Battery device and energy storage system

Abstract

The embodiment of the utility model provides battery equipment and an energy storage system, which can reduce safety accidents caused by overhigh voltage of a battery monomer, thereby effectively improving the overall performance of the battery equipment. The battery device includes: a battery cell; the on-off device is connected with the battery monomers in series; and the first control unit is used for controlling the on-off device to disconnect the connection with the single battery under the condition that the voltage of the single battery reaches a voltage threshold value.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery device and an energy storage system. Background Art

[0002] With the promotion and application of new energy sources such as solar energy and wind energy, energy storage technology has developed accordingly. In energy storage systems, traditional fuses are usually connected in series with the battery circuit. When the circuit current reaches the protection condition of the traditional fuse, the traditional fuse performs fuse protection. However, traditional fuses cannot prevent other abnormal conditions of the energy storage system and only trigger protection when the circuit current reaches the protection condition of the traditional fuse. Utility Model Content

[0003] The embodiments of the present application provide a battery device and an energy storage system, which can reduce safety accidents caused by excessive voltage of battery cells, thereby effectively improving the overall performance of the battery device.

[0004] In a first aspect, a battery device is provided, comprising: a battery cell; a switching device connected in series with the battery cell; and a first control unit, for controlling the switching device to disconnect the battery cell when the voltage of the battery cell reaches a voltage threshold.

[0005] In the embodiment of the present application, the on-off device is connected in series with the battery cell, and when the voltage of the battery cell reaches a voltage threshold, the first control unit controls the on-off device to disconnect from the battery cell. In this way, safety accidents caused by excessively high voltage of the battery cell can be reduced. For example, the possibility of battery overcharging caused by continuous charging of the battery device by an external power source can be reduced, thereby effectively improving the overall performance of the battery device.

[0006] In some possible implementations, the first control unit is specifically used to: when the voltage of the battery cell reaches the voltage threshold, send first control information to the on-off device, the first control information being used to control the on-off device to disconnect from the battery cell; the on-off device is also used to: disconnect from the battery cell in response to the first control information sent by the first control unit.

[0007] In the above technical solution, when the voltage of the battery cell reaches the voltage threshold, the first control unit sends the first control information to the on-off device to control the on-off device to disconnect the battery cell, so that when the voltage of the battery cell becomes abnormal, the on-off device can perform protection more quickly and disconnect the circuit, thereby minimizing the possibility of safety accidents caused by excessive voltage of the battery cell.

[0008] In some possible implementations, the battery cell supplies power to the first control unit.

[0009] The battery cells are used to power the first control unit, so that the battery device can be self-powered, and the entire battery device can be operated without external voltage input. Furthermore, the battery cells are reused to power the first control unit, and there is no need to set up an additional power supply module in the battery device, which not only reduces the size of the battery device, but also reduces the production cost of the battery device.

[0010] In some possible implementations, a voltage sampling line is provided between the first control unit and the battery cell, the first control unit collects the voltage of the battery cell through the voltage sampling line, and the battery cell supplies power to the first control unit through the voltage sampling line.

[0011] In this technical solution, the battery cell supplies power to the first control unit via the voltage sampling line, that is, the voltage sampling line is reused to supply power to the first control unit, which simplifies the connection between the first control unit and the battery cell, not only reducing the internal space of the battery device occupied by the connection between the first control unit and the battery cell, but also reducing the connection cost between the first control unit and the battery cell.

[0012] In some possible implementations, a sampling interface and a power supply interface are provided on the first control unit, and a voltage sampling line and a power supply line are provided between the first control unit and the battery cell, the voltage sampling line is connected to the sampling interface, and the power supply line is connected to the power supply interface, the first control unit collects the voltage of the battery cell through the voltage sampling line, and the battery cell supplies power to the first control unit through the power supply line.

[0013] In this technical solution, the circuit for the first control unit to collect the battery cell voltage is different from the circuit for the battery cell to supply power to the first control unit, so that the collected voltage and the power supply can be controlled separately, which reduces the complexity of control and further reduces the probability of misoperating the collected voltage as the power supply or misoperating the power supply as the collected voltage.

[0014] In some possible implementations, the first control unit is further connected to a power module outside the battery device, so that the power module supplies power to the first control unit.

[0015] In some possible implementations, the power module is a power module of an energy storage system, and the energy storage system includes the battery device.

[0016] The above technical solution reuses the power module in the energy storage system to supply power to the first control unit, which can reduce the power supply cost for the first control unit.

