Battery, energy storage device, and electric device

Abstract

A battery (100), an energy storage device, and an electric device. The battery (100) comprises a battery case (10), at least one first battery cell (1), and at least one second battery cell (2); the battery case (10) comprises an upper case plate (1011) and a lower case plate (1021), the upper case plate (1011) is arranged above the lower case plate (1021) and an accommodating space is provided therebetween; the first battery cell (1) and the second battery cell (2) are both arranged in the accommodating space, the first battery cell (1) is arranged closer to the lower case plate (1021) than the second battery cell (2), the second battery cell (2) is arranged closer to the upper case plate (1011) than the first battery cell (1), the first battery cell (1) is a sodium-ion battery, and the second battery cell (2) is a lithium-ion battery.

Description

Battery, energy storage device and electric device

[0001] Cross-reference to Related Applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202421454316.3, filed on June 24, 2024, entitled “Battery, Energy Storage Device and Electric Device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery, an energy storage device and an electric device. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like. In new energy vehicles equipped with batteries, the batteries can be used to provide all or part of the power. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side.

[0005] The charge and discharge capacity of a battery can be affected in a low temperature environment. How to improve the charge and discharge capacity of a battery in a low temperature environment is one of the subjects that the industry needs to study.

[0006] Practical new type content

[0007] To solve the above technical problems, the present disclosure provides a battery, an energy storage device and an electric device with high charge and discharge capacity.

[0008] The present disclosure is implemented by the following technical solutions.

[0009] The first aspect of the present disclosure provides a battery, comprising a battery box, having an upper box plate and a lower box plate, the upper box plate is arranged above the lower box plate, and a containing space is arranged between the two; at least one first battery monomer and at least one second battery monomer, both of which are arranged in the containing space, the first battery monomer is arranged close to the lower box plate relative to the second battery monomer, and the second battery monomer is arranged close to the upper box plate relative to the first battery monomer, the first battery monomer adopts a sodium ion battery, and the second battery monomer adopts a lithium ion battery.

[0010] In the case that the battery provided by the present disclosure is installed in an electric vehicle, the lower box plate is closer to the external environment (the space below the electric vehicle) than the upper box plate, so that the first battery monomer close to the lower box plate is closer to the external environment than the second battery monomer, the first battery monomer is more susceptible to the temperature of the external environment, the temperature of the first battery monomer is relatively low when the external environment is a low-temperature environment, and the temperature of the second battery monomer is relatively high. The first battery monomer adopts a sodium-ion battery, the second battery monomer adopts a lithium-ion battery, and because the low-temperature capacity retention rate of the sodium-ion battery is higher than that of the lithium-ion battery, that is, the low-temperature capacity retention rate of the first battery monomer is higher than that of the second battery monomer. Therefore, the influence of low temperature on the charge-discharge capacity of the first battery monomer is relatively small, so that the first battery monomer can also maintain a relatively high charge-discharge capacity in a low-temperature state. Moreover, because the temperature of the second battery monomer is relatively high, even if the low-temperature capacity retention rate of the second battery monomer is low, the influence on its charge-discharge capacity is also relatively small, that is, the charge-discharge capacity of the second battery monomer is also relatively high, so that the battery including the first battery monomer and the second battery monomer also has a relatively high charge-discharge capacity in a low-temperature environment. Furthermore, because the influence of low temperature on the charge-discharge capacity of the first battery monomer is relatively small, the difference in charging capacity between the first battery monomer and the second battery monomer is relatively small, which can reduce the probability of lithium precipitation of the first battery monomer.

[0011] In some embodiments, the second battery monomer adopts a lithium iron phosphate battery or a ternary lithium battery.

[0012] Both the lithium iron phosphate battery and the ternary lithium battery have the characteristic of high energy density. Therefore, the adoption of the lithium iron phosphate battery or the ternary lithium battery as the second battery monomer is beneficial to improve the overall energy density of the battery and is more beneficial to improve the overall charge-discharge capacity of the battery.

[0013] In some embodiments, the second battery monomer is arranged on the first surface of the first battery monomer, the first surface is perpendicular to the first direction, and the first battery monomer is arranged along the first direction and / or is arranged along a second direction perpendicular to the first direction.

[0014] In this way, by arranging a plurality of first battery monomers on the first surface of the first battery monomer, the charge-discharge capacity of the entire battery is increased.

[0015] In some embodiments, the first battery monomer includes a first shell and a first electrode assembly, the first electrode assembly is arranged in the first shell, and the first surface is the surface with the largest area of the first shell.

[0016] The first surface is a surface with the largest area of the first shell, so that the first battery monomer has a larger area between the external environment and the second battery monomer, so that more second battery monomers can be arranged, thereby increasing the charging and discharging capacity of the entire battery.

[0017] In some embodiments, the ratio of the area of the first surface to the size of the first shell in the first direction is not less than 480.

[0018] In this way, the first battery monomer is more flat, and the first surface of the first battery monomer with the same volume size has a larger area, so that the first battery monomer has a larger area between the external environment and the second battery monomer, so that more second battery monomers can be arranged, thereby increasing the charging and discharging capacity of the entire battery.

[0019] In some embodiments, the first shell is an aluminum shell and / or a steel shell.

[0020] The first shell is an aluminum shell and / or a steel shell, so that the first shell is a hard shell, and the first battery monomer is a hard shell battery monomer. In this way, the first shell has a certain hardness and strength, and the first shell is not easy to deform when subjected to extrusion and collision, so that the first battery monomer can have higher structural strength, and the safety performance can also be improved.

[0021] In some embodiments, the first shell has a surface perpendicular to the first direction and opposite to the first surface in the first direction, the first shell also has two surfaces perpendicular to the second direction and opposite to each other in the second direction, and the first shell also has two surfaces perpendicular to the third direction and opposite to each other in the third direction. The first direction and the second direction are perpendicular to the third direction.

[0022] In this way, the first shell is formed into a cubic shell, which facilitates the assembly of the second battery monomers on the first battery monomer and improves the structural reliability of the group of the second battery monomers and the first battery monomer.

[0023] In some embodiments, the size of the first shell in the third direction is greater than the size in the second direction, the size of the first shell in the second direction is greater than the size in the first direction, and the second battery monomers are arranged along the first direction; or, the second battery monomers are arranged along the second direction; or, the second battery monomers are arranged along the third direction.

[0024] In this way, the size of the first shell in the third direction is the length of the first shell, the size of the first shell in the second direction is the width of the first shell, and the size of the first shell in the third direction is the thickness of the first shell. The second battery monomers are arranged in multiple, thereby improving the battery capacity of the entire battery.

[0025] In some embodiments, the first shell is an aluminum plastic film.

[0026] Thus, the first shell adopts an aluminum plastic film, so that the first battery cell is a soft-pack battery cell, and the energy density of the soft-pack battery cell is high, thereby improving the energy density of the battery.

[0027] In some embodiments, the second battery cell comprises a second shell, a second electrode assembly arranged in the second shell, and a second pole arranged on the second shell, the second pole being connected to the second electrode assembly.

