Battery module, battery, electric device, and battery discharge control method

Abstract

The present application discloses a battery module, a battery, an electric device, and a battery discharge control method. The battery module comprises: at least two battery cells, each battery cell comprising a casing having an accommodating cavity, power supply modules accommodated in the accommodating cavity, and a functional layer, the functional layer being electrically connected to the power supply modules; and a control module used for acquiring the current state parameter of each battery cell, and on the basis of the deviation between the current state parameters of the battery cells among the at least two battery cells, determining whether to perform heating discharge balancing on the power supply modules by means of the functional layer in the battery cell.

Description

Battery module, battery, power-consuming device, and battery discharge control method

[0001] Cross-references

[0002] This application claims priority to invention patent application 2023115807188, filed on November 24, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of vehicle technology, and in particular to a battery module, a battery, an electrical device, and a battery discharge control method. Background Art

[0004] New energy batteries are widely used due to their high energy density and long cycle life. However, when multiple battery cells are connected in series or parallel, new energy batteries often have problems such as rapid capacity decay and short life. This is caused by inconsistency between battery cells.

[0005] Currently, the balancing technology of the Battery Management System (BMS) primarily targets the state of charge (SOC) level within battery cells. Ideally, balancing technology balances the SOC of each battery cell. There are two implementation options for balancing: active balancing and passive balancing. Both actively and passively eliminate inconsistencies within battery cells to a certain extent. Active balancing requires additional components, which is very cost-inefficient. The system also has high complexity, making it difficult to promote. Passive balancing requires the use of resistors to dissipate energy, but this energy dissipation generates significant heat, making it prone to burning out or even short-circuiting after prolonged, high-current discharge.

[0006] Summary of the Invention

[0007] The main technical problem solved by the present application is to provide a battery module, a battery, an electrical device and a battery discharge control method, which can improve the heat dissipation problem when the battery cell dissipates energy and improve the battery safety.

[0008] In the first aspect, the present application provides a battery module, which includes: at least two battery cells, the battery cell includes a shell having a accommodating cavity, a power supply module accommodated in the accommodating cavity, and a functional layer; the functional layer is electrically connected to the power supply module; a control module is used to obtain the current state parameters of each battery cell, and based on the deviation of the current state parameters between the battery cells in at least two battery cells, determine whether to heat and discharge the power supply module through the functional layer in the battery cell.

[0009] In the technical solution of the embodiment of the present application, the current state parameters of the battery cells are obtained through the control module, and based on the deviation of the current state parameters between the battery cells, it is determined to heat and discharge the power supply module through the functional layer within the battery cell to balance the power supply module. By dissipating the electric energy stored in the power supply module, consistency between the battery cells is achieved, thereby improving the safety of the battery cells.

[0010] In some embodiments, the outer shell includes a shell having an opening and an end cover covering the opening, the shell and / or the end cover are made of metal, and the functional layer is attached to the inner wall surface of the shell and / or the end cover made of metal; wherein the shell includes two large surfaces arranged opposite to each other, and the functional layer is at least attached to the inner surface of the large surfaces.

[0011] In the technical solution of the embodiment of the present application, the metal material has excellent thermal conductivity. The functional layer is in contact with the metal, which facilitates the functional layer to quickly transfer the generated heat to the metal, increase the heat dissipation area, and make the functional layer at least attached to the inner surface of the large surface, further improving the heat dissipation efficiency of the functional layer and improving the safety of the battery cell.

[0012] In some embodiments, the current state parameters include the current detection voltage and / or the current remaining power; the control module is used to determine the minimum remaining power based on the current remaining power of each battery cell, and control the functional layer of the battery cell corresponding to the current remaining power greater than the minimum remaining power to heat and discharge the power supply module for equalization; or; the control module is used to determine the minimum voltage based on the current detection voltage of each battery cell, and control the functional layer of the battery cell corresponding to the current detection voltage greater than the minimum voltage to heat and discharge the power supply module for equalization.

[0013] In the technical solution of the embodiment of the present application, the minimum remaining power or minimum voltage is selected based on the current detection voltage or the current remaining power of the battery cell, and the battery cell that needs discharge balancing is selected. The control module controls the functional layer in the battery cell that needs discharge balancing to heat and discharge the power supply module, and achieves consistency between the battery cells by dissipating the electric energy stored in the power supply module, thereby improving the safety of the battery cells.

[0014] In some embodiments, the functional layer is a conductive heat dissipation film; wherein the conductive heat dissipation film includes a metal layer and an insulating heat dissipation layer coated on the outer surface of the metal layer, the thickness of the conductive heat dissipation film ranges from 0.8 mm to 1.2 mm, and the maximum surface power density of the conductive heat dissipation film is not less than 31 W / cm 2 And / or the insulation resistance of the conductive heat dissipation film is not less than 300mΩ.