[0017] In some possible implementations, the first control unit is further configured to control the on / off device to disconnect the battery cell when an abnormality occurs outside the battery device.

[0018] In the above technical solution, when an abnormality occurs outside the battery device, the first control unit controls the on-off device to disconnect the battery cell. In this way, when an abnormality occurs outside the battery device, the probability of the battery device also becoming abnormal due to the external abnormality is reduced, that is, the possibility of the abnormality spreading is reduced, and the battery device is protected to a certain extent. Furthermore, the diversity of application scenarios of the battery device in the embodiment of the present application is increased, so that it can be applied to more scenarios.

[0019] In some possible implementations, the first control unit is connected to a second control unit of an energy storage system, and the energy storage system includes the battery device; the first control unit is specifically used to: receive abnormal information sent by the second control unit, and the abnormal information is used to indicate that an abnormality has occurred outside the battery device; in response to the abnormal information, send second control information to the on-off device, and the second control information is used to control the on-off device to disconnect from the battery cell.

[0020] In the above technical solution, the first control unit controls the on-off device to perform a protection action and disconnect the circuit by receiving abnormal information sent by the second control unit to indicate an external abnormality of the battery device, so that the on-off device can disconnect the circuit with a faster response speed, thereby minimizing the possibility of abnormalities in the battery device due to external faults.

[0021] In some possible implementations, the battery device includes a fuse device, and the fuse device includes the first control unit and the switching device.

[0022] In some possible implementations, the fuse device further includes a current monitoring fuse connected in series with the on-off device, and the current monitoring fuse is used to disconnect the battery cell when the current of the battery cell reaches a current threshold.

[0023] In the above technical solution, the fuse device also includes a current monitoring fuse for disconnecting the battery cell when the current of the battery cell reaches a current threshold. This not only reduces the possibility of a series of unsafe accidents caused by excessive current, but also increases the diversity of application scenarios of the battery equipment in the embodiment of the present application, making it suitable for more scenarios.

[0024] In some possible implementations, the current monitoring fuse is further used to disconnect the battery cell when a short circuit occurs in the battery device.

[0025] In this way, when a short circuit occurs in the battery device, the current monitoring fuse disconnects from the battery cell, i.e., cuts off the circuit, which not only reduces the possibility of a series of unsafe accidents caused by the short circuit, but also increases the diversity of application scenarios of the battery device of the embodiment of the present application, making it applicable to more scenarios.

[0026] In some possible implementations, the current monitoring fuse is specifically used to: spontaneously disconnect the connection with the battery cell in response to short-circuit information of the battery device.

[0027] This technical solution enables the current monitoring fuse to automatically disconnect from the battery cell when a short circuit occurs in the battery device, thereby reducing the time from the occurrence of a short circuit in the battery device to the current monitoring fuse cutting off the circuit, thereby reducing the possibility of a series of unsafe accidents caused by the short circuit in a shorter period of time.

[0028] In some possible implementations, there are multiple battery cells, and the multiple battery cells are connected in series, parallel or mixed, wherein the first control unit is specifically used to: collect the voltages of some of the multiple battery cells; and control the on-off device to disconnect the battery cell when the voltage of at least one of the battery cells reaches the voltage threshold.

[0029] According to this technical solution, when there are multiple battery cells, the first control unit collects the voltages of some of the multiple battery cells. This not only simplifies the connection between the first control unit and the battery cells, but also reduces the amount of battery cell voltages collected by the first control unit, thereby reducing the amount of calculation of the first control unit and improving the operational efficiency of the first control unit.

[0030] In a second aspect, an energy storage system is provided, comprising one or more battery devices according to the first aspect or its implementations.

[0031] In some possible implementations, the energy storage system further includes: a power module connected to the battery device and configured to supply power to the first control unit.

[0032] In some possible implementations, the energy storage system further includes a second control unit, which is connected to the first control unit; wherein the second control unit is used to detect the external state of the battery device, and when an abnormality is detected on the outside of the battery device, the second control unit sends abnormality information to the first control unit, wherein the abnormality information is used to indicate that an abnormality has occurred on the outside of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram showing the connection between a conventional fuse and a battery circuit is shown.

[0034] Figure 2 A schematic diagram of a battery device according to an embodiment of the present application is shown.

[0035] Figure 3 An exploded view of a battery cell according to an embodiment of the present application is shown.

[0036] Figure 4 A schematic diagram of another battery device according to an embodiment of the present application is shown.

[0037] Figure 5 A schematic diagram showing yet another battery device according to an embodiment of the present application is shown.

