Power battery charging and discharging detection circuit

Abstract

A power battery charging and discharging detection circuit comprises an energy storage base station, a current adapter, a BMS1, a BMS2, a battery pack 1 and a battery pack 2, the energy storage base station is used for providing electric quantity needed by battery charging or recycling discharging electric quantity generated by battery discharging, the current adapter is used for adjusting the magnitude value of voltage and current, the BMS is used for monitoring and protecting the battery, and the battery pack 2 is used for charging the battery. The positive electrode of the battery pack 1 is sequentially connected with the BMS1, the switch K6, the current adapter, the switch K7, the BMS2 and the positive electrode of the battery pack 2; the negative electrode of the battery pack 1 is sequentially connected with the BMS1, the current adapter, the BMS2 and the negative electrode of the battery pack 2; the output end of the BMS1 is sequentially connected with the switch K2, the switch K1 and the positive electrode of the energy storage base station, and the positive electrode of the energy storage base station is sequentially connected with the switch K1, the switch K3 and the input end of the BMS2. The use intensity of the charging and discharging cabinet is reduced, the service life of equipment is prolonged, and the influence of battery pack charging and discharging tests on a power grid is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a power battery charge and discharge detection circuit. Background Art

[0002] Before leaving the factory, automotive power batteries usually need to be tested for charge and discharge cycles with corresponding currents according to the actual use conditions of the vehicle to check and verify whether the relevant performance of the finished battery is reliable. In the general charge and discharge test process, a charge and discharge test device is required to charge or discharge a group of batteries or battery packs to be tested. When charging, the charge and discharge cabinet inputs a certain voltage and current to the battery pack for charging; when discharging, the battery pack releases electrical energy, and the charge and discharge cabinet recycles the released electricity to the power grid. However, a single charge and discharge device only charges or discharges one battery at a time, and the electrical energy needs to interact with the power grid frequently, which has a certain impact on the power grid voltage. In addition, a charge and discharge cabinet only charges or discharges one battery, and there are still batteries waiting to be charged or discharged when running at full load, so the production efficiency is not high and the equipment loss is large. Summary of the invention

[0003] The object of the present invention is to provide a power battery charge and discharge detection circuit, which can effectively solve the technical problems mentioned in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A power battery charge and discharge detection circuit, comprising: An energy storage base station, which is used to provide the power required for battery charging or to recover the discharged power generated by battery discharge; A current adapter, which is used to adjust the magnitude of voltage and current; Two BMSs, respectively denoted as BMS1 and BMS2, the BMSs are used to monitor and protect the battery; Two battery packs, respectively denoted as battery pack 1 and battery pack 2; The positive electrode of the battery pack 1 is connected to the positive electrode of the BMS1, the switch K6, the current adapter, the switch K7, the BMS2 and the battery pack 2 in sequence, and the negative electrode of the battery pack 1 is connected to the negative electrode of the BMS1, the current adapter, the BMS2 and the battery pack 2 in sequence; The output end of the BMS1 is connected to the switch K2, the switch K1 and the positive pole of the energy storage base station in sequence, the positive pole of the energy storage base station is connected to the switch K1, the switch K3 and the input end of the BMS2 in sequence, the negative pole of the energy storage base station is connected to the switch K4, the BMS1 and the negative pole of the battery pack 1 in sequence on one path, and is connected to the switch K5, the BMS2 and the negative pole of the battery pack 2 in sequence on the other path.

[0005] Preferably, when the discharge power of battery pack 1 exceeds the power required for charging battery pack 2, K1 / K2 / K3 / K4 / K5 are disconnected, K6 / K7 are closed, battery pack 1 is discharged, and the current is processed by the current adapter to charge battery #2; After the battery pack 2 is charged, K1 / K2 / K4 are closed and K3 / K5 / K6 / K7 are disconnected. At this time, the battery pack 1 continues to discharge, and its discharged electricity is recovered to the energy storage base station until the discharge of the battery pack 1 is completed.

[0006] Preferably, when the discharged power of battery pack 1 is insufficient to provide the power required for charging battery pack 2, K1 / K2 / K3 / K4 / K5 are disconnected, K6 / K7 are closed, battery pack 1 is discharged, and the current is processed by the current adapter to charge battery pack 2; After battery group 1 is discharged, K1 / K3 / K5 are closed, K2 / K4 / K6 / K7 are disconnected, and battery group 2 continues to charge. Its power is provided by the energy storage base station until the charging of battery group 2 is completed.

