Energy storage battery pack system

Abstract

The utility model relates to the technical field of battery application energy storage, and discloses an energy storage battery pack system, which comprises a control module, a first voltage conversion circuit capable of performing voltage conversion and a plurality of battery packs, and is characterized in that the control module compares the voltage of a battery pack to be replaced with the voltage of the system battery pack and controls the battery pack to be replaced based on the comparison result. And the to-be-replaced battery pack is controlled to be charged or discharged, so that the voltage of the to-be-replaced battery pack is matched with the voltage of the system battery pack, and the problem of high system maintenance difficulty is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery application energy storage, and in particular to an energy storage battery pack system. Background Art

[0002] As people's awareness of environmental protection increases, renewable energy products have been widely popularized and applied. Take electric vehicles as an example. Electric vehicles consume a lot of electricity during operation. However, electric vehicles have limited energy storage capacity and service life. When electric vehicles run for a long time, the power batteries inside the electric vehicles will gradually lose their energy storage capacity due to the long charging and discharging process. Therefore, users need to replace the power batteries in electric vehicles regularly.

[0003] However, in current energy storage battery pack systems, when a battery pack in the system is damaged and needs to be replaced, the voltage difference between the replaced battery pack and other packs in the system exceeds the requirements of the product specification. The system cannot automatically balance, making maintenance very troublesome. Utility Model Content

[0004] In view of this, the present invention provides an energy storage battery pack system to solve the problem of how to balance the voltage between the replaced Pack and other Packs in the system itself.

[0005] The utility model provides an energy storage battery pack system, comprising: a control module, a first voltage conversion circuit and a plurality of battery packs, the plurality of battery packs comprising: a battery pack to be replaced and a system battery pack, wherein a first end of the first voltage conversion circuit is connected to a power supply, and a second end of the first voltage conversion circuit is connected to a first end of the battery pack to be replaced; a first end of the control module is connected to a second end of the battery pack to be replaced, a second end of the control module is connected to a third end of the first voltage conversion circuit, a third end of the control module is connected to a third end of the battery pack to be replaced, and a fourth end of the control module is connected to the system battery pack; a fourth end of the battery pack to be replaced is connected to a load; the control module obtains voltage data of the battery pack to be replaced and the system battery pack; when the voltage of the battery pack to be replaced is lower than the voltage of the system battery pack, the control module enables the first voltage conversion circuit, and the power supply charges the battery pack to be replaced; during the charging process of the battery pack to be replaced, when the voltage of the battery pack to be replaced is equal to the voltage of the system battery pack, the control module locks the first voltage conversion circuit; when the voltage of the battery pack to be replaced is higher than the voltage of the system battery pack, the control module enables the battery pack to be replaced, and the battery pack to be replaced is discharged to the load.

[0006] The utility model provides a control module and a first voltage conversion circuit capable of performing voltage conversion. The control module compares the voltage of the battery pack to be replaced and the system battery pack, and based on the comparison result, controls the charging or discharging of the battery pack to be replaced, so that the voltage of the battery pack to be replaced matches the voltage of the system battery pack, solving the problem of difficult system maintenance.

[0007] In an optional embodiment, the first voltage conversion circuit includes: an AC-DC circuit, wherein the AC side of the AC-DC circuit is connected to the power supply, and the DC side of the AC-DC circuit is connected to the first end of the battery pack to be replaced and the second end of the control module.

[0008] In an optional embodiment, the AC-DC circuit is a bidirectional inverter; when the voltage of the battery pack to be replaced is higher than the voltage of the system battery pack, the control module enables the battery pack to be replaced, and the battery pack to be replaced is discharged to the power supply through the bidirectional inverter.

[0009] In an optional embodiment, the first voltage conversion circuit further includes: a DC-DC circuit, wherein a first end of the DC-DC circuit is connected to the DC side of the AC-DC circuit, and a second end of the DC-DC module is connected to a second end of the control module.

[0010] In an optional implementation, the DC-DC circuit is any one of a flyback circuit, a boost circuit, and an SPS circuit.

[0011] In an optional embodiment, the first voltage conversion circuit further includes: a transformer, wherein the primary side of the transformer is connected to the AC side of the AC-DC circuit, and the secondary side of the transformer is connected to the first end of the DC-DC module.

[0012] In an optional embodiment, the energy storage battery pack system further includes: a second voltage conversion circuit, wherein the fourth end of the battery pack to be replaced is connected to the load through the second voltage conversion circuit.

[0013] In an optional implementation, the control module is an MCU chip.

[0014] In an optional implementation, the control module obtains voltage data of the battery pack to be replaced and the system battery pack through CAN / 485 communication.

[0015] In an optional embodiment, the second end of the first voltage conversion circuit is connected to the first end of the battery pack to be replaced through a fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a composition diagram of an energy storage battery pack system according to an embodiment of the present utility model;

[0018] Figure 2 is a composition diagram of another energy storage battery pack system according to an embodiment of the present utility model;

[0019] Figure 3 is a composition diagram of another energy storage battery pack system according to an embodiment of the present utility model;

[0020] Figure 4 This is a specific circuit structure diagram of the energy storage battery pack system according to an embodiment of the present utility model;

[0021] Figure 5 It is a composition diagram of another energy storage battery pack system according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0023] In this embodiment, an energy storage battery pack system is provided. Figure 1 The energy storage battery pack system includes: a first voltage conversion circuit, a control module and multiple battery packs, the multiple battery packs include: a battery pack to be replaced and a system battery pack, Figure 1 Only the control module is shown to be connected to one system battery pack and the battery pack to be replaced.

