Energy storage system

Abstract

The utility model discloses an energy storage system, which comprises an energy storage power supply device and a plurality of battery packs connected with the energy storage power supply device, the energy storage power supply device is provided with at least two power supply interface units and at least two level control circuits, and each battery pack is respectively provided with a voltage division circuit and two battery interface units connected with each other; each power interface unit comprises a voltage detection interface, and each level control circuit is connected to each voltage detection interface in a one-to-one correspondence manner; each battery interface unit comprises a voltage feedback interface, and the voltage division circuit is connected to two mutually connected voltage feedback interfaces in the battery pack; when each battery interface unit of the battery pack is connected to one of the power interface units of the energy storage power supply equipment, the two voltage feedback interfaces which are connected with each other in the battery pack are connected with the voltage detection interfaces in the corresponding power interface units. According to the utility model, the number of the battery packs respectively connected to each power supply interface unit of the energy storage power supply equipment can be reliably and automatically identified.

Description

Technical Field

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

[0002] With further breakthroughs in technologies such as lithium batteries, energy storage products have experienced rapid development and are being updated and upgraded at an unprecedented pace. Simultaneously, users are placing diverse demands on energy storage products. To achieve longer battery life, there is an increasing demand for scenarios where one energy storage device can power multiple battery packs. This means the need for solutions where one energy storage device supports several battery packs is becoming more varied. Energy storage devices are designed with two charging and discharging interfaces, and battery packs also have two charging and discharging interfaces. During use, there will be multiple ways to connect the energy storage device and the battery pack. For example, one energy storage device might be paired with four battery packs, resulting in two different wiring methods. 5 There are various connection methods, including, for example... Figure 1 , Figure 2 The diagram shows two common wiring methods. First wiring method: Each charge / discharge port of the energy storage power device 10 is divided into four battery packs 20 (specifically, the first battery pack 201, the second battery pack 202, the third battery pack 203, and the fourth battery pack 204). That is, the first battery pack 201 and the second battery pack 202 are connected to one of the interfaces of the energy storage power device 10, and the third battery pack 203 and the fourth battery pack 204 are connected to the other interface of the energy storage power device 10. Second wiring method: The four battery packs (including the first battery pack 201, the second battery pack 202, the third battery pack 203, and the fourth battery pack 204) are connected in a daisy-chain configuration, meaning that the first battery pack 201, the second battery pack 202, the third battery pack 203, and the fourth battery pack 204 are all connected to the same interface of the energy storage power device 10. In the first wiring method, the two interfaces of the energy storage power device 10 have a balanced number of battery packs, enabling the energy storage power device 10 to operate reliably and at full power. However, in the second wiring method, since only one interface of the energy storage power device 10 supports four battery packs, the energy storage power device 10 cannot output full power, or the connecting wires are prone to overload, posing a safety hazard. Existing energy storage power devices cannot identify how the battery packs are connected to them.

[0003] To ensure reliable, full-power operation of energy storage devices and optimal battery pack utilization, most designers currently employ the following methods to avoid the issue of the energy storage device failing to recognize the battery pack's connection method: 1. Using user manuals to inform users to follow the primary wiring method; 2. Using thicker cables connecting the energy storage device and the battery pack, especially current-carrying power cables, to ensure safe operation at full power. However, method 1, due to its wide user base, cannot guarantee that all users will be aware of this issue, posing a safety hazard. While method 2 avoids safety hazards, the cost of the connecting cables is high, and the battery pack requires four connecting wires to connect to the energy storage device. This is particularly problematic for low-voltage battery packs, where cable losses are significant. Therefore, the primary wiring method is preferred. To implement this method, it is essential to clearly determine the number of battery packs connected to each interface of the energy storage device.

[0004] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes an energy storage system that can reliably and automatically identify the number of battery packs connected to each power interface unit of the energy storage power device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model discloses an energy storage system, including an energy storage power supply device and multiple battery packs for connection to the energy storage power supply device. The energy storage power supply device is provided with at least two power interface units and at least two level control circuits, with each level control circuit corresponding to one of the power interface units. Each battery pack is provided with a voltage divider circuit and two interconnected battery interface units. Each power interface unit includes a voltage detection interface, and each level control circuit is connected to each voltage detection interface in a corresponding manner. Each battery interface unit includes a voltage feedback interface, and the voltage divider circuit is connected to two interconnected voltage feedback interfaces in the battery pack. When each battery interface unit of the battery pack is connected to one of the power interface units of the energy storage power supply device, the two interconnected voltage feedback interfaces in the battery pack are connected to the voltage detection interfaces in the corresponding power interface units.