[0007] Preferably, the rated current of the power battery charge and discharge detection circuit is 600A.

[0008] Preferably, the rated voltage of the power battery charge and discharge detection circuit is 1500V.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a relatively flexible charging and discharging detection mode for batteries, which improves the conversion utilization rate of electric energy and the production efficiency at the same time; two paired battery packs are charged and discharged simultaneously, and product pairs with the same voltage and charging and discharging current are selected as much as possible to minimize the instability caused by the current size difference; The present invention reduces the use intensity of the charging and discharging cabinet and prolongs the service life of the equipment; avoids the influence of the battery pack charging and discharging test on the power grid, uses the energy storage base station instead of the power grid, makes the power supply and use more flexible, faster, more energy-saving, and improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is shown in the charge and discharge capacity-time curve when the discharge capacity of battery pack 1 exceeds the capacity required for charging of battery pack 2; Figure 3 This is the charge and discharge capacity-time curve when the discharge capacity of battery pack 1 is insufficient to provide the capacity required for charging battery pack 2. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] See also Figure 1 As shown, a power battery charge and discharge detection circuit includes.

[0013] A power battery charge and discharge detection circuit, comprising: An energy storage base station, which is used to provide the power required for battery charging or to recover the discharged power generated by battery discharge; A current adapter, which is used to adjust the magnitude of voltage and current; Two BMSs, respectively denoted as BMS1 and BMS2, the BMSs are used to monitor and protect the battery; Two battery packs, respectively denoted as battery pack 1 and battery pack 2; The positive electrode of the battery pack 1 is connected to the positive electrode of the BMS1, the switch K6, the current adapter, the switch K7, the BMS2 and the battery pack 2 in sequence, and the negative electrode of the battery pack 1 is connected to the negative electrode of the BMS1, the current adapter, the BMS2 and the battery pack 2 in sequence; The output end of the BMS1 is connected to the switch K2, the switch K1 and the positive pole of the energy storage base station in sequence, the positive pole of the energy storage base station is connected to the switch K1, the switch K3 and the input end of the BMS2 in sequence, the negative pole of the energy storage base station is connected to the switch K4, the BMS1 and the negative pole of the battery pack 1 in sequence on one path, and is connected to the switch K5, the BMS2 and the negative pole of the battery pack 2 in sequence on the other path.

[0014] Among them, the rated current of the power battery charge and discharge detection circuit is 600A and the rated voltage is 1500V; Working condition 1: When the discharge power of battery pack 1 exceeds the power required for charging battery pack 2, such as Figure 2 The charge and discharge capacity-time curve shown; Among them, Q1 represents the initial discharge capacity of battery pack 1 (the capacity is represented by voltage value in actual production), Q1' represents the final discharge capacity of battery pack 1; Q2 represents the initial charge capacity of battery pack 2, and Q2' represents the final charge capacity of battery pack 2; In this case, Figure 2 The working action process in the circuit shown is as follows: a. Time period t0→t1: K1 / K2 / K3 / K4 / K5 are disconnected, K6 / K7 are closed, BMS1, BMS2 and current adapter are all in working state, battery pack 1 is discharged, and the current is processed by the current adapter to make its value meet the charging demand of battery pack 2, so battery pack 2 is charged; the current adapter can adjust the voltage and current value; b. Time period t1→t2: K1 / K2 / K4 are closed, K3 / K5 / K6 / K7 are disconnected, BMS1 is working, and the current adapter and BMS2 stop working; at t1, the charging of battery pack 2 is finished, and the discharge of battery pack 1 continues, and its discharged electricity is recovered to the energy storage base station until t2, when the discharge of battery pack 1 is finished.

[0015] Working condition 2: When the discharged power of battery pack 1 is insufficient to provide the power required for charging battery pack 2, such as Figure 3 The charge and discharge capacity-time curve shown; Among them, Q1 represents the initial discharge capacity of battery pack 1 (the capacity is represented by voltage value in actual production), Q1' represents the final discharge capacity of battery pack 1; Q2 represents the initial charge capacity of battery pack 2, and Q2' represents the final charge capacity of battery pack 2.

