CN219626796U - A kind of power supply device and energy storage system - Google Patents

Abstract

The application provides a power supply device and an energy storage system. The power supply device includes a casing, a battery unit and a flexible circuit board. Wherein: the housing includes an accommodating cavity, the battery unit is arranged in the accommodating cavity, the housing has a valve port communicating with the accommodating cavity, and the valve port is connected with a valve. The flexible circuit board is arranged on the housing, the flexible circuit board includes a first area and a second area, the metal layer of the first area is electrically connected to the metal layer of the second area, the thickness of the first area is smaller than the thickness of the second area, and the first Area covers the valve. When thermal runaway occurs in the power supply device, the pressure in the accommodating cavity increases, and a large amount is generated, causing the metal layer in the first area to be flushed open by the valve or thermally blown off. Then, according to the disconnection of the electrical signal of the metal layer in the first region, it can be judged that the power supply device has thermal runaway, and an alarm signal can be issued, so that further emergency treatment can be carried out to reduce losses and improve the safety of the power supply device.

Description

A kind of power supply device and energy storage system

technical field

The present application relates to the technical field of power storage devices, in particular to a power supply device and an energy storage system.

Background technique

Since the appearance of the battery, it has brought great changes to people's lives, from small portable electronic devices (such as smartphones, smart watches, tablets and laptops, etc.) to large mobile devices (such as electric cars, electric trucks and electric Ships) all rely on the energy provided by batteries to run. Different application scenarios have different requirements for battery capacity and voltage, and unit batteries usually work in a series-parallel manner.

For example, in electric vehicles, electric trucks, and electric ships, since the power required for such scenarios can reach tens to hundreds of KWh, and the voltage often reaches hundreds to thousands of volts, several unit batteries are first connected in series and parallel. A battery pack with a certain capacity is formed.

The battery pack has the potential of thermal runaway, such as explosion or fire. There are also potential safety hazards for the equipment using the battery pack. Therefore, when the battery pack has thermal runaway, it can be detected in time and dealt with quickly, which can improve the safety of the battery pack.

Utility model content

The present application provides a power supply device and an energy storage system, so that when thermal runaway occurs in the power supply device, it can be detected in time, and the safety of the power supply device can be improved.

In a first aspect, the present application provides a power supply device, which includes a casing, a battery unit and a flexible circuit board. Wherein: the housing includes an accommodating cavity, the battery unit is arranged in the accommodating cavity, the housing has a valve port communicating with the accommodating cavity, and the valve port is connected with a valve. Specifically, the connection between the valve and the valve port is relatively weak. When the pressure in the accommodation chamber expands, the valve in the accommodation chamber will be disconnected from the valve port to release the pressure in the accommodation chamber. The above-mentioned flexible circuit board is arranged in the casing, the flexible circuit board includes a first area and a second area, the metal layer of the first area is electrically connected to the metal layer of the second area, the thickness of the first area is smaller than the thickness of the second area, and the thickness of the second area is smaller than that of the second area. A region covers the valve. When thermal runaway occurs in the power supply device, the pressure in the accommodating cavity increases, and a large amount is generated, causing the metal layer in the first region to be flushed open by the valve or thermally blown off. The above-mentioned flexible circuit board can be connected with the controller, and then the controller can judge the thermal runaway situation of the power supply device according to the disconnection of the electric signal of the metal layer in the above-mentioned first area, so as to send an alarm signal, so that further emergency treatment can be carried out to reduce losses , and can improve the safety of the power supply device.

In a specific technical solution, the form of the metal layer in the first region is not limited, for example, the metal layer in the first region is a metal wire or a metal sheet. The structure of the metal layer using metal wire or metal sheet is relatively simple, and the design is convenient, and the melting point and size of the metal layer for the first region are relatively easy to control.

When the metal layer in the first region is a metal wire, the cross-sectional area of the metal wire is less than or equal to 0.08 square millimeters.

When the metal layer in the first region is a metal sheet, the width of the metal sheet is less than or equal to half of the width of the valve.

When the metal layer in the first region is a metal sheet, the thickness of the metal sheet is less than or equal to 0.05 mm.

The above-mentioned metal wires and metal sheets meet the above-mentioned size requirements, so that when thermal runaway occurs in the power supply device, the metal layer in the first region can respond quickly, so as to deal with the thermal runaway of the power supply device as soon as possible.

