Balanced battery charging system based on storage reference voltage of memory

Abstract

The utility model discloses an equalized battery charging system based on reference voltage stored by a memory. The equalized battery charging system comprises a charger and a battery pack connected with the charger, the battery pack is formed by connecting a plurality of batteries in series, and each battery is connected with a control circuit in parallel; the control circuit comprises a single-chip microcomputer U1, a pin 8 of the single-chip microcomputer U1 is grounded, a pin 8 of the single-chip microcomputer U1 is grounded, and a pin 5 of the single-chip microcomputer U1 is connected with the positive electrode of the battery. A pin 1, a pin 3 and a pin 5 of the memory U2 are respectively connected with a pin 3, a pin 2 and a pin 4 of the single-chip microcomputer U1, the pin 2 is grounded, and the pin 4 of the memory U2 is connected with the pin 1 of the single-chip microcomputer U1. According to the utility model, the memory is adopted to store reference voltage, after the single-chip microcomputer receives an input voltage signal, the input voltage signal is converted into a digital signal after analog-to-digital change, the digital signal is stored in the memory U2, and after the battery begins to be charged, the collected voltage is compared with the stored reference voltage to judge whether the battery is fully charged or not.

Description

Technical Field

[0001] The utility model relates to the field of lead-acid battery charging, and specifically relates to a balanced battery charging system based on a reference voltage stored in a memory. Background Art

[0002] A storage battery is a device that converts chemical energy into electrical energy and is a rechargeable battery designed according to the principle of rechargeability.

[0003] The charging of the battery is achieved through a reversible chemical reaction, usually referring to a lead-acid battery, which is a common rechargeable battery.

[0004] It is usually composed of multiple single cells, and each single cell includes positive and negative plates, separators, electrolytes, and containers.

[0005] However, with the increase in the number of cycles, due to sulfation and shedding of active substances, the performance of the battery will gradually decline.

[0006] During the charging process of a multi-section lead-acid battery, when charging the battery pack with the same voltage, it is necessary to consider balanced charging of batteries with different capacities. Therefore, it is necessary to propose a charging system for charging the battery pack to complete the on-off of the charging branch when charging, so as to achieve the effect of balanced battery charging, which is a problem that needs to be solved currently. Summary of the Utility Model

[0007] Purpose of the Utility Model: To provide a balanced battery charging system based on a reference voltage stored in a memory to solve the above problems existing in the prior art.

[0008] Technical Solution: A balanced battery charging system based on a reference voltage stored in a memory, comprising:

[0009] A charger and a battery pack connected to the charger;

[0010] The battery pack is formed by connecting multiple batteries in series, and a control circuit is connected in parallel to each battery;

[0011] The control circuit includes:

[0012] A single-chip microcomputer U1, with pin 8 of the single-chip microcomputer U1 grounded, pin 5 connected to the positive electrode of the battery, and the negative electrode of the battery grounded;

[0013] A memory U2, with pins 1, 3, and 5 of the memory U2 respectively connected to pins 3, 2, and 4 of the single-chip microcomputer U1, pin 2 grounded, and pin 4 of the memory U2 connected to pin 1 of the single-chip microcomputer U1 and connected to a 3V power supply.

[0014] In this utility model, a memory is adopted to store the reference voltage. After the single-chip microcomputer receives the input voltage signal, it is converted into a digital signal after analog-to-digital conversion and stored in the memory U2. After the battery starts charging, the collected voltage is compared with the stored reference voltage to determine whether the battery is fully charged. When it is fully charged, switch a disconnects the first charging branch, and switch b turns on the second charging branch to continue charging the subsequent batteries, which can stop charging in time after the battery is fully charged to prevent overcharging, thereby achieving the effect of balanced charging of the battery pack.

[0015] The function of the control circuit is to detect the voltage across a single battery to determine whether the battery reaches the saturation state. If it is detected that the battery reaches saturation, the charging of the battery is disconnected, and at the same time, another path will also be opened to continue charging other batteries.

[0016] In a further embodiment, the control circuit further includes:

[0017] The first charging branch is connected to the negative electrode of the battery, and a switch a is provided on the first charging branch;

[0018] The second charging branch, one end of which is connected to the first charging branch, the other end is connected to the positive electrode of the battery, and a switch b is provided on the second charging branch.

[0019] In a further embodiment, the connection position of the second charging branch and the first charging branch is at the front end of switch a.

[0020] In a further embodiment, when multiple batteries are connected in series, the first charging branch of the first battery and the second charging branch of the last battery are connected to the charger.

[0021] The first charging branches of the remaining batteries are connected to the second charging branch of the previous battery;

[0022] In a further embodiment, switch b is the inverse of switch a.

[0023] In a further embodiment, pin 7 of the single-chip microcomputer U1 is connected to switch a, and the inverted output of pin 7 is connected to switch b.

[0024] The model of the single-chip microcomputer U1 is HC15P121B1;

[0025] The model of the memory U2 is 24C02S.

[0026] Beneficial effects: The utility model discloses a balanced battery charging system based on a memory storing a reference voltage. By using the memory to store the reference voltage, after the single-chip microcomputer receives the input voltage signal, it is converted into a digital signal after analog-to-digital conversion and stored in the memory U2. After the battery starts charging, the collected voltage is compared with the stored reference voltage to determine whether the battery is fully charged. When it is fully charged, switch a disconnects the first charging branch, and switch b turns on the second charging branch to continue charging the subsequent batteries, which can stop charging in time after the battery is fully charged to prevent overcharging, and thus achieve the effect of balanced charging of the battery pack. Brief description of the drawings

[0027] Figure 1 is a schematic structural diagram of the utility model.

