Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a battery monomer provided with a positive electrode terminal and a negative electrode terminal; and the shunting assembly is electrically connected between the positive electrode terminal and the negative electrode terminal, and the resistance value of the shunting assembly is adjustable so as to adjust the magnitude of current flowing through the battery monomer. Through the mode, the consistency among the plurality of battery monomers in the battery device can be improved, and the service life of the battery device is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery device and an electrical device. Background Art

[0002] With the development of battery technology, battery devices are applied in more and more fields and gradually replace traditional fossil energy in the field of automotive power. A battery device can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery device, after discharging, the active substances can be activated by charging and continue to be used.

[0003] A battery device usually includes a plurality of battery cells to provide a higher voltage and capacity. In the prior art, when charging a battery device, a constant current charging mode is usually adopted. In the constant current charging mode, the magnitude of the current flowing through each battery cell is the same. However, in practical applications, due to the differences among the plurality of battery cells, such as differences in capacity, resistance, voltage, temperature, etc., the constant current charging mode will cause the aging rate of the more severely aged battery cells to accelerate. As time goes by, the differences among each battery cell will be further enlarged, resulting in poor consistency among the battery cells in the battery device. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the consistency among a plurality of battery cells in the battery device and improve the service life of the battery device.

[0005] In a first aspect, the present application provides a battery device, which includes a battery cell provided with a positive electrode terminal and a negative electrode terminal; a shunt component electrically connected between the positive electrode terminal and the negative electrode terminal and configured to have an adjustable resistance value to adjust the magnitude of the current flowing through the battery cell. In this way, the shunt component can be made to be in parallel with the battery cell, and further, the shunt component can be used to shunt the current flowing through the battery cell; further, since the resistance value of the shunt component is adjustable, the shunt effect can be adjusted by adjusting the resistance value of the shunt component, that is, the magnitude of the current flowing through the corresponding battery cell can be adjusted; during the charging and discharging process, this design can adjust the current flowing through the battery cell according to the self-state of the battery cell to achieve differential charging. Therefore, the consistency of the charge and discharge rates among a plurality of battery cells in the battery device can be improved, and further, the consistency among a plurality of battery cells in the battery device can be improved, and the service life of the battery device can be increased.

[0006] In some embodiments, the shunt component includes a variable resistor connected in series between the positive electrode terminal and the negative electrode terminal. In this way, the resistance value of the shunt component can be adjusted by using the variable resistor, the shunt current can be flexibly controlled, the number of fixed resistors in the circuit can be reduced, and the assembly complexity can be lowered.

[0007] In some embodiments, the battery device further includes a cooling mechanism, and at least a part of the shunt component is disposed on the side surface of the cooling mechanism. In this way, by disposing the shunt component on the side surface of the cooling mechanism, the shunt component can be disposed close to the cooling mechanism, so that the cooling mechanism can be used to cool down the shunt component, and the use safety can be improved.

[0008] In some embodiments, the cooling mechanism is disposed between two adjacent battery cells along a first direction; the battery cell has two first end faces spaced apart along a second direction, the positive electrode terminal and the negative electrode terminal are located on the first end face, the cooling mechanism has two second end faces spaced apart along the second direction, and at least a part of the shunt component is disposed on the second end face of the cooling mechanism; wherein, the first direction is perpendicular to the second direction. In this way, by disposing the cooling mechanism between adjacent battery cells along the first direction, the cooling effect on the battery cells can be improved; the positive electrode terminal and the negative electrode terminal are located on the first end face, so that the positive electrode terminal and the negative electrode terminal can be arranged along the second direction with the main body part of the battery cell, the layout can be optimized, and the size of the battery device in the first direction can be reduced; at least a part of the shunt component is disposed on the second end face of the cooling mechanism, so that the shunt component and the battery cells can be reasonably distributed around the cooling mechanism, the cooling mechanism can not only directly cool down the battery cells, but also directly cool down the shunt component, and the overall space utilization rate can be improved, and the miniaturization of the battery device can be achieved.

[0009] In some embodiments, at least one second end face is recessed toward the other second end face relative to the first end face disposed on the same side, so as to form a first installation groove on at least one second end face, and at least a part of the shunt component is disposed in the first installation groove. In this way, the installation space formed by the first installation groove can be used to dispose the shunt component, the space utilization rate can be improved, and it is beneficial to the miniaturization of the battery device.

[0010] In some embodiments, the battery cell has two first end faces spaced along a second direction, and at least one of the positive electrode terminal and the negative electrode terminal protrudes from the corresponding first end face to form a second mounting groove on the first end face where at least one of the positive electrode terminal and the negative electrode terminal is provided. At least a part of the shunt component is located in at least one second mounting groove. In the above manner, the second mounting groove can be formed on the first end face by using the positive electrode terminal or the negative electrode terminal. Setting the shunt component in the second mounting groove can achieve the positioning effect of the shunt component, and can simplify the electrical connection structure between the shunt component, the positive electrode terminal and the negative electrode terminal, reducing redundant wiring; and the above setting can make full use of the space around the battery cell to set the shunt component, improving the structural compactness of the battery device and realizing miniaturization.

[0011] In some embodiments, the shunt component is located on the first end face of the battery cell where at least one of the positive electrode terminal and the negative electrode terminal is provided, and the end face of the shunt component facing away from the battery cell is lower than or flush with the outer end face of the electrode terminal provided on the same side. The electrode terminal includes at least one of the positive electrode terminal and the negative electrode terminal. In the above manner, the shunt component can be arranged on the first end face of the battery cell where the electrode terminal is provided, enabling the shunt component and the electrode terminal to share the space on the first end face, and reducing the size of the battery cell in the second direction; further, setting the end face of the shunt component facing away from the battery cell to be lower than or flush with the outer end face of the electrode terminal provided on the same side can reduce the size of the battery cell in the second direction by reducing the height of the shunt component in the second direction, improving the compactness of the overall structure, enhancing the miniaturization of the battery device, and reducing the impact of external extrusion on the shunt component.

[0012] In some embodiments, the shunt component is located on the first end face of the battery cell where at least one of the positive electrode terminal and the negative electrode terminal is provided, and an explosion-proof valve is further provided on the first end face; the projection of the shunt component on the first end face is spaced from at least one of the positive electrode terminal and the negative electrode terminal and the explosion-proof valve on the same first end face. In the above manner, arranging the shunt component on the first end face of the battery cell where the electrode terminal (such as the positive electrode terminal or the negative electrode terminal) is provided can enable the shunt component and the electrode terminal to share the space on the first end face, reducing the size of the battery cell in the direction perpendicular to the first end face; providing an explosion-proof valve on the first end face of the battery cell, and the projection of the shunt component on the first end face being spaced from the electrode terminal and the explosion-proof valve on this first end face can reduce the interference among the shunt component, the explosion-proof valve and the electrode terminal, improving the reliability and safety of the battery device.

[0013] In some embodiments, the positive electrode terminal and the negative electrode terminal are located on the same first end face of the battery cell. By the above method, the space on the same first end face can be shared by the positive electrode terminal and the negative electrode terminal, the size of the battery cell in the second direction can be reduced, and the structural compactness of the battery device can be improved.

[0014] In some embodiments, along the third direction, the explosion-proof valve is located between the positive electrode terminal and the negative electrode terminal, the shunt component is located between the positive electrode terminal and the explosion-proof valve, or the shunt component is located between the negative electrode terminal and the explosion-proof valve; the third direction is the arrangement direction of the positive electrode terminal and the negative electrode terminal. By the above method, the explosion-proof valve is located between the positive electrode terminal and the negative electrode terminal, and the shunt component is located between the positive electrode terminal and the explosion-proof valve, so that the positive electrode terminal, the shunt component, the explosion-proof valve, and the negative electrode terminal can be arranged along the third direction, or the negative electrode terminal, the shunt component, the explosion-proof valve, and the positive electrode terminal can be arranged along the third direction. Therefore, the size of the battery device in the direction perpendicular to the third direction can be reduced, and the overall structural compactness can be improved.

[0015] In some embodiments, the shunt component is connected in series between the positive electrode terminal and the negative electrode terminal through a conducting wire. By the above method, using the conducting wire to connect the shunt component with the positive electrode terminal and the negative electrode terminal can improve the connection flexibility, reduce the position limitation on the shunt component, the positive electrode terminal, and the negative electrode terminal, and reduce the cost.

[0016] In some embodiments, at least one of the positive electrode terminal and the negative electrode terminal is further electrically connected to a bus bar, and the shunt component is electrically connected to the corresponding positive electrode terminal or negative electrode terminal through the bus bar. By the above method, using the bus bar to connect the shunt component with the positive electrode terminal or the negative electrode terminal can reduce the contact resistance, reduce the local heating condition, and improve the service life of the battery device.

[0017] In some embodiments, the battery cell includes: a housing forming a receiving cavity with an opening, an electrode assembly disposed in the receiving cavity, and an end cap covering the opening, the end cap being provided with a positive electrode terminal and a negative electrode terminal; the variable resistor is provided with a first fixed end, a second fixed end, and a moving end, one of the first fixed end and the moving end is electrically connected to the positive electrode terminal, the other of the first fixed end and the moving end is electrically connected to the negative electrode terminal, and the second fixed end is suspended or connected to the housing. By the above method, the housing and the end cap can be used to form the internal environment of the battery cell, realizing the protection of the internal electrode assembly, and improving the structural strength and safety of the battery cell; the variable resistor is provided with a first fixed end, a second fixed end, and a moving end, and the resistance value can be adjusted by adjusting the moving end, with a simple structure.

