Intelligent charging equalization circuit

Abstract

The utility model discloses an intelligent charging equalization circuit, and belongs to the technical field of battery charging. Comprising an AC converter, an input end of the AC converter is connected with commercial power, an output end of the AC converter is connected with a power supply input end of a DC switching unit, a charging output end of the DC switching unit is connected with a to-be-charged battery pack, and the power supply input end of the DC switching unit is connected with a discharge resistor through a controllable relay; the system further comprises an upper computer, the upper computer is in communication connection with the controllable relay and the alternating current converter at the same time, and the direct current exchange unit, the alternating current converter and the controllable relay are controlled through the upper computer. According to the utility model, the upper computer is used for judging whether an equalization instruction is valid or not and judging whether a battery needs to be awakened or not, the upper computer is used for detecting the number of battery packs, if the number of the battery packs is inconsistent, an alarm is given and detection is ended, otherwise, a battery pack charging state is entered, the battery packs in the battery pack are charged, and after charging is completed, the battery pack is awakened. And the battery pack voltage in the battery pack is kept consistent.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery charging, and in particular relates to an intelligent charging equalization circuit. Background Art

[0002] A battery pack is a power system composed of multiple individual batteries connected in series and in parallel. In practical applications, battery packs usually need to be equipped with a battery management system (BMS) to ensure the safe operation of the battery pack, including functions such as preventing overcharge, over discharge, temperature control, and battery balancing.

[0003] However, the physical differences of single cells during the manufacturing process and the different internal and external environments during use lead to poor consistency of single cells. Therefore, it is necessary to use a battery balancing circuit to adjust it to maintain the capacity of the battery pack. However, the existing balancing circuits mostly use high voltage to charge the battery packs connected in series, which cannot achieve the purpose of balancing the batteries. Alternatively, multiple battery packs are removed one by one to achieve independent charging of a single battery pack. This charging method not only increases maintenance costs, but also has low charging efficiency. Utility Model Content

[0004] Purpose of the utility model: to provide an intelligent charging equalization circuit to solve the above problems existing in the prior art.

[0005] Technical solution: An intelligent charging equalization circuit includes an AC converter, wherein the input end of the AC converter is connected to the mains, the output end of the AC converter is connected to the power supply input end of a DC switch group, the charging output end of the DC switch group is connected to a battery group to be charged, and the power supply input end of the DC switch group is connected to a discharge resistor through a controllable relay;

[0006] It also includes a host computer, which is communicatively connected to the controllable relay and the AC converter at the same time, and is used to control the DC switch group, the AC switch and the controllable relay.

[0007] Preferably, the DC exchange group includes a plurality of DC exchangers, which are connected in parallel with each other. The battery group includes a plurality of battery packs. The number of the DC exchangers is the same as the number of the battery packs and they are connected one-to-one. The charging output end of each battery pack is connected to the charging end of the corresponding DC exchanger.

[0008] Preferably, the DC converter is an isolated DC converter.

[0009] Preferably, a relay is installed between each battery pack and the DC converter to which it is connected, and the relay is connected to the host computer control, and each group of relays is opened at an interval of 0.5s.

[0010] Preferably, when the voltage difference between the total pressure of a single battery pack in the battery pack and the maximum total pressure of a single battery pack in the battery pack is greater than 50mv, the host computer controls the DC switch group to charge the battery pack; when the maximum voltage difference between the total pressure of a single battery pack in the battery pack and the minimum voltage difference between the total pressure of a single battery pack in the battery pack is less than 40mv, the host computer controls the DC switch group to stop charging the battery pack.

[0011] Preferably, the AC converter adopts an S-1500-110 model AC converter, the controllable relay adopts an HFE82V-20 / 750-24-H model controllable relay, and the host computer adopts an industrial computer integrated touch screen capacitive screen.

[0012] Beneficial effect: The utility model relates to an intelligent charging equalization circuit, which uses a host computer to determine whether a balancing instruction is valid to determine whether the battery needs to be awakened, and uses the host computer to detect the number of battery packs. If the number of battery packs does not match, an alarm is triggered and the detection is ended. Otherwise, the battery pack charging state is entered, the battery pack is awakened, and a controllable relay is opened to charge the battery pack in the battery pack. After charging is completed, the battery pack voltage in the battery pack remains consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a block diagram of the equalizing circuit system of the utility model. DETAILED DESCRIPTION