[0028] Thus, the second battery cell forms a basic unit capable of realizing mutual conversion between chemical energy and electrical energy. Moreover, since the low-temperature capacity retention rate of the first battery cell is high, the first battery cell can maintain a high charge-discharge capacity in a low-temperature state, and due to the barrier of the first battery cell, the temperature of the second battery cell is less affected by the external low-temperature environment, that is, the temperature of the second battery cell is relatively high. Thus, even if the low-temperature capacity retention rate of the second battery cell is low, the charge-discharge capacity of the second battery cell is less affected, that is, the charge-discharge capacity of the second battery cell is also relatively high, so that the battery comprising the first battery cell and the second battery cell also has a high charge-discharge capacity in a low-temperature environment.

[0029] In some embodiments, the second shell is a cubic shell comprising two opposite second surfaces, the second surface being the surface with the largest area of the second shell, and the second battery cell is arranged along a direction perpendicular to the second surface.

[0030] Thus, the second battery cell is a square shell battery, the second battery cells are arranged along the thickness direction thereof, and the structural strength of the group of second battery cells is high, thereby improving the structural strength of the battery.

[0031] In some embodiments, the second surface is perpendicular to the first direction; or, the second surface is perpendicular to the second direction; or, the second surface is perpendicular to the third direction, and the first direction and the second direction are both perpendicular to the third direction.

[0032] Thus, the plurality of second battery cells are arranged along the first direction, or along the second direction, or along the third direction, so that the battery comprises a plurality of second battery cells, thereby increasing the battery capacity of the battery.

[0033] In some embodiments, the first surface is rectangular, the extension direction of the short side of the first surface is consistent with the second direction, the extension direction of the long side of the first surface is consistent with the third direction which is perpendicular to both the first direction and the second direction, the second shell is a cylindrical shell, and the central axis of the second shell of the second battery cell extends along the third direction.

[0034] Thus, the second battery cell is a cylindrical battery, and the axial direction of the second battery cell is consistent with the length direction of the first battery cell, which is conducive to improving the bending strength of the battery along the third direction, thereby improving the structural strength of the battery.

[0035] In some embodiments, the second battery cells are arranged along the second direction.

[0036] Thus, the second battery cells are arranged along the second direction, so that a plurality of second battery cells are arranged on the first surface of the first battery cell, thereby improving the battery capacity of the battery.

[0037] In some embodiments, the second battery cells are arranged in at least two columns along the first direction, the second battery cells in adjacent two columns are arranged staggered along the first direction, and the second battery cells in odd-numbered columns are aligned along the first direction, and the second battery cells in even-numbered columns are aligned along the first direction.

[0038] By arranging the second battery cells in adjacent columns staggered, the second battery cells in one column are accommodated in the recessed space formed between two adjacent second battery cells in another column, the space is arranged reasonably, which not only saves the space occupation, but also improves the reliability of the second battery cells in groups, thereby improving the structural strength of the battery.

[0039] The second aspect of the present disclosure provides an energy storage device comprising at least one battery as described above.

[0040] Since the energy storage device comprises the battery, the energy storage device has all the beneficial effects of the battery, and thus the charge and discharge capacity of the energy storage device is improved and the probability of lithium precipitation is low.

[0041] The third aspect of the present disclosure provides an electric device comprising the battery for providing electric energy.

[0042] Since the electric device comprises the battery, the electric device has all the beneficial effects of the battery, and thus the charge and discharge capacity of the electric device is improved and the probability of lithium precipitation is low.

[0043] Practical new type effect

[0044] Through the present disclosure, a battery, an energy storage device and an electric device with high charge and discharge capacity can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not considered a limitation of the present disclosure. Moreover, like reference numerals in the attached figures are intended to represent the same parts throughout the figures. In the drawings:

[0046] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present disclosure;

[0047] FIG. 2 is a perspective exploded schematic diagram of a battery according to some embodiments of the present disclosure;

[0048] FIG. 3 is a partial perspective structural schematic diagram of a first structure of a battery according to some embodiments of the present disclosure;

[0049] FIG. 4 is a perspective structural schematic diagram of a first structure of a battery module according to some embodiments of the present disclosure;

[0050] FIG. 5 is a perspective structural schematic diagram of another view of the first structure of the battery module according to some embodiments of the present disclosure;

[0051] FIG. 6 is a front view of the first structure of the battery module according to some embodiments of the present disclosure;

[0052] FIG. 7 is a perspective structural schematic diagram of a first battery cell according to some embodiments of the present disclosure;

[0053] FIG. 8 is a perspective exploded diagram of the first battery cell according to some embodiments of the present disclosure;

[0054] FIG. 9 is a perspective structural schematic diagram of a second battery cell according to some embodiments of the present disclosure;

[0055] FIG. 10 is a perspective exploded diagram of the second battery cell according to some embodiments of the present disclosure;

[0056] FIG. 11 is a partial perspective structural schematic diagram of a second structure of a battery according to some embodiments of the present disclosure;

[0057] FIG. 12 is a perspective structural schematic diagram of one view of the second structure of the battery module according to some embodiments of the present disclosure;

[0058] FIG. 13 is a perspective structural schematic diagram of another view of the second structure of the battery module according to some embodiments of the present disclosure;

[0059] FIG. 14 is a top view of the second structure of the battery module according to some embodiments of the present disclosure;

[0060] FIG. 15 is a perspective structural schematic diagram of a third structure of a battery module according to some embodiments of the present disclosure;

[0061] FIG. 16 is a front view of the third structure of the battery module according to some embodiments of the present disclosure;

[0062] FIG. 17 is a side view of the third structure of the battery module according to some embodiments of the present disclosure;

[0063] FIG. 18 is a top view of a third structure of a battery module according to some embodiments of the present disclosure.

[0064] Explanation of Reference Numerals 1000 vehicle; 100 battery; 200 controller; 300 motor; 10 battery case; 101 case cover; 1011 upper case plate; 102 case body; 1021 lower case plate; 20 battery module; 1 first battery cell; 11 first housing; 111 first end cover; 112 first case; 113 first surface; 12 first electrode assembly; 13 first pole; 2 second battery cell; 21 second housing; 211 second end cover; 22 second electrode assembly; 221 second end cover; 212 second case; 213 second surface; 23 second pole; 24 second pressure relief mechanism. DETAILED DESCRIPTION

[0065] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this present disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure; the terms "include" and "have" and any variations thereof used in the specification and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0067] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like 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 disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0068] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0069] In the description of the embodiments of the present disclosure, 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, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents the "or" relationship between the front and rear associated objects.

[0070] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed, operated, or used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0071] In the description of the embodiments of the present disclosure, unless explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing", and the like should be understood broadly, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0072] In the description of the embodiments of the present disclosure, unless explicitly specified and limited, the technical term "contact" should be understood broadly, which can be direct contact, or contact through an intermediate medium layer, which can be contact between two elements in contact without interaction force, or contact between two elements in contact with interaction force.

[0073] The present disclosure will be described in detail below.

[0074] At present, new energy batteries are increasingly widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind, and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles, and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0075] The battery mentioned in the embodiments of the present disclosure can include two or more battery monomers to provide a single physical module with higher voltage and capacity. The plurality of battery monomers are connected in series, parallel, or mixed connection through a busbar component.

[0076] In some embodiments, the battery can be a battery module, and when there are a plurality of battery monomers, the plurality of battery monomers are arranged and fixed to form a battery module.

[0077] In some embodiments, the battery can be a battery pack, and the battery pack includes a battery box and a battery monomer, and the battery monomer or the battery module is contained in the box.

[0078] In some embodiments, the battery box can be part of the chassis structure of the vehicle. For example, part of the battery box can be part of the floor of the vehicle, or part of the battery box can be part of the cross beam and the longitudinal beam of the vehicle.

