Battery monomer, battery, electric equipment and energy storage equipment

Abstract

The utility model discloses a battery monomer, a battery, electric equipment and energy storage equipment. Each single battery comprises a shell, at least two electrode assemblies and an insulating part, the electrode assemblies are accommodated in the shell, the insulating part is arranged between the electrode assemblies and the shell, at least two accommodating cavities are formed by the insulating part, at least one electrode assembly is accommodated in each accommodating cavity, and the heat-resistant temperature of the insulating part is greater than 300 DEG C. According to the battery monomer, the plurality of accommodating cavities are formed through the insulating parts, each accommodating cavity at least accommodates one electrode assembly, and the heat-resistant temperature of the insulating parts is greater than 300 DEG C, so that the insulating parts can prolong the heat spreading time of the electrode assemblies when a certain electrode assembly is subjected to thermal runaway, thereby reducing the instantaneous heat production amount and the gas production amount; and the high-temperature gas is gradually discharged from the explosion-proof valve, so that the phenomenon of thermal runaway diffusion of the battery monomers is avoided, and the safety of the battery monomers is improved.

Description

TECHNICAL FIELD

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

[0002] The part provided in this part is only background information related to the present application, which is not necessarily prior art.

[0003] With the rapid development of the battery industry, the safety requirements of battery cells are becoming higher and higher. With the vigorous development of the new energy industry, the demand for energy batteries in various industries is increasing, and the demand for batteries with higher energy density, better cycle characteristics and higher safety characteristics is increasing sharply. Therefore, how to improve the safety of the battery is a technical problem that needs to be solved in the battery technology. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery, a power consumption device and an energy storage device, which can effectively reduce the phenomenon of thermal runaway diffusion of the battery monomer and improve the safety of the battery monomer.

[0005] In the first aspect, the embodiments of the present application provide a battery monomer, comprising:

[0006] a shell;

[0007] an electrode assembly accommodated in the shell, the electrode assembly is provided as at least two;

[0008] an insulating piece provided between the electrode assembly and the shell, the insulating piece forms at least two accommodation cavities, each of the accommodation cavities accommodates at least one of the electrode assemblies, and the heat resistance temperature of the insulating piece is greater than 300 degrees Celsius.

[0009] In the battery monomer of the present application, a plurality of accommodation cavities are formed by the insulating piece, each of the accommodation cavities accommodates at least one electrode assembly, and the heat resistance temperature of the insulating piece is greater than 300 degrees Celsius. When thermal runaway occurs in a certain electrode assembly, the insulating piece can prolong the heat spread time of the electrode assembly, thereby reducing the instantaneous heat generation and gas generation, and gradually discharging the high-temperature gas from the explosion-proof valve. In this way, the phenomenon of thermal runaway diffusion of the battery monomer is avoided, and the safety of the battery monomer is improved.

[0010] In some embodiments, the insulating piece is provided with a through hole communicating with the accommodation cavities.

[0011] In this embodiment, the through holes can effectively promote the dissipation of heat from the inside of the battery monomer to the outside, reduce the accumulation of heat generated by the battery monomer during charging and discharging, and improve the thermal management efficiency of the battery monomer. In addition, the design of the through holes also allows the electrolyte to flow more freely inside the battery cell, which helps to ensure that the electrode assembly is fully soaked with electrolyte.

[0012] In some embodiments, the through holes include a plurality of through holes arranged in a first direction, and the first direction is the opening direction of the accommodating cavity.

[0013] In this embodiment, the plurality of through holes are arranged in the opening direction of the accommodating cavity, which helps to form a more uniform and efficient flow path for the electrolyte inside the battery cell. The array arrangement ensures that the gas can be quickly discharged in multiple directions, reducing the risk of excessive local pressure, thereby improving the safety of the battery monomer.

[0014] In some embodiments, the through holes are at least one of circular, elliptical, and polygonal.

[0015] In this embodiment, the shape of the through hole is limited, wherein the circular through hole can provide a smooth electrolyte flow path and reduce flow resistance. At the same time, the circular through hole can uniformly distribute stress when subjected to pressure, reducing the risk of material cracking. The elliptical through hole provides more space in the length direction, which is conducive to the rapid flow of electrolyte in a specific direction. The polygonal through hole has clear corners and straight boundaries, which is convenient for positioning and processing during manufacturing.

[0016] In some embodiments, the thickness of the insulating member ranges from 0.05 to 0.5 mm.

[0017] In this embodiment, the thickness of the insulating member is limited, which can meet the performance and safety requirements of the battery monomer, and also balance the manufacturing cost and process feasibility.

[0018] In some embodiments, the thickness of the insulating member ranges from 0.1 to 0.3 mm.

[0019] In this embodiment, the thickness of the insulating member is limited, which facilitates the close cooperation and good sealing of the insulating member with other components of the battery monomer. In addition, the insulating member with this thickness range is also easier to achieve uniform coating and precise cutting during the manufacturing process.

[0020] In some embodiments, the insulating member is made of at least one material selected from the group consisting of polyimide film and mica film.

