An energy storage system

Abstract

The utility model discloses a kind of energy storage systems, it is related to the technical field of battery heating, and energy storage system includes at least two battery modules, and at least two battery modules form total voltage output positive end and total voltage output negative end after being connected in series;Heating circuit, heating circuit is formed by the heater in each battery module in series, and the two ends of heating circuit are connected with total voltage output positive end and total voltage output negative end respectively, and heating circuit is used to heat the battery in each battery module.The utility model can be simply and low-costly to realize the efficient heating of battery, and avoid unnecessary energy loss in heating process to some extent.

Description

Technical Field

[0001] This utility model relates to the field of battery cell heating technology, and in particular to an energy storage system. Background Technology

[0002] With the rapid development of the energy storage industry, residential energy storage products are being used more and more widely in various application scenarios. However, the performance of battery cells will significantly decrease in low-temperature environments, and heating films are usually used to heat them back to normal operating temperatures.

[0003] Currently, in the process of using heating films to heat battery cells, it is usually necessary to configure an additional AC power supply to transmit power to the heating films of each battery module, so that the heating films can work normally.

[0004] However, this method requires the configuration of an additional power supply interface, which not only increases the cost but also increases the complexity of the on-site wiring process. Furthermore, the operating power of the heating film will change with the magnitude of the external power supply voltage, which makes it impossible to control the operating power of the heating film, potentially causing unnecessary energy loss or low heating efficiency. Utility Model Content

[0005] The main purpose of this invention is to provide an energy storage system that aims to achieve efficient heating of battery cells in a simple and low-cost manner, and to a certain extent avoid unnecessary energy loss during the heating process.

[0006] To achieve the above objectives, this utility model proposes an energy storage system, comprising: At least two battery modules are connected in series to form a positive terminal and a negative terminal of the total voltage output. A heating circuit is provided, which is formed by connecting heating devices in each of the battery modules in series. The two ends of the heating circuit are respectively connected to the positive terminal of the total voltage output and the negative terminal of the total voltage output. The heating circuit is used to heat the cells in each of the battery modules.

[0007] In one embodiment, the energy storage system further includes a switch box and a base; the base, at least two battery modules, and the switch box are stacked sequentially from bottom to top.

[0008] In one embodiment, the energy storage system further includes: A plurality of stacked connectors are disposed on the battery module, and the heating devices in each battery module are electrically connected in series through the stacked connectors to form the heating circuit.

[0009] In one embodiment, the energy storage system further includes: At least one first circuit breaker is disposed between the first terminal of the heating circuit and the positive terminal of the total voltage output or between the second terminal of the heating circuit and the negative terminal of the total voltage output; The main control module controls the first circuit breaker to open or close based on the electrical parameters of the heating circuit; the electrical parameters of the heating circuit include voltage and / or current.

[0010] In one embodiment, the main control module includes: The first sampling unit has its sampling terminal connected to the heating circuit and is used to collect the electrical parameters of the heating circuit. The first control unit has its input terminal connected to the output terminal of the first sampling unit and its output terminal connected to the control terminal of the first circuit breaker. It is used to receive the electrical parameters of the heating circuit and compare the electrical parameters of the heating circuit with the magnitude of a first preset electrical parameter threshold, so as to output a switch control signal to the first circuit breaker to control the first circuit breaker to open or close.

[0011] In one embodiment, the energy storage system further includes: At least one second circuit breaker is provided between the battery module and the positive terminal of the total voltage output or between the battery module and the negative terminal of the total voltage output; The main control module controls the second circuit breaker to open or close based on the electrical parameters of the battery module; the electrical parameters of the battery module include voltage and / or current.

[0012] In one embodiment, the main control module further includes: The second sampling unit has its sampling terminal connected to the battery module and is used to collect the electrical parameters of the battery module. The second control unit has its input terminal connected to the output terminal of the second sampling unit and its output terminal connected to the control terminal of the second circuit breaker. It is used to receive the electrical parameters of the battery module and compare the electrical parameters of the battery module with the magnitude of a second preset electrical parameter threshold, so as to output a switch control signal to the second circuit breaker to control the second circuit breaker to open or close.

[0013] In one embodiment, the energy storage system further includes: At least two resistors, one of which is connected in parallel to each of the heating devices, wherein the resistance of the resistor is greater than the resistance of the heating device; The main control module identifies the status of each heating device based on the voltage across each resistor.