[0079] In some embodiments, the plurality is more than two.

[0080] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0081] The inventors of the present disclosure have found that the plurality of battery cells in the battery commonly used to power electric vehicles use the same type of battery cell, that is, the low-temperature capacity retention rate of the plurality of battery cells is the same. When the external environment is a low-temperature environment, the temperature of the battery cell far from the external environment is higher, and the battery capacity can be better. That is, the charge and discharge capacity of the battery cell far from the external environment is higher, while the temperature of the battery cell close to the external environment is lower. The low temperature affects the normal performance of the battery capacity, so that the charge and discharge capacity of the low-temperature battery cell is smaller, thereby affecting the charge and discharge capacity of the entire battery. Moreover, the temperature difference between the battery cells is large, the polarization degree of the battery cells is different, and the charging capacity difference is too large, which easily causes the low-temperature battery cell to undergo lithium precipitation.

[0082] The inventors of the present disclosure have found that, instead of the conventional combination of the same type of battery cell in the same battery, a combination of different types of battery cells is used, and the low-temperature capacity retention rate of the battery cell close to the external environment is higher than that of the battery cell far from the external environment. The influence of the external temperature on the charge and discharge capacity of the battery cell close to the external environment is reduced, that is, the low-temperature battery cell can better perform its battery capacity, thereby facilitating the improvement of the charge and discharge capacity of the entire battery. Moreover, since the low temperature has less influence on the charge and discharge capacity of the battery cell close to the external environment, the charging capacity difference between the different types of battery cells is small, thereby reducing the probability of lithium precipitation of the low-temperature battery cell.

[0083] Based on such a design concept, the inventors of the present disclosure have designed a battery comprising a battery box and at least one first battery cell and at least one second battery cell. The battery box has an upper box plate and a lower box plate, the upper box plate is arranged above the lower box plate, and a containing space is arranged between the two. The at least one first battery cell and the at least one second battery cell are arranged in the containing space. The first battery cell is arranged close to the lower box plate relative to the second battery cell, and the second battery cell is arranged close to the upper box plate relative to the first battery cell. The first battery cell uses a sodium-ion battery, and the second battery cell uses a lithium-ion battery.

[0084] The first battery cell adopts a sodium-ion battery, and the second battery cell adopts a lithium-ion battery. Since the low-temperature capacity retention rate of the sodium-ion battery is higher than that of the lithium-ion battery, the low-temperature capacity retention rate of the first battery cell is higher than that of the second battery cell. In the case that the battery provided by the present disclosure is installed in an electric vehicle, the lower box plate is closer to the external environment (the space below the electric vehicle) than the upper box plate, so that the first battery cell close to the lower box plate is closer to the external environment than the second battery cell. When the external environment is a low-temperature environment, the temperature of the first battery cell is relatively low, but since the low-temperature capacity retention rate of the first battery cell is relatively high, the low temperature has a relatively small impact on the charge-discharge capacity of the first battery cell. Therefore, the first battery cell can also maintain a relatively high charge-discharge capacity in a low-temperature state. In addition, since the second battery cell is relatively far from the external environment, its temperature is less affected by the low-temperature external environment, that is, the temperature of the second battery cell is relatively high. In this way, even if the low-temperature capacity retention rate of the second battery cell is relatively low, the impact on its charge-discharge capacity is also relatively small, that is, the charge-discharge capacity of the second battery cell is also relatively high. Therefore, the battery including the first battery cell and the second battery cell also has a relatively high charge-discharge capacity when used in a low-temperature environment.

[0085] The battery provided by the embodiments of the present disclosure can be used in energy storage devices or electric devices, but is not limited to this. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, etc. The electric device can be, but is not limited to, a vehicle, a ship or an aircraft, etc. For example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc. As long as the energy storage device or the electric device is in use, the lower box plate is closer to the external environment than the upper box plate, so as to improve the charge-discharge capacity.

[0086] In the following embodiments, for the convenience of description, the electric device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described in conjunction with the accompanying drawings.

[0087] FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid electric vehicle, or a range extended electric vehicle, etc. As shown in FIG. 1, 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. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0088] In some embodiments of the present disclosure, 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.

[0089] FIG. 2 is a perspective exploded schematic diagram of the battery 100 according to some embodiments of the present disclosure. As shown in FIG. 2, the battery 100 includes a battery box 10 and at least one battery module 20, the battery box 10 being internally provided with an accommodating space, and the at least one battery module 20 being accommodated in the accommodating space.

[0090] In some embodiments of the present disclosure, the battery box 10 includes a box body 102 and a box cover 101, the box cover 101 being covered above the box body 102, so as to form the accommodating space between the box body 102 and the box cover 101.

[0091] The box body 102 can be a hollow structure with one end being open, and the box cover 101 can be a plate-shaped structure, the box cover 101 being combined with the open side of the box body 102, so that the box cover 101 and the box body 102 jointly define the accommodating space; alternatively, the box cover 101 and the box body 102 can both be hollow structures with one side being open, the open side of the box cover 101 being combined with the open side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 can have various shapes, such as a cylinder, a cuboid, etc.

[0092] The battery module 20 is composed of a plurality of battery cells in series, in parallel, or in a mixed connection. In the battery 100, the battery module 20 can be multiple, and the multiple battery modules 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery modules 20 have both series connection and parallel connection. The multiple battery modules 20 can be directly connected in series, in parallel, or in a mixed connection, and the whole formed by the multiple battery modules 20 is placed in the accommodating space formed by the box body 102 and the box cover 101. The battery 100 can further include other structures, for example, the battery 100 can further include a current combiner component for realizing electrical connection between the multiple battery cells or the multiple battery modules 20.

[0093] In the embodiments of the present disclosure, the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0094] As an example, the battery cell can be a cylindrical battery, a prismatic battery, a soft pack battery, or a battery of other shapes, and the prismatic battery includes a square battery, a blade battery, a multi-prismatic battery, for example, a hexagonal prismatic battery, etc., and the present disclosure is not particularly limited.

[0095] In the following, some embodiments of the present disclosure are described in detail with reference to FIGS. 3 to 18.

[0096] FIG. 3 is a partial perspective view of a first structure of a battery according to some embodiments of the present disclosure; FIG. 4 is a perspective view of a first structure of a battery module according to some embodiments of the present disclosure from one viewing angle; FIG. 5 is a perspective view of the first structure of the battery module according to some embodiments of the present disclosure from another viewing angle; FIG. 6 is a front view of the first structure of the battery module according to some embodiments of the present disclosure; FIG. 7 is a perspective view of a first battery cell according to some embodiments of the present disclosure; FIG. 8 is an exploded perspective view of the first battery cell according to some embodiments of the present disclosure; FIG. 9 is a perspective view of a second battery cell according to some embodiments of the present disclosure; FIG. 10 is an exploded perspective view of the second battery cell according to some embodiments of the present disclosure; FIG. 11 is a partial perspective view of a second structure of a battery according to some embodiments of the present disclosure; FIG. 12 is a perspective view of a second structure of a battery module according to some embodiments of the present disclosure from one viewing angle; FIG. 13 is a perspective view of the second structure of the battery module according to some embodiments of the present disclosure from another viewing angle; FIG. 14 is a top view of the second structure of the battery module according to some embodiments of the present disclosure; FIG. 15 is a perspective view of a third structure of a battery module according to some embodiments of the present disclosure; FIG. 16 is a front view of the third structure of the battery module according to some embodiments of the present disclosure; FIG. 17 is a side view of the third structure of the battery module according to some embodiments of the present disclosure; and FIG. 18 is a top view of the third structure of the battery module according to some embodiments of the present disclosure.