[0021] The polyimide film can effectively isolate the positive and negative electrodes inside the battery monomer, prevent short circuit, and maintain stable performance in high temperature environment to prevent the battery monomer from overheating. The application of mica film in the battery monomer can effectively reduce the heat transfer and accumulation, and maintain the stability of the internal temperature of the battery monomer. The lamination of the polyimide film and the mica film can not only maintain the electrical insulation performance and mechanical strength of the polyimide film, but also increase the heat insulation effect of the mica film.

[0022] In some embodiments, at least part of the accommodation cavities are filled with a fire-retardant material.

[0023] In this embodiment, the addition of the fire-retardant material significantly improves the safety of the battery monomer in the case of thermal runaway. In addition to the heat insulation performance of the insulating member itself, the fire-retardant material also provides an additional heat insulation layer. The fire-retardant material can quickly respond and prevent the spread of fire, which helps to further reduce the heat transfer speed inside the battery monomer, prolong the development time of the thermal runaway event, and reduce the impact of the thermal runaway event on the entire battery.

[0024] In some embodiments, the insulating member comprises a plurality of side covering sheets, a plurality of main covering sheets, and an inner covering sheet. Each of the main covering sheets is connected to one of the side covering sheets on both sides, and together encloses a receiving space. The inner covering sheet is located in the receiving space to divide the receiving space into at least two accommodation cavities.

[0025] In this embodiment, the insulating member is composed of the plurality of side covering sheets, main covering sheets, and inner covering sheets, forming an effective heat insulation barrier. The heat insulation barrier not only improves the heat insulation performance, but also enhances the stability and durability of the structure. The inner covering sheet is located in the receiving space and connected to the side covering sheets. This connection ensures the sealing of the accommodation cavities and prevents the leakage of high-temperature gas and harmful substances during thermal runaway. The multi-layer covering design significantly improves the heat insulation performance of the insulating member. Even if one of the electrode assemblies experiences thermal runaway, the spread of heat and harmful gas will be greatly hindered, thereby prolonging the heat spread time.

[0026] In some embodiments, the area of the main covering sheet is larger than the area of the side covering sheet. The main covering sheet is perpendicular to the second direction, and the side covering sheet is parallel to the third direction. The second direction intersects the third direction, and the second direction is the thickness direction of the electrode monomer.

[0027] In this embodiment, the side covering sheet is parallel to the second direction, and the second direction intersects the third direction. This arrangement helps to form a continuous heat insulation layer on the side of the battery monomer, ensuring the continuity of the heat insulation in the side direction of the battery monomer, and preventing heat leakage from the side.

[0028] In some embodiments, the side cover sheet, the main cover sheet and the inner cover sheet are made by an integral molding process.

[0029] In this embodiment, the integral molding process can ensure that the connection between the components is more secure, reduce the structural weakness caused by separate assembly, and improve the overall structural strength.

[0030] In a second aspect, the application provides a battery, comprising the battery cell of any one of the above.

[0031] In the above technical solution, in the battery composed of the battery cell, a plurality of accommodating cavities are formed by the insulating piece, each accommodating cavity accommodates at least one electrode assembly, and the heat resistance temperature of the insulating piece is greater than 300 degrees Celsius. When a certain electrode assembly is in thermal runaway, the insulating piece can prolong the heat spread time of the electrode assembly, thereby reducing the instantaneous heat generation and gas generation, and gradually discharging the high-temperature gas from the explosion-proof valve. In this way, the phenomenon of thermal runaway diffusion of the battery cell is avoided, and the safety of the battery is significantly improved.

[0032] In a third aspect, the application provides an electric device, comprising the battery of the above, and the battery is used to provide electric energy for the electric device.

[0033] In the above technical solution, it has the same beneficial effects as the battery proposed in the application or any embodiment of the application, which will not be repeated here.

[0034] In a fourth aspect, the application provides an energy storage device, comprising the battery of the above, and the battery is used to provide electric energy for the electric device.

[0035] In the above technical solution, it has the same beneficial effects as the battery proposed in the application or any embodiment of the application, which will not be repeated here.

[0036] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0037] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered limiting the application. Moreover, the same reference numbers are used to represent the same components throughout the drawings. In the drawings:

[0038] Figure 1 is a structural schematic diagram of a vehicle provided by some embodiments of the application;

[0039] Figure 2 is an exploded view of a battery provided by some embodiments of the present application;

[0040] Figure 3 is an exploded view of a battery cell provided by some embodiments of the present application;

[0041] Figure 4 is a partial schematic view of a battery cell provided by some embodiments of the present application;

[0042] Figure 5 is a schematic view of an internal structure of an electrode assembly of some embodiments of the present application;

[0043] Figure 6 is a schematic view of a structure of an insulating member of some embodiments of the present application;

[0044] Figure 7 is a schematic view of a structure of an insulating member of some embodiments of the present application.

