Battery, electrical device and energy storage apparatus

Abstract

A battery (100), an electrical device and an energy storage apparatus. The battery (100) comprises several battery cells (20), a metal strap (10) and an insulating component (30), wherein each battery cell (20) comprises a metal casing (21); the metal strap (10) is wound around the several battery cells (20) for binding the several battery cells; the insulating component (30) is connected to the battery cells (20) or the metal strap (10), and the insulating component (30) is at least partially located between the battery cells (20) and the metal strap (10); and the insulation resistance value between the metal strap (10) and each metal casing (21) is greater than or equal to A*B*1000 Ohms, A being the nominal voltage of each battery cell (20) and having a unit of V, and B being the number of battery cells (20) which are connected in series and having a unit of piece.

Description

Batteries, electrical equipment and energy storage devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420390717.0 and application date of February 29, 2024, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the technical field of energy storage and power batteries, and in particular to a battery, electrical equipment and energy storage device. Background Art

[0004] Metal straps are often used during battery assembly to enhance structural stability, secure the battery, and absorb expansion.

[0005] In related technologies, in order to protect the battery cells in the battery, an insulating coating is usually applied to the surface of the metal strap and / or the surface of the battery cell shell. When the battery is in thermal runaway, the insulating coating is prone to insulation failure, resulting in insulation failure between the metal strap and the battery cell. Summary of the Invention

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, one object of the present invention is to provide a battery.

[0008] Another object of the present invention is to provide an electrical device.

[0009] Another object of the present invention is to provide an energy storage device.

[0010] In a first aspect, the present application provides a battery comprising a plurality of battery cells, a metal strap and an insulating component; the plurality of battery cells are arranged side by side, and each battery cell comprises a metal shell; the metal strap is passed around the plurality of battery cells for binding the plurality of battery cells together; the insulating component is connected to the battery cell and / or the metal strap, and the insulating component is at least partially located between the battery cell and the metal strap; the insulation resistance between the metal strap and each metal shell is greater than or equal to A*B*1000 ohms, where A is the nominal voltage of the battery cell, in V; and B is the number of battery cells connected in series, in pieces.

[0011] According to the battery of the present application, an independent insulating component is provided to connect the insulating component to the battery cell or the metal strap, and at least a portion of the insulating component is located between the battery cell and the metal strap, thereby protecting the battery cell; wherein, the insulation resistance between the metal strap and each metal shell is greater than or equal to A*B*1000 ohms. Therefore, when the battery is in thermal runaway, the insulation resistance between the metal strap and the metal shell can also be maintained in a range greater than or equal to A*B*1000 ohms, so that there will be no insulation failure between the metal strap and the battery cell when the battery is in thermal runaway.

[0012] In a second aspect, the present application provides an electrical device comprising the above-mentioned battery.

[0013] In a third aspect, the present application provides an energy storage device comprising the above-mentioned battery.

[0014] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is an exploded view of a portion of the structure of an embodiment of a battery of the present application;

[0016] FIG2 is a side view of an embodiment of a battery of the present application;

[0017] FIG3 is a partial structural diagram of another embodiment of the battery of the present application;

[0018] FIG4 is a side view of another embodiment of the battery of the present application;

[0019] FIG5 is a schematic structural diagram of another embodiment of the battery of the present application;

[0020] FIG6 is a partial structural diagram of another embodiment of the battery of the present application;

[0021] FIG7 is a partial structural diagram of another embodiment of the battery of the present application;

[0022] FIG8 is a schematic diagram of the structure of the metal binding tape and the insulating substrate of the present application;

[0023] FIG9 is a schematic diagram of the structure of the metal strap in the present application in conjunction with the isolation layer and the coating;

[0024] FIG10 is a schematic diagram of the structure of the metal binding tape in the present application in cooperation with the isolation layer and the insulating tape;

[0025] FIG11 is a schematic diagram of the structure of the metal binding tape and the insulating tape of the present application;

[0026] FIG12 is a schematic diagram of the structure of the metal strap and the coating of the present application;

[0027] FIG13 is a schematic diagram of an exploded structure of another embodiment of a battery of the present application;

[0028] FIG14 is a schematic structural diagram of an embodiment of an electrical device of the present application;

[0029] FIG15 is a schematic structural diagram of the present application when using an insulation withstand voltage test device to perform an insulation resistance test. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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 this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0032] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0033] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may 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 does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] Batteries mentioned in this field can be categorized as either disposable or rechargeable, depending on whether they are rechargeable. Common rechargeable battery types include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries are widely used in pure electric and hybrid vehicles. While these batteries have a relatively low capacity, they offer high output, high charging current, and a long service life, albeit at a relatively high cost.

[0038] The batteries described in the embodiments of this application are rechargeable batteries. The following description of the embodiments disclosed herein primarily uses lithium-ion batteries as an example. It should be understood that the embodiments disclosed herein are applicable to any other appropriate type of rechargeable battery. The batteries described in the embodiments disclosed herein can be directly or indirectly used in appropriate devices to power such devices.

[0039] The battery mentioned in the embodiments disclosed in this application refers to a single physical module that includes one or more battery cells to provide a predetermined voltage and capacity. Battery cells are the basic units in a battery and can generally be divided into cylindrical battery cells, rectangular battery cells, and soft-pack battery cells according to the packaging method. The following will mainly focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0040] A battery cell consists of a positive electrode sheet, a negative electrode sheet, an electrolyte, and a separator. Lithium-ion battery cells primarily rely on the movement of lithium ions between the positive and negative electrode sheets. In cylindrical battery cells, a three-layer film structure is wound into a cylindrical electrode assembly, while in rectangular battery cells, the film structure is wound or stacked into a roughly rectangular electrode assembly.

[0041] In a typical battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The electrode assembly is housed in the battery cell housing and includes a positive electrode sheet, a negative electrode sheet, and a separator. The housing includes a bottom shell and end caps. The bottom shell includes a housing cavity formed by multiple walls and an opening. The end caps are arranged at the opening to seal the housing cavity. In addition to the electrode assembly, the housing cavity also contains electrolyte. The positive and negative electrode sheets in the electrode assembly include tabs. To improve the ability to pass high currents without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The tabs are electrically connected to electrode terminals located outside the battery cell via connecting members. The electrode terminals generally include positive and negative electrode terminals. For rectangular battery cells, the electrode terminals are generally located on the end caps. Multiple battery cells are connected in series and / or in parallel via the electrode terminals for various applications.

[0042] In high-power applications such as electric vehicles, battery applications encompass three levels: cells, modules, and batteries. A battery module is a system of electrically connected cells housed in a frame to protect the cells from external shock, heat, and vibration. A battery is the final battery system installed in an electric vehicle. It typically consists of a housing that encloses one or more cells.

[0043] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and crucial role. A battery consists of a housing and multiple cells contained within it. As a core component of new energy vehicles, batteries have high safety requirements. Currently, the mechanical safety of power batteries during use is a common concern for consumers.

