Battery, energy storage device and power utilization device

Abstract

The utility model discloses a battery, an energy storage device and a power utilization device. The battery comprises a battery box which is provided with 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 formed between the upper box plate and the lower box plate; the at least one first battery monomer and the at least one second battery monomer are arranged in the accommodating space, the first battery monomer is arranged close to the lower box plate relative to the second battery monomer, 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. The energy storage device comprises at least one battery, the power utilization device comprises the battery used for providing electric energy, and the charging and discharging capacity of the battery, the energy storage device and the power utilization device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to batteries, energy storage devices and electrical devices. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage. In new energy vehicles equipped with batteries, batteries can be used to provide power in whole or in part. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] The charge and discharge capacity of the battery will be affected in a low temperature environment. How to improve the charge and discharge capacity of the battery in a low temperature environment is one of the topics that the industry needs to study. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery, an energy storage device and an electrical device with high charge and discharge capacity.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of the present application provides a battery, comprising a battery box having an upper box plate and a lower box plate, wherein the upper box plate is arranged above the lower box plate, and a storage space is provided between the two; at least one first battery cell and at least one second battery cell are both arranged in the storage 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 is a sodium ion battery, and the second battery cell is a lithium ion battery.

[0007] When the battery provided by the present application is installed in an electric vehicle, the lower box plate is closer to the external environment (the space under 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, and the first battery cell is more susceptible to the temperature of the external environment, while the second battery cell is not susceptible to the temperature of the external environment. When the external environment is a low temperature environment, the temperature of the first battery cell is relatively low, while the temperature of the second battery cell is relatively high. 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 the low temperature capacity retention rate of the lithium ion battery, that is, the low temperature capacity retention rate of the first battery cell is higher than the low temperature capacity retention rate of the second battery cell. Therefore, the low temperature has a relatively small effect on the charge and discharge capacity of the first battery cell. Therefore, the first battery cell can also maintain a relatively high charge and discharge capacity under low temperature conditions. Moreover, since the temperature of the second battery cell is relatively high, even if the low temperature capacity retention rate of the second battery cell is low, its charge and discharge capacity is relatively less affected. That is, the charge and discharge capacity of the second battery cell is also relatively high, so that the battery including the first battery cell and the second battery cell has a relatively high charge and discharge capacity when used in a low temperature environment. Moreover, since low temperature has little effect on the charge and discharge capacity of the first battery cell, the difference in charging capacity between the first battery cell and the second battery cell is small, which can reduce the probability of lithium deposition in the first battery cell.

[0008] In some embodiments, the second battery cell is a lithium iron phosphate battery or a ternary lithium battery.

[0009] Both lithium iron phosphate batteries and ternary lithium batteries have the characteristics of high energy density. Therefore, using lithium iron phosphate batteries or ternary lithium batteries as the second battery cell is beneficial to improving the overall energy density of the battery, and is more beneficial to improving the overall charge and discharge capacity of the battery.

[0010] In some embodiments, the second battery cells are disposed on a first surface of the first battery cells, 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.

[0011] In this way, by arranging a plurality of first battery cells on the first surface of the first battery cell, the charge and discharge capacity of the entire battery is increased.

[0012] In some embodiments, the first battery cell includes a first housing and a first electrode assembly, the first electrode assembly is disposed in the first housing, and the first surface is a surface with the largest area of ​​the first housing.

[0013] The first surface is the largest surface of the first housing, so that the area of ​​the first battery cell blocked between the external environment and the second battery cell is larger, so that more second battery cells can be arranged, thereby increasing the charge and discharge capacity of the entire battery.

[0014] In some embodiments, a ratio of an area of ​​the first surface to a dimension of the first housing along the first direction is not less than 480.

[0015] In this way, the first battery cell is made flatter, and the area of ​​the first surface of the first battery cell of the same volume is larger, so that the area of ​​the first battery cell blocking the external environment and the second battery cell is larger, so that more second battery cells can be arranged, thereby increasing the charge and discharge capacity of the entire battery.

[0016] In some embodiments, the first housing is made of an aluminum shell and / or a steel shell.

[0017] The first shell is made of aluminum and / or steel, so that the first shell is a hard shell, and the first battery cell is a hard shell battery cell. In this way, the first shell has a certain hardness and strength, and the first shell is not easily deformed when squeezed and collided, so that the first battery cell can have a higher structural strength and the safety performance can also be improved.

[0018] In some embodiments, the first shell has a surface perpendicular to the first direction and opposite to the first surface along the first direction, the first shell also has two surfaces perpendicular to the second direction and opposite to the second direction, the first shell also has two surfaces perpendicular to the third direction and opposite to the third direction, and the first direction and the second direction are both perpendicular to the third direction.

[0019] In this way, the first housing is formed into a cubic shell, which facilitates the assembly of the second battery cell on the first battery cell, thereby improving the structural reliability of the second battery cell and the first battery cell group.

[0020] In some embodiments, a dimension of the first housing along the third direction is greater than a dimension along the second direction, a dimension of the first housing along the second direction is greater than a dimension along the first direction, and the second battery cells are arranged along the first direction; or, the second battery cells are arranged along the second direction; or, the second battery cells are arranged along the third direction.

[0021] Thus, the dimension of the first shell along the third direction is the length of the first shell, the dimension of the first shell along the second direction is the width of the first shell, and the dimension of the first shell along the third direction is the thickness of the first shell. A plurality of second battery cells are arranged to increase the battery capacity of the entire battery.

[0022] In some embodiments, the first housing is made of aluminum-plastic film.

[0023] In this way, the first housing is made of 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.

[0024] In some embodiments, the second battery cell includes a second outer shell, a second electrode assembly disposed in the second outer shell, and a second pole disposed in the second outer shell, and the second pole is connected to the second electrode assembly.

