Single battery, battery device with single battery, energy storage device and power utilization device

Abstract

The utility model discloses a single battery, a battery device with the single battery, an energy storage device and a power utilization device, the single battery comprises a shell, the shell is provided with an accommodating cavity, the shell is provided with two first side walls which are oppositely arranged in a first direction, and the first direction is the thickness direction of the single battery; the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises an electrode assembly main body and an electrode lug, and the electrode lug is connected with the electrode assembly main body; the first insulating part extends in the circumferential direction of the electrode assembly to form a ring shape, and the first insulating part is arranged on the outer side of the electrode assembly in a sleeving mode; the high-temperature-resistant insulating part is arranged between the first side wall and the tab, and the heat-resistant temperature of the high-temperature-resistant insulating part is higher than that of the first insulating part. According to the battery cell provided by the invention, the probability of thermal runaway of the battery cell in a high-temperature environment can be reduced, so that thermal runaway in a battery device is slowed down, and the risk of fire and explosion of the battery device is well reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device, an energy storage device and an electric device with the same. BACKGROUND

[0002] When the battery device appears thermal runaway, the internal temperature of the battery device is high, which causes the battery monomers in the battery device that do not appear thermal runaway to appear short circuit and thermal runaway under the influence of high temperature, thereby causing a series of thermal runaways in the battery device, aggravating the thermal runaway of the battery device, and increasing the risk of fire and explosion of the battery device.

[0003] SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the prior art. To this end, the present application proposes a battery monomer which can well reduce the probability of short circuit thermal runaway at high temperature, slow down the thermal runaway in the battery device, and reduce the risk of fire and explosion of the battery monomer and the battery device.

[0005] The present application also proposes a battery device with the above battery monomer.

[0006] The present application also proposes an energy storage device with the above battery monomer or battery device.

[0007] The present application also proposes an electric device with the above battery monomer or battery device or energy storage device.

[0008] According to the battery monomer of the first aspect of the present application, the battery monomer comprises a shell having a receiving cavity, the shell having two first side walls oppositely arranged in a first direction, the first direction being the thickness direction of the battery monomer; an electrode assembly provided in the receiving cavity, the electrode assembly comprising an electrode group body and a tab, the tab being connected to the electrode group body; a first insulating member extending in a circumferential direction of the electrode assembly in a ring shape, the first insulating member being sleeved on the outer side of the electrode assembly; a high-temperature-resistant insulating member provided between the first side wall and the tab, the heat-resistant temperature of the high-temperature-resistant insulating member being greater than the heat-resistant temperature of the first insulating member.

[0009] According to the battery cell of the present application, by arranging the high-temperature-resistant insulating piece between the first side wall and the tab, the heat-resistant temperature of the high-temperature-resistant insulating piece is greater than the heat-resistant temperature of the first insulating piece, so that when the battery device appears thermal runaway, the high-temperature-resistant insulating piece can play a good insulation effect on the tab and the first side wall in the battery cell, reducing the risk of short circuit caused by the tab and the first side wall, thereby reducing the probability of thermal runaway of the battery cell in a high-temperature environment, and further slowing down the thermal runaway in the battery device, and greatly reducing the risk of fire and explosion of the battery device.

[0010] In some embodiments of the present application, the heat-resistant temperature of the high-temperature-resistant insulating piece is greater than or equal to 200℃.

[0011] In the present embodiment, the heat-resistant temperature of the high-temperature-resistant insulating piece is set to be greater than or equal to 200℃, so that the high-temperature-resistant insulating piece can maintain a good structural state without melting in a high-temperature environment, and the high-temperature-resistant insulating piece can withstand a higher temperature, thereby meeting the need for the high-temperature-resistant insulating piece to stably play an insulation effect on the tab and the first side wall when thermal runaway occurs, reducing the probability of short circuit caused by the tab and the first side wall in a high-temperature environment, thereby reducing the probability of thermal runaway of the battery cell due to the high-temperature environment, and making the operation stability and reliability of the battery cell better, and making the battery device operate more stably and reliably.

[0012] In an embodiment of the present application, the heat-resistant temperature of the high-temperature-resistant insulating piece is greater than or equal to 400℃.

[0013] In the present embodiment, the heat-resistant temperature of the high-temperature-resistant insulating piece is further set to be greater than or equal to 400℃, so that the minimum environmental temperature that the high-temperature-resistant insulating piece can withstand is higher, thereby making the high-temperature-resistant insulating piece more stably and reliably maintain a good structural state and insulation performance when the battery device is in thermal runaway or in a high-temperature environment, and making the high-temperature-resistant insulating piece play a stable and reliable insulation and separation effect on the tab and the first side wall.

[0014] In some embodiments of the present application, in a projection plane perpendicular to the first direction, the projection of the tab is completely within the projection range of the high-temperature-resistant insulating piece.

[0015] In the present embodiment, the projection of the tab is completely within the projection range of the high-temperature-resistant insulating piece, so that the high-temperature-resistant insulating piece can play a stable and reliable insulation and separation effect on the tab and the first side wall, thereby further reducing the risk of short circuit caused by the tab and the first side wall, making the battery cell operate more stably and reliably in a high-temperature environment, and further reducing the risk of a series of thermal runaways of the battery cell due to the high-temperature environment when the battery device is in thermal runaway.

[0016] In some embodiments of the present application, the high-temperature-resistant insulating member is an insulating adhesive paper.

[0017] In the present embodiment, the high-temperature-resistant insulating member is an insulating adhesive paper, which is simple in structure and convenient to fix, and facilitates the assembly of the battery monomer.

[0018] In one embodiment of the present application, the thickness of the high-temperature-resistant insulating member is greater than or equal to 0.05 mm.

[0019] In the present embodiment, the thickness of the high-temperature-resistant insulating member is greater than or equal to 0.05 mm, so that the high-temperature-resistant insulating member has good structural strength and stable insulation performance, thereby enabling the high-temperature-resistant insulating member to stably and reliably perform the insulation separation function, and enabling the battery monomer to operate more stably and reliably.

[0020] In some embodiments of the present application, the high-temperature-resistant insulating member is an insulating coating layer coated on the first side wall.

[0021] In the present embodiment, the high-temperature-resistant insulating member is an insulating coating layer coated on the first side wall, which is simple in structure, convenient to form and firmly fixed, and enables the high-temperature-resistant insulating member to stably insulate and separate the tab and the first side wall.

[0022] In one embodiment of the present application, the thickness of the insulating coating layer is greater than or equal to 0.01 mm and less than or equal to 0.015 mm.

[0023] In the present embodiment, the thickness of the insulating coating layer is greater than or equal to 0.01 mm and less than or equal to 0.015 mm, so that the insulating coating layer has sufficient thickness to form a reliable insulation layer and has stable heat resistance, meets the insulation needs of the high-temperature-resistant insulating member, and enables the insulating coating layer to have less material, lower cost and higher efficiency in processing and forming, and enables the high-temperature-resistant insulating member to be more convenient to process and form.

[0024] In some embodiments of the present application, the high-temperature-resistant insulating member is an insulating oxide layer formed on the first side wall.

[0025] In the present embodiment, the high-temperature-resistant insulating member is an insulating oxide layer formed on the first side wall, which is simple in structure and convenient to form, and can well meet the needs of insulation and temperature resistance, and enables the high-temperature-resistant insulating member to stably perform the insulation function in a high-temperature environment, and enables the battery monomer to operate stably and reliably.

[0026] In one embodiment of the present application, the thickness of the insulating oxide layer is greater than or equal to 0.1 mm and less than or equal to 0.12 mm.

[0027] In the embodiment, the thickness of the insulation oxide layer is set to be greater than or equal to 0.1 mm and less than or equal to 0.12 mm, so that the insulation oxide layer has a sufficient thickness to form a reliable insulation layer and has stable heat resistance, meets the insulation requirements of the high-temperature-resistant insulation part, and the thickness of the insulation oxide layer is relatively thin, so that the processing and molding efficiency of the insulation oxide layer is relatively high.

[0028] In some embodiments of the present application, the high-temperature-resistant insulation part extends along the circumference of the electrode assembly in a ring shape.

[0029] In the embodiment, the high-temperature-resistant insulation part is arranged to extend along the circumference of the electrode assembly in a ring shape, so that the high-temperature-resistant insulation part can play a more stable and reliable insulation separation role between the tab and the inner wall of the accommodating cavity, so that the probability of lap joint short circuit between the tab and the first side wall or the inner wall of the accommodating cavity of the battery monomer in a high-temperature environment is further reduced, thereby making the operation stability and reliability of the battery monomer better.

[0030] In some embodiments of the present application, the size of the tab in the second direction is a first size, the size of the high-temperature-resistant insulation part in the second direction is a second size, the second size is greater than the first size, and the second direction is the length direction of the battery monomer.