[0045] Reference Signs:

[0046] 1000 - vehicle, 100 - battery, 200 - controller, 300 - motor, 20 - case, 201 - first case, 202 - second case;

[0047] Battery cell 10, 1 - outer shell, 11 - shell, 12 - end cover, 2 - electrode assembly, 21 - tab, 21a - positive electrode tab, 21b - negative electrode tab, 22 - positive electrode sheet, 23 - negative electrode sheet, 24 - separator, 3 - electrode terminal, 4 - pressure relief mechanism, 5 - insulating member, 51 - accommodating cavity, 52 - through hole, 53 - main cladding sheet, 54 - side cladding sheet, 55 - inner cladding sheet, Z - first direction, X - second direction, Y - third direction. DETAILED DESCRIPTION

[0048] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying 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.

[0049] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, 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.

[0050] 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 "multiple" is more than two, unless otherwise explicitly specified and limited.

[0051] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection 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 all refer to the same embodiment, nor is it necessarily independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, X and / or Y, which can represent the three cases of X alone, X and Y together, and Y alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] With the vigorous development of new energy industry, the demand for energy batteries in various industries is increasing. There is a sharp increase in demand for batteries with higher energy density, better cycle performance, and higher safety performance.

[0057] The battery cell in the battery is mainly in a jelly roll (JR) structure or a stacked structure. In the jelly roll structure, the positive electrode sheet, the negative electrode sheet, and the separator are orderly wound together to form a compact core roll. In the stacked structure, the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked. The JR structure has been widely used due to its high production efficiency, low manufacturing cost, good battery consistency, and high volume energy density. However, on the one hand, the JR structure of the battery cell is difficult to dissipate heat due to the winding of the electrode sheets together. When high-rate charging and discharging, a large amount of heat may be generated inside the battery. If the heat is not dissipated in time, it may affect the performance and safety of the battery. On the other hand, for high-capacity batteries, larger size battery cells are needed. However, when a larger size JR structure battery cell experiences thermal runaway, more heat is generated, and the generated gas is more difficult to exhaust, resulting in the burning of the large surface of the battery shell, causing heat to be transferred to other battery cells, triggering thermal runaway diffusion. Furthermore, as the thickness of the large size JR increases, the risk of tearing of the tabs at the outer side of the electrode sheet increases.

[0058] Based on the above considerations, please refer to Figure 1 The battery cell provided by the present application includes a shell, an electrode assembly, and an insulating piece. The electrode assembly is accommodated in the shell, and the electrode assembly is provided in at least two. The insulating piece is arranged between the electrode assembly and the shell, and the insulating piece forms at least two accommodation cavities. Each accommodation cavity accommodates at least one electrode assembly. The heat resistance temperature of the insulating piece is greater than 300 degrees Celsius.

[0059] In such a battery cell, when thermal runaway occurs in a certain electrode assembly, the insulating piece can block the thermal spread of the electrode assembly to other electrode assemblies in the accommodation cavity, prolonging the thermal spread time of the electrode assembly, thereby reducing the instantaneous heat generation and gas generation, allowing the high-temperature gas to gradually exhaust from the explosion-proof valve. In this way, the risk of thermal runaway diffusion of the battery cell is reduced, and the safety of the battery cell is improved.

[0060] The battery cell described in the embodiments of the present application is suitable for use in batteries and power consumption devices using battery cells.

[0061] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. 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 electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electric device is not specially limited in the embodiments of the present application.

[0062] The following embodiments take the vehicle as an example for convenience of description.

[0063] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000.

[0064] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0065] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 , Figure 2 is an exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 can include a battery monomer 10 and a box 20, and the battery monomer 10 is contained in the box 20.

[0067] The box 20 is a component for containing the battery monomer 10, and the box 20 provides a containing space for the battery monomer 10, and the box 20 can adopt various structures.

[0068] In some embodiments, the box 20 can include a first box 201 and a second box 202, and the first box 201 and the second box 202 are mutually covered to define a containing space for containing the battery monomer 10.

[0069] The first box 201 and the second box 202 can be in various shapes, such as a cuboid, a cylinder, etc. The first box 201 can be a hollow structure with one side open, and the second box 202 can also be a hollow structure with one side open. The open side of the second box 202 is covered on the open side of the first box 201, and then the box 20 with a containing space is formed. Alternatively, the first box 201 can be a hollow structure with one side open, and the second box 202 can be a plate structure. The second box 202 is covered on the open side of the first box 201, and then the box 20 with a containing space is formed. The first box 201 and the second box 202 can be sealed by a sealing element, which can be a sealing ring, sealing glue, etc.

[0070] In the battery 100, the battery cell 10 can be one or multiple. If the battery cell 10 is multiple, the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that some of the multiple battery cells 10 are connected in series and some are connected in parallel. The multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box 20. Alternatively, all the battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and the whole formed by all the battery cells 10 is contained in the box 20.

[0071] Please refer to Figure 3 and Figure 4 , Figure 3 is an exploded view of the battery cell 10 provided in some embodiments of the present application; Figure 4 is Figure 3 a partial structure diagram of the battery cell 10 shown in FIG. 1. The battery cell 10 can include a housing 1, at least two electrode assemblies 2, and an insulating member 5. The electrode assemblies 2 are contained in the housing 1, and the insulating member 5 is arranged between the electrode assemblies 2 and the housing 1.