[0015] In the technical solution of the embodiment of the present application, the functional layer is a conductive heat dissipation film, which can increase the heat conduction and heat dissipation area, improve the heat dissipation efficiency, and conduct the heat generated by the functional layer itself to the outside world. The conductive heat dissipation film is small in size and can adapt to a smaller installation space. It can stably convert electrical energy into thermal energy and has excellent heat dissipation function, which can effectively solve the heat dissipation problem of the battery cell and improve the safety of the battery cell.

[0016] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0017] Since the control module in the battery obtains the current state parameters of the battery cells, it determines to heat and discharge the power supply module through the functional layer within the battery cells according to the deviation of the current state parameters between the battery cells, and achieves consistency between the battery cells by dissipating the electric energy stored in the power supply module, thereby improving the safety of the battery cells.

[0018] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0019] Since the control module in the electrical device obtains the current state parameters of the battery cells, it determines to heat and discharge the power supply module through the functional layer within the battery cells according to the deviation of the current state parameters between the battery cells, and achieves consistency between the battery cells by dissipating the electric energy stored in the power supply module, thereby improving the safety of the battery cells.

[0020] Fourthly, the present application provides a battery discharge control method, which is applied in a battery module as described above. The battery discharge control method includes: collecting current state parameters of each battery cell; generating control instructions corresponding to each battery cell based on the current state parameters of each battery cell in at least two battery cells; and sending corresponding control instructions to the battery cell to control the functional layer in the battery cell to heat and discharge the power supply module.

[0021] In the technical solution of the embodiment of the present application, the control instructions corresponding to each battery cell are determined based on the current state parameters of each battery cell in the battery module. Different current state parameters correspond to different control instructions. The corresponding battery cell is controlled to discharge according to the control instructions of the battery cell, which is beneficial to improving the inconsistency of the battery cells in the battery and improving the safety of the battery cells.

[0022] In some embodiments, the current state parameters include the current detection voltage and / or the current remaining power; the control instructions include a target threshold, an operating signal and a temperature threshold; based on the current state parameters of each battery cell in at least two battery cells, a control instruction corresponding to each battery cell is generated, including: determining the minimum voltage based on the current detection voltage of each battery cell, and using the minimum voltage as the target threshold; using the battery cell corresponding to the current detection voltage greater than the minimum voltage as the battery to be discharged; the operating signal of the battery to be discharged is a discharge signal; or; determining the minimum remaining power based on the current remaining power of each battery cell, and using the minimum remaining power as the target threshold; using the battery cell corresponding to the current remaining power greater than the minimum remaining power as the battery to be discharged; the operating signal of the battery to be discharged is a discharge signal; sending corresponding control instructions to the battery cell to control the functional layer in the battery cell to perform heating and discharge balancing on the power supply module, including: sending corresponding control instructions to the battery to be discharged to control the functional layer in the battery cell to perform heating and discharge balancing on the power supply module.

[0023] In the technical solution of the embodiment of the present application, by determining the minimum voltage or the minimum remaining power as the target voltage, the current detection voltage of each battery cell is compared with the minimum voltage, or the current remaining power of each battery cell is compared with the minimum remaining power, the battery cells that need to be discharged are screened out, and the corresponding control instructions are sent only to the batteries that need to be discharged, so that the battery is discharged according to the control instructions, which reduces the amount of calculation, simplifies the process, and can also improve the inconsistency of each battery cell in the battery.

[0024] In the fifth aspect, the present application provides a battery discharge control method, which is applied to a battery module as described above. The battery discharge control method includes: the battery cell receives a control instruction, and based on the control instruction, controls the functional layer in the battery cell to convert the electrical energy stored in the power supply module into thermal energy to perform discharge balancing on the battery cell.

[0025] In the technical solution of the embodiment of the present application, each battery cell controls the functional layer according to the received control instructions to convert electrical energy into thermal energy and transfer the thermal energy to the outside world, which not only improves the inconsistency of the battery cells in the battery, but also solves the heat dissipation problem of the battery cells and improves the safety of the battery cells.

[0026] In some embodiments, the control instruction includes a target threshold, an operating signal and a temperature threshold; based on the control instruction, the functional layer in the battery cell is controlled to convert the electrical energy stored in the power supply module into thermal energy to balance the discharge of the battery cell, including: in response to the operating signal received by the battery cell being a discharge signal, the functional layer is controlled to convert the electrical energy stored in the power supply module into thermal energy; the state parameters and temperature of the battery cell in the discharge stage are detected respectively to obtain the current state parameters and the detected temperature; based on the current state parameters, the target threshold and the detected temperature, and the temperature threshold, it is determined whether to continue to control the battery cell for discharge balancing; wherein, based on the current state parameters, the target threshold and the detected temperature, and the temperature threshold, it is determined whether to continue to control the battery cell for discharge balancing, including: in response to the detected temperature of the battery cell exceeding the temperature threshold, the battery cell is controlled to stop discharging and cool down; in response to the detected temperature not exceeding the temperature threshold, the battery cell is controlled to continue discharging; in response to the current state parameters of the battery cell meeting the target threshold, the battery cell is controlled to stop discharging.