[0031] In the embodiment, the second size of the high-temperature-resistant insulation part is greater than the first size of the tab, so that the high-temperature-resistant insulation part can stably and reliably cover the extension range of the tab in the second direction, so that the high-temperature-resistant insulation part can stably and reliably play an insulation separation role between the tab and the first side wall, and when the high-temperature-resistant insulation part is assembled and arranged in the battery monomer, the part of the high-temperature-resistant insulation part exceeding the tab in the second direction can compensate for the assembly error when the high-temperature-resistant insulation part is arranged and assembled with the tab, so that the high-temperature-resistant insulation part meets the condition of completely covering the extension range of the tab in the second direction for reliable insulation, the assembly and arrangement precision of the high-temperature-resistant insulation part and the tab is relatively low, and the arrangement and assembly of the high-temperature-resistant insulation part is relatively convenient and easy.

[0032] In an embodiment of the present application, in the second direction, both ends of the high-temperature-resistant insulation part exceed both ends of the tab.

[0033] In the embodiment, both ends of the high-temperature-resistant insulation part in the second direction are arranged to exceed both ends of the tab, which is simple in structure and convenient for adjusting and arranging the relative position of the high-temperature-resistant insulation part and the tab in the battery monomer, so that the high-temperature-resistant part can be arranged more conveniently under the condition of meeting the reliable insulation separation between the tab and the first side wall.

[0034] In an embodiment of the present application, in the second direction, the size of the part of any one end of the high-temperature-resistant insulation part exceeding the tab in the second direction is greater than or equal to 1 mm.

[0035] In the embodiment, the dimension of the part of the high-temperature-resistant insulating member beyond the tab in the second direction is greater than or equal to 1 mm, so that the part of the high-temperature-resistant insulating member beyond the tab has a sufficient dimension, and thus the high-temperature-resistant insulating member can stably cover the extension range of the tab in the second direction with a certain assembly error, so that the high-temperature-resistant insulating member has a lower assembly precision requirement and can be conveniently assembled and arranged in the battery monomer.

[0036] In some embodiments of the present application, the dimension of the tab in the third direction is a third dimension, the dimension of the high-temperature-resistant insulating member in the third direction is a fourth dimension, the fourth dimension is greater than the third dimension, and the third direction is the height direction of the battery monomer.

[0037] In the embodiment, the fourth dimension of the high-temperature-resistant insulating member is greater than the third dimension of the tab, so that the high-temperature-resistant insulating member can stably and reliably completely cover the extension range of the tab in the third direction, so that the high-temperature-resistant insulating member can stably and reliably insulate and separate the tab from the first side wall, and when the high-temperature-resistant insulating member is assembled and arranged in the battery monomer, the part of the high-temperature-resistant insulating member beyond the tab in the third direction can compensate for the assembly error when the high-temperature-resistant insulating member is arranged and assembled with the tab, so that the high-temperature-resistant insulating member has a lower assembly and arrangement precision with the tab when the high-temperature-resistant insulating member completely covers the extension range of the tab in the third direction for reliable insulation, and the high-temperature-resistant insulating member is conveniently and easily arranged and assembled.

[0038] In an embodiment of the present application, in the third direction, both ends of the high-temperature-resistant insulating member respectively beyond both ends of the tab.

[0039] In the embodiment, both ends of the high-temperature-resistant insulating member in the third direction are respectively arranged beyond both ends of the tab, so that the structure is simple, the relative position of the high-temperature-resistant insulating member and the tab in the battery monomer can be conveniently adjusted and arranged, and the high-temperature-resistant insulating member can be conveniently arranged under the condition of reliable insulation and separation of the tab from the first side wall.

[0040] In some examples of the present application, in the third direction, the dimension of the part of the high-temperature-resistant insulating member beyond the tab in the third direction is greater than or equal to 1 mm.

[0041] In the embodiment, the dimension of the part of the high-temperature-resistant insulating piece beyond the tab in the third direction is greater than or equal to 1 mm, so that the part of the high-temperature-resistant insulating piece beyond the tab has sufficient dimension, so that the high-temperature-resistant insulating piece can stably cover the extension range of the tab in the third direction with certain assembly error, so that the assembly precision requirement of the high-temperature-resistant insulating piece is low, and the high-temperature-resistant insulating piece can be conveniently assembled and arranged in the battery monomer.

[0042] In some embodiments of the application, the shell comprises: a main shell provided with a receiving groove, the receiving groove being open at at least one end in the third direction, two side walls of the main shell in the first direction being the first side walls; and an end cover covering the open end of the receiving groove, the tab being arranged at one end of the tab group body in the third direction facing the open end, the third direction intersecting the first direction.

[0043] In the embodiment, the shell comprises the main shell and the end cover, the end cover covering the open end of the receiving groove of the main shell, the structure is simple, and the assembly of the battery monomer is facilitated, the tab is arranged at one end of the tab group body in the third direction facing the open end, the tab is connected with the pole column and the like on the end cover, and the use requirement of the battery monomer is met.

[0044] In one embodiment of the application, in the third direction, the distance between the side edge of the high-temperature-resistant insulating piece on the side facing the open end and the end edge of the main shell on the end facing the end cover is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0045] In the embodiment, the distance between the side edge of the high-temperature-resistant insulating piece on the side facing the open end and the end edge of the main shell on the end facing the end cover is greater than or equal to 0.5 mm, so that the high-temperature-resistant insulating piece has sufficient distance with the end edge of the main shell for assembly welding of the end cover and the main shell, so that the battery monomer can be stably assembled, the distance between the side edge of the high-temperature-resistant insulating piece on the side facing the open end and the end edge of the main shell on the end facing the end cover is less than or equal to 2 mm, so that the high-temperature-resistant insulating piece can be conveniently arranged on the first side wall, and the relative position of the high-temperature-resistant insulating piece and the tab in the third direction meets the insulation requirement of the tab and the shell.

[0046] According to the battery device of the second aspect of the application, the battery monomer is the battery monomer of the first aspect of the application.

[0047] According to the battery device of the present application, by arranging the battery monomer of the first aspect, by arranging the high-temperature-resistant insulating piece between the first side wall and the tab, the heat-resistant temperature of the high-temperature-resistant insulating piece is greater than the heat-resistant temperature of the first insulating piece, when the battery device appears thermal runaway, the high-temperature-resistant insulating piece can play a stable and good insulating effect on the tab and the first side wall in the battery monomer, reducing the risk of short circuit of the tab and the first side wall, thereby reducing the probability of thermal runaway of the battery monomer in a high-temperature environment, further slowing down the thermal runaway in the battery device, and well reducing the risk of fire and explosion of the battery device.

[0048] According to the energy storage device of the third aspect of the present application, it comprises the battery monomer of the first aspect of the present application or the battery device of the second aspect of the present application.

[0049] According to the energy storage device of the present application, by arranging the battery monomer of the first aspect or the battery device of the second aspect, by arranging the high-temperature-resistant insulating piece between the first side wall and the tab, the heat-resistant temperature of the high-temperature-resistant insulating piece is greater than the heat-resistant temperature of the first insulating piece, when the battery device appears thermal runaway, the high-temperature-resistant insulating piece can play a stable and good insulating effect on the tab and the first side wall in the battery monomer, reducing the risk of short circuit of the tab and the first side wall, thereby reducing the probability of thermal runaway of the battery monomer in a high-temperature environment, further slowing down the thermal runaway in the battery device, and well reducing the risk of fire and explosion of the battery device.

[0050] According to the energy storage device of the third aspect of the present application, it comprises the battery monomer of the first aspect of the present application or the battery device of the second aspect of the present application.

[0051] According to the energy storage device of the present application, by arranging the battery monomer of the first aspect or the battery device of the second aspect, by arranging the high-temperature-resistant insulating piece between the first side wall and the tab, the heat-resistant temperature of the high-temperature-resistant insulating piece is greater than the heat-resistant temperature of the first insulating piece, when the battery device appears thermal runaway, the high-temperature-resistant insulating piece can play a stable and good insulating effect on the tab and the first side wall in the battery monomer, reducing the risk of short circuit of the tab and the first side wall, thereby reducing the probability of thermal runaway of the battery monomer in a high-temperature environment, further slowing down the thermal runaway in the battery device, and well reducing the risk of fire and explosion of the battery device.