[0016] In this case, Figure 3 The working action process in the circuit shown is as follows: a. Time period t0→t1: K1 / K2 / K3 / K4 / K5 are disconnected, K6 / K7 are closed, BMS1, BMS2 and current adapter are all in working state, battery pack 1 is discharged, and the current is processed by the current adapter to make its value meet the charging demand of battery pack 2, so battery pack 2 is charged; b. Time period t1→t2: K1 / K3 / K5 are closed, K2 / K4 / K6 / K7 are disconnected, BMS2 is working, and the current adapter and BMS1 are stopped. At t1, the battery pack 1 has finished discharging. At this time, the battery pack 2 needs to continue charging, and its power is provided by the energy storage base station until the battery pack 2 finishes charging at t2; When battery pack 1 is discharged and battery pack 2 is charged, battery pack 1 and battery pack 2 need to be left to stand according to the charging and discharging process standard, and then battery pack 2 is discharged and battery pack 1 is charged, so as to achieve a complete charging and discharging cycle; In this circuit structure, battery pack 1 and battery pack 2 are in an equally symmetrical position, and the situation in which battery pack 2 is discharged while battery pack 1 is charged is completely the same as the above two situations.

[0017] The present invention provides a relatively flexible charging and discharging detection mode for batteries, which improves the conversion utilization rate of electric energy and the production efficiency at the same time; two paired battery packs are charged and discharged simultaneously, and product pairs with the same voltage and charging and discharging current are selected as much as possible to minimize the instability caused by the current size difference; The present invention reduces the use intensity of the charging and discharging cabinet and prolongs the service life of the equipment; avoids the influence of the battery pack charging and discharging test on the power grid, uses the energy storage base station instead of the power grid, makes the power supply and use more flexible, faster, more energy-saving, and improves the production efficiency.

[0018] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A power battery charge and discharge detection circuit, characterized in that: include: An energy storage base station, which is used to provide the power required for battery charging or to recover the discharged power generated by battery discharge; A current adapter, which is used to adjust the magnitude of voltage and current; Two BMSs, respectively denoted as BMS1 and BMS2, the BMSs are used to monitor and protect the battery; Two battery packs, respectively denoted as battery pack 1 and battery pack 2; The positive electrode of the battery pack 1 is connected to the positive electrode of the BMS1, the switch K6, the current adapter, the switch K7, the BMS2 and the battery pack 2 in sequence, and the negative electrode of the battery pack 1 is connected to the negative electrode of the BMS1, the current adapter, the BMS2 and the battery pack 2 in sequence; The output end of the BMS1 is connected to the switch K2, the switch K1 and the positive pole of the energy storage base station in sequence, the positive pole of the energy storage base station is connected to the switch K1, the switch K3 and the input end of the BMS2 in sequence, the negative pole of the energy storage base station is connected to the switch K4, the BMS1 and the negative pole of the battery pack 1 in sequence on one path, and is connected to the switch K5, the BMS2 and the negative pole of the battery pack 2 in sequence on the other path.

2. A power battery charge and discharge detection circuit according to claim 1, characterized in that: When the discharge power of battery group 1 exceeds the power required for charging battery group 2, K1 / K2 / K3 / K4 / K5 are disconnected, K6 / K7 are closed, battery group 1 is discharged, and the current is processed by the current adapter to charge battery 2#; After the battery pack 2 is charged, K1 / K2 / K4 are closed and K3 / K5 / K6 / K7 are disconnected. At this time, the battery pack 1 continues to discharge, and its discharged electricity is recovered to the energy storage base station until the discharge of the battery pack 1 is completed.

3. A power battery charge and discharge detection circuit according to claim 1, characterized in that: When the discharged power of battery pack 1 is insufficient to provide the power required for charging battery pack 2, K1 / K2 / K3 / K4 / K5 are disconnected, K6 / K7 is closed, battery pack 1 is discharged, and the current is processed by the current adapter to charge battery pack 2; After battery group 1 is discharged, K1 / K3 / K5 are closed, K2 / K4 / K6 / K7 are disconnected, and battery group 2 continues to charge. Its power is provided by the energy storage base station until the charging of battery group 2 is completed.

4. A power battery charge and discharge detection circuit according to claim 1, characterized in that: The rated current of the power battery charge and discharge detection circuit is 600A.

5. A power battery charge and discharge detection circuit according to claim 2, characterized in that: The rated voltage of the power battery charge and discharge detection circuit is 1500V.

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