[0027] In the technical solution of the embodiment of the present application, when the battery cell receives a discharge signal, the functional layer can be controlled to convert the electrical energy stored in the power supply module into thermal energy. By real-time monitoring the temperature of the battery cell, it is determined whether to continue to control the battery cell to discharge, thereby reducing the risk of the battery cell safety being affected by excessive temperature. By real-time monitoring the voltage of the battery cell, it is determined whether to continue to control the battery cell to discharge, thereby reducing the risk of over-discharge of the battery cell. When the temperature of the battery cell exceeds the temperature threshold, the battery cell is controlled to stop discharging, thereby reducing the risk of the battery cell safety being affected by excessive temperature. When the voltage of the battery cell exceeds the target voltage, the battery cell is controlled to stop discharging, thereby reducing the risk of over-discharge of the battery cell.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0031] FIG2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0032] FIG3 is a schematic structural diagram of a battery module according to some embodiments of the present application;

[0033] FIG4 is a schematic diagram of the frame structure of a battery module according to some embodiments of the present application;

[0034] FIG5 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0035] FIG6 is a schematic diagram of a framework of a battery cell according to an embodiment of the present application;

[0036] FIG7 is a flow chart of a battery discharge control method provided in one embodiment of the present application;

[0037] FIG8 is a flow chart of a battery discharge control method provided in another embodiment of the present application;

[0038] FIG9 is a schematic diagram of a framework of a terminal according to an embodiment of the present application;

[0039] FIG10 is a schematic diagram of a framework of an embodiment of a computer-readable storage medium provided in this application. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0043] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0045] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0048] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0049] The battery referred to in the embodiments of this application refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. Batteries generally include a housing for enclosing one or more battery cells. The housing can reduce the risk of liquids or other foreign matter affecting the charging or discharging of the battery cells.

[0050] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab connected to the positive current collector portion. The positive current collector portion is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, which is coated on the surface of the current collector. The negative current collector includes a negative current collecting portion and a negative electrode tab connected to the negative current collecting portion. The negative current collecting portion is coated with the negative active material layer, while the negative tab is not coated with the negative active material layer. The negative current collector can be made of copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, for example. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0051] To maximize battery energy utilization, it's necessary to improve the inconsistency between individual cells within the battery. The battery in this embodiment is a lithium-ion battery. This inconsistency not only reduces the actual discharge capacity of the battery pack, impacting the device's power output and battery life, but can also, in severe cases, lead to thermal runaway, resulting in failure.

[0052] Specifically, inconsistencies in individual battery cells can affect the lifespan of lithium-ion batteries and reduce the performance of grouped batteries. Grouped battery cell inconsistency refers to differences in parameters such as capacity, voltage, internal resistance, and self-discharge rate. This is caused by differences in the battery pack's structure, operating conditions, operating environment, and battery management.

[0053] Both active and passive balancing aim to eliminate cell inconsistencies to a certain extent. Active balancing requires more components, which is very cost-effective. It also increases system complexity, making it difficult to promote. Passive balancing uses resistors to dissipate energy, but this generates significant heat, making it prone to burnout or even short circuits after prolonged, high-current discharge.

[0054] In order to improve the heat dissipation problem of battery cells, the present application sets a functional layer in the battery cell, replaces the resistor in the original battery cell with the functional layer, and electrically connects the functional layer to the power supply module, so that the functional layer converts the electrical energy stored in the power supply module into heat energy, which makes it easier for the functional layer to dissipate the electrical energy stored in the power supply module, and reduces the voltage of the battery cell by consuming electrical energy, thereby achieving consistency between the battery cells; and the functional layer can transfer and conduct the generated heat energy to the outside world, thereby solving the heat dissipation problem of the battery cell. It has a simple structure, low cost, wide application, and improves the safety of the battery cell.

[0055] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0056] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including boxes and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0057] Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle according to some embodiments of the present application.

[0058] The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000.

[0059] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Please refer to FIG. 2 , which is a schematic diagram of the exploded structure of batteries according to some embodiments of the present application.

[0062] The battery 100 includes a housing 10 and a battery cell 21, with the battery cell 21 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 21, and the housing 10 can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 21. The second portion 12 can be a hollow structure with one end open, and the first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0063] Please refer to FIG. 3 , which is a schematic structural diagram of a battery module according to some embodiments of the present application.

[0064] In the battery 100, there may be multiple battery cells 21, and the multiple battery cells 21 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 21. The multiple battery cells 21 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 20 may be housed within the housing 10. Alternatively, the battery 100 may be configured such that multiple battery cells 21 are first connected in series, in parallel, or in a hybrid connection to form a battery module 20, which is then connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. Specifically, the multiple battery cells 21 may be electrically connected via a busbar to enable parallel, series, or hybrid connection of the multiple battery cells 21 within the battery module 20.

[0065] Each battery cell 21 may be a secondary battery 100 or a primary battery 100 ; it may also be a lithium-sulfur battery 100 , a sodium-ion battery 100 or a magnesium-ion battery 100 , but is not limited thereto.

