Lithium battery equalization controller

Abstract

The utility model discloses a lithium battery equalization controller, which comprises a lithium battery B1, a lithium battery B2, a lithium battery B3 and a lithium battery B4 which are sequentially connected in series, and further comprises a first lithium battery voltage-sharing unit, the first lithium battery voltage-sharing unit comprises a resistor R1, a voltage-limiting diode D1, an MOS tube P1 and a winding W1, a common end between the resistor R1 and a positive electrode of the voltage-limiting diode D1 is connected with a negative electrode of the lithium battery B1, and a common end between the resistor R1 and a negative electrode of the voltage-limiting diode D1 is connected with a negative electrode of the lithium battery B4. The common end between the resistor R1 and the negative electrode of the voltage limiting diode D1 is connected to the grid electrode of the MOS tube P1, the drain electrode of the MOS tube P1 is connected to one end of the winding W1, and the other end of the winding W1 is connected to the positive electrode of the lithium battery B1. The lithium battery equalization controller disclosed by the utility model has the beneficial effects that the lithium battery equalization controller comprises a plurality of lithium battery voltage-sharing units, and each lithium battery voltage-sharing unit respectively controls the lithium battery, so that when the MOS tube P1, the MOS tube P2, the MOS tube P3 and the MOS tube P4 are synchronously switched on or switched off, the end voltage of each lithium battery is kept consistent.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and in particular relates to a lithium battery equalization controller. Background Art

[0002] The publication number is CN212086771U, the subject name is a utility model patent for a lithium battery balancing controller, and its IPC classification numbers are H05K7 / 20 and H01M10 / 42. Its technical solution discloses "including a balancing controller body 1, a heat dissipation device 2 is provided inside one end of the balancing controller body 1, and the heat dissipation device 2 is provided to facilitate starting the heat dissipation fan 16, drawing in external air through the heat dissipation tube 3, and absorbing dust and moisture in the air through the filter 11, filter cloth 12 and filter cotton 13, thereby ensuring the heat dissipation and cleanliness inside the balancing controller 1 and improving the service life of the balancing controller body 1."

[0003] However, the above utility model patent only discloses one mechanical structure of the lithium battery equalization controller, and does not further extend to the circuit structure, which needs to be further improved. Utility Model Content

[0004] The utility model aims at the existing technical situation, overcomes the above defects and provides a lithium battery equalization controller.

[0005] The utility model adopts the following technical solution. The lithium battery equalization controller includes lithium battery B1, lithium battery B2, lithium battery B3 and lithium battery B4 connected in series in sequence, and also includes:

[0006] A first lithium battery voltage balancing unit, the first lithium battery voltage balancing unit includes a resistor R1, a voltage limiting diode D1, a MOS transistor P1 and a winding W1, the common end between the resistor R1 and the positive electrode of the voltage limiting diode D1 is connected to the negative electrode of the lithium battery B1, the common end between the resistor R1 and the negative electrode of the voltage limiting diode D1 is connected to the gate of the MOS transistor P1, the drain of the MOS transistor P1 is connected to one end of the winding W1, and the other end of the winding W1 is connected to the positive electrode of the lithium battery B1;

[0007] A second lithium battery voltage balancing unit, the second lithium battery voltage balancing unit includes a resistor R2, a voltage limiting diode D2, a MOS tube P2 and a winding W2, the common end between the resistor R2 and the positive electrode of the voltage limiting diode D2 is connected to the negative electrode of the lithium battery B2, the common end between the resistor R2 and the negative electrode of the voltage limiting diode D2 is connected to the gate of the MOS tube P2, the drain of the MOS tube P2 is connected to one end of the winding W2, and the other end of the winding W2 is connected to the positive electrode of the lithium battery B2;