[0072] In some embodiments, the housing 1 can include a shell 11 and an end cover 12. The shell 11 has an opening, and the end cover 12 closes the opening of the shell 11.

[0073] The shell 11 is a component for containing the electrode assemblies 2. The shell 11 can be a hollow structure with one end open, or a hollow structure with opposite ends open. The shell 11 can be in various shapes, such as a cylinder, a cuboid, etc. The shell 11 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assemblies can be partially located in the shell 11 or entirely located in the shell 11.

[0074] End cap 12 is a component that closes the opening of housing 11 to isolate the internal environment of battery cell 10 from the external environment. End cap 12 and housing 11 together define a receiving space for accommodating electrode assembly 10, electrolyte, and other components. End cap 12 can be connected to housing 11 by welding or roll sealing to close the opening of housing 11. The shape of end cap 12 can be adapted to the shape of housing 11. For example, if housing 11 is a cuboid structure, end cap 12 can be a rectangular plate structure adapted to housing 11; or if housing 11 is a cylindrical structure, end cap 12 can be a circular plate structure adapted to housing 11. The material of end cap 12 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The materials of end cap 12 and housing 11 can be the same or different.

[0075] In an embodiment where the housing 11 has an opening at one end, one end cap 12 may be provided accordingly. In an embodiment where the housing 11 has openings at both opposite ends, two end caps 12 may be provided accordingly. The two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define the receiving space.

[0076] In some embodiments, the battery cell 10 may further include electrode terminals 3, which are disposed on the housing 1 and are used for electrical connection with the tabs 21 of the electrode assembly 2 to input or output electrical energy of the battery cell 10. The electrode terminals 3 may be disposed on the housing 11 of the housing 1 or on the end cap 12 of the housing 1. The electrode terminals 3 and the tabs 21 may be directly connected, for example, by welding. Alternatively, the electrode terminals 3 and the tabs 21 may be indirectly connected, for example, through a current collector. The current collector may be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0077] In some embodiments, the battery cell 10 may further include a pressure relief mechanism 4, which may be disposed on the end cap 12 or the housing 11. The pressure relief mechanism 4 may be a pressure relief component installed on the housing 11 or the end cap 12, such as an explosion-proof plate or a safety valve. The pressure relief mechanism 4 may also be integrally formed with the end cap 12 or the housing 11. The pressure relief mechanism 4 may be provided with a pressure relief groove to split along the pressure relief groove when the battery cell 10 is depressurized. The pressure relief groove may be a groove extending along a closed trajectory, which may be a circular trajectory, a rectangular trajectory, etc.; the pressure relief groove may also be a groove extending along a non-closed trajectory, which may be an H-shaped trajectory, a Y-shaped trajectory, a V-shaped trajectory, a U-shaped trajectory, etc.

[0078] As an example, such as Figure 3As shown, the shell 11 is formed with an opening at one end, and the end cover 12 in the shell 1 is one, and one end cover 12 seals one opening of the shell 11. The end cover 12 is provided with a pressure relief mechanism 4, and the end cover 12 is provided with two electrode terminals 3, and the two electrode terminals 3 are respectively a positive electrode terminal and a negative electrode terminal. The end of the electrode assembly facing the end cover 12 is formed with a positive electrode tab 21a and a negative electrode tab 21b, and the positive electrode terminal is electrically connected with the positive electrode tab 21a, and the negative electrode terminal is electrically connected with the negative electrode tab 21b.

[0079] The electrode assembly 2 is at least partially accommodated in the shell 11, and the number of the electrode assembly 2 can be 2, 3, 4, 5, 6, 8, 10 or even more, that is, the number of the electrode assembly 2 is not limited in particular, and can be set according to actual needs. Understandably, compared with a single large-size electrode assembly 2, the setting of multiple electrode assemblies 2 can ensure high capacity while making it easier to remove the generated heat, and the thickness is smaller, reducing the risk of tearing of the electrode tab 21 of the electrode assembly 2 and improving the safety of the battery monomer 10.

[0080] Please refer to Figure 5 , Figure 5 is a schematic view of the electrode assembly 2 provided by some embodiments of the application. In some embodiments, the electrode assembly 2 can further include a positive electrode tab 22 and a negative electrode tab 23, and a separator 4 disposed between the positive electrode tab 22 and the negative electrode tab 23. The electrode assembly 2 can adopt a winding structure, and the positive electrode tab 22, the separator 24 and the negative electrode tab 23 are stacked and wound to form a winding structure. Understandably, the winding structure is compact and has high space utilization, which helps to improve the energy density of the battery monomer 10. At the same time, the winding structure can also alleviate the expansion and contraction problem of the electrode material to some extent, and improve the cycle life of the battery monomer 10.

[0081] Please refer to Figure 4 , the insulating member 5 is a member that is substantially or cannot conduct electricity under the normal use environment of the battery monomer 10, which can isolate between the electrode assembly 2 and the shell 11, form a protective barrier for insulating and isolating the electrode assembly 2 and the shell 11, and reduce the possibility of forming a conductive loop between the electrode assembly 2 and the shell 11.