[0052] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a schematic diagram of a power-using device according to an embodiment of the present application;

[0054] Figure 2 is a schematic view of a battery device according to an embodiment of the present application;

[0055] Figure 3 is an exploded view of a battery cell according to an embodiment of the present application;

[0056] Figure 4 is a schematic view of a battery cell according to an embodiment of the present application;

[0057] Figure 5 is Figure 4 is a sectional view at A-A shown in FIG. 1;

[0058] Figure 6 is Figure 5 is a partially enlarged schematic view at B shown in FIG. 1;

[0059] Figure 7 is a schematic view of a main case and an electrode assembly, a tab, and a high-temperature-resistant insulating member of a battery cell according to an embodiment of the present application;

[0060] Figure 8 is a schematic view of a main case and an electrode assembly, a tab, and a high-temperature-resistant insulating member of a battery cell according to an embodiment of the present application;

[0061] Figure 9 is a schematic view of a main case of a battery cell according to an embodiment of the present application;

[0062] Figure 10 is Figure 9 is a sectional view at C-C shown in FIG. 1;

[0063] Figure 11 is Figure 10 is a partially enlarged schematic view at D shown in FIG. 1.

[0064] Reference Signs:

[0065] 10, battery cell; 101, accommodation cavity;

[0066] 11, case; 111, main case; 1111, first side wall; 112, end cap;

[0067] 12, tab; 13, electrode assembly; 131, pole group body; 132, pole tab;

[0068] 14, first insulating member; 15, second insulating member; 16, high-temperature-resistant insulating member;

[0069] 100, battery device; 200, motor; 300, controller;

[0070] 1000, electric device. DETAILED DESCRIPTION

[0071] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0073] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0074] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0075] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two).

[0076] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0078] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include one or more battery cells, and when there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection through a busbar component.

[0079] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0080] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0081] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0082] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0083] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0084] As an example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0085] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beams and longitudinal beams of the vehicle.

[0086] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of the box being provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0087] The battery cell mentioned in the embodiments of the present application can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and the embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the embodiments of the present application are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft package battery cells, and the embodiments of the present application are not limited thereto.

[0088] As an example, the battery cell can generally include a shell, an electrode assembly, and an electrolyte, the shell being used to accommodate the electrode assembly and the electrolyte, and the shell being provided with at least one positive pole and at least one negative pole. The electrode assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator film.

[0089] The positive electrode sheet can generally include a positive current collector and a positive active material layer, and the positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer, and the positive current collector without the positive active material layer serves as a positive tab sheet. A plurality of positive tab sheets are stacked together and electrically connected to the positive pole. As an example, the plurality of positive tab sheets stacked together can be directly welded to the positive pole to form an electrical connection. Alternatively, the electrode assembly can further include a positive adapter sheet, and the plurality of positive tab sheets stacked together are welded to one end of the positive adapter sheet, and the other end of the positive adapter sheet is welded to the positive pole, so that the positive tab sheet and the positive pole form an electrical connection.

[0090] The negative electrode tab can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protruding from the negative electrode current collector with the negative electrode active material layer, the negative electrode current collector without the negative electrode active material layer serving as a negative electrode tab, a plurality of negative electrode tabs being stacked together and electrically connected to the negative electrode post. For example, the plurality of negative electrode tabs stacked together can be directly welded to the negative electrode post to form an electrical connection; or the battery cell assembly can further include a negative electrode adapter plate, the plurality of negative electrode tabs stacked together being welded to one end of the negative electrode adapter plate, the other end of the negative electrode adapter plate being welded to the negative electrode post, so that the negative electrode tabs are electrically connected to the negative electrode post. The material of the separator is not limited, for example, it can be polypropylene or polyethylene, etc.

[0091] At the same time, the battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. For example, in a lithium ion battery, the material of the positive electrode current collector can be aluminum, the material of the positive electrode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc., the material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During charging and discharging, Li+ moves back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharging, the opposite is true.

[0092] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles and spacecraft, etc.

[0093] In the new energy industry, the battery device plays an irreplaceable important role as the power source of new energy vehicles, and the new energy vehicles have high requirements for the stability and reliability of the battery device.

[0094] When the battery device is in thermal runaway, some battery cells in the battery device are in thermal runaway, causing the battery cells adjacent to or in the entire battery device to be in a high-temperature environment. Under the influence of the high-temperature environment, the insulating structure in the battery cell that is not in thermal runaway melts at a high temperature, for example, when the temperature of the battery cell exceeds the melting point of the insulating structure, the insulating structure melts, causing the tab of the electrode assembly in the battery cell to come into contact with the shell of the battery cell, thereby causing the battery cell to short circuit and enter thermal runaway. As a result, the number of battery cells in thermal runaway in the battery device increases further, and the temperature in the battery device increases further, which in turn causes more battery cells to enter thermal runaway, thereby causing a chain of thermal runaway, intensifying the thermal runaway of the battery device, and increasing the risk of fire and explosion of the battery device or the battery cells therein.

[0095] Based on the above considerations, in order to reduce the probability of short circuit caused by the failure of the internal insulating structure of the battery cell under a high-temperature environment when the battery device is in thermal runaway, slow down the thermal runaway of the battery device, and reduce the risk of fire and explosion of the battery device or the battery cell, the present application designs a battery cell. The battery cell is provided with a high-temperature-resistant insulating piece between the first side wall and the tab, and the heat-resistant temperature of the high-temperature-resistant insulating piece is greater than the heat-resistant temperature of the first insulating piece. When the battery cell is in a high-temperature environment, even if the first insulating piece melts and deforms, the high-temperature-resistant insulating piece can still maintain a stable structural state and insulating performance, so that the tab and the first side wall maintain a stable and reliable insulation effect, greatly reducing the risk of short circuit caused by the tab and the first side wall overlapping in the battery cell, thereby slowing down the thermal runaway of the battery device and reducing the risk of fire and explosion of the battery device.

[0096] The embodiments of the present application provide a power consumption device using the battery cell of the embodiments as a power source. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0097] The following embodiments take the power consumption device 1000 as an example to introduce the structure of the power consumption device 1000, the battery device 100, and the battery cell 10 in detail.

[0098] Reference Figure 1 As shown, Figure 1The power utilization device 1000 provided in some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle is provided with a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle. The battery device 100 can be used for power supply of the vehicle, for example, the battery device 100 can be used as an operating power source of the vehicle. The vehicle can further include a controller 300 and a motor 200, and the controller 300 is used to control the battery device 100 to supply power to the motor 200, for example, to meet the working power demand of the vehicle during starting, navigation, and driving. In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0099] Reference Figures 2-11 As shown in Figure 1 is a schematic diagram of a power utilization device 1000 according to an embodiment of the present application; Figure 2 is a schematic diagram of a battery device 100 according to an embodiment of the present application; Figure 3 is an exploded view of a battery monomer 10 according to an embodiment of the present application; Figure 4 is a schematic diagram of a battery monomer 10 according to an embodiment of the present application; Figure 5 is Figure 4 is a sectional view at A-A shown in Figure 6 is Figure 5 is a partially enlarged schematic diagram at B shown in Figure 7 is a schematic diagram of a main shell 111 of a battery monomer 10 and an electrode assembly 13, a connecting sheet 12, and a high-temperature-resistant insulating piece 16 according to an embodiment of the present application; Figure 8 is a schematic diagram of a main shell 111 of a battery monomer 10 and an electrode assembly 13, a connecting sheet 12, and a high-temperature-resistant insulating piece 16 according to an embodiment of the present application; Figure 9 is a schematic diagram of a main shell 111 of a battery monomer 10 according to an embodiment of the present application; Figure 10 is Figure 9 is a sectional view at C-C shown in Figure 11 is Figure 10 is a partially enlarged schematic diagram at D shown in

[0100] As Figures 3-11 shown, the battery monomer 10 according to the first aspect of the present application includes a shell 11, an electrode assembly 13, a first insulating piece 14, and a high-temperature-resistant insulating piece 16.

[0101] Specifically, the shell 11 has a receiving cavity 101, and the shell 11 has a first direction (such as the direction of the arrow A shown in Figure 3The first direction is the thickness direction of the battery monomer 10; the electrode assembly 13 is arranged in the accommodating cavity 101, the electrode assembly 13 includes a pole group body 131 and a tab 132 connected with the pole group body 131; the first insulating piece 14 extends along the circumference of the electrode assembly 13 in a ring shape, and the first insulating piece 14 is sleeved on the outer side of the electrode assembly 13; the high-temperature-resistant insulating piece 16 is arranged between the first side wall 1111 and the tab 132, and the heat-resistant temperature of the high-temperature-resistant insulating piece 16 is greater than the heat-resistant temperature of the first insulating piece 14.

[0102] In the embodiment, the shell 11 is formed with an accommodating cavity 101, and the electrode assembly 13, the electrolyte, the first insulating piece 14 and the high-temperature-resistant insulating piece 16 of the battery monomer 10 can be arranged in the accommodating cavity 101; the shell 11 is formed with two first side walls 1111 arranged oppositely in the thickness direction of the battery monomer 10, so that the electrode assembly 13 can be located between the two first side walls 1111 in the thickness direction, and specifically, the pole group body 131 and the tab 132 of the electrode assembly 13 are arranged between the two first side walls 1111.