[0014] In one embodiment, the battery module includes: A voltage sampling circuit, wherein the sampling terminal of the voltage sampling circuit is connected to both ends of the resistor, for collecting the voltage across the resistor; A battery management unit, the input of which is connected to the output of the voltage sampling circuit, and the output of which is connected to the input of the main control module, the battery management unit being used to send the voltage across the resistor to the main control module.

[0015] In one embodiment, the main control module further includes: A comparison unit is provided, the input of which is connected to the output of the battery management unit. The comparison unit is used to compare the voltage across each resistor with a preset open-circuit voltage threshold and a preset short-circuit voltage threshold to identify the state of each heating device.

[0016] This utility model provides an energy storage system, including: at least two battery modules, which are connected in series to form a positive terminal and a negative terminal for total voltage output; a heating circuit, which is formed by connecting heating devices in each battery module in series, with the two ends of the heating circuit connected to the positive terminal and the negative terminal for total voltage output respectively, and the heating circuit is used to heat the cells in each battery module.

[0017] Therefore, the technical solution provided by this utility model directly connects the heating circuit formed by the heating devices in each battery module connected in series to the positive and negative terminals of the total voltage output formed by the series connection of each battery module. This utilizes the internal total output voltage to power the heating devices, eliminating the need for external power supply. This not only simplifies circuit design and on-site operation but also effectively reduces costs. Furthermore, since the heating devices in each battery module are connected in series, the current flowing through each heating device is the same, and the voltage across each heating device can be automatically evenly distributed based on its resistance value. This ensures that the voltage of the heating devices in each battery module remains essentially consistent, thereby enabling precise control of the heating device's operating power. This helps to avoid unnecessary energy loss during heating and ensures heating efficiency.

[0018] In summary, the technical solution provided by this utility model can achieve efficient heating of the battery cell in a simple and low-cost manner, and to a certain extent avoid unnecessary energy loss during the heating process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a first structural schematic diagram of the energy storage system provided in the first embodiment of the present invention; Figure 2 This is a second structural schematic diagram of the energy storage system provided in the first embodiment of the present invention; Figure 3 This is a third structural schematic diagram of the energy storage system provided in the second embodiment of the present invention; Figure 4 This is a fourth structural schematic diagram of the energy storage system provided in the second embodiment of the present invention; Figure 5 This is a fifth structural schematic diagram of the energy storage system provided in the second embodiment of the present invention; Figure 6 A sixth structural schematic diagram of the energy storage system provided in the third embodiment of this utility model; Figure 7 A seventh structural schematic diagram of the energy storage system provided in the third embodiment of this utility model; Figure 8 This is an eighth structural schematic diagram of the energy storage system provided in the fourth embodiment of the present invention; Figure 9 The ninth structural schematic diagram of the energy storage system provided in the fourth embodiment of this utility model.

[0021] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0022] Explanation of icon numbers: 10. Heating circuit; 20. Main control module; 30. Voltage sampling circuit; 40. Battery management unit; 21. First sampling unit; 22. First control unit; 23. Second sampling unit; 24. Second control unit; 25. Comparison unit; A1~An, Battery module; Rx, Heating device; P+, Positive terminal of total voltage output; P-, Negative terminal of total voltage output; B1, Stacking connector; K1, First circuit breaker; K2, Second circuit breaker. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0026] With the rapid development of the energy storage industry, residential energy storage products are being used more and more widely in various application scenarios. However, the performance of battery cells will significantly decrease in low-temperature environments, and heating films are usually used to heat them back to normal operating temperatures.

[0027] Currently, in the process of using heating films to heat battery cells, it is usually necessary to configure an additional AC power supply to transmit power to the heating films of each battery module, so that the heating films can work normally.

[0028] However, this method requires the configuration of an additional power supply interface, which not only increases the cost but also increases the complexity of the on-site wiring process. Furthermore, the operating power of the heating film will change with the magnitude of the external power supply voltage, which makes it impossible to control the operating power of the heating film, potentially causing unnecessary energy loss or low heating efficiency.