[0066] Primary batteries are also called "disposable" batteries or primary batteries because once their charge is depleted, they cannot be recharged and must be discarded. Secondary batteries are also called rechargeable batteries, secondary batteries, or storage batteries. Secondary batteries are manufactured using different materials and processes than primary batteries. Their advantage is that they can be reused multiple times after charging, and their output current capacity is higher than most primary batteries. Common secondary battery types include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries offer advantages such as light weight, high capacity (1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and a very low self-discharge rate. Consequently, despite their relatively high price, they are widely used. Lithium-ion batteries are also widely used in pure electric vehicles and hybrid vehicles. While the capacity of lithium-ion batteries used for these applications is relatively low, they offer higher output, higher charging current, and a longer lifespan, albeit at a higher cost.

[0067] In the present application, the battery cell 21 may include a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of the present application are not limited to this. The battery cell 21 may be cylindrical, flat, rectangular, or other shapes, and the embodiments of the present application are not limited to this. The battery cell 21 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited to this. However, for the sake of simplicity, the following embodiments are all described using the square battery cell 21 as an example.

[0068] Please refer to Figures 4, 5 and 6. Figure 4 is a schematic diagram of the frame structure of the battery module of some embodiments of the present application; Figure 5 is a schematic diagram of the decomposed structure of the battery cell of some embodiments of the present application; and Figure 6 is a schematic diagram of the frame of an embodiment of the battery cell provided in the present application.

[0069] The battery 100 includes a battery module 20 . As shown in FIG4 , the battery module 20 includes a control module 22 and at least two battery cells 21 . The control module 22 is communicatively connected to each of the battery cells 21 .

[0070] The battery cell 21 is the smallest unit that makes up the battery 100. As shown in Figure 5, the battery cell 21 includes a housing 211, a power module 212, a functional layer 213, an analyzer 214, and other functional components. The housing 211 has a receiving cavity 211c; the power module 212 is housed in the receiving cavity 211c. The functional layer 213 is electrically connected to the power module 212 via the analyzer 214, converting the electrical energy stored in the power module 212 into heat energy and transferring the heat energy to the outside world.

[0071] The control module 22 is used to obtain the current state parameters of each battery cell 21 and determine whether to perform heating and discharge balancing on the power supply module 212 through the functional layer 213 in the battery cell 21 based on the deviation of the current state parameters between the battery cells 21 in at least two battery cells 21.

[0072] In the technical solution of this embodiment, the current state parameters of the battery cells 21 are obtained through the control module 22. According to the deviation of the current state parameters between the battery cells 21, it is determined that the power supply module 212 is heated and discharged evenly through the functional layer 213 within the battery cell 21. By dissipating the electric energy stored in the power supply module 212, consistency between the battery cells 21 is achieved, thereby improving the safety of the battery cells 21.

[0073] The outer shell 211 comprises a housing 211a and an end cap 211b, which together form a receiving chamber 211c. The housing 211a has an opening, and the end cap 211b fits over the opening of the housing 211a to isolate the internal environment of the battery cell 21 from the external environment. The housing 211a comprises an annular sidewall and a bottom wall that covers a port at one end of the annular sidewall.

[0074] Specifically, the end cap 211b covers the port at the other end of the annular sidewall. Without limitation, the shape of the end cap 211b can be adapted to the shape of the housing 211a to match the housing 211a. Optionally, the end cap 211b can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end cap 211b is less likely to deform when squeezed or collided, allowing the battery cell 21 to have a higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on the end cap 211b. The electrode terminals can be used to electrically connect to the power supply module 212 for outputting or inputting electrical energy to or from the battery cell 21. In some embodiments, the end cap 211b can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The end cap 211b can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may be provided inside the end cap 211b to isolate the electrical connection components in the housing 211a from the end cap 211b to reduce the risk of short circuit.

[0075] Specifically, the housing 211a is a component that cooperates with the end cap 211b to form the internal environment of the battery cell 21. This internal environment can be used to accommodate the power supply module 212, electrolyte, and other components. The housing 211a and the end cap 211b can be separate components. An opening can be provided in the housing 211a, and the end cap 211b is placed over the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 211b and the housing 211a can be integrated. Specifically, the end cap 211b and the housing 211a can form a common connection surface before other components are inserted into the housing. When the interior of the housing 211a needs to be enclosed, the end cap 211b is placed over the housing 211a. The housing 211a can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 211a can be determined based on the specific shape and size of the power supply module 212. The housing 211 a can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0076] The shell 211a and / or the end cap 211b are made of metal, and the functional layer 213 is attached to the inner wall surfaces of the metal shell 211a and / or the end cap 211b. When the outer shell 211 is made of metal, the shell 211a includes two large surfaces arranged opposite each other, and the functional layer 213 is attached to at least the inner surfaces of the large surfaces. The functional layer 213 is attached to at least the inner surfaces of the large surfaces of the shell 211a, further improving the heat dissipation efficiency of the functional layer 213 and the safety of the battery cell 21. When the cross-section of the accommodating cavity 211c of the shell 211a is rectangular, the side walls corresponding to the long sides of the rectangle serve as the large surfaces of the shell 211a, and the side walls corresponding to the short sides of the rectangle serve as the side surfaces of the shell 211a. When the cross-section of the accommodating cavity 211c of the shell 211a is circular, the two opposing curved side walls serve as the large surfaces of the shell 211a.