[0044] The battery provided in the embodiments of the present application can be a power source for electrical devices. Electrical devices may include mobile phones, portable devices, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys, and electric tools. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0045] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0046] For example, FIG9 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle. A battery 100, a controller 200, and a motor 300 may be disposed within the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be disposed at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000 and may be used for the circuit system of the vehicle 1000, such as for starting, navigation, and operating the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0047] For example, please refer to Figure 8. Figure 5 is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 11 and a battery cell 20. The housing 11 has a storage space for accommodating the battery cell 20. The housing 11 can adopt a variety of structures. In some embodiments, the housing 11 can include a first part 10a and a second part 10b. The first part 10a and the second part 10b cover each other, and the first part 10a and the second part 10b jointly define a storage space for accommodating the battery cell 20. The second part 10b can be a hollow structure with one end open, and the first part 10a can be a plate-like structure. The first part 10a covers the open side of the second part 10b, so that the first part 10a and the second part 10b jointly define a storage space; the first part 10a and the second part 10b can also be hollow structures with one side open, and the open side of the first part 10a covers the open side of the second part 10b. Of course, the housing 11 formed by the first part 10a and the second part 10b can be in various shapes, such as a cylinder, a cuboid, etc.

[0048] In the battery 100, there can be one or more battery cells 20. When the battery 100 has multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the case 11; of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the case 11. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for achieving electrical connection between the multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 can be further led out through the box body 11 via a conductive mechanism. Optionally, the conductive mechanism can also be a busbar component.

[0049] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0050] Metal straps are often used during battery assembly to enhance structural stability, secure the battery, and absorb expansion.

[0051] In related technologies, in order to protect the battery cells in the battery, an insulating coating is usually applied to the surface of the metal strap and / or the surface of the battery cell shell. When the battery is in thermal runaway, gaps are easily formed in the insulating coating, resulting in insulation failure between the metal strap and the battery cell.

[0052] In view of this, in combination with reference to Figures 1 to 12, the present application provides a battery 100, including a plurality of battery cells 20, a metal strap 10 and an insulating component 30; the plurality of battery cells 20 are arranged side by side, and each battery cell 20 includes a metal shell 21; the metal strap 10 is passed around the plurality of battery cells 20 to bind the plurality of battery cells 20; the insulating component 30 is connected to the battery cell 20 and / or the metal strap 10, and the insulating component 30 is at least partially located between the battery cell 20 and the metal strap 10; the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*1000 ohms, where A is the nominal voltage of the battery cell 20, in V; and B is the number of battery cells 20 connected in series, in pieces.

[0053] In some embodiments, the battery 100 may further include two end plates, with the battery cells 20 disposed between the two end plates. The metal binding straps 10 may include two, with the two metal binding straps 10 disposed on either side of the battery cells 20 and connected to the two end plates, so that the two metal binding straps 10 and the two end plates enclose a fixed loop for binding the battery cells 20. Of course, in other embodiments, a single complete metal binding strap 10 may be directly used to wrap around the battery cells 20 to bind the battery cells 20.

[0054] In actual application, the insulating component 30 can be connected to the battery cell 20 or the metal binding band 10 by means of clamping, winding, bonding, etc., which is not specifically limited here.

[0055] In actual application, the insulating component 30 can be a rigid component or a flexible component, as long as it can be connected to the battery cell 20 or the metal strap 10 to provide insulation protection, and is not specifically limited here.

[0056] In addition, the insulating component 30 is made of insulating material, and the material used is a high-temperature resistant and corrosion-resistant insulating material, for example, it can be sheet film plastic, phenolic film plastic / unsaturated polyester bulk film plastic, epoxy glass fiber board, etc., which can withstand a mechanical force of 7KN without breaking or being damaged.

[0057] Furthermore, the cross-sectional shape of the insulating member 30 may be substantially C-shaped, cross-shaped, U-shaped, or strip-shaped.

[0058] For example, the metal strap 10 may be a steel strap.

[0059] It should be noted that the nominal voltage of the battery cell 20 can be obtained from the specification of the battery 100 or from the nameplate of the battery 100. The number of battery cells 20 connected in series can also be obtained from the specification of the battery 100 or from the nameplate of the battery 100.

[0060] It should be noted that the insulation performance between the metal binding band 10 and the metal housing 21 can be tested by referring to the following steps of GBT 36276-2023:

[0061] a) Connect the positive electrode and exposed conductive parts of the battery 100 that has been initialized and charged to the insulation withstand voltage test device 2000, and turn off the insulation resistance monitoring function of the battery 100;

[0062] b) Apply the test voltage for 5 minutes, record the insulation resistance between the positive electrode and the external exposed conductive part, and the test voltage, and disconnect the insulation withstand voltage test device 2000 from the battery 100;

[0063] c) Connecting the positive electrode and the exposed external guide portion of the battery 100 to the insulation withstand voltage test device 2000;

[0064] d) Apply the test voltage for 5 minutes, record the insulation resistance between the negative electrode and the external exposed conductive part, and the test voltage, disconnect the insulation withstand voltage test device 2000 from the battery 100, and remove the test sample;

[0065] e) Calculate the ratio of the insulation resistance of the positive and negative electrodes to the external exposed conductive parts and the nominal voltage of the battery 100 respectively.

[0066] It should be noted that when conducting the insulation performance test, if an insulation film (such as a blue film) is attached to the surface of the battery cell, the blue film needs to be removed before conducting the insulation performance test.

[0067] It should be noted that the insulation withstand voltage test device 2000 used should have sufficient accuracy and stability, and its accuracy should be one order of magnitude higher than the accuracy of the measured indicator or the error should be less than 1 / 3 of the allowable error of the measured parameter.

[0068] Optionally, the insulation resistance between the metal strap 10 and the battery cell 20 can be ensured to be A*B*1000 ohms, A*B*1200 ohms, A*B*1300 ohms, A*B*1400 ohms, A*B*1500 ohms, etc.

[0069] In the technical solution of the embodiment of the present application, an independent insulating component 30 is provided to connect the insulating component 30 to the battery cell 20 or the metal strap 10, and at least a portion of the insulating component 30 is located between the battery cell 20 and the metal strap 10, thereby protecting the battery cell 20; wherein, the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*1000 ohms. Therefore, when the battery 100 is in thermal runaway, the insulation resistance between the metal strap 10 and the metal shell 21 can also be maintained in a range greater than or equal to A*B*1000 ohms, so that there will be no insulation failure between the metal strap 10 and the battery cell 20 when the battery 100 suffers thermal runaway.

[0070] In addition, since the insulating component 30 is an independent component, the insulating component 30 will not form a gap under the deformation and pulling of the metal shell 21 and the metal strap 10, so that the electrolyte will not adhere to the gap and form creepage. It can also improve the problem of insulation failure between the metal strap 10 and the battery cell 20 during thermal runaway.

[0071] In one embodiment of the present application, after the insulating component 30 is placed at an ambient temperature greater than or equal to 250° C. and less than or equal to 500° C. for 5 minutes, the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*1000 ohms.