[0014] like Figure 1As shown, the utility model provides a technical solution: an intelligent charging equalization circuit, including an AC converter, a battery pack, a controllable relay, a discharge resistor, a host computer and a DC switch group, the AC converter adopts an AC converter of the S-1500-110 model, the DC switch adopts an isolated DC converter of the PV75-2YB24R3 model, the controllable relay adopts a controllable relay of the HFE82V-20 / 750-24-H model, the host computer adopts an industrial computer integrated touch screen capacitive screen, wherein the input end of the AC converter is connected to the mains, the output end of the AC converter is connected to the power supply input end of the DC switch group, and the charging of the DC switch group The electrical output end is connected to the battery pack to be charged, and under the action of the AC converter, the DC exchange group is energized, wherein the DC exchange group includes a plurality of DC converters, the DC converters are isolated DC converters, the DC converters are connected in parallel with each other, the battery pack includes a plurality of battery packs, the number of the DC converters is the same as the number of the battery packs and they are connected one-to-one, the charging output end of each battery pack is connected to the charging end of the corresponding DC converter, in this embodiment, 10 groups of battery packs and 10 groups of DC converters are used, the charging output of the DC converter is electrically connected to the positive and negative ends of the battery pack, the battery pack is charged through the DC converter, and the voltage of each battery pack is kept consistent. The power supply input end of each group of the DC converters, that is, the busbar of each group of DC converters, is connected to the discharge resistor through a controllable relay. With the cooperation of the controllable relay and the discharge resistor, when the battery pack balanced target voltage in the battery group is lower than the actual voltage, the battery is discharged to a voltage close to the target voltage through discharge resistors. The host computer is connected to the AC converter, the DC switch group and the controllable relay through a communication board, and the communication board controls the communication between the AC converter, the DC switch group and the controllable relay.

[0015] In a further embodiment, a relay is further installed between each battery pack and the DC converter, and a predetermined voltage is written by the host computer, and it is identified whether the target voltage is within a predetermined range to determine whether the balancing instruction is valid. When the balancing instruction is valid, the optical coupling circuit is used to wake up the battery pack power circuit, and the battery wake-up signal can be turned on. Otherwise, it waits;

[0016] When the battery wake-up signal is turned on, the host computer cooperates with the communication board to determine whether the battery pack is lost. If the battery pack is lost, an alarm is triggered and the battery wake-up is terminated, and the system enters the waiting state.

[0017] If the battery pack is complete, the host computer is used to obtain the voltage of each battery pack. If the voltage difference between the battery pack with the highest voltage and the battery pack with the lowest voltage is greater than 80mv, the relay between the battery pack and the DC converter is turned on. The relays on each battery pack are turned on in sequence, with an interval of 0.5s between each relay. When the relays on each battery pack are all turned on and loaded, the controllable relay is turned on to charge the battery pack.

[0018] If the voltage difference between the total voltage of a single battery pack in the battery pack and the maximum total voltage of a single battery pack in the battery pack is greater than 50mv, the host computer controls the DC switch group to charge the battery pack through the communication board, and the charging current can be set according to the battery characteristics;

[0019] If the maximum total voltage difference of a single battery pack in the battery pack and the minimum total voltage difference of a single battery pack in the battery pack are less than 40mv, the host computer controls the DC switch group to stop charging the battery pack.

[0020] If the voltage difference between the battery pack with the highest voltage and the battery pack with the lowest voltage is less than or equal to 80mv, it is necessary to compare the total voltage of a single battery pack with the voltage of the balancing target. When the total voltage of a single battery pack is greater than the balancing target voltage*4+200mV and discharge is allowed, the relay can be controlled to close and discharge the total circuit. When the total voltage of a single battery pack is less than the balancing target voltage*4+40mV or discharge is not allowed, the relay can be controlled to disconnect and suspend discharge. When the total voltage of a single battery pack is less than the balancing target voltage*4-200mV and charging is allowed, the host computer controls the AC converter to charge the total circuit through the communication board. When the total voltage of a single battery pack is greater than the balancing target voltage*4-40mV or charging is not allowed, the host computer controls the AC converter to stop power output through the communication board.

[0021] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. An intelligent charging equalization circuit, characterized in that: It includes an AC converter, the input end of the AC converter is connected to the mains, the output end of the AC converter is connected to the power supply input end of the DC switch group, the charging output end of the DC switch group is connected to the battery group to be charged, and the power supply input end of the DC switch group is connected to the discharge resistor through a controllable relay; It also includes a host computer, which is communicatively connected to the controllable relay and the AC converter at the same time, and is used to control the DC switch group, the AC switch and the controllable relay.

2. The intelligent charging equalization circuit according to claim 1, characterized in that: The DC exchange group includes a plurality of DC exchangers, which are connected in parallel with each other. The battery group includes a plurality of battery packs. The number of the DC exchangers is the same as the number of the battery packs and they are connected one-to-one. The charging output end of each battery pack is connected to the charging end of the corresponding DC exchanger.

3. The intelligent charging equalization circuit according to claim 2, characterized in that: The DC converter is an isolated DC converter.

4. The intelligent charging equalization circuit according to claim 2, characterized in that: A relay is also installed between each battery pack and the DC converter connected thereto. The relay is connected to the host computer control, and each group of relays is opened at an interval of 0.5s.

5. The intelligent charging equalization circuit according to claim 2, characterized in that: When the voltage difference between the total pressure of a single battery pack in the battery pack and the maximum total pressure of a single battery pack in the battery pack is greater than 50mv, the host computer controls the DC switch group to charge the battery pack; when the maximum voltage difference between the total pressure of a single battery pack in the battery pack and the minimum voltage difference between the total pressure of a single battery pack in the battery pack is less than 40mv, the host computer controls the DC switch group to stop charging the battery pack.

6. The intelligent charging equalization circuit according to claim 1, characterized in that: The AC converter adopts the S-1500-110 model AC converter, the controllable relay adopts the HFE82V-20 / 750-24-H model controllable relay, and the host computer adopts an industrial computer integrated touch screen capacitive screen.

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