Energy storage battery towing test system and method

Abstract

The present invention provides a system and method for testing energy storage batteries in the field of energy storage battery testing technology. The system includes a host computer, a middle computer, a pair of tow test units, an energy storage unit, a third circuit breaker, a fourth circuit breaker, a distribution transformer and a load; the energy storage unit includes a second circuit breaker, a third isolation transformer, a third energy storage converter and a third energy storage battery; one end of the middle computer is connected to the host computer, and the other end is connected to the pair of tow test unit, the third energy storage converter, the third energy storage battery and the load; the distribution transformer is respectively connected to the pair of tow test unit, the second circuit breaker, the third circuit breaker and the fourth circuit breaker; the third energy storage battery, the third energy storage converter, the third isolation transformer and the second circuit breaker are connected in sequence; the third circuit breaker is connected to the load. The advantages of the present invention are: the efficiency, scalability and safety of energy storage battery testing are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery testing, and in particular to a system and method for testing energy storage batteries. Background Art

[0002] With the development of the energy storage industry, energy storage batteries play an important role in new power systems. They are widely used in power energy storage, household energy storage, industrial manufacturing, user energy storage, microgrids and other fields. In order to ensure the reliability of energy storage batteries, it is necessary to perform charge and discharge tests on energy storage batteries. There are traditionally two methods for testing energy storage batteries:

[0003] Method 1: Connect to the grid, charge the energy storage battery with electricity from the grid, and discharge the energy storage battery with the factory load, but the scalability of this method is greatly limited. Method 2: Use two groups of energy storage batteries to offset each other during the test, but pre-processing is required before the test, that is, use electricity from the grid to charge one group of energy storage batteries and discharge the other group of energy storage batteries.

[0004] Both method 1 and method 2 require electricity to be drawn from the grid. When the original grid-connected transformer cannot meet the power demand of the energy storage battery charging test, the test efficiency is low. If the capacity is expanded, the test cost will increase. Moreover, during the energy storage battery discharge test, the test efficiency is low due to the power demand of the grid-connected transformer load, and there is a risk of backfeeding electricity to the grid.

[0005] Therefore, how to provide a system and method for testing energy storage batteries to improve the efficiency, scalability and safety of energy storage battery testing has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a system and method for testing a pair of energy storage batteries, so as to improve the efficiency, scalability and safety of the energy storage battery testing.

[0007] In a first aspect, the present invention provides an energy storage battery pair-drag test system, comprising a host computer, a middle computer, a pair-drag test unit, an energy storage unit, a third circuit breaker, a fourth circuit breaker, a distribution transformer and a load;

[0008] The energy storage unit includes a second circuit breaker, a third isolation transformer, a third energy storage converter and a third energy storage battery;

[0009] One end of the intermediate machine is connected to the upper computer, and the other end is connected to the towing test unit, the third energy storage inverter, the third energy storage battery and the load; the distribution transformer is respectively connected to the towing test unit, the second circuit breaker, the third circuit breaker and the fourth circuit breaker; the third energy storage battery, the third energy storage inverter, the third isolation transformer and the second circuit breaker are connected in sequence; the third circuit breaker is connected to the load.

[0010] Further, the towing test unit includes a first circuit breaker, a first isolation transformer, a second isolation transformer, a first energy storage converter, a second energy storage converter, a first energy storage battery and a second energy storage battery;

[0011] The first energy storage battery, the first energy storage converter, the first isolation transformer and the first circuit breaker are connected in sequence; the second energy storage battery, the second energy storage converter, the second isolation transformer and the first circuit breaker are connected in sequence;

[0012] The first energy storage converter, the second energy storage converter, the first energy storage battery and the second energy storage battery are all connected to the intermediate machine.

[0013] Furthermore, it also includes a display, an indicator light and a fire controller;

[0014] The display, indicator light and fire controller are all connected to the host computer.

[0015] Furthermore, the display is a touch display.

[0016] Furthermore, the indicator light is a three-color indicator light.