[0082] The insulating member 5 can be formed with a plurality of accommodating cavities 51, and the plurality of accommodating cavities 51 can be arranged and disposed in the thickness direction of the battery monomer 10, and each accommodating cavity 51 can accommodate at least one electrode assembly 2. The electrode assembly 2 can be partially located in the accommodating cavity 51, or can be entirely located in the accommodating cavity 51. When the electrode assembly 2 is partially located in the accommodating cavity 51, the electrode tab 21 of the electrode assembly 2 extends from the accommodating cavity 51 to the end cover 12.

[0083] The number of accommodating cavities 51 can be 2, 3, 4 or even more, and each accommodating cavity 51 can accommodate 1, 2, 3 or even more electrode assemblies 2. The number of electrode assemblies 2 accommodated by different accommodating cavities 51 can be the same or different. The accommodating cavities 51 can be hollow structures with one end open, or hollow structures with opposite ends open. The accommodating cavities 51 can be oriented towards the end cover 12. The accommodating cavities 51 can have various shapes, such as cylindrical or cuboid. For example, in one example, the electrode assemblies 2 include 2, and the insulating member 5 is formed with 2 accommodating cavities 51, each accommodating one electrode assembly 2. For another example, in one example, the electrode assemblies 2 include 3, and the insulating member 5 is formed with 2 accommodating cavities 51, one accommodating one electrode assembly 2 and the other accommodating two electrode assemblies 2.

[0084] The arrangement of multiple accommodating cavities 51 can facilitate the modular design of the battery monomer 10. Each accommodating cavity 51 can be regarded as an independent module unit, and the modular design makes it easier to replace and maintain individual electrode assemblies 2. When necessary, the damaged electrode assemblies 2 can be individually removed and replaced without disassembling the entire battery monomer 10.

[0085] Further, the insulating member 5 has high flame retardant properties and can withstand high temperatures of more than 300 degrees Celsius. Since the electrode assemblies 2 are located in the accommodating cavities 51 formed by the insulating member 5, the presence of the insulating member 5 effectively isolates each electrode assembly 2. Even if one of the electrode assemblies 2 experiences thermal runaway due to factors such as internal short circuit, overcharge, etc., the release of heat and harmful gases will be limited within the current accommodating cavity 51, greatly reducing the risk of thermal runaway spreading to other electrode assembly 2 structures. The high thermal resistance of the insulating member 5 prolongs the time for heat to spread from the runaway electrode assembly 2 to the adjacent electrode assembly 2, thereby reducing the instantaneous heat production and gas production, allowing the high-temperature gas to gradually discharge from the explosion-proof valve. In this way, on the one hand, the risk of thermal runaway spreading in the battery monomer 10 is reduced, improving the safety of the battery monomer 10. On the other hand, more reaction time is provided for the staff to take safety measures such as cutting off the power supply, etc.

[0086] For further reference Figure 4 In some embodiments, the insulating member 5 is provided with through holes 52 communicating with the accommodating cavities 51.

[0087] The through hole 52 can effectively facilitate the dissipation of heat from the accommodation cavity 51 to the outside, reduce the accumulation of heat generated by the battery during charging and discharging, and improve the thermal management efficiency of the battery monomer 10. Moreover, the design of the through hole 52 also allows the electrolyte to flow more freely within the shell 11, which helps to ensure that the electrode assembly 2 is fully soaked with electrolyte. The electrode assembly 2 soaked well can more effectively perform electrochemical reactions, improve the energy conversion efficiency and performance of the battery monomer 10, and reduce the internal resistance and polarization phenomenon of the battery, thereby improving the discharge capacity, cycle stability and rate performance of the battery monomer 10.

[0088] In one embodiment, in the case of thermal runaway, a large amount of high-temperature gas and harmful substances will be generated inside the battery monomer 10. The through hole 52 can act as an exhaust passage to make these gases faster along the explosion-proof valve to the outside of the battery. This helps to reduce the pressure accumulation inside the battery and prevent the battery from exploding and other serious consequences. The design of the through hole 52 as a rapid exhaust passage can significantly reduce the damage of high-temperature gas and harmful substances to the electrode assembly 2, and help to improve the safety of the battery monomer 10, protecting the safety of personnel and property.

[0089] Please refer to Figure 3 In some embodiments, the through hole 52 includes a plurality of through holes 52 arranged along the first direction Z. The first direction Z is the opening direction of the accommodation cavity 51 or the height direction of the battery monomer 10.

[0090] The plurality of through holes 52 are arranged along the opening direction of the accommodation cavity 51, which helps to form a more uniform and efficient flow path for the electrolyte inside the battery cell. This not only ensures that the electrode assembly 2 of different heights is fully soaked, but also reduces the resistance and energy consumption of the electrolyte during flow.