[0008] Preferably, each of the level control circuits includes a first resistor, the first end of which is connected to the voltage detection interface, and the second end of which is connected to the power supply.

[0009] Preferably, the resistance of the first resistor is greater than 1000Ω.

[0010] Preferably, the voltage divider circuit includes a voltage divider resistor, the first end of which is connected to the voltage feedback interface, and the second end of which is connected to the battery pack control terminal.

[0011] Preferably, the resistance of the voltage divider resistor is greater than 1000Ω.

[0012] Preferably, each of the battery packs further includes a battery switch transistor, the first end of which is connected to the first end of the voltage divider resistor, the second end of which is grounded, and the control terminal of which is connected to the control terminal of the battery pack.

[0013] Preferably, the energy storage power device includes a relay, the relay having a common terminal and at least two connection terminals, the common terminal being used to connect to a voltage sampling circuit, and each of the connection terminals being connected to each of the voltage detection interfaces in a corresponding manner.

[0014] Preferably, the relay further includes a coil and a first switching transistor, a first end of the coil is connected to a power supply terminal, a second end of the coil is connected to a first end of the first switching transistor, a second end of the first switching transistor is grounded, and a control terminal of the first switching transistor is connected to a relay control terminal.

[0015] Preferably, the two interconnected battery interface units in each battery pack are a first battery interface unit and a second battery interface unit, respectively. The first battery interface unit is connected to one of the power interface units or the second battery interface unit of another battery pack, and the second battery interface unit is used to connect to the first battery interface unit of another battery pack.

[0016] Preferably, each of the power interface units includes a first current-carrying interface group and a first signal interface group, and each of the battery interface units includes a second current-carrying interface group and a second signal interface group; when each of the battery interface units of the battery pack is connected to one of the power interface units of the energy storage power device, the two interconnected second current-carrying interface groups in the battery pack are connected to the first current-carrying interface group in the corresponding power interface unit, and the two interconnected second signal interface groups in the battery pack are connected to the first signal interface group in the corresponding power interface unit.

[0017] Preferably, the first signal interface group includes a first power interface, a first ground interface, a first communication interface, and the voltage detection interface; the second signal interface group includes a second power interface, a second ground interface, a second communication interface, and the voltage feedback interface; the first ground interface and the second ground interface are grounded; when each of the battery interface units of the battery pack is connected to one of the power interface units of the energy storage power device, two interconnected second power interfaces in the battery pack are connected to the first power interface in the corresponding power interface unit, and two interconnected second communication interfaces in the battery pack are connected to the first communication interface in the corresponding power interface unit.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: The energy storage system proposed by this utility model includes a voltage detection interface and a level control circuit connected thereto in each power interface unit of the energy storage power device, and a voltage feedback interface and a voltage divider circuit connected thereto in the battery interface unit of the battery pack. This allows the number of battery packs connected to the corresponding power interface unit to be obtained by directly sampling the voltage of the voltage detection interface of each power interface unit. Thus, the number of battery packs can be automatically identified by each power interface unit of the energy storage power device without relying on communication between the energy storage power device and the battery pack. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first wiring method of an energy storage power device with four battery packs in the background technology;

[0020] Figure 2 This is a schematic diagram of a second wiring method for an energy storage power device with four battery packs in the background technology;

[0021] Figure 3 This is a wiring diagram of one energy storage power device with four battery packs in a preferred embodiment of the energy storage system of this utility model;

[0022] Figure 4 yes Figure 3 Enlarged schematic diagram of the wiring structure of the energy storage power equipment;

[0023] Figure 5 yes Figure 3 An enlarged schematic diagram of the wiring structure of the first and second battery packs in the diagram;

[0024] Figure 6 yes Figure 3 An enlarged schematic diagram of the wiring structure of the third and fourth battery packs in the diagram;