[0097] For ease of illustration, as shown by arrows in FIGS. 3 to 18, the direction in which the arrow Z is located is the first direction, the direction in which the arrow Y is located is the second direction, and the direction in which the arrow X is located is the third direction. The first direction Z, the second direction Y, and the third direction X are perpendicular to each other, and sometimes the direction indicated by the first direction Z is referred to as “upward”, and the opposite direction is referred to as “downward”.

[0098] Referring to FIGS. 2-18, the first aspect of the disclosure provides a battery 100, which includes a battery box 10, at least one first battery cell 1, and at least one second battery cell 2. The battery box 10 has an upper box plate 1011 and a lower box plate 1021, the upper box plate 1011 is arranged above the lower box plate 1021, and a containing space is arranged between the two. The at least one first battery cell 1 and the at least one second battery cell 2 are arranged in the containing space. The first battery cell 1 is arranged closer to the lower box plate 1021 relative to the second battery cell 2, and the second battery cell 2 is arranged closer to the upper box plate 1011 relative to the first battery cell 1. The first battery cell 1 is a sodium-ion battery, and the second battery cell 2 is a lithium-ion battery.

[0099] The upper box plate 1011 is the upper top plate of the battery box 10, and the lower box plate 1021 is the lower bottom plate of the battery box 10. The upper box plate 1011 and the lower box plate 1021 are arranged opposite to each other in the vertical direction, and the lower box plate 1021 is below the upper box plate 1011. That is, the upper box plate 1011 is part or all of the box cover 101, and the lower box plate 1021 is the box plate of the box body 102 opposite to the opening thereon. The first battery cell 1 is arranged closer to the lower box plate 1021 relative to the second battery cell 2, and the second battery cell 2 is arranged closer to the upper box plate 1011 relative to the first battery cell 1. That is, the position height of the first battery cell 1 is lower than that of the second battery cell 2, and the first battery cell 1 is closer to the space below the lower box plate 1021 relative to the second battery cell 2.

[0100] The first battery cell 1 is arranged closer to the lower box plate 1021 relative to the second battery cell 2, and the second battery cell 2 is arranged closer to the upper box plate 1011 relative to the first battery cell 1. This means that the first battery cell 1 can be directly below the second battery cell 2, that is, the first battery cell 1 and the second battery cell 2 have a coincident part in the vertical direction (the first direction Z). The first battery cell 1 can also be diagonally below the second battery cell 2, that is, the first battery cell 1 and the second battery cell 2 are staggered in the vertical direction.

[0101] The containing space of the battery 100 can contain at least one battery module 20. Each battery module 20 includes at least one first battery cell 1 and at least one second battery cell 2. The first battery cell 1 in the same battery module 20 is arranged closer to the lower box plate 1021 relative to the second battery cell 2, and the second battery cell 2 is arranged closer to the upper box plate 1011 relative to the first battery cell 1. The battery modules 20 can be connected in series, in parallel, or in a hybrid manner.

[0102] In the case that the battery 100 is installed in an electric vehicle, the lower box plate 1021 is closer to the external environment (the space below the electric vehicle) than the upper box plate 1011, so that the first battery monomer 1 close to the lower box plate 1021 is closer to the external environment than the second battery monomer 2, and the temperature of the first battery monomer 1 is more easily affected by the external environment. When the electric vehicle is in a low-temperature environment, the temperature of the external environment is relatively low, and because the first battery monomer 1 is close to the external environment, the temperature of the first battery monomer 1 is relatively low, while the temperature of the second battery monomer 2 is relatively high.

[0103] The sodium-ion battery is a battery that mainly relies on sodium ions to move between the positive electrode and the negative electrode. During the charging process, sodium ions are deintercalated from the positive electrode, embedded into the negative electrode through the electrolyte; during the charging process, sodium ions are deintercalated from the negative electrode, embedded into the positive electrode through the electrolyte. The first battery monomer 1 adopts, but is not limited to, sodium oxide battery, sodium polyanion battery, sodium-sulfur battery, etc.

[0104] The sodium-ion battery has good low-temperature resistance, that is, the low-temperature capacity retention rate of the sodium-ion battery is relatively high. Therefore, the first battery monomer 1 adopts the sodium-ion battery, so that the charging and discharging capacity of the first battery monomer 1 is less affected by the low temperature, thereby the charging and discharging capacity of the first battery monomer 1 is high, and the battery 100 also has high charging and discharging capacity in a low-temperature environment.

[0105] The lithium-ion battery is a battery that mainly relies on lithium ions to move between the positive electrode and the negative electrode. During the charging process, lithium ions are deintercalated from the positive electrode, embedded into the negative electrode through the electrolyte; during the charging process, lithium ions are deintercalated from the negative electrode, embedded into the positive electrode through the electrolyte. The second battery monomer 2 adopts, but is not limited to, lithium cobaltate battery, lithium iron phosphate battery, ternary lithium battery, lithium manganate battery, polymer lithium-ion battery, etc.

[0106] Because the low-temperature resistance of the lithium-ion battery is relatively poor compared with the sodium-ion battery, that is, the low-temperature capacity retention rate of the sodium-ion battery is higher than that of the lithium-ion battery, and because the second battery monomer 2 is far away from the external environment, the charging and discharging capacity of the second battery monomer 2 is less affected by the external environment, so that the temperature of the second battery monomer 2 is relatively high. Therefore, the second battery monomer 2 adopts the lithium-ion battery, and the battery 100 also has high charging and discharging capacity in a low-temperature environment. Moreover, the energy density of the lithium-ion battery is generally higher than that of the sodium-ion battery, and the second battery monomer 2 adopts the lithium-ion battery, which can improve the overall energy density of the battery 100 and is more conducive to improving the overall charging and discharging capacity of the battery 100.

[0107] The low-temperature capacity retention rate refers to the ratio of the charge and discharge capacity of a battery cell in a low-temperature environment to the charge and discharge capacity of the battery cell at a standard temperature (usually room temperature, for example, 20°C or 25°C). This index reflects the performance of the battery in a low-temperature condition and is an important parameter for measuring the low-temperature resistance of the battery. The low-temperature capacity retention rate of the battery cell is related to the formulation of the electrolyte and the material of the electrode.

[0108] The first battery cell 1 can be a hard-shell battery cell or a soft-pack battery cell, and the second battery cell 2 can be a hard-shell battery cell or a soft-pack battery cell.