[0103] In the embodiment, the electrode assembly 13 includes a pole group body 131 and a tab 132 connected with the pole group body 131; for example, the electrode assembly 13 can be formed by winding a positive electrode sheet, a negative electrode sheet and a separator, the tab 132 can be a tab cluster formed by a plurality of positive tabs of the positive electrode sheet, and the tab 132 can also be a tab cluster formed by a plurality of negative tabs of the negative electrode sheet; the part of the electrode assembly 13 except the tab 132 forms the pole group body 131, and the electrode assembly 13 is connected with the pole of the battery monomer 10 through the tab 132 to meet the use and operation requirements of the battery monomer 10.

[0104] The first insulating piece 14 extends along the circumference of the electrode assembly 13 in a ring shape and is sleeved on the outer side of the electrode assembly 13; in the circumferential direction of the electrode assembly 13, the first insulating piece 14 is arranged between the electrode assembly 13 and the inner wall of the accommodating cavity 101 of the shell 11 to play an insulating role on the electrode assembly 13 and the shell 11; in the thickness direction of the battery monomer 10, the part structure of the first insulating piece 14 is arranged between each first side wall 1111 and the electrode assembly 13.

[0105] In the embodiment, the high-temperature-resistant insulating piece 16 is arranged between the first side wall 1111 and the tab 132, that is, the high-temperature-resistant insulating piece 16 is arranged between each first side wall 1111 and the tab 132 of the electrode assembly 13; the high-temperature-resistant insulating pieces 16 between the two first side walls 1111 and the tab 132 can be two independent high-temperature-resistant insulating pieces 16, or the high-temperature-resistant insulating pieces 16 between the two first side walls 1111 and the tab 132 can be part structures of the same high-temperature-resistant insulating piece 16.

[0106] Exemplarily, the high-temperature-resistant insulating piece 16 of the embodiment can be arranged between the first insulating piece 14 and the first side wall 1111, and the high-temperature-resistant insulating piece 16 can also be arranged between the first insulating piece 14 and the electrode assembly 13 as needed.

[0107] The heat-resistant temperature of the high-temperature-resistant insulating piece 16 in the embodiment is greater than the heat-resistant temperature of the first insulating piece 14. Here, the heat-resistant temperature can refer to the melting point. Therefore, the melting point of the high-temperature-resistant insulating piece 16 is greater than the melting point of the first insulating piece 14. In the embodiment, the heat-resistant temperature of the high-temperature-resistant insulating piece 16 can be greater than the maximum temperature that can be reached in the battery device 100 when the battery device 100 is in thermal runaway. When the temperature at which the battery monomer 10 is located exceeds the heat-resistant temperature of the first insulating piece 14, the first insulating piece 14 melts due to heat, and the high-temperature-resistant insulating piece 16 can remain in a good structural state.

[0108] In the embodiment, the high-temperature-resistant insulating piece 16 is arranged between the first side wall 1111 and the tab 132, and the heat-resistant temperature of the high-temperature-resistant insulating piece 16 is greater than the heat-resistant temperature of the first insulating piece 14. When the battery device 100 is in thermal runaway, the battery monomer 10 is in a high-temperature environment. Even if the first insulating piece 14 melts due to heat, the high-temperature-resistant insulating piece 16 can still remain in a stable structural state and insulation performance. The probability of the tab 132 and the first side wall 1111 being overlapped after the first insulating piece 14 melts is greatly reduced. Therefore, the probability of the battery monomer 10 being in thermal runaway due to the tab 132 and the first side wall 1111 being overlapped in a high-temperature environment is greatly reduced. The operation stability and reliability of the battery monomer 10 are better. The situation that the battery monomer 10 in the battery device 100 is in thermal runaway due to a high-temperature environment is reduced. Therefore, the probability that a series of thermal runaways is triggered after the battery device 100 is in thermal runaway is reduced. The spread and diffusion of thermal runaway in the battery device 100 are greatly slowed down. The risk of fire and explosion of the battery device 100 is greatly reduced.

[0109] According to the battery monomer 10 of the embodiment of the application, the high-temperature-resistant insulating piece 16 is arranged between the first side wall 1111 and the tab 132, and the heat-resistant temperature of the high-temperature-resistant insulating piece 16 is greater than the heat-resistant temperature of the first insulating piece 14. When the battery device 100 is in thermal runaway, the high-temperature-resistant insulating piece 16 can play a stable and good insulation role on the tab 132 and the first side wall 1111 in the battery monomer 10. The risk of the tab 132 and the first side wall 1111 being overlapped is reduced. Therefore, the probability of the battery monomer 10 being in thermal runaway in a high-temperature environment is reduced. The thermal runaway in the battery device 100 is slowed down. The risk of fire and explosion of the battery device 100 is greatly reduced.

[0110] In some embodiments of the application, the heat-resistant temperature of the high-temperature-resistant insulating piece 16 can be greater than or equal to 200℃.

[0111] In this embodiment, the heat-resistant temperature of the heat-resistant insulation part 16 is greater than or equal to 200℃. For example, the heat-resistant temperature of the heat-resistant insulation part 16 can be 200℃, 201℃, 203℃, 205℃, 210℃, 250℃, 300℃, 400℃, 420℃, 450℃, 500℃, etc.

[0112] In this embodiment, the heat-resistant temperature of the heat-resistant insulation part 16 is greater than or equal to 200℃. For example, the heat-resistant temperature of the heat-resistant insulation part 16 can be 200℃, 201℃, 203℃, 205℃, 210℃, 250℃, 300℃, 400℃, 420℃, 450℃, 500℃, etc.

[0113] In one embodiment of the present application, the heat-resistant temperature of the heat-resistant insulation part 16 can be greater than or equal to 400℃.

[0114] In this embodiment, the heat-resistant temperature of the heat-resistant insulation part 16 is greater than or equal to 400℃. For example, the heat-resistant temperature of the heat-resistant insulation part 16 can be 400℃, 401℃, 403℃, 405℃, 410℃, 450℃, 500℃, 600℃, 620℃, 650℃, 700℃, etc.

[0115] In this embodiment, the heat-resistant temperature of the heat-resistant insulation part 16 is greater than or equal to 400℃. For example, the heat-resistant temperature of the heat-resistant insulation part 16 can be 400℃, 401℃, 403℃, 405℃, 410℃, 450℃, 500℃, 600℃, 620℃, 650℃, 700℃, etc.

[0116] In some embodiments of the present application, with reference to Figure 3 and Figure 7 As shown in the drawings, in the projection plane perpendicular to the first direction, the projection of the tab 132 can be completely within the projection range of the heat-resistant insulation part 16.

[0117] In the embodiment, the projection of the tab 132 is completely within the projection range of the high-temperature-resistant insulating piece 16 on the projection plane perpendicular to the first direction, i.e., on the projection plane perpendicular to the thickness direction of the battery monomer 10. Therefore, in the first direction, the high-temperature-resistant insulating piece 16 completely separates the tab 132 from the first side wall 1111. When the first insulating piece 14 melts due to heat when the battery monomer 10 is in a high-temperature environment, any part of the tab 132 is separated from the first side wall 1111 by the high-temperature-resistant insulating piece 16.

[0118] In the embodiment, the projection of the tab 132 is completely within the projection range of the high-temperature-resistant insulating piece 16, so that the high-temperature-resistant insulating piece 16 can stably and reliably insulate and separate the tab 132 from the first side wall 1111, thereby further reducing the risk of short circuit caused by the tab 132 and the first side wall 1111, making the battery monomer 10 more stable and reliable when operating in a high-temperature environment, and further reducing the risk of a series of thermal runaway of the battery monomer 10 due to a high-temperature environment when the battery device 100 experiences thermal runaway.

[0119] In some embodiments of the present application, referring to Figure 7 As shown, the high-temperature-resistant insulating piece 16 can be an insulating adhesive paper.

[0120] In the embodiment, the high-temperature-resistant insulating piece 16 is an insulating adhesive paper. For example, the insulating adhesive paper can be a polyimide adhesive paper, which meets the insulation and heat resistance requirements of the embodiment. When the high-temperature-resistant insulating piece 16 is arranged in the battery monomer 10, the insulating adhesive paper can be directly bonded and fixed to the corresponding position of the first side wall 1111.

[0121] In the embodiment, the high-temperature-resistant insulating piece 16 is an insulating adhesive paper, which has a simple structure, is easy to fix, and is convenient for assembling the battery monomer 10.

[0122] In an embodiment of the present application, the thickness of the high-temperature-resistant insulating piece 16 can be greater than or equal to 0.05 mm.