[0091] In the case of thermal runaway, the plurality of through holes 52 act as exhaust passages to quickly release the high-temperature gas and harmful substances accumulated inside the battery. The array arrangement ensures that the gas can be quickly discharged in multiple directions, reducing the risk of local pressure being too high, thereby improving the safety of the battery monomer 10. In addition, the array design of the through hole 52 also helps to evenly distribute the heat inside the battery monomer 10. During charging and discharging, the battery monomer 10 will generate some heat. The through hole 52 can act as a heat transfer channel to facilitate the uniform diffusion of heat inside the battery monomer 10, preventing the occurrence of local overheating.

[0092] In some embodiments, the through hole 52 is at least one of a circle, an ellipse, and a polygon.

[0093] In the design of the insulating piece 5, the shape of the through hole 52 can be diversified to meet different performance and safety requirements. The through hole 52 is at least one of circular, elliptical, or polygonal (such as rectangular, triangular, etc.), each shape has its unique advantages and applicable scenarios.

[0094] The circular through hole has a uniform geometry, which can provide a smooth electrolyte flow path and reduce flow resistance. At the same time, the circular through hole can uniformly distribute stress when subjected to pressure, reducing the risk of material cracking. In addition, the circular through hole is relatively simple to process, with lower manufacturing costs, suitable for battery monomer 10 designs that have higher requirements for electrolyte flowability and processing costs.

[0095] The elliptical through hole provides more space in the length direction, which is beneficial for the rapid flow of electrolyte in a specific direction. At the same time, the elliptical through hole still maintains a certain stability in the width direction, which can withstand a certain mechanical stress, suitable for battery monomer 10 designs that need to optimize the flow performance of electrolyte in a specific direction, such as long strip-shaped cells.

[0096] The polygonal through hole has clear corners and straight boundaries, which is convenient for positioning and processing during manufacturing. At the same time, the polygonal through hole can be adjusted in shape according to specific requirements to optimize electrolyte flow, heat transfer, or exhaust performance. Suitable for battery monomer 10 designs that have specific requirements for the shape of the through hole 52 or need to optimize multiple performance. For example, rectangular through holes may be more suitable for scenarios that require uniform heat distribution; while triangular through holes may be more suitable for scenarios that require enhanced exhaust effect.

[0097] In addition, the through hole 52 can also be other regular or irregular patterns. That is, the specific shape of the through hole 52 is not limited. It can be set according to actual needs.

[0098] In some embodiments, the thickness of the insulating piece 5 ranges from 0.05 to 0.5 millimeters.

[0099] Thinner insulating piece 5 can reduce the overall weight and volume of the battery monomer 10, improve energy density. However, an excessively thin film may not be able to provide sufficient insulation and heat insulation effect, increasing the risk of short circuit and overheating. Thicker insulating piece 5 can provide better insulation and heat insulation effect, but will increase the weight and volume of the battery monomer 10, reduce the energy density. The thickness of the insulating piece 5 will also affect its manufacturing cost. Thinner films can reduce material costs and processing difficulty, but may require more delicate manufacturing processes to ensure their performance.

[0100] The thickness of the insulating member 5 needs to be matched with other components of the battery cell 10 to ensure a tight fit and good sealing therebetween. At the same time, the feasibility and stability of the manufacturing process also need to be considered. An appropriate thickness can ensure that the insulating member 5 can effectively isolate the fire source and high-temperature gas when the battery cell 10 experiences abnormal conditions such as thermal runaway or short circuit, preventing the spread of fire and explosion.

[0101] Taking into account the above various factors, the thickness of the insulating member 5 ranges from 0.05 to 0.5 millimeters. For example, the thickness of the insulating member 5 can be 0.05 millimeters, 0.1 millimeters, 0.15 millimeters, 0.2 millimeters, 0.25 millimeters, 0.3 millimeters, 0.35 millimeters, 0.4 millimeters, 0.45 millimeters, or 0.5 millimeters. This range is a relatively reasonable choice, which can meet the performance and safety requirements of the battery cell 10, and achieve a balance in terms of manufacturing cost and process feasibility.

[0102] In this way, by limiting the thickness of the insulating member 5, the performance and safety requirements of the battery cell 10 can be met, and a balance can be achieved in terms of manufacturing cost and process feasibility.

[0103] In some embodiments, the thickness of the insulating member 5 ranges from 0.1 to 0.3 millimeters.

[0104] For example, the thickness of the insulating member 5 can be 0.1 millimeters, 0.15 millimeters, 0.2 millimeters, 0.25 millimeters, or 0.3 millimeters. The thickness range of 0.1 to 0.3 millimeters can achieve a good balance between insulation performance, heat insulation performance, and mechanical support. This thickness can effectively prevent short circuit and provide certain heat insulation effect, while not excessively increasing the weight and volume of the battery cell 10. Within this thickness range, the insulating member 5 can quickly respond and isolate the fire source and high-temperature gas when the battery cell 10 experiences abnormalities such as thermal runaway or short circuit, thereby slowing down the spread of fire and improving the safety of the battery cell 10.

[0105] In some embodiments, the insulating member 5 is made of at least one material of a polyimide film or a mica film.