[0072] Optionally, the insulation resistance between the metal strap 10 and the battery cell 20 can be ensured to be greater than or equal to A*B*1000 ohms under ambient temperatures of 250° C., 280° C., 300° C., 400° C., 500° C., and the like.

[0073] Specifically, the insulation performance between the metal binding band 10 and the metal shell 21 can be tested by the following method: Referring to FIG. 15 ,

[0074] The insulating component 30 is placed in an environment greater than or equal to 250° C. to 500° C. for 5 minutes;

[0075] Place the insulating component 30 between the metal strap 10 and the battery shell 21 (if there is a blue film on the outside of the metal shell 21, tear it off), use the insulation voltage withstand test device 2000 as the test equipment, electrically connect the positive and negative poles of the insulation voltage withstand test device 2000 to two aluminum blocks respectively, and apply a voltage of 500-1000V / DC for 1 minute to obtain the insulation resistance value.

[0076] Such a design can keep the insulation resistance between the metal strap 10 and the metal shell 21 within a range greater than or equal to A*B*1000 ohms after the insulating component 30 is treated at a temperature of 250°C to 500°C.

[0077] In one embodiment of the present application, the insulating component 30 is made of phenolic film plastic / unsaturated polyester film plastic, epoxy glass fiber, mica, ceramic coating, polytetrafluoroethylene, polyimide, or aerogel. The ceramic coating may be an aluminum oxide ceramic coating, a zirconium oxide ceramic coating, a titanium oxide ceramic coating, a siloxane ceramic, or the like. This design allows the insulating component 30 to be made of a high-temperature resistant material, ensuring that after being treated at a temperature of 250°C to 500°C, the insulating component 30 can still maintain an insulation resistance between the metal strap 10 and the metal shell 21 within a range greater than or equal to A*B*1000 ohms. Therefore, even in the event of thermal runaway of the battery 100, the insulating component 30 can maintain a relatively good insulation effect, thereby reducing the overlap short circuit between the metal shell 21 and the metal strap 10.

[0078] In some embodiments, the insulation performance between the metal binding band 10 and the metal housing 21 can be tested according to the steps of GBT 36276-2023. The results are shown in the following table:

[0079] Table 1

[0080] From the test results in Table 1, we can see that:

[0081] When ethylene-vinyl acetate copolymer is used as the insulating component 30, under the test conditions of an ambient temperature of 250°C and a test time of 5 minutes, the ethylene-vinyl acetate copolymer melts, and the overlap between the metal shell 21 and the metal strap 10 is short-circuited. It can be seen that in the event of thermal runaway of the battery 100, the insulation performance of the insulating component 30 is poor.

[0082] When polyethylene terephthalate is used as the insulating component 30, under the test environment temperature of 250°C and the test time of 5 minutes, the polyethylene terephthalate melts and the overlap between the metal shell 21 and the metal strap 10 is short-circuited. It can be seen that in the case of thermal runaway of the battery 100, the insulation performance of the insulating component 30 is poor.

[0083] When mica is used as the insulating component 30, under the conditions of a test ambient temperature of 450°C and a test time of 5 minutes, the insulation resistance between the metal strap 10 and the metal shell 21 can be made 15.92 GΩ. It can be seen that in the case of thermal runaway of the battery 100, the insulating performance of the insulating component 30 is better.

[0084] In one embodiment of the present application, after the insulating component 30 is placed at an ambient temperature greater than or equal to 500° C. and less than or equal to 1500° C. for 1 minute, the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*1000 ohms.

[0085] Optionally, the insulation resistance between the metal strap 10 and the battery cell 20 can be ensured to be greater than or equal to A*B*1000 ohms under ambient temperatures of 500°C, 600°C, 700°C, 800°C, 1000°C, 1200°C, 1500°C, etc.

[0086] Specifically, the insulation performance between the metal binding band 10 and the metal shell 21 can be tested by the following method: Referring to FIG. 15 ,

[0087] The insulating component 30 is placed in an environment greater than or equal to 500° C. to 1500° C. for 1 minute;

[0088] Place the insulating component 30 between the metal strap 10 and the battery shell 21 (if there is a blue film on the outside of the metal shell 21, it must be torn off), use the insulation voltage withstand test device 2000 as the test equipment, electrically connect the positive and negative poles of the insulation voltage withstand test device 2000 to two aluminum blocks respectively, and apply a voltage of 500-1000V / DC for 1 minute to obtain the insulation resistance value.

[0089] Such a design allows the insulating component 30 to maintain the insulation resistance between the metal strap 10 and the metal shell 21 within a range greater than or equal to A*B*1000 ohms after being treated at a temperature of 500°C to 1500°C, thereby further improving the high-temperature resistance requirements of the insulating component 30. Therefore, even in the case of thermal runaway of the battery 100, the insulating component 30 can still maintain a better insulation effect to improve the overlap short circuit between the metal shell 21 and the metal strap 10.

[0090] In one embodiment of the present application, the insulating component 30 is mica or ceramic coating.

[0091] The ceramic coating may be an alumina ceramic coating, a zirconium oxide ceramic coating, a titanium oxide ceramic coating, a siloxane ceramic, or the like.

[0092] Such a design allows the material of the insulating component 30 to be a more high-temperature resistant material, so that after the insulating component 30 is treated at a temperature of 500°C to 1500°C, the insulation resistance between the metal strap 10 and the metal shell 21 can still be maintained in a range greater than or equal to A*B*1000 ohms. Therefore, when the battery 100 experiences thermal runaway, the insulating component 30 can also maintain a better insulation effect to improve the overlap short circuit between the metal shell 21 and the metal strap 10.

[0093] In one embodiment of the present application, after the insulating component 30 is placed at an ambient temperature greater than or equal to 250° C. and less than or equal to 500° C. for 5 minutes, the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*5000 ohms.

[0094] Optionally, the insulation resistance between the metal strap 10 and the battery cell 20 can be ensured to be greater than or equal to A*B*5000 ohms under ambient temperatures of 250°C, 280°C, 300°C, 400°C, 500°C, etc.

[0095] Specifically, the insulation performance between the metal binding band 10 and the metal shell 21 can be tested by the following method: Referring to FIG. 15 ,

[0096] The insulating component 30 is placed in an environment greater than or equal to 250° C. to 500° C. for 5 minutes;

[0097] Place the insulating component 30 between the metal strap 10 and the battery shell 21 (if there is a blue film on the outside of the metal shell 21, it must be torn off), use the insulation voltage withstand test device 2000 as the test equipment, electrically connect the positive and negative poles of the insulation voltage withstand test device 2000 to two aluminum blocks respectively, and apply a voltage of 500-1000V / DC for 1 minute to obtain the insulation resistance value.

[0098] In this embodiment, the insulating component 30 is made of at least one of phenolic film plastic / unsaturated polyester film plastic, epoxy glass fiber, mica, ceramic coating, polytetrafluoroethylene, polyimide, and aerogel. This allows the insulating component 30 to be made of a high-temperature resistant material, ensuring that the insulation resistance between the metal binding band 10 and the metal housing 21 remains within a range of greater than or equal to A*B*5000 ohms after being subjected to temperatures between 250°C and 500°C.