In addition, the melting point range of the metal layer in the above-mentioned first region can be adjusted according to different types of batteries, for example, the melting point range of the ternary type battery should be lower than 1000 degrees Celsius, and the melting point range of the iron-lithium type battery should be lower than 700 degrees Celsius. In order to ensure that when thermal runaway occurs in the power supply device, the metal layer in the first region can be fused relatively quickly to send a signal.

The above-mentioned first area is not limited in the shape of the flexible circuit board. In one technical solution, the above-mentioned first area is arranged between two second areas, the metal layer of the first area is a metal part, and the two ends of the metal part Weld with the adjacent second area respectively. The above-mentioned flexible circuit board may not be an integral structure, for example, it includes a plurality of the above-mentioned second regions, and the above-mentioned metal parts are used to connect adjacent second regions.

In another technical solution, the above-mentioned first region and the second region are integrally structured. That is to say, the above-mentioned flexible circuit board has an integrated structure, and the first area and the second area are different areas of the flexible circuit board. This solution is beneficial to simplify the installation process of the flexible circuit board.

In this solution, the metal layer in the first region and the metal layer in the second region form a circuit pattern. The scheme can realize the reuse of the flexible circuit board, and is beneficial to reduce the cost of the power supply device.

Further, the above casing includes multiple accommodating cavities and multiple battery cells, each accommodating cavity is provided with a battery cell; the flexible circuit board includes multiple first regions; the valve of each casing is covered with at least one first an area. This solution can monitor the thermal runaway of the battery cells in each accommodating cavity. In addition, multiple accommodation chambers can be changed to determine the position of the battery experiencing thermal runaway, so as to facilitate accurate positioning and timely processing.

In a specific technical solution, the above-mentioned flexible circuit board is also used to monitor the voltage and temperature of the power supply device. This solution can realize the multiplexing of the flexible circuit board, and when it is used to detect the voltage and temperature of the power supply device, the flexible circuit board has the serial number information corresponding to the above-mentioned storage chamber or the battery unit in the storage chamber, then the monitoring battery unit appears In case of thermal runaway, the above numbered signals can also be multiplexed. This solution is beneficial to reduce the cost of the power supply device.

The above-mentioned power supply device may also include a controller, which is connected to the flexible circuit board. When the controller detects that the circuit in the first area of the flexible circuit board is disconnected, the controller is used to control the battery corresponding to the first area where the circuit is disconnected. stop working.

In a further technical solution, the above-mentioned controller is also connected to the fire-fighting module; when the controller detects that the circuit in the first area of the flexible circuit board is disconnected, the controller is used to control the fire-fighting module to start. The fire-fighting module can timely extinguish the fire of the battery unit with thermal runaway, so as to reduce the explosion or fire of the power supply device.

The specific type of the above-mentioned power supply device is not limited. In one technical solution, the above-mentioned power supply device is a battery module, and the battery unit is a battery. In another technical solution, the above-mentioned power supply device may be a battery, and the battery unit is an electric cell. As long as there is a power supply device in which thermal runaway occurs, the technical solution of the present application is applicable.

In a second aspect, the present application also provides an energy storage system. The energy storage system includes a power converter and the power supply device of the first aspect above. The above-mentioned power converter is used to convert the current input into the power supply device, and/or is used to convert the current output from the power supply device. The energy storage system has a low probability of large-scale fire or explosion, which is conducive to improving the safety of the energy storage system.

In the specific technical solution, the specific type of the above-mentioned energy storage system is not limited. For example, the above-mentioned energy storage system may include a power distribution cabinet, a power exchange cabinet, or a vehicle-mounted device.

Description of drawings

FIG. 1 is a schematic structural diagram of a power supply device in an embodiment of the present application;

FIG. 2 is a schematic diagram of a partial structure of a power supply device in an embodiment of the present application;

FIG. 3 is a schematic diagram of another partial structure of the power supply device in the embodiment of the present application;

FIG. 4 is a schematic diagram of another partial structure of the power supply device in the embodiment of the present application;

Fig. 5 is another schematic structural diagram of the power supply device in the embodiment of the present application;

FIG. 6 is a schematic diagram of another partial structure of a power supply device in an embodiment of the present application.

Reference signs:

1 - shell;

11-Accommodating cavity;

12-valve port;

2 - battery unit;

3-Flexible circuit board;

31 - first zone;

32 - Second area.

Detailed ways

The terms used in the following examples are for the purpose of describing particular examples only, and are not intended to limit the application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also Expressions such as "one or more" are included unless the context clearly dictates otherwise.