[0008] The third lithium battery voltage balancing unit includes a resistor R3, a voltage limiting diode D3, a MOS tube P3 and a winding W3. The common end between the resistor R3 and the positive electrode of the voltage limiting diode D3 is connected to the negative electrode of the lithium battery B3, the common end between the resistor R3 and the negative electrode of the voltage limiting diode D3 is connected to the gate of the MOS tube P3, the drain of the MOS tube P3 is connected to one end of the winding W3, and the other end of the winding W3 is connected to the positive electrode of the lithium battery B3;

[0009] The fourth lithium battery voltage balancing unit includes a resistor R4, a voltage limiting diode D4, a MOS tube P4 and a winding W4. The common end between the resistor R4 and the positive electrode of the voltage limiting diode D4 is connected to the negative electrode of the lithium battery B4, the common end between the resistor R4 and the negative electrode of the voltage limiting diode D4 is connected to the gate of the MOS tube P4, the drain of the MOS tube P4 is connected to one end of the winding W4, and the other end of the winding W4 is connected to the positive electrode of the lithium battery B4.

[0010] As a further preferred technical solution of the above technical solution, the second lithium battery voltage equalizing unit further includes a capacitor C1, one end of the capacitor C1 is connected to the gate of the MOS tube P1, and the other end of the capacitor C1 is connected to the gate of the MOS tube P2.

[0011] As a further preferred technical solution of the above technical solution, the third lithium battery voltage equalizing unit further includes a capacitor C2, one end of the capacitor C2 is connected to the gate of the MOS tube P2, and the other end of the capacitor C2 is connected to the gate of the MOS tube P3.

[0012] As a further preferred technical solution of the above technical solution, the fourth lithium battery voltage equalizing unit further includes a capacitor C3, one end of the capacitor C3 is connected to the gate of the MOS tube P3, and the other end of the capacitor C3 is connected to the gate of the MOS tube P4.

[0013] As a further preferred technical solution of the above technical solution, the lithium battery balancing controller also includes a plug-in board J1, a transistor Q1 and a transistor Q2, the base of the transistor Q1 is connected to the collector of the transistor Q2 through a resistor R7, the collector of the transistor Q1 is connected to terminal 8 of the plug-in board J1, the base of the transistor Q2 is connected to terminal 8 of the plug-in board J1 through a resistor R6, and the emitter of the transistor Q2 is connected to terminal 1 of the plug-in board J1.

[0014] The lithium battery equalization controller disclosed in the utility model has the beneficial effect that it includes multiple lithium battery voltage equalization units, each of which controls a lithium battery respectively, so that when the MOS tube P1, the MOS tube P2, the MOS tube P3 and the MOS tube P4 are synchronously turned on or off, the terminal voltage of each lithium battery remains consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is the main circuit structure diagram (circuit principle diagram) of this application. DETAILED DESCRIPTION

[0016] The utility model discloses a lithium battery equalization controller, which is described in conjunction with a preferred embodiment (embodiment 1) and with reference to the accompanying drawings. Figure 1 , the specific implementation methods of the utility model are further described.

[0017] See attached figure Figure 1 , Figure 1 The main circuit structure of the lithium battery equalization controller is shown.

[0018] Example 1.

[0019] Preferably, the lithium battery balancing controller includes a lithium battery B1, a lithium battery B2, a lithium battery B3 and a lithium battery B4 connected in series in sequence, and further includes:

[0020] A first lithium battery voltage balancing unit, the first lithium battery voltage balancing unit includes a resistor R1, a voltage limiting diode D1, a MOS transistor P1 and a winding W1, the common end between the resistor R1 and the positive electrode of the voltage limiting diode D1 is connected to the negative electrode of the lithium battery B1, the common end between the resistor R1 and the negative electrode of the voltage limiting diode D1 is connected to the gate of the MOS transistor P1, the drain of the MOS transistor P1 is connected to one end of the winding W1, and the other end of the winding W1 is connected to the positive electrode of the lithium battery B1 to form a circuit for controlling the lithium battery B1, and the lithium battery B1 is externally connected to an electrical appliance (not shown in the figure);