[0018] In some embodiments, the positive electrode terminal and the negative electrode terminal are located on two first end faces of the battery cell that are oppositely arranged along the second direction. The battery device includes at least a plurality of battery cells, and a shunt component is disposed between adjacent battery cells; the second direction is perpendicular to the arrangement direction of the plurality of battery cells. In this way, the positive electrode terminal and the negative electrode terminal can be oppositely arranged on the two first end faces of the battery cell, forming a symmetrical layout, which facilitates the use of a mature winding process or lamination process inside the battery cell to form an electrode assembly, can maximize the use of space and reduce material waste; and being oppositely arranged on the two first end faces of the battery cell, the current directly reaches the negative electrode terminal from the positive electrode terminal through the electrode plate and then through the electrolyte, forming the shortest path, which can significantly reduce the internal resistance of the battery and can reduce the risk of local overheating caused by uneven current distribution; further, by arranging the shunt component between adjacent battery cells, the size of the battery device in the second direction can be reduced, and the structural layout can be optimized.

[0019] In some embodiments, the battery device further includes a sampling component, which is connected to the shunt component and is configured to obtain the operating parameters of the battery cell and adjust its resistance value based on the control parameters corresponding to the operating parameters. In this way, the sampling component can be used to obtain the operating parameters of the battery cell, and the sampling component can generate corresponding control parameters based on the operating parameters to adjust the resistance value of the shunt component, thereby enabling the adjustment of the current flowing through the battery cell, and further improving the consistency between the battery cells in the battery device.

[0020] In a second aspect, the present application provides an electrical device including the battery device according to any of the above embodiments. With this arrangement, the shunt component can be connected in parallel with the battery cell, thereby enabling the shunt component to shunt the current flowing through the battery cell; further, the resistance value of the shunt component is adjustable, and the shunt effect can be adjusted by adjusting the resistance value of the shunt component, that is, the magnitude of the current flowing through the corresponding battery cell can be adjusted; during the charging and discharging process, this design can adjust the current flowing through the battery cell according to the self-state of the battery cell, realizing differential charging, so that the consistency of the charge and discharge rates between multiple battery cells in the battery device can be improved, and further the consistency between multiple battery cells in the battery device can be improved, and the service life of the battery device can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0022] Figure 1Schematic structural diagram of an embodiment of the vehicle of the present application;

[0023] Figure 2 Exploded structural schematic diagram of a partial structure of the first embodiment of the battery device of the present application;

[0024] Figure 3 Exploded structural schematic diagram of a partial structure of the second embodiment of the battery device of the present application;

[0025] Figure 4 Exploded structural schematic diagram of a partial structure of the third embodiment of the battery device of the present application;

[0026] Figure 5 Top view structural schematic diagram of a partial structure of the fourth embodiment of the battery device of the present application;

[0027] Figure 6 Side view structural schematic diagram of a partial structure of the fifth embodiment of the battery device of the present application;

[0028] Figure 7 Side view structural schematic diagram of a partial structure of the sixth embodiment of the battery device of the present application;

[0029] Figure 8 Side view structural schematic diagram of a partial structure of the seventh embodiment of the battery device of the present application;

[0030] Figure 9 Side view structural schematic diagram of a partial structure of the eighth embodiment of the battery device of the present application;

[0031] Figure 10 Schematic structural diagram of an embodiment of a battery cell of the present application;

[0032] Figure 11 For Figure 10 Exploded structural schematic diagram of the battery cell shown;

[0033] Figure 12 Exploded structural schematic diagram of another embodiment of the battery cell of the present application;

[0034] Figure 13 Exploded structural schematic diagram of an embodiment of a variable resistor of the present application;

[0035] Figure 14 Schematic structural diagram of another embodiment of a battery cell of the present application;

[0036] Figure 15 Side view structural schematic diagram of a partial structure of the ninth embodiment of the battery device of the present application.

[0037] The reference numerals in the specific embodiments are as follows:

[0038] 1000a vehicle; 100a battery device; 200a controller; 300a motor; 10a housing; 11a first part; 12a second part; 1 battery cell; 100 casing; 110 housing; 120 end cap; 500 electrode assembly; 501 tab; 502 current collector; 11 electrode terminal; 12 explosion-proof valve; 13 first end face; 21 shunt assembly; 22 variable resistor; 23 first fixed end; 24 second fixed end; 25 moving end; 31 bus bar; 41 cooling mechanism; 42 second end face; 401 first mounting groove; x first direction; y second direction; z third direction. Detailed implementation manners

[0039] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0042] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0044] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0045] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "inside" and "outside" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0047] With the development of battery technology, battery devices are applied in more and more fields and gradually replace traditional fossil energy in the field of automotive power. A battery device can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery device, after discharging, the active substances can be activated by charging and continue to be used.

[0048] A battery device usually includes a plurality of battery cells to provide a higher voltage and capacity. In the prior art, when charging a battery device, a constant current charging mode is usually adopted. In the constant current charging mode, the magnitude of the current flowing through each battery cell is the same. However, in actual applications, due to the differences between multiple battery cells, such as differences in capacity, resistance, voltage, temperature, etc., the constant current charging mode will cause the aging speed of the battery cells with more serious aging to accelerate. As time goes by, the differences between each battery cell will be further enlarged, resulting in poor consistency of the battery cells in the battery device.

[0049] Based on the above considerations, the present application provides a battery device and an electrical device. The battery device includes battery cells and a shunt component. The battery cells are provided with a positive electrode terminal and a negative electrode terminal; the shunt component is electrically connected between the positive electrode terminal and the negative electrode terminal and is configured to have an adjustable resistance value to adjust the magnitude of the current flowing through the battery cells. In the above manner, the shunt component can be made to be in parallel with the battery cells, and thus the shunt component can be used to shunt the current flowing through the battery cells; further, since the resistance value of the shunt component is adjustable, the shunt effect can be adjusted by adjusting the resistance value of the shunt component, that is, the magnitude of the current flowing through the corresponding battery cells can be adjusted; during the charging and discharging process, this design can adjust the current flowing through the battery cells according to the self-state of the battery cells, so that the consistency of the charge and discharge rates among multiple battery cells in the battery device can be improved, and further the consistency among multiple battery cells in the battery device can be improved, and the service life of the battery device can be extended.

[0050] The battery device and the electrical device disclosed in the embodiments of the present application can be used in electrical devices that use the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0051] For the convenience of description in the following embodiments, a vehicle 1000a, which is an electrical device according to an embodiment of the present application, is taken as an example for description.

[0052] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of an embodiment of the vehicle of the present application. The vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, an extended-range electric vehicle, etc. A battery device 100a is disposed inside the vehicle 1000a, and the battery device 100a can be disposed at the bottom, the head, or the tail of the vehicle 1000a. The battery device 100a can be used for power supply of the vehicle 1000a. For example, the battery device 100a can be used as an operating power source of the vehicle 1000a. The vehicle 1000a can further include a controller 200a and a motor 300a. The controller 200a is used to control the battery device 100a to supply power to the motor 300a. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000a.

[0053] In some embodiments of the present application, the battery device 100a can not only serve as the operating power source of the vehicle 1000a, but also serve as the driving power source of the vehicle 1000a, providing driving power for the vehicle 1000a instead of or partially replacing fuel or natural gas.

[0054] In some embodiments, the battery device 100a can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0055] The battery device 100a mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

[0056] In the embodiments of the present application, the battery cell 1 can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use. Each battery cell 1 can also be a primary battery.

[0057] The battery cell 1 includes but is not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc. The battery cell 1 can be in the shape of a cylinder, a flat body, a cuboid or other shapes.

[0058] In some embodiments, the battery device 100a can be a battery module. When there are multiple battery cells 1, the multiple battery cells 1 are arranged and fixed to form a battery module.

[0059] In some embodiments, please refer to Figure 2 、 Figure 3 、 Figure 4 , Figure 2 which is a schematic exploded view of a part of the structure of the first embodiment of the battery device of the present application, Figure 3 which is a schematic exploded view of a part of the structure of the second embodiment of the battery device of the present application, Figure 4 which is a schematic exploded view of a part of the structure of the third embodiment of the battery device of the present application. The battery device 100a can be a battery pack, and the battery pack includes a box body 10a and battery cells 1, and the battery cells 1 or battery modules are accommodated in the box body 10a.

[0060] In some embodiments, the box body 10a can be a part of the chassis structure of the vehicle 1000a. For example, a part of the box body 10a can become at least a part of the floor of the vehicle 1000a, or a part of the box body 10a can become at least a part of the cross beam and longitudinal beam of the vehicle 1000a.

[0061] Please refer to Figure 2 、 Figure 3 、 Figure 4 , Figure 2Schematic exploded view of a partial structure of the first embodiment of the battery device of the present application Figure 3 Schematic exploded view of a partial structure of the second embodiment of the battery device of the present application Figure 4 Schematic exploded view of a partial structure of the third embodiment of the battery device of the present application. The battery device 100a includes a box body 10a and battery cells 1, and the battery cells 1 are accommodated in the box body 10a. Among them, the box body 10a is used to provide an accommodation space for the battery cells 1, and the box body 10a can adopt various structures. In some embodiments, the box body 10a may include a first part 11a and a second part 12a, the first part 11a and the second part 12a are covered with each other, and the first part 11a and the second part 12a jointly define an accommodation space for accommodating the battery cells 1. The second part 12a may be a hollow structure with one end open, and the first part 11a may be a plate-like structure. The first part 11a covers the open side of the second part 12a so that the first part 11a and the second part 12a jointly define an accommodation space; the first part 11a and the second part 12a may also both be hollow structures with one side open, and the open side of the first part 11a covers the open side of the second part 12a. Of course, the box body 10a formed by the first part 11a and the second part 12a can be various shapes, such as a cylinder, a cuboid, etc.

[0062] In the battery device 100a, there may be multiple battery cells 1, and the multiple battery cells 1 can be connected in series, parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 1. The multiple battery cells 1 can be directly connected in series, parallel or in a mixed connection together, and then the whole formed by the multiple battery cells 1 is accommodated in the box body 10a; of course, the battery device 100a can also be that multiple battery cells 1 are first connected in series, parallel or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, parallel or in a mixed connection to form a whole and are accommodated in the box body 10a. The battery device 100a may further include other structures. For example, the battery device 100a may further include a busbar component for realizing the electrical connection among the multiple battery cells 1.