[0038] Figure 6 A schematic diagram showing the connection between a battery device and an external power module according to an embodiment of the present application is shown.

[0039] Figure 7 A schematic diagram showing the connection between a battery device and a second control unit according to an embodiment of the present application is shown.

[0040] Figure 8 A schematic diagram showing the connection between another battery device and a second control unit according to an embodiment of the present application is shown.

[0041] Fig. 9 A schematic diagram of an energy storage system according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application 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 drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0044] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0046] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0047] With the promotion and application of new energy sources such as solar energy and wind energy, energy storage technology has developed accordingly. The energy storage system may include one or more battery devices. Among them, the battery device may include a box and one or more battery cells encapsulated by the box. In the embodiment of the present application, the battery device may also be referred to as a battery pack, a battery module, or a battery module.

[0048] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiments of the present application.

[0049] In energy storage systems, Figure 1As shown, a traditional fuse is usually connected in series with the battery circuit. When the circuit current reaches the protection condition of the traditional fuse, the traditional fuse performs fuse protection. However, the traditional fuse cannot prevent other abnormal conditions of the energy storage system, and the protection is triggered only when the circuit current reaches the protection condition of the traditional fuse.

[0050] In view of this, an embodiment of the present application provides a battery device, which may include a battery cell, a switching device, and a first control unit. The switching device is connected in series with the battery cell, and the first control unit is used to control the switching device to disconnect the battery cell when the voltage of the battery cell reaches a voltage threshold. In this way, safety accidents caused by excessive voltage of the battery cell can be reduced, such as reducing the possibility of battery overcharging caused by continuous charging of the battery device by an external power supply, thereby effectively improving the overall performance of the battery device.

[0051] Figure 2 A schematic diagram of a battery device 200 according to an embodiment of the present application is shown. For example, the battery device 200 can be applied to an energy storage system.

[0052] like Figure 2 As shown, the battery device 200 may include a battery cell 210, a switching device 220, and a first control unit 230. The switching device 220 is connected in series with the battery cell 210, and the first control unit 230 is used to control the switching device 220 to disconnect the battery cell 210 when the voltage of the battery cell 210 reaches a voltage threshold.

[0053] in, Figure 2 B+ and B− in the figure are respectively the positive electrode and the negative electrode of the battery device 200.

[0054] The first control unit 230 may be specifically used to collect the voltage of the battery cell 210 , and when the voltage of the battery cell 210 reaches a voltage threshold, control the on-off device 220 to disconnect from the battery cell 210 , that is, control the on-off device 220 to cut off the circuit.

[0055] Optionally, the first control unit 230 may randomly collect the voltage of the battery cell 210. For example, the interval between the first collection of the voltage of the battery cell 210 and the second collection of the voltage is 3 ms, and the interval between the second collection and the third collection is 5 ms.

[0056] Optionally, the first control unit 230 may collect the voltage of the battery cell 210 at every preset time period. The preset time period may be, for example, 5 ms, 10 ms, or 20 ms.

[0057] Alternatively, the battery device 200 may include a battery management system (BMS), which is used to collect the voltage of the battery cell 210 and send voltage information to the first control unit 230, where the voltage information includes the voltage of the battery cell 210 collected by the BMS.

[0058] Of course, the first control unit 230 may also be a BMS or other control units.

[0059] It should be noted that, in the above content, the voltage of the battery cell 210 reaches the threshold value can be understood as the voltage of the battery cell 210 has reached the threshold value, or is about to reach the threshold value.

[0060] In the embodiment of the present application, the on-off device 220 is connected in series with the battery cell 210, and when the voltage of the battery cell 210 reaches a voltage threshold, the first control unit 230 controls the on-off device 220 to disconnect from the battery cell 210. In this way, safety accidents caused by excessive voltage of the battery cell 210 can be reduced. For example, the possibility of battery overcharging caused by continuous charging of the battery device 200 by an external power source can be reduced, thereby effectively improving the overall performance of the battery device 200.

[0061] Figure 3 A schematic exploded view of a battery cell 210 according to an embodiment of the present application is shown.

