Lithium battery integrated power supply and power supply system

Abstract

The utility model provides a lithium battery integrated power supply and a power supply system. The lithium battery integrated power supply comprises at least two battery modules; the battery module comprises a lithium battery unit, a charging non-return diode, a discharging non-return diode and a charging control switch; the positive electrode of the lithium battery unit is respectively connected with the negative electrode of the charging non-return diode and the positive electrode of the discharging non-return diode, and the negative electrode of the lithium battery unit is respectively connected with the negative input end and the negative output end; the anode of the charging non-return diode is connected with the positive input end; the cathode of the discharge non-return diode is connected with the positive output end; the charging control switch and the charging non-return diode are connected in series between the positive electrode and the positive input end of the lithium battery unit; and the charging control switches of the battery modules are switched on in a time-sharing manner. A plurality of battery modules are connected in parallel, and each charging control switch is switched on in a time-sharing manner, so that single-charging and multi-charging can be formed by a lithium battery, and actual application requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a lithium battery integrated power supply and a power supply system. Background Art

[0002] In the power grid, in order to ensure the stability of power supply, batteries are usually set up to store energy and ensure the stability of power supply. In order to increase the energy storage capacity, multiple battery modules are usually connected in parallel to form a single-charge multi-power system. The batteries in the single-charge multi-power system are usually lead-acid batteries. With the development of lithium battery technology, lithium batteries have long life, high capacity, and high safety factor. Therefore, it is hoped that lithium batteries will be used in the single-charge multi-power system.

[0003] In the prior art, the architecture of a single-charger dual-battery system cannot be directly applied to lithium batteries. Therefore, it is necessary to provide a single-charger multi-battery system using lithium batteries. Utility Model Content

[0004] The embodiment of the utility model provides a lithium battery integrated power supply and power supply system to solve the problem of lack of single-charge multi-power system of lithium battery in the prior art.

[0005] In a first aspect, an embodiment of the utility model provides a lithium battery integrated power supply, comprising: at least two battery modules; wherein the positive input terminal of each battery module is connected, the negative input terminal of each battery module is connected, the positive output terminal of each battery module is connected, and the negative output terminal of each battery module is connected; the positive input terminal and the negative input terminal are used to connect to a charging power supply; the positive output terminal and the negative output terminal are used to supply power to a load;

[0006] The battery module includes: a lithium battery unit, a charging check diode, a discharging check diode and a charging control switch;

[0007] The positive electrode of the lithium battery unit is respectively connected to the cathode of the charging check diode and the anode of the discharging check diode, and the negative electrode of the lithium battery unit is respectively connected to the negative input terminal and the negative output terminal;

[0008] The anode of the charging check diode is connected to the positive input terminal; the cathode of the discharging check diode is connected to the positive output terminal;

[0009] The charging control switch and the charging check diode are connected in series between the positive electrode and the positive input terminal of the lithium battery unit;

[0010] The charging control switches of the various battery modules are turned on in different time periods.

[0011] Optionally, the lithium battery unit includes: a lithium battery pack and a dual-way battery switch;

[0012] The first circuit of the dual-circuit battery switch is connected in series between the positive electrode of the lithium battery pack and the positive electrode of the lithium battery unit, and the second circuit of the dual-circuit battery switch is connected in series between the negative electrode of the lithium battery pack and the negative electrode of the lithium battery unit.

[0013] Optionally, the lithium battery unit further includes: a sampling resistor;

[0014] The sampling resistor is connected in series in the charging and discharging path of the lithium battery pack.

[0015] Optionally, the battery module further includes: a dual-channel output switch;

[0016] The first of the dual-channel output switches is connected in series between the cathode of the discharge check diode and the positive output terminal, and the second of the dual-channel output switches is connected in series between the negative electrode of the lithium battery unit and the negative output terminal.

[0017] Optionally, the lithium battery integrated power supply further includes: a dual-channel charging switch;

[0018] The first of the dual-way charging switches is connected in series between the positive electrode of the charging power source and the positive input terminal, and the second of the dual-way charging switches is connected in series between the negative electrode of the charging power source and the negative input terminal.

[0019] Optionally, the dual-circuit charging switch is a circuit breaker.

[0020] Optionally, the battery module further includes: a discharge test check diode and a discharge test switch;

[0021] The anode of the discharge test check diode is connected to the positive electrode of the lithium battery unit, and the cathode of the discharge test check diode is connected to the positive test output terminal; the negative electrode of the lithium battery unit is connected to the negative test output terminal;

[0022] The discharge test switch and the discharge test check diode are connected in series between the positive electrode of the lithium battery unit and the positive test output terminal;

[0023] Among them, the positive test output terminal and the negative test output terminal are used to supply power to the test load.