[0063] In some embodiments, please refer to Figure 2 、 Figure 6 , Figure 2 Schematic exploded view of a partial structure of the first embodiment of the battery device of the present application Figure 6 Schematic side view of a partial structure of the fifth embodiment of the battery device of the present application. The battery device 100a includes a battery cell 1 and a shunt component 21. The battery cell 1 is provided with a positive electrode terminal and a negative electrode terminal; the shunt component 21 is electrically connected between the positive electrode terminal and the negative electrode terminal and is configured to have an adjustable resistance value to adjust the magnitude of the current flowing through the battery cell 1.

[0064] Among them, an electrode terminal 11 is provided on the battery cell 1, and the electrode terminal 11 includes a positive electrode terminal and a negative electrode terminal; the positive electrode terminal and the negative electrode terminal are components for the battery cell 1 to output electrical energy to the outside or receive electrical energy input from the outside.

[0065] Among them, the shunt component 21 has an adjustable resistance value. By setting the corresponding shunt component 21 for the battery cell 1, the magnitude of the current flowing through the corresponding battery cell 1 can be adjusted by adjusting the resistance value of the shunt component 21. Among them, the adjustable resistance value means that when the shunt component 21 is in the energized state, its resistance value has at least two different resistance values. During the charging and discharging process of the battery cell 1, the shunt component 21 can be connected to the branch where it is located with different resistance values.

[0066] In some application scenarios, the on-off control of the branch where the shunt component 21 is located can also be achieved by connecting a series switch component (not shown in the figure).

[0067] Specifically, due to process differences and fluctuations (such as the weight difference of the positive and negative active materials, the fluctuation of the electrolyte injection volume, etc.), each battery cell 1 actually has differences, such as capacity, resistance, voltage, etc.; if a constant current charging mode is adopted, in the battery device 100a, since the positions of each battery cell 1 are different, there will be a situation where the temperatures at various places in the battery device 100a are different during use, which will further expand the differences between the battery cells 1; as the use time increases, the consistency between the battery cells 1 will further deteriorate.

[0068] For example, when the weights of the positive and negative electrodes during coating are closer to the average value, the capacity of the battery cell 1 is closer to the average value, assuming it is 100 Ah; then if the weights of the positive and negative electrodes during coating are closer to the upper limit of the weight value, the capacity of the battery cell 1 will increase, for example, the capacity of the battery cell 1 is 102 Ah at this time; if the weights of the positive and negative electrodes during coating are closer to the lower limit, the capacity of the battery cell 1 is smaller at this time, for example, the capacity of the battery cell 1 is 98 Ah at this time. When the above three battery cells 1 are randomly installed in the same battery device 100a, since the battery cells 1 are connected in series and the charging current value remains unchanged in the constant current charging mode, assuming it is 100 A for all; for the battery cell 1 with a capacity of 102 Ah, the charging rate < 1C at this time; for the battery cell 1 with a capacity of 98 Ah, the charging rate > 1C at this time, and the charging rates of the two are different. The battery with a larger charging rate ages faster, so as time goes by, the consistency of the battery cores deteriorates.

[0069] In this embodiment, taking the charging process as an example, when the battery cell 1 is severely aged, the resistance value of the shunt component 21 is decreased to shunt more current through the branch where the shunt component 21 is located, thereby reducing the current flowing through the battery cell 1 and decreasing the charging current; when the battery cell 1 is in an excellent state, the resistance value of the shunt component 21 is increased, thereby reducing the current flowing through the branch where the shunt component 21 is located and increasing the current flowing through the branch where the battery cell 1 is located, realizing differential charging to improve the consistency of the charging rates among multiple battery cells 1.

[0070] Through the above method, the shunt component 21 can be made to be in parallel with the battery cell 1, and thus the shunt component 21 can be used to shunt the current flowing through the battery cell 1; further, the resistance value of the shunt component 21 is adjustable, and the shunt effect can be adjusted by adjusting the resistance value of the shunt component 21, that is, the magnitude of the current flowing through the corresponding battery cell 1 can be adjusted; during the charge and discharge process, this design can realize adjusting the resistance value of the shunt component according to the self-state of the battery cell 1, realizing adjusting the current flowing through this battery cell 1, and realizing differential charging. Therefore, the consistency of the charge and discharge rates among multiple battery cells 1 in the battery device 100a can be improved, and further the consistency among multiple battery cells 1 in the battery device 100a can be improved, and the service life of the battery device 100a can be increased.

[0071] In some embodiments, the battery device 100a includes multiple battery cells 1 arranged along the first direction x.

[0072] Through the above method, multiple battery cells 1 can be arranged using a simple arrangement structure to increase the capacity of the battery device 100a.

[0073] In some embodiments, the battery device 100a includes multiple connecting members, and the connecting members can connect adjacent battery cells 1 in series.

[0074] In some embodiments, as Figures 6 to 8 shown, Figure 6 is a schematic side view structure of a part of the fifth embodiment of the battery device of the present application, Figure 7 is a schematic side view structure of a part of the sixth embodiment of the battery device of the present application, Figure 8 is a schematic side view structure of a part of the seventh embodiment of the battery device of the present application. The battery cell 1 has two first end faces 13 spaced apart along the second direction y, and the positive electrode terminal and the negative electrode terminal are located on the first end face 13; the second direction y is perpendicular to the first direction x.

[0075] In the above manner, the electrode terminals 11 (positive electrode terminal and negative electrode terminal) can be arranged in a direction perpendicular to the arrangement direction of the battery cells 1, which can reduce the interference of the arrangement of multiple battery cells 1 on the electrode terminals 11, reduce the size of the battery device 100a in the first direction x, and since the electrode terminals 11 are used for connecting the battery cells 1 to the outside, this arrangement can reduce the structural complexity and facilitate the connection of the electrode terminals 11 to the outside.

[0076] In some embodiments, as Figure 13 shown, Figure 13 FIG. is an exploded structural schematic diagram of an embodiment of a variable resistor of the present application. The shunt component 21 includes a variable resistor 22 connected in series between the positive electrode terminal and the negative electrode terminal.

[0077] The variable resistor 22 refers to a resistor with an adjustable resistance value.

[0078] In the above manner, the resistance value of the shunt component 21 can be adjusted by using the variable resistor 22, the shunt current can be flexibly controlled, the number of fixed resistors in the circuit can be reduced, and the assembly complexity can be lowered.

[0079] In other embodiments, the shunt component 21 includes a plurality of switch components and a plurality of fixed resistors. During the charging and discharging process of the battery device 100a, the resistance value of the shunt component 21 can be adjusted by turning the switch components on and off, thereby adjusting the magnitude of the current flowing through the battery cell 1.

[0080] In some embodiments, as Figure 9 shown, Figure 9 FIG. is a side view structural schematic diagram of a part of the structure of the eighth embodiment of the battery device of the present application. The battery device 100a further includes a cooling mechanism 41, and at least a part of the shunt component 21 is disposed on the side surface of the cooling mechanism 41.

[0081] In an application scenario, the cooling mechanism 41 includes a water-cooled plate, and at least a part of the shunt component 21 is close to the side surface of the water-cooled plate to achieve direct contact with the water-cooled plate.

[0082] In the above manner, by disposing the shunt component 21 on the side surface of the cooling mechanism 41, the shunt component 21 can be disposed close to the cooling mechanism 41, so that the cooling mechanism 41 can be used to cool the shunt component 21, thereby improving the use safety.

[0083] In some embodiments, as Figure 9As shown, the cooling mechanism 41 is disposed between two adjacent battery cells 1 along the first direction x; the battery cell 1 has two first end faces 13 spaced apart along the second direction y, and the positive electrode terminal and the negative electrode terminal are located on the first end face 13. The cooling mechanism 41 has two second end faces 42 spaced apart along the second direction y, and the shunt assembly 21 is disposed at least on the second end face 42 of the cooling mechanism 41; wherein, the first direction x is perpendicular to the second direction y.

[0084] Among them, the battery device 100a includes a plurality of battery cells 1 and a plurality of cooling mechanisms 41; the plurality of battery cells 1 are arranged along the first direction x; the cooling mechanism 41 is disposed between two adjacent battery cells 1 along the first direction x, which means that a cooling mechanism 41 is provided between every two adjacent battery cells 1. For example, when the battery device 100a includes two battery cells 1, the battery device 100a includes at least one cooling mechanism 41 disposed between the two battery cells 1; again, for example, when the battery device 100a includes three battery cells 1, the battery device 100a includes at least two cooling mechanisms 41 disposed between two adjacent battery cells 1, and cooling mechanisms 41 are provided on both sides of the middle battery cell 1, and battery cells 1 are provided on both sides of at least two cooling mechanisms 41.

[0085] For example, the cooling mechanism 41 includes a water-cooled plate, and a water-cooled plate is provided between every two adjacent battery cells 1; in some application scenarios, a plurality of water-cooled plates can be connected through structures such as water-cooled pipes.

[0086] It should be noted that the battery cell 1 can be provided with a plurality of end faces. Among them, the positive electrode terminal and the negative electrode terminal are located on two end faces spaced apart along the second direction y, and these two end faces can be defined as the first end face 13. For example, when the battery cells 1 are only arranged along the first direction x, the positive electrode terminal is provided on one of the two first end faces 13 spaced apart along the second direction y, and the negative electrode terminal is provided on one of the two first end faces 13 spaced apart along the second direction y. The positive electrode terminal and the negative electrode terminal can be provided on the same first end face 13 or on different first end faces 13.

[0087] For example Figure 4 、 Figure 6 As shown, Figure 4 is an exploded structural schematic diagram of a part of the structure of the third embodiment of the battery device of the present application, Figure 6A schematic side view of a partial structure of the fifth embodiment of the battery device of the present application. In some embodiments, the battery cell 1 is a cuboid, and a plurality of battery cells 1 are arranged only along the first direction x; the battery cell 1 includes six end faces; among them, a pair of end faces are arranged at intervals in the first direction x, a pair of end faces are arranged at intervals in the second direction y, and a pair of end faces are arranged at intervals in the third direction z, and the first direction x, the second direction y, and the third direction z are perpendicular to each other pairwise; among them, Figure 4 An embodiment is shown in which the positive electrode terminal and the negative electrode terminal can be arranged on different first end faces 13. Figure 6 An embodiment is shown in which the positive electrode terminal and the negative electrode terminal can be arranged on the same first end face 13.