[0062] like Figure 3 As shown, the battery cell 210 includes one or more electrode assemblies 21, a shell 22 and an end cap assembly 23, wherein the wall of the shell 22 and the end cap assembly 23 are both referred to as the wall of the battery cell 210. The shell 22 is determined according to the shape of the one or more electrode assemblies 21 after being combined. For example, the shell 22 may be a hollow cuboid or a cube or a cylinder, and one of the faces of the shell 22 has an opening so that one or more electrode assemblies 21 can be placed in the shell 22. For example, when the shell 22 is a hollow cuboid or a cube, one of the planes of the shell 22 is an open face, that is, the plane does not have a wall body so that the shell 22 communicates with the inside and outside. When the shell 22 may be a hollow cylinder, the end face of the shell 22 is an open face, that is, the end face does not have a wall body so that the shell 22 communicates with the inside and outside. The end cap assembly 24 covers the opening and is connected to the shell 22 to form a closed cavity for placing the electrode assembly 21. The shell 22 is filled with an electrolyte, such as an electrolyte.

[0063] The battery cell 210 also includes two electrode terminals 214. The end cap assembly 23 is generally in the shape of a flat plate, and the two electrode terminals 214 are fixed on the flat surface of the end cap assembly 23, and the two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connection member 24, or it can also be called a current collecting member, which is located between the end cap assembly 23 and the electrode assembly 21, and is used to electrically connect the electrode assembly 21 and the electrode terminal 214.

[0064] like Figure 3 As shown, each electrode assembly 21 has a first pole tab 211a and a second pole tab 212a. The polarities of the first pole tab 211a and the second pole tab 212a are opposite. For example, when the first pole tab 211a is a positive pole tab, the second pole tab 212a is a negative pole tab. The first pole tab 211a of one or more electrode assemblies 21 is connected to an electrode terminal 214 through a connecting member 24, and the second pole tab 212a of one or more electrode assemblies 21 is connected to another electrode terminal 214 through another connecting member 24. For example, the first pole tab 211a is a positive pole tab, the second pole tab 212a is a negative pole tab, the positive electrode terminal 214a is connected to the first pole tab 211a through a connecting member 24, and the negative electrode terminal 214b is connected to the second pole tab 212a through another connecting member 24.

[0065] In the battery cell 210, the electrode assembly 21 can be provided as a single electrode assembly or multiple electrodes according to actual use requirements. Figure 3 As shown, four independent electrode assemblies 21 are arranged in the battery cell 210 .

[0066] As an example, a pressure relief mechanism 213 may be further provided on one wall of the battery cell 210. The pressure relief mechanism 213 is used to be actuated to release the internal pressure or temperature of the battery cell 210 when the internal pressure or temperature reaches a threshold.

[0067] Optionally, the pressure relief mechanism 213 may be disposed on the end cover assembly 23 , or on any wall of the housing 22 .

[0068] The number of battery cells 210 may be one. Figure 2 As shown, there may be a plurality of battery cells 210, and the plurality of battery cells 210 are connected in series, in parallel or in a hybrid manner, wherein the hybrid means a mixture of series and parallel.

[0069] In a possible implementation, multiple battery cells 210 may be distributed into multiple columns, each column of battery cells 210 may be divided into two clusters, the two clusters are connected in parallel, and the battery cells 210 in each cluster are connected in series. Exemplarily, the battery device 200 may include four columns of batteries, each column of batteries may be divided into two parallel battery clusters, each battery cluster may include four batteries, and each battery may include 104 battery cells 210 connected in series.

[0070] Of course, each column of battery cells 210 may also be a cluster, which is not specifically limited in the present application.

[0071] The battery cluster is a battery assembly in which batteries are connected in series, parallel or series-parallel. One battery cluster may correspond to one slave battery management unit (SBMU), and multiple battery clusters may correspond to one master battery management unit (MBMU).

[0072] When there are multiple battery cells 210, the first control unit 230 can be specifically used to: collect the voltages of some battery cells 210 among the multiple battery cells 210, and control the on-off device 220 to disconnect from the battery cell 210 when the voltage of at least one battery cell 210 among the some battery cells 210 reaches a voltage threshold.

[0073] For example, the first control unit 230 may collect the voltage of any one of the plurality of battery cells 210 . For another example, the first control unit 230 may collect the voltage of any at least two of the plurality of battery cells 210 .

[0074] It should be understood that in the embodiment of the present application, the battery cell 210 corresponding to the voltage collected by the first control unit 230 at the last moment may be the same as or different from the battery cell 210 corresponding to the voltage collected at the current moment. For example, the battery device 200 includes a battery cell 210_1, a battery cell 210_2, ... a battery cell 210_N, and at the last moment, the first control unit 230 collects the voltages of the battery cells 210_1 and 210_2, and at the current moment, the first control unit 230 collects the voltages of the battery cells 210_N-1 and 210_N.