[0029] Based on this, the present invention provides an energy storage system. In the first embodiment of the present invention, please refer to... Figure 1 The energy storage system includes: At least two battery modules are connected in series to form the positive terminal P+ and the negative terminal P- of the total voltage output; Heating circuit 10 is formed by connecting heating devices Rx in each battery module in series. The two ends of heating circuit 10 are connected to the positive terminal P+ and the negative terminal P- of the total voltage output, respectively. Heating circuit 10 is used to heat the cells in each battery module.

[0030] It should be noted that a battery module is a packaged battery unit, which includes at least a battery cell, a heating element Rx, and a battery management unit (BMU). The heating element Rx can be a heating film or other devices with heating functions, etc., and this embodiment does not specifically limit it. The heating film is a thin film tightly attached to the surface of the battery cell, which heats up when energized, thereby heating the battery cell. The positive and negative terminals of the total voltage output can be formed by connecting the battery cells in each battery module in series or in parallel. For the case where the positive and negative terminals of the total voltage output are formed by connecting the battery cells in each battery module in series, please refer to... Figure 1 The positive terminal of the first battery module is the positive terminal P+ of the total voltage output, and the negative terminal of the last battery module is the negative terminal P- of the total voltage output.

[0031] In one feasible implementation, please refer to Figure 2 Energy storage systems may also include: Several stacked connectors B1 are provided on the battery module. The heating devices Rx in each battery module are electrically connected in series through each stacked connector B1 to form a heating circuit 10.

[0032] It should be noted that the stack connector B1 is typically a set of male and female paired conductive terminals (such as pins and sockets), and the set of male and female paired conductive terminals of the stack connector B1 can be integrated onto the housings of two battery modules respectively.

[0033] Understandably, when using the stacking connector B1 to connect the heating elements Rx in each battery module in series, by stacking one battery module on top of another, the corresponding stacking connector B1 can automatically and precisely align and engage to establish an electrical connection between the two battery modules. This eliminates the need for any additional, complex wiring work, greatly simplifying the installation process and reducing installation costs and the risk of errors. Furthermore, using the stacking connector B1 for series connection also ensures the reliability of the electrical connection, thus avoiding problems such as loose connections, poor connection, or excessive contact resistance R1 caused by manual wiring on site.

[0034] In addition to the heating devices Rx in each battery module being connected in series using the stacking connector B1, the battery cells or other components that need to be connected in series in each battery module can also be connected in series using the stacking connector B1.

[0035] This embodiment does not specifically limit the implementation method of connecting the heating devices Rx in each battery module in series. For example, in other feasible embodiments, wires with terminals can also be used to connect the heating devices Rx in each battery module in series.

[0036] As can be seen from the above, the technical solution provided in this embodiment directly connects the heating circuit formed by the heating devices Rx in each battery module connected in series to the positive terminal P+ and the negative terminal P- of the total voltage output formed by the series connection of each battery module. This utilizes the internal total output voltage to power the heating devices Rx, eliminating the need for external power supply. This not only simplifies circuit design and on-site operation but also effectively reduces costs. Furthermore, since the heating devices Rx in each battery module are connected in series, the current flowing through each heating device Rx is the same, and the voltage across each heating device Rx can be automatically evenly distributed based on its resistance value. This ensures that the voltage of the heating devices Rx in each battery module remains essentially consistent. Therefore, precise control of the operating power of the heating devices Rx can be achieved, avoiding unnecessary energy loss during heating and ensuring heating efficiency to a certain extent.

[0037] Therefore, the technical solution provided in this embodiment can achieve efficient heating of the battery cell in a simple and low-cost manner, and avoid unnecessary energy loss during the heating process to a certain extent.

[0038] Based on the first embodiment described above, a second embodiment of the energy storage system of this utility model is proposed. For the second embodiment, please refer to... Figure 3 The energy storage system may also include a switch box and a base; the base, at least two battery modules and the switch box are stacked in sequence from bottom to top.

[0039] It should be noted that when each battery module is equipped with a stacking connector B1, a matching stacking connector B1 can be installed on both the switch box and the base, so that the first battery module can also be connected in series with the switch box through the stacking connector B1, and the last battery module can also be connected in series with the base through the stacking connector B1.

[0040] The energy storage system may also include a main control module 20 located in the switch box.

[0041] It should be noted that the main control module 20 can be a central processing unit (CMU) or an integrated circuit composed of multiple circuit units that perform different functions, etc. This embodiment does not make specific limitations on this.