[0088] Among them, the two first end faces 13 arranged at intervals along the second direction y can also be both parallel to the first direction x.

[0089] Among them, the direction in which the two first end faces 13 for arranging the positive electrode terminal and the negative electrode terminal are arranged at intervals is perpendicular to the arrangement direction of the plurality of battery cells 1, which can reduce the interference of the arrangement of the plurality of battery cells 1 on their respective positive electrode terminals and negative electrode terminals, facilitate the connection of the positive electrode terminal and the negative electrode terminal to the outside, and realize the output of electric energy to the outside or the reception of electric energy input from the outside.

[0090] Among them, the cooling mechanism 41 also has two second end faces 42 along the second direction y, for example, the two second end faces 42 are both parallel to the first direction x.

[0091] Among them, the shunt component 21 is at least arranged on the second end face 42 of the cooling mechanism 41, which can not only improve the temperature reduction effect of the cooling mechanism 41 on the shunt component 21, but also reduce the interference of the arrangement of the shunt component 21 on the arrangement of the battery cells 1, and can reduce the size of the battery device 100a in the first direction x.

[0092] By the above method, arranging the cooling mechanism 41 between adjacent battery cells 1 along the first direction x can improve the temperature reduction effect on the battery cells 1; the positive electrode terminal and the negative electrode terminal are located on the first end face 13, which can make the positive electrode terminal and the negative electrode terminal and the main body part of the battery cell 1 be arranged along the second direction y, can optimize the layout, and reduce the size of the battery device 100a in the first direction x; the shunt component 21 is at least arranged on the second end face 42 of the cooling mechanism 41, which can make the shunt component 21 and the battery cells 1 be reasonably distributed around the cooling mechanism 41, so that the cooling mechanism 41 can not only directly cool the battery cells 1, but also directly cool the shunt component 21, and improve the overall space utilization rate and the miniaturization of the battery device 100a.

[0093] In some embodiments, at least one of the first end face 13 and the second end face 42 is perpendicular to the second direction y, which can further optimize the overall structure and facilitate the arrangement of the positive electrode terminal, the negative electrode terminal, and the shunt component 21.

[0094] In some embodiments, such as Figure 2 , Figure 5 shown, Figure 2 is an exploded structural schematic diagram of a part of the first embodiment of the battery device of the present application. Figure 5 is a top structural schematic diagram of a part of the fourth embodiment of the battery device of the present application. The battery device 100a includes a plurality of battery cells 1, and the plurality of battery cells 1 are arranged along the first direction x and the third direction z. The second direction y is perpendicular to the first direction x and the third direction z, and the first direction x, the third direction z, and the second direction y are perpendicular to each other in pairs. The electrode terminal 11 is disposed on a first end face 13 of the battery cell 1 arranged along the second direction y.

[0095] By the above method, the battery cells 1 can be arranged in two directions in a plane perpendicular to the second direction y, improving the space utilization rate of the battery device; the electrode terminal 11 is disposed on a first end face 13 of the battery cell 1 arranged along the second direction y, which can reduce the interference of the arrangement of the battery cells 1 on the electrode terminal 11 and can reduce the overall size of the battery device 100a in the arrangement direction of the battery cells 1.

[0096] In some embodiments, such as Figure 9 shown, Figure 9 is a side structural schematic diagram of a part of the eighth embodiment of the battery device of the present application. At least one second end face 42 is recessed toward another second end face 42 with respect to the first end face 13 arranged on the same side, so as to form a first installation groove 401 on at least one second end face 42, and at least a part of the shunt component 21 is disposed in the first installation groove 401.

[0097] Among them, one second end face 42 and another second end face 42 are two second end faces 42 spaced apart along the second direction y by a certain cooling mechanism 41. For example, the cooling mechanism 41 is a cube with six end faces, and two end faces spaced apart and opposite along the second direction y are used as the second end faces 42, and a first installation groove 401 is formed on at least one second end face 42.

[0098] It should be noted that a plurality of shunt components 21 can be arranged in the first installation groove 401. For example, when the cooling mechanism 41 and the battery cells 1 are arranged along the first direction x, and battery cells 1 are provided on both sides of the cooling mechanism 41, the shunt components 21 corresponding to the battery cells 1 on both sides can be at least partially arranged in the first installation groove 401 of the cooling mechanism 41.

[0099] Among them, there are various ways to form the first installation groove 401. For example, the height of the cooling mechanism 41 along the second direction y is lower than that of the battery cell 1, and thus the first installation groove 401 is formed on one of its second end faces 42. For example, as Figure 9 shown, setting the other second end face 42 of the cooling mechanism 41 to be flush with the first end face 13 provided on the same side of the battery cell 1 can make the height of the above-mentioned one second end face 42 in the second direction y lower than the first end face 13 on the same side, and thus the first installation groove 401 can be formed. For another example, both second end faces 42 of the cooling mechanism 41 are recessed toward the other second end face 42 relative to the first end face 13 provided on the same side, and thus two first installation grooves 401 can be formed. The flow dividing component 21 can be arranged in both first installation grooves 401. For another example, multiple components of the flow dividing component 21 can be respectively arranged in the two first installation grooves 401, and these two first installation grooves 401 can be arranged on different cooling mechanisms 41 or on the same cooling mechanism 41.

[0100] In an application scenario, part of the flow dividing component 21 is arranged in the first installation groove 401, and part extends to the first end face 13 which is arranged on the same side as and adjacent to the first installation groove 401. Since the cooling mechanism 41 and the battery cell 1 are arranged along the first direction x, it can be determined that the first end face 13 and the second end face 42 are arranged along the first direction x. Therefore, in this way, the size of the flow dividing component 21 in the parallel plane of the first direction x can be increased, which is beneficial to reducing the size of the flow dividing component 21 in the second direction y, and thus is beneficial to improving the overall space utilization rate.

[0101] Through the above method, the installation space formed by the first installation groove 401 can be used to arrange the flow dividing component 21, improving the space utilization rate and being beneficial to the miniaturization of the battery device 100a.

[0102] In some embodiments, as Figures 6 to 8 shown, Figure 6 is a schematic side view structure of a part of the structure of the fifth embodiment of the battery device of the present application, Figure 7 is a schematic side view structure of a part of the structure of the sixth embodiment of the battery device of the present application, Figure 8 is a schematic side view structure of a part of the structure of the seventh embodiment of the battery device of the present application. The battery cell 1 has two first end faces 13 arranged at intervals along the second direction y, and at least one of the positive electrode terminal and the negative electrode terminal protrudes from the corresponding first end face 13 to form a second installation groove (not marked in the figure) on the first end face 13 where at least one of the positive electrode terminal and the negative electrode terminal is provided, and the flow dividing component 21 is at least partially located in at least one second installation groove.

[0103] For example, the positive electrode terminal is disposed on one of the two first end faces 13 spaced apart along the second direction y, and the negative electrode terminal is disposed on one of the two first end faces 13 spaced apart along the second direction y; the positive electrode terminal and the negative electrode terminal may be disposed on the same first end face 13 or on different first end faces 13. In an application scenario, a plurality of battery cells 1 are arranged along the first direction x, and the second direction y is perpendicular to the first direction x.

[0104] For example, referring to Figure 6 , on one battery cell 1, the positive electrode terminal and the negative electrode terminal are disposed on the same first end face 13, and the positive electrode terminal and the negative electrode terminal protrude from the first end face 13. A part of the first end face 13 between the positive electrode terminal and the negative electrode terminal forms the bottom of the second mounting groove. The side wall of the positive electrode terminal close to the bottom of the groove and the side wall of the negative electrode terminal close to the bottom of the groove both serve as the side walls of the second mounting groove. The shunt assembly 21 is disposed on the first end face 13 and between the positive electrode terminal and the negative electrode terminal, that is, inside the second mounting groove; for another example, taking the positive electrode terminal as an example, the positive electrode terminal is separately disposed on a first end face 13 and protrudes from the first end face 13, then the non-protruding part of the first end face 13 forms the bottom of the second mounting groove, and the side wall of the positive electrode terminal close to the bottom of the groove serves as the side wall of the second mounting groove; for another example, the positive electrode terminal and the negative electrode terminal are respectively disposed on the two first end faces 13 of the battery cell 1, and the positive electrode terminal and the negative electrode terminal respectively protrude from the corresponding first end face 13. Therefore, second mounting grooves can be formed on both first end faces 13. The shunt assembly 21 can be disposed on one of the second mounting grooves, or the shunt assembly 21 can be disposed on both second mounting grooves; for another example, multiple components of the shunt assembly 21 can be respectively disposed in two second mounting grooves, and these two second mounting grooves can be disposed on different battery cells 1 or on the same battery cell 1.

[0105] It should be noted that the shunt assembly 21 disposed on the second mounting groove of a certain battery cell 1 can be the shunt assembly 21 connected thereto, or can be the shunt assembly 21 corresponding to the battery cell 1 adjacent to the battery cell 1.

[0106] By the above method, the second mounting groove can be formed on the first end face 13 by using the positive electrode terminal or the negative electrode terminal. Disposing the shunt assembly 21 in the second mounting groove can realize the positioning function of the shunt assembly 21, and can simplify the electrical connection structure between the shunt assembly 21 and the positive electrode terminal and the negative electrode terminal, reducing redundant wiring; and the above setting can make full use of the space around the battery cell 1 to dispose the shunt assembly 21, which can improve the structural compactness of the battery device 100a and achieve miniaturization.

[0107] In some embodiments, a part of the flow splitting component 21 is disposed in the first mounting groove of the cooling mechanism 41, and a part of it is disposed in the second mounting groove which is disposed on the same side as and adjacent to the first mounting groove, which is beneficial to reducing the size of the flow splitting component 21 in the second direction y, and can utilize the first mounting groove and the second mounting groove to improve the positioning and protection of the flow splitting component 21.