[0025] In this way, the second battery cell forms a basic unit that can realize the mutual conversion of chemical energy and electrical energy. In addition, since the low-temperature capacity retention rate of the first battery cell is relatively high, the first battery cell can also maintain a relatively high charge and 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, so that even if the low-temperature capacity retention rate of the second battery cell is relatively low, its charge and discharge capacity is also less affected, that is, the charge and discharge capacity of the second battery cell is also relatively high, so that the battery including the first battery cell and the second battery cell has a relatively high charge and discharge capacity when used in a low-temperature environment.

[0026] In some embodiments, the second housing is a cubic shell including two opposite second surfaces, the second surface being a surface with the largest area of ​​the second housing, and the second battery cells are arranged along a direction perpendicular to the second surfaces.

[0027] In this way, the second battery cells are square shell batteries, the second battery cells are arranged along the thickness direction, and the second battery cells are grouped together with high structural strength, thereby making the structural strength of the battery high.

[0028] 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 a third direction, and both the first direction and the second direction are perpendicular to the third direction.

[0029] In this way, 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 includes the plurality of second battery cells, thereby increasing the battery capacity of the battery.

[0030] In some embodiments, the first surface is a rectangle, 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 a third direction 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.

[0031] In this way, 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 beneficial to improving the bending strength of the battery along the third direction, thereby improving the structural strength of the battery.

[0032] In some embodiments, the second battery cells are arranged along the second direction.

[0033] In this way, 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 increasing the battery capacity of the battery.

[0034] In some embodiments, the second battery cells are arranged in at least two columns along the first direction, the second battery cells in two adjacent columns are staggered along the first direction, and the second battery cells in odd columns are aligned along the first direction, and the second battery cells in even columns are aligned along the first direction.

[0035] By staggering adjacent columns, part of the second battery cells in one column is accommodated in the recessed space formed between two adjacent second battery cells in another column. The space arrangement is reasonable, which not only saves space but also improves the reliability of the grouping between the second battery cells, thereby improving the structural strength of the battery.

[0036] A second aspect of the present application provides an energy storage device comprising at least one of the above-mentioned batteries.

[0037] Since the energy storage device includes a battery, the energy storage device has all the beneficial effects of a battery, and therefore, the charge and discharge capacity of the energy storage device is improved and the probability of lithium deposition is low.

[0038] A third aspect of the present application provides an electrical device, which includes the above-mentioned battery for providing electrical energy.

[0039] Since the electrical device includes a battery, the electrical device has all the beneficial effects of the battery, so the charge and discharge capacity of the electrical device is improved and the probability of lithium deposition is low.

[0040] Utility Model Effect

[0041] Through the present application, a battery, an energy storage device and an electrical device with high charge and discharge capacity can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0043] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application;

[0044] Figure 2 A three-dimensional exploded schematic diagram of a battery provided in some embodiments of the present application;

[0045] Figure 3 A partial three-dimensional structural schematic diagram of a first structure of a battery provided in some embodiments of the present application;

[0046] Figure 4 A schematic diagram of a three-dimensional structure from one perspective of a first structure of a battery module provided in some embodiments of the present application;

[0047] Figure 5 A schematic diagram of a three-dimensional structure of a first structure of a battery module provided in some embodiments of the present application from another perspective;

[0048] Figure 6 A front view of a first structure of a battery module provided in some embodiments of the present application;

[0049] Figure 7 A schematic diagram of a three-dimensional structure of a first battery cell provided in some embodiments of the present application;

[0050] Figure 8 A perspective exploded view of a first battery cell provided for some embodiments of the present application;

[0051] Fig. 9 A schematic diagram of a three-dimensional structure of a second battery cell provided in some embodiments of the present application;

[0052] Fig.10 A perspective exploded view of a second battery cell provided for some embodiments of the present application;

[0053] Fig.11 A partial three-dimensional structural schematic diagram of a second structure of a battery provided in some embodiments of the present application;

[0054] Fig.12 A schematic diagram of a three-dimensional structure from one perspective of a second structure of a battery module provided in some embodiments of the present application;

[0055] Fig.13 A schematic diagram of a three-dimensional structure from another perspective of a second structure of a battery module provided in some embodiments of the present application;

[0056] Fig.14 A top view of a second structure of a battery module provided in some embodiments of the present application;

[0057] Fig.15 A schematic diagram of a three-dimensional structure of a battery module according to some embodiments of the present application;

[0058] Fig.16 A front view of a third structure of a battery module provided in some embodiments of the present application;

[0059] Fig.17 A side view of a third structure of a battery module provided for some embodiments of the present application;

[0060] Fig.18 A top view of a third structure of a battery module provided for some embodiments of the present application.

[0061] Description of Reference Numerals

[0062] 1000 vehicle; 100 battery; 200 controller; 300 motor; 10 battery box; 101 box cover; 1011 upper box plate; 102 box body; 1021 lower box plate; 20 battery module; 1 first battery cell; 11 first outer shell; 111 first end cover; 112 first shell; 113 first surface; 12 first electrode assembly; 13 first pole; 2 second battery cell; 21 second outer shell; 211 second end cover; 22 second electrode assembly; 221 second end cover; 212 second shell; 213 second surface; 23 second pole; 24 second pressure relief mechanism. DETAILED DESCRIPTION

[0063] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0065] In the description of the embodiments of the present application, the technical terms "first", "second", "third", 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 clearly and specifically defined.

[0066] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0067] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0068] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0070] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0071] Below, this application is described in detail.

[0072] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0073] The battery mentioned in the embodiments of the present application may include two or more battery cells to provide a single physical module with higher voltage and capacity. The multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component.

[0074] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0075] In some embodiments, the battery may be a battery pack, which includes a battery box and battery cells, wherein the battery cells or battery modules are accommodated in the box.

[0076] In some embodiments, the battery box can be used as part of the chassis structure of the vehicle. For example, part of the battery box can become at least a part of the floor of the vehicle, or part of the battery box can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0077] In some embodiments, a plurality means more than two.

