A battery system and energy storage device

Abstract

The utility model provides a kind of battery system and energy storage equipment, for power supply to load, including pre-charging circuit, multiple batteries, with the main relay corresponding to the battery quantity, and with the on-off switch corresponding to the battery quantity, the main relay is arranged between the battery and the load;One end of the pre-charging circuit is connected with the load anode, the other end is connected with multiple battery anode respectively through multiple on-off switches, and the on-off switch and the battery one-to-one correspond.The utility model can solve the problem of high cost of existing battery system.

Description

Technical Field

[0001] This utility model relates to the field of battery system technology for high-voltage electrical equipment, and in particular to a battery system and energy storage device. Background Technology

[0002] Most battery systems on the market today include a pre-charging circuit at the output end to pre-charge the capacitors of high-voltage equipment. This balances the voltage of the high-voltage equipment with the battery system voltage, preventing excessive current overload and damage to components during startup due to a large voltage difference. However, existing pre-charging circuits are only suitable for a one-to-one connection between the battery system and the high-voltage equipment. Each branch of the pre-charging circuit is controlled independently, meaning two branches would constitute two pre-charging circuits, leading to higher battery system costs. Utility Model Content

[0003] The purpose of this invention is to provide a battery system and energy storage device to solve the problem of high cost of existing battery systems.

[0004] To solve the above-mentioned technical problems, this utility model provides a battery system for supplying power to a load, including a pre-charging circuit, multiple batteries, a main relay corresponding to the number of batteries, and on / off switches corresponding to the number of batteries. The main relay is disposed between the batteries and the load. One end of the pre-charging circuit is connected to the positive terminal of the load, and the other end is connected to the positive terminals of multiple batteries through multiple on / off switches, and each on / off switch corresponds to one battery.

[0005] Optionally, the main relay includes a first relay and a second relay. The number of first relays corresponds to the number of batteries. One end of the first relay is connected to the positive terminal of the battery, and the other end is connected to the positive terminal of the load. The number of second relays corresponds to the number of batteries. One end of the second relay is connected to the negative terminal of the battery, and the other end is connected to the negative terminal of the load.

[0006] Optionally, the pre-charge circuit includes a pre-charge resistor and a pre-charge relay. One end of the pre-charge relay is connected to the positive terminal of the battery, and the other end is connected to the positive terminal of the load. The pre-charge resistor is disposed between the pre-charge relay and the positive terminal of the load, or between the positive terminal of the battery and the pre-charge relay.

[0007] Optionally, a hybrid switch may also be included, which is disposed between the battery and the load.

[0008] Optionally, the hybrid switch is disposed between the positive terminal of the battery and the positive terminal of the load, and between the negative terminal of the battery and the negative terminal of the load.

[0009] Optionally, a fuse corresponding to the number of batteries may also be included, the fuse being disposed between the positive terminal of the battery and the positive terminal of the load.

[0010] Optionally, a current Hall effect sensor corresponding to the number of batteries is also included to detect the battery charging and discharging current. The current Hall effect sensor is disposed between the positive terminal of the battery and the positive terminal of the load.

[0011] Optionally, the number of batteries is two, and the number of main relays and on / off switches is also two.

[0012] This utility model also provides an energy storage device, including a load and the aforementioned battery system, wherein the battery system is used to supply power to the load.

[0013] Optionally, the load is a power conversion system.

[0014] The battery system and energy storage device provided by this utility model have the following beneficial effects: Because only one pre-charging circuit is used, all batteries share the pre-charging circuit. For example, after the first battery has completed pre-charging and fully powered the load, the second battery can use the pre-charging circuit to pre-power the load. Then, the second battery fully powers the load, and the third, fourth, and other batteries that have not yet completed power supply can sequentially use the pre-charging circuit to pre-power the load and fully power the load. Therefore, compared with the existing battery system where each battery has its own pre-charging circuit, the cost of the battery system can be effectively saved, and the space of the battery system can also be saved. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the battery system and load in an embodiment of this utility model; Figure 2 This is a circuit diagram of the battery system in an embodiment of this utility model; Figure 3 This is a flowchart of the battery system pre-charging process in an embodiment of this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] refer to Figure 1 and Figure 2 , Figure 1 This is a circuit diagram of the battery system and load in an embodiment of this utility model. Figure 2This is a circuit diagram of a battery system in an embodiment of the present invention. This embodiment provides a battery system for supplying power to a load, including a pre-charging circuit, multiple batteries, a main relay corresponding to the number of batteries, and on / off switches corresponding to the number of batteries. The main relay is disposed between the batteries and the load. One end of the pre-charging circuit is connected to the positive terminal of the load, and the other end is connected to the positive terminals of multiple batteries through multiple on / off switches, and each on / off switch corresponds to one battery.

[0023] Because only one pre-charging circuit is used, all batteries share the pre-charging circuit. For example, after the first battery has completed pre-charging and fully powered the load, the second battery can use the pre-charging circuit to pre-power the load. Then, the second battery fully powers the load, and the third, fourth, and other batteries that have not yet completed power supply can sequentially use the pre-charging circuit to pre-power the load and fully power the load. Therefore, compared with the existing battery system where each battery has its own pre-charging circuit, the cost of the battery system can be effectively saved, and the space of the battery system can also be saved.

[0024] Specifically, the main relay includes a first relay KM1 and a second relay KM2. The number of first relays KM1 corresponds to the number of batteries. One end of the first relay KM1 is connected to the positive terminal of the battery, and the other end is connected to the positive terminal of the load. The number of second relays KM2 corresponds to the number of batteries. One end of the second relay KM2 is connected to the negative terminal of the battery, and the other end is connected to the negative terminal of the load.