[0123] In the embodiment, the thickness of the high-temperature-resistant insulating piece 16 is greater than or equal to 0.05 mm, for example, the thickness of the high-temperature-resistant insulating piece 16 can be 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.15 mm, etc.

[0124] In the embodiment, the thickness of the high-temperature-resistant insulating piece 16 is greater than or equal to 0.05 mm, so that the high-temperature-resistant insulating piece 16 has good structural strength and stable insulation performance, thereby stably and reliably insulating and separating the tab 132 from the first side wall 1111, and making the battery monomer 10 operate more stably and reliably.

[0125] In some embodiments of the present application, referring to Figure 7 The high-temperature-resistant insulating part 16 can be an insulating coating layer coated on the first sidewall 1111.

[0126] In the present embodiment, the high-temperature-resistant insulating part 16 is configured as an insulating coating layer coated on the first sidewall 1111. The high-temperature-resistant insulating part 16 can be formed by spraying an insulating high-temperature-resistant material on the corresponding position of the first sidewall 1111 to form an insulating coating layer. The insulating coating layer can be an epoxy resin layer or other coating layer that meets the requirements of high-temperature resistance and insulation.

[0127] In the present embodiment, the high-temperature-resistant insulating part 16 is configured as an insulating coating layer coated on the first sidewall 1111. The high-temperature-resistant insulating part 16 can be formed by spraying an insulating high-temperature-resistant material on the corresponding position of the first sidewall 1111 to form an insulating coating layer. The insulating coating layer can be an epoxy resin layer or other coating layer that meets the requirements of high-temperature resistance and insulation.

[0128] In one embodiment of the present application, the thickness of the insulating coating layer can be greater than or equal to 0.01 mm and less than or equal to 0.015 mm.

[0129] In the present embodiment, the thickness of the insulating coating layer is set to be greater than or equal to 0.01 mm and less than or equal to 0.015 mm. For example, the thickness of the insulating coating layer can be 0.01 mm, 0.011 mm, 0.012 mm, 0.0125 mm, 0.013 mm, 0.015 mm, etc.

[0130] In the present embodiment, the thickness of the insulating coating layer is set to be greater than or equal to 0.01 mm and less than or equal to 0.015 mm. This makes the insulating coating layer have sufficient thickness to form a reliable insulating layer and have stable heat resistance, meets the insulation needs of the high-temperature-resistant insulating part 16, and makes the use of the insulating coating layer less, so that the cost of the insulating coating layer is lower and the processing and molding efficiency is higher, making the processing and molding of the high-temperature-resistant insulating part 16 more convenient.

[0131] In some embodiments of the present application, referring to Figure 7 The high-temperature-resistant insulating part 16 can be an insulating oxide layer formed on the first sidewall 1111.

[0132] In the present embodiment, the high-temperature-resistant insulating part 16 is configured as an insulating oxide layer formed on the first sidewall 1111. For example, the insulating oxide layer can be formed on the first sidewall 1111 by anodic oxidation. The insulating oxide layer has good insulation and heat resistance, and good structural stability.

[0133] In this embodiment, the high-temperature resistant insulating component 16 is set as an insulating oxide layer formed on the first sidewall 1111. The structure is simple and easy to form, which can well meet the requirements of insulation and temperature resistance, so that the high-temperature resistant insulating component 16 can stably play an insulating role in a high-temperature environment, and the battery cell 10 can operate stably and reliably.

[0134] In one embodiment of this application, the thickness of the insulating oxide layer may be greater than or equal to 0.1 mm and less than or equal to 0.12 mm.

[0135] In this embodiment, the thickness of the insulating oxide layer is set to be greater than or equal to 0.1 mm and less than or equal to 0.12 mm. For example, the thickness of the insulating oxide layer can be 0.1 mm, 0.102 mm, 0.105 mm, 0.11 mm, 0.115 mm, 0.117 mm, 0.12 mm, etc.

[0136] In this embodiment, the thickness of the insulating oxide layer is set to be greater than or equal to 0.1 mm and less than or equal to 0.12 mm, so that the insulating oxide layer has sufficient thickness to form a reliable insulating layer and has stable heat resistance, meeting the insulation requirements of the high-temperature insulating component 16, and the thickness of the insulating oxide layer is relatively thin, so that the processing and forming efficiency of the insulating oxide layer is high.

[0137] In some embodiments of this application, the high-temperature resistant insulating element 16 may extend in a ring shape along the circumference of the electrode assembly 13.

[0138] The high-temperature resistant insulating member 16 extends in a ring shape along the circumference of the electrode assembly 13. In the circumference of the tab 132, the high-temperature resistant insulating member 16 is always located between the tab 132 and the inner wall of the receiving cavity 101. The portion of the high-temperature resistant insulating member 16 between the first side wall 1111 and the tab 132 separates the tab 132 from the first side wall 1111.

[0139] In this embodiment, the high-temperature resistant insulating component 16 is configured to extend in a ring along the circumference of the electrode assembly 13, so that the high-temperature resistant insulating component 16 can play a more stable and reliable insulating separation role between the tab 132 and the inner wall of the receiving cavity 101. This further reduces the probability of short circuit between the tab 132 and the first side wall 1111 or the inner wall of the receiving cavity 101 in the battery cell 10 under high temperature environment, thereby improving the operational stability and reliability of the battery cell 10.

[0140] In some embodiments of this application, reference is made to Figure 3 and Figure 8 As shown, the electrode 132 is in the second direction (e.g.) Figure 3 The dimension shown in the y-direction can be the first dimension, and the dimension of the high-temperature resistant insulating component 16 in the second direction can be the second dimension, which is larger than the first dimension. The second direction is the length direction of the battery cell 10.

[0141] In the embodiment, the dimension of the tab 132 in the length direction of the battery monomer 10 is set as a first dimension, and the dimension of the high-temperature-resistant insulating piece 16 in the length direction of the battery monomer 10 is set as a second dimension, the second dimension is greater than the first dimension, and the second direction is the direction perpendicular to the length direction of the battery monomer 10. Figure 8 As shown in the figure, L1 represents the first dimension, and L2 represents the second dimension, and L2 is greater than L1. In the length direction of the battery monomer 10, at least one end of the high-temperature-resistant insulating piece 16 exceeds the tab 132.

[0142] In the embodiment, the second dimension of the high-temperature-resistant insulating piece 16 is greater than the first dimension of the tab 132, so that the high-temperature-resistant insulating piece 16 can completely cover the extension range of the tab 132 in the second direction stably and reliably, thereby making the high-temperature-resistant insulating piece 16 play a role of insulating and separating the tab 132 and the first side wall 1111 stably and reliably, and making the part of the high-temperature-resistant insulating piece 16 exceeding the tab 132 in the second direction compensate for the assembly error when the high-temperature-resistant insulating piece 16 is arranged in cooperation with the tab 132, so that the high-temperature-resistant insulating piece 16 has a lower assembly arrangement precision with the tab 132 in the second direction under the condition that the high-temperature-resistant insulating piece 16 completely covers the extension range of the tab 132 in the second direction to reliably insulate, and the arrangement and assembly of the high-temperature-resistant insulating piece 16 are more convenient and easy.

[0143] In an embodiment of the present application, as shown in Figure 7 In the second direction, both ends of the high-temperature-resistant insulating piece 16 can exceed both ends of the tab 132, respectively.

[0144] In the embodiment, both ends of the high-temperature-resistant insulating piece 16 exceed both ends of the tab 132, respectively. Exemplarily, in the second direction, one end of the high-temperature-resistant insulating piece 16 and one end of the tab 132 are on the same side, one end of the high-temperature-resistant insulating piece 16 is away from one end of the tab 132 and away from the tab 132, and the dimensions of the parts of both ends of the high-temperature-resistant insulating piece 16 exceeding both ends of the tab 132 can be the same or different.

[0145] In the embodiment, both ends of the high-temperature-resistant insulating piece 16 are arranged to exceed both ends of the tab 132 in the second direction, respectively, which is simple in structure and convenient for adjusting and arranging the relative positions of the high-temperature-resistant insulating piece 16 and the tab 132 in the battery monomer 10, so that the high-temperature-resistant piece can be arranged more conveniently under the condition of reliably insulating and separating the tab 132 and the first side wall 1111.

[0146] In an embodiment of the present application, as shown in Figure 7 In the second direction, the dimension of the part of any one end of the high-temperature-resistant insulating piece 16 exceeding the tab 132 in the second direction can be greater than or equal to 1 mm.

[0147] In this embodiment, the portion of any end of the high-temperature resistant insulating component 16 that extends beyond the tab 132 has a dimension greater than or equal to 1 mm in the second direction. (Refer to...) Figure 7 As shown in the figure, ΔL represents the dimension by which the high-temperature resistant insulating component 16 extends beyond the tab 132 at any end in the second direction. ΔL can be 1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 3mm, 5mm, etc.