[0078] In some embodiments, the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0079] The inventor of the present application noticed that multiple battery cells in a battery commonly used to power electric vehicles use the same type of battery cell, that is, the low-temperature capacity retention rate of the multiple battery cells is the same. When the external environment is a low temperature environment, the temperature of the battery cells far away from the external environment is higher, and the battery capacity can be better exerted. In other words, the charge and discharge capacity of the battery cells far away from the external environment is relatively high, while the temperature of the battery cells close to the external environment in the battery is relatively low. Low temperature will affect the normal performance of the battery capacity, making the charge and discharge capacity of the low-temperature battery cells 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 can easily cause lithium precipitation in the low-temperature battery cells.

[0080] The inventor of the present application has found through research that, instead of the traditional combination of the same 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 the low-temperature capacity retention rate of the battery cell far from the external environment, which reduces the influence of the external temperature on the charge and discharge capacity of the battery cell close to the external environment, that is, the low-temperature battery cell can better exert its battery capacity, which is conducive to improving 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 difference in charging capacity between different types of battery cells is small, which reduces the probability of lithium deposition in the low-temperature battery cell.

[0081] Based on such a design concept, the inventor of the present application designed a battery, including a battery box and at least one first battery cell and at least one second battery cell, the battery box having an upper box plate and a lower box plate, the upper box plate being arranged above the lower box plate, and an accommodating space being arranged between the two; at least one first battery cell and at least one second battery cell are both arranged in the accommodating 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 is a sodium ion battery, and the second battery cell is a lithium ion battery.

[0082] 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 the low temperature capacity retention rate of the lithium ion battery, the low temperature capacity retention rate of the first battery cell is higher than the low temperature capacity retention rate of the second battery cell. When the battery provided by the present application 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 because the low temperature capacity retention rate of the first battery cell is high, the low temperature has a relatively small effect on the charge and discharge capacity of the first battery cell. Therefore, the first battery cell can also maintain a high charge and discharge capacity under low temperature conditions, and because the second battery cell is far away from the external environment, its temperature is less affected by the low temperature environment, that is, the temperature of the second battery cell is relatively high, so that even if the low temperature capacity retention rate of the second battery cell is low, its charge and discharge capacity is also less affected, that is, the charge and discharge capacity of the second battery cell is also relatively high, so that the battery including the first battery cell and the second battery cell has a high charge and discharge capacity when used in a low temperature environment.

[0083] The battery provided in the embodiment of the present application can be used in, but not limited to, energy storage devices or power consumption devices. The energy storage device can be, but not limited to, an energy storage container, an energy storage cabinet, etc. The power consumption device can be, but not limited to, a vehicle, a ship, or an aircraft, etc., for example, a mobile phone, a portable device, a laptop computer, a battery car, an electric toy, an electric tool, a vehicle, a ship, and a spacecraft, etc. For example, a spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. As long as the lower box plate of the energy storage device or the power consumption device is closer to the external environment than the upper box plate when in use, the charge and discharge capacity can be improved.

[0084] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as a vehicle 1000 as an example for description. The following is a description with reference to the accompanying drawings.

[0085] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0086] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0087] Figure 2 Schematic diagram of a three-dimensional exploded view of a battery 100 provided in some embodiments of the present application. Figure 2 As shown, the battery 100 includes a battery box 10 and at least one battery module 20. The battery box 10 is provided with a receiving space, and the at least one battery module 20 is received in the receiving space.

[0088] In some embodiments of the present application, the battery box 10 includes a box body 102 and a box cover 101 , and the box cover 101 covers the box body 102 , so that the accommodating space is formed between the box body 102 and the box cover 101 .

[0089] The box body 102 may be a hollow structure with one end open, and the box cover 101 may be a plate-like structure, and the box cover 101 covers the open side of the box body 102, so that the box cover 101 and the box body 102 jointly define a storage space; the box cover 101 and the box body 102 may also be hollow structures with one side open, and the open side of the box cover 101 covers 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 may be in various shapes, such as a cylinder, a cuboid, etc.

[0090] The battery module 20 is composed of multiple battery cells connected in series, in parallel or in mixed connection. In the battery 100, there can be multiple battery modules 20, and the multiple battery modules 20 can be connected in series, in parallel or in mixed connection. Mixed connection means that the multiple battery modules 20 are both connected in series and in parallel. The multiple battery modules 20 can be directly connected in series, in parallel or in mixed connection, and then the whole composed of the multiple battery modules 20 is placed in the accommodation space formed by the box body 102 and the box cover 101. The battery 100 may also include other structures. For example, the battery 100 may also include a confluence component for realizing electrical connection between multiple battery cells or multiple battery modules 20.

[0091] In the embodiment of the present application, 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 storage battery, etc., but the embodiment of the present application is not limited to this.

[0092] As an example, the battery cell can be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes. Prismatic batteries include square shell batteries, blade-shaped batteries, and polygonal batteries. Polygonal batteries are, for example, hexagonal batteries, etc. There is no special limitation in this application.

[0093] Below, refer to Figures 3 to 18 Some embodiments of the present application are described in detail.

[0094] Figure 3 A partial three-dimensional structural schematic diagram of a first structure of a battery provided in some embodiments of the present application; Figure 4 A schematic diagram of a three-dimensional structure from one perspective of a first structure of a battery module provided in some embodiments of the present application; Figure 5 A schematic diagram of a three-dimensional structure of a first structure of a battery module provided in some embodiments of the present application from another perspective; Figure 6 A front view of a first structure of a battery module provided in some embodiments of the present application; Figure 7 A schematic diagram of a three-dimensional structure of a first battery cell provided in some embodiments of the present application; Figure 8 A perspective exploded view of a first battery cell provided for some embodiments of the present application; Fig. 9A schematic diagram of a three-dimensional structure of a second battery cell provided in some embodiments of the present application; Fig.10 A perspective exploded view of a second battery cell provided for some embodiments of the present application; Fig.11 A partial three-dimensional structural schematic diagram of a second structure of a battery provided in some embodiments of the present application; Fig.12 A schematic diagram of a three-dimensional structure from one perspective of a second structure of a battery module provided in some embodiments of the present application; Fig.13 A schematic diagram of a three-dimensional structure from another perspective of a second structure of a battery module provided in some embodiments of the present application;

[0095] Fig.14 A top view of a second structure of a battery module provided in some embodiments of the present application; Fig.15 A schematic diagram of a three-dimensional structure of a battery module according to some embodiments of the present application; Fig.16 A front view of a third structure of a battery module provided in some embodiments of the present application; Fig.17 A side view of a third structure of a battery module provided for some embodiments of the present application; Fig.18 A top view of a third structure of a battery module provided for some embodiments of the present application.