Reference to "one embodiment" or "a particular embodiment" or the like described in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. The terms "including", "comprising", "having" and variations thereof mean "including but not limited to", unless specifically stated otherwise.

In order to facilitate the understanding of the power supply device and the energy storage system provided by the embodiment of the present application, the following first introduces its application scenarios. During the use of electronic equipment, a power supply device is usually required to supply power to it. At present, various electronic devices, such as energy storage base stations and electric vehicles, usually choose battery packs formed by secondary batteries such as lithium-ion batteries, lead-acid batteries, sodium batteries, magnesium batteries, aluminum batteries, and potassium batteries as power supply devices. Wherein, in the embodiment of the present application, a secondary battery (rechargeable battery) is also called a rechargeable battery, a power battery or a storage battery, and specifically refers to a battery that can activate active materials by charging after the battery is discharged and continue to be used. During use, the battery may suffer from thermal runaway due to short circuit and other reasons. Therefore, it is of great significance to detect the thermal runaway of the battery in time to ensure the safety of electronic equipment with the battery.

In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic structural diagram of a power supply device in the embodiment of the present application. As shown in FIG. 1 , the power supply device in the embodiment of the present application includes a casing 1 , a battery unit 2 and a flexible circuit board 3 . Wherein: the housing 1 includes an accommodating cavity 11 , and the battery unit 2 is disposed in the accommodating cavity 11 . The housing 1 has a valve port 12 communicating with the accommodating cavity 11, and the valve port 12 is connected with a valve. The above-mentioned flexible circuit board 3 is disposed on the housing 1 , specifically, it may be disposed on the surface of the housing 1 , for example, the flexible circuit board 3 is disposed on the surface of the housing 1 facing away from the battery unit 2 . The above-mentioned flexible circuit board 3 includes a first area 31 and a second area 32 , the thickness of the first area 31 is smaller than that of the second area 32 , and the first area 31 covers the valve. The metal layer in the first region 31 is electrically connected to the metal layer in the second region 32 , and can be used to transmit electrical signals. When thermal runaway occurs in the power supply device, the gas in the accommodating chamber 11 will accumulate, resulting in an increase in the pressure in the accommodating chamber 11 and possibly generating a large amount of heat. The pressure in the accommodating cavity 11 will cause the valve of the housing 1 to open, thereby breaking away the metal layer in the first region 31 , or the heat will cause the metal layer in the first region 31 to melt, thereby causing the metal layer in the first region 31 to melt. The electrical signal is disconnected. The above-mentioned flexible circuit board 3 can be connected with the controller, and then the controller can judge the thermal runaway situation of the power supply device according to the disconnection of the electric signal of the metal layer in the above-mentioned first area 31, so as to send an alarm signal, so that further emergency treatment can be carried out, so as to The loss is reduced, and the safety of the power supply device can be improved.

The specific manner of the alarm signal sent by the above controller is not limited. Specifically, the power supply device may be further provided with an alarm, such as a buzzer or a warning light. The controller is connected to the above-mentioned alarm device, and the alarm device receives the alarm signal sent by the controller, and sends out an alarm according to the received alarm signal, that is, the controller controls the above-mentioned alarm device to send out an alarm. Alternatively, the controller may include a wireless connection module, through which an alarm signal is sent to a user's terminal, such as a mobile phone, a computer, or a display screen of a car, to remind the user.

Specifically, the airtightness of the accommodating chamber 11 satisfies an IP (ingress protection) grade of at least IP20, thereby reducing the diffusion of the fire-fighting agent in the accommodating chamber 11, and shortening the time for the gas sensor 3 to detect the leakage of the fire suppression device. It is also beneficial to improve the accuracy of the gas sensor 3 in detecting the leakage of the fire suppression device. For example, the airtightness of the accommodating cavity 11 satisfies the IP grade of IP21, IP25, IP27, IP30, IP32, IP35, IP40, IP42, IP45, IP50, IP53, IP57, IP60, IP61, IP63, IP65, IP66 or IP67, etc. . Further, the airtightness of the accommodating chamber 11 can be made to meet an IP rating greater than IP55.

The melting point range of the metal layer in the first region can be adjusted according to different types of batteries. For example, the melting point range of the ternary type battery should be lower than 1000 degrees Celsius, and the melting point range of the iron-lithium type battery should be lower than 700 degrees Celsius. In order to ensure that when thermal runaway occurs in the power supply device, the metal layer in the first region can be fused relatively quickly to send a signal.