[0024] Optionally, the battery module further includes: a dual-circuit discharge test switch;

[0025] The first of the two-way discharge test switches is connected in series between the positive test output terminal and the test load, and the second of the two-way discharge test switches is connected in series between the negative test output terminal and the test load.

[0026] Optionally, both the charging control switch and the discharge test switch are contactors.

[0027] In a second aspect, the present invention provides a power supply system, including any one of the lithium-ion integrated power supplies provided in the first aspect of the above embodiment.

[0028] The embodiment of the utility model provides a lithium battery integrated power supply and power supply system. The above lithium battery integrated power supply includes: at least two battery modules; wherein the positive input end of each battery module is connected, the negative input end of each battery module is connected, the positive output end of each battery module is connected, and the negative output end of each battery module is connected; the positive input end and the negative input end are used to connect to the charging power supply; the positive output end and the negative output end are used to power the load; the battery module includes: a lithium battery unit, a charging check diode, a discharge check diode and a charging control switch; the positive electrode of the lithium battery unit is respectively connected to the cathode of the charging check diode and the anode of the discharge check diode, and the negative electrode of the lithium battery unit is respectively connected to the negative input end and the negative output end; the anode of the charging check diode is connected to the positive input end; the cathode of the discharge check diode is connected to the positive output end; the charging control switch and the charging check diode are connected in series between the positive electrode and the positive input end of the lithium battery unit; wherein the charging control switch of each battery module is turned on in time. The present application can charge multiple battery modules by controlling the switch to conduct in time, and at the same time, a charging check diode and a discharging check diode are provided to prevent mutual charging and discharging between the battery modules. Lithium batteries are used to form a single-charge multi-power system, thereby increasing the capacity of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 This is a schematic diagram of the circuit structure of a lithium-ion integrated power supply provided by an embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of a circuit structure of a battery module provided by an embodiment of the utility model;

[0032] Figure 3 This is a circuit structure diagram of another lithium battery integrated power supply provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0034] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0035] The following is a detailed description of the implementation of the present invention in conjunction with the specific drawings:

[0036] Figure 1 This is a schematic diagram of the structure of a lithium-ion integrated power supply provided by the embodiment of the utility model. Figure 1 The lithium battery integrated power supply comprises: at least two battery modules 1; wherein the positive input terminal Vi+ of each battery module 1 is connected, the negative input terminal Vi- of each battery module 1 is connected, the positive output terminal Vo+ of each battery module 1 is connected, and the negative output terminal Vo- of each battery module 1 is connected; the positive input terminal Vi+ and the negative input terminal are used to connect to a charging power source; the positive output terminal Vo+ and the negative output terminal Vo- are used to supply power to a load;

[0037] The battery module 1 includes: a lithium battery unit 11, a charging check diode D1, a discharging check diode D2 and a charging control switch KM1;

[0038] The positive electrode of the lithium battery unit 11 is connected to the cathode of the charging check diode D1 and the anode of the discharging check diode D2, respectively, and the negative electrode of the lithium battery unit 11 is connected to the negative input terminal Vi- and the negative output terminal Vo- respectively;

[0039] The anode of the charging check diode D1 is connected to the positive input terminal Vi+; the cathode of the discharging check diode D2 is connected to the positive output terminal Vo+;

[0040] The charging control switch KM1 and the charging non-return diode D1 are connected in series between the positive electrode of the lithium battery unit 11 and the positive input terminal Vi+;

[0041] The charging control switch KM1 of each battery module 1 is turned on in a time-sharing manner.

[0042] In the embodiment of the utility model, multiple battery modules 1 are charged and discharged in parallel to increase the capacity of the lithium-ion integrated power supply. At the same time, each battery module 1 is provided with a charging control switch KM1, and each charging control switch KM1 can be turned on in different time periods to charge each battery module 1 separately, thereby avoiding overcharging or other safety problems caused by uneven charging current of each battery module 1 at the same time. Each battery module 1 can discharge at the same time. Since each battery module 1 is provided with a charging check diode D1 and a discharging check diode D2, when the lithium battery unit 11 discharges, the charging check diode D1 is reversely cut off and will not affect the charging power supply. At the same time, although the positive input terminal Vi+ and the negative input terminal Vi- of each battery module 1 are connected, due to the existence of the charging check diode D1, each lithium battery unit 11 will not affect other lithium battery units 11 through the connected positive input terminal Vi+ and negative input terminal Vi-. Moreover, the positive output terminal Vo+ and the negative output terminal Vo- of each lithium battery module 1 are connected, but due to the existence of the discharging check diode D2, each lithium battery unit 11 will not affect other lithium battery units 11 through the connected positive output terminal Vo+ and negative output terminal Vo-, thereby avoiding the occurrence of mutual charging of each lithium battery unit 11.

