Winding fixing and positioning hole;

[0038] 104. Second fastening connector. Detailed Implementation

[0039] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] The prism-shaped battery provided in this embodiment is an electrochemical battery, which can be a primary battery or a secondary battery. Primary batteries include zinc-manganese batteries, zinc-plated batteries, lithium iron batteries, etc., while secondary batteries include lithium-ion batteries, lithium metal batteries, sodium-ion batteries, aluminum-ion batteries, magnesium-ion batteries, etc., and are not limited to specific types. Furthermore, the battery in this application is not limited to liquid or solid-state batteries.

[0041] Figure 1 An exploded schematic diagram of a heating unit applied to a battery, as provided in this embodiment of the present invention, is shown below. Figure 1 As shown, the present invention provides a heating unit for a battery, comprising a heating unit body 101, two fixed support frames 102, a first fastening connector 103, and a second fastening connector 104. The following description, in conjunction with... Figure 1 A detailed description of its various structural parts is provided.

[0042] The heating unit body 101 is used to provide a heat source, such as Figure 2As shown, the battery specifically includes a heating plate 1011 and a heating power supply line 1012, a signal transmission line 1013, and an ambient temperature probe 1014 connected to the heating plate 1011. The heating plate 1011 can be heated by resistance, carbon-based materials, or electromagnetic induction. The heating power supply line 1012 provides the necessary current and / or heating signal to the heating plate 1011 via an external power supply. The ambient temperature probe 1014 is used to detect the temperature inside the battery. The signal transmission line 1013 is used for signal transmission, electrically connected to the heating power supply line 1012 and the ambient temperature probe 1014, transmitting the temperature inside the heating plate 1011 and the signal from the ambient temperature probe 1014 out of the battery. It should be noted that those skilled in the art can arrange the heating power line 1012, signal transmission line 1013, and ambient temperature probe 1014 as needed. In this embodiment, the heating power line 1012 and signal transmission line 1013 are arranged on one side of the heating unit body 101, and the ambient temperature probe 1014 is arranged on the other side.

[0043] Two fixed support frames 102, with a symmetrical structure, are used to fix the heating unit body 101, combined with Figure 3 As shown, the heating unit body 101 is respectively set on the top and bottom. The fixed support frame 102 has a through hole 1021 in the middle and a stepped structure 1022 on both sides of the through hole 1021 for clamping and snapping the heating plate 1011. The two fixed support frames 102 fix the heating unit body 101 between them through the stepped structure 1022. Preferably, the fixed support frame 102 is made of plastic material and has properties such as heat resistance and corrosion resistance.

[0044] First fastening connector 103, combined with Figure 4 and Figure 5 As shown, it includes a first support frame mounting hole 1031 for fixing one end of two fixed support frames 102. After the heating unit body 101 is clamped by the two fixed support frames 102, a first fastening connector 103 is installed at one end of the two fixed support frames 102, and one end of the two fixed support frames 102 is fixedly installed in the first support frame mounting hole 1031.

[0045] The second fastening connector 104 includes a second support frame mounting hole for fixing the other end of the two fixed support frames 102. After the two fixed support frames 102 clamp the heating unit body 101, the second fastening connector 104 is installed on the other end of the two fixed support frames 102, and the other end of the two fixed support frames 102 is fixed in the second support frame mounting hole.

[0046] In some specific embodiments, the two ends of the above-mentioned fixed support frames 102 are provided with fastening connector slots 1024, which are respectively engaged with the first support frame mounting hole 1031 of the first fastening connector 103 and the second support frame mounting hole of the second fastening connector 104, thereby realizing the fixation of the two ends of the fixed support frame 102 in the two fastening connectors.

[0047] Furthermore, the first fastening connector 103 also includes a winding fixing positioning hole 1033 for controlling the installation accuracy. The heating unit and the winding needle are concentric structures, thereby controlling the tension; otherwise, eccentric force will cause deviation. The winding fixing positioning hole 1033 is preferably provided on the outer wall of the first fastening connector 103. In this example, there are preferably three winding fixing positioning holes 1033. Of course, those skilled in the art can set the number of winding fixing positioning holes 1033 as needed. Correspondingly, the second fastening connector 104 can also be provided with corresponding winding fixing positioning holes 1033.