[0075] According to this technical solution, when there are multiple battery cells 210, the first control unit 230 collects the voltage of some battery cells 210 among the multiple battery cells 210. This not only simplifies the connection between the first control unit 230 and the battery cells 210, but also reduces the amount of battery cell voltage 210 collected by the first control unit 230, thereby reducing the amount of calculation of the first control unit 230 and improving the operational efficiency of the first control unit 230.

[0076] Alternatively, the first control unit 230 may be specifically configured to collect voltages of all battery cells 210 among the plurality of battery cells 210 , and control the on-off device 220 to disconnect the battery cell 210 when the voltage of at least one battery cell 210 among all the battery cells 210 reaches a voltage threshold.

[0077] In some embodiments, the first control unit 230 may be specifically configured to: when the voltage of the battery cell 210 reaches the voltage threshold, send first control information to the on-off device 220, and the first control information is used to control the on-off device 220 to disconnect from the battery cell 210. In this case, the on-off device 220 may also be configured to: disconnect from the battery cell 210 in response to the first control information sent by the first control unit 230.

[0078] Optionally, the first control unit 230 and the on-off device 220 can communicate in a wired or wireless manner. The wired communication method may include, for example, a CAN communication bus and a daisy chain communication bus. The wireless communication method may include, for example, Bluetooth communication, wireless fidelity (Wireless Fidelity, WIFI) communication, ZigBee communication, and other various methods, which are not limited here.

[0079] If the first control unit 230 and the on-off device 220 communicate via wired communication. As an example, Figure 4 As shown, two communication lines 221a and 221b may be provided between the on-off device 220 and the first control unit 230, and the first control unit 230 sends the first control information to the on-off device 220 through the two communication lines 221a and 221b, and the on-off device 220 receives the first control information through the two communication lines 221a and 221b.

[0080] In this way, a loop can be formed between the switching device 220 and the first control unit 230 through the two communication lines 221 a and 221 b, so that the first control unit 230 and the switching device 220 can communicate better.

[0081] Alternatively, only one communication line may be provided between the first control unit 230 and the switching device 220 .

[0082] In the above technical solution, when the voltage of the battery cell 210 reaches the voltage threshold, the first control unit 230 sends the first control information to the on-off device 220 to control the on-off device 220 to disconnect the battery cell 210, so that when the voltage of the battery cell 210 becomes abnormal, the on-off device 220 can perform protection more quickly and disconnect the circuit, thereby minimizing the possibility of safety accidents caused by excessive voltage of the battery cell 210.

[0083] Furthermore, after the on-off device 220 disconnects from the battery cell 210 , ie, cuts off the circuit, the on-off device 220 may also send response information to the first control unit 230 , where the response information is used to report that the connection with the battery cell 210 has been disconnected.

[0084] In some embodiments, the battery cell 210 can provide power for the first control unit 230 .

[0085] Optionally, in the case where there are multiple battery cells 210, one battery cell 210 among the multiple battery cells 210 can power the first control unit 230, or all battery cells 210 among the multiple battery cells 210 can power the first control unit 230, or still further, some battery cells 210 among the multiple battery cells 210 (such as two battery cells) can power the first control unit 230.

[0086] The battery cell 210 is used to power the first control unit 230, so that the battery device 200 can be self-powered, and the entire battery device 200 can be operated without external voltage input. Furthermore, the battery cell 210 is reused to power the first control unit 230, and there is no need to set up an additional power supply module in the battery device 200, which not only reduces the size of the battery device 200, but also reduces the production cost of the battery device 200.

[0087] As an example, a voltage sampling line is provided between the first control unit 230 and the battery cell 210 , and the first control unit 230 collects the voltage of the battery cell 210 through the voltage sampling line, and the battery cell 210 supplies power to the first control unit 230 through the voltage sampling line.

[0088] Similar to the communication line, the number of the voltage sampling lines may be one or two.

[0089] Reference again Figure 4The first control unit 230 collects the voltage of the battery cell 210_1 through the voltage sampling lines 222a and 222b, and the battery cell 210_1 supplies power to the first control unit 230 through the voltage sampling lines 222a and 222b.

[0090] In this technical solution, the battery cell 210 supplies power to the first control unit 230 via the voltage sampling line, that is, the voltage sampling line is reused to supply power to the first control unit 230, which simplifies the connection between the first control unit 230 and the battery cell 210, not only reducing the internal space of the battery device 200 occupied by the connection between the first control unit 230 and the battery cell 210, but also reducing the connection cost between the first control unit 230 and the battery cell 210.