[0043] Based on the above, the embodiment of the utility model uses lithium batteries to build a multi-power system to form a lithium-powered integrated power supply, which greatly improves the capacity of the power supply system, is safe and stable, and has a simple circuit structure.

[0044] In one possible implementation, reference Figure 2 , the lithium battery unit 11 may include: a lithium battery pack BT and a dual-way battery switch QF1;

[0045] The first of the dual-way battery switches QF1 is connected in series between the positive electrode of the lithium battery pack BT and the positive electrode of the lithium battery unit 11 , and the second of the dual-way battery switch QF1 is connected in series between the negative electrode of the lithium battery pack BT and the negative electrode of the lithium battery unit 11 .

[0046] In the embodiment of the utility model, the lithium battery unit 11 can be provided with a dual-way battery switch QF1 for controlling the charging and discharging of the lithium battery pack BT.

[0047] Exemplarily, the dual-circuit battery switch QF1 may be a circuit breaker.

[0048] In one possible implementation, reference Figure 2 , the lithium battery unit 11 may further include: a sampling resistor R;

[0049] The sampling resistor R is connected in series in the charging and discharging path of the lithium battery pack BT.

[0050] In the embodiment of the utility model, a sampling resistor R may be provided in the charge and discharge path of the lithium battery pack BT for sampling the charge and discharge current of the lithium battery pack BT and for controlling the charge and discharge of the lithium battery pack BT.

[0051] In one possible implementation, reference Figure 2 , the battery module 1 may further include: a dual-channel output switch QF2;

[0052] The first of the dual output switches QF2 is connected in series between the cathode of the discharge check diode D2 and the positive output terminal Vo+, and the second of the dual output switch QF2 is connected in series between the negative electrode of the lithium battery unit 11 and the negative output terminal Vo-.

[0053] In the embodiment of the utility model, a dual output switch QF2 is provided at the output end of the battery module 1 to control the output of the battery module 1. The dual output switch QF2 can be controlled to be turned on when the battery module 1 is discharging, and the dual output switch QF2 can be controlled to be turned off when the battery module 1 is charging.

[0054] Exemplarily, the dual-output switch QF2 can be a circuit breaker, and the two output switches in the dual-output switch QF2 are opened and closed at the same time.

[0055] In one possible implementation, reference Figure 3 , the lithium battery integrated power supply may also include: a dual-channel charging switch QF3;

[0056] The first of the dual charging switches QF3 is connected in series between the positive electrode of the charging power source and the positive input terminal Vi+, and the second of the dual charging switches QF3 is connected in series between the negative electrode of the charging power source and the negative input terminal Vi-.

[0057] In the embodiment of the utility model, a dual-way charging switch QF3 is provided at the front end of each battery module 1 to control the access of the charging power supply; when charging, the dual-way charging switch QF3 is controlled to be closed to connect the charging power supply, and then the charging control switch KM1 of each battery module 1 is controlled to be turned on in time according to actual application requirements to charge each battery module 1 in time; when not charging, the dual-way charging switch QF3 is controlled to be turned off to cut off the connection path between each battery module 1 and the charging power supply.

[0058] In a possible implementation, the dual-circuit charging switch QF3 may be a circuit breaker.

[0059] In one possible implementation, reference Figure 2 , the battery module 1 may further include: a discharge test check diode D3 and a discharge test switch KM2;

[0060] The anode of the discharge test check diode D3 is connected to the positive electrode of the lithium battery unit 11, and the cathode of the discharge test check diode D3 is connected to the positive test output terminal; the negative electrode of the lithium battery unit 11 is connected to the negative test output terminal;

[0061] The discharge test switch KM2 and the discharge test backstop diode D3 are connected in series between the positive electrode of the lithium battery unit 11 and the positive test output terminal;

[0062] Among them, the positive test output terminal and the negative test output terminal are used to supply power to the test load.

[0063] To meet the testing requirements, a test path can also be set for each battery module 1 in the embodiment of the utility model, specifically, including a discharge test switch KM2 for controlling the on and off of the test path; it also includes: a discharge test check diode D3, which can only be conducted in one direction to avoid the experimental load from affecting the internal circuit.