[0096] For ease of explanation, Figures 3 to 18 As shown by the arrows in , the direction of arrow Z is the first direction, the direction of arrow Y is the second direction, and the direction of arrow X is the third direction. The first direction Z, the second direction Y and the third direction X are perpendicular to each other. Sometimes the direction indicated by the first direction Z is referred to as "upper", and the opposite direction is referred to as "lower".

[0097] Please refer to Figures 2 to 18 In a first aspect of the present application, a battery 100 is provided. The battery 100 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 storage space is provided between the two. The at least one first battery cell 1 and the at least one second battery cell 2 are both arranged in the storage space. The first battery cell 1 is arranged close to the lower box plate 1021 relative to the second battery cell 2, and the second battery cell 2 is arranged close 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.

[0098] 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 located 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 close to the lower box plate 1021 relative to the second battery cell 2, and the second battery cell 2 is close 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 the position height of the second battery cell 2, and the first battery cell 1 is closer to the space below the lower box plate 1021 than the second battery cell 2.

[0099] The first battery cell 1 is arranged close to the lower box plate 1021 relative to the second battery cell 2 and the second battery cell 2 is arranged close to the upper box plate 1011 relative to the first battery cell 1, which means that the first battery cell 1 can be located directly below the second battery cell 2, that is, the first battery cell 1 and the second battery cell 2 have an overlapping part in the vertical direction (first direction Z), and the first battery cell 1 can also be located 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.

[0100] The storage space of the battery 100 can accommodate 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 near the lower box plate 1021 relative to the second battery cell 2, and the second battery cell 2 is arranged near 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 mixed connection.

[0101] When the battery 100 provided in the present application is installed in an electric vehicle, the lower box plate 1021 is closer to the external environment (the space under the electric vehicle) than the upper box plate 1011, so that the first battery cell 1 close to the lower box plate 1021 is closer to the external environment than the second battery cell 2, and the temperature of the first battery cell 1 is more susceptible to the external environment. When the electric vehicle is in a low temperature environment, the temperature of the external environment is low. Since the first battery cell 1 is close to the external environment, the temperature of the first battery cell 1 is relatively low, while the temperature of the second battery cell 2 is relatively high.

[0102] Sodium ion batteries are batteries that mainly rely on the movement of sodium ions between the positive electrode and the negative electrode to work. During the charging process, sodium ions are deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte; during the charging process, sodium ions are deintercalated from the negative electrode and intercalated into the positive electrode through the electrolyte. The first battery cell 1 adopts but is not limited to sodium oxide batteries, sodium polyanion batteries, sodium sulfur batteries, etc.

[0103] Sodium ion batteries have good low temperature resistance, that is, the low temperature capacity retention rate of sodium ion batteries is relatively high. Therefore, the first battery cell 1 adopts a sodium ion battery, so that the charge and discharge capacity of the first battery cell 1 is less affected by low temperature, thereby making the charge and discharge capacity of the first battery cell 1 higher, so that the battery 100 also has a higher charge and discharge capacity when used in a low temperature environment.

[0104] Lithium-ion batteries are batteries that mainly rely on the movement of lithium ions between the positive electrode and the negative electrode to work. During the charging process, lithium ions are deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte; during the charging process, lithium ions are deintercalated from the negative electrode and intercalated into the positive electrode through the electrolyte. The second battery cell 2 adopts but is not limited to lithium cobalt oxide batteries, lithium iron phosphate batteries, ternary lithium batteries, lithium manganese oxide batteries, polymer lithium ion batteries, etc.

[0105] Since the low temperature resistance of lithium-ion batteries is relatively poor compared to sodium-ion batteries, that is, the low temperature capacity retention rate of sodium-ion batteries is higher than that of lithium-ion batteries. Since the second battery cell 2 is relatively far from the external environment, the charge and discharge capacity of the second battery cell 2 is less affected by the external environment, which makes the temperature of the second battery cell 2 relatively high. For this reason, the second battery cell 2 adopts a lithium-ion battery, and the battery 100 also has a higher charge and discharge capacity when used in a low temperature environment. Moreover, the energy density of lithium-ion batteries is generally higher than that of sodium-ion batteries. The second battery cell 2 adopts a lithium-ion battery, which can improve the overall energy density of the battery 100 and is more conducive to improving the overall charge and discharge capacity of the battery 100.

[0106] Low temperature capacity retention rate refers to the ratio of the charge and discharge capacity of a battery cell when it is charged or discharged in a low temperature environment to its charge and discharge capacity at a standard temperature (usually room temperature, such as 20°C or 25°C). This indicator reflects the performance of the battery under low temperature conditions and is an important parameter for measuring the low temperature resistance of the battery. The low temperature capacity retention rate of a battery cell is related to the formulation of the electrolyte, the material of the electrode, etc.

[0107] The first battery cell 1 may be a hard-shell battery cell or a soft-pack battery cell, and the second battery cell 2 may be a hard-shell battery cell or a soft-pack battery cell.