[0109] The first battery cell 1 adopts a sodium-ion battery, and the second battery cell 2 adopts a lithium-ion battery. Since the low-temperature capacity retention rate of the sodium-ion battery is higher than that of the lithium-ion battery, the low-temperature capacity retention rate of the first battery cell 1 is higher than that of the second battery cell 2. The first battery cell 1 is close to the external environment, and when the external environment is a low-temperature environment, the temperature of the first battery cell 1 is relatively low. However, since the low-temperature capacity retention rate of the first battery cell 1 is relatively high, the low temperature has a relatively small impact on the charge and discharge capacity of the first battery cell 1. Therefore, the first battery cell 1 can also maintain a relatively high charge and discharge capacity in a low-temperature state. In addition, since the second battery cell 2 is relatively far away from the external low-temperature environment, the temperature of the second battery cell 2 is less affected by the external low-temperature environment, i.e., the temperature of the second battery cell 2 is relatively high. Therefore, even if the low-temperature capacity retention rate of the second battery cell 2 is relatively low, the impact on the charge and discharge capacity of the second battery cell 2 is also relatively small, i.e., the charge and discharge capacity of the second battery cell 2 is also relatively high. As a result, the battery 100 including the first battery cell 1 and the second battery cell 2 also has a relatively high charge and discharge capacity when used in a low-temperature environment. Moreover, since the low temperature has a relatively small impact on the charge and discharge capacity of the first battery cell 1, the charging capacity difference between the first battery cell 1 and the second battery cell 2 is relatively small, which can reduce the probability of lithium precipitation in the first battery cell 1.

[0110] In some embodiments, the second battery cell 2 adopts a lithium iron phosphate battery or a ternary lithium battery.

[0111] The lithium iron phosphate battery is a lithium-ion battery using lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. The ternary lithium battery is a lithium battery using lithium nickel cobalt manganese oxide (Li(NiCoMn)O2) or lithium nickel cobalt aluminum oxide as the ternary positive electrode material.

[0112] Both the lithium iron phosphate battery and the ternary lithium battery have the characteristic of high energy density. Therefore, adopting the lithium iron phosphate battery or the ternary lithium battery for the second battery cell 2 is beneficial to improve the overall energy density of the battery 100 and further improve the overall charge and discharge capacity of the battery 100.

[0113] In some embodiments of the present disclosure, the first battery cell 1 and the second battery cell 2 have a coincident part in the vertical direction (the first direction Z).

[0114] In this way, the first battery cell 1 is arranged directly below the second battery cell 2, so that the first battery cell 1 is located between the second battery cell 2 and the external environment. When the external environment is a low-temperature environment, the temperature of the first battery cell 1 is relatively low, but the low-temperature capacity retention rate of the first battery cell 1 is relatively high, so the influence of low temperature on the charge-discharge capacity of the first battery cell 1 is relatively small. Therefore, the first battery cell 1 can also maintain a relatively high charge-discharge capacity in a low-temperature state. In addition, due to the blocking of the first battery cell 1, the influence of the external low-temperature environment on the temperature of the second battery cell 2 is further reduced, that is, the temperature of the second battery cell 2 is relatively high. Therefore, even if the low-temperature capacity retention rate of the second battery cell 2 is relatively low, the influence on the charge-discharge capacity is relatively small, that is, the charge-discharge capacity of the second battery cell 2 is also relatively high. Therefore, the battery 100 including the first battery cell 1 and the second battery cell 2 also has a relatively high charge-discharge capacity when used in a low-temperature environment. In addition, since the influence of low temperature on the charge-discharge capacity of the first battery cell 1 is relatively small, the difference in charging capacity between the first battery cell 1 and the second battery cell 2 is relatively small, which can reduce the probability of lithium precipitation of the first battery cell 1.

[0115] In some embodiments, the second battery cell 2 is arranged on the first surface 113 of the first battery cell 1, the first surface 113 is perpendicular to the first direction Z, the first battery cell 1 is arranged along the first direction Z, and / or the first battery cell 1 is arranged along a second direction Y perpendicular to the first direction Z.

[0116] For example, as shown in FIGS. 15 and 16, the first battery cell 1 is arranged along the first direction Z, so that the first battery cell 1 blocking the external environment and the second battery cell 2 has multiple layers, which can better reduce the influence of the external temperature on the temperature of the second battery cell 2, thereby reducing the influence of low temperature on the charge-discharge capacity of the second battery cell 2, and further improving the charge-discharge capacity of the battery 100.

[0117] For example, as shown in FIGS. 4, 5, 12 and 13, the first battery cell 1 is arranged along the second direction Y, so that the first battery cell 1 blocking the external environment and the second battery cell 2 has a larger area, so that more second battery cells 2 can be arranged, thereby increasing the charge-discharge capacity of the entire battery 100.

[0118] For example, the first battery cell 1 is arranged along the first direction Z and along the second direction Y, so that the first battery cell 1 has a larger area and multiple layers between the external environment and the second battery cell 2, which can better reduce the influence of the external temperature on the temperature of the second battery cell 2, and the second battery cell 2 can be arranged more, thereby increasing the charging and discharging capacity of the entire battery 100.

[0119] In this way, by arranging a plurality of first battery cells 1 on the first surface 113 of the first battery cell 1, the charging and discharging capacity of the entire battery 100 is increased.

[0120] In some embodiments, as shown in FIGS. 7 and 8, the first battery cell 1 includes a first shell 11 and a first electrode assembly 12, the first electrode assembly 12 is arranged in the first shell 11, and the first surface 113 is the surface with the largest area of the first shell 11.

[0121] The material of the first shell 11 can be a hard material, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., so that the first battery cell 1 is a hard-shell battery cell. The first shell 11 is a component having a first containing cavity that is isolated from the external environment, and the first containing cavity is used to contain the first electrode assembly 12, the electrolyte, and other components. The first shell 11 can have various shapes and sizes, such as a cuboid shape, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the first shell 11 can be determined according to the specific shape and size of the first electrode assembly 12. The material of the first shell 11 can also be a soft material, such as an aluminum plastic composite film and a polyimide film, etc. The first shell 11 encapsulates the first electrode assembly 12 and the electrolyte, so that the first battery cell 1 is a soft-pack battery cell.

[0122] The first electrode assembly 12 is a component in which electrochemical reactions occur in the first battery cell 1. One, two or more first electrode assemblies 12 can be contained within the first housing 11, and when there are two or more first electrode assemblies 12, the first electrode assemblies 12 are connected in parallel or in series. The first electrode assembly 12 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and an insulator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute the main body of the first electrode assembly 12, and portions without active materials that constitute the positive electrode tab and the negative electrode tab, respectively. In some examples, the first battery cell 1 is a hard-shell battery cell, and the first housing 11 of the first battery cell 1 is provided with at least one first pole 13, and the positive electrode tab and the negative electrode tab of the first electrode assembly 12 are connected to one first pole 13, respectively. During the charging and discharging of the first battery cell 1, the positive active material and the negative active material react with the electrolyte, and electrons form a current loop through a closed electrical circuit. In some examples, the first battery cell 1 is a soft-pack battery cell, and the first housing 11 includes two layers of soft film that encapsulate the first electrode assembly 12, and the positive electrode tab and the negative electrode tab of the first electrode assembly 12 extend outward through the junction between the two layers of soft film.

[0123] The first surface 113 is the surface with the largest area of the first housing 11, so that the area of the first battery cell 1 that is blocked between the external environment and the second battery cell 2 is larger, so that more second battery cells 2 can be provided, thereby increasing the charging and discharging capacity of the battery module 20, and further increasing the charging and discharging capacity of the entire battery 100.

[0124] In some embodiments, the ratio of the area of the first surface 113 to the dimension of the first housing 11 along the first direction Z is not less than 480.

[0125] In this way, the first battery cell 1 is more flat, and the area of the first surface 113 of the first battery cell 1 with the same volume is larger, so that the area of the first battery cell 1 that is blocked between the external environment and the second battery cell 2 is larger, so that more second battery cells 2 can be provided, thereby increasing the charging and discharging capacity of the battery module 20, and further increasing the charging and discharging capacity of the entire battery 100.