In addition, in specific embodiments, the shape of the metal layer in the first region is not limited, for example, the metal layer in the first region is a metal wire or a metal sheet. The metal layer only needs to be able to transmit signals and be disconnected when thermal runaway occurs. Moreover, the structure of the metal layer using metal wire or metal sheet is relatively simple, and the design is convenient, and the melting point and size of the metal layer for the first region are relatively easy to control. In other embodiments, the metal layer in the above-mentioned first region may also be a circuit pattern, which is beneficial to realize the reuse of the flexible circuit board.

When the metal layer in the first region is a metal wire, the cross-sectional area of the metal wire is less than or equal to 0.08 square millimeters. For example, the above-mentioned metal wire may have a cross-sectional area of 0.01 square millimeters, 0.02 square millimeters, 0.03 square millimeters, 0.04 square millimeters, 0.05 square millimeters, 0.06 square millimeters or 0.07 square millimeters.

When the metal layer in the first region is a metal sheet, the metal sheet as a three-dimensional structure includes dimensions in three directions, namely length, width and thickness, wherein the length is greater than the width and greater than the thickness. Conversely, among the dimensions of the three directions of the metal sheet, the smallest dimension is the thickness, and the largest dimension is the length.

The width of the metal sheet is less than or equal to half of the width of the valve. For example, the width of the metal sheet may be one third of the width of the valve, etc. Specifically, the ratio of the width of the metal sheet to the width of the valve is an important consideration. The width of the above-mentioned valve refers to the dimension in the same direction as the width direction of the valve and the above-mentioned metal sheet. In particular, when the valve is a circular valve, the aforementioned width is the diameter of the circular valve. In other words, the width can be understood as the maximum dimension of the valve in the same direction as the width direction of the metal sheet.

In addition, the thickness of the metal sheet is less than or equal to 0.05 mm. For example, the thickness of the above metal sheet can be 0.1 mm, 0.2 mm, 0.25 mm, 0.3 mm or 0.4 mm and so on.

The above-mentioned metal wires and metal sheets meet the above-mentioned size requirements, so that when thermal runaway occurs in the power supply device, the metal layer in the first region can respond quickly, so as to deal with the thermal runaway of the power supply device as soon as possible.

FIG. 2 is a schematic diagram of a partial structure of a power supply device in an embodiment of the present application. As shown in FIG. 2 , in one embodiment, the first region 31 is arranged between two second regions 32, and the The metal layer is a metal component, and the two ends of the metal component are respectively welded to the adjacent second regions 32 . In this solution, the above-mentioned flexible circuit board 3 may not be an integral structure, for example, it may include a plurality of the above-mentioned second regions 32 , and the above-mentioned metal parts are used to connect the adjacent second regions 32 . In a specific embodiment, the above-mentioned metal component may be connected to the metal layer of the above-mentioned second region 32 by welding.

In a specific embodiment, the shape of the metal component is not limited, for example, the metal component may be a metal wire or a metal sheet. Specifically, it can be designed according to actual needs. For example, it can be selected and designed according to the temperature and/or pressure of the high-temperature gas that drives the valve of the housing 1 to open, so that the metal parts can be disconnected in time when the power supply device is thermally out of control.

Fig. 3 is a schematic diagram of another partial structure of the power supply device in the embodiment of the present application. As shown in Fig. 3, in another embodiment, the above-mentioned first area 31 and the second area 32 are integrally structured. Specifically, the above-mentioned flexible circuit board 3 has an integral structure, and the first region 31 and the second region 32 are different regions of the flexible circuit board 3 . Certainly, in a specific embodiment, the power supply device may include multiple flexible circuit boards 3 , and each flexible circuit board 3 includes a first area 31 and a second area 32 . In this embodiment, the first region 31 of the flexible circuit board 3 can be etched, so that the metal layer surface of the first region 31 only has a thinner insulating layer, so that the first region 31 is easier to be washed away, The metal layer in the first region 31 is relatively easy to be melted.

When the first region 31 and the second region 32 are integrated, the metal layer of the first region 31 may also be a metal wire or a metal sheet, which is not limited in the present application. Specifically, it can be designed according to actual needs. For example, it can be selected and designed according to the temperature and/or pressure of the high-temperature gas that drives the valve of the housing 1 to open, so that the metal parts can be disconnected in time when the power supply device is thermally out of control.