[0025] The pre-charging circuit includes a pre-charging resistor R1 and a pre-charging relay KM3. One end of the pre-charging relay KM3 is connected to the positive terminal of the battery, and the other end is connected to the positive terminal of the load. The pre-charging resistor R1 is disposed between the pre-charging relay KM3 and the positive terminal of the load, or between the positive terminal of the battery and the pre-charging relay KM3.

[0026] The battery system also includes a hybrid switch QF, which is disposed between the battery and the load.

[0027] Specifically, the hybrid switch QF is disposed between the positive terminal of the battery and the positive terminal of the load, and between the negative terminal of the battery and the negative terminal of the load.

[0028] The battery system also includes a fuse FU corresponding to the number of batteries, the fuse FU being disposed between the positive terminal of the battery and the positive terminal of the load.

[0029] The battery system also includes a current Hall effect sensor (FL) corresponding to the number of batteries, used to detect the battery charging and discharging current. The current Hall effect sensor is located between the positive terminal of the battery and the positive terminal of the load.

[0030] In this embodiment, there are two batteries, and two main relays and two on / off switches. The on / off switches are a first on / off switch K1 and a second on / off switch K2. The batteries are a first battery and a second battery. Specifically, the first on / off switch K1 corresponds to the first battery, and the second on / off switch K2 corresponds to the second battery.

[0031] The battery system also includes a battery management system (BMS), which is connected to the precharge relay, the two main relays, and the two on / off switches, and is used to control the on / off state of the precharge relay, the two main relays, and the two on / off switches.

[0032] In this embodiment, reference Figure 3 , Figure 3 This is a flowchart of the pre-charging process of the battery system in this embodiment of the present invention. The pre-charging process of the battery system (including two batteries) is as follows: The first step is to power it on; The second step is to initiate the first-level pre-charge; The third step is to close the two second relays KM2 in sequence; The fourth step is to determine if the battery voltage difference is less than 10V. If it is, proceed to the fifth step; otherwise, an alarm will sound indicating a power-on failure. Fifth step: Close the pre-charge relay KM3 and the first on / off switch K1 to perform parallel pre-charge of the battery; Step 6: Determine if the battery voltage difference is less than 10V. If yes, proceed to step 7. If no, determine if the pre-charge time is greater than 1 minute. If yes, issue a level 1 alarm for pre-charge failure. If no, return to step 5. Step 7: Close the first relay KM1 connected to the first battery, and disconnect the first on / off switch K1 after 5 seconds; Step 8: Initiate Level 2 pre-charging; Step 9: Close the second on / off switch K2 to perform pre-charging; Step 10: Determine if the battery voltage difference is less than 20V. If yes, proceed to step 11. If no, determine if the pre-charge time is greater than 5 seconds. If yes, issue an alarm indicating secondary pre-charge failure. If no, return to step 9. Step 11: Close the first relay KM1 connected to the second battery, and after 5 seconds, disconnect the second on / off switch K2 and the precharge relay KM3 in sequence. Step 12: Second-level pre-charging complete, system successfully powered on.

[0033] This embodiment also provides an energy storage device, including a load and the aforementioned battery system, wherein the battery system is used to supply power to the load.

[0034] The load is a power conversion system (PCS).

[0035] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A battery system for powering a load, characterized by, It includes a pre-charging circuit, multiple batteries, a main relay corresponding to the number of batteries, and on / off switches corresponding to the number of batteries. The main relay is located between the batteries and the load. One end of the pre-charging circuit is connected to the positive terminal of the load, and the other end is connected to the positive terminals of multiple batteries through multiple on / off switches, with each on / off switch corresponding to a battery.

2. The battery system of claim 1, wherein, The main relay includes a first relay and a second relay. The number of first relays corresponds to the number of batteries. One end of the first relay is connected to the positive terminal of the battery, and the other end is connected to the positive terminal of the load. The number of second relays corresponds to the number of batteries. One end of the second relay is connected to the negative terminal of the battery, and the other end is connected to the negative terminal of the load.

3. The battery system of claim 1, wherein, The pre-charging circuit includes a pre-charging resistor and a pre-charging relay. One end of the pre-charging relay is connected to the positive terminal of the battery, and the other end is connected to the positive terminal of the load. The pre-charging resistor is disposed between the pre-charging relay and the positive terminal of the load, or between the positive terminal of the battery and the pre-charging relay.

4. The battery system of claim 1, wherein, It also includes a hybrid switch disposed between the battery and the load.

5. The battery system of claim 4, wherein, The hybrid switch is disposed between the positive terminal of the battery and the positive terminal of the load, and between the negative terminal of the battery and the negative terminal of the load.

6. The battery system of claim 1, wherein, It also includes a fuse corresponding to the number of batteries, the fuse being disposed between the positive terminal of the battery and the positive terminal of the load.

7. The battery system of claim 1, wherein, It also includes a current Hall effect sensor corresponding to the number of batteries, used to detect the battery charging and discharging current, the current Hall effect sensor being disposed between the positive terminal of the battery and the positive terminal of the load.

8. The battery system of claim 1, wherein, The number of batteries is two, and the number of main relays and on / off switches is also two.

9. An energy storage device, characterized by, It includes a load and a battery system as described in any one of claims 1-8, the battery system being used to power the load.

10. The energy storage device of claim 9, wherein, The load is a power conversion system.

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