[0077] In the technical solution of the embodiment of the present application, the metal material has excellent thermal conductivity. The functional layer 213 is in contact with the metal, which facilitates the functional layer 213 to quickly transfer the generated heat to the metal, increase the heat dissipation area, and make the functional layer 213 at least attached to the inner surface of the large surface, further improving the heat dissipation efficiency of the functional layer 213 and improving the safety of the battery cell 21.

[0078] The power supply module 212 is accommodated in the accommodating cavity 211 c . The power supply module 212 is used to store electrical energy and to provide power to other components in the battery cell 21 that are electrically connected thereto.

[0079] The functional layer 213 and the controller 200 are both disposed within the housing cavity 211c. The controller 200 is electrically connected to the power supply module 212 via a wire, allowing the power supply module 212 to supply power to the controller 200. The functional layer 213 is electrically connected to the controller 200 via a wire, allowing the power supply module 212 to supply power to the functional layer 213 via the controller 200. The wire can be a flexible flat cable or a copper wire.

[0080] In one embodiment, the current state parameter includes a current detection voltage. The control module 22 is configured to determine a minimum voltage based on the current detection voltage of each battery cell 21 and control the functional layer 213 of the battery cell 21 corresponding to the current detection voltage greater than the minimum voltage to heat and discharge the power supply module 212.

[0081] In one embodiment, the current state parameter includes the current remaining power. The control module 22 is configured to determine a minimum remaining power based on the current remaining power of each battery cell 21 and control the functional layer 213 of the battery cell 21 corresponding to the current remaining power greater than the minimum remaining power to heat and discharge the power supply module 212 for equalization.

[0082] In the technical solution of the embodiment of the present application, the minimum remaining power or minimum voltage is selected based on the current detection voltage or the current remaining power of the battery cell 21, and the battery cell 21 that needs to be discharged and balanced is selected. The control module 22 controls the functional layer 213 in the battery cell 21 that needs to be discharged and balanced to heat and discharge the power supply module 212, and achieves consistency between the battery cells 21 by dissipating the electric energy stored in the power supply module 212, thereby improving the safety of the battery cell 21.

[0083] In one embodiment, the functional layer 213 is a conductive heat dissipation film. The conductive heat dissipation film includes a metal layer and an insulating heat dissipation layer coated on the outer surface of the metal layer. The material of the insulating heat dissipation layer is polyimide (PI). The conductive heat dissipation film can be in any shape such as a rectangle or a circle. Specifically, the conductive heat dissipation film uses a polyimide film as the outer insulating heat dissipation layer; and uses a metal foil or a metal wire as the metal layer as the inner conductive heating element, which is heat-sealed at high temperature and high pressure. The functional layer 213 is made by coating the metal layer with an insulating heat dissipation layer, and the metal layer is used as the inner conductive heating element to convert the electrical energy of the power supply module 212 electrically connected thereto into thermal energy. The insulating heat dissipation layer has excellent insulation strength and heat dissipation performance, and diffuses the heat energy to the outside, thereby improving the heat dissipation efficiency of the functional layer 213 and improving the safety of the battery cell 21.

[0084] Specifically, the conductive heat dissipation film occupies a small space, and the thickness of the conductive heat dissipation film ranges from 0.8 mm to 1.2 mm. In this embodiment, the thickness of the conductive heat dissipation film can be 0.8 mm, 0.9 mm, 1 mm, 0.9 mm, and 1.2 mm. The conductive heat dissipation film has excellent thermal conductivity and heat dissipation performance, and the maximum surface power density of the conductive heat dissipation film is not less than 31 W / cm 2 Among them, the higher the maximum surface power density, the smaller the area required to achieve a large heat dissipation power, saving the internal space of the battery cell 21. The conductive heat dissipation film has excellent compressive strength, which refers to the maximum voltage that can be withstood between the two lead terminals of the capacitor and the metal shell 211. The conductive heat dissipation film can stably convert electrical energy into thermal energy and has excellent resistance stability. The insulation resistance of the conductive heat dissipation film is not less than 300mΩ.

[0085] The functional layer 213 provided in this embodiment is a conductive heat dissipation film, which can increase the heat conduction and heat dissipation area, improve the heat dissipation efficiency, and can conduct the heat generated by the functional layer 213 itself to the outside world. The conductive heat dissipation film is small in size and can adapt to a smaller installation space. It can stably convert electrical energy into thermal energy and has excellent heat dissipation function, which can effectively solve the heat dissipation problem of the battery cell 21 and improve the safety of the battery cell 21.