Fig. 4 is a schematic diagram of another partial structure of the power supply device in the embodiment of the present application. As shown in Fig. 4, in another embodiment, when the first region 31 and the second region 32 are integrated, the first region The metal layer at 31 and the metal layer at the second region 32 form a circuit pattern. In this technical solution, the flexible circuit board 3 in the prior art is used. The application does not limit the functions to be realized by the above circuit patterns. The flexible circuit board 3 can be a circuit board that realizes any function of the power supply device. In this embodiment, the flexible circuit board 3 required by the power supply device itself can be used, which is beneficial to reduce the cost of the power supply device.

FIG. 5 is another schematic structural view of the power supply device in the embodiment of the present application, and FIG. 6 is another partial structural schematic view of the power supply device in the embodiment of the present application. As shown in FIG. 5 and FIG. 6 , in a specific embodiment, the housing 1 includes a plurality of accommodating cavities 11 and a plurality of battery units 2 , and each of the accommodating cavities 11 is provided with a battery unit 2 . Specifically, a plurality of accommodating chambers 11 and a plurality of battery cells 2 can be arranged in one-to-one correspondence, and a plurality of battery cells 2 can be arranged in one accommodating chamber 11, or, individual accommodating chambers 11 can be provided without A battery unit 2 is provided, which is not limited in this application. In order to monitor the thermal runaway of the battery cells 2 in each accommodating chamber 11 , the flexible circuit board 3 includes a plurality of first regions 31 , and each valve of the housing 1 is covered with at least one first region 31 . In this embodiment, the thermal runaway of the battery cells 2 in each accommodating cavity 11 can be monitored. Specifically, the accommodating cavities 11 or the battery cells 2 in the accommodating cavities 11 can be numbered, so that each accommodating cavity 11 or the battery cells 2 in the accommodating cavities 11 has number information, so that the first flexible circuit board 3 The area 31 corresponds to the above number information. When a signal disconnection occurs in a certain first area 31, the battery unit 2 that has thermal runaway can be determined according to the above number information, and the battery unit 2 is powered off, and corresponding measures are taken. fire protection measures etc. This scheme can shorten the scope of explosion or fire as much as possible to reduce losses.

When the flexible circuit board 3 includes multiple first regions 31 , metal layers in different first regions 31 may be connected in series and/or in parallel, which is not limited in the present application. Specifically, when the metal layers in the above-mentioned different first regions 31 are connected in parallel, the number of ports of the controller is required to be relatively high; Get the signal of thermal runaway quickly.

In one embodiment, the above-mentioned flexible circuit board 3 can be used to monitor the voltage and temperature of the power supply device. This scheme can realize the multiplexing of the flexible circuit board 3, and when it is used to detect the voltage and temperature of the power supply device, the flexible circuit board 3 has the number information corresponding to the above-mentioned storage chamber 11 or the battery unit 2 in the storage chamber 11, Then, when the thermal runaway of the battery unit 2 is monitored, the above numbered signals may also be multiplexed. This embodiment is beneficial to reduce the cost of the power supply device.

The above-mentioned power supply device includes a controller, and the controller is connected with the above-mentioned flexible circuit board 3 . Specifically, the above-mentioned controller is connected to the metal layer of the flexible circuit board 3 , so that when the metal layer of the first region 31 is disconnected, the controller can receive a signal that the circuit is disconnected. When the controller detects that the circuit in the first area 31 of the flexible circuit board 3 is disconnected, the controller judges that the battery unit 2 of the power supply device has thermal runaway. The battery stops working.

In an embodiment, the above-mentioned power supply device may include a battery management unit (battery management unit, BMU), and the battery management unit may serve as the controller in the embodiment of the present application.

In order to deal with the thermally runaway battery unit 2 in a timely manner, the above-mentioned controller is also connected to the fire protection module, when the controller detects that the circuit in the first area 31 of the flexible circuit board 3 is disconnected. The controller can be used to control the start of the fire-fighting module, and the fire-fighting module can timely extinguish the fire of the battery unit 2 where thermal runaway occurs, so as to reduce the explosion or fire of the power supply device. The above-mentioned fire fighting device is used to hold the fire extinguishing agent, and when it is necessary to extinguish the fire, the fire extinguishing agent can be sprayed to extinguish the fire.

In a specific embodiment, the above-mentioned fire-fighting module may be a part of the power supply device, or a module other than the power supply device. In addition, the above-mentioned fire-fighting modules can be in one-to-one correspondence with the battery units 2, so that when a certain battery unit 2 suffers from thermal runaway, only the corresponding fire-fighting module can be activated.