[0024] like Figure 1As shown, the first end of the first voltage conversion circuit is connected to the power supply, and the second end of the first voltage conversion circuit is connected to the first end of the battery pack to be replaced; the first end of the control module is connected to the second end of the battery pack to be replaced, the second end of the control module is connected to the third end of the first voltage conversion circuit, the third end of the control module is connected to the third end of the battery pack to be replaced, and the fourth end of the control module is connected to the system battery pack; the fourth end of the battery pack to be replaced is connected to the load; the control module obtains voltage data of the battery pack to be replaced and the system battery pack.

[0025] Specifically, when the voltage of the battery pack to be replaced is lower than the voltage of the system battery pack, the control module enables the first voltage conversion circuit, and the power supply charges the battery pack to be replaced; during the charging process of the battery pack to be replaced, when the voltage of the battery pack to be replaced is equal to the voltage of the system battery pack, the control module locks the first voltage conversion circuit; when the voltage of the battery pack to be replaced is higher than the voltage of the system battery pack, the control module enables the battery pack to be replaced, and the battery pack to be replaced discharges to the load.

[0026] Specifically, the first voltage conversion circuit can transform the amplitude, frequency or phase of the power supply to obtain the charging voltage of the battery pack to be replaced and the power supply voltage of the control module. Optionally, when the power supply is direct current, the first voltage conversion circuit is a DC-DC circuit, which is not limited to a BUCK circuit, a BOOST circuit, a BUCK-BOOST circuit, etc. When the power supply is alternating current, the first conversion module is an AC-DC circuit, which can be a single-phase circuit, a three-phase circuit, a full-wave circuit, a half-wave circuit, etc., and is not limited here.

[0027] Specifically, the control module can read the voltage data of the battery pack and determine whether the battery pack to be replaced should be charged, discharged, stopped discharging, or stopped charging based on the voltage data.

[0028] Optionally, the control module includes a built-in comparator circuit that compares the voltage of the battery to be replaced with the system battery pack voltage. When the voltage of the battery to be replaced is greater than the system battery pack voltage, the comparator circuit sends a first-level signal to the battery pack to be replaced, causing the battery pack to discharge into the load. When the voltage of the battery to be replaced is less than the system battery pack voltage, the comparator circuit sends a second-level signal to the first voltage conversion circuit. Once enabled, the first voltage conversion circuit converts the power supply voltage into a charging voltage, which is used to charge the battery pack to be replaced.

[0029] Optionally, during the charging and discharging process of the battery pack to be replaced, the comparison circuit compares the voltage of the battery to be replaced with the system battery pack voltage in real time. When the two voltages are equal, the comparison circuit sends a corresponding level signal to the battery pack to be replaced or the first voltage conversion circuit to stop discharging and charging.

[0030] Optionally, the comparison circuit can be a digital circuit or an analog circuit. When the comparison circuit is a digital circuit, the digital circuit can implement analog-to-digital conversion and voltage comparison. The comparison method built into the digital circuit is a mature method in the prior art and will not be described in detail here. When the comparison circuit is an analog circuit, the analog circuit includes a comparator.

[0031] Optionally, the control module can actually be a battery management system in the prior art, which can control functions such as charging and discharging of the battery pack to be replaced and the system battery pack.

[0032] In some optional embodiments, such as Figure 2 As shown, the first voltage conversion circuit includes: an AC-DC circuit, wherein the AC side of the AC-DC circuit is connected to the power supply, and the DC side of the AC-DC circuit is connected to the first end of the battery pack to be replaced and the second end of the control module.

[0033] Optionally, the AC-DC circuit is a bidirectional inverter; when the voltage of the battery pack to be replaced is higher than the voltage of the system battery pack, the control module enables the battery pack to be replaced, and the battery pack to be replaced is discharged to the power supply through the bidirectional inverter.

[0034] Optionally, the bidirectional inverter can be composed of a bidirectional AC-DC circuit, which can realize the conversion of DC to AC, or AC to DC. In order to match the voltage of the battery pack and control module to be replaced, the bidirectional inverter can also connect multiple DC-DC circuits at the rear stage of the bidirectional AC-DC circuit to output DC with different amplitudes.

[0035] In some optional embodiments, such as Figure 3 As shown, the first voltage conversion circuit further includes: a DC-DC circuit, wherein a first end of the DC-DC circuit is connected to the DC side of the AC-DC circuit, and a second end of the DC-DC module is connected to a second end of the control module.

[0036] Specifically, in order to match the power supply voltage level of the control module, after the AC-DC circuit converts the alternating current into direct current, the DC-DC circuit performs a voltage step-up and then a voltage step-down process on the direct current.