[0025] Figure 7This is a flowchart illustrating the automatic identification of the number of connected battery packs by each power interface unit in the energy storage power supply device according to a preferred embodiment of this utility model. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0027] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for both fixing and circuit / signal connectivity.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] To ensure the reliable operation of energy storage devices and the full utilization of battery packs, it is desirable to have... Figure 1 The wiring result of the first wiring method shown is that the energy storage power device needs to be able to identify how the battery pack is connected. The advantages of the first wiring method are: (1) the current carrying capacity of the cables connected to interface A and interface B of the energy storage power device is greater than the current carrying capacity required when the energy storage power device is fully loaded; (2) the distance from the last battery pack to the energy storage power device is shortened, and the loss of the current carrying line is low. However, in actual use, since the product involves a wide range of users, it is often difficult for all of them to operate according to the first wiring method. Therefore, the energy storage power device and the battery pack need to automatically identify the wiring method.

[0031] In order to allow the connection method between the energy storage power supply device and the battery pack to be adjusted according to the actual situation under any circumstances, this utility model embodiment proposes a specific wiring structure for the energy storage power supply device and the battery pack of the energy storage system, as well as a corresponding identification method.

[0032] like Figure 3 As shown, a preferred embodiment of this utility model discloses an energy storage system, including an energy storage power supply device 10 and multiple battery packs 20 for connection to the energy storage power supply device 10. The energy storage power supply device 10 is provided with at least two power interface units and at least two level control circuits, with each level control circuit corresponding to one of the power interface units. Each battery pack 20 is provided with a voltage divider circuit and two interconnected battery interface units. Each power interface unit includes a voltage detection interface, and each level control circuit is connected to each voltage detection interface in a corresponding manner. Each battery interface unit includes a voltage feedback interface, and the voltage divider circuit is connected to two interconnected voltage feedback interfaces in the battery pack. When each battery interface unit of the battery pack is connected to one of the power interface units of the energy storage power supply device, the two interconnected voltage feedback interfaces in the battery pack are connected to the voltage detection interfaces in the corresponding power interface units.

[0033] In this embodiment, the energy storage power device 10 supports parallel input of multiple battery packs 20 and is equipped with two power interface units and two level control circuits. Specifically, the two power interface units are a first power interface unit 11 and a second power interface unit 12. The level control circuit connected to the voltage detection interface in the first power interface unit 11 includes a first resistor R. A The level control circuit connected to the voltage detection interface in the second power interface unit 12 includes a second resistor R. B First resistor R A Second resistor R B The first end is respectively connected to the voltage detection interface in the first power interface unit 11 and the second power interface unit 12, and the first resistor R A Second resistor R B The second terminal is connected to the power supply terminal VCC. The first resistor R... A Second resistor R B The resistance values ​​are all greater than 1000Ω, for example, all are several thousand ohms or more. In a specific embodiment, the first resistor R A Second resistor R B Pull-up resistors are used in all cases.

[0034] To ensure reliable and stable connection of the battery pack to the energy storage power device 10, combined with Figure 4The first power interface unit 11 includes an A current-carrying interface 111 and an A interface 112 (the A interface 112 includes a communication interface, a power interface, a ground interface, and a voltage detection interface). The A current-carrying interface 111 has pins 1 and 2 (pin 1 is connected to BAT+, and pin 2 is connected to BAT-). The A interface 112 has pins 1, 2, 3, 4, and 5. Pin 1 of the A interface 112 is the VCC power supply pin, pin 2 is the voltage detection pin ADC_V1, pin 3 is grounded, and pins 4 and 5 are CAN communication pins (pin 4 corresponds to the CAN_H pin, and pin 5 corresponds to the CAN_L pin). The second current interface unit 12 includes a B current-carrying interface 121 and a B interface 122 (the B interface 122 includes a communication interface, a power interface, a ground interface, and a voltage detection interface). The B current-carrying interface 121 has pins 1 and 2 (pin 1 is connected to BAT+, and pin 2 is connected to BAT-). The B interface 122 has pins 1, 2, 3, 4, and 5. Pin 1 of the B interface 122 is the VCC power supply pin, pin 2 is the voltage detection pin ADC_V2, pin 3 is grounded, and pins 4 and 5 are CAN communication pins (pin 4 corresponds to the CAN_H pin, and pin 5 corresponds to the CAN_L pin).