[0017] In a second aspect, the present invention provides a method for testing a pair of energy storage batteries, comprising the following steps:

[0018] Step S1, the host computer sets a first SOC threshold, a second SOC threshold and a static time, wherein the second SOC threshold is greater than the first SOC threshold;

[0019] Step S2: The upper computer controls the third energy storage battery of the energy storage unit to charge through the intermediate computer based on the peak-shaving and valley-filling strategy;

[0020] Step S3, adjusting the SOC value of the first energy storage battery to the second SOC threshold value through the third energy storage battery, adjusting the SOC value of the second energy storage battery to the first SOC threshold value, and leaving it still for the said resting time;

[0021] Step S4, controlling the second energy storage battery of the towing test unit to charge the first energy storage battery, adjusting the SOC value of the first energy storage battery to 100%, adjusting the SOC value of the second energy storage battery to 0%, and leaving it to stand for the said standing time;

[0022] Step S5, controlling the first energy storage battery of the towing test unit to charge the second energy storage battery, adjusting the SOC value of the second energy storage battery to 100%, adjusting the SOC value of the first energy storage battery to 0%, and leaving it to stand for the said standing time;

[0023] Step S6, controlling the second energy storage battery of the towing test unit to charge the first energy storage battery, adjusting the SOC value of the first energy storage battery to 100%, adjusting the SOC value of the second energy storage battery to 0%, and leaving it to stand for the said standing time;

[0024] Step S7, controlling the first energy storage battery of the towing test unit to charge the second energy storage battery, so that the SOC value of the second energy storage battery is adjusted to the first SOC threshold, the SOC value of the first energy storage battery is adjusted to the second SOC threshold, and the two batteries are left standing for the said standing time;

[0025] Step S8: Control the first energy storage battery to charge the third energy storage battery, so that the SOC value of the first energy storage battery is adjusted from the second SOC threshold to the first SOC threshold to complete the towing test.

[0026] Furthermore, in step S1, the value of the first SOC threshold is 30%.

[0027] Furthermore, in step S1, the value of the second SOC threshold is 70%.

[0028] The advantages of the present invention are:

[0029] 1. By setting up a pair test unit and an energy storage unit, the energy storage unit is charged and discharged based on the peak elimination and valley filling strategy before the test. When preparing for the test, the SOC values ​​of the first energy storage battery and the second energy storage battery of the pair test unit are set to an initial state through the energy storage unit. During the test, the first energy storage battery and the second energy storage battery are charged and discharged with each other, without the need to draw power from the grid side, and there is no risk of backfeeding power to the grid. The SOC threshold can be flexibly set, and the load connected to the third circuit breaker can be directly discharged without using the plant load, thereby greatly improving the efficiency, scalability and safety of the energy storage battery test.

[0030] 2. The energy storage unit is charged and discharged based on the peak-shaving and valley-filling strategy, effectively reducing the cost of energy storage battery testing.

[0031] 3. The safety of energy storage battery testing is further improved by setting the display to display the operating data of the test system, setting the indicator light to indicate the working status of the test system, and setting the fire controller to link the thermal runaway during the fire application test.

[0032] 4. By setting the display to a touch display, the convenience of operating the test system is greatly improved.

[0033] 5. By setting the resting time, the energy storage battery will be kept at rest based on the resting time in each test phase, which effectively improves the accuracy of the energy storage battery test. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0035] Figure 1 The invention discloses a circuit principle block diagram of an energy storage battery towing test system.

[0036] Figure 2 The present invention is a flow chart of a method for testing a pair of energy storage batteries. DETAILED DESCRIPTION

[0037] The technical solution in the embodiment of the present application has the following general idea: a towing test unit and an energy storage unit are set, and when preparing for testing, the SOC values ​​of the first energy storage battery and the second energy storage battery of the towing test unit are set to an initial state through the energy storage unit. During the test, the first energy storage battery and the second energy storage battery are charged and discharged with each other, without the need to draw power from the grid side, and the SOC threshold can be flexibly set. The load connected to the third circuit breaker can be directly discharged without using the plant load, so as to improve the efficiency, scalability and safety of the energy storage battery test.

[0038] Please refer to Figure 1 to Figure 2 As shown, a preferred embodiment of the energy storage battery pair test system of the present invention includes a host computer, a middle computer, a pair test unit, an energy storage unit, a third circuit breaker, a fourth circuit breaker, a distribution transformer and a load; the host computer is used to control the operation of the test system; the middle computer is used to execute the test instructions of the host computer; the pair test unit is used for pair test of the first energy storage battery and the second energy storage battery; the energy storage unit is used to reduce the peak and fill the valley to reduce the electricity cost, and adjust the SOC value of the first energy storage battery and the second energy storage battery; the third circuit breaker is used to switch on and off the load; the fourth circuit breaker is used to switch on and off the power grid; the distribution transformer is used to distribute the electricity input from the power grid; the load is used to consume the electric energy released by the pair test unit and the energy storage unit;

[0039] The energy storage unit includes a second circuit breaker, a third isolation transformer, a third energy storage converter and a third energy storage battery;

[0040] One end of the intermediate machine is connected to the upper computer, and the other end is connected to the towing test unit, the third energy storage inverter, the third energy storage battery and the load; the distribution transformer is respectively connected to the towing test unit, the second circuit breaker, the third circuit breaker and the fourth circuit breaker; the third energy storage battery, the third energy storage inverter, the third isolation transformer and the second circuit breaker are connected in sequence; the third circuit breaker is connected to the load.