[0042] Based on this, in one feasible implementation method, please refer to Figure 4 Energy storage systems may also include: At least one first circuit breaker K1 is provided between the first terminal of the heating circuit 10 and the positive terminal P+ of the total voltage output, or between the second terminal of the heating circuit 10 and the negative terminal P- of the total voltage output. The main control module 20 controls the first circuit breaker K1 to open or close according to the electrical parameters of the heating circuit 10; the electrical parameters of the heating circuit 10 include voltage and / or current.

[0043] It should be noted that the first circuit breaker K1 can be a relay, a switching transistor, or other device with closing and opening functions, and this embodiment does not specifically limit it.

[0044] In this embodiment, a first circuit breaker K1 is installed between the first terminal of the heating circuit 10 and the positive terminal P+ of the total voltage output, or between the second terminal of the heating circuit 10 and the negative terminal P- of the total voltage output. The main control module 20 can control the first circuit breaker K1 to open or close according to the actual working conditions of the heating circuit 10, i.e., the electrical parameters of the heating circuit 10, so as to control the heating circuit 10 to enter or exit the working state. Thus, when the heating circuit 10 is abnormal, it can be controlled to exit the working state in a timely manner to achieve circuit protection, thereby further improving the safety and reliability of the energy storage system.

[0045] Furthermore, in one feasible implementation, please refer to Figure 5 The main control module 20 may include: The first sampling unit 21 has its sampling terminal connected to the heating circuit 10 and is used to collect the electrical parameters of the heating circuit 10. The first control unit 22 has its input terminal connected to the output terminal of the first sampling unit 21 and its output terminal connected to the control terminal of the first circuit breaker B1. It is used to receive the electrical parameters of the heating circuit 10 and compare the electrical parameters of the heating circuit 10 with the magnitude of the first preset electrical parameter threshold, so as to output a switch control signal to the first circuit breaker B1 to control the first circuit breaker B1 to open or close.

[0046] It should be noted that the switch control signal can include a switch closing signal and a switch opening signal. After the first circuit breaker B1 is closed, it can control the heating circuit 10 to enter the working state; after the first circuit breaker B1 is opened, it can control the heating circuit 10 to exit the working state.

[0047] In one feasible implementation, the first sampling unit 21 may include a voltage sensor and / or a current sensor, the sampling terminals of the voltage sensor and the current sensor are both connected to the heating circuit 10, and the output terminals of the voltage sensor and the current sensor are both connected to the input terminal of the first control unit 22.

[0048] In one feasible implementation, the first control unit 22 may include a comparator and a controller. The non-inverting input of the comparator is connected to the output of the first sampling unit 21, the inverting input of the comparator is connected to a first preset electrical parameter threshold, the output of the comparator is connected to the input of the controller, and the output of the controller is connected to the control terminal of the first circuit breaker K1. The comparator is used to compare the electrical parameters of the heating circuit 10 with the first preset electrical parameter threshold, and outputs a corresponding level signal to the controller according to the comparison result. When the received level signal is a low level signal, the controller outputs a switch closing signal to the first circuit breaker K1 to trigger the first circuit breaker K1 to close. When the received level signal is a high level signal, the controller outputs a switch opening signal to the first circuit breaker K1 to trigger the first circuit breaker K1 to open.

[0049] In another feasible implementation, the non-inverting input of the comparator can be connected to a first preset electrical parameter threshold, and the inverting input of the comparator can be connected to the output of the first sampling unit 21. Thus, when the received level signal is a high level signal, the controller outputs a switch closing signal to the first circuit breaker K1 to trigger the first circuit breaker K1 to close; when the received level signal is a low level signal, the controller outputs a switch opening signal to the first circuit breaker K1 to trigger the first circuit breaker K1 to open.

[0050] The first preset electrical parameter threshold serves as the basis for determining whether the heating circuit 10 is functioning properly. It can be a default value or can be flexibly set by the user according to actual conditions; this embodiment does not impose specific limitations on this. When the electrical parameters of the heating circuit 10 only include voltage or current, the first control unit 22 only needs to include one comparator; when the electrical parameters of the heating circuit 10 include both voltage and current, the first control unit 22 needs to include two comparators to compare the magnitudes of voltage and current respectively.