[0035] The energy storage power supply device 10 also includes a relay 13. The relay 13 has a common terminal and two connection terminals. The common terminal is used to connect to the voltage sampling circuit ADC_V. The two connection terminals are respectively connected to the voltage detection interfaces in the first power interface unit 11 and the second current interface 12 (i.e., one connection terminal is connected to pin 2 of interface A 112, and the other connection terminal is connected to pin 2 of interface B 122). The relay 13 also includes a coil L and a first switching transistor Q. A The first end of coil L is connected to the power supply terminal VCC, and the second end of coil L is connected to the first switching transistor Q. A The first terminal, the first switching transistor Q A The second terminal is grounded, and the first switch Q A The control terminal is connected to the relay control terminal RLY_V. By configuring relay 13, voltage detection of two voltage detection ports can be achieved using only one I / O interface, thus saving the need for an additional I / O interface. The first switching transistor Q... A Transistors are used, specifically N-type or P-type transistors.

[0036] In this embodiment, four battery packs 20 are connected to the energy storage power device 10, namely a first battery pack 201, a second battery pack 202, a third battery pack 203, and a fourth battery pack 204. To achieve parallel connection of the multiple battery packs 20 and reliable and stable access to the energy storage power device 10, as follows... Figure 5As shown, the first battery pack 201 includes a voltage divider circuit, a first battery interface unit 21, and a second battery interface unit 22. The first battery interface unit 21 includes a C current-carrying interface 211 and a B interface 212 (the C interface 212 includes a communication interface, a power interface, a ground interface, and a voltage feedback interface). The C current-carrying interface 211 has pins 1 and 2 (pin 1 is connected to BAT+, and pin 2 is connected to BAT-). The C interface 212 has pins 1, 2, 3, 4, and 5. Pin 1 of the C interface 212 is the VCC power supply pin, pin 2 is the voltage feedback pin, pin 3 is grounded, and pins 4 and 5 are CAN communication pins (pin 4 corresponds to the CAN_H pin, and pin 5 corresponds to the CAN_L pin). The second battery interface unit 22 includes a D current-carrying interface 221 and a D interface 222 (the D interface 222 includes a communication interface, a power interface, a ground interface, and a voltage feedback interface). The D current-carrying interface 221 has pins 1 and 2 (pin 1 corresponds to BAT+, pin 2 corresponds to BAT-), and the D interface 222 has pins 1, 2, 3, 4, and 5. Pin 1 of the D interface 222 is the VCC power supply pin, pin 2 is the voltage feedback pin, pin 3 is grounded, and pins 4 and 5 are CAN communication pins (pin 4 corresponds to CAN_H, pin 5 corresponds to CAN_L). The voltage divider circuit includes a voltage divider resistor R1. The first end of the voltage divider resistor R1 is connected to the voltage feedback interface, and the second end of the voltage divider resistor R1 is connected to the battery pack control terminal BMS_KEY1. Combined with... Figure 6 The wiring structures of the second battery pack 202, the third battery pack 203, and the fourth battery pack 204 are the same as those of the first battery pack 201, and will not be described again here. Additionally, the voltage divider circuit in each battery pack 20 includes a voltage divider resistor R. X The battery pack control terminal is BMS_KEY. X The subscript X corresponds to the battery pack number. For example, in this embodiment, the number of battery packs is 4, so X takes the values ​​1, 2, 3, and 4. Correspondingly, the voltage divider circuit in the first battery pack 201 includes a voltage divider resistor R1, the second end of which is connected to the battery pack control terminal BMS_KEY1; the voltage divider circuit in the second battery pack 202 includes a voltage divider resistor R2, the second end of which is connected to the battery pack control terminal BMS_KEY2; the voltage divider circuit in the third battery pack 203 includes a voltage divider resistor R3, the second end of which is connected to the battery pack control terminal BMS_KEY3; and the voltage divider circuit in the fourth battery pack 204 includes a voltage divider resistor R4, the second end of which is connected to the battery pack control terminal BMS_KEY4. Each voltage divider resistor R... X The resistance values ​​of all components are greater than 1000Ω, for example, all are several thousand ohms or more; and the resistance values ​​of the voltage divider resistors in each battery pack are all equal. In this embodiment, R1 = R2 = R3 = R4.