[0041] The towing test unit includes a first circuit breaker, a first isolation transformer, a second isolation transformer, a first energy storage converter, a second energy storage converter, a first energy storage battery and a second energy storage battery;

[0042] The first energy storage battery, the first energy storage converter, the first isolation transformer and the first circuit breaker are connected in sequence; the second energy storage battery, the second energy storage converter, the second isolation transformer and the first circuit breaker are connected in sequence;

[0043] The first energy storage converter, the second energy storage converter, the first energy storage battery and the second energy storage battery are all connected to the intermediate machine.

[0044] It also includes a display, an indicator light and a fire controller;

[0045] The display, indicator light and fire controller are all connected to the host computer.

[0046] The display is a touch display. By setting the display as a touch display, the convenience of controlling the test system is greatly improved.

[0047] The indicator light is a three-color indicator light.

[0048] By setting the display to display the operating data of the test system, setting the indicator light to indicate the working status of the test system, and setting the fire controller to link thermal runaway during the fire application test, the safety of the energy storage battery test is further improved.

[0049] A preferred embodiment of a method for testing a towing energy storage battery of the present invention comprises the following steps:

[0050] Step S1, the host computer sets a first SOC threshold, a second SOC threshold and a rest time, wherein the second SOC threshold is greater than the first SOC threshold; by setting the rest time, the energy storage battery in each test link is rested based on the rest time, thereby effectively improving the accuracy of the energy storage battery test;

[0051] Step S2: The upper computer controls the third energy storage battery of the energy storage unit to charge through the intermediate computer based on the peak-shaving and valley-filling strategy;

[0052] Step S3, adjusting the SOC value of the first energy storage battery to the second SOC threshold value through the third energy storage battery, adjusting the SOC value of the second energy storage battery to the first SOC threshold value, and leaving it still for the said resting time;

[0053] Step S4, controlling the second energy storage battery of the towing test unit to charge the first energy storage battery, adjusting the SOC value of the first energy storage battery to 100%, adjusting the SOC value of the second energy storage battery to 0%, and leaving it to stand for the said standing time;

[0054] Step S5, controlling the first energy storage battery of the towing test unit to charge the second energy storage battery, adjusting the SOC value of the second energy storage battery to 100%, adjusting the SOC value of the first energy storage battery to 0%, and leaving it to stand for the said standing time;

[0055] Step S6, controlling the second energy storage battery of the towing test unit to charge the first energy storage battery, adjusting the SOC value of the first energy storage battery to 100%, adjusting the SOC value of the second energy storage battery to 0%, and leaving it to stand for the said standing time;

[0056] Step S7, controlling the first energy storage battery of the towing test unit to charge the second energy storage battery, so that the SOC value of the second energy storage battery is adjusted to the first SOC threshold, the SOC value of the first energy storage battery is adjusted to the second SOC threshold, and the two batteries are left standing for the said standing time;

[0057] Step S8, control the first energy storage battery to charge the third energy storage battery, so that the SOC value of the first energy storage battery is adjusted from the second SOC threshold to the first SOC threshold, so as to complete the towing test. That is, the first energy storage battery and the second energy storage battery offset each other, and the tests of the two groups of energy storage batteries are completed at the same time, so as to improve the test efficiency, and the grid and load do not need to intervene during the test.

[0058] In the step S1, the first SOC threshold is set to 30%.

[0059] In the step S1, the second SOC threshold is set to 70%, and the rest time is 30 minutes.

[0060] In summary, the advantages of the present invention are:

[0061] 1. By setting up a pair test unit and an energy storage unit, the energy storage unit is charged and discharged based on the peak elimination and valley filling strategy before the test. When preparing for the test, the SOC values ​​of the first energy storage battery and the second energy storage battery of the pair test unit are set to an initial state through the energy storage unit. During the test, the first energy storage battery and the second energy storage battery are charged and discharged with each other, without the need to draw power from the grid side, and there is no risk of backfeeding power to the grid. The SOC threshold can be flexibly set, and the load connected to the third circuit breaker can be directly discharged without using the plant load, thereby greatly improving the efficiency, scalability and safety of the energy storage battery test.