[0126] In some embodiments, the ratio of the area of the first surface 113 to the dimension of the first housing 11 along the first direction Z is between 480 and 9000.

[0127] For example, the ratio of the area of the first surface 113 to the dimension of the first housing 11 along the first direction Z is equal to, but not limited to, 480, 500, 600, 700, 800, 900, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000.

[0128] In some embodiments, the first shell 11 is made of an aluminum shell and / or a steel shell.

[0129] For example, the first shell 11 is made of an aluminum shell, i.e., the first shell 11 is made of aluminum material entirely. For example, the first shell 11 is made of a steel shell, i.e., the first shell 11 is made of steel material entirely. For example, the first shell 11 is made of an aluminum shell and a steel shell, i.e., the first shell 11 is made of aluminum material in part and steel material in part.

[0130] The first shell 11 is made of an aluminum shell and / or a steel shell, so that the first shell 11 is a hard shell and the first battery cell 1 is a hard shell battery cell. In this way, the first shell 11 has a certain hardness and strength, and the first shell 11 is not easy to deform when subjected to extrusion collision, so that the first battery cell 1 can have higher structural strength, and the safety performance can also be improved.

[0131] In some embodiments, as shown in FIG. 8, the first shell 11 includes a first end cover 111 and a first shell body 112, the first shell body 112 has an opening, and the first end cover 111 closes the opening of the first shell body 112 to form a first accommodating cavity, and the first electrode assembly 12 is arranged in the first accommodating cavity.

[0132] The first end cover 111 refers to a component that covers the opening of the first shell body 112 to isolate the internal environment of the first battery cell 1 from the external environment. Without limitation, the shape of the first end cover 111 can be adapted to the shape of the first shell body 112 to fit the first shell body 112. Optionally, the first end cover 111 can be made of a material having a certain hardness and strength, so that the first end cover 111 is not easy to deform when subjected to extrusion collision, so that the first battery cell 1 can have higher structural strength, and the safety performance can also be improved.

[0133] In some embodiments of the present disclosure, the first end cover 111 can also be provided with a first pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the first battery cell 1 reaches a threshold value. The material of the first end cover 111 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0134] In some embodiments of the present disclosure, an insulating piece can also be provided on the inner side of the first end cover 111, which can be used to isolate the electrical connection components in the first shell body 112 from the first end cover 111 to reduce the risk of short circuit. For example, the insulating piece can be plastic, rubber, etc.

[0135] The first shell 112 is a component for cooperating with the first end cover 111 to form an internal environment of the first battery cell 1, wherein the formed internal environment can be used to accommodate the first electrode assembly 12, electrolyte and other components. The first shell 112 and the first end cover 111 can be independent components, and an opening can be provided on the first shell 112, and the first end cover 111 is made to cover the opening to form the internal environment of the first battery cell 1. Without limitation, the first end cover 111 and the first shell 112 can also be integrated, specifically, the first end cover 111 and the first shell 112 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the first shell 112, the first end cover 111 is made to cover the first shell 112. The first shell 112 can be various shapes and various sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the first shell 112 can be determined according to the specific shape and size of the first electrode assembly 12. The material of the first shell 112 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0136] In some embodiments of the present disclosure, as shown in FIG. 7, the first shell 11 has a surface perpendicular to the first direction Z and opposite to the first surface 113 along the first direction Z, the first shell 11 also has two surfaces perpendicular to the second direction Y and opposite along the second direction Y, and the first shell 11 also has two surfaces perpendicular to the third direction X and opposite along the third direction X, the first direction Z and the second direction Y are both perpendicular to the third direction X.

[0137] In this way, the first shell 11 is formed as a cubic shell, which facilitates the assembly of the second battery cell 2 on the first battery cell 1 and improves the structural robustness of the group of the second battery cell 2 and the first battery cell 1.

[0138] In some embodiments of the present disclosure, as shown in FIG. 4 and FIG. 6, the size of the first shell 11 along the third direction X is greater than the size along the second direction Y, the size of the first shell 11 along the second direction Y is greater than the size along the first direction Z, and the second battery cell 2 is arranged along the first direction Z; or, the second battery cell 2 is arranged along the second direction Y; or, the second battery cell 2 is arranged along the third direction X.

[0139] In this way, the size of the first shell 11 along the third direction X is the length of the first shell 11, the size of the first shell 11 along the second direction Y is the width of the first shell 11, and the size of the first shell 11 along the third direction X is the thickness of the first shell 11. The second battery cell 2 is arranged in multiple, thereby increasing the charge and discharge capacity of the battery module 20, and further improving the battery capacity of the entire battery 100.

[0140] In some embodiments of the present disclosure, as shown in FIGS. 4, 5, 12 and 13, the first battery monomer 1 is arranged along the second direction Y, and at least one first pole 13 is arranged on each of the two opposite surfaces of the first shell 11 of the first battery monomer 1 along the third direction X.

[0141] In some embodiments of the present disclosure, as shown in FIGS. 4 to 6, the second battery monomer 2 is arranged along the third direction X, and the size of the plurality of second battery monomers 2 along the third direction X is equal to the size of the first shell 11 of the first battery monomer 1. Along the third direction X, the surface of the first second battery monomer 2 facing away from the second second battery monomer 2 is flush with the end surface of one end of the first shell 11 along the third direction X, and the surface of the last second battery monomer 2 facing away from the second second battery monomer 2 is flush with the end surface of one end of the first shell 11 along the third direction X.

[0142] In this way, the first battery monomer 1 and the second battery monomer 2 form a regular cuboid, which is beneficial to improve the energy density of the battery module 20 composed of the first battery monomer 1 and the second battery monomer 2, thereby increasing the charge and discharge capacity of the battery 100.

[0143] In some embodiments of the present disclosure, the first shell 11 adopts an aluminum plastic film.

[0144] The first shell 11 includes two layers of aluminum plastic film, and the first electrode assembly 12 is encapsulated between the two layers of aluminum plastic film. The positive and negative electrode tabs of the first electrode assembly 12 extend outward through the joint between the two layers of aluminum plastic film. The two layers of aluminum plastic film form two opposite surfaces along the first direction Z, one of which is the first surface 113.

[0145] In this way, the first shell 11 adopts an aluminum plastic film, so that the first battery monomer 1 is a soft pack battery monomer, and the energy density of the soft pack battery monomer is high, thereby improving the energy density of the battery module 20 and further improving the energy density of the battery 100.

[0146] In some embodiments of the present disclosure, the first shell 11 adopts an aluminum plastic film, the size of the first surface 113 of the first battery monomer 1 along the third direction X is greater than the size along the second direction Y, and the second battery monomer 2 is arranged along the second direction Y.

[0147] In this way, the first battery monomer 1 is a soft pack battery monomer, and the second battery monomer 2 is arranged along the second direction Y on the first surface 113 of the first battery monomer 1, which improves the energy density of the battery module 20 and improves the battery capacity of the entire battery 100.

[0148] In some embodiments of the present disclosure, as shown in FIGS. 9 and 10, the second battery cell 2 includes a second shell 21, a second electrode assembly 22 disposed in the second shell 21, and a second terminal post 23 disposed on the second shell 21, the second terminal post 23 being connected to the second electrode assembly 22.