[0051] Based on the second embodiment described above, a third embodiment of the energy storage system of this utility model is proposed. In the third embodiment, please refer to... Figure 6 Energy storage systems may also include: At least one second circuit breaker K2 is provided between the battery module and the positive terminal P+ of the total voltage output or between the battery module and the negative terminal P- of the total voltage output; The main control module 20 controls the second circuit breaker K2 to open or close based on the electrical parameters of the battery module; the electrical parameters of the battery module include voltage and / or current.

[0052] It should be noted that the second circuit breaker K2 can be a relay, a switching transistor, or other device with closing and opening functions, etc., and this embodiment does not specifically limit it. When the second circuit breaker K2 is located between the battery module and the positive terminal P+ of the total voltage output, the second circuit breaker K2 is actually located between the first battery module and the positive terminal P+ of the total voltage output; when the second circuit breaker K2 is located between the battery module and the negative terminal P- of the total voltage output, the second circuit breaker K2 is actually located between the last battery module and the negative terminal P- of the total voltage output.

[0053] In one feasible implementation, please refer to Figure 7 The main control module 20 may also include: The second sampling unit 23 has its sampling end connected to the battery module and is used to collect the electrical parameters of the battery module. The second control unit 24 has its input terminal connected to the output terminal of the second sampling unit 23 and its output terminal connected to the control terminal of the second circuit breaker K2. It is used to receive the electrical parameters of the battery module and compare the electrical parameters of the battery module with the second preset electrical parameter threshold to output a switch control signal to the second circuit breaker K2 to control the second circuit breaker K2 to open or close.

[0054] Furthermore, in one feasible implementation, the second sampling unit 23 may include a voltage sensor and / or a current sensor, the sampling terminals of the voltage sensor and the current sensor are both connected to the battery module, and the output terminals of the voltage sensor and the current sensor are both connected to the input terminal of the second control unit 24.

[0055] In one feasible implementation, the second control unit 24 may include a comparator and a controller. The non-inverting input of the comparator is connected to the output of the second sampling unit 23, the inverting input of the comparator is connected to a second preset electrical parameter threshold, the output of the comparator is connected to the input of the controller, and the output of the controller is connected to the control terminal of the second circuit breaker K2. The comparator is used to compare the electrical parameters of the battery module with the second preset electrical parameter threshold, and outputs a corresponding level signal to the controller according to the comparison result. When the received level signal is a low level signal, the controller outputs a switch closing signal to the second circuit breaker K2 to trigger the second circuit breaker K2 to close. When the received level signal is a high level signal, the controller outputs a switch opening signal to the second circuit breaker K2 to trigger the second circuit breaker K2 to open.

[0056] In another feasible implementation, the non-inverting input of the comparator can be connected to a second preset electrical parameter threshold, and the inverting input of the comparator can be connected to the output of the second sampling unit 23. Thus, when the received level signal is a high level signal, the controller outputs a switch closing signal to the second circuit breaker K2 to trigger the second circuit breaker K2 to close; when the received level signal is a low level signal, the controller outputs a switch opening signal to the second circuit breaker K2 to trigger the second circuit breaker K2 to open.

[0057] The second preset electrical parameter threshold serves as the basis for determining whether the battery module is functioning correctly. It can be a default value or can be flexibly set by the user according to actual conditions; this embodiment does not impose specific limitations on this. When the electrical parameters of the battery module only include voltage or current, the second control unit 24 only needs to include one comparator; when the electrical parameters of the battery module include both voltage and current, the second control unit 24 needs to include two comparators to compare the magnitudes of voltage and current respectively.

[0058] As described above, in this embodiment, by setting a second circuit breaker K2 between the battery module and the positive terminal P+ of the total voltage output or between the battery module and the negative terminal P- of the total voltage output, and by controlling the main control module 20 to open or close the second circuit breaker K2 according to the actual working conditions of the battery module, i.e., the electrical parameters of the battery module, the battery module can be controlled to enter and exit the working state. Therefore, when the battery module malfunctions (e.g., a short circuit occurs in the heating device Rx or its connecting lines), it can be promptly controlled to exit the working state to achieve circuit protection, thereby further improving the safety and reliability of the energy storage system.

[0059] Furthermore, the second circuit breaker K2 in this embodiment can be integrated with K1 in the above embodiment, or it can be set independently. This embodiment does not make specific limitations on this.