[0099] Such a design allows the insulating component 30 to maintain the insulation resistance between the metal strap 10 and the metal shell 21 within a range greater than or equal to A*B*5000 ohms after being treated at a temperature of 250°C to 500°C, thereby further improving the high-temperature resistance requirements of the insulating component 30. Therefore, even in the case of thermal runaway of the battery 100, the insulating component 30 can maintain a better insulation effect to improve the overlap short circuit between the metal shell 21 and the metal strap 10.

[0100] In one embodiment of the present application, after the insulating component 30 is placed at an ambient temperature greater than or equal to 500° C. and less than or equal to 1500° C. for 1 minute, the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*5000 ohms.

[0101] Optionally, the insulation resistance between the metal strap 10 and the battery cell 20 can be ensured to be greater than or equal to A*B*1000 ohms under ambient temperatures of 500°C, 600°C, 700°C, 800°C, 1000°C, 1200°C, 1500°C, etc.

[0102] Specifically, the insulation performance between the metal binding band 10 and the metal shell 21 can be tested by the following method: Referring to FIG. 15 ,

[0103] The insulating component 30 is placed in an environment greater than or equal to 500° C. to 1500° C. for 1 minute;

[0104] Place the insulating component 30 between the metal strap 10 and the battery shell 21 (if there is a blue film on the outside of the metal shell 21, tear it off), use the insulation voltage withstand test device 2000 as the test equipment, electrically connect the positive and negative poles of the insulation voltage withstand test device 2000 to two aluminum blocks respectively, and apply a voltage of 500-1000V / DC for 1 minute to obtain the insulation resistance value.

[0105] Such a design allows the insulating component 30 to maintain the insulation resistance between the metal strap 10 and the metal shell 21 within a range greater than or equal to A*B*5000 ohms after being treated at a temperature of 500°C to 1500°C, thereby further improving the high-temperature resistance requirements of the insulating component 30. Therefore, even in the case of thermal runaway of the battery 100, the insulating component 30 can still maintain a better insulation effect to improve the overlap short circuit between the metal shell 21 and the metal strap 10.

[0106] In one embodiment of the present application, A is greater than or equal to 3.2V, and A is less than or equal to 3.8V; and / or B is greater than or equal to 48, and B is less than or equal to 104.

[0107] Optionally, A can be 3.2V, 3.3V, 3.4V, 3.5V, 3.6V, 3.7V, 3.8V, etc.; B can be 48, 56, 74, 80, 88, 104, etc.

[0108] Such a design can enable the commonly used vehicle battery 100 to meet the insulation resistance between the metal strap 10 and each metal shell 21 greater than or equal to A*B*1000 ohms, so that there will be no insulation failure between the metal strap 10 and the battery cell 20 when the battery 100 experiences thermal runaway. Therefore, when the battery 100 experiences thermal runaway, the insulating component 30 can also maintain a better insulation effect to improve the overlap short circuit between the metal shell 21 and the metal strap 10.

[0109] In one embodiment of the present application, the positive electrode of the battery cell 20 includes lithium phosphate, and after the insulating component 30 is placed at an ambient temperature greater than or equal to 250°C and less than or equal to 500°C for 5 minutes, the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*1000 ohms.

[0110] Optionally, the insulation resistance between the metal strap 10 and the battery cell 20 can be ensured to be greater than or equal to A*B*1000 ohms under ambient temperatures of 250° C., 280° C., 300° C., 400° C., 500° C., etc.

[0111] With this design, when the positive electrode of the battery cell 20 includes a lithium phosphate, after the insulating component 30 is treated at a temperature of 250°C to 500°C, the insulation resistance between the metal strap 10 and the metal shell 21 can still be maintained within a range greater than or equal to A*B*1000 ohms.

[0112] In one embodiment of the present application, the positive electrode of the battery cell 20 includes Li a Ni b Co c M d O e A f , wherein, 0<a≤1.2; 0<b<1; 0<c<1; 0<d<1; 1≤e≤2; 0≤f≤1; M includes but is not limited to one or more of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B; A includes but is not limited to one or more of N, F, S and Cl; after the insulating component 30 is placed at an ambient temperature greater than or equal to 500℃ and less than or equal to 1500℃ for 1 minute, the insulation resistance between the metal strap 10 and each metal shell 21 is greater than or equal to A*B*1000 ohms.

[0113] Optionally, the insulation resistance between the metal strap 10 and the metal shell 21 can be ensured to be greater than or equal to A*B*1000 ohms under ambient temperatures of 500°C, 600°C, 700°C, 800°C, 1000°C, 1200°C, 1500°C, etc.

[0114] In this design, the positive electrode of the battery cell 20 includes Li a Ni b Co c M d O e A f When the insulating component 30 is treated at a temperature of 500°C to 1500°C, the insulation resistance between the metal strap 10 and the metal shell 21 can still be maintained in a range greater than or equal to A*B*1000 ohms, so that the high temperature resistance requirements of the insulating component 30 can be further improved. Therefore, when the battery 100 experiences thermal runaway, the insulating component 30 can also maintain a better insulation effect to improve the overlap short circuit between the metal shell 21 and the metal strap 10.

[0115] In one embodiment of the present application, the insulating component 30 is an insulating substrate 30a, an insulating tape 37 or a coating 30b;

[0116] 6 and 7 , the insulating component 30 is an insulating tape 37, which is wrapped around the metal binding tape 10. This design, by directly wrapping the high-temperature-resistant insulating tape 37 around the metal binding tape 10, can reduce the use of the insulating substrate 30a, reducing costs, and also enabling the insulating component 30 to maintain normal insulation performance even in a high-temperature environment.

[0117] Alternatively, referring to Figures 8 to 10 , the insulating component 30 is an insulating substrate 30a, which is attached to the metal binding band 10. This design allows the insulating substrate 30a of the insulating component 30 to be made of a high-temperature resistant material, eliminating the need for an additional high-temperature resistant structure (such as a high-temperature resistant coating) on ​​the insulating substrate 30a, thereby simplifying the process.

[0118] Alternatively, referring to Figure 12 , the insulating component 30 is a coating 30b applied to the metal strap 10. This design allows the high-temperature-resistant coating 30b to be applied directly to the surface of the metal strap 10, simplifying the process and ensuring proper insulation between the battery cell 20 and the metal strap 10 even in high-temperature environments. It should be noted that the coating 30b may be made of materials such as alumina ceramic, zirconia ceramic, titanium oxide ceramic, siloxane ceramic, polytetrafluoroethylene, or polyimide.

[0119] In some embodiments, to facilitate wrapping of the insulating tape 37, the insulating tape 37 can be made of a flexible material. For example, the insulating tape 37 can be made of fiber cloth and ceramic rubber, or ceramic fiber cloth. It should be noted that ceramic fiber cloth is made by spinning ceramic fibers with a certain proportion of organic fibers, lining them with glass fibers, and then weaving them into cloth.