[0149] The second shell 21 is a component having a second accommodating cavity that is isolated from the external environment, and the second accommodating cavity is used to accommodate the second electrode assembly 22, electrolyte, and other components. The second shell 21 can have various shapes and sizes, such as a cuboid shape, a hexagonal prism shape, or a cylindrical shape. Specifically, the shape of the second shell 21 can be determined according to the specific shape and size of the second electrode assembly 22. The material of the second shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present disclosure do not make special limitations thereon.

[0150] The second electrode assembly 22 is a component in which electrochemical reactions occur in the second battery cell 2. One, two, or more second electrode assemblies 22 can be contained in the second shell 21, and when there are two or more second electrode assemblies 22, the second electrode assemblies 22 are connected in parallel or in series. The second electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and an insulating member is usually disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body of the second electrode assembly 22, and a portion without active material constituting a positive electrode tab and a negative electrode tab, respectively. In the charging and discharging process of the second battery cell 2, the positive active material and the negative active material react with the electrolyte, and electrons form a current loop through a closed electrical circuit.

[0151] In this way, the second battery cell 2 forms a basic unit that can realize the mutual conversion of chemical energy and electrical energy. Moreover, since the low-temperature capacity retention rate of the first battery cell 1 is relatively high, the first battery cell 1 can also maintain a relatively high charging and discharging capacity in a low-temperature state. Due to the barrier of the first battery cell 1, the temperature of the second battery cell 2 is less affected by the external low-temperature environment, that is, the temperature of the second battery cell 2 is relatively high. In this way, even if the low-temperature capacity retention rate of the second battery cell 2 is relatively low, the charging and discharging capacity of the second battery cell 2 is less affected, that is, the charging and discharging capacity of the second battery cell 2 is also relatively high. Therefore, the battery 100 including the first battery cell 1 and the second battery cell 2 also has a relatively high charging and discharging capacity when used in a low-temperature environment.

[0152] In some embodiments, as shown in FIG. 10, the second shell 21 includes a second end cover 211 and a second shell body 212, the second shell body 212 has an opening, and the second end cover 211 closes the opening of the second shell body 212 to form a second accommodating cavity, and the second electrode assembly 22 is disposed in the second accommodating cavity.

[0153] The second end cover 211 refers to a component that covers the opening of the second shell 212 to isolate the internal environment of the second battery monomer 2 from the external environment. Without limitation, the shape of the second end cover 211 can be adapted to the shape of the second shell 212 to fit the second shell 212. Alternatively, the second end cover 211 can be made of a material with certain hardness and strength, so that the second end cover 211 is not easily deformed when subjected to extrusion collision, so that the second battery monomer 2 can have higher structural strength, and the safety performance can also be improved.

[0154] In some embodiments of the present disclosure, the second end cover 211 can also be provided with a second pressure relief mechanism 24 for relieving the internal pressure when the internal pressure or temperature of the second battery monomer 2 reaches a threshold value. The material of the second end cover 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present disclosure do not have special restrictions on this.

[0155] In some embodiments of the present disclosure, an insulating member can also be provided on the inner side of the second end cover 211, which can be used to isolate the electrical connection components in the second shell 212 from the second end cover 211 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0156] The second shell 212 is a component for fitting the second end cover 211 to form the internal environment of the second battery monomer 2, wherein the formed internal environment can be used to accommodate the second electrode assembly 22, electrolyte and other components. The second shell 212 and the second end cover 211 can be independent components, and an opening can be provided on the second shell 212, and the second end cover 211 is covered on the opening to form the internal environment of the second battery monomer 2. Without limitation, the second end cover 211 and the second shell 212 can also be integrated, specifically, the second end cover 211 and the second shell 212 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the second shell 212, the second end cover 211 is covered on the second shell 212. The second shell 212 can be various shapes and various sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the second shell 212 can be determined according to the specific shape and size of the second electrode assembly 22. The material of the second shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present disclosure do not have special restrictions on this.

[0157] In some embodiments of the present disclosure, as shown in FIG. 9, the second shell 21 is a cubic shell, including two opposite second surfaces 213, the second surface 213 being the largest surface of the second shell 21, and the second battery monomer 2 is arranged along a direction perpendicular to the second surface 213.

[0158] Thus, the second battery cell 2 is a square cell, the second battery cell 2 is arranged along the thickness direction thereof, and the structural strength of the group of the second battery cells 2 is high, so that the structural strength of the battery module 20 is high, thereby the structural strength of the battery 100 is high.

[0159] In some embodiments of the present disclosure, the second surface 213 is perpendicular to the first direction Z; or, the second surface 213 is perpendicular to the second direction Y; or, the second surface 213 is perpendicular to the third direction X, and the first direction Z and the second direction Y are both perpendicular to the third direction X.

[0160] Thus, the plurality of second battery cells 2 are arranged along the first direction Z, or along the second direction Y, or along the third direction X, so that the battery module 20 comprises the plurality of second battery cells 2, the battery capacity of the battery module 20 is increased, and the battery capacity of the battery 100 is increased.

[0161] As shown in FIGS. 4-6, in some embodiments of the present disclosure, the second battery cell 2 is arranged along the third direction X, and the second pole 23 is arranged on the upper surface of the second shell 21 of the second battery cell 2.

[0162] In some embodiments of the present disclosure, as shown in FIGS. 12-18, the second shell 21 is a cylindrical shell, and the central axis of the second shell 21 of the second battery cell 2 extends along the first direction Z; or, the central axis of the second shell 21 of the second battery cell 2 extends along the second direction Y.

[0163] In some embodiments of the present disclosure, as shown in FIGS. 12-18, the first surface 113 is rectangular, the extension direction of the short side of the first surface 113 is consistent with the second direction Y, the extension direction of the long side of the first surface 113 is consistent with the third direction X which is perpendicular to the first direction Z and the second direction Y, the second shell 21 is a cylindrical shell, and the central axis of the second shell 21 of the second battery cell 2 extends along the third direction X.

[0164] Thus, the second battery cell 2 is a cylindrical cell, the axial direction of the second battery cell 2 is consistent with the length direction of the first battery cell 1, which is conducive to improving the bending strength of the battery module 20 along the third direction X, thereby improving the structural strength of the battery 100.

[0165] In some embodiments of the present disclosure, the second battery cell 2 is arranged along the second direction Y.

[0166] Thus, the second battery cell 2 is arranged along the second direction Y, so that the plurality of second battery cells 2 are arranged on the first surface 113 of the first battery cell 1, the battery capacity of the battery module 20 is increased, and the battery capacity of the battery 100 is increased.

[0167] In some embodiments of the present disclosure, as shown in FIGS. 12 and 13, the second battery cells 2 are arranged in at least two columns along the first direction Z, the second battery cells 2 in adjacent two columns are staggered along the first direction Z, and the second battery cells 2 in odd-numbered columns are aligned along the first direction Z, and the second battery cells 2 in even-numbered columns are aligned along the first direction Z.

[0168] For example, as shown in FIGS. 12 and 13, the second battery cells 2 are arranged in three columns along the first direction Z, the first column and the third column are provided with four second battery cells 2, and the second column is provided with three second battery cells 2.

[0169] The "second battery cells 2 in adjacent two columns are staggered along the first direction Z" means that, as viewed along the first direction Z, the second battery cells 2 in adjacent two columns are staggered and misaligned.