[0037] Furthermore, each battery pack 20 also includes a battery switching transistor Q. X Battery switching transistor QX The first terminal is connected to a voltage divider resistor R. X The first terminal, battery switch Q X The second terminal is grounded, and the battery switch transistor Q... X The control terminal is connected to the battery pack control terminal BMS_KEY. X In this embodiment, the first battery pack 201 includes a battery switch Q1, the first end of which is connected to the first end of a voltage divider resistor R1, the second end of which is grounded, and the control terminal of which is connected to the battery pack control terminal BMS_KEY1; the second battery pack 202 includes a battery switch Q2, the first end of which is connected to the first end of a voltage divider resistor R2, the second end of which is grounded, and the control terminal of which is connected to the battery pack control terminal BMS_KEY2; the third battery pack 203 includes a battery switch Q3, the first end of which is connected to the first end of a voltage divider resistor R3, the second end of which is grounded, and the control terminal of which is connected to the battery pack control terminal BMS_KEY3; the fourth battery pack 204 includes a battery switch Q4, the first end of which is connected to the first end of a voltage divider resistor R4, the second end of which is grounded, and the control terminal of which is connected to the battery pack control terminal BMS_KEY4. Each battery switch Q1... X Transistors are used, specifically N-type or P-type transistors.

[0038] The above-mentioned energy storage system uses a parallel voltage divider method to determine the number of battery packs 20 connected to each power interface unit based on the sampled voltage value. This allows for reliable automatic identification of the number of battery packs 20 connected to each power interface unit in the energy storage power device 10 without relying on communication between the energy storage power device and the battery packs.

[0039] like Figure 7 The diagram shows a flowchart illustrating the automatic identification of the number of connected battery packs 20 by each power interface unit in the energy storage power supply device 10 according to a preferred embodiment of this utility model. S1: After receiving a power-on command (button activation, PV activation, AC activation), the auxiliary power supply of each battery pack 20 starts working, and the C current-carrying interface 211 of each battery pack outputs the battery voltage. The auxiliary power supply of the energy storage power supply device 10 starts working after being powered on. S2: Initialization is performed after the main control systems of the energy storage power supply device 10 and the battery packs 20 are powered on. S3: After initialization is completed, the battery packs 20 enable BMS_KEY. X Signals, such as Figure 3 Each battery switch transistor Q in X (Including Q1, Q2, Q3, Q4) are turned on, and each voltage divider resistor R X(Including R1, R2, R3, and R4) are respectively connected to the voltage divider circuits of ADC_V1 / ADC_V2. The voltage value obtained after voltage division at the power supply terminal VCC will be different depending on the number of resistors connected in parallel at the ADC_V1 / ADC_V2 nodes. A battery switching transistor Q is designed in each battery pack. X and a voltage divider resistor R X With BMS_KEY X After the signal is enabled, the number of resistors connected in parallel will also be different, and the voltage values ​​of ADC_V1 / ADC_V2 obtained by voltage division will be different.

[0040] S4: After the energy storage power device 10 is initialized, after a certain delay, ensure that BMS_KEY is enabled. X Valid; S5: The voltage sampling circuit ADC_V starts sampling the voltage value. During the first time period, pins 3 and 4 of the relay are connected. The sampled voltage value is the voltage value of the voltage detection pin ADC_V1 of the first power interface unit 11. The specific voltage value is VCC*R. X / (N*R A +R X Based on this voltage value, the number N of battery packs connected to the first power interface unit 11 can be obtained; S6: Entering the second time period, the energy storage power device 10 enables the RLY_V signal, the coil L is turned on, and the relay switches to the connection between pins 3 and 5; S7: The sampled voltage value is the voltage value of the voltage detection pin ADC_V2 of the second power interface unit 12, specifically VCC*R X / (N*R B +R X Based on this voltage value, the number N of battery packs connected to the second power interface unit 12 can be obtained. S8: After confirming the number of battery packs connected to each power interface unit, the energy storage power device is ready; during operation, steps S5 to S8 can be continuously operated to confirm the number of battery packs; S9: Self-test ends. A table showing the one-to-one correspondence between voltage values ​​and the number of battery packs can be generated based on the above voltage value formula. After the energy storage power device samples the corresponding voltage value, the number of battery packs can be identified by looking up the table. The workflow is simple and reliable.