[0060] Based on the second and / or third embodiments described above, a fourth embodiment of the energy storage system of this utility model is proposed. In the fourth embodiment, please refer to... Figure 8 Energy storage systems may also include: At least two resistors R1 are used, and each heating element Rx is connected in parallel with a resistor R1. The resistance of resistor R1 is greater than the resistance of heating element Rx. The main control module 20 identifies the state of each heating device Rx based on the voltage across each resistor R1.

[0061] It should be noted that the state of the heating device Rx may include, but is not limited to, normal state, open circuit state, and short circuit state, and this embodiment does not make specific limitations on this.

[0062] It is understandable that by setting the resistance of resistor R1 to be greater than the resistance of heating element Rx, the voltage across resistor R1 can accurately reflect the state of heating element Rx. Specifically: For any heating device Rx in a battery module, when the heating device Rx is working normally, the total resistance of the resistor R1 connected in parallel with the heating device Rx is close to the resistance of the heating device Rx. Therefore, the voltage across the resistor R1 is consistent with that of other normal battery modules and the voltage is evenly distributed.

[0063] When the heating element Rx experiences an open-circuit fault, the voltage divider resistance of the battery module becomes the resistance of resistor R1. Consequently, the voltage across resistor R1 will significantly exceed the normal range and be much higher than the voltage values ​​of other normal battery modules. Therefore, the main control module 20 can identify whether the heating element Rx is in an open-circuit state by comparing the voltage across resistor R1 with a preset open-circuit voltage threshold. Specifically, if the voltage across resistor R1 is greater than the preset open-circuit voltage threshold, it can be determined that the heating element Rx is in an open-circuit state.

[0064] When the heating element Rx experiences a short circuit, the voltage across resistor R1 will be zero. Therefore, the main control module 20 can identify whether the heating element Rx is in a short circuit state by comparing the voltage across resistor R1 with a preset short-circuit voltage threshold. Specifically, if the voltage across resistor R1 equals the preset short-circuit voltage threshold, it can be determined that the heating element is in a short circuit state.

[0065] If the voltage across resistor R1 is greater than the preset short-circuit voltage threshold and less than the preset open-circuit voltage threshold, then the heating device Rx is in normal condition.

[0066] In one feasible implementation, please refer to Figure 8 The battery module may include: Voltage sampling circuit 30, the sampling terminal of voltage sampling circuit 30 is connected to both ends of resistor R1, and is used to collect the voltage across resistor R1. The battery management unit 40 has its input terminal connected to the output terminal of the voltage sampling circuit 30, and its output terminal connected to the input terminal of the main control module 20. The battery management unit 40 is used to send the voltage across the resistor R1 to the main control module 20.

[0067] It should be noted that the voltage sampling circuit 30 may include a voltage divider resistor, a voltage sensor, or other devices with voltage sampling function, and this embodiment does not specifically limit it.

[0068] In one feasible implementation, please refer to Figure 9 The main control module 20 may also include: The input terminal of the comparison unit 25 is connected to the output terminal of the battery management unit 40. The comparison unit 25 is used to compare the voltage across each resistor R1 with the preset open-circuit voltage threshold and the preset short-circuit voltage threshold to identify the state of each heating device Rx.

[0069] It should be noted that the preset open-circuit voltage threshold, used as the basis for determining whether the heating device Rx is in an open-circuit state, can be a default value or can be flexibly set by the user according to the actual situation. This embodiment does not impose specific limitations on this. Similarly, the preset short-circuit voltage threshold, used as the basis for determining whether the heating device Rx is in a short-circuit state, can be a default value or can be flexibly set by the user according to the actual situation. This embodiment also does not impose specific limitations on this.

[0070] In one feasible implementation, the main control module 20 can be connected in series with the battery management unit 40 of each battery module via daisy-chain communication. This allows for direct location of the faulty heating device Rx, enabling relevant personnel to quickly repair the fault and further improving the safety and reliability of the energy storage system.

[0071] It should be noted that the daisy-chain communication method is a serial communication topology. After the main control module 20 is connected in series with the battery management unit 40 of each battery module through the daisy-chain communication method, the data can start from the main control module 20, pass through each battery management unit 40 in sequence, until it reaches the last battery management unit 40, and then return along the original path.