[0170] By staggering the adjacent columns, part of the second battery cells 2 in one column is accommodated in the recessed space formed between two adjacent second battery cells 2 in another column, the space is arranged reasonably, the space occupation is saved, the reliability of the group of second battery cells 2 is improved, and thus the structural strength of the battery module 20 is improved, and the structural strength of the battery 100 is improved.

[0171] In some embodiments of the present disclosure, the second housing 21 of the second battery cell 2 has a dimension along the third direction X equal to that of the first housing 11 of the first battery cell 1 along the third direction X, and the two end edges of the second housing 21 along the third direction X are respectively aligned with the two end edges of the first housing 11 along the third direction X.

[0172] In this way, the reliability of the group of the first battery cell 1 and the second battery cell 2 is improved, the energy density of the battery module 20 is improved, and thus the structural strength and the energy density of the battery 100 are improved.

[0173] The second aspect of the present disclosure provides an energy storage device comprising at least one battery 100 provided by the first aspect.

[0174] Since the energy storage device comprises the battery 100, the energy storage device has all the beneficial effects of the battery 100, and thus the charge-discharge capacity of the energy storage device is improved and the probability of lithium precipitation is low.

[0175] The third aspect of the present disclosure provides an electric device, which comprises at least one battery 100 provided by the first aspect for providing electric energy.

[0176] Since the electric device comprises the battery 100, the electric device has all the beneficial effects of the battery 100, and thus the charge-discharge capacity of the electric device is improved and the probability of lithium precipitation is low.

[0177] In the following, specific examples of some embodiments of the present disclosure are described with reference to the accompanying drawings.

[0178] As a specific example, as shown in FIGS. 4-6, a sodium battery (first battery cell 1) is arranged at the bottom inside the battery pack (battery 100), the sodium battery is a square cell, and the sodium battery has pole posts (first pole post 13) at opposite ends. The sodium battery is laid flat and side by side at the bottom of the battery box (battery box 10), and heat-conducting glue is applied between the large face of the sodium battery and the bottom face of the battery box to facilitate heat exchange. A square lithium iron phosphate battery (second battery cell 2) is arranged on the upper part of the sodium battery, the lithium iron phosphate battery is vertically arranged on the upper part of the sodium battery, and the length direction of the lithium iron phosphate battery is perpendicular to the length direction of the sodium battery, which can enhance the structural strength of the battery pack. The thickness direction size of the lithium iron phosphate battery side by side is equal to the length of the sodium battery, which facilitates the maximum use of the space of the battery pack.

[0179] As a specific example, as shown in FIGS. 12-14, a square sodium battery (first battery cell 1) is arranged at the bottom inside the battery pack (battery 100), the sodium battery has pole posts (first pole post 13) at opposite ends. The sodium battery is laid flat and side by side at the bottom of the battery box (battery box 10), and plays a role of heat preservation. A ternary cylindrical battery (second battery cell 2) is arranged on the upper part of the sodium battery along the length direction of the sodium battery, and the upper and lower layers of the cylindrical battery are staggered and stacked. The length of the cylindrical battery is equal to the length of the sodium battery, which plays a role of enhancing the structural strength in the battery pack.

[0180] As a specific example, as shown in FIGS. 15-18, a soft package sodium battery (first battery cell 1) is arranged at the bottom inside the battery pack (battery 100), and the sodium battery has two layers in the up-down direction, and has pole tabs at both ends. A cylindrical lithium battery (second battery cell 2) is arranged on the upper part of the sodium battery, and the axial direction of the lithium battery is parallel to the extension direction of the pole tabs of the soft package sodium battery. The cylindrical lithium battery can be a lithium iron phosphate battery or a ternary battery. The cylindrical lithium battery can be arranged in one layer, two layers or three layers in the up-down direction.

[0181] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; 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 disclosure, and they should be covered in the scope of the specification of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner.

Claims

1. A battery, comprising: A battery box has an upper box plate and a lower box plate, the upper box plate being located above the lower box plate, and an accommodating space being provided between the two; At least one first battery cell and at least one second battery cell are disposed within the receiving space. The first battery cell is disposed closer to the lower casing plate than the second battery cell, and the second battery cell is disposed closer to the upper casing plate than the first battery cell. The first battery cell is a sodium-ion battery, and the second battery cell is a lithium-ion battery.

2. The battery according to claim 1, wherein, The second battery cell uses either a lithium iron phosphate battery or a ternary lithium battery.

3. The battery according to any one of claims 1 or 2, wherein, The second battery cell is disposed on the first surface of the first battery cell, and the first surface is perpendicular to the first direction. The first battery cells are arranged along the first direction, and / or the first battery cells are arranged along a second direction perpendicular to the first direction.

4. The battery according to claim 3, wherein, The first battery cell includes a first housing and a first electrode assembly, wherein the first electrode assembly is disposed inside the first housing. The first surface is the surface with the largest area of ​​the first outer shell.

5. The battery according to claim 4, wherein, The ratio of the area of ​​the first surface to the dimension of the first housing along the first direction is not less than 480.

6. The battery according to claim 4 or 5, wherein, The first outer casing is made of aluminum and / or steel.

7. The battery according to claim 6, wherein, The first outer casing has a surface perpendicular to the first direction and opposite to the first surface along the first direction. The first outer casing also has two surfaces that are perpendicular to the second direction and opposite to each other along the second direction. The first housing also has two surfaces that are perpendicular to and opposite to a third direction, the first direction and the second direction being perpendicular to the third direction.

8. The battery according to claim 7, wherein, The dimension of the first housing along the third direction is greater than the dimension along the second direction, and the dimension of the first housing along the second direction is greater than the dimension along the first direction. The second battery cell is arranged along the first direction; or The second battery cell is arranged along the second direction; or The second battery cell is arranged along the third direction.

9. The battery according to claim 4 or 5, wherein, The first outer shell is made of aluminum-plastic film.

10. The battery according to any one of claims 4 to 9, wherein, The second battery cell includes a second housing, a second electrode assembly disposed within the second housing, and a second terminal post disposed within the second housing, wherein the second terminal post and the second electrode assembly are connected.

11. The battery according to claim 10, wherein, The second outer shell is a cubic shell, including two opposing second surfaces, which are the surfaces with the largest area of ​​the second outer shell. The second battery cell is arranged in a direction perpendicular to the second surface.

12. The battery according to claim 11, wherein, The second surface is perpendicular to the first direction; or The second surface is perpendicular to the second direction; or The second surface is perpendicular to the third direction, and both the first and second directions are perpendicular to the third direction.

13. The battery according to claim 10, wherein, The first surface is rectangular, the extension direction of the shorter side of the first surface is consistent with the second direction, and the extension direction of the longer side of the first surface is consistent with a third direction that is perpendicular to both the first and second directions. The second outer casing is a cylindrical casing, and the central axis of the second outer casing of the second battery cell extends along the third direction.

14. The battery according to claim 13, wherein, The second battery cell is arranged along the second direction.

15. The battery according to claim 14, wherein, The second battery cell is arranged in at least two columns along the first direction, and the second battery cells in two adjacent columns are staggered along the first direction. The second battery cells in the odd-numbered columns are aligned with each other along the first direction, and the second battery cells in the even-numbered columns are aligned with each other along the first direction.

16. An energy storage device comprising at least one battery according to any one of claims 1 to 15.

17. An electrical device comprising at least one battery according to any one of claims 1 to 15 for providing electrical energy.

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