[0106] It should be noted that the polyimide (PI) film is a high-performance insulating material with excellent low and high temperature resistance, chemical corrosion resistance, high mechanical strength and good electrical insulation performance. Its heat resistance temperature can be greater than 400 degrees Celsius. Therefore, the polyimide film as the insulating piece 5 can effectively play a heat insulation role and maintain stable performance in a high temperature environment to improve the safety of the battery monomer 10. Mica is a natural layered silicate mineral with extremely high heat resistance and insulation. The mica film has excellent insulation performance, strong corrosion resistance and is easy to process and shape. In addition, the mica film has high thermal stability and can maintain its structure and performance in a high temperature environment, and can withstand high temperatures of 600-800℃. Therefore, the mica film as the insulating piece 5 can effectively reduce the transfer and accumulation of heat and maintain the stability of the internal temperature of the battery monomer 10.

[0107] In some embodiments, at least part of the accommodation cavity 51 is filled with a flame-retardant material.

[0108] Specifically, the flame-retardant material may, for example, be an aerogel felt material, a flame-retardant foam material or an inorganic coating material, which has a low thermal conductivity and can effectively slow down the transfer of heat between adjacent accommodation cavities 51, helping to reduce the impact of thermal runaway events on other electrode assemblies 2 and prevent the occurrence of chain reactions.

[0109] In this way, in addition to the heat insulation performance of the insulating piece 5 itself, the flame-retardant material also provides an additional heat insulation layer, which can quickly respond to and prevent the spread of fire, helping to further reduce the speed of heat transfer inside the battery monomer 10, prolong the development time of thermal runaway events, and reduce the impact of thermal runaway events on the entire battery system.

[0110] Please refer to Figure 4 , Figure 6 and Figure 7 , in some embodiments, the insulating piece 5 includes a plurality of main covering sheets 53, a plurality of side covering sheets 54 and an inner covering sheet 55, two sides of each main covering sheet 53 are connected with one side covering sheet 54 respectively, and the main covering sheets 53 and the side covering sheets 54 together enclose a receiving space, and the inner covering sheet 55 is located in the receiving space to divide the receiving space into at least two accommodation cavities.

[0111] Specifically, the shell 1 can be rectangular, and the insulating piece 5 can include two main covering sheets 53, two side covering sheets 54 and one or more inner covering sheets 55, wherein the two main covering sheets 53 are arranged opposite to each other along a second direction X, the two side covering sheets 54 are arranged opposite to each other along a third direction Y, the second direction X and the third direction Y are coplanar and perpendicular to each other, and the second direction X can be the thickness direction of the battery monomer 10 and the third direction Y can be the length direction of the battery monomer 10. Two sides of each main covering sheet 53 are connected with two side covering sheets 54 to together enclose a large receiving space.

[0112] The inner covering sheet 55 is located in the accommodation space and is arranged in parallel with the main covering sheet 53 and / or the side covering sheet 54, separating the accommodation space to form at least two containing cavities 51. It can be understood that the number of containing cavities 51 is related to the number of inner covering sheets 55. When there is one inner covering sheet 55, the inner covering sheet 55 separates the accommodation space to form two containing cavities 51. When there are two inner covering sheets 55, the inner covering sheets 55 separate the accommodation space to form three containing cavities 51. When there are three inner covering sheets 55, the inner covering sheets 55 separate the accommodation space to form four containing cavities 51. Each containing cavity 51 is used to accommodate at least one electrode assembly 2. The main covering sheet 53 and the side covering sheet 54 are used to isolate the battery monomer 10 from the inner wall of the shell 11. The inner covering sheet 55 is used to isolate the electrode assembly 2 from the electrode assembly 2.

[0113] In this way, through the arrangement of the main covering sheet 53, the side covering sheet 54 and the inner covering sheet 55, a plurality of containing cavities 51 can be formed, so that each electrode assembly 2 is independently covered in the containing cavity 51. Therefore, even if thermal runaway occurs, its impact will be limited within the current containing cavity 51, greatly reducing the risk of chain thermal runaway of the entire battery monomer 10. By reducing the impact of thermal runaway events on the battery monomer 10, this design helps to prolong the overall service life of the battery monomer 10 and improve the economy and reliability of the battery monomer 10.

[0114] For further reference Figure 4 In some embodiments, the area of the main covering sheet 53 is greater than the area of the side covering sheet 54.

[0115] Specifically, the main covering sheet 53 can be the largest area in the insulating piece 5, the main covering sheet 53 is arranged opposite to the main surface of the shell 11, used to block the direct contact between the electrode assembly 2 and the main surface of the shell 11, to protect the main surface of the shell 11 from being damaged. The side covering sheet 54 is arranged opposite to the side surface of the shell 11, used to block the direct contact between the electrode assembly 2 and the side surface of the shell 11. The area of the main surface of the shell 11 is greater than the area of the side surface of the shell 11. The through hole 52 can be provided on the side covering sheet 54.

[0116] The arrangement of the main covering sheet 53 perpendicular to the second direction X helps to provide additional support and protection when the battery monomer 10 is subjected to lateral impact. The larger area of the main covering sheet 53 and the perpendicular arrangement make the battery monomer 10 more structurally stable and able to withstand greater mechanical stress and vibration impact.