[0148] In this embodiment, the dimension of the portion of any end of the high-temperature resistant insulating component 16 that extends beyond the tab 132 in the second direction is set to be greater than or equal to 1 mm. This ensures that the portion of any end of the high-temperature resistant insulating component 16 that extends beyond the tab 132 has sufficient dimension, so that the high-temperature resistant insulating component 16 can stably cover the extension range of the tab 132 in the second direction even with certain assembly errors. This reduces the assembly precision requirement of the high-temperature resistant insulating component 16 and allows it to be conveniently assembled and arranged in the battery cell 10.

[0149] In some embodiments of this application, reference is made to Figure 3 and Figure 6 As shown, the electrode 132 is in a third direction (such as...) Figure 3 The dimension shown in the z-direction can be the third dimension, and the dimension of the high-temperature resistant insulating component 16 in the third direction can be the fourth dimension. The fourth dimension is larger than the third dimension, and the third direction is the height direction of the battery cell 10.

[0150] In this embodiment, the tab 132 has a third dimension in the height direction of the battery cell 10, and the high-temperature resistant insulating component 16 has a fourth dimension in the height direction of the battery cell 10. The fourth dimension is larger than the third dimension. (Refer to...) Figure 6 As shown in the figure, h1 represents the third dimension and h2 represents the fourth dimension. Therefore, h2 is greater than h1. The high-temperature resistant insulating component 16 extends beyond the tab 132 at at least one end in the third direction.

[0151] In this embodiment, the fourth dimension of the high-temperature resistant insulating component 16 is larger than the third dimension of the tab 132, so that the high-temperature resistant insulating component 16 can reliably and stably cover the extension range of the tab 132 in the third direction. This allows the high-temperature resistant insulating component 16 to reliably and stably provide insulation separation between the tab 132 and the first sidewall 1111. Furthermore, when the high-temperature resistant insulating component 16 is assembled and arranged within the battery cell 10, the portion of the high-temperature resistant insulating component 16 extending beyond the tab 132 in the third direction can compensate for assembly errors when the high-temperature resistant insulating component 16 and the tab 132 are arranged together. This ensures that the high-temperature resistant insulating component 16 completely covers the extension range of the tab 132 in the third direction for reliable insulation, while the assembly and arrangement accuracy of the high-temperature resistant insulating component 16 and the tab 132 is low, making the arrangement and assembly of the high-temperature resistant insulating component 16 more convenient and easier.

[0152] In one embodiment of the present application, referring to Figure 6 In the third direction, the two ends of the high-temperature-resistant insulating member 16 can respectively exceed the two ends of the tab 132.

[0153] In the embodiment, the two ends of the high-temperature-resistant insulating member 16 respectively exceed the two ends of the tab 132. Exemplarily, in the third direction, the one end of the high-temperature-resistant insulating member 16 and the one end of the tab 132 on the same side, the one end of the high-temperature-resistant insulating member 16 away from the one end of the tab 132 and away from the tab 132, the sizes of the portions of the two ends of the high-temperature-resistant insulating member 16 exceeding the two ends of the tab 132 can be the same or different.

[0154] In the embodiment, the two ends of the high-temperature-resistant insulating member 16 in the third direction are respectively set to exceed the two ends of the tab 132, which is simple in structure and facilitates the adjustment and arrangement of the relative positions of the high-temperature-resistant insulating member 16 and the tab 132 in the battery monomer 10, so that the high-temperature-resistant member can be arranged more conveniently while meeting the reliable insulating separation of the tab 132 and the first side wall 1111.

[0155] In some examples of the present application, referring to Figure 6 In the third direction, the sizes of the portions of any one end of the high-temperature-resistant insulating member 16 exceeding the tab 132 can all be greater than or equal to 1 mm.

[0156] In the embodiment, the sizes of the portions of any one end of the high-temperature-resistant insulating member 16 exceeding the tab 132 in the third direction are greater than or equal to 1 mm. Referring to Figure 6 In the embodiment, the sizes of the portions of any one end of the high-temperature-resistant insulating member 16 exceeding the tab 132 in the third direction are greater than or equal to 1 mm. Referring to

[0157] In the embodiment, the sizes of the portions of any one end of the high-temperature-resistant insulating member 16 exceeding the tab 132 in the third direction are greater than or equal to 1 mm. Referring to

[0158] In some embodiments of the present application, as Figure 3 and Figure 4As shown, the shell 11 can include a main shell 111 and an end cover 112, the main shell 111 is provided with a receiving groove, the receiving groove is open at least one end in the third direction, the two side walls of the main shell 111 in the first direction are the first side wall 1111; the end cover 112 covers the open end of the receiving groove, and the tab 132 is arranged at one end of the pole group body 131 in the third direction facing the open end, and the third direction intersects the first direction.

[0159] In this embodiment, the shell 11 includes a main shell 111 and an end cover 112, the main shell 111 is provided with a receiving groove, the electrode assembly 13, the first insulating piece 14 and the high-temperature-resistant insulating piece 16 can be arranged in the receiving groove, the receiving groove is open at least one end in the third direction, for example, the receiving groove can be open at one end in the third direction, or the receiving groove can be open at both ends in the third direction, and the end cover 112 covers the open end of the receiving groove and cooperates with the main shell 111 to form a sealed receiving cavity 101, when the battery monomer 10 is assembled, the electrode assembly 13, the first insulating piece 14 and the like can be assembled into the receiving groove from the open end, and after the end cover 112 closes the receiving groove, the electrode assembly 13 and the like can be in the sealed receiving cavity 101.

[0160] The two side walls of the main shell 111 in the first direction are formed as the first side wall 1111, and the main shell 111 can be cuboid-shaped, for example. The tab 132 of the electrode assembly 13 is arranged at one end of the pole group body 131 in the third direction facing the open end, that is, the tab 132 is arranged at one end of the electrode assembly 13 in the third direction facing the end cover 112, and the electrode assembly 13 can also be provided with a jumper 12, and the end cover 112 can be provided with a pole post, and the tab 132 is electrically connected to the pole post through the jumper 12 to meet the use needs of the battery monomer 10.

[0161] The number of electrode assemblies 13 in the battery monomer 10 can be one or more as needed, and the number of tabs 132 can also be correspondingly arranged, for example, when the electrode assembly 13 is one, the number of tabs 132 can be two, four or the like to meet the needs of the arrangement position of the tab 132 or provide current distribution uniformity, and the multiple tabs 132 include positive tabs and negative tabs, the multiple positive tabs can be connected to the corresponding positive pole post through the jumper 12, and the multiple negative tabs can be connected to the corresponding negative pole post through the jumper 12, or the number of electrode assemblies 13 can be multiple, for example, the number of electrode assemblies 13 is two, and each electrode assembly 13 can form two tabs 132, the positive tabs of the two electrode assemblies 13 are connected to the positive pole post through the jumper 12, and the negative tabs of the two electrode assemblies 13 are connected to the negative pole post through the jumper 12, and in this embodiment, the number of electrode assemblies 13 and the number of tabs 132 in the battery monomer 10 are not specifically limited, and can meet the design and use needs of the battery monomer 10 and the like.

[0162] In the embodiment, the third direction intersects the first direction, which is intended to indicate that the third direction and the first direction can be arranged perpendicularly, or can be arranged only intersecting, that is, arranged intersecting at an acute angle or an obtuse angle, for example, the third direction and the first direction can be arranged at an angle of 30°, 60°, 80°, 120°, 150° or 170°.

[0163] In the embodiment, the shell 11 includes a main shell 111 and an end cover 112, the end cover 112 covers the open end of the accommodating groove of the main shell 111, which is simple in structure and facilitates the assembly of the battery monomer 10, the tab 132 is arranged at one end of the pole group body 131 facing the open end in the third direction, facilitating the connection of the tab 132 with the pole column and the like on the end cover 112, and meeting the use needs of the battery monomer 10.

[0164] In an embodiment of the present application, referring to Figure 6 and Figure 11 As shown, in the third direction, the distance between the side edge of the high-temperature-resistant insulating piece 16 facing the open end and the end edge of the end of the main shell 111 facing the end cover 112 can be greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0165] In the embodiment, the distance between the side edge of the high-temperature-resistant insulating piece 16 facing the open end and the end edge of the end of the main shell 111 facing the end cover 112 is greater than or equal to 0.5 mm and less than or equal to 2 mm, referring to Figure 6 and Figure 11 As shown, h3 represents the distance between the side edge of the high-temperature-resistant insulating piece 16 facing the open end and the end edge of the end of the main shell 111 facing the end cover 112 in the third direction, and h3 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.9 mm, 1 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0166] It can be understood that when the end cover 112 is assembled with the main shell 111, the end cover 112 needs to cooperate with the edge of the open end of the main shell 111 and be welded and fixed for sealing operation, and the edge of the open end is the end edge of the end of the main shell 111 facing the end cover 112, so the size structure of the main shell 111 at the end edge needs to maintain a good cooperation relationship with the end cover 112. Since the high-temperature-resistant insulating piece 16 has a certain thickness, when the high-temperature-resistant insulating piece 16 is too close to the end edge of the main shell 111, the high-temperature-resistant insulating piece 16 will hinder the assembly and fixation of the end cover 112 and the main shell 111.