[0120] Alternatively, the insulating tape 37 may include ceramic rubber and fiber cloth stacked together. For example, the ceramic rubber may be silicone rubber.

[0121] Such a design allows the insulating tape 37 to be made of a flexible material with good insulation resistance, making it easier to wrap the insulating tape 37 around the metal binding tape 10 .

[0122] In actual application, the extension direction of the metal strap 10 is defined as the length direction of the metal strap 10. The winding direction of the insulating tape 37 can be consistent with the length direction of the metal strap 10, or perpendicular to the length direction of the metal strap 10, or set at an acute angle or obtuse angle to the length direction of the metal strap 10.

[0123] In one embodiment of the present application, referring to FIG. 10 , the extending direction of the metal binding tape 10 is defined as the length direction of the metal binding tape 10 , and the winding direction of the insulating tape 37 is set at an angle to the length direction of the metal binding tape 10 .

[0124] It should be noted that the length direction of the metal binding tape 10 is defined as the X-axis direction of the metal binding tape 10. Specifically, the insulating tape 37 can be wound at a 45° angle along the X-axis direction of the metal binding tape 10, or at a 60° angle along the X-axis direction of the metal binding tape 10, or at a 15° angle along the X-axis direction of the metal binding tape 10, etc. Of course, in some embodiments, the insulating tape 37 can be wound at a 45° angle along the X-axis direction of the metal binding tape 10 to improve the winding stability of the insulating tape 37.

[0125] In actual application, the insulating tape 37 can be wrapped around a portion of the surface of the metal binding tape 10 , or can be wrapped around the entire surface of the metal binding tape 10 to cover the entire surface of the metal binding tape 10 .

[0126] In one embodiment of the present application, referring to FIG. 11 , the insulating tape 37 is bonded to the metal binding tape 10 .

[0127] In actual application, high temperature resistant glue can be used to bond the insulating tape 37 to the surface of the metal binding tape 10. The high temperature resistant glue can be phenolic resin glue, urea-formaldehyde resin glue, heat-resistant epoxy glue, polyimide glue, etc.

[0128] Such a design can improve the connection strength between the insulating tape 37 and the metal binding tape 10 by bonding the insulating tape 37 to the metal binding tape 10 .

[0129] In one embodiment of the present application, referring to FIG9 and FIG12 , when the insulating component 30 includes a coating 30b, the coating 30b is a hydrophobic coating. The apparent contact angle of the hydrophobic coating is defined as θ1, and the following conditions are satisfied: 151° ≤ θ1 ≤ 153°. Alternatively, the apparent contact angle θ1 of the hydrophobic coating can be 151°, 151.5°, 152°, 152.5°, 153°, and so on.

[0130] It should be noted that the apparent contact angle of the hydrophobic coating refers to the contact angle between water and the coating 30b in a static state.

[0131] Such a design, by setting the coating 30b as a hydrophobic coating and controlling the apparent contact angle θ1 of the hydrophobic coating to be between 151° and 153°, can improve the problem of the electrolyte sprayed from the battery 100 during thermal runaway adhering to and diffusing on the surface of the insulating component 30 or the metal strap 10, and can effectively prevent creepage caused by foreign matter adsorbed on the surface of the insulating component 30 or the surface of the metal strap 10, and can further improve the insulation reliability of the battery 100 during thermal runaway.

[0132] In one embodiment of the present application, referring to FIG. 9 and FIG. 12 , coating 30b is an oleophobic coating. The apparent contact angle of the oleophobic coating is defined as θ2, and the condition θ2 ≥ 90° is satisfied. Alternatively, the apparent contact angle of the oleophobic coating, θ2, can be 90°, 93°, 96°, 100°, 110°, and so on.

[0133] It should be noted that the apparent contact angle of the oleophobic coating refers to the contact angle between the oil and the coating 30 b in a static state.

[0134] Such a design, by setting the coating 30b as an oleophobic coating and making the apparent contact angle θ2 of the oleophobic coating greater than or equal to 90°, can also improve the problem of the electrolyte sprayed from the battery 100 adhering to and diffusing on the surface of the insulating component 30 or the metal strap 10 during thermal runaway, and can effectively prevent creepage caused by foreign matter adsorbed on the surface of the insulating component 30 or the surface of the metal strap 10, and can further improve the insulation reliability of the battery 100 during thermal runaway.

[0135] In one embodiment of the present application, the battery 100 further includes an isolation layer 30 c . The insulating component 30 is at least disposed on a surface of the isolation layer 30 c close to the metal shell 21 . The isolation layer 30 c is attached to the metal binding band 10 .

[0136] In actual application, the insulating component 30 may be entirely wrapped around the surface of the isolation layer 30 c , or may only be wrapped around the surface of the isolation layer 30 c close to the metal shell 21 .

[0137] With such a design, the high-temperature resistant insulating component 30 can be first set on the surface of the non-high-temperature resistant isolation layer 30c, and then the insulating component 30 and the isolation layer 30c can be set as a whole between the metal strap 10 and the metal shell 21, so that the metal strap 10 and the metal shell 21 can be insulated by the insulating component 30 and the isolation layer 30c, thereby improving the insulation effect between the metal strap 10 and the metal shell 21.

[0138] In one embodiment of the present application, the isolation layer 30c is a sheet-like film plastic, a phenolic film plastic / unsaturated polyester bulk film plastic, or an epoxy glass fiber board.

[0139] Such a design uses one of sheet film plastic, phenolic film plastic / unsaturated polyester bulk film plastic, and epoxy glass fiber board as the isolation layer 30c, which has low cost and good mechanical properties.

[0140] In one embodiment of the present application, referring to Figures 1 to 7 , the creepage distance L between the metal binding strap 10 and the metal housing 21 satisfies the condition that L is greater than or equal to 8 mm. Alternatively, the creepage distance between the metal housing 21 and the metal binding strap 10 can be 8 mm, 8.5 mm, 8.8 mm, 9 mm, 9.5 mm, and so on.

[0141] Such a design ensures that the creepage distance is greater than or equal to 8 mm, thereby providing a sufficiently long creepage distance between the battery cell 20 and the metal binding strap 10 , thereby improving the insulation reliability of the battery 100 during thermal runaway.

[0142] In one embodiment of the present application, referring to Figures 1 and 2 , the insulating component 30 includes a first insulating member 31 and a second insulating member 32 ; the first insulating member 31 is located between the battery cell 20 and the metal strap 10 , and the second insulating member 32 is located between the battery cell 20 and the metal strap 10 , and the second insulating member 32 is arranged crosswise with the first insulating member 31 .

[0143] In this embodiment, the first insulating member 31 and the second insulating member 32 have the same thickness, and the thickness of the first insulating member 31 or the thickness of the second insulating member 32 constitutes the creepage distance between the battery cell 20 and the metal binding tape 10 .

[0144] It should be noted that, referring to FIG. 2 , the thickness of the first insulating member 31 or the second insulating member 32 is defined as A'. Therefore, the creepage distance L between the battery cell 20 and the metal strap 10 is L = A', meaning that A' is greater than or equal to 8 mm. Alternatively, A' can be 8 mm, 8.5 mm, 8.8 mm, 9 mm, 9.5 mm, and so on.