[0108] The first battery cell 1 is a sodium ion battery, and the second battery cell 2 is 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. 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 little effect on the charge and discharge capacity of the first battery cell 1. Therefore, the first battery cell 1 can also maintain a high charge and discharge capacity in a low temperature state. Moreover, since the second battery cell 2 is 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, 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 low, its charge and discharge capacity is also less affected. That is, the charge and discharge capacity of the second battery cell 2 is also relatively high, so that the battery 100 including the first battery cell 1 and the second battery cell 2 has a high charge and discharge capacity when used in a low temperature environment. Moreover, since low temperature has little effect on the charge and discharge capacity of the first battery cell 1 , the difference in charging capacity between the first battery cell 1 and the second battery cell 2 is small, the probability of lithium deposition in the first battery cell 1 can be reduced.

[0109] In some embodiments, the second battery cell 2 is a lithium iron phosphate battery or a ternary lithium battery.

[0110] Lithium iron phosphate battery uses lithium iron phosphate (LiFePO 4 ) as the positive electrode material and carbon as the negative electrode material. Ternary lithium battery is a lithium battery with a ternary positive electrode material of lithium nickel cobalt manganese oxide (Li(NiCoMn)O2) or lithium nickel cobalt aluminum oxide.

[0111] Both lithium iron phosphate batteries and ternary lithium batteries have the characteristics of high energy density. Therefore, the second battery cell 2 uses a lithium iron phosphate battery or a ternary lithium battery to improve the overall energy density of the battery 100, and is more conducive to improving the overall charge and discharge capacity of the battery 100.

[0112] In some embodiments of the present application, the first battery cell 1 and the second battery cell 2 have overlapping portions along the vertical direction (first direction Z).

[0113] 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 because the low temperature capacity retention rate of the first battery cell 1 is relatively high, the low temperature has a relatively small effect 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, due to the barrier of the first battery cell 1, the effect 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. In this way, even if the low temperature capacity retention rate of the second battery cell 2 is low, the effect on its charge and discharge capacity is relatively small, that is, the charge and discharge capacity of the second battery cell 2 is also relatively high, so that the battery 100 including the first battery cell 1 and the second battery cell 2 has a relatively high charge and discharge capacity when used in a low temperature environment. Moreover, since the low temperature has a relatively small effect on the charge and discharge capacity of the first battery cell 1, 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 deposition in the first battery cell 1.

[0114] In some embodiments, the second battery cell 2 is disposed 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 the second direction Y perpendicular to the first direction Z.

[0115] For example, Fig.15 and Fig.16 As shown, 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 and discharge capacity of the second battery cell 2, which is beneficial to further improve the charge and discharge capacity of the battery 100.

[0116] For example, Figure 4 , Figure 5 , Fig.12 and Fig.13 As shown, the first battery cells 1 are arranged along the second direction Y, so that the area of ​​the first battery cells 1 blocking the external environment and the second battery cells 2 is larger, so that more second battery cells 2 can be arranged, thereby increasing the charge and discharge capacity of the entire battery 100.

[0117] Exemplarily, the first battery cells 1 are arranged along the first direction Z and along the second direction Y, so that the first battery cells 1 blocking the external environment and the second battery cells 2 have a larger area and have multiple layers, which can better reduce the impact of the external temperature on the temperature of the second battery cells 2, and more second battery cells 2 can be provided, thereby increasing the charge and discharge capacity of the entire battery 100.

[0118] In this way, by arranging a plurality of first battery cells 1 on the first surface 113 of the first battery cell 1 , the charge and discharge capacity of the entire battery 100 is increased.

[0119] In some embodiments, Figure 7 and Figure 8 As shown, the first battery cell 1 includes a first housing 11 and a first electrode assembly 12 . The first electrode assembly 12 is disposed in the first housing 11 . The first surface 113 is the largest surface of the first housing 11 .

[0120] 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 accommodating cavity isolated from the external environment. The first accommodating cavity is used to accommodate the first electrode assembly 12, the electrolyte and other components. The first shell 11 can be of various shapes and sizes, such as a rectangular parallelepiped, 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. 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.

[0121] The first electrode assembly 12 is a component in the first battery cell 1 where an electrochemical reaction occurs. The first housing 11 may contain one, two or more first electrode assemblies 12. When there are more than two 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 a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the first electrode assembly 12, and the parts of the positive electrode sheet and the negative electrode sheet without active materials 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 pole tab and the negative pole tab of the first electrode assembly 12 are respectively connected to a first pole 13. During the charge and discharge process of the first battery cell 1, the positive active material and the negative active material react with the electrolyte, and the electrons pass through the closed electrical circuit to form a current loop. In some examples, the first battery cell 1 is a soft-pack battery cell, the first shell 11 includes two layers of soft films, the two layers of soft films 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 joint between the two layers of soft films.

[0122] The first surface 113 is the surface with the largest area of ​​the first shell 11, so that the area of ​​the first battery cell 1 blocking the external environment and the second battery cell 2 is larger, so that more second battery cells 2 can be arranged, thereby increasing the charge and discharge capacity of the battery module 20, and further increasing the charge and discharge capacity of the entire battery 100.

[0123] In some embodiments, a ratio of an area of ​​the first surface 113 to a dimension of the first housing 11 along the first direction Z is not less than 480.

[0124] In this way, the first battery cell 1 is made flatter, and the area of ​​the first surface 113 of the first battery cell 1 of the same volume is larger, so that the area of ​​the first battery cell 1 blocking the external environment and the second battery cell 2 is larger, so that more second battery cells 2 can be arranged, thereby increasing the charge and discharge capacity of the battery module 20, and further increasing the charge and discharge capacity of the entire battery 100.

[0125] In some embodiments, a ratio of an area of ​​the first surface 113 to a dimension of the first housing 11 along the first direction Z is in a range of 480 to 9000.

[0126] Exemplarily, 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.

[0127] In some embodiments, the first housing 11 is made of aluminum and / or steel.

[0128] Exemplarily, the first housing 11 is an aluminum shell, that is, the entire first housing 11 is made of aluminum. Exemplarily, the first housing 11 is a steel shell, that is, the entire first housing 11 is made of steel. Exemplarily, the first housing 11 is an aluminum shell and a steel shell, that is, part of the first housing 11 is made of aluminum and the other part is made of steel.