[0091] As another example, Figure 5 As shown, a sampling interface 231 and a power supply interface 232 are provided on the first control unit 230, and a voltage sampling line and a power supply line are provided between the first control unit 230 and the battery cell 210, the voltage sampling line is connected to the sampling interface, and the power supply line is connected to the power supply interface. The first control unit 230 collects the voltage of the battery cell 210 through the voltage sampling line, and the battery cell 210 supplies power to the first control unit 230 through the power supply line.

[0092] The battery cell 210 connected to the voltage sampling line and the battery cell 210 connected to the power supply line may be the same or different, and this embodiment of the application does not specifically limit this. Figure 5 As shown, voltage sampling lines 222a and 222b are connected to both ends of battery cell 210_1, that is, the first control unit 230 collects the voltage of battery cell 210_1, and power supply lines 223a and 223b are connected to both ends of battery cell 210_1 and battery cell 210_N, that is, all battery cells supply power to the first control unit 230.

[0093] In this technical solution, the circuit for the first control unit 230 to collect the voltage of the battery cell 210 is different from the circuit for the battery cell 210 to supply power to the first control unit 230, so that the collected voltage and the power supply can be controlled separately, which reduces the complexity of control and further reduces the probability of misoperating the collected voltage as the power supply or misoperating the power supply as the collected voltage.

[0094] In other embodiments, Figure 6 As shown, the first control unit 230 may also be connected to a power module 240 outside the battery device 200 , so that the power module 240 supplies power to the first control unit 230 .

[0095] like Figure 6As shown, there may be two power supply lines between the power module 240 and the first control unit 230 .

[0096] As an example, the power module 240 may be a power module of an energy storage system, and the energy storage system includes at least one battery device 200 .

[0097] This technical solution reuses the power module 240 in the energy storage system to supply power to the first control unit 230 , which can reduce the power supply cost for the first control unit 230 .

[0098] As another example, the power module 240 may be a power module 240 independent of the energy storage system. For example, the power module 240 may be a power grid. For another example, the power module 240 may be an independent battery. For another example, the power module 240 may be an independent capacitor.

[0099] In some further embodiments, the power supply in the battery device 200 may supply power to the first control unit 230. For example, an additional power supply in the battery device 200 may supply power to the first control unit 230.

[0100] It should be noted that in the embodiment of the present application, the multiple power supply modes mentioned above can simultaneously power the first control unit 230. For example, while the battery cell 210 powers the first control unit 230, the power module 240 of the energy storage system can also power the first control unit 230.

[0101] Furthermore, in some embodiments, the first control unit 230 may also be used to control the on-off device 220 to disconnect from the battery cell 210 when an abnormality occurs outside the battery device 200 .

[0102] The abnormality occurring outside the battery device 200 may include, but is not limited to: thermal runaway, fire alarm, fire alarm or emergency stop signal occurring outside the battery device 200 .

[0103] The exterior of the battery device 200 may be a part of the energy storage system other than the battery device 200, and / or, the exterior of the battery device 200 may be the exterior of the energy storage system, such as a power grid.

[0104] In the above technical solution, when an abnormality occurs outside the battery device 200, the first control unit 230 controls the on-off device 220 to disconnect the battery cell 210. In this way, when an abnormality occurs outside the battery device 200, the probability that the battery device 200 also becomes abnormal due to the external abnormality is reduced, that is, the possibility of the abnormality spreading is reduced, and the battery device 200 is protected to a certain extent. Furthermore, the diversity of application scenarios of the battery device 200 in the embodiment of the present application is increased, so that it can be applied to more scenarios.

[0105] Optionally, when an abnormality occurs outside the battery device 200 , the external information may trigger the first control unit 230 to control the on-off device 220 so that the on-off device 220 is disconnected from the battery cell 210 .

[0106] Alternatively, if Figure 7 and Figure 8 As shown, the first control unit 230 can be connected to the second control unit 250 of the energy storage system, and the energy storage system includes the battery device 200. At this time, the first control unit 230 can be specifically used to: receive abnormal information sent by the second control unit 250, and the abnormal information is used to indicate that an abnormality occurs outside the battery device 200.

[0107] The first control unit 230 and the second control unit 250 may also communicate with each other in a wired or wireless manner. The wired communication manner may include, for example, a CAN communication bus and a daisy chain communication bus. The wireless communication manner may include, for example, Bluetooth communication, WIFI communication, ZigBee communication, and other various manners.

[0108] The second control unit 250 may be, for example, a battery management system (BMS), such as a SBMU.