[0064] In one possible implementation, reference Figure 2 , the battery module 1 may further include: a dual-circuit discharge test switch QF4;

[0065] The first one of the dual-channel discharge test switches QF4 is connected in series between the positive test output terminal and the test load, and the second one of the dual-channel discharge test switch QF4 is connected in series between the negative test output terminal and the test load.

[0066] The dual-channel discharge test switch QF4 is used to control the access of the test load and is redundantly set with the discharge test switch KM2, which improves the safety and reliability of the power supply.

[0067] Exemplarily, the dual-circuit discharge test switch QF4 may be a circuit breaker.

[0068] In a possible implementation manner, both the charging control switch KM1 and the discharging test switch KM2 are contactors.

[0069] Corresponding to the above embodiments, the embodiments of the utility model further provide a power supply system, including the lithium-ion integrated power supply provided by any of the above embodiments, and having the advantages of the above lithium-ion integrated power supply, which will not be described in detail here.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery integrated power supply, characterized in that: include: At least two battery modules; wherein the positive input terminals of the battery modules are connected, the negative input terminals of the battery modules are connected, the positive output terminals of the battery modules are connected, and the negative output terminals of the battery modules are connected; the positive input terminal and the negative input terminal are used to connect to a charging power source; the positive output terminal and the negative output terminal are used to supply power to a load; The battery module includes: a lithium battery unit, a charging check diode, a discharging check diode and a charging control switch; The positive electrode of the lithium battery unit is respectively connected to the cathode of the charging check diode and the anode of the discharging check diode, and the negative electrode of the lithium battery unit is respectively connected to the negative input terminal and the negative output terminal; The anode of the charging check diode is connected to the positive input terminal; the cathode of the discharging check diode is connected to the positive output terminal; The charging control switch and the charging check diode are connected in series between the positive electrode of the lithium battery unit and the positive input terminal; The charging control switches of the various battery modules are turned on in different time periods.

2. The lithium-ion integrated power supply according to claim 1, characterized in that: The lithium battery unit includes: a lithium battery pack and a dual-way battery switch; The first circuit of the dual-circuit battery switch is connected in series between the positive electrode of the lithium battery pack and the positive electrode of the lithium battery unit, and the second circuit of the dual-circuit battery switch is connected in series between the negative electrode of the lithium battery pack and the negative electrode of the lithium battery unit.

3. The lithium-ion integrated power supply according to claim 2, characterized in that: The lithium battery unit also includes: a sampling resistor; The sampling resistor is connected in series in the charging and discharging path of the lithium battery pack.

4. The lithium-ion integrated power supply according to claim 1, characterized in that: The battery module further includes: a dual-channel output switch; The first of the dual output switches is connected in series between the cathode of the discharge check diode and the positive output terminal, and the second of the dual output switches is connected in series between the negative electrode of the lithium battery unit and the negative output terminal.

5. The lithium-ion integrated power supply according to claim 1, characterized in that: The lithium battery integrated power supply further includes: a dual-circuit charging switch; The first of the two-way charging switches is connected in series between the positive electrode of the charging power source and the positive input terminal, and the second of the two-way charging switches is connected in series between the negative electrode of the charging power source and the negative input terminal.

6. The lithium-ion integrated power supply according to claim 5, characterized in that: The dual-circuit charging switch is a circuit breaker.

7. The lithium-ion integrated power supply according to any one of claims 1 to 6, characterized in that: The battery module further includes: a discharge test check diode and a discharge test switch; The anode of the discharge test check diode is connected to the positive electrode of the lithium battery unit, and the cathode of the discharge test check diode is connected to the positive test output terminal; the negative electrode of the lithium battery unit is connected to the negative test output terminal; The discharge test switch and the discharge test check diode are connected in series between the positive electrode of the lithium battery unit and the positive test output terminal; Wherein, the positive test output terminal and the negative test output terminal are used to supply power to the test load.

8. The lithium-ion integrated power supply according to claim 7, characterized in that: The battery module further comprises: a dual-circuit discharge test switch; The first of the dual-channel discharge test switches is connected in series between the positive test output terminal and the test load, and the second of the dual-channel discharge test switches is connected in series between the negative test output terminal and the test load.

9. The lithium-ion integrated power supply according to claim 7, characterized in that: The charging control switch and the discharge test switch are both contactors.

10. A power supply system, characterized in that: A lithium-ion integrated power supply comprising any one of claims 1 to 9.

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