Battery management system and electronic equipment for direct-current balanced distribution control

Abstract

The utility model relates to a direct current balanced distribution control battery management system and electronic equipment. The battery management system for direct-current balanced distribution control comprises a battery module, a first conversion circuit and a balanced circuit, wherein the first end of the battery module is respectively connected with the first end of the first conversion circuit and the first end of the equalization circuit, and the second end of the battery module is respectively connected with the second end of the first conversion circuit and the second end of the equalization circuit; wherein when the battery module is in a steady state, the first conversion circuit converts a first direct current output by the battery module into a second direct current; and when the battery module is in an unsteady state, the equalization circuit carries out equalization processing on the battery module.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, more specifically, the utility model relates to a direct current equalization distribution control's battery management system and electronic equipment. BACKGROUND

[0002] With the rapid development of energy storage technology, batteries have become mainstream energy storage devices, and batteries can be applied to vehicle, residential or factory scenarios. In the prior art, the battery management system can generally control the charging and discharging of the series connected battery, and control the equalization of the series connected battery, but the series connected battery can only supply power to the load at the same time, and the application scenario is limited. SUMMARY

[0003] An object of the utility model is to provide a direct current equalization distribution control's battery management system and electronic equipment.

[0004] According to one aspect of the utility model, a direct current equalization distribution control's battery management system is provided, the system includes a battery module, a first conversion circuit and an equalization circuit;

[0005] The first end of the battery module is connected to the first end of the first conversion circuit and the first end of the equalization circuit, and the second end of the battery module is connected to the second end of the first conversion circuit and the second end of the equalization circuit.

[0006] When the battery module is in a steady state, the first conversion circuit converts the first direct current output by the battery module into a second direct current; when the battery module is in a non-steady state, the equalization circuit performs equalization processing on the battery module.

[0007] Optionally, the battery module includes a first battery and a second battery; the first end of the first battery serves as the first end of the battery module, the first end of the second battery is connected to the second end of the first battery, and the second end of the second battery serves as the second end of the battery module; at least part of the equalization devices in the equalization circuit are multiplexed for equalization processing of the first battery and equalization processing of the second battery.

[0008] Optionally, the first end of the equalization circuit is connected to the first end of the first battery, the second end of the equalization circuit is connected to the second end of the first battery, and the third end of the equalization circuit is connected to the second end of the second battery.

[0009] Optionally, the equalization circuit includes a first resistor, a second resistor, a third resistor, a first switch tube and a second switch tube; the at least part of the equalization devices is the second resistor.

[0010] The first end of the first resistor is connected with the first end of the first battery, the second end of the first resistor is connected with the drain of the first switch tube, the first end of the second resistor is connected with the second end of the first battery and the first end of the second battery respectively, the second end of the second resistor is connected with the source of the first switch tube and the drain of the second switch tube, the first end of the third resistor is connected with the second end of the second battery, and the second end of the third resistor is connected with the source of the second switch tube.

[0011] Optionally, the system further comprises a first control circuit, and the first control circuit is connected with the gate of the first switch tube and the gate of the second switch tube respectively.

[0012] Optionally, the first conversion circuit comprises a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube.

[0013] The connection point of the source of the third switch tube and the source of the fifth switch tube is connected with the first end of the battery module, the connection point of the drain of the fourth switch tube and the drain of the sixth switch tube is connected with the second end of the battery module, the connection point of the drain of the third switch tube and the source of the fourth switch tube is the first load connection end of the system, and the connection point of the drain of the fifth switch tube and the source of the sixth switch tube is the second load connection end of the system.

[0014] Optionally, the system further comprises a second control circuit, and the second control circuit is connected with the gate of the third switch tube, the gate of the fourth switch tube, the gate of the fifth switch tube and the gate of the sixth switch tube respectively.

[0015] Optionally, the system further comprises a second conversion circuit; the battery module is multiple, and the multiple battery modules are connected in sequence, the first end of the first battery module is connected with the first end of the second conversion circuit, and the second end of the last battery module is connected with the second end of the second conversion circuit.

[0016] Optionally, the second conversion circuit comprises a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube.

[0017] The connection point of the source of the seventh switch tube and the source of the ninth switch tube is connected with the first end of the first battery module, the connection point of the drain of the eighth switch tube and the drain of the tenth switch tube is connected with the second end of the last battery module, the connection point of the drain of the seventh switch tube and the source of the eighth switch tube is the third load connection end of the system, and the connection point of the drain of the ninth switch tube and the source of the tenth switch tube is the fourth load connection end of the system.

[0018] According to one aspect of the present application, an electronic device is provided, which comprises the battery management system of direct current equalization distribution control as described in the first aspect.

[0019] One technical effect of the present application is that the battery management system of direct current equalization distribution control can convert the first direct current output by the battery module into the second direct current through the first conversion circuit when the battery module is in a steady state; and the equalization circuit performs equalization processing on the battery module when the battery module is in a non-steady state, which makes the battery module can supply power to the load alone through the first conversion circuit, so as to be suitable for the scene that multiple loads need to be powered at the same time.