[0028] Figure 2 is a schematic structural diagram of the control circuit of the utility model. Detailed implementation manners

[0029] This application relates to a balanced battery charging system based on a memory storing a reference voltage, which will be explained in detail through specific implementation manners below.

[0030] A balanced battery charging system based on a memory storing a reference voltage, comprising:

[0031] a charger and a battery pack connected to the charger;

[0032] The battery pack is formed by connecting multiple batteries in series, and a control circuit is connected in parallel to each battery;

[0033] The control circuit includes:

[0034] a single-chip microcomputer U1, the pin 8 of the single-chip microcomputer U1 is grounded, the pin 5 is connected to the positive electrode of the battery, and the negative electrode of the battery is grounded;

[0035] a memory U2, the pins 1, 3, and 5 of the memory U2 are respectively connected to the pins 3, 2, and 4 of the single-chip microcomputer U1, the pin 2 is grounded, the pin 4 of the memory U2 is connected to the pin 1 of the single-chip microcomputer U1 and connected to a 3V power supply.

[0036] The utility model stores the reference voltage by using the memory. After the single-chip microcomputer receives the input voltage signal, it is converted into a digital signal after analog-to-digital conversion and stored in the memory U2. After the battery starts charging, the collected voltage is compared with the stored reference voltage to determine whether the battery is fully charged. When it is fully charged, switch a disconnects the first charging branch, and switch b turns on the second charging branch to continue charging the subsequent batteries, which can stop charging in time after the battery is fully charged to prevent overcharging, and thus achieve the effect of balanced charging of the battery pack.

[0037] This application is used for the control of a battery charging system. In the equalizing charging of multi-section lead-acid batteries, a corresponding control system is required to control the on / off of the charging branch, so as to stop charging in time after the battery is fully charged and prevent overcharging.

[0038] The present invention can achieve precise control of the circuit. After the battery reaches saturation, the first charging branch is disconnected in time, and the second charging branch is turned on to continue charging other batteries.

[0039] In a further embodiment, the control circuit further includes:

[0040] A first charging branch, connected to the negative electrode of the battery, and a switch a is provided on the first charging branch;

[0041] A second charging branch, one end of which is connected to the first charging branch, and the other end is connected to the positive electrode of the battery, and a switch b is provided on the second charging branch.

[0042] The connection position of the second charging branch and the first charging branch is at the front end of the switch a.

[0043] When multiple batteries are connected in series, the first charging branch of the first battery and the second charging branch of the last battery are connected to the charger.

[0044] The first charging branch of the remaining batteries is connected to the second charging branch of the previous battery;

[0045] The switch b is the inverse of the switch a.

[0046] Pin 7 of the single-chip microcomputer U1 is connected to the switch a, and the inverted output of pin 7 is connected to the switch b.

[0047] The model of the single-chip microcomputer U1 is HC15P121B1;

[0048] The model of the memory U2 is 24C02S.

[0049] Principle description: After the single-chip microcomputer receives the input voltage signal, it is converted into a digital signal after analog-to-digital conversion and stored in the memory U2. After the battery starts charging, the collected voltage is compared with the stored reference voltage to determine whether the battery is fully charged. When it is fully charged, the switch a disconnects the first charging branch, and the switch b turns on the second charging branch to continue charging the subsequent batteries, completing the charging work.

[0050] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various equivalent transformations can be made to the technical solutions of the present utility model, and these equivalent transformations all belong to the protection scope of the present utility model.

Claims

1. A balanced battery charging system based on a memory storing a reference voltage, comprising: A charger, and a battery pack connected to the charger; The invention is characterized in that the battery pack is formed by connecting a plurality of batteries in series, and a control circuit is connected in parallel to each battery; The control circuit comprises: Single chip microcomputer U1, pin 8 of the single chip microcomputer U1 is grounded, pin 5 is connected to the positive electrode of the battery, and the negative electrode of the battery is grounded; Memory U2, pin 1, pin 3, pin 5 of the memory U2 are respectively connected to pin 3, pin 2, pin 4 of the microcontroller U1, pin 2 is grounded, and pin 4 of the memory U2 is connected to pin 1 of the microcontroller U1 and connected to a 3V power supply.

2. The balanced battery charging system based on memory storage reference voltage according to claim 1, characterized in that: The control circuit further comprises: A first charging branch is connected to the negative electrode of the battery and is provided with a switch a; The second charging branch has one end connected to the first charging branch and the other end connected to the positive electrode of the battery, and a switch b is provided on the second charging branch.

3. A balanced battery charging system based on memory storage reference voltage according to claim 2, characterized in that: The connection position between the second charging branch and the first charging branch is located at the front end of the switch a.

4. The balanced battery charging system based on memory storage reference voltage according to claim 3, characterized in that: When multiple batteries are connected in series, the first charging branch of the first battery and the second charging branch of the last battery are connected to the charger.

5. The balanced battery charging system based on memory storage reference voltage according to claim 2, characterized in that: The switch b is the inverse of the switch a.

6. The balanced battery charging system based on memory storage reference voltage according to claim 1, characterized in that: Pin 7 of the single chip microcomputer U1 is connected to switch a, and the output of pin 7 is inverted and connected to switch b.

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