[0108] In some embodiments, as Figure 6 shown, Figure 6 FIG. is a schematic side view of a partial structure of the fifth embodiment of the battery device of the present application. The flow splitting component 21 is located on the first end face 13 of the battery cell 1 where at least one of the positive electrode terminal and the negative electrode terminal is provided, and one end face of the flow splitting component 21 facing away from the battery cell 1 is lower than or flush with the outer end face of the electrode terminal 11 disposed on the same side. The electrode terminal 11 includes at least one of the positive electrode terminal and the negative electrode terminal.

[0109] Among them, the flow splitting component 21 is located on the first end face 13 of the battery cell 1 where at least one of the positive electrode terminal and the negative electrode terminal is provided, which means that the flow splitting component 21 is located on the first end face 13 of the battery cell 1, and the positive electrode terminal, the negative electrode terminal or both the positive electrode terminal and the negative electrode terminal are provided on the first end face 13.

[0110] Among them, one end face of the flow splitting component 21 facing away from the battery cell 1 is lower than or flush with the outer end face of the electrode terminal 11 disposed on the same side. For example, in the vertical plane of the second direction y, one end face of the flow splitting component 21 facing away from the battery cell 1 is flush with the electrode terminal 11 disposed on the same side; or for another example, the electrode terminal 11 disposed on the same side protrudes along the second direction y from the corresponding flow splitting component 21.

[0111] By the above method, the flow splitting component 21 can be disposed on the first end face 13 of the battery cell 1 where the electrode terminal 11 is provided, the space on the first end face 13 can be shared by the flow splitting component 21 and the electrode terminal 11, and the size of the battery cell 1 in the second direction y can be reduced; further, by setting one end face of the flow splitting component 21 facing away from the battery cell 1 to be lower than or flush with the outer end face of the electrode terminal 11 disposed on the same side, the size of the battery cell 1 in the second direction y can be reduced by reducing the height of the flow splitting component 21 in the second direction y, the compactness of the overall structure can be improved, the miniaturization of the battery device 100a can be improved, and the influence of external extrusion on the flow splitting component 21 can be reduced.

[0112] In some embodiments, as Figure 7 , Figure 8 shown, Figure 7 FIG. is a schematic side view of a partial structure of the sixth embodiment of the battery device of the present application. Figure 8A schematic side view of a partial structure of the seventh embodiment of the battery device of the present application. The shunt component 21 is located on the first end face 13 of the battery cell 1 where at least one of the positive electrode terminal and the negative electrode terminal is provided. The explosion-proof valve 12 is also provided on the first end face 13. The projection of the shunt component 21 on the first end face 13 is spaced apart from at least one of the positive electrode terminal and the negative electrode terminal and the explosion-proof valve 12 on the same first end face 13.

[0113] Among them, the battery cell 1 forms a first end face 13. The shunt component 21 is located on the first end face 13 where at least one of the positive electrode terminal and the negative electrode terminal is provided, which means that the shunt component 21 is located on the first end face 13 of the battery cell 1, and the positive electrode terminal or the negative electrode terminal, or both the positive electrode terminal and the negative electrode terminal are provided on the first end face 13.

[0114] Among them, the explosion-proof valve 12 is also provided on the first end face 13, which means that the explosion-proof valve 12 is also provided on the first end face 13 where the shunt component 21 is provided.

[0115] Among them, the projection of the shunt component 21 on the first end face 13 is spaced apart from at least one of the positive electrode terminal and the negative electrode terminal and the explosion-proof valve 12 on the same first end face 13, which means that on the first end face 13 where the shunt component 21 is provided, the shunt component 21 is spaced apart from the electrode terminal 11 and the explosion-proof valve 12 on the first end face 13, which can reduce the interference among the shunt component 21, the electrode terminal 11, and the explosion-proof valve 12. Among them, the positive and negative poles or the number of the electrode terminals 11 are not limited, and it refers to the electrode terminal 11 provided on the same end face as the shunt component 21.

[0116] By the above method, the shunt component 21 is provided on the first end face 13 of the battery cell 1 where the electrode terminal 11 (such as the positive electrode terminal or the negative electrode terminal) is provided, which can realize the sharing of the space on the first end face 13 between the shunt component 21 and the electrode terminal 11, and can reduce the size of the battery cell 1 in the direction perpendicular to the first end face 13. The explosion-proof valve 12 is provided on the first end face 13 of the battery cell 1, and the projection of the shunt component 21 on the first end face 13 is spaced apart from the electrode terminal 11 and the explosion-proof valve 12 on the first end face 13, which can reduce the interference among the shunt component 21, the explosion-proof valve 12, and the electrode terminal 11, and improve the reliability and safety of the battery device 100a.

[0117] In other embodiments, the relative positional relationship between the explosion-proof valve 12 and the electrode terminals 11 is not limited. For example, the positive electrode terminal and the negative electrode terminal are arranged on the same first end face 13, and the explosion-proof valve 12 is arranged on another first end face 13 opposite thereto. For another example, the explosion-proof valve 12 is arranged on an end face adjacent to the end face where the electrode terminals 11 are located, where the electrode terminals 11 include at least one of the positive electrode terminal and the negative electrode terminal.

[0118] In some embodiments, as Figure 9 shown, Figure 9 is a schematic side view of a partial structure of the eighth embodiment of the battery device of the present application. The positive electrode terminal and the negative electrode terminal are located on the same first end face 13 of the battery cell 1.

[0119] For example, the battery cell 1 has two first end faces 13 spaced apart along the second direction y; when the battery cell 1 is a cuboid or a cuboid-like shape, the battery cell 1 has at least six end faces, where two end faces spaced apart along the second direction y can be used as the first end faces 13 for arranging the electrode terminals 11.

[0120] By the above method, the space on the same first end face 13 can be shared by the positive electrode terminal and the negative electrode terminal, the size of the battery cell 1 in the second direction y can be reduced, and the structural compactness of the battery device 100a can be improved.

[0121] In some embodiments, as Figure 7 、 Figure 8 shown, Figure 7 is a schematic side view of a partial structure of the sixth embodiment of the battery device of the present application, Figure 8 is a schematic side view of a partial structure of the seventh embodiment of the battery device of the present application. Along the third direction z, the explosion-proof valve 12 is located between the positive electrode terminal and the negative electrode terminal, and the shunt component 21 is located between the positive electrode terminal and the explosion-proof valve 12, or the shunt component 21 is located between the negative electrode terminal and the explosion-proof valve 12; the third direction z is the arrangement direction of the positive electrode terminal and the negative electrode terminal.

[0122] Among them, the explosion-proof valve 12 is arranged between the positive electrode terminal and the negative electrode terminal, which can monitor the pressure change in real time, trigger pressure relief at the initial stage of gas accumulation, and avoid excessive pressure accumulation; and this arrangement can prevent the explosion-proof valve 12 from occupying additional volume.

[0123] For example, both the positive electrode terminal and the negative electrode terminal are arranged on the same first end face 13 of the battery cell 1 and arranged along the third direction z. The shunt component 21 and the explosion-proof valve 12 are arranged between the positive electrode terminal and the negative electrode terminal. In the third direction z, the explosion-proof valve 12 divides the area between the positive electrode terminal and the negative electrode terminal into two parts connected by a wire. One part is between the explosion-proof valve 12 and the positive electrode terminal, and the other part is between the explosion-proof valve 12 and the negative electrode terminal.

[0124] For another example, when the shunt component 21 is located between the positive electrode terminal and the explosion-proof valve 12, one end close to the positive electrode terminal can be directly electrically connected to the positive electrode terminal, and the end facing away from the positive electrode terminal can be electrically connected to the negative electrode terminal through a wire; for another example, when the shunt component 21 is located between the negative electrode terminal and the explosion-proof valve 12, one end close to the negative electrode terminal can be directly electrically connected to the negative electrode terminal, and the end facing away from the negative electrode terminal can be electrically connected to the positive electrode terminal through a wire.

[0125] In the above manner, with the explosion-proof valve 12 located between the positive electrode terminal and the negative electrode terminal and the shunt component 21 located between the positive electrode terminal and the explosion-proof valve 12, it is possible to arrange the positive electrode terminal, the shunt component 21, the explosion-proof valve 12, and the negative electrode terminal along the third direction z, or to arrange the negative electrode terminal, the shunt component 21, the explosion-proof valve 12, and the positive electrode terminal along the third direction z. Therefore, the size of the battery device 100a in the direction perpendicular to the third direction z can be reduced, and the compactness of the overall structure can be improved.

[0126] In some embodiments, the third direction z is perpendicular to the second direction y and the first direction x pairwise. That is, the arrangement direction of the positive electrode terminal and the negative electrode terminal on the first end face 13, the arrangement direction of the two first end faces 13 on the battery cell 1 where the electrode terminals 11 can be arranged, and the arrangement direction of the plurality of battery cells 1 are in a pairwise perpendicular relationship.

[0127] In the above manner, the interference of the arrangement of the plurality of battery cells 1 on the explosion-proof valve 12 and the electrode terminals 11 of each battery cell 1 can be reduced, and the complexity of wire routing can be reduced.

[0128] In other embodiments, the shunt component 21 may include two parts. One part is arranged between the positive electrode terminal and the explosion-proof valve 12, and the other part is located between the negative electrode terminal and the explosion-proof valve 12.

[0129] In other embodiments, the shunt component 21 corresponding to the battery cell 1 is arranged on the first end face 13 of the battery cell 1 and is located between the positive electrode terminal and the explosion-proof valve 12; at the same time, the shunt component 21 corresponding to another battery cell 1 adjacent to the battery cell 1 can also be arranged on the first end face 13 of the battery cell 1 and is located between the negative electrode terminal of the battery cell 1 and the explosion-proof valve 12.

[0130] In some embodiments, the shunt component 21 is connected in series between the positive electrode terminal and the negative electrode terminal through a conducting wire.

[0131] Among them, the conducting wire has high flexibility, can be freely bent and cut, and can adapt to different battery layouts.