[0145] Furthermore, the thickness of the first insulating member 31 refers to the distance between the surface of the first insulating member 31 abutting the metal strap 10 and the surface of the first insulating member 31 abutting the battery cell 20. Similarly, the thickness of the second insulating member 32 refers to the distance between the surface of the second insulating member 32 abutting the metal strap 10 and the surface of the second insulating member 32 abutting the battery cell 20.

[0146] In actual application, the distances between the two ends of the second insulating member 32 and the metal binding band 10 may be equal or unequal.

[0147] In some embodiments, the first insulating member 31 and the second insulating member 32 may be an integrally formed structure, which not only improves the strength of the insulating component 30 but also simplifies the manufacturing process of the insulating component 30 .

[0148] In actual application, the first insulating member 31 and the second insulating member 32 may both be in the shape of a sheet, a rod, or a plate.

[0149] With this design, since the shell of the battery cell 20 expands and deforms when the battery 100 experiences thermal runaway, the curved shell 20 will not contact the metal strap 10 in its entirety, but only needs to be separated without melting. Therefore, by using the cross-arranged first insulating member 31 and the second insulating member 32 to separate the metal shell 21 and the metal strap 10, the material usage of the insulating component 30 can be effectively reduced.

[0150] In one embodiment of the present application, referring to Figures 1 and 2 , a plurality of second insulating members 32 are provided. These second insulating members 32 are spaced apart and intersecting with the first insulating member 31 . At least one second insulating member 32 is provided for each battery cell 20 . This design allows each battery cell 20 to be isolated from the metal binding band 10 by the first insulating member 31 and at least one second insulating member 32 , further enhancing the insulation reliability of the insulating member 30 between the battery cell 20 and the metal binding band 10 .

[0151] In one embodiment of the present application, referring to Figures 1 and 2 , the angle between the first insulating member 31 and the second insulating member 32 is 90 degrees. This design allows the first insulating member 31 and the second insulating member 32 to form a roughly cross-shaped structure, thereby better isolating the battery cell 20 from the metal strap 10.

[0152] In one embodiment of the present application, referring to Figures 1 and 2 , the battery cell 20 is defined as having a height direction a and a width direction b. The first insulating member 31 is arranged in a strip shape, with its length direction c extending along the width direction b of the battery cell 20. This design allows the first insulating member 31 to effectively separate the battery cell 20 from the metal binding band 10 while further reducing the material used for the first insulating member 31.

[0153] It should be noted that the height direction a of the battery cell 20 refers to the vertical direction of the battery cell 20 when placed on the electrical device, and the width direction b of the battery cell 20 refers to the arrangement direction of the plurality of battery cells 20 .

[0154] The length direction c of the first insulating member 31 refers to the longest direction of the first insulating member 31 among the three directions.

[0155] In one embodiment of the present application, referring to Figures 1 and 2 , the battery cell 20 is defined as having a height direction a and a width direction b. The second insulating member 32 is arranged in a strip shape, with its length direction d extending along the height direction a of the battery cell 20. This design allows the second insulating member 32 to effectively separate the battery cell 20 from the metal binding band 10 while further reducing the material used for the second insulating member 32.

[0156] It should be noted that the length direction d of the second insulating member 32 refers to the longest direction of the second insulating member 32 among the three directions.

[0157] In one embodiment of the present application, referring to Figures 1 and 2 , the distances between the two ends of the second insulating member 32 and the metal binding band 10 are equal. That is, the middle portions of the first insulating member 31 and the second insulating member 32 are cross-connected.

[0158] Such a design can better separate the metal binding strip 10 and the battery cell 20 from the first insulating member 31 and the second insulating member 32 , thereby further improving the insulation reliability of the insulating member 30 to the battery cell 20 and the metal binding strip 10 .

[0159] In one embodiment of the present application, referring to FIG. 1 and FIG. 2 , the first insulating member 31 corresponds to the central axis of the metal binding band 10 .

[0160] It should be noted that the first insulating member 31 in this embodiment is an axisymmetric structure, for example, an axisymmetric structure in the shape of a sheet, a rod, or a plate, etc. Furthermore, the metal binding band 10 in this embodiment is also an axisymmetric structure.

[0161] In actual application, the width of the first insulating member 31 can be the same as the width of the metal strap 10, or it can be greater than the width of the metal strap 10, or it can be less than the width of the metal strap 10, as long as it can separate the shell of the battery cell 20 from the metal strap 10. No specific limitation is given here.

[0162] Such a design can more stably separate the housing of the battery cell 20 from the metal binding band 10 , thereby improving the insulation reliability of the insulating component 30 to the battery cell 20 and the metal binding band 10 .

[0163] In one embodiment of the present application, referring to FIG. 1 and FIG. 2 , each second insulating member 32 corresponds to the central axis of a battery cell 20 .

[0164] It should be noted that the second insulating member 32 in this embodiment is an axisymmetric structure, for example, an axisymmetric structure in the shape of a sheet, a rod, or a plate, etc. Furthermore, the metal binding band 10 in this embodiment is also an axisymmetric structure.

[0165] In actual application, the width of the second insulating member 32 can be consistent with the width of the battery cell 20, or it can be greater than the width of the battery cell 20, or it can be less than the width of the battery cell 20, as long as it can separate the shell of the battery cell 20 from the metal strap 10. No specific limitation is given here.

[0166] It should be noted that the width of the second insulating member 32 depends on the diameter of the corresponding electrode in the battery cell 20 .

[0167] Such a design can also more stably separate the housing of the battery cell 20 from the metal binding band 10 , thereby improving the insulation reliability of the insulating component 30 to the battery cell 20 and the metal binding band 10 .

[0168] In another embodiment of the present application, referring to FIG. 3 to FIG. 5 and FIG. 7 , the insulating component 30 completely covers the surface of the metal binding band 10 facing the battery cell 20 .

[0169] In actual application, the end of the insulating component 30 may protrude from the end of the metal binding band 10 , or may be flush with the end of the metal binding band 10 .

[0170] This design, by completely covering the surface of the metal strap 10 facing the battery cell 20 through the insulating component 30, can better separate the shell of the battery cell 20 from the metal strap 10, and better improve the problem of insulation failure between the battery cell 20 and the metal strap 10.

[0171] In another embodiment of the present application, referring to FIG. 3 to FIG. 5 and FIG. 7 , the battery cell 20 is defined to have a height direction a. In the height direction a of the battery cell 20 , both ends of the insulating component 30 protrude from the metal binding band 10 .

[0172] It should be noted that the length by which the end of the insulating component 30 protrudes from the metal binding strap 10 determines the creepage distance between the battery cell 20 and the metal binding strap 10 .

[0173] Such a design can extend the shortest distance between the surface where the insulating component 30 contacts the battery cell 20 and the surface of the metal strap 10, so that there is a sufficiently long creepage distance between the battery cell 20 and the metal strap 10, which can improve the insulation reliability of the battery 100 during thermal runaway.