[0072] Understandably, by connecting the main control module 20 and the battery management units 40 of each battery module in series through daisy-chain communication, compared to the communication connection method where each battery management unit 40 has to be connected to the main control module 20 with a separate wire, daisy-chain only requires a pair of communication wires to connect all battery management units 40, thereby simplifying wiring and improving the reliability of the energy storage system.

[0073] As described above, this embodiment incorporates a resistor R1 connected in parallel with the heating element Rx in each battery module, with the resistance of R1 greater than that of the heating element Rx. Therefore, the main control module 20 can identify the state of each heating element Rx using the voltage across each resistor R1. This allows for timely feedback of any abnormal state in the heating element Rx, facilitating rapid fault repair and further enhancing the safety and reliability of the energy storage system.

[0074] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An energy storage system, characterized in that, include: At least two battery modules are connected in series to form a positive terminal and a negative terminal of the total voltage output. A heating circuit is provided, which is formed by connecting heating devices in each of the battery modules in series. The two ends of the heating circuit are respectively connected to the positive terminal of the total voltage output and the negative terminal of the total voltage output. The heating circuit is used to heat the cells in each of the battery modules.

2. The energy storage system as described in claim 1, characterized in that, The energy storage system also includes a switch box and a base; the base, at least two battery modules and the switch box are stacked sequentially from bottom to top.

3. The energy storage system as described in claim 1 or 2, characterized in that, The energy storage system also includes: A plurality of stacked connectors are disposed on the battery module, and the heating devices in each battery module are electrically connected in series through the stacked connectors to form the heating circuit.

4. The energy storage system as described in claim 2, characterized in that, The energy storage system also includes: At least one first circuit breaker is disposed between the first terminal of the heating circuit and the positive terminal of the total voltage output or between the second terminal of the heating circuit and the negative terminal of the total voltage output; The main control module controls the first circuit breaker to open or close based on the electrical parameters of the heating circuit; the electrical parameters of the heating circuit include voltage and / or current.

5. The energy storage system as described in claim 4, characterized in that, The main control module includes: The first sampling unit has its sampling terminal connected to the heating circuit and is used to collect the electrical parameters of the heating circuit. The first control unit has its input terminal connected to the output terminal of the first sampling unit and its output terminal connected to the control terminal of the first circuit breaker. It is used to receive the electrical parameters of the heating circuit and compare the electrical parameters of the heating circuit with the magnitude of a first preset electrical parameter threshold, so as to output a switch control signal to the first circuit breaker to control the first circuit breaker to open or close.

6. The energy storage system as described in claim 2, characterized in that, The energy storage system also includes: At least one second circuit breaker is provided between the battery module and the positive terminal of the total voltage output or between the battery module and the negative terminal of the total voltage output; The main control module controls the second circuit breaker to open or close based on the electrical parameters of the battery module; the electrical parameters of the battery module include voltage and / or current.

7. The energy storage system as described in claim 6, characterized in that, The main control module also includes: The second sampling unit has its sampling terminal connected to the battery module and is used to collect the electrical parameters of the battery module. The second control unit has its input terminal connected to the output terminal of the second sampling unit and its output terminal connected to the control terminal of the second circuit breaker. It is used to receive the electrical parameters of the battery module and compare the electrical parameters of the battery module with the magnitude of a second preset electrical parameter threshold, so as to output a switch control signal to the second circuit breaker to control the second circuit breaker to open or close.

8. The energy storage system as described in claim 2, characterized in that, The energy storage system also includes: At least two resistors, one of which is connected in parallel to each of the heating devices, wherein the resistance of the resistor is greater than the resistance of the heating device; The main control module identifies the status of each heating device based on the voltage across each resistor.

9. The energy storage system as described in claim 8, characterized in that, The battery module includes: A voltage sampling circuit, wherein the sampling terminal of the voltage sampling circuit is connected to both ends of the resistor, for collecting the voltage across the resistor; A battery management unit, the input of which is connected to the output of the voltage sampling circuit, and the output of which is connected to the input of the main control module, the battery management unit being used to send the voltage across the resistor to the main control module.

10. The energy storage system as described in claim 9, characterized in that, The main control module also includes: A comparison unit is provided, the input of which is connected to the output of the battery management unit. The comparison unit is used to compare the voltage across each resistor with a preset open-circuit voltage threshold and a preset short-circuit voltage threshold to identify the state of each heating device.

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