[0132] By the above method, connecting the shunt component 21 with the positive electrode terminal and the negative electrode terminal through the conducting wire can improve the flexibility of the connection, reduce the position limitation on the shunt component 21, the positive electrode terminal and the negative electrode terminal, and reduce the cost.

[0133] In some embodiments, at least one of the positive electrode terminal and the negative electrode terminal is also electrically connected to a bus bar 31, and the shunt component 21 is electrically connected to the corresponding positive electrode terminal or negative electrode terminal through the bus bar 31.

[0134] In an application scenario, the bus bar 31 includes a bus bar sheet. The bus bar sheet has a large surface area, firm connection, can reduce the contact resistance, reduce the local heating condition, and has good aging resistance, which can improve the service life of the battery device 100a.

[0135] By the above method, connecting the shunt component 21 with the positive electrode terminal or the negative electrode terminal through the bus bar 31 can reduce the contact resistance, reduce the local heating condition, and improve the service life of the battery device 100a.

[0136] In some embodiments, as Figure 13 shown, Figure 13 is an exploded structural schematic diagram of an embodiment of a variable resistor of the present application. The variable resistor 22 is provided with a first fixed end 23, a second fixed end 24 and a moving end 25. One of the first fixed end 23 and the moving end 25 is electrically connected to the positive electrode terminal, and the other of the first fixed end 23 and the moving end 25 is electrically connected to the negative electrode terminal. The second fixed end 24 is set to be suspended.

[0137] By the above method, the resistance value of the variable resistor 22 can be adjusted by adjusting the moving end 25. The structure is simple and the cost can be reduced; the suspended setting can achieve a high-impedance state and reduce the power consumption.

[0138] In some embodiments, the second fixed end 24 can also be grounded. The grounded setting can provide a stable reference point and reduce the risk of leakage.

[0139] In some embodiments, the positive electrode terminals and the negative electrode terminals of multiple battery cells 1 can also be connected in series through a conducting wire or a bus bar 31.

[0140] In some embodiments, as Figure 10 , Figure 11 ,Figure 12 As shown, Figure 10 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present application. Figure 11 for Figure 10 The exploded structure diagram of the battery cell shown in FIG. Figure 12 Schematic diagram of the exploded structure of another embodiment of the battery cell of the present application, the battery cell 1 comprises: a housing 110 forming a receiving cavity with an opening, an electrode assembly 500 disposed in the receiving cavity and an end cap 120 covering the opening, the end cap 120 being provided with a positive electrode terminal and a negative electrode terminal; Figure 13 As shown, Figure 13 This is a schematic diagram of the exploded structure of an embodiment of a variable resistor of the present application. The variable resistor 22 is provided with a first fixed end 23, a second fixed end 24 and a moving end 25. One of the first fixed end 23 and the moving end 25 is electrically connected to the positive electrode terminal, the other of the first fixed end 23 and the moving end 25 is electrically connected to the negative electrode terminal, and the second fixed end 24 is suspended or connected to the shell.

[0141] The shell 110 and the end cap 120 together constitute the outer shell 100 of the battery cell 1, and the outer shell 100 is used to encapsulate the electrode assembly 500 and the electrolyte and other components. The outer shell 100 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

[0142] The end cap 120 refers to a component that covers the opening of the housing 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 120 can be adapted to the shape of the housing 110 to match the housing 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 120 is not easily deformed when squeezed and collided, so that the battery cell 1 can have a higher structural strength and the safety performance can also be improved.

[0143] In some embodiments, the end cap 120 may also be provided with a pressure relief mechanism, such as an explosion-proof valve 12, for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The material of the end cap 120 may also be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component may also be provided on the inner side of the end cap 120, and the insulating component may be used to isolate the electrical connection components in the housing 110 from the end cap 120 to reduce the risk of short circuit. Exemplarily, the insulating component may be plastic, rubber, etc.

[0144] The housing 110 is a component for cooperating with the end cap 120 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 500, the electrolyte, and other components. The housing 110 and the end cap 120 can be separate components. For example, an opening is provided on the housing 110, and the end cap 120 can cover the opening of the housing 110 to form the internal environment of the battery cell 1. Additionally, the end cap 120 and the housing 110 can also be integrated. For example, the end cap 120 and the housing 110 can first form a common connection surface before other components are inserted into the housing, and when it is necessary to encapsulate the interior of the housing 110, the end cap 120 is then made to cover the housing 110. The housing 110 can be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 110 can be determined according to the specific shape and size of the electrode assembly 500. The material of the housing 110 can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0145] The electrode assembly 500 is the component in the battery cell 1 where the electrochemical reaction occurs. The housing 110 can contain one or more electrode assemblies 500.

[0146] In some embodiments, the electrode assembly 500 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0147] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and positive electrode active material provided on at least one surface of the positive electrode current collector.

[0148] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0149] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0150] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (which may also be abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (which may also be abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (which may also be abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (which may also be abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (which may also be abbreviated as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2), and their modified compounds, etc.

[0151] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0152] As an example, the negative electrode current collector may be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, titanium, etc. may be used. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0153] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0154] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0155] As an example, the negative electrode active material can be the negative electrode active material for the battery cell 1 well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0156] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0157] In some embodiments, the electrode assembly 500 further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0158] In some embodiments, the separator is a separator membrane. The present application does not have a particular limitation on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0159] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0160] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously plays the role of transporting ions and isolating the positive and negative electrodes.

[0161] In some embodiments, the battery cell 1 further includes an electrolyte, and the electrolyte plays the role of conducting ions between the positive and negative electrodes. The present application does not have a specific limitation on the type of the electrolyte, and can be selected according to requirements. The electrolyte can be liquid, gel-like or solid.

[0162] Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0163] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0164] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0165] Among them, the gel electrolyte includes a polymer as the skeletal network of the electrolyte, combined with an ionic liquid-lithium salt.

[0166] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0167] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0168] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0169] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0170] In some embodiments, the electrode assembly 500 has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0171] In some embodiments, the electrode assembly 500 is provided with tabs 501, which can conduct current out of the electrode assembly 500. The tabs 501 include a positive tab and a negative tab. The positive tab and the negative tab can be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging process of the battery 100a, the positive active material and the negative active material react with the electrolyte.

[0172] Among them, as Figure 11 shown, Figure 11 is Figure 10 a schematic diagram of the explosion structure of a battery cell. The electrode terminal 11 on the end cap 120 is connected to the tab 501. Among them, the positive electrode terminal is connected to the positive tab, and the negative electrode terminal is connected to the negative tab. The electrode assembly 500 can output electrical energy to the outside or receive electrical energy input from the outside through the positive electrode terminal and the negative electrode terminal.

[0173] Among them, the first fixed end 23 and the moving end 25 of the variable resistor 22 can be respectively connected to the positive electrode terminal and the negative electrode terminal. For example, the first fixed end 23 is connected to the positive electrode terminal, and the moving end 25 is connected to the negative electrode terminal, or vice versa. The moving end 25 can move between the first fixed end 23 and the second fixed end 24 to adjust the resistance value of the variable resistor 22.

[0174] Among them, the second fixed end 24 can be set to be suspended or connected to the housing 110. Among them, it is not limited whether the housing 110 is grounded. When the second fixed end 24 is grounded through the housing 110, the risk of electric leakage can be reduced, and redundant wiring can be reduced.

[0175] Through the above method, the housing 110 and the end cap 120 can be used to form the internal environment of the battery cell 1, so as to protect the internal electrode assembly 500, and improve the structural strength and safety of the battery cell 1; the variable resistor 22 is provided with a first fixed end 23, a second fixed end 24 and a moving end 25, and the resistance value of the variable resistor 22 can be adjusted by adjusting the moving end 25, and the structure is simple.

[0176] In some embodiments, as Figure 3 , Figure 4 shown, Figure 3 is a schematic exploded view of part of the structure of the second embodiment of the battery device of the present application, Figure 4 is a schematic exploded view of part of the structure of the third embodiment of the battery device of the present application. The positive electrode terminal and the negative electrode terminal are located on two first end faces 13 of the battery cell 1 that are oppositely arranged along the second direction y. The battery device 100a at least includes a plurality of battery cells 1, and a shunt assembly 21 is provided between adjacent battery cells 1 (not shown in the figure); the second direction y is perpendicular to the arrangement direction of the plurality of battery cells 1.

[0177] For example, the battery cell 1 can be a blade battery pack or a square shell battery pack; for another example, in some embodiments, the battery cell 1 is a cylindrical battery pack, and two first end faces 13 are formed along the second direction y, and the positive electrode terminal and the negative electrode terminal are located on the two first end faces 13 of the battery cell 1; the shunt component 21 is disposed in the gap between the plurality of battery cells 1 and is in the same arrangement plane as the plurality of battery cells 1; wherein, the second direction y is perpendicular to the arrangement plane.

[0178] Wherein, the arrangement directions of the positive electrode terminal and the negative electrode terminal and the arrangement direction of the plurality of battery cells 1 are perpendicular to each other, and this arrangement can reduce the interference of the arrangement between adjacent battery cells 1 on the positive electrode terminal and the negative electrode terminal; further, the shunt component 21 is disposed between adjacent battery cells 1, which is convenient for connecting with the positive electrode terminal and the negative electrode terminal at both ends of the battery cell 1, can reduce the complexity of the wire arrangement, and is convenient for realizing the electrical connection between the positive electrode terminal, the negative electrode terminal and the outside.