[0041] The delay after the energy storage power device initialization is due to the fact that the power-on times of the auxiliary power supply of the energy storage power device 10 and the battery pack 20 are not the same. The delay is to ensure that the reading of the ADC_V1 / ADC_V2 voltage values ​​occurs when the battery pack enables BMS_KEY. X Execution follows the signal. The first resistor R in the energy storage power supply device 10. A Second resistor R B and the voltage divider resistor R in battery pack 20X The resistance values ​​are all above several thousand ohms, the power consumption is negligible, and the RLY_V signal and BMS_KEY are enabled. X The signal remains effective throughout continuous operation of the device, allowing the energy storage power supply device 10 to continuously monitor the online status of the battery pack 20 and achieve real-time monitoring of the number of battery packs 20. Therefore, the energy storage system disclosed in the preferred embodiment of this utility model not only identifies the number of battery packs upon power-up, but also enables the energy storage power supply device and battery packs to monitor the online status of the number of battery packs during operation.

[0042] The background section of this utility model may include background information about the problems or circumstances surrounding the present utility model, rather than a description of prior art by others. Therefore, the content included in the background section is not an admission of prior art by the applicant.

[0043] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope defined by the appended claims.

Claims

1. An energy storage system, characterized in that, The device includes an energy storage power supply device and multiple battery packs for connecting to the energy storage power supply device. The energy storage power supply device is provided with at least two power interface units and at least two level control circuits. The level control circuits correspond one-to-one with the power interface units. Each battery pack is provided with a voltage divider circuit and two battery interface units connected to each other. Each of the power interface units includes a voltage detection interface, and each of the level control circuits is connected to each of the voltage detection interfaces in a corresponding manner; each of the battery interface units includes a voltage feedback interface, and the voltage divider circuit is connected to two interconnected voltage feedback interfaces in the battery pack. Specifically, when each of the battery interface units of the battery pack is connected to one of the power interface units of the energy storage power device, the two interconnected voltage feedback interfaces in the battery pack are connected to the voltage detection interface in the corresponding power interface unit.

2. The energy storage system according to claim 1, characterized in that, Each of the level control circuits includes a first resistor, the first end of which is connected to the voltage detection interface, and the second end of which is connected to the power supply.

3. The energy storage system according to claim 2, characterized in that, The resistance of the first resistor is greater than 1000Ω.

4. The energy storage system according to claim 1, characterized in that, The voltage divider circuit includes a voltage divider resistor, the first end of which is connected to the voltage feedback interface, and the second end of which is connected to the battery pack control terminal.

5. The energy storage system according to claim 4, characterized in that, The resistance of the voltage divider resistor is greater than 1000Ω.

6. The energy storage system according to claim 4, characterized in that, Each of the battery packs further includes a battery switch transistor, the first end of which is connected to the first end of the voltage divider resistor, the second end of which is grounded, and the control end of which is connected to the control end of the battery pack.

7. The energy storage system according to claim 1, characterized in that, The energy storage power device includes a relay, which has a common terminal and at least two connection terminals. The common terminal is used to connect to a voltage sampling circuit, and each connection terminal is connected to each voltage detection interface in a corresponding manner.

8. The energy storage system according to claim 7, characterized in that, The relay further includes a coil and a first switching transistor. The first end of the coil is connected to a power supply terminal, the second end of the coil is connected to the first end of the first switching transistor, the second end of the first switching transistor is grounded, and the control terminal of the first switching transistor is connected to the control terminal of the relay.

9. The energy storage system according to claim 1, characterized in that, The two interconnected battery interface units in each battery pack are a first battery interface unit and a second battery interface unit. The first battery interface unit is connected to one of the power interface units or the second battery interface unit of another battery pack, and the second battery interface unit is used to connect to the first battery interface unit of another battery pack.

10. The energy storage system according to claim 1, characterized in that, Each of the power interface units includes a first current-carrying interface group and a first signal interface group, and each of the battery interface units includes a second current-carrying interface group and a second signal interface group. When each of the battery interface units of the battery pack is connected to one of the power interface units of the energy storage power device, the two interconnected second current-carrying interface groups in the battery pack are connected to the first current-carrying interface group in the corresponding power interface unit, and the two interconnected second signal interface groups in the battery pack are connected to the first signal interface group in the corresponding power interface unit.

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