[0020] Other features and advantages of the present application will become apparent from the following detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0022] Figure 1 is a structural block diagram of the battery management system of direct current equalization distribution control in the embodiments of the present application;

[0023] Figure 2 is a circuit diagram of the battery management system of direct current equalization distribution control in the embodiments of the present application;

[0024] Figure 3 is a circuit diagram of the first conversion circuit in the embodiments of the present application;

[0025] Figure 4 is a circuit diagram of the second conversion circuit in the embodiments of the present application. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0028] Techniques and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification as appropriate.

[0029] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0030] It should be noted that like numerals and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0031] Figure 1 is a structural block diagram of a direct current equalization distribution control battery management system of an embodiment of the present application. As shown in Figure 1 the system comprises a battery module 10, a first conversion circuit 20 and an equalization circuit 30;

[0032] wherein a first end of the battery module 10 is connected with a first end of the first conversion circuit 20 and a first end of the equalization circuit 30 respectively, and a second end of the battery module 10 is connected with a second end of the first conversion circuit 20 and a second end of the equalization circuit 30 respectively;

[0033] wherein when the battery module 10 is in a steady state, the first conversion circuit 20 converts a first direct current output by the battery module 10 into a second direct current; and when the battery module 10 is in a non-steady state, the equalization circuit 30 performs equalization processing on the battery module 10.

[0034] In the embodiment, the battery module 10 being in the steady state can be that a difference between voltages of the batteries in the battery module 10 is less than or equal to a set threshold. The battery module 10 being in the non-steady state can be that the difference between the voltages of the batteries in the battery module 10 is greater than the set threshold.

[0035] In the embodiment, the first conversion circuit 20 can be a DC-DC conversion circuit, which can convert the first direct current output by the battery module 10 into the second direct current, wherein the voltage of the first direct current can be greater than the voltage of the second direct current, or the voltage of the first direct current can be less than the voltage of the second direct current, which is not limited herein.

[0036] In the embodiment, the equalization circuit 30 can be used to consume the electric energy of one battery in the battery module 10, so that the electric energy of each battery in the battery module 10 is relatively equalized.

[0037] In other words, the direct current equalization distribution control battery management system can convert the first direct current output by the battery module 10 into the second direct current by the first conversion circuit 20 when the battery module 10 is in the steady state, and perform equalization processing on the battery module 10 by the equalization circuit 30 when the battery module 10 is in the non-steady state, which makes the battery module 10 able to supply power to the load 50 alone through the first conversion circuit 20, so as to be applicable to a scenario where multiple loads 50 need to be powered at the same time.

[0038] In some embodiments, as shown in Figure 2 The battery module 10 includes a first battery BAT1 and a second battery BAT2; a first end of the first battery BAT1 is a first end of the battery module 10, a first end of the second battery BAT2 is connected to a second end of the first battery BAT1, and a second end of the second battery BAT2 is a second end of the battery module 10. At least part of the equalization devices in the equalization circuit 30 are multiplexed for equalization processing of the first battery BAT1 and equalization processing of the second battery BAT2.

[0039] In other words, by multiplexing at least part of the equalization devices in the equalization circuit 30 for equalization processing of the first battery BAT1 and equalization processing of the second battery BAT2, the manufacturing cost of the battery management system for direct current equalization distribution control can be effectively reduced under the premise of realizing the equalization function of the battery module 10.

[0040] In some embodiments, in order to realize the multiplexing of at least part of the equalization devices in the equalization circuit 30, a first end of the equalization circuit 30 is connected to a first end of the first battery BAT1, a second end of the equalization circuit 30 is connected to a second end of the first battery BAT1, and a third end of the equalization circuit 30 is connected to a second end of the second battery BAT2.

[0041] In some embodiments, as shown in Figure 2 The equalization circuit 30 includes a first resistor R1, a second resistor R2, a third resistor R3, a first switch tube Q1, and a second switch tube Q2; and at least part of the equalization devices is the second resistor R2.

[0042] The first end of the first resistor R1 is connected to the first end of the first battery BAT1, the second end of the first resistor R1 is connected to the drain of the first switch tube Q1, the first end of the second resistor R2 is connected to the second end of the first battery BAT1 and the first end of the second battery BAT2, the second end of the second resistor R2 is connected to the source of the first switch tube Q1 and the drain of the second switch tube Q2, the first end of the third resistor R3 is connected to the second end of the second battery BAT2, and the second end of the third resistor R3 is connected to the source of the second switch tube Q2.