[0048] Preferably, the two fastening connectors can be made of metal. On the one hand, the fixed support frame 102 and the heating plate 1011 form a sandwich structure and are fixed by fastening connectors. On the other hand, the external parts need to be laser welded to the cover plate to achieve sealing inside the battery. The lead holes on its structure are sealed by potting glue after assembly.

[0049] In some specific embodiments, to facilitate the placement of the heating power cord 1012, signal transmission line 1013, and ambient temperature probe 1014, one end of the fixed support frame 102 is provided with a first lead-in groove 1023, and the first fastening connector 103 is also provided with a first lead-in hole 1032. The heating power cord 1012 and signal transmission line 1013 are exposed through the first lead-in groove 1023 and the first lead-in hole 1032, realizing the transmission of the heating power cord 1012 and signal transmission line 1013. Correspondingly, the other end of the fixed support frame 102 is provided with a second lead-in groove, and the second fastening connector 104 is also provided with a second lead-in hole. The ambient temperature probe 1014 is exposed through the second lead-in groove and the second lead-in hole for temperature monitoring.

[0050] In some specific embodiments, the ambient temperature probe 1014 includes a first probe and a second probe. The first probe is used to monitor the temperature inside the battery core 2 in real time, and the second probe is used to monitor the temperature inside the heating unit 1 in real time. The temperature control strategy of this application is as follows: when the monitoring result of either the first probe or the second probe is less than a preset temperature, for example, when the temperature of either probe is ≤-10℃, the heating unit 1 is started to heat. Further, when the monitoring result of either the second probe reaches the preset temperature, that is, after the temperature feedback of the heating unit 1 reaches the target temperature, it switches to a constant temperature mode to maintain heating; when the monitoring result of the first probe is higher than that of the second probe, that is, when the battery monitoring temperature feedback is higher than the temperature feedback of the heating unit 1, the heating unit 1 is turned off.

[0051] The above is a structural description of a heating unit 1 provided in this embodiment. This application also provides a battery that uses the above heating unit 1, and its structure will be described below.

[0052] Figure 6 This is a schematic diagram of the structure of a battery with a heating unit 1 provided in an embodiment of the present invention. Figure 7 An explosion diagram of a battery with a heating unit 1 is provided as an embodiment of this utility model, in conjunction with... Figure 6 and Figure 7 As shown, the battery includes a heating unit 1, a winding core 2, two positive and negative current collectors 3, two positive and negative current collector plates 4, a battery casing 6, and two positive and negative cover plate assemblies 5.

[0053] The core 2 comprises positive and negative electrode membranes and an electrolyte membrane (or separator).

[0054] Heating unit 1 is located inside the winding core 2, and its specific structure is as described above, so it will not be repeated here. Heating unit 1 is preferably located at the geometric center of the battery, so as to heat the battery evenly.

[0055] Two positive and negative current collectors 3 are respectively set on both sides of the core 2.

[0056] Two positive and negative current collectors 4 are respectively set on the outside of the two positive and negative current collectors 3 and fixed on both sides of the core 2 to seal the core 2.

[0057] The battery casing 6 houses the winding core 2, the heating unit 1, two positive and negative current collectors 3, and two positive and negative current collector plates 4.

[0058] Two positive and negative electrode cover plate assemblies 5 are respectively disposed on both sides of the battery housing 6, enclosing the battery housing 6. It can be understood that openings and slots adapted to fastening connectors are opened at corresponding positions of the core 2, positive and negative electrode current collectors 3, positive and negative electrode busbars 4, and positive and negative electrode cover plate assemblies 5, so as to fix the fastening connectors through the openings and slots.

[0059] In some preferred embodiments, the battery is square in shape with rounded corners at the edges. The battery is 10mm-1000mm long, 1mm-200mm thick, and 10mm-300mm wide.