[0109] The second control unit 250 may detect the external state of the battery device 200 , and if an abnormality is detected outside the battery device 200 , the abnormality information may be sent to the first control unit 230 .

[0110] The second control unit 250 may detect the external state of the battery device 200 randomly, or may detect the external state of the battery device 200 at each preset time period.

[0111] Alternatively, when an abnormality occurs outside the battery device 200 , the external information may trigger the second control unit 250 by itself, and then the second control unit 250 may send the abnormality information to the first control unit 230 .

[0112] In the above technical solution, the first control unit 230 controls the on-off device 220 to perform a protection action and disconnect the circuit by receiving abnormal information sent by the second control unit 250 to indicate an abnormality outside the battery device 200, so that the on-off device 220 can disconnect the circuit at a faster response speed, thereby minimizing the possibility of abnormalities in the battery device 200 due to external faults.

[0113] In some embodiments, the battery device 200 may include a fuse device, which may include a first control unit 230 and a switching device 220 .

[0114] Alternatively, the fuse device may include only the switching device 220 .

[0115] Furthermore, the fuse device may also include a current monitoring fuse connected in series with the on-off device 220 , and the current monitoring fuse is used to disconnect the battery cell 210 when the current of the battery cell 210 reaches a current threshold.

[0116] In other words, when the current of the battery cell 210 reaches the current threshold, the current monitoring fuse can be blown for protection.

[0117] In this way, when a short circuit occurs in the battery device 200, the current monitoring fuse disconnects from the battery cell 210, i.e., cuts off the circuit, which not only reduces the possibility of a series of unsafe accidents caused by the short circuit, but also increases the diversity of application scenarios of the battery device 200 of the embodiment of the present application, making it applicable to more scenarios.

[0118] It should be understood that the current of the battery cell 210 reaching the current threshold may mean that the current of the battery cell 210 has reached the current threshold or is about to reach the current threshold.

[0119] As an example, the fuse device can be an excitation fuse. For the convenience of description, the current monitoring fuse is referred to as fuse 1, and the on-off device 220 is referred to as fuse 2. The excitation fuse can also include a signal detection fuse, which is connected in series with the excitation fuse 1 and the excitation fuse 2. Excitation fuse 1 includes an ignition tube 1 and an ignition tube 2, and ignition tube 1 and ignition tube 2 are connected in parallel at both ends of the signal detection fuse. When the current of the battery cell 210 reaches the current threshold, when the signal detection fuse is blown, the voltage at both ends becomes larger and is loaded on both ends of the ignition tube 1, thereby triggering the ignition tube 1 to act and cut off the circuit. Excitation fuse 2 includes an ignition tube 3, which is connected to the external signal through a terminal without an intermediate link, and the external signal can directly perform detection and interruption.

[0120] It should be noted that the circuit where the excitation fuse is located can be called a self-triggering circuit. The self-triggering circuit adopts a dual-path parallel connection. For example, the ignition tube adopts a dual ignition tube parallel connection. When any one ignition tube is triggered, the current can be effectively cut off.

[0121] Alternatively, the on / off device 220 may be, for example, a switch or other component with on / off functions.

[0122] As an example, the current monitoring fuse may also be used to disconnect the battery cell 210 when a short circuit occurs in the battery device 200 .

[0123] In this way, when a short circuit occurs in the battery device 200, the current monitoring fuse disconnects from the battery cell 210, i.e., cuts off the circuit, which not only reduces the possibility of a series of unsafe accidents caused by the short circuit, but also increases the diversity of application scenarios of the battery device 200 of the embodiment of the present application, making it applicable to more scenarios.

[0124] Optionally, the current monitoring fuse may be specifically used to spontaneously disconnect the battery cell 210 in response to short circuit information of the battery device 200 .

[0125] That is, the current monitoring fuse can trigger the protection mechanism by itself and cut off the circuit.

[0126] According to this technical solution, when a short circuit occurs in the battery device 200, the current monitoring fuse automatically disconnects from the battery cell 210, thereby reducing the time from the occurrence of a short circuit in the battery device 200 to the current monitoring fuse cutting off the circuit, thereby reducing the possibility of a series of unsafe accidents caused by the short circuit in a shorter period of time.

[0127] In another possible embodiment, when a short circuit occurs in the battery device 200 , the first control unit 230 may send third control information to the on-off device 220 , where the third control information is used to control the on-off device 220 to disconnect from the battery cell 210 .