[0021] The second lithium battery voltage balancing unit includes a resistor R2, a voltage limiting diode D2, a MOS tube P2 and a winding W2. The common end between the resistor R2 and the positive electrode of the voltage limiting diode D2 is connected to the negative electrode of the lithium battery B2, the common end between the resistor R2 and the negative electrode of the voltage limiting diode D2 is connected to the gate of the MOS tube P2, the drain of the MOS tube P2 is connected to one end of the winding W2, and the other end of the winding W2 is connected to the positive electrode of the lithium battery B2 to form a circuit for controlling the lithium battery B2. The lithium battery B2 is externally connected to an electrical appliance (not shown in the figure); the source of the MOS tube P1 is connected to the winding W2;

[0022] The third lithium battery voltage balancing unit includes a resistor R3, a voltage limiting diode D3, a MOS tube P3 and a winding W3. The common end between the resistor R3 and the positive electrode of the voltage limiting diode D3 is connected to the negative electrode of the lithium battery B3, the common end between the resistor R3 and the negative electrode of the voltage limiting diode D3 is connected to the gate of the MOS tube P3, the drain of the MOS tube P3 is connected to one end of the winding W3, and the other end of the winding W3 is connected to the positive electrode of the lithium battery B3 to form a circuit for controlling the lithium battery B3. The lithium battery B3 is externally connected to an electrical appliance (not shown in the figure); the source of the MOS tube P2 is connected to the winding W3;

[0023] The fourth lithium battery voltage balancing unit includes a resistor R4, a voltage limiting diode D4, a MOS tube P4 and a winding W4. The common end between the resistor R4 and the positive electrode of the voltage limiting diode D4 is connected to the negative electrode of the lithium battery B4, the common end between the resistor R4 and the negative electrode of the voltage limiting diode D4 is connected to the gate of the MOS tube P4, the drain of the MOS tube P4 is connected to one end of the winding W4, and the other end of the winding W4 is connected to the positive electrode of the lithium battery B4 to form a circuit for controlling the lithium battery B4. The lithium battery B4 is externally connected to an electrical appliance (not shown in the figure); the source of the MOS tube P3 is connected to the winding W4.

[0024] The second lithium battery voltage balancing unit further includes a capacitor C1, one end of the capacitor C1 is connected to the gate of the MOS tube P1, and the other end of the capacitor C1 is connected to the gate of the MOS tube P2, so that adjacent battery voltage balancing units are interconnected.

[0025] The third lithium battery voltage balancing unit further includes a capacitor C2, one end of the capacitor C2 is connected to the gate of the MOS transistor P2, and the other end of the capacitor C2 is connected to the gate of the MOS transistor P3, so that adjacent battery voltage balancing units are interconnected.

[0026] The fourth lithium battery voltage balancing unit further includes a capacitor C3, one end of the capacitor C3 is connected to the gate of the MOS tube P3, and the other end of the capacitor C3 is connected to the gate of the MOS tube P4, so that adjacent battery voltage balancing units are interconnected.

[0027] The lithium battery balancing controller further includes a plug board J1, a transistor Q1 and a transistor Q2. The base of the transistor Q1 is connected to the collector of the transistor Q2 through a resistor R7. The collector of the transistor Q1 is connected to terminal 8 of the plug board J1. The base of the transistor Q2 is connected to terminal 8 of the plug board J1 through a resistor R6. The emitter of the transistor Q2 is connected to terminal 1 of the plug board J1. Therefore, when the MOS tubes P1, P2, P3 and P4 are synchronously turned on or off, the terminal voltages of the lithium batteries B1, B2, B3 and B4 connected in series in sequence are kept consistent.

[0028] A resistor R8 is connected in parallel between the emitter of the transistor Q1 and the base of the transistor Q1 .

[0029] Among them, the model of transistor Q1 is preferably 2N2907.

[0030] Among them, the model of the transistor Q2 is preferably 2N3904.

[0031] The resistors R1 , R2 , R3 and R4 are preferably all high-value resistors of 220 kilo-ohms.