[0167] In the embodiment, the distance between the side edge of the high-temperature-resistant insulating member 16 on the side facing the opening in the third direction and the end edge of the main shell 111 on the side facing the end cover 112 is greater than or equal to 0.5 mm, so that the high-temperature-resistant insulating member 16 has sufficient distance from the end edge of the main shell 111 to facilitate the welding of the end cover 112 and the main shell 111, so that the battery cell 10 can be stably assembled. The distance between the side edge of the high-temperature-resistant insulating member 16 on the side facing the opening in the third direction and the end edge of the main shell 111 on the side facing the end cover 112 is less than or equal to 2 mm, so that the high-temperature-resistant insulating member 16 can be more conveniently arranged on the first side wall 1111, and the relative position of the high-temperature-resistant insulating member 16 in the third direction to the tab 132 meets the insulation requirement of the tab 132 to the shell 11.

[0168] In an embodiment of the present application, referring to Figure 6 and Figure 7 , the plurality of tabs 132 are arranged at intervals in the second direction and are arranged on both sides of the end of the pole group body 131 in the first direction. The tab 132 includes a connecting portion and an electrical connection portion. One end of the connecting portion is connected to the pole group body 131, and the other end of the connecting portion extends obliquely in the first direction away from the high-temperature-resistant insulating member 16 in the direction from the pole group body 131 to the end cover 112, and the other end of the connecting portion is connected to the electrical connection portion.

[0169] In the embodiment, the plurality of tabs 132 are arranged at intervals in the length direction of the battery cell 10 and are arranged on both sides of the first direction, for example Figure 7 , as shown in the figure, the electrode assembly 13 can be two, each electrode assembly 13 is provided with two tabs 132, and the four tabs 132 are arranged in two groups, the two groups of tabs 132 are arranged at intervals in the length direction of the battery cell 10, in each group of tabs 132, the two tabs 132 are arranged at intervals in the thickness direction of the battery cell 10, and the tabs 132 are formed at positions close to the edges of the pole body, the tabs 132 are located at positions close to the first side wall 1111 of the electrode assembly 13 in the thickness direction of the battery cell 10, and the adapter plate 12 can be connected to the two tabs 132 in each group of tabs 132.

[0170] The tab 132 includes a connecting portion and an electrical connection portion. The connecting portion is connected to the pole group body 131 and the electrical connection portion. The connecting portion extends obliquely away from the high-temperature-resistant insulating member 16 in the first direction. The electrical connection portion is located on the side of the connecting portion away from the high-temperature-resistant insulating member 16 in the first direction. The adapter piece 12 is connected to the electrical connection portion. The electrical connection portion can be formed with a recessed avoiding groove facing the pole group body 131. Part of the adapter piece 12 is located in the avoiding groove and connected to the electrical connection portion. The overall structure of the adapter piece 12 and the tab 132 in the third direction is reduced. The part of the connecting portion facing the side surface of the first side wall 1111 can be formed as an arc surface to form a relatively gentle connecting structure with the electrical connection portion, reduce stress, and improve the overall structural strength of the tab 132.

[0171] In the embodiment, the tab 132 is provided with the connecting portion and the electrical connection portion. One end of the connecting portion is connected to the pole group body 131, and the other end extends obliquely away from the high-temperature-resistant insulating member 16 in the first direction from the pole group body 131 to the end cover 112. The other end of the connecting portion is connected to the electrical connection portion. The structure is simple, the distance between the tab 132 and the high-temperature-resistant insulating member 16 in the first direction can be increased, and the lap contact probability of the tab 132 and the first side wall 1111 provided with the high-temperature-resistant insulating member 16 can be reduced to a certain extent. The risk of short circuit of the tab 132 and the first side wall 1111 is reduced, and the battery monomer 10 is more stable and reliable during operation.

[0172] In some embodiments of the present application, as shown in Figure 3 and Figure 5 The battery monomer 10 can also be provided with a second insulating member 15. The second insulating member 15 is arranged in the accommodating cavity 101 and between the electrode assembly 13 and the bottom wall of the accommodating cavity 101 in the third direction.

[0173] The second insulating member 15 can be an insulating sheet or an insulating plate. The second insulating member 15 can completely cover the end surface of the electrode assembly 13 in the third direction. The first insulating member 14 and the second insulating member 15 can cooperate to cover the circumferential outer side and the bottom of the electrode assembly 13. The heat-resistant temperature of the second insulating member 15 can be the same as that of the first insulating member 14. The material of the second insulating member 15 can also be the same as that of the first insulating member 14.

[0174] In the embodiment, the second insulating member 15 is arranged between the electrode assembly 13 and the bottom wall of the accommodating cavity 101. The electrode assembly 13 and the bottom wall of the accommodating cavity 101 in the third direction are insulated and separated by the second insulating member 15. The risk of short circuit between the electrode assembly 13 and the shell 11 is reduced by one step. The probability of thermal runaway of the battery monomer 10 caused by short circuit between the electrode assembly 13 and the shell 11 is reduced. The battery monomer 10 can operate more stably and reliably.

[0175] The following will be describedFigures 2-11 A battery device 100 according to an embodiment of the second aspect of the present application is described.

[0176] As shown in Figures 2-11 A battery device 100 according to an embodiment of the present application includes the battery cell 10 according to the first aspect of the present application.

[0177] Other configurations and operations of the battery device 100 according to the embodiments of the present application are known to those skilled in the art and will not be described in detail here.

[0178] According to the battery device 100 according to the embodiments of the present application, by arranging the battery cell 10 of the above-mentioned first aspect embodiment, by arranging the high-temperature-resistant insulating member 16 between the first side wall 1111 and the tab 132, the heat-resistant temperature of the high-temperature-resistant insulating member 16 is greater than the heat-resistant temperature of the first insulating member 14, so that when the battery device 100 occurs thermal runaway, the high-temperature-resistant insulating member 16 can play a good insulation effect on the tab 132 and the first side wall 1111 in the battery cell 10, reducing the risk of short circuit of the tab 132 and the first side wall 1111, thereby reducing the probability of thermal runaway of the battery cell 10 in a high-temperature environment, and further slowing down the thermal runaway in the battery device 100, and greatly reducing the risk of fire and explosion of the battery device 100.

[0179] The following refers to Figures 1-11 A power storage device according to an embodiment of the third aspect of the present application is described.

[0180] As shown in Figures 1-11 A power storage device according to an embodiment of the present application includes a plurality of battery cells 10 according to the first aspect of the present application or a plurality of battery devices 100 according to the second aspect of the present application, and the battery cells 10 or the battery devices 100 are used to store or provide electrical energy.

[0181] Other configurations and operations of the power storage device according to the embodiments of the present application are known to those skilled in the art and will not be described in detail here.

[0182] According to the energy storage device provided in the embodiments of the present application, by arranging the battery monomer 10 of the first aspect or the battery device 100 of the second aspect, the high-temperature-resistant insulation piece 16 is arranged between the first side wall 1111 and the tab 132, the heat-resistant temperature of the high-temperature-resistant insulation piece 16 is greater than that of the first insulation piece 14, when the battery device 100 is in thermal runaway, the high-temperature-resistant insulation piece 16 can stably and well insulate the tab 132 in the battery monomer 10 from the first side wall 1111, so that the risk of short circuit of the tab 132 and the first side wall 1111 is reduced, thereby reducing the probability of thermal runaway of the battery monomer 10 in a high-temperature environment, further slowing down the thermal runaway in the battery device 100, and well reducing the risk of fire and explosion of the battery device 100.

[0183] The energy storage device 1000 according to the embodiments of the present application will be described below. Figures 1-11 The energy storage device 1000 according to the embodiments of the present application will be described below.

[0184] As shown in Figures 1-11 The energy storage device 1000 according to the embodiments of the present application includes the battery monomer 10 of the first aspect or the battery device 100 of the second aspect or the energy storage device of the third aspect, and the battery monomer 10 or the battery device 100 is used for storing or providing electric energy.