[0129] The first housing 11 is made of aluminum and / or steel, so that the first housing 11 is a hard shell, and the first battery cell 1 is a hard shell battery cell. In this way, the first housing 11 has a certain hardness and strength, and the first housing 11 is not easily deformed when squeezed or collided, so that the first battery cell 1 can have a higher structural strength and the safety performance can also be improved.

[0130] In some embodiments, Figure 8 As shown, the first housing 11 includes a first end cover 111 and a first shell 112 . The first shell 112 has an opening. The first end cover 111 closes the opening of the first shell 112 to form a first accommodating cavity. The first electrode assembly 12 is disposed in the first accommodating cavity.

[0131] The first end cover 111 refers to a component that covers the opening of the first shell 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 112 to match the first shell 112. Optionally, the first end cover 111 can be made of a material with a certain hardness and strength, so that the first end cover 111 is not easily deformed when squeezed and collided, so that the first battery cell 1 can have a higher structural strength and the safety performance can also be improved.

[0132] In some embodiments of the present application, a first pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the first battery cell 1 reaches a threshold value may also be provided on the first end cover 111. The first end cover 111 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0133] In some embodiments of the present application, an insulating member may be provided inside the first end cover 111, and the insulating member may be used to isolate the electrical connection components in the first housing 112 from the first end cover 111 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

[0134] The first shell 112 is a component used to cooperate with the first end cap 111 to form the 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 cap 111 can be independent components, and an opening can be set on the first shell 112, and the internal environment of the first battery cell 1 is formed by covering the opening with the first end cap 111 at the opening. Without limitation, the first end cap 111 and the first shell 112 can also be integrated. Specifically, the first end cap 111 and the first shell 112 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the first shell 112, the first end cap 111 covers the first shell 112. The first shell 112 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, 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 first housing 112 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0135] In some embodiments of the present application, Figure 7 As shown, 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 to each other along the second direction Y. The first shell 11 also has two surfaces perpendicular to the third direction X and opposite to each other along the third direction X. Both the first direction Z and the second direction Y are perpendicular to the third direction X.

[0136] In this way, the first housing 11 is formed into a cubic shell, which facilitates the assembly of the second battery cell 2 on the first battery cell 1 and improves the structural reliability of the second battery cell 2 and the first battery cell 1 as a group.

[0137] In some embodiments of the present application, Figure 4 yes Figure 6 As shown, 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 cells 2 are arranged along the first direction Z; or, the second battery cells 2 are arranged along the second direction Y; or, the second battery cells 2 are arranged along the third direction X.

[0138] Thus, the dimension of the first housing 11 along the third direction X is the length of the first housing 11, the dimension of the first housing 11 along the second direction Y is the width of the first housing 11, and the dimension of the first housing 11 along the third direction X is the thickness of the first housing 11. A plurality of second battery cells 2 are arranged, thereby increasing the charge and discharge capacity of the battery module 20, and further increasing the battery capacity of the entire battery 100.

[0139] In some embodiments of the present application, Figure 4 , Figure 5 , Fig.12 and Fig.13 As shown, the first battery cells 1 are arranged along the second direction Y, and at least one first pole 13 is disposed on two opposite surfaces of the first housing 11 of the first battery cell 1 along the third direction X.

[0140] In some embodiments of the present application, Figures 4 to 6 As shown, the second battery cells 2 are arranged along the third direction X, and along the third direction X, the sum of the sizes of the plurality of second battery cells 2 is equal to the size of the first housing 11 of the first battery cell 1. Along the third direction X, the surface of the first second battery cell 2 that faces away from the second second battery cell 2 is flush with the end surface of the first housing 11 along the third direction X, and the surface of the last second battery cell 2 that faces away from the last second battery cell 2 is flush with the end surface of the first housing 11 along the third direction X.

[0141] In this way, the first battery cell 1 and the second battery cell 2 form a regular cuboid, which is beneficial to improving the energy density of the battery module 20 composed of the first battery cell 1 and the second battery cell 2, thereby increasing the charge and discharge capacity of the battery 100.

[0142] In some embodiments of the present application, the first housing 11 is made of aluminum-plastic film.

[0143] 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 electrode tab and the negative electrode tab 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 surfaces opposite to each other along the first direction Z, and one of the two surfaces is the first surface 113.

[0144] Thus, the first housing 11 is made of aluminum-plastic film, so that the first battery cell 1 is a soft-pack battery cell, which has a high energy density, thereby improving the energy density of the battery module 20 and further improving the energy density of the battery 100 .

[0145] In some embodiments of the present application, the first housing 11 is made of aluminum-plastic film, the size of the first surface 113 of the first battery cell 1 along the third direction X is greater than the size along the second direction Y, and the second battery cells 2 are arranged along the second direction Y.

[0146] In this way, the first battery cell 1 is a soft-pack battery cell, and the second battery cells 2 are arranged on the first surface 113 of the first battery cell 1 along the second direction Y, thereby improving the energy density of the battery module 20 and the battery capacity of the entire battery 100 .

[0147] In some embodiments of the present application, Fig. 9 and Fig.10 As shown, the second battery cell 2 includes a second housing 21 , a second electrode assembly 22 disposed in the second housing 21 , and a second pole 23 disposed in the second housing 21 , and the second pole 23 is connected to the second electrode assembly 22 .

[0148] The second housing 21 is a component having a second accommodating cavity isolated from the external environment. The second accommodating cavity is used to accommodate the second electrode assembly 22, electrolyte and other components. The second housing 21 can be in various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism or a cylindrical shape. Specifically, the shape of the second housing 21 can be determined according to the specific shape and size of the second electrode assembly 22. The material of the second housing 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0149] The second electrode assembly 22 is a component where electrochemical reactions occur in the second battery cell 2. The second housing 21 may contain one, two or more second electrode assemblies 22. When there are more than two 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 the positive electrode sheet and the negative electrode sheet, and an isolation member is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the second electrode assembly 22, and the parts of the positive electrode sheet and the negative electrode sheet without active materials constitute the positive electrode ear and the negative electrode ear, respectively. During the charge and discharge process of the second battery cell 2, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrons pass through the closed electrical circuit to form a current circuit.