[0086] Specifically, analyzer 214 can be a PCB control board. Analyzer 214 is spaced apart from housing 211 and functional layer 213, and is electrically connected to functional layer 213 and power module 212. Analyzer 214 is configured to control functional layer 213 to convert electrical energy stored in power module 212 into thermal energy. Analyzer 214 controls whether to electrically connect functional layer 213 to power module 212 by controlling the on / off connection with functional layer 213, thereby controlling whether electrical energy from power module 212 is converted into thermal energy via functional layer 213.

[0087] The present application can reduce the heat transferred from the functional layer 213 and / or the housing 211 to the analyzer 214 by spacing the analyzer 214 from the housing 211 and the functional layer 213, thereby reducing the risk of damage to the analyzer 214 due to heat; and by electrically connecting the analyzer 214 to the functional layer 213 and the power supply module 212, it is convenient to control the operation of the functional layer 213 through the analyzer 214, thereby realizing controllable operation.

[0088] The shell 211 a and / or the end cover 211 b are made of metal, and the functional layer 213 is attached to the inner wall surface of the shell 211 a and / or the end cover 211 b made of metal.

[0089] In one embodiment, when the outer shell 211 is made of metal, the functional layer 213 is attached to the inner wall surface of the outer shell 211. The outer shell 211 has excellent thermal conductivity. The contact between the functional layer 213 and the outer shell 211 facilitates the rapid transfer of heat generated by the functional layer 213 to the outer shell 211, and then to the air outside the battery cell 21 through the outer shell 211. This increases the area for heat conduction and heat dissipation, further improves the heat dissipation efficiency of the functional layer 213, and enhances the safety of the battery cell 21.

[0090] In one embodiment, when the shell 211 a is made of metal and the end cover 211 b is made of plastic, the functional layer 213 is attached to the inner wall surface of the annular side wall and / or the inner wall surface of the bottom wall.

[0091] In one embodiment, when the shell 211 a is made of plastic and the end cover 211 b is made of metal, the functional layer 213 is attached to the inner wall surface of the end cover 211 b.

[0092] In one embodiment, when the shell 211a and the end cover 211b are both made of metal, the functional layer 213 may be attached to the inner wall surface of the annular side wall, the bottom wall and / or the inner wall surface of the end cover 211b.

[0093] There may be multiple or one functional layer 213. The multiple functional layers 213 may be attached to the same inner wall surface at intervals or to different inner wall surfaces.

[0094] The operating voltage of the battery cell 21 in this embodiment can be arbitrarily selected within the voltage range of 1V to 380V.

[0095] In another embodiment, the battery cell 21 in this embodiment can also be used under low temperature conditions in scenarios where the performance of the battery cell 21 is severely degraded. The functional layer 213 in the battery cell 21 converts the electrical energy stored in the power supply module 212 into thermal energy to heat the battery 100, which can effectively improve the electrochemical performance of the battery 100.

[0096] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery module 20 of any of the above solutions.

[0097] According to some embodiments of the present application, the present application further provides an electric device, comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide power to the electric device.

[0098] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0099] The battery discharge control method provided in this embodiment is applied to the battery module as described above, and the execution subject of this embodiment is a terminal or a server. The battery cell in the battery module can be the battery cell 21 shown in Figures 5 and 6.

[0100] Please refer to FIG. 7 , which is a flow chart of a battery discharge control method provided in an embodiment of the present application.

[0101] S11: Collect the current state parameters of each battery cell.

[0102] S12: Based on the current state parameters of each battery cell in the at least two battery cells, generating a control instruction corresponding to each battery cell.

[0103] S13: Sending corresponding control instructions to the battery cell to control the functional layer in the battery cell to heat and discharge the power supply module in a balanced manner.

[0104] In the technical solution of the embodiment of the present application, the control instructions corresponding to each battery cell are determined based on the current state parameters of each battery cell in the battery module. Different current state parameters correspond to different control instructions. The corresponding battery cell is controlled to discharge according to the control instructions of the battery cell, which is beneficial to improving the inconsistency of the battery cells in the battery and improving the safety of the battery cells.

[0105] In step S2, the current state parameters include the current detection voltage and / or the current remaining power; the control instructions include the target threshold, the working signal and the temperature threshold.

[0106] In one embodiment, a minimum voltage is determined based on the current detection voltage of each battery cell, and the minimum voltage is used as a target threshold; a battery cell corresponding to a current detection voltage greater than the minimum voltage is used as a battery to be discharged; and the working signal of the battery to be discharged is a discharge signal.

[0107] In another embodiment, the minimum remaining power is determined based on the current remaining power of each battery cell, and the minimum remaining power is used as the target threshold; the battery cell corresponding to the current remaining power greater than the minimum remaining power is used as the battery to be discharged; and the working signal of the battery to be discharged is a discharge signal.

[0108] In step S3, a corresponding control instruction is sent to the battery to be discharged to control the battery to be discharged to discharge.