[0060] To better understand this application, this application also provides an embodiment of a solid-state battery with a built-in resistance heating unit, as detailed below:

[0061] (1) Battery System

[0062] Cathode: Cathode materials include, but are not limited to, one or more of lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium-rich layered oxide, lithium nickel manganese oxide, lithium titanate, fluorinated graphite, MnO2, FeS2, FeF3, S, and sulfurized polyacrylonitrile.

[0063] Negative electrode: Negative electrode materials include, but are not limited to, Li4Ti5O 12 Highly stable pyrolytic graphite, artificial graphite, natural graphite, graphitized carbon fiber, graphitized mesophase carbon microspheres, hard carbon, soft carbon, carbon nanotubes, graphene and graphene composite anodes, silicon anodes, silicon suboxide, silicon-carbon composite anodes, lithium metal anodes, lithium alloys, composite lithium metal anodes, tin-based anodes, tin oxide anodes, and one or more of MoS2.

[0064] Electrolytes: These mainly include all-solid electrolytes and mixed solid-liquid electrolytes, and liquid electrolytes can also be used. The solid components in all-solid electrolytes and mixed solid-liquid electrolytes include, but are not limited to, perovskite type (lithium lanthanum titanium oxide), garnet type (lithium lanthanum zirconium oxide and its doping), NAS ICON type (lithium zirconium aluminum phosphate, lithium germanium aluminum phosphate), thin film type (Li PON) and other oxide solid electrolytes; glass / ceramic type (lithium silicon phosphorus sulfur, lithium phosphorus sulfur, lithium germanium phosphorus sulfur), halogen-doped type (lithium phosphorus sulfur chloride, lithium antimony sulfur iodine) and other sulfide solid electrolytes; lithium yttrium chloride, lithium indium chloride, lithium zirconium chloride, lithium zirconium bromide and other halide solid electrolytes; polyethylene oxide, polycarbonate, polyacrylonitrile, polyurethane, polyacrylate, polyvinylidene fluoride and other polymer solid electrolytes; and composite solid electrolytes of oxides / sulfides / halides and polymers. Liquid electrolytes include, but are not limited to, lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, and other liquid electrolyte materials; liquid electrolyte solvents include, but are not limited to, ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), etc.

[0065] Other: mainly includes key auxiliary materials such as ion conductor membranes, positive electrode current collectors, negative electrode current collectors, adhesives, conductive agents, additives, interface layers, and tabs.

[0066] (2) Battery Structure

[0067] Battery form: Square battery, wound into shape, with an insulating and heat-insulating film covering the battery surface.

[0068] Heating module: A plate-shaped structure integrated into the battery core, located at the geometric center of the battery.

[0069] (3) Preheating control method

[0070] Temperature detection: The heating unit has a built-in temperature sensor (such as an NTC thermistor) in dual-probe mode. One probe is led out to the inside of the battery (away from the heating unit) to monitor the battery temperature in real time; the other probe collects the real-time temperature of the heating unit.

[0071] Heating strategy: When the temperature of any probe is ≤-10℃, the heating unit is activated and the temperature is raised to 0℃ at a rate of 5℃ / min; pulse heating mode (on / off ratio 1:3) is used to continue heating to avoid local overheating; after the temperature feedback of the heating unit reaches the target temperature, it switches to constant temperature mode (±2℃ fluctuation) to maintain heating; when the temperature feedback of the battery monitoring is higher than the temperature feedback of the heating unit, the heating unit is turned off.

[0072] Furthermore, this application also provides an energy storage device comprising the above-mentioned... Figures 1-5 The battery used in the heating unit of the battery, or containing the above-mentioned Figures 6-7 The battery in the context; here, the energy storage device includes, but is not limited to, a battery pack or battery module, which consists of multiple batteries used in the heating unit of the battery, specifically as follows: Figure 8 As shown.