[0150] In this way, the second battery cell 2 forms a basic unit that can realize the mutual conversion of chemical energy and electrical energy. In addition, 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 charge and discharge capacity in a low-temperature state, and 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, so that even if the low-temperature capacity retention rate of the second battery cell 2 is relatively low, its charge and discharge capacity is also less affected, that is, the charge and discharge capacity of the second battery cell 2 is also relatively high, so that the battery 100 including the first battery cell 1 and the second battery cell 2 has a relatively high charge and discharge capacity when used in a low-temperature environment.

[0151] In some embodiments, Fig.10 As shown, the second housing 21 includes a second end cover 211 and a second shell 212 . The second shell 212 has an opening. The second end cover 211 closes the opening of the second shell 212 to form a second accommodating cavity. The second electrode assembly 22 is disposed in the second accommodating cavity.

[0152] 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 cell 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 match the second shell 212. Optionally, the second end cover 211 can be made of a material with a certain hardness and strength, so that the second end cover 211 is not easily deformed when squeezed and collided, so that the second battery cell 2 can have a higher structural strength and the safety performance can also be improved.

[0153] In some embodiments of the present application, a second pressure relief mechanism 24 for releasing the internal pressure when the internal pressure or temperature of the second battery cell 2 reaches a threshold value may also be provided on the second end cover 211. The second end cover 211 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0154] In some embodiments of the present application, an insulating member may be provided inside the second end cover 211, and the insulating member may be used to isolate the electrical connection components in the second housing 212 from the second end cover 211 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

[0155] The second shell 212 is a component used to cooperate with the second end cap 211 to form the internal environment of the second battery cell 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 cap 211 can be independent components, and an opening can be set on the second shell 212, and the second end cap 211 is made to cover the opening at the opening to form the internal environment of the second battery cell 2. Without limitation, the second end cap 211 and the second shell 212 can also be integrated. Specifically, the second end cap 211 and the second shell 212 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the second shell 212, the second end cap 211 is made to cover the second shell 212. The second shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a 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 second shell 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special limitation on this.

[0156] In some embodiments of the present application, Fig. 9 As shown, the second housing 21 is a cubic shell, including two opposite second surfaces 213 . The second surface 213 is the surface with the largest area of ​​the second housing 21 . The second battery cells 2 are arranged along a direction perpendicular to the second surface 213 .

[0157] Thus, the second battery cells 2 are square shell batteries, and the second battery cells 2 are arranged along the thickness direction thereof. The second battery cells 2 are grouped together with high structural strength, so that the structural strength of the battery module 20 is high, and thus the structural strength of the battery 100 is high.

[0158] In some embodiments of the present application, 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 both the first direction Z and the second direction Y are perpendicular to the third direction X.

[0159] In this way, 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 includes the plurality of second battery cells 2, thereby increasing the battery capacity of the battery module 20 and further increasing the battery capacity of the battery 100.

[0160] like Figures 4 to 6 As shown, in some embodiments of the present application, the second battery cells 2 are arranged along the third direction X, and the second poles 23 are disposed on the upper surface of the second housing 21 of the second battery cells 2 .

[0161] In some embodiments of the present application, Figures 12 to 18 As shown, the second housing 21 is a cylindrical housing, and the central axis of the second housing 21 of the second battery cell 2 extends along the first direction Z; or, the central axis of the second housing 21 of the second battery cell 2 extends along the second direction Y.

[0162] In some embodiments of the present application, Figures 12 to 18 As shown, the first surface 113 is a rectangle, 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 that is perpendicular to both 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.

[0163] In this way, the second battery cell 2 is a cylindrical battery, and the axial direction of the second battery cell 2 is consistent with the length direction of the first battery cell 1 , which is beneficial to improve the bending strength of the battery module 20 along the third direction X, thereby improving the structural strength of the battery 100 .

[0164] In some embodiments of the present application, the second battery cells 2 are arranged along the second direction Y.

[0165] In this way, the second battery cells 2 are arranged along the second direction Y, so that a plurality of second battery cells 2 are arranged on the first surface 113 of the first battery cell 1 , thereby increasing the battery capacity of the battery module 20 and the battery capacity of the battery 100 .

[0166] In some embodiments of the present application, Fig.12 and Fig.13 As shown, the second battery cells 2 are arranged in at least two columns along the first direction Z, the second battery cells 2 in two adjacent columns are staggered along the first direction Z, and the second battery cells 2 located in odd columns are aligned along the first direction Z, and the second battery cells 2 located in even columns are aligned along the first direction Z.

[0167] For example, Fig.12 and Fig.13 As shown, 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 .

[0168] “The second battery cells 2 in two adjacent columns are staggered along the first direction Z” means that, viewed along the first direction Z, the second battery cells 2 in two adjacent columns are staggered and not aligned.

[0169] By staggering adjacent columns, part of the second battery cells 2 in one column are accommodated in the recessed space formed between two adjacent second battery cells 2 in another column. The space arrangement is reasonable, which not only saves space but also improves the reliability of the grouping between the second battery cells 2, thereby improving the structural strength of the battery module 20, thereby improving the structural strength of the battery 100.

[0170] In some embodiments of the present application, the size of the second shell 21 of the second battery cell 2 along the third direction X is equal to the size of the first shell 11 of the first battery cell 1 along the third direction X, and the two end edges of the second shell 21 along the third direction X are respectively aligned with the two end edges of the first shell 11 along the third direction X.

[0171] In this way, the reliability of the grouping of the first battery cell 1 and the second battery cell 2 is improved, and the energy density of the battery module 20 is improved, thereby improving the structural strength and energy density of the battery 100.