[0128] The present application also provides an energy storage system. Fig. 9 As shown, the energy storage system 900 includes one or more battery devices 910. Optionally, the battery device 910 may be the battery device 200 in the above embodiment.

[0129] In some embodiments, the energy storage system 900 may further include: a power module connected to the battery device 910 and used to supply power to the first control unit.

[0130] In some embodiments, the energy storage system may further include a second control unit connected to the first control unit. The second control unit is used to detect the external state of the battery device 910, and when an abnormality is detected outside the battery device 910, the second control unit sends abnormal information to the first control unit, and the abnormal information is used to indicate that an abnormality has occurred outside the battery device 910.

[0131] It should be understood that the battery device 910 may refer to the corresponding description in the battery device 200 , and for the sake of brevity, it will not be repeated here.

[0132] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; A switching device connected in series with the battery monomer; The first control unit is used to control the on-off device to disconnect the battery cell when the voltage of the battery cell reaches a voltage threshold.

2. The battery device according to claim 1, characterized in that: The first control unit is specifically used for: When the voltage of the battery cell reaches the voltage threshold, sending first control information to the on-off device, wherein the first control information is used to control the on-off device to disconnect from the battery cell; The on-off device is also used for: In response to the first control information sent by the first control unit, the connection with the battery cell is disconnected.

3. The battery device according to claim 1 or 2, characterized in that: The battery cell supplies power to the first control unit.

4. The battery device according to claim 3, characterized in that: A voltage sampling line is provided between the first control unit and the battery cell, the first control unit collects the voltage of the battery cell through the voltage sampling line, and the battery cell supplies power to the first control unit through the voltage sampling line.

5. The battery device according to claim 3, characterized in that: A sampling interface and a power supply interface are provided on the first control unit, and a voltage sampling line and a power supply line are provided between the first control unit and the battery cell. The voltage sampling line is connected to the sampling interface, and the power supply line is connected to the power supply interface. The first control unit collects the voltage of the battery cell through the voltage sampling line, and the battery cell supplies power to the first control unit through the power supply line.

6. The battery device according to claim 1 or 2, characterized in that: The first control unit is also connected to a power module outside the battery device so that the power module supplies power to the first control unit.

7. The battery device according to claim 6, characterized in that: The power module is a power module of an energy storage system, and the energy storage system includes the battery device.

8. The battery device according to claim 1 or 2, characterized in that: The first control unit is further configured to control the on-off device to disconnect the battery cell when an abnormality occurs outside the battery device.

9. The battery device according to claim 8, characterized in that: The first control unit is connected to a second control unit of an energy storage system, and the energy storage system includes the battery device; The first control unit is specifically used for: receiving abnormal information sent by the second control unit, wherein the abnormal information is used to indicate that an abnormality occurs outside the battery device; In response to the abnormal information, second control information is sent to the on-off device, where the second control information is used to control the on-off device to disconnect from the battery cell.

10. The battery device according to claim 1 or 2, characterized in that: The battery device comprises a fuse device, and the fuse device comprises the first control unit and the switching device.

11. The battery device according to claim 10, characterized in that: The fuse device further comprises a current monitoring fuse connected in series with the on-off device, wherein the current monitoring fuse is used to disconnect the battery cell when the current of the battery cell reaches a current threshold.

12. The battery device according to claim 11, characterized in that: The current monitoring fuse is also used to disconnect the battery cell when a short circuit occurs in the battery device.

13. The battery device according to claim 12, characterized in that: The current monitoring fuse is specifically used for: In response to the short-circuit information of the battery device, the connection with the battery cell is spontaneously disconnected.

14. The battery device according to claim 1 or 2, characterized in that: There are multiple battery cells, and the multiple battery cells are connected in series, parallel or mixed connection, wherein the first control unit is specifically used for: collecting voltages of some battery cells among the plurality of battery cells; When the voltage of at least one battery cell in the part of the battery cells reaches the voltage threshold, the on-off device is controlled to disconnect the battery cell.

15. An energy storage system, characterized in that: include: One or more battery devices as claimed in any one of claims 1 to 14.

16. The energy storage system according to claim 15, characterized in that: The energy storage system further comprises: A power module is connected to the battery device and is used to supply power to the first control unit.

17. The energy storage system according to claim 15, characterized in that: The energy storage system further includes a second control unit, wherein the second control unit is connected to the first control unit; The second control unit is used to detect the external state of the battery device, and when an abnormality is detected outside the battery device, send abnormality information to the first control unit, wherein the abnormality information is used to indicate that an abnormality has occurred outside the battery device.

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