[0073] This utility model provides a heating unit, battery, and energy storage device for batteries, which can improve the low-temperature performance of batteries, increase the capacity retention rate of batteries in low-temperature environments, extend the service life of batteries, suppress lithium dendrites, enhance the interface stability of solid-state batteries, improve the fast charging capability of batteries, enable battery temperature equalization management, and directly and effectively monitor the internal temperature of batteries; enhance safety and reduce the risk of solid electrolyte cracking; and enhance wide temperature range adaptability.

[0074] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0075] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0076] In the description herein, the terms "a specific embodiment," "some embodiments," "one embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A heating unit for use in a battery, characterized in that, The heating unit includes a heating unit body, two fixed support frames, a first fastening connector, and a second fastening connector; wherein... The heating unit body includes a heating plate and a heating power line, a signal transmission line, and an ambient temperature probe connected to the heating plate; the heating power line provides the required current and / or heating signal to the heating plate; the ambient temperature probe detects the temperature inside the battery; and the signal transmission line transmits signals. The two fixed support frames are respectively disposed on the top and bottom of the heating unit body. The fixed support frame has a through hole in the middle and stepped structures on both sides of the through hole. The two fixed support frames fix the heating unit body between them through the stepped structures. The first fastening connector includes a first support frame mounting hole, and one end of each of the two fixed support frames is fixed inside the first support frame mounting hole; The second fastening connector includes a second support frame mounting hole, and the other ends of the two fixed support frames are fixed in the second support frame mounting hole.

2. The heating unit for a battery according to claim 1, characterized in that, One end of the fixed support frame is provided with a first lead wire groove, and the first fastening connector is also provided with a first lead wire hole. The heating power line and the signal transmission line are exposed from the first lead wire hole through the first lead wire groove.

3. The heating unit for a battery according to claim 1, characterized in that, The other end of the fixed support frame is provided with a second lead wire groove, and the second fastening connector is also provided with a second lead wire hole. The ambient temperature probe is exposed from the second lead wire hole through the second lead wire groove.

4. The heating unit for a battery according to claim 1, characterized in that, The fixed support frame has fastening connector slots at both ends, which are respectively engaged with the first support frame mounting hole of the first fastening connector and the second support frame mounting hole of the second fastening connector.

5. The heating unit for a battery according to any one of claims 1-4, characterized in that, The first fastening connector also includes a winding fixing positioning hole.

6. The heating unit for a battery according to any one of claims 1-4, characterized in that, The ambient temperature probe includes a first probe and a second probe. The first probe monitors the temperature inside the battery in real time; the second probe monitors the temperature of the heating unit in real time; when the monitoring result of either the first probe or the second probe is lower than the preset temperature, the heating unit is activated to heat up. When the monitoring results of either the first probe or the second probe reach the preset temperature, the system switches to constant temperature mode to maintain heating; when the battery monitoring temperature feedback is higher than the heating unit temperature feedback, the heating unit is turned off.

7. A battery comprising a heating unit for use in a battery as described in any one of claims 1-6, characterized in that, The battery includes a winding core, a heating unit, two positive and negative current collectors, two positive and negative current busbars, a battery casing, and two positive and negative cover plate assemblies; wherein, The heating unit is located inside the winding core. The two positive and negative current collectors are respectively disposed on both sides of the winding core; The two positive and negative current collector plates are respectively disposed on the outside of the two positive and negative current collectors and fixed on both sides of the core to close the core. The battery casing houses the winding core, heating unit, two positive and negative current collectors, and two positive and negative current collector segments inside it; The two positive and negative electrode cover assemblies are respectively disposed on both sides of the battery casing to enclose the battery casing.

8. The battery according to claim 7, characterized in that, The heating unit is located at the geometric center of the battery.

9. The battery according to claim 7, characterized in that, The battery is square in shape with rounded corners. The battery is 10mm-1000mm long, 1mm-200mm thick, and 10mm-300mm wide.

10. An energy storage device, characterized in that, The energy storage device includes a battery as described in any one of claims 1-6 for use in a battery heating unit, or includes a battery as described in any one of claims 7-9; the energy storage device includes a battery pack or a battery module.

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