[0174] In some embodiments, the portion of the end of the insulating component 30 protruding from the metal binding band 10 may be extended along the height direction a of the battery cell 20 .

[0175] In actual application, the insulating component 30 can be a separate block structure, and each battery cell 20 is correspondingly provided with an insulating component 30; or, the insulating component 30 can also be a long strip structure, and each battery cell 20 corresponds to a different position of the insulating component 30.

[0176] In this embodiment, referring to FIG. 4 , the thickness of the insulating component 30 is defined as A", and the length of the end of the insulating component 30 protruding from the metal strap 10 is defined as B". The creepage distance L between the battery cell 20 and the metal strap 10 is L = A + B. In other words, A + B is greater than or equal to 8 mm. A + B can be 8 mm, 8.5 mm, 8.8 mm, 9 mm, 9.5 mm, and so on.

[0177] In some embodiments, referring to FIG. 3 to FIG. 5 , the metal binding strap 10 is defined to have a front side facing the battery cell 20 and a back side facing away from the front side, and both ends of the insulating component 30 are bent toward the back side.

[0178] In this embodiment, the insulating component 30 may include an insulating plate 33, two connecting sections 34 and two limiting plates 35; the insulating plate 33 is located between the battery cell 20 and the metal strap 10, that is, the insulating plate 33 is located on the front side of the metal strap 10; the two connecting sections 34 are respectively connected to the opposite side edges of the insulating plate 33, and respectively abut against the opposite side edges of the metal strap 10; each limiting plate 35 is connected to a side edge of a connecting section 34 away from the insulating plate 33, the limiting plate 35 is located on the back side of the metal strap 10, and the limiting plate 35 is arranged opposite to the insulating plate 33; wherein the shortest path on the outer surface of the connecting section 34, the length of the limiting plate 35 and the thickness of the limiting plate 35 constitute the creepage distance between the battery cell 20 and the metal strap 10.

[0179] In this embodiment, the insulating plate 33 , the connecting section 34 and the limiting plate 35 are all insulating structures, so that the insulating component 30 has good insulation reliability.

[0180] It should be noted that, referring to FIG. 4 , the shortest path on the outer surface of the connecting section 34 is defined as A, the length of the limiting plate 35 is defined as B, and the thickness of the limiting plate 35 is defined as C. The creepage distance L between the battery cell 20 and the metal strap 10 is defined as L = A + B + C. In other words, A + B + C is greater than or equal to 8 mm. A + B + C can be 8 mm, 8.5 mm, 8.8 mm, 9 mm, 9.5 mm, and so on.

[0181] Furthermore, the shortest path on the outer surface of the connecting section 34 refers to the shortest path between the side of the connecting section 34 abutting the battery cell 20 and the side of the connecting section 34 abutting the battery cell 20. The length of the limiting plate 35 refers to the distance from the top to the bottom of the limiting plate 35 in the height direction a of the battery cell 20. The width of the limiting plate 35 refers to the distance from the side of the limiting plate 35 closest to the metal band 10 to the side farther away from the metal band 10.

[0182] In some embodiments, the insulating plate 33 , the two connecting sections 34 , and the two limiting plates 35 may be an integrally formed structure, which not only improves the strength of the insulating component 30 , but also simplifies the preparation process of the insulating component 30 .

[0183] In actual application, the connecting section 34 may be a straight connecting section 34 , an arc-shaped connecting section 34 , or a wavy connecting section 34 .

[0184] Such a design allows the insulating component 30 to be half-surrounded or fully surrounded by the metal strap 10, that is, connected to the metal strap 10, to improve the connection reliability between the insulating component 30 and the metal strap 10, while ensuring sufficient creepage distance between the battery cell 20 and the metal strap 10.

[0185] In one embodiment of the present application, referring to FIG. 3 to FIG. 5 , the connecting section 34 is an arc-shaped connecting section 34 .

[0186] In some embodiments, an arc-shaped connecting section 34 may be formed between the insulating plate 33 and the limiting plate 35 by bending.

[0187] Such a design can reduce the stress at the connection between the connecting section 34 and the insulating plate 33 and the limiting plate 35 , thereby improving the connection reliability between the connecting section 34 and the insulating plate 33 and the limiting plate 35 .

[0188] In another embodiment of the present application, both ends of the insulating component 30 cover the back surface of the metal binding band 10 , and the two ends of the insulating component 30 are partially overlapped or spaced apart.

[0189] In some embodiments, referring to Figures 4 and 5 , the two ends of the insulating component 30 are spaced apart, that is, the insulating component 30 can be roughly "C"-shaped, so that the insulating component 30 is half-surrounded by the metal strap 10. This makes it easier to assemble the insulating component 30 and the metal strap 10.

[0190] In other embodiments, referring to FIG. 7 , the two ends of the insulating component 30 partially overlap to form an overlapping portion 38 , so that the insulating component 30 can be fully surrounded by the metal binding band 10 , thereby improving the insulation effect of the insulating component 30 .

[0191] It should be noted that the two end portions of the insulating member 30 are the ends of the two limiting plates 35 . Furthermore, the overlapping portion 38 formed by the two end portions of the insulating member 30 is the portion where the two limiting plates 35 overlap.

[0192] In some embodiments, in the height direction a of the battery cell 20 , the overlapping portions 38 formed at both ends of the insulating component 30 may overlap by 5 mm. Of course, the overlapping may also be by 3 mm, 4 mm, 6 mm, 7 mm, etc.

[0193] In this embodiment, the overlapping length of the overlapping portion 38 is L′, please refer to FIG. 7 .

[0194] In one embodiment of the present application, referring to FIG. 6 and FIG. 7 , the battery 100 further includes a heat shrink tube 40 , which is sleeved on the outer side of the insulating component 30 .

[0195] It should be noted that the heat shrink tube 40 refers to a structure that can shrink at a preset temperature. For example, the heat shrink tube 40 may be made of polytetrafluoroethylene.

[0196] This design uses a heat shrink tube 40 to be sleeved on the outside of the insulating component 30, which can fix the insulating component 30 and the metal strap 10 and provide secondary protection for the metal strap 10, thereby effectively improving the insulation reliability of the insulating component 30.

[0197] The present application also proposes an electrical device, which includes the above-mentioned battery 100. The specific structure of the battery 100 refers to the above-mentioned embodiment. Since the present electrical device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0198] According to some embodiments of the present application, the present application provides a battery 100, comprising a plurality of battery cells 20, a metal strap 10 and an insulating component 30; the plurality of battery cells 20 are arranged side by side; the metal strap 10 passes around the plurality of battery cells 20 to bind the plurality of battery cells 20; the insulating component 30 is connected to the battery cell 20 and / or the metal strap 10, and the insulating component 30 is at least partially located between the battery cell 20 and the metal strap 10; under the condition that the melting temperature is greater than or equal to 300°C and less than or equal to 1500°C, the insulation resistance between the metal strap 10 and the battery cell 20 is greater than or equal to 1 megohm.