[0172] A second aspect of the present application provides an energy storage device, comprising at least one battery 100 provided in the first aspect.

[0173] Since the energy storage device includes the battery 100, the energy storage device has all the beneficial effects of the battery 100, so the charge and discharge capacity of the energy storage device is improved and the probability of lithium deposition is low.

[0174] A third aspect of the present application provides an electrical device, the electrical device comprising at least one battery 100 provided by the first aspect for providing electrical energy.

[0175] Since the electric device includes the battery 100 , the electric device has all the beneficial effects of the battery 100 , and therefore, the charge and discharge capacity of the electric device is improved and the probability of lithium deposition is low.

[0176] Specific examples of some embodiments of the present application are described below with reference to the accompanying drawings.

[0177] As a specific example, Figures 4 to 6 As shown, a sodium battery (first battery cell 1) is arranged at the bottom of the battery pack (battery 100). The sodium battery is a square-shell battery with poles (first poles 13) at opposite ends of the sodium battery. The sodium battery lies flat and side by side at the bottom of the battery box (battery box 10). A thermal conductive adhesive is applied between the large surface of the sodium battery and the bottom surface of the battery box to facilitate heat exchange. A square-shell lithium iron phosphate battery (second battery cell 2) is placed on top of the sodium battery. The lithium iron phosphate battery stands upright on top of the sodium battery. 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 dimension of the lithium iron phosphate battery is equal to the length of the sodium battery when placed side by side, which is convenient for maximizing the use of the battery pack space.

[0178] As a specific example, Figure 12 to Figure 14 As shown, the bottom of the battery pack (battery 100) is a square-shell sodium battery (first battery cell 1), and the opposite ends of the sodium battery have poles (first poles 13). The sodium batteries lie flat and side by side at the bottom of the battery box (battery box 10) to keep warm. A ternary cylindrical battery (second battery cell 2) extending along the length of the sodium battery is arranged above the sodium battery, and the upper and lower layers of the cylindrical batteries are staggered. The length of the cylindrical battery is equal to that of the sodium battery, which plays a role in strengthening the structural strength of the battery pack.

[0179] As a specific example, Figures 15 to 18 As shown, the bottom of the battery pack (battery 100) is a soft-pack sodium battery (first battery cell 1), and the sodium battery is provided with two layers in the vertical direction. The sodium battery has tabs at both ends, and a cylindrical lithium battery (second battery cell 2) is provided on the upper part of the sodium battery, and the axial direction of the lithium battery is parallel to the extension direction of the tabs of the soft-pack sodium battery. The cylindrical lithium battery can be lithium iron phosphate or a ternary battery. The cylindrical lithium battery has one, two or three layers in the vertical direction.

[0180] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above 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 application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery, characterized in that: include: The battery box comprises an upper box plate and a lower box plate, wherein the upper box plate is arranged above the lower box plate, and a storage space is arranged between the upper box plate and the lower box plate; At least one first battery cell and at least one second battery cell are both arranged in the accommodation 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 is a sodium ion battery, and the second battery cell is a lithium ion battery.

2. The battery according to claim 1, characterized in that The second battery cell is a lithium iron phosphate battery or a ternary lithium battery.

3. The battery according to any one of claims 1 or 2, characterized in that The second battery cell is disposed on a 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, characterized in that The first battery cell includes a first housing and a first electrode assembly, wherein the first electrode assembly is disposed in the first housing. The first surface is a surface of the first shell with the largest area.

5. The battery according to claim 4, characterized in that A ratio of an area of ​​the first surface to a dimension of the first shell along the first direction is not less than 480.

6. The battery according to claim 4 or 5, characterized in that: The first housing is made of aluminum and / or steel.

7. The battery according to claim 6, characterized in that The first housing has a surface perpendicular to the first direction and opposite to the first surface along the first direction. The first housing also has two surfaces perpendicular to the second direction and opposite to each other along the second direction. The first housing further has two surfaces which are perpendicular to a third direction and opposite to each other along the third direction, and both the first direction and the second direction are perpendicular to the third direction.

8. The battery according to claim 7, characterized in that The size of the first shell along the third direction is larger than the size along the second direction, and the size of the first shell along the second direction is larger than the size along the first direction. The second battery cells are arranged along the first direction; or The second battery cells are arranged along the second direction; or The second battery cells are arranged along the third direction.

9. The battery according to claim 4 or 5, characterized in that: The first shell is made of aluminum-plastic film.

10. The battery according to claim 4, 5 or 7, characterized in that: The second battery cell includes a second outer shell, a second electrode assembly disposed in the second outer shell, and a second pole disposed in the second outer shell, wherein the second pole is connected to the second electrode assembly.

11. The battery according to claim 10, characterized in that The second shell is a cubic shell, including two opposite second surfaces, wherein the second surface is the surface with the largest area of ​​the second shell. The second battery cells are arranged along a direction perpendicular to the second surface.

12. The battery according to claim 11, characterized in that 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 a third direction, and both the first direction and the second direction are perpendicular to the third direction.

13. The battery according to claim 10, characterized in that The first surface is rectangular, the extension direction of the short side of the first surface is consistent with the second direction, and the extension direction of the long side of the first surface is consistent with a third direction perpendicular to both the first direction and the second direction. The second outer shell is a cylindrical shell, and a central axis of the second outer shell of the second battery cell extends along the third direction.

14. The battery according to claim 13, characterized in that The second battery cells are arranged along the second direction.

15. The battery according to claim 14, characterized in that The second battery cells are arranged in at least two columns along the first direction, the second battery cells in two adjacent columns are staggered along the first direction, and the second battery cells in odd columns are aligned along the first direction, while the second battery cells in even columns are aligned along the first direction.

16. An energy storage device, characterized in that: Comprising at least one battery according to any one of claims 1 to 15.

17. An electrical device, characterized in that: The electrical device comprises at least one battery according to any one of claims 1 to 15 for providing electrical energy.

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