[0037] Optionally, the DC-DC circuit is any one of a flyback circuit, a boost circuit, and an SPS circuit.

[0038] In some optional embodiments, such as Figure 4 As shown, the first voltage conversion circuit further includes: a transformer, wherein the primary side of the transformer is connected to the AC side of the AC-DC circuit, and the secondary side of the transformer is connected to the first end of the DC-DC module.

[0039] In some optional embodiments, such as Figure 3 As shown, the energy storage battery pack system also includes: a second voltage conversion circuit, wherein the fourth end of the battery pack to be replaced is connected to the load through the second voltage conversion circuit.

[0040] Specifically, in order to match the discharge voltage of the battery pack to be replaced with the supply voltage of the load, a second voltage conversion circuit can be provided. Optionally, the second voltage conversion circuit is an AC-DC circuit or a DC-DC circuit, and the second voltage conversion circuit can step up, step down, or invert the discharge voltage into AC power.

[0041] Optionally, in order to ensure reliable discharge of the battery pack to be replaced, a filter circuit may be provided between the battery pack to be replaced and the load to filter out clutter.

[0042] In some optional implementations, the control module is an MCU chip. Specifically, the MCU chip can implement functions such as conversion of voltage analog signals to voltage digital signals and voltage comparison.

[0043] In some optional embodiments, such as Figure 5 As shown, the control module obtains voltage data of the battery pack to be replaced and the system battery pack through CAN / 485 communication. The control module's CAN / 485 communication port receives the replacement pack-CAN / 485 communication port and the system pack-CAN / 485 communication port to read voltage data and transmit control commands.

[0044] In some optional embodiments, such as Figure 4 As shown, the energy storage battery pack system further includes: a second terminal of the first voltage conversion circuit is connected to the first terminal of the battery pack to be replaced through a fuse. When the line current is too large, the fuse is disconnected to protect the battery pack to be replaced or the control module.

[0045] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. An energy storage battery pack system, characterized in that: include: A control module, a first voltage conversion circuit and a plurality of battery packs, wherein the plurality of battery packs include: a battery pack to be replaced and a system battery pack, wherein: A first end of the first voltage conversion circuit is connected to a power supply, and a second end of the first voltage conversion circuit is connected to a first end of the battery pack to be replaced; A first terminal of the control module is connected to a second terminal of the battery pack to be replaced, a second terminal of the control module is connected to a third terminal of the first voltage conversion circuit, a third terminal of the control module is connected to a third terminal of the battery pack to be replaced, and a fourth terminal of the control module is connected to a system battery pack; The fourth terminal of the battery pack to be replaced is connected to the load; the control module obtains voltage data of the battery pack to be replaced and the system battery pack; When the voltage of the battery pack to be replaced is lower than the voltage of the system battery pack, the control module enables the first voltage conversion circuit, and the power supply charges the battery pack to be replaced; during the charging process of the battery pack to be replaced, when the voltage of the battery pack to be replaced is equal to the voltage of the system battery pack, the control module locks the first voltage conversion circuit; When the voltage of the battery pack to be replaced is higher than the voltage of the system battery pack, the control module enables the battery pack to be replaced, and the battery pack to be replaced discharges to the load.

2. The energy storage battery pack system according to claim 1, characterized in that: The first voltage conversion circuit includes: an AC-DC circuit, wherein: The AC side of the AC-DC circuit is connected to the power supply, and the DC side of the AC-DC circuit is connected to the first end of the battery pack to be replaced and the second end of the control module.

3. The energy storage battery pack system according to claim 2, characterized in that: The AC-DC circuit is a bidirectional inverter; When the voltage of the battery pack to be replaced is higher than the voltage of the system battery pack, the control module enables the battery pack to be replaced, and the battery pack to be replaced is discharged to the power supply through the bidirectional inverter.

4. The energy storage battery pack system according to claim 2, characterized in that: The first voltage conversion circuit further includes: a DC-DC circuit, wherein: A first end of the DC-DC circuit is connected to the DC side of the AC-DC circuit, and a second end of the DC-DC circuit is connected to the second end of the control module.

5. The energy storage battery pack system according to claim 4, characterized in that: The DC-DC circuit is any one of a flyback circuit, a boost circuit, and an SPS circuit.

6. The energy storage battery pack system according to claim 4, characterized in that: The first voltage conversion circuit further includes a transformer, wherein: The primary side of the transformer is connected to the AC side of the AC-DC circuit, and the secondary side of the transformer is connected to the first end of the DC-DC circuit.

7. The energy storage battery pack system according to claim 1, characterized in that: Also includes: The second voltage conversion circuit, wherein The fourth end of the battery pack to be replaced is connected to the load through the second voltage conversion circuit.

8. The energy storage battery pack system according to claim 1, characterized in that: The control module is an MCU chip.

9. The energy storage battery pack system according to claim 1, characterized in that: The control module obtains voltage data of the battery pack to be replaced and the system battery pack through CAN / 485 communication.

10. The energy storage battery pack system according to claim 1, characterized in that: Also includes: The second end of the first voltage conversion circuit is connected to the first end of the battery pack to be replaced through a fuse.

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