[0199] In the technical solution of the embodiment of the present application, an independent insulating component 30 is provided to connect the insulating component 30 to the battery cell 20 or the metal strap 10, and at least a portion of the insulating component 30 is located between the battery cell 20 and the metal strap 10, thereby protecting the battery cell 20. Wherein, under the condition that the melting temperature is greater than or equal to 300°C and less than or equal to 1500°C, the insulation resistance between the metal strap 10 and the battery cell 20 is greater than or equal to 1 megohm. Therefore, when the battery 100 is in thermal runaway, the insulation resistance between the metal strap 10 and the battery cell 20 can also be maintained in a range greater than or equal to 1 megohm, so that the problem of insulation failure between the metal strap 10 and the battery cell 20 will not occur when the battery 100 suffers from thermal runaway.

[0200] The present application also proposes an energy storage device, which includes the above-mentioned battery 100. The specific structure of the battery 100 refers to the above-mentioned embodiment. Since the energy storage device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0201] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application description and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery, wherein: include: A plurality of battery cells, wherein the plurality of battery cells are arranged side by side, and each of the battery cells comprises a metal shell; a metal binding band, which is passed around the plurality of battery cells and is used to bind the plurality of battery cells together; an insulating component, wherein the insulating component is at least partially located between the battery cell and the metal binding band; The insulation resistance between the metal strap and each of the metal shells is greater than or equal to A*B*1000 ohms, where A is the nominal voltage of the battery cell, in V; and B is the number of battery cells connected in series, in pieces.

2. The battery according to claim 1, wherein After the insulating component is placed at an ambient temperature greater than or equal to 250° C. and less than or equal to 500° C. for 5 minutes, the insulation resistance between the metal binding band and each of the metal shells is greater than or equal to A*B*1000 ohms.

3. The battery according to claim 1 or 2, wherein the insulating component is phenolic film plastic / unsaturated polyester bulk film plastic, epoxy glass fiber, mica, ceramic coating, polytetrafluoroethylene, polyimide or aerogel.

4. The battery according to claim 1, wherein After the insulating component is placed at an ambient temperature greater than or equal to 500° C. and less than or equal to 1500° C. for 1 minute, the insulation resistance between the metal binding band and each of the metal shells is greater than or equal to A*B*1000 ohms. The battery according to claim 4 , wherein the insulating component is mica or a ceramic coating.

6. The battery according to claim 1, wherein After the insulating component is placed at an ambient temperature greater than or equal to 250° C. and less than or equal to 500° C. for 5 minutes, the insulation resistance between the metal binding band and each of the metal shells is greater than or equal to A*B*5000 ohms.

7. The battery according to claim 1, wherein After the insulating component is placed at an ambient temperature greater than or equal to 500° C. and less than or equal to 1500° C. for 1 minute, the insulation resistance between the metal binding band and each of the metal shells is greater than or equal to A*B*5000 ohms.

8. The battery according to claim 1, wherein A is greater than or equal to 3.2 V and A is less than or equal to 3.8 V; and / or B is greater than or equal to 48, and B is less than or equal to 104.

9. The battery according to claim 1, wherein the positive electrode of the battery cell comprises a lithium phosphate, and the insulating component is placed at an ambient temperature greater than or equal to 250°C and less than or equal to 500°C for 5 minutes, so that the insulation resistance between the metal strap and each of the metal shells is greater than or equal to A*B*1000 ohms.

10. The battery according to claim 1, wherein the positive electrode of the battery cell comprises LiaNibCocMdOeAf, wherein: 0<a≤1.2;0<b<1; 0＜c＜1； 0<d<1; 1≤e≤2; 0≤f≤1; M includes but is not limited to one or more of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B; A includes but is not limited to one or more of N, F, S and Cl; after the insulating component is placed at an ambient temperature greater than or equal to 500°C and less than or equal to 1500°C for 1 minute, the insulation resistance between the metal strap and each of the metal shells is greater than or equal to A*B*1000 ohms.

11. The battery according to any one of claims 1 to 10, wherein The insulating component is an insulating substrate, and the insulating substrate is attached to the metal strap; or The insulating component is an insulating tape, and the insulating tape is wound around the metal binding tape; or The insulating component is a coating, and the coating is applied to the metal binding tape.

12. The battery according to claim 11, wherein The insulating tape includes ceramic rubber and fiber cloth which are stacked.

13. The battery according to claim 11, wherein When the insulating component includes the coating, the coating is a hydrophobic coating, and the apparent contact angle of the hydrophobic coating is defined as θ1, then the condition is satisfied: 151°≤θ1≤153°; And / or, the coating is an oleophobic coating, and the apparent contact angle of the oleophobic coating is defined as θ2, then the condition is satisfied: θ2 ≥ 90°.

14. The battery according to any one of claims 1 to 10, wherein The battery further includes an isolation layer, the insulating component is at least provided on a surface of the isolation layer close to the metal shell, and the isolation layer is attached to the metal binding strap.

15. The battery according to claim 14, wherein The isolation layer is a sheet-like film plastic, a phenolic film plastic / unsaturated polyester bulk film plastic or an epoxy glass fiber board.

16. The battery according to any one of claims 1 to 15, wherein The creepage distance between the metal strap and the metal shell is L, and the condition L is greater than or equal to 8 mm.

17. The battery according to any one of claims 1 to 10, wherein The insulating component comprises: a first insulating member, the first insulating member being located between the battery cell and the metal binding band; A second insulating member is located between the battery cell and the metal binding band, and the second insulating member is arranged to cross the first insulating member.

18. The battery according to claim 17, wherein There are multiple second insulating members, which are arranged at intervals and cross-arranged with the first insulating member, and each battery cell is correspondingly provided with at least one second insulating member; and / or, the angle between the first insulating member and the second insulating member is 90 degrees; And / or, the battery cell is defined as having a height direction and a width direction, the first insulating member is arranged in a strip shape, and its length direction extends along the width direction of the battery cell; And / or, the battery cell is defined as having a height direction and a width direction, the second insulating member is arranged in a strip shape, and its length direction extends along the height direction of the battery cell.

19. The battery according to any one of claims 1 to 10, wherein The insulating component completely covers a surface of the metal binding tape facing the battery cell.

20. The battery according to claim 19, wherein The battery cell is defined to have a height direction, and in the height direction of the battery cell, both ends of the insulating component protrude from the metal binding band.

21. The battery according to claim 20, wherein The metal binding band is defined to have a front side facing the battery cell and a back side facing away from the front side, and both ends of the insulating component are bent toward the back side.

22. The battery according to claim 21, wherein Both ends of the insulating component cover the back surface of the metal binding band, and the two ends of the insulating component are partially overlapped or spaced apart.

23. The battery according to any one of claims 1 to 10, wherein The battery further includes a heat shrink tube, which is sleeved on the outer side of the insulating component.

24. An electrical device, wherein: Comprising the battery according to any one of claims 1 to 23.

25. An energy storage device, wherein: Comprising the battery according to any one of claims 1 to 23.

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