[0179] For another example, in an application scenario, as Figure 4 shown, Figure 4 is a partial exploded structural schematic diagram of the third embodiment of the battery device of the present application. The battery device includes a box body 10a and a battery cell 1, and the battery cell 1 is accommodated in the box body 10a; the box body 10a includes a first part 11a and a second part 12a, the first part 11a and the second part 12a are covered with each other, and the first part 11a and the second part 12a jointly define an accommodation space for accommodating the battery cell 1. The second part 12a can be a hollow structure with one end open, and the first part 11a can be a plate-like structure. The first part 11a covers the open side of the second part 12a so that the first part 11a and the second part 12a jointly define an accommodation space. The battery cell 1 includes three pairs of end faces that are opposite to each other and spaced apart. One pair of end faces is spaced apart along the first direction x, one pair of end faces is spaced apart along the second direction y and serves as the first end face 13 for arranging the electrode terminals 11, and one pair of end faces is spaced apart along the third direction z. The plurality of battery cells 1 are arranged along the first direction x, and the first direction x, the second direction y, and the third direction z are perpendicular to each other pairwise. Wherein, the arrangement directions of the first part 11a and the second part 12a of the box body 10a are parallel to the third direction z. Therefore, in the above manner, the positive electrode terminal and the negative electrode terminal can be respectively arranged on the two first end faces 13 arranged along the second direction y, and the extrusion and interference of the first part 11a and the second part 12a of the box body 10a on the electrode terminals 11 during covering can be reduced. Wherein, the battery cell 1 can be a blade battery pack.

[0180] In the above manner, the positive electrode terminal and the negative electrode terminal can be oppositely arranged on the two first end faces 13 of the battery cell 1 to form a symmetrical layout, which is convenient for forming the electrode assembly 500 by using a mature winding process or lamination process inside the battery cell 1, can maximize the use of space and reduce material waste; and being oppositely arranged on the two first end faces 13 of the battery cell 1, the current directly reaches the negative electrode terminal from the positive electrode terminal through the electrode plate and then through the electrolyte, forming the shortest path, which can significantly reduce the internal resistance of the battery and can reduce the risk of local overheating caused by uneven current distribution; further, by arranging the shunt component 21 between adjacent battery cells 1, the size of the battery device 100a in the second direction y can be reduced, and the structural layout can be optimized.

[0181] In some application scenarios, the cooling mechanism 41 can be arranged between adjacent battery cells 1, and can also be arranged on one side of the first part 11a of the box body 10a close to the accommodation space, or on one side of the second part 12a close to the accommodation space.

[0182] In other embodiments, the shunt component 21 can also be arranged on the end face of the battery cell 1 where the electrode terminal 11 is arranged.

[0183] In some embodiments, the battery device 100a further includes a sampling component (not shown in the figure), the sampling component is connected to the shunt component 21, and is configured to obtain the operating parameters of the battery cell 1 and adjust its resistance value based on the control parameters corresponding to the operating parameters.

[0184] In an application scenario, the battery device 100a includes a battery management system, or the electrical device includes a battery management system connected to the sampling component of the battery device 100a; the sampling component is connected to the battery management system, the sampling component is simultaneously connected to the battery cell 1, and can obtain the operating parameters of the battery cell 1; the battery management system can generate control parameters according to the operating parameters of the battery cell 1, and the sampling component can adjust the resistance value of the shunt component 21 based on the control parameters. For example, when the shunt component 21 includes a variable resistor 22, its moving end 25 can be controlled to move to achieve the adjustment of its resistance value; for example, the sampling component includes a sampling part and a driving part, the driving part is connected to the moving end 25 and is used to control the movement of the moving end 25; the sampling part is used for sampling. Another example is that when the shunt component 21 includes a plurality of switch components and a fixed resistor, the sampling component can control the on-off of different switch components to achieve the adjustment of the resistance value of the shunt component 21.

[0185] In some application scenarios, the sampling component includes a control chip, a sampling part, and a driving part, the sampling part can obtain the operating parameters of the battery cell 1; the sampling part and the driving part are connected to the control chip, and the control chip can generate control parameters according to the operating parameters of the battery cell 1 and can control the driving part to adjust the resistance value of the shunt component 21.

[0186] Among them, the operating parameters of the battery cell 1 include capacity, current value, voltage value, temperature parameter, etc.

[0187] Through the above method, the operating parameters of the battery cell 1 can be obtained by using the sampling component, and the sampling component can generate corresponding control parameters based on the operating parameters to adjust the resistance value of the shunt component 21, so as to adjust the current flowing through the battery cell 1, and further improve the consistency among the battery cells 1 in the battery device 100a.

[0188] In some embodiments, such as Figure 2 , Figure 6 shown, Figure 2 is an exploded structural schematic diagram of a part of the first embodiment of the battery device of the present application. Figure 6 is a side view structural schematic diagram of a part of the fifth embodiment of the battery device of the present application. The battery cell 1 includes a square shell battery pack. Among them, the battery device 100a includes a box body 10a and the battery cell 1, and the battery cell 1 is accommodated in the box body 10a; the box body 10a includes a first part 11a and a second part 12a, the first part 11a and the second part 12a cover each other, and the first part 11a and the second part 12a jointly define an accommodation space for accommodating the battery cell 1. The second part 12a can be a hollow structure with one end open, and the first part 11a can be a hollow structure with one side open. The open side of the first part 11a covers the open side of the second part 12a, so that the first part 11a and the second part 12a jointly define the accommodation space. The battery cell 1 includes three pairs of end faces that are opposite to each other and spaced apart. One pair of end faces is spaced apart along the first direction x, one pair of end faces is spaced apart along the second direction y and serves as the first end face 13 for arranging the electrode terminals 11, and one pair of end faces is spaced apart along the third direction z. A plurality of battery cells 1 are arranged along the first direction x, and the first direction x, the second direction y, and the third direction z are perpendicular to each other pairwise. Among them, the arrangement directions of the first part 11a and the second part 12a of the box body 10a are parallel to the second direction y. Among them, the positive electrode terminal and the negative electrode terminal are arranged on the same first end face 13 arranged along the second direction y, and the first end face 13 is close to the first part 11a. Among them, as Figures 10 to 12 shown, Figure 10 is a structural schematic diagram of an embodiment of the battery cell of the present application. Figure 11 is Figure 10 the exploded structural schematic diagram of the battery cell shown. Figure 12Explosion structure schematic diagram of another embodiment of the battery cell of the present application. The square shell battery pack refers to a component formed by arranging a wound electrode assembly 500 with a cross-section similar to an ellipse in the accommodation space formed by a square housing 110 and an end cover 120. The positive electrode terminal and the negative electrode terminal are arranged on the first end face 13 formed by the end cover 120. Among them, pole ears 501 are provided at both ends of the electrode assembly 500, and the pole ears 501 include a positive pole ear and a negative pole ear; as Figure 12 shown, Figure 12 Explosion structure schematic diagram of another embodiment of the battery cell of the present application. The battery cell 1 further includes a current collector 502. One end of the current collector 502 is connected to the pole ear 501, and one end is connected to the electrode terminal 11; among them, the current collector 502 includes a positive current collector and a negative current collector; one end of the positive current collector is connected to the positive pole ear, and one end extends to the side of the electrode assembly 500 close to the end cover 120 and is connected to the positive electrode terminal on the end cover 120; one end of the negative current collector is connected to the negative pole ear, and one end extends to the side of the electrode assembly 500 close to the end cover 120 and is connected to the negative electrode terminal on the end cover 120.

[0189] In the above manner, the positive electrode terminal and the negative electrode terminal can be arranged on the first end face 13 close to the first part 11a, which is convenient for setting the working states of multiple battery cells in the box body 10a before the first part 11a and the second part 12a are covered, improving the operation convenience.

[0190] Among them, as Figures 6 to 8 shown, Figure 6 Side view structure schematic diagram of a part of the fifth embodiment of the battery device of the present application, Figure 7 Side view structure schematic diagram of a part of the sixth embodiment of the battery device of the present application, Figure 8 Side view structure schematic diagram of a part of the seventh embodiment of the battery device of the present application. The shunt assembly 21 is arranged on the first end face 13 where the positive electrode terminal and the negative electrode terminal of the battery cell 1 are arranged, realizing sharing the space of the first end face 13 with the positive electrode terminal and the negative electrode terminal, reducing the risk of being squeezed, and reducing the size of the battery device 100a in the second direction y.

[0191] Among them, as Figures 7 to 8 shown, Figure 7 Side view structure schematic diagram of a part of the sixth embodiment of the battery device of the present application, Figure 8Schematic side view of a partial structure of the seventh embodiment of the battery device of the present application. The battery cell 1 includes an explosion-proof valve 12 disposed between the positive electrode terminal and the negative electrode terminal. For example, the explosion-proof valve 12 is disposed on the end cap 120, and the positive electrode terminal, the explosion-proof valve 12, and the negative electrode terminal are spaced apart along the third direction z. The explosion-proof valve 12 divides the region between the positive electrode terminal and the negative electrode terminal into two parts, one part is between the explosion-proof valve 12 and the positive electrode terminal, and the other part is between the explosion-proof valve 12 and the negative electrode terminal. The shunt assembly 21 can be disposed between the explosion-proof valve 12 and the positive electrode terminal, or can be disposed between the explosion-proof valve 12 and the negative electrode terminal, or can be divided into two parts connected by a wire; as Figure 7 shown, the shunt assembly 21 is divided into two parts connected by a wire, one part is disposed between the explosion-proof valve 12 and the positive electrode terminal, and the other part is disposed between the explosion-proof valve 12 and the negative electrode terminal. This can enable the shunt assembly 21 to avoid the explosion-proof valve 12 and reduce its interference with the explosion-proof valve 12.

[0192] Wherein, the third direction z is parallel to the long side direction of the cross-section of the battery cell 1 in the vertical plane of the second direction y. This setting can reserve sufficient space for disposing the positive electrode terminal and the negative electrode terminal.

[0193] Wherein, as Figure 9 shown, Figure 9 Schematic side view of a partial structure of the eighth embodiment of the battery device of the present application. The cooling mechanism 41 is disposed between adjacent battery cells 1.