[0032] The voltage limiting diode D1 , the voltage limiting diode D2 , the voltage limiting diode D3 and the voltage limiting diode D4 are preferably all IN4148.

[0033] It is worth mentioning that the technical features such as the specific model of the plug board J1 involved in this utility model patent application should be regarded as the prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected according to the conventional methods in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated.

[0034] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A lithium battery equalization controller, characterized in that: It includes lithium battery B1, lithium battery B2, lithium battery B3 and lithium battery B4 connected in series, and also includes: A first lithium battery voltage balancing unit, the first lithium battery voltage balancing unit includes a resistor R1, a voltage limiting diode D1, a MOS transistor P1 and a winding W1, the common end between the resistor R1 and the positive electrode of the voltage limiting diode D1 is connected to the negative electrode of the lithium battery B1, the common end between the resistor R1 and the negative electrode of the voltage limiting diode D1 is connected to the gate of the MOS transistor P1, the drain of the MOS transistor P1 is connected to one end of the winding W1, and the other end of the winding W1 is connected to the positive electrode of the lithium battery B1; A second lithium battery voltage balancing unit, the second lithium battery voltage balancing unit includes a resistor R2, a voltage limiting diode D2, a MOS tube P2 and a winding W2, the common end between the resistor R2 and the positive electrode of the voltage limiting diode D2 is connected to the negative electrode of the lithium battery B2, the common end between the resistor R2 and the negative electrode of the voltage limiting diode D2 is connected to the gate of the MOS tube P2, the drain of the MOS tube P2 is connected to one end of the winding W2, and the other end of the winding W2 is connected to the positive electrode of the lithium battery B2; The third lithium battery voltage balancing unit includes a resistor R3, a voltage limiting diode D3, a MOS tube P3 and a winding W3. The common end between the resistor R3 and the positive electrode of the voltage limiting diode D3 is connected to the negative electrode of the lithium battery B3, the common end between the resistor R3 and the negative electrode of the voltage limiting diode D3 is connected to the gate of the MOS tube P3, the drain of the MOS tube P3 is connected to one end of the winding W3, and the other end of the winding W3 is connected to the positive electrode of the lithium battery B3; The fourth lithium battery voltage balancing unit includes a resistor R4, a voltage limiting diode D4, a MOS tube P4 and a winding W4. The common end between the resistor R4 and the positive electrode of the voltage limiting diode D4 is connected to the negative electrode of the lithium battery B4, the common end between the resistor R4 and the negative electrode of the voltage limiting diode D4 is connected to the gate of the MOS tube P4, the drain of the MOS tube P4 is connected to one end of the winding W4, and the other end of the winding W4 is connected to the positive electrode of the lithium battery B4.

2. The lithium battery equalization controller according to claim 1, characterized in that: The second lithium battery voltage balancing unit further includes a capacitor C1, one end of the capacitor C1 is connected to the gate of the MOS transistor P1, and the other end of the capacitor C1 is connected to the gate of the MOS transistor P2.

3. The lithium battery equalization controller according to claim 1, characterized in that: The third lithium battery voltage balancing unit further includes a capacitor C2, one end of the capacitor C2 is connected to the gate of the MOS transistor P2, and the other end of the capacitor C2 is connected to the gate of the MOS transistor P3.

4. The lithium battery equalization controller according to claim 1, characterized in that: The fourth lithium battery voltage balancing unit further includes a capacitor C3, one end of the capacitor C3 is connected to the gate of the MOS transistor P3, and the other end of the capacitor C3 is connected to the gate of the MOS transistor P4.

5. The lithium battery equalization controller according to claim 1, characterized in that: The lithium battery balancing controller also includes a plug board J1, a transistor Q1 and a transistor Q2. The base of the transistor Q1 is connected to the collector of the transistor Q2 through a resistor R7. The collector of the transistor Q1 is connected to terminal 8 of the plug board J1. The base of the transistor Q2 is connected to terminal 8 of the plug board J1 through a resistor R6. The emitter of the transistor Q2 is connected to terminal 1 of the plug board J1.

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