[0109] By determining the minimum voltage or the minimum remaining power as the target voltage, the current detection voltage of each battery cell is compared with the minimum voltage, or the current remaining power of each battery cell is compared with the minimum remaining power, the battery cells that need to be discharged are screened out, and the corresponding control instructions are sent only to the batteries that need to be discharged, so that the battery is discharged according to the control instructions. This reduces the amount of calculation, simplifies the process, and can also improve the inconsistency of each battery cell in the battery.

[0110] The battery discharge control method provided in this embodiment is applied to the battery module described above. The execution subject of this embodiment is a battery cell. The battery module includes at least two battery cells, and the battery cell 21 may be the battery cell 21 shown in Figures 5 and 6. The battery discharge control method specifically includes the following steps.

[0111] Please refer to FIG8 , which is a flow chart of a battery discharge control method provided in another embodiment of the present application.

[0112] S21: The battery cell receives the control instruction and controls the functional layer in the battery cell based on the control instruction to convert the electrical energy stored in the power supply module into thermal energy, so as to perform discharge balancing on the battery cell.

[0113] In this embodiment, each battery cell controls the functional layer to convert electrical energy into heat energy according to the received control instructions, and transfers the heat energy to the outside world, which not only improves the inconsistency of each battery cell in the battery, but also solves the heat dissipation problem of the battery cell and improves the safety of the battery cell.

[0114] In some embodiments, the control instruction includes a target threshold, an operating signal, and a temperature threshold. In response to the operating signal received by the battery cell being a discharge signal, the control function layer converts the electrical energy stored in the power supply module into thermal energy; detects the state parameters and temperature of the battery cell in the discharge phase to obtain the current state parameters and detected temperature; and determines whether to continue controlling the battery cell for discharge balancing based on the current state parameters, the target threshold, the detected temperature, and the temperature threshold.

[0115] When a battery cell receives a discharge signal, it can control the functional layer to convert the electrical energy stored in the power supply module into heat energy. By monitoring the temperature of the battery cell in real time, it can determine whether to continue controlling the battery cell to discharge, thereby reducing the risk of battery cell safety being affected by excessive temperature. By monitoring the voltage of the battery cell in real time, it can determine whether to continue controlling the battery cell to discharge, thereby reducing the risk of over-discharge of the battery cell. Over-discharge occurs when a battery cell continues to discharge after being discharged normally to the cut-off voltage.

[0116] In some embodiments, in response to the detected temperature of the battery cell exceeding a temperature threshold, the battery cell is controlled to stop discharging and to cool; in response to the detected temperature not exceeding the temperature threshold, the battery cell is controlled to continue discharging; in response to the current state parameter of the battery cell meeting the target threshold, the battery cell is controlled to stop discharging.

[0117] When the temperature of a battery cell exceeds the temperature threshold, the battery cell is controlled to stop discharging, reducing the risk of the battery cell safety being affected by excessive temperature. When the voltage of a battery cell exceeds the target voltage, the battery cell is controlled to stop discharging, reducing the risk of over-discharge of the battery cell.

[0118] Please refer to FIG9 , which is a schematic diagram of a framework of an embodiment of a terminal provided in this application.

[0119] The terminal 80 provided in this embodiment includes a memory 81 and a processor 82 coupled to each other. The processor 82 is configured to execute program instructions stored in the memory 81 to implement the steps of any of the above-described battery discharge control method embodiments. In a specific implementation scenario, the terminal 80 may include, but is not limited to, a microcomputer and a server. Furthermore, the terminal 80 may also include, but is not limited to, mobile devices such as laptops and tablet computers.

[0120] Specifically, the processor 82 is used to control itself and the memory 81 to implement the steps of any of the above-mentioned battery discharge control method embodiments. The processor 82 can also be called a CPU (Central Processing Unit). The processor 82 may be an integrated circuit chip with signal processing capabilities. The processor 82 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor. In addition, the processor 82 can be implemented by an integrated circuit chip.

[0121] Please refer to FIG10 , which is a schematic diagram of a framework of an embodiment of a computer-readable storage medium provided in this application.

[0122] The computer-readable storage medium 90 provided in this embodiment stores program instructions 901 that can be executed by a processor. The program instructions 901 are used to implement the steps of any of the above-mentioned battery discharge control method embodiments.

[0123] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments. For the sake of brevity, it will not be repeated here.

[0124] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0125] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation methods described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0126] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0127] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0128] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery module, wherein: The battery module comprises: At least two battery cells, each of which comprises a housing having a receiving cavity, a power supply module received in the receiving cavity, and a functional layer; the functional layer is electrically connected to the power supply module; The control module is used to obtain the current state parameters of each battery cell and determine whether to perform heating and discharge balancing on the power supply module through the functional layer in the battery cell based on the deviation of the current state parameters between the battery cells in the at least two battery cells.

2. The battery module according to claim 1, wherein: The outer shell includes a shell having an opening and an end cover covering the opening, the shell and / or the end cover are made of metal, and the functional layer is attached to the inner wall surface of the shell and / or the end cover made of metal; wherein the shell includes two large surfaces arranged opposite to each other, and the functional layer is at least attached to the inner surface of the large surfaces.