[0062] 2. The energy storage unit is charged and discharged based on the peak-shaving and valley-filling strategy, effectively reducing the cost of energy storage battery testing.

[0063] 3. The safety of energy storage battery testing is further improved by setting the display to display the operating data of the test system, setting the indicator light to indicate the working status of the test system, and setting the fire controller to link the thermal runaway during the fire application test.

[0064] 4. By setting the display to a touch display, the convenience of operating the test system is greatly improved.

[0065] 5. By setting the resting time, the energy storage battery will be kept at rest based on the resting time in each test phase, which effectively improves the accuracy of the energy storage battery test.

[0066] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A storage battery towing test system, characterized by: It includes a host computer, a middle computer, a pair of drag test units, an energy storage unit, a third circuit breaker, a fourth circuit breaker, a distribution transformer and a load; The energy storage unit includes a second circuit breaker, a third isolation transformer, a third energy storage converter and a third energy storage battery; One end of the intermediate machine is connected to the upper computer, and the other end is connected to the towing test unit, the third energy storage inverter, the third energy storage battery and the load; the distribution transformer is respectively connected to the towing test unit, the second circuit breaker, the third circuit breaker and the fourth circuit breaker; the third energy storage battery, the third energy storage inverter, the third isolation transformer and the second circuit breaker are connected in sequence; the third circuit breaker is connected to the load.

2. The energy storage battery towing test system according to claim 1, characterized in that: The towing test unit includes a first circuit breaker, a first isolation transformer, a second isolation transformer, a first energy storage converter, a second energy storage converter, a first energy storage battery and a second energy storage battery; The first energy storage battery, the first energy storage converter, the first isolation transformer and the first circuit breaker are connected in sequence; the second energy storage battery, the second energy storage converter, the second isolation transformer and the first circuit breaker are connected in sequence; The first energy storage converter, the second energy storage converter, the first energy storage battery and the second energy storage battery are all connected to the intermediate machine.

3. The energy storage battery towing test system according to claim 1, characterized in that: It also includes a display, an indicator light and a fire controller; The display, indicator light and fire controller are all connected to the host computer.

4. The energy storage battery towing test system according to claim 3, characterized in that: The display is a touch display.

5. The energy storage battery towing test system according to claim 3, characterized in that: The indicator light is a three-color indicator light.

6. A method for testing energy storage batteries, characterized in that: The method requires the use of a test system as described in any one of claims 1 to 5, comprising the following steps: Step S1, the host computer sets a first SOC threshold, a second SOC threshold and a static time, wherein the second SOC threshold is greater than the first SOC threshold; Step S2: The upper computer controls the third energy storage battery of the energy storage unit to charge through the intermediate computer based on the peak-shaving and valley-filling strategy; Step S3, adjusting the SOC value of the first energy storage battery to the second SOC threshold value through the third energy storage battery, adjusting the SOC value of the second energy storage battery to the first SOC threshold value, and leaving it still for the rest time; Step S4, controlling the second energy storage battery of the towing test unit to charge the first energy storage battery, adjusting the SOC value of the first energy storage battery to 100%, adjusting the SOC value of the second energy storage battery to 0%, and leaving it to stand for the said standing time; Step S5, controlling the first energy storage battery of the towing test unit to charge the second energy storage battery, adjusting the SOC value of the second energy storage battery to 100%, adjusting the SOC value of the first energy storage battery to 0%, and leaving it to stand for the said standing time; Step S6, controlling the second energy storage battery of the towing test unit to charge the first energy storage battery, adjusting the SOC value of the first energy storage battery to 100%, adjusting the SOC value of the second energy storage battery to 0%, and leaving it to stand for the said standing time; Step S7, controlling the first energy storage battery of the towing test unit to charge the second energy storage battery, so that the SOC value of the second energy storage battery is adjusted to the first SOC threshold, the SOC value of the first energy storage battery is adjusted to the second SOC threshold, and the two batteries are left standing for the said standing time; Step S8: Control the first energy storage battery to charge the third energy storage battery, so that the SOC value of the first energy storage battery is adjusted from the second SOC threshold to the first SOC threshold to complete the towing test.

7. A method for testing the energy storage battery pairing according to claim 6, characterized in that: In the step S1, the first SOC threshold is set to 30%.

8. A method for testing the energy storage battery pairing according to claim 6, characterized in that: In the step S1, the second SOC threshold is set to 70%.

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