[0194] In some embodiments, as Figure 4 shown, Figure 4Schematic exploded view of a partial structure of the third embodiment of the battery device of the present application. The battery cell 1 includes a blade battery pack; the battery device 100a includes a box body 10a and the battery cell 1, and the battery cell 1 is accommodated in the box body 10a; the box body 10a includes a first part 11a and a second part 12a, the first part 11a and the second part 12a cover each other, and the first part 11a and the second part 12a jointly define an accommodation space for accommodating the battery cell 1. The second part 12a may be a hollow structure with one end open, and the first part 11a may be a plate-like structure. The first part 11a covers the open side of the second part 12a so that the first part 11a and the second part 12a jointly define the accommodation space. The battery cell 1 includes three pairs of end faces that are opposite to each other and spaced apart. One pair of end faces is spaced apart along the first direction x, one pair of end faces is spaced apart along the second direction y and serves as the first end face 13 for arranging the electrode terminals 11, and one pair of end faces is spaced apart along the third direction z. A plurality of battery cells 1 are arranged along the first direction x, and the first direction x, the second direction y, and the third direction z are perpendicular to each other pairwise. Among them, the arrangement directions of the first part 11a and the second part 12a of the box body 10a are parallel to the third direction z. Among them, the positive electrode terminal and the negative electrode terminal are respectively arranged on two first end faces 13 arranged along the second direction y.

[0195] In the above manner, it is possible to reduce the extrusion and interference of the electrode terminals 11 when the first part 11a and the second part 12a of the box body 10a are covered.

[0196] Among them, the shunt component 21 is arranged between adjacent battery cells 1.

[0197] Among them, the cooling mechanism 41 is arranged between adjacent battery cells 1.

[0198] In some embodiments, as Figure 3 , Figure 14 shown, Figure 3 Schematic exploded view of a partial structure of the second embodiment of the battery device of the present application, Figure 14 Schematic structure view of another embodiment of the battery cell of the present application. The battery cell 1 includes a cylindrical battery pack; the battery device 100a includes a box body 10a and the battery cell 1, and the battery cell 1 is accommodated in the box body 10a; the box body 10a includes a first part 11a and a second part 12a, the first part 11a and the second part 12a cover each other, and the first part 11a and the second part 12a jointly define an accommodation space for accommodating the battery cell 1. The second part 12a may be a hollow structure with one end open, and the first part 11a may be a plate-like structure. The first part 11a covers the open side of the second part 12a so that the first part 11a and the second part 12a jointly define the accommodation space. As Figure 14As shown, the battery cell 1 includes two end faces that are opposite and spaced apart. The two end faces are spaced apart along the second direction y and serve as the first end face 13 for arranging the electrode terminals 11. Among them, the arrangement directions of the first part 11a and the second part 12a of the box body 10a are parallel to the second direction y. Among them, the electrode terminals 11 are arranged on the first end face 13. Specifically, the positive electrode terminal and the negative electrode terminal are jointly arranged on the first end face 13 close to the first part 11a. Among them, multiple battery cells 1 are arranged in a plane perpendicular to the second direction y.

[0199] By the above method, the positive electrode terminal and the negative electrode terminal can be arranged on the first end face 13 close to the first part 11a, which is convenient for setting the working states of multiple battery cells 1 in the box body 10a before the first part 11a and the second part 12a are covered, improving the operation convenience.

[0200] Among them, the shunt component 21 and the cooling mechanism 41 are jointly arranged in a plane perpendicular to the second direction y with multiple battery cells 1, and the shunt component 21 and the cooling mechanism 41 are arranged in the gaps between adjacent battery cells 1 to improve the space utilization rate.

[0201] Among them, multiple battery cells 1 can be arranged along the first direction x and the third direction z perpendicular to the second direction y, and the electrode terminals 11 are arranged on the first end face 13 of the battery cell 1 arranged along the second direction y. By the above method, the battery cells 1 can be arranged in two directions in a plane perpendicular to the second direction y, improving the space utilization rate of the battery device; arranging the electrode terminals 11 on the first end face 13 of the battery cell 1 arranged along the second direction y can reduce the cross-sectional area of the battery device 100a in the plane perpendicular to the second direction y, that is, can reduce the overall size of the battery device 100a in the arrangement direction of the battery cells 1.

[0202] In some embodiments, as Figure 15 shown Figure 15A schematic side view of a partial structure of the ninth embodiment of the battery device of the present application. The battery cell 1 includes a One-Stop battery. The battery device 100a includes a box body 10a and the battery cell 1, and the battery cell 1 is accommodated in the box body 10a; the box body 10a includes a first part 11a and a second part 12a, the first part 11a and the second part 12a cover each other, and the first part 11a and the second part 12a jointly define an accommodation space for accommodating the battery cell 1. The second part 12a may be a hollow structure with one end open, and the first part 11a may be a plate-like structure. The first part 11a covers the opening side of the second part 12a so that the first part 11a and the second part 12a jointly define an accommodation space. Among them, a plurality of battery cells 1 are arranged along the first direction x; the positive electrode terminal and the negative electrode terminal are arranged at both ends of the battery cell 1 along the second direction y; the first part 11a and the second part 12a are arranged along the third direction z.

[0203] In some embodiments, such as Figure 1 shown, Figure 1 A schematic structural view of an embodiment of the vehicle of the present application. The electrical device includes the battery device 100a described in any of the above embodiments.

[0204] With such an arrangement, the shunt component 21 can be connected in parallel with the battery cell 1, and thus the shunt component 21 can be used to shunt the current flowing through the battery cell 1; further, the resistance value of the shunt component 21 is adjustable, and the shunt effect can be adjusted by adjusting the resistance value of the shunt component 21, that is, the magnitude of the current flowing through the corresponding battery cell 1 can be adjusted; during the charging and discharging process, this design can adjust the current flowing through the battery cell 1 according to the self-state of the battery cell 1. Therefore, the consistency of the charge and discharge rates between multiple battery cells 1 in the battery device 100a can be improved, and further the consistency between multiple battery cells 1 in the battery device 100a can be improved, and the service life of the battery device 100a can be extended.

[0205] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: The battery device comprises: A battery cell having a positive electrode terminal and a negative electrode terminal; The shunt component is electrically connected between the positive electrode terminal and the negative electrode terminal and is configured to have an adjustable resistance value so as to adjust the magnitude of the current flowing through the battery cell.

2. The battery device according to claim 1, characterized in that: The shunt component includes a variable resistor connected in series between the positive electrode terminal and the negative electrode terminal.

3. The battery device according to claim 1, characterized in that: The battery device further includes a cooling mechanism, and the shunt component is at least partially disposed on a side of the cooling mechanism.

4. The battery device according to claim 3, characterized in that: The cooling mechanism is disposed between two adjacent battery cells along a first direction; The battery cell has two first end surfaces spaced apart along a second direction, the positive electrode terminal and the negative electrode terminal are located on the first end surface, the cooling mechanism has two second end surfaces spaced apart along the second direction, and the shunt assembly is at least disposed on the second end surface of the cooling mechanism; The first direction is perpendicular to the second direction.

5. The battery device according to claim 4, characterized in that: At least one of the second end faces is recessed toward another of the second end faces relative to the first end face arranged on the same side, so as to form a first installation groove on the at least one of the second end faces, and the diverter assembly is at least partially arranged in the first installation groove.

6. The battery device according to claim 1, characterized in that: The battery cell has two first end faces spaced apart along a second direction, and at least one of the positive electrode terminal and the negative electrode terminal protrudes from the corresponding first end face to form a second mounting groove on the first end face where at least one of the positive electrode terminal and the negative electrode terminal is located, and the shunt component is at least partially located in at least one of the second mounting grooves.

7. The battery device according to claim 1, characterized in that: The shunt component is located on the first end surface of the battery cell where at least one of the positive electrode terminal and the negative electrode terminal is located, and an end surface of the shunt component facing away from the battery cell is lower than or flush with the outer end surface of the electrode terminal arranged on the same side, and the electrode terminal includes at least one of the positive electrode terminal and the negative electrode terminal.

8. The battery device according to claim 1, characterized in that: The shunt assembly is located on a first end surface of the battery cell provided with at least one of the positive electrode terminal and the negative electrode terminal, and the first end surface is also provided with an explosion-proof valve; The projection of the shunt component on the first end surface is spaced apart from at least one of the positive electrode terminal and the negative electrode terminal on the same first end surface and the explosion-proof valve.

9. The battery device according to claim 8, characterized in that: The positive electrode terminal and the negative electrode terminal are located on the same first end surface of the battery cell.

10. The battery device according to claim 9, characterized in that: Along the third direction, the explosion-proof valve is located between the positive electrode terminal and the negative electrode terminal, the shunt component is located between the positive electrode terminal and the explosion-proof valve, or the shunt component is located between the negative electrode terminal and the explosion-proof valve; The third direction is an arrangement direction of the positive electrode terminal and the negative electrode terminal.

11. The battery device according to claim 1, characterized in that: The shunt component is connected in series between the positive electrode terminal and the negative electrode terminal through a conductive wire.

12. The battery device according to claim 1, characterized in that: At least one of the positive electrode terminal and the negative electrode terminal is also electrically connected to a busbar, and the shunt component is electrically connected to the corresponding positive electrode terminal or the negative electrode terminal through the busbar.

13. The battery device according to claim 2, characterized in that: The battery cell comprises: a shell forming a receiving cavity with an opening, an electrode assembly arranged in the receiving cavity, and an end cap covering the opening, wherein the end cap is provided with the positive electrode terminal and the negative electrode terminal; The variable resistor is provided with a first fixed end, a second fixed end and a moving end, one of the first fixed end and the moving end is electrically connected to the positive electrode terminal, the other of the first fixed end and the moving end is electrically connected to the negative electrode terminal, and the second fixed end is suspended or connected to the shell.

14. The battery device according to claim 1, characterized in that: The positive electrode terminal and the negative electrode terminal are located at two first end surfaces of the battery cell that are opposite to each other along the second direction, the battery device comprises at least a plurality of the battery cells, and the current shunt assembly is disposed between adjacent battery cells; The second direction is arranged perpendicularly to an arrangement direction of the plurality of battery cells.

15. The battery device according to any one of claims 1 to 14, characterized in that: The battery device further includes a sampling component, which is connected to the current shunt component and configured to obtain operating parameters of the battery cell and adjust its resistance value based on control parameters corresponding to the operating parameters.

16. An electrical equipment, characterized in that: A battery device comprising any one of claims 1 to 15.

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