3. The battery module according to claim 1, wherein: The current state parameters include the current detection voltage and / or the current remaining power; The control module is used to determine the minimum remaining power based on the current remaining power of each battery cell, and control the functional layer of the battery cell corresponding to the current remaining power greater than the minimum remaining power to perform heating and discharge balancing on the power supply module; Alternatively, the control module is used to determine a minimum voltage based on a current detection voltage of each of the battery cells, and control a functional layer of the battery cell corresponding to the current detection voltage greater than the minimum voltage to perform heating and discharge balancing on the power supply module.

4. The battery module according to any one of claims 1 to 3, wherein: The functional layer is a conductive heat dissipation film; wherein the conductive heat dissipation film comprises a metal layer and an insulating heat dissipation layer coated on the outer surface of the metal layer, the thickness of the conductive heat dissipation film ranges from 0.8 mm to 1.2 mm, and the maximum surface power density of the conductive heat dissipation film is not less than 31 W / cm 2 And / or the insulation resistance of the conductive heat dissipation film is not less than 300 mΩ.

5. The battery module according to claim 4, wherein: The thickness of the conductive heat dissipation film is 0.8 mm, 0.9 mm, 1 mm, 0.9 mm, and 1.2 mm.

6. The battery module according to claim 4, wherein: The insulating heat dissipation layer is a polyimide film.

7. The battery module according to claim 4, wherein: The metal layer is metal foil or metal wire.

8. The battery module according to claim 1, wherein: The battery cell further includes an analyzer, and the functional layer is electrically connected to the power supply module via the analyzer, and is used to convert the electrical energy stored in the power supply module into thermal energy.

9. The battery module according to claim 8, wherein: The analyzer is spaced apart from the housing and the functional layer; the analyzer is used to control the on-off connection between the analyzer and the functional layer to determine whether the functional layer is electrically connected to the power supply module.

10. A battery, wherein: include: The battery module according to any one of claims 1 to 9.

11. An electrical device, wherein: The electrical device comprises the battery as claimed in claim 10, and the battery is used to provide electrical energy.

12. A battery discharge control method, wherein: The battery discharge control method is applied in the battery module according to any one of claims 1 to 9, and the battery discharge control method comprises: Collecting current state parameters of each battery cell; Based on the current state parameters of each of the at least two battery cells, generating a control instruction corresponding to each of the battery cells; The corresponding control instruction is sent to the battery cell to control the functional layer in the battery cell to heat and discharge the power supply module in a balanced manner.

13. The battery discharge control method according to claim 12, wherein: The current state parameters include the current detection voltage and / or the current remaining power; the control instructions include the target threshold, the working signal and the temperature threshold; The generating, based on the current state parameter of each of the at least two battery cells, a control instruction corresponding to each of the battery cells, comprises: Determine a minimum voltage based on the current detection voltage of each battery cell, and use the minimum voltage as the target threshold; use the battery cell corresponding to the current detection voltage greater than the minimum voltage as a battery to be discharged; the working signal of the battery to be discharged is a discharge signal; or, determine a minimum remaining power based on the current remaining power of each battery cell, and use the minimum remaining power as the target threshold; use the battery cell corresponding to the current remaining power greater than the minimum remaining power as a battery to be discharged; the working signal of the battery to be discharged is a discharge signal; The sending of the corresponding control instruction to the battery cell to control the functional layer in the battery cell to perform heating and discharging balancing on the power supply module includes: The corresponding control instruction is sent to the battery to be discharged, so as to control the functional layer in the battery cell to heat and discharge the power supply module in a balanced manner.

14. A battery discharge control method, wherein: The battery discharge control method is applied to the battery module according to any one of claims 1 to 9, and the battery discharge control method comprises: The battery cell receives a control instruction, and based on the control instruction, controls a functional layer in the battery cell to convert the electrical energy stored in the power supply module into thermal energy, so as to perform discharge balancing on the battery cell.

15. The battery discharge control method according to claim 14, wherein: The control instructions include a target threshold, a working signal and a temperature threshold; The controlling the functional layer in the battery cell to convert the electric energy stored in the power supply module into heat energy based on the control instruction so as to discharge and balance the battery cell includes: In response to the working signal received by the battery cell being a discharge signal, the functional layer is controlled to The electrical energy stored in the power supply module is converted into thermal energy; The state parameters and temperature of the battery cell in the discharge stage are detected respectively to obtain the current state parameters and the detected temperature; Determining whether to continue controlling the battery cells to perform discharge balancing based on the current state parameter, the target threshold, the detected temperature, and the temperature threshold; Wherein, determining whether to continue controlling the battery cell to perform discharge balancing based on the current state parameter, the target threshold, the detected temperature, and the temperature threshold includes: In response to the detected temperature of the battery cell exceeding the temperature threshold, controlling the battery cell to stop discharging and cool down; In response to the detected temperature not exceeding the temperature threshold, the battery cell is controlled to continue discharging; in response to the current state parameter of the battery cell meeting the target threshold, the battery cell is controlled to stop discharging.

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