[0117] In one embodiment, in the case of thermal runaway, the main covering sheet 53 and the side covering sheet 54 together form an effective thermal barrier, making the spread of heat and harmful gases more difficult, so that the impact of the thermal runaway event is limited to a smaller range.

[0118] Referring to Figure 6 Or Figure 7 In some embodiments, the side cover sheet 54, the main cover sheet 53 and the inner cover sheet 55 are made by an integral molding process.

[0119] Thus, the integral molding process can ensure that the connection between the components is more secure, reduce structural weaknesses caused by separate assembly, and improve overall structural strength. Compared with the traditional separate assembly method, the integral molding process can greatly reduce the assembly process and the number of parts, reduce production cost and assembly time.

[0120] The second aspect of the application provides a battery cell.

[0121] Other configurations and operations of the battery according to the embodiments of the present application are known to those skilled in the art and will not be described in detail here.

[0122] The third aspect of the application provides a power-consuming device, which includes the battery of the second aspect of the application, and the battery is used to provide power for the power-consuming device.

[0123] Other configurations and operations of the power-consuming 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.

[0124] The fourth aspect of the application provides an energy storage device, which includes the battery of the second aspect of the application, and the battery is used to provide power for the energy storage device.

[0125] Specifically, the energy storage device includes one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of batteries connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device. The battery can include one or more battery cell assemblies to provide voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or hybrid connection through a busbar component. In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0126] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device can store electric energy during a low electricity consumption period and provide electric energy for relevant users or electric devices during a high electricity consumption period. The energy storage device provided in the embodiments of the present application can be used in any power system requiring an energy storage device.

[0127] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0128] In some embodiments, the energy storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0129] In some embodiments, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module, and a fire-fighting module, etc.

[0130] As an example, the thermal management module can include a liquid cooling unit, and the liquid cooling unit provides a cooling liquid for adjusting the temperature of the battery monomer to each battery through a pipeline.

[0131] As an example, the master control module can be a battery management unit of the battery cluster, and is used for monitoring and managing the battery cluster. The master control module can monitor the current, voltage, power, or temperature, etc. of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch, etc.

[0132] As an example, the general control module can be a battery management unit of the energy storage device, and is used for monitoring and managing the energy storage device. The general control module can monitor the current, voltage, power, state of charge, or temperature, etc. of the energy storage device. For example, the charging and discharging current and voltage of the energy storage device can be controlled. As an example, the general control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) and fiber conversion module, etc.

[0133] As an example, the fire-fighting system includes a control panel, a detector, an alarm device, etc., and is used for detecting, alarming, or extinguishing the energy storage device.

[0134] As an example, the power distribution device can be used for power distribution to the power consumption module of the energy storage device.

[0135] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently; 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 specification of the present application. In particular, 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 herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: case; An electrode assembly, housed within the housing, wherein at least two electrode assemblies are provided; An insulating element is disposed between the electrode assembly and the housing, the insulating element forming at least two receiving cavities, each receiving cavity accommodating at least one of the electrode assemblies, and the insulating element having a heat resistance temperature greater than 300 degrees Celsius.

2. The battery cell according to claim 1, characterized in that, The insulating component has a through hole that connects to the receiving cavity.

3. The battery cell according to claim 2, characterized in that, The through holes include multiple through holes, which are arranged in an array along a first direction, which is the opening direction of the receiving cavity.

4. The battery cell according to claim 3, characterized in that, The through hole is at least one of the following: circular, elliptical, or polygonal.

5. The battery cell according to any one of claims 1-4, characterized in that, The thickness of the insulating component ranges from 0.05 to 0.5 mm.

6. The battery cell according to claim 5, characterized in that, The thickness of the insulating component ranges from 0.1 to 0.3 mm.

7. The battery cell according to claim 6, characterized in that, The insulating element is made of at least one material selected from polyimide film or mica film.

8. The battery cell according to claim 1, characterized in that, At least a portion of the cavity is filled with flame retardant.

9. The battery cell according to claim 1, characterized in that, The insulating element includes multiple side coverings, multiple main coverings, and an inner covering. Each main covering is connected to one side covering on each side, and together they form a receiving space. The inner covering is located within the receiving space to divide the receiving space into at least two receiving cavities.

10. The battery cell according to claim 9, characterized in that, The area of ​​the main coating sheet is larger than the area of ​​the side coating sheet. The main coating sheet is perpendicular to the second direction, and the side coating sheet is parallel to the third direction. The second direction intersects the third direction, and the second direction is the thickness direction of the electrode unit.

11. The battery cell according to claim 9, characterized in that, The side covering sheet, the main covering sheet, and the inner covering sheet are manufactured using an integral molding process.

12. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-11.

13. An electrical appliance, characterized in that, Includes the battery as described in claim 12, the battery being used to provide electrical energy to the electrical device.

14. An energy storage device, characterized in that, Includes the battery as described in claim 12.

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