The present application does not limit the type of the above-mentioned power supply device. In one embodiment, the above-mentioned power supply device may be a battery module, and the above-mentioned battery unit 2 is a battery. A plurality of batteries can be connected in series or in parallel to form the above-mentioned battery module. In some embodiments, the above-mentioned battery module can also be called a battery pack or a battery box.

In another embodiment, the above-mentioned power supply device is a battery, and the above-mentioned battery unit 2 is an electric cell. The above-mentioned battery can be formed by connecting multiple cells in series or in parallel.

The specific type of the above-mentioned batteries is not limited, for example, lithium-ion batteries, lead-acid batteries, sodium batteries, magnesium batteries, aluminum batteries, and potassium batteries can be used.

Based on the same idea, the present application also provides an energy storage system, which includes a power converter and the power supply device in any one of the above embodiments. The above-mentioned power converter is electrically connected with the power supply device, and is used to convert the current input into the power supply device; or, the above-mentioned power converter can also be used to convert the current output from the power supply device; or, the above-mentioned power converter can also be used It is used to convert the current input to the power supply device, and is used to convert the current output from the power supply device. The gas sensor in the energy storage system can monitor the leakage of the fire suppression device in time, ensure the fire extinguishing capability of the fire suppression module, improve the safety of the power supply device, and improve the safety of the energy storage system.

In an optional embodiment, the above-mentioned energy storage system includes a power distribution cabinet, a power exchange cabinet or vehicle-mounted equipment, which are not listed here.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the application, and should cover Within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (16)

1. A power supply device, characterized in that it comprises a housing, a battery unit and a flexible circuit board, wherein: The housing includes an accommodating cavity, the battery unit is arranged in the accommodating cavity, the housing has a valve port communicating with the accommodating cavity, and the valve port is connected with a valve; The flexible circuit board is disposed on the housing, the flexible circuit board includes a first area and a second area, the metal layer of the first area is electrically connected to the metal layer of the second area, and the first area The thickness of the region is less than the thickness of the second region, the first region covering the valve. 2. The power supply device according to claim 1, wherein the metal layer in the first region is a metal wire or a metal sheet. 3. The power supply device according to claim 2, wherein the metal layer in the first region is a metal wire, and the cross-sectional area of the metal wire is less than or equal to 0.08 square millimeters. 4. The power supply device according to claim 2, wherein the metal layer in the first region is a metal sheet, and the width of the metal sheet is less than or equal to half of the width of the valve. 5. The power supply device according to claim 2 or 4, wherein the metal layer in the first region is a metal sheet, and the thickness of the metal sheet is less than or equal to 0.05 mm. 6. The power supply device according to any one of claims 1-5, wherein the first region is disposed between two second regions, the metal layer of the first region is a metal component, Both ends of the metal component are respectively welded to the adjacent second region. 7. The power supply device according to any one of claims 1-5, characterized in that, the first area and the second area are integrally structured. 8. The power supply device according to claim 7, wherein the metal layer in the first region and the metal layer in the second region form a circuit pattern. 9. The power supply device according to any one of claims 1-8, characterized in that, the housing comprises a plurality of the accommodating cavities and a plurality of the battery units, each of the accommodating cavities is provided with There is the battery unit; the flexible circuit board includes a plurality of the first regions; each of the valves of the casing is covered with at least one of the first regions. 10. The power supply device according to any one of claims 1-9, wherein the flexible circuit board is also used to monitor the voltage and temperature of the power supply device. 11. The power supply device according to any one of claims 1-10, further comprising a controller connected to the flexible circuit board, when the controller detects that the flexible circuit board When the circuit in the first region is disconnected, the controller is used to control the battery corresponding to the first region where the circuit is disconnected to stop working. 12. The power supply device according to claim 11, wherein the controller is also connected to the fire protection module; when the controller detects that the circuit in the first area of the flexible circuit board is disconnected, the control controller is used to control the start of the fire module. 13. The power supply device according to any one of claims 1-12, wherein the power supply device is a battery module, and the battery unit is a battery. 14. The power supply device according to any one of claims 1-12, wherein the power supply device is a battery, and the battery unit is an electric cell. 15. An energy storage system, characterized in that it comprises a power converter and the power supply device according to any one of claims 1 to 14, the power converter is used to convert the current input into the power supply device, and /or, used for converting the current output from the power supply device. 16. The energy storage system according to claim 15, wherein the energy storage system comprises a power distribution cabinet, a power exchange cabinet or vehicle-mounted equipment.