[0185] The other configurations and operations of the energy storage device 1000 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0186] The energy storage device 1000 according to the embodiments of the present application includes the battery monomer 10 of the first aspect or the battery device 100 of the second aspect or the energy storage device of the third aspect, and the battery monomer 10 or the battery device 100 is used for storing or providing electric energy.

[0187] The energy storage device 1000 according to the embodiments of the present application will be described below. Figures 1-11 The energy storage device 1000 according to the embodiments of the present application will be described below.

[0188] As shown in Figures 1-11As shown, the power utilization device 1000 is a vehicle, and the power utilization device 1000 includes a motor 200, a battery device 100, and a controller 300, which is configured to control the battery device 100 to supply power to the motor 200.

[0189] The battery device 100 includes a box body and a plurality of battery cells 10 arranged in the box body. The battery cell 10 is a square battery cell 10, which includes a shell 11, an electrode assembly 13, a tab 12, a first insulating member 14, a second insulating member 15, and a high-temperature-resistant insulating member 16. The shell 11 includes a main shell 111 and an end cover 112. The main shell 111 can be an aluminum shell, which is provided with a receiving groove open on one side in the third direction. The end cover 112 covers the opening of the receiving groove and cooperates with the main shell 111 to define a receiving cavity 101. The two side walls of the main shell 111 in the first direction are respectively formed as first side walls 1111. The end cover 112 can be provided with structural components such as a pole, an upper plastic, a lower plastic, and an explosion-proof valve.

[0190] The second insulating member 15 is an insulating plate arranged in the receiving cavity 101 and located at the bottom of the receiving cavity 101. The electrode assembly 13 is provided with two electrode assemblies arranged in a stacked manner in the first direction and arranged in the receiving cavity 101. The second insulating member 15 serves to insulate and separate the electrode assembly 13 from the bottom wall of the main shell 111 and cooperates with the main shell 111 to support the electrode assembly 13. The first insulating member 14 is arranged in the receiving cavity 101 and sleeved on the two electrode assemblies 13. The first insulating member 14 can be a rectangular frame structure surrounding the electrode assembly 13 formed by bending an insulating sheet in a direction. The first insulating member 14 separates the electrode assembly 13 from the side wall of the main shell 111 in the circumferential direction of the electrode assembly 13.

[0191] The electrode assembly 13 includes a tab 132 and a pole body 131. The tab 132 is arranged at one end of the pole body 131 facing the end cover 112 in the third direction. The number of tabs 132 is four, and the four tabs 132 are arranged in two groups. The two groups of tabs 132 are arranged in the second direction, and the two tabs 132 in each group are arranged in the first direction. The number of poles is two, and the two tabs 12 are connected to the two poles and the two groups of tabs 132.

[0192] The number of high-temperature-resistant insulating members 16 is four. Two high-temperature-resistant insulating members 16 are arranged on each of the two first side walls 1111. The high-temperature-resistant insulating member 16 is a polyimide adhesive paper. In the first direction, the high-temperature-resistant insulating member 16 is located between the first side wall 1111 and the tab 132.

[0193] The battery monomer 10 of the first aspect or the battery device 100 of the second aspect or the energy storage device of the third aspect is arranged, a high-temperature-resistant insulating piece 16 is arranged between the first side wall 1111 and the tab 132, the heat-resistant temperature of the high-temperature-resistant insulating piece 16 is greater than the heat-resistant temperature of the first insulating piece 14, when the battery device 100 appears thermal runaway, the high-temperature-resistant insulating piece 16 can play a good insulation effect on the tab 132 and the first side wall 1111 in the battery monomer 10, so that the risk of short circuit of the tab 132 and the first side wall 1111 is reduced, thereby reducing the probability of thermal runaway of the battery monomer 10 in a high-temperature environment, and further slowing down the thermal runaway in the battery device 100, and well reducing the risk of fire and explosion of the battery device 100.

[0194] In other embodiments of the present application, the high-temperature-resistant insulating piece 16 can also be a high-temperature-resistant insulating coating or an oxidation layer, the battery monomer 10 can be a cylindrical battery monomer 10, the two first side walls 1111 correspond to the complete annular inner wall of the shell 11, and the high-temperature-resistant insulating piece 16 can also extend along the circumference of the electrode assembly 13 to form an annular structure, and the like.

[0195] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery cell, which comprises: a shell (11) having a containing cavity (101), the shell (11) having two first side walls (1111) oppositely arranged in a first direction, the first direction being the thickness direction of the battery cell; an electrode assembly (13) arranged in the containing cavity (101), the electrode assembly (13) comprising an electrode group body (131) and a tab (132) connected with the electrode group body (131); a first insulating member (14) extending in a ring shape along the circumference of the electrode assembly (13), the first insulating member (14) being sleeved on the outer side of the electrode assembly (13); a high-temperature-resistant insulating member (16) arranged between the first side wall (1111) and the tab (132), the high-temperature-resistant insulating member (16) having a heat-resistant temperature greater than that of the first insulating member (14).

2. The battery cell of claim 1, wherein, The heat-resistant temperature of the high-temperature-resistant insulating member (16) is greater than or equal to 200 DEG C.

3. The battery cell of claim 2, wherein, The heat-resistant temperature of the high-temperature-resistant insulating member (16) is greater than or equal to 400 DEG C.

4. The battery cell of claim 1, wherein, In a projection plane perpendicular to the first direction, the projection of the tab (132) is completely within the projection range of the high-temperature-resistant insulating member (16).

5. The battery cell of claim 1, wherein, The high-temperature-resistant insulating member (16) is insulating adhesive paper.

6. The battery cell of claim 5, wherein, The thickness of the high-temperature-resistant insulating member (16) is greater than or equal to 0.05 mm.

7. The battery cell of claim 1, wherein, The high-temperature-resistant insulating member (16) is an insulating coating coated on the first side wall (1111).

8. The battery cell of claim 7, wherein, The thickness of the insulating coating is greater than or equal to 0.01 mm and less than or equal to 0.015 mm.

9. The battery cell of claim 1, wherein, The high-temperature-resistant insulating member (16) is an insulating oxide layer formed on the first side wall (1111).

10. The battery cell of claim 9, wherein, The thickness of the insulating oxide layer is greater than or equal to 0.1 mm and less than or equal to 0.12 mm.

11. The battery cell of any one of claims 1-10, wherein, The high-temperature-resistant insulating member (16) extends in a ring shape along the circumference of the electrode assembly (13).

12. The battery cell of any one of claims 1-10, wherein, The size of the tab (132) in a second direction is a first size, the size of the high-temperature-resistant insulating member (16) in the second direction is a second size, the second size is greater than the first size, and the second direction is the length direction of the battery cell.

13. The battery cell of claim 12, wherein, In the second direction, the two ends of the high-temperature-resistant insulating member (16) respectively exceed the two ends of the tab (132).

14. The battery cell of claim 12, wherein, In the second direction, the size of the part of the high-temperature-resistant insulating member (16) exceeding the tab (132) at any end is greater than or equal to 1 mm.

15. The battery cell of any one of claims 1-10, wherein, The size of the tab (132) in a third direction is a third size, the size of the high-temperature-resistant insulating member (16) in the third direction is a fourth size, the fourth size is greater than the third size, and the third direction is the height direction of the battery cell.

16. The battery cell of claim 15, wherein, In the third direction, the two ends of the high-temperature-resistant insulating member (16) respectively exceed the two ends of the tab (132).

17. The battery cell of claim 16, wherein, In the third direction, the dimension of the part of the high-temperature-resistant insulating member (16) beyond the tab (132) at either end in the third direction is greater than or equal to 1 mm.

18. The battery cell of any one of claims 1-10, wherein, The housing (11) comprises: a main shell (111) provided with a receiving groove open at at least one end in a third direction, two side walls of the main shell (111) in the first direction being the first side walls (1111); an end cover (112) covering the open end of the receiving groove, the tab (132) being provided at an end of the pole group body (131) in the third direction facing the open end, the third direction intersecting the first direction.

19. The battery cell of claim 18, wherein, In the third direction, the distance between the side edge of the high-temperature-resistant insulating member (16) facing the open end and the end edge of the main shell (111) facing the end cover (112) is greater than or equal to 0.5 mm and less than or equal to 2 mm.

20. A battery device (100) characterized by A battery cell according to any one of claims 1-19.

21. An energy storage device, comprising: A plurality of battery cells according to any one of claims 1-19 or a plurality of battery devices (100) as claimed in claim 20 for storing or providing electrical energy.

22. An electrical device, comprising: A battery cell according to any one of claims 1-19, a battery device (100) as claimed in claim 20 or an energy storage device as claimed in claim 21 for storing or providing electrical energy. A battery cell according to any one of claims 1-19, a battery device (100) as claimed in claim 20 or an energy storage device as claimed in claim 21 for storing or providing electrical energy.

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