[0043] In this embodiment, when the voltage of the first battery BAT1 is too high, the first switch tube Q1 is turned on, and the electrical energy of the first battery BAT1 is consumed through the first resistor R1 and the second resistor R2, thereby realizing the equalization of the first battery BAT1 and the second battery BAT2. When the voltage of the second battery BAT2 is too high, the second switch tube Q2 is turned on, and the electrical energy of the second battery BAT2 is consumed through the second resistor R2 and the third resistor R3, thereby realizing the equalization of the first battery BAT1 and the second battery BAT2.

[0044] In some embodiments, the system further comprises a first control circuit, which is connected to the gate of the first switch Q1 and the gate of the second switch Q2 respectively.

[0045] In the embodiment, the first switch Q1 can be a MOS tube, the second switch Q2 can also be a MOS tube, and the first switch Q1 and the second switch Q2 can be controlled by the first control circuit. The first control circuit can be an AFE chip.

[0046] In the embodiment, when the voltage of the first battery BAT1 is too high, the first control circuit can control the first switch Q1 to be turned on, and the electric energy of the first battery BAT1 is consumed through the first resistor R1 and the second resistor R2, so as to realize the balance of the first battery BAT1 and the second battery BAT2. When the voltage of the second battery BAT2 is too high, the first control circuit can control the second switch Q2 to be turned on, and the electric energy of the second battery BAT2 is consumed through the second resistor R2 and the third resistor R3, so as to realize the balance of the first battery BAT1 and the second battery BAT2.

[0047] In some embodiments, in order to realize the conversion of the first direct current output by the battery module 10A into the second direct current that can be used by the load 50A, the first conversion circuit 20 comprises a third switch Q5, a fourth switch Q6, a fifth switch Q7 and a sixth switch Q8.

[0048] The connection point of the source of the third switch Q5 and the source of the fifth switch Q7 is connected to the first end of the battery module 10A, the connection point of the drain of the fourth switch Q6 and the drain of the sixth switch Q8 is connected to the second end of the battery module 10A, the connection point of the drain of the third switch Q5 and the source of the fourth switch Q6 is the first load 50 connection end of the system, and the connection point of the drain of the fifth switch Q7 and the source of the sixth switch Q8 is the second load 50 connection end of the system.

[0049] In the embodiment, the third switch Q5, the fourth switch Q6, the fifth switch Q7 and the sixth switch Q8 are all MOS tubes, the fourth switch Q6 and the fifth switch Q7 are turned off when the third switch Q5 and the sixth switch Q8 are turned on, and the fourth switch Q6 and the fifth switch Q7 are turned on when the third switch Q5 and the sixth switch Q8 are turned off. That is to say, the third switch Q5 and the sixth switch Q8 are the first group of switches, and the fourth switch Q6 and the fifth switch Q7 are the second group of switches, and the two groups of switches are turned on alternately to realize the conversion of the first direct current output by the battery module 10A into the second direct current that can be used by the load 50A.

[0050] In some embodiments, the system further comprises a second control circuit, which is connected to the gate of the third switch Q5, the gate of the fourth switch Q6, the gate of the fifth switch Q7 and the gate of the sixth switch Q8, respectively.

[0051] In the embodiment, the second control circuit can be a control chip.

[0052] In the embodiment, the second control circuit can convert the first direct current output by the battery module 10A into the second direct current that can be used by the load 50A by outputting a PWM wave signal to the first conversion circuit 20. In addition, the second control circuit can adjust the conversion efficiency of the second direct current by adjusting the duty cycle of the PWM wave signal.

[0053] In some embodiments, in order to realize that the series-connected battery modules 10 can charge and discharge for one load 50, the system further comprises a second conversion circuit 40; the battery modules 10 are multiple, and the multiple battery modules 10 are connected in sequence, the first end of the first battery module 10 is connected to the first end of the second conversion circuit 40, and the second end of the last battery module 10 is connected to the second end of the second conversion circuit 40.

[0054] In some embodiments, as shown in Figure 4 the second conversion circuit 40 comprises a seventh switch Q9, an eighth switch Q10, a ninth switch Q11 and a tenth switch Q12;

[0055] The connection point of the source of the seventh switch Q9 and the source of the ninth switch Q11 is connected to the first end of the first battery module 10, the connection point of the drain of the eighth switch Q10 and the drain of the tenth switch Q12 is connected to the second end of the last battery module 10, the connection point of the drain of the seventh switch Q9 and the source of the eighth switch Q10 is the third load 50 connection end of the system, and the connection point of the drain of the ninth switch Q11 and the source of the tenth switch Q12 is the fourth load 50 connection end of the system.

[0056] In the embodiment, the seventh switch Q9, the eighth switch Q10, the ninth switch Q11 and the tenth switch Q12 are all MOS tubes, the eighth switch Q10 and the ninth switch Q11 are turned off when the seventh switch Q9 and the tenth switch Q12 are turned on, and the eighth switch Q10 and the ninth switch Q11 are turned on when the seventh switch Q9 and the tenth switch Q12 are turned off; that is, the seventh switch Q9 and the tenth switch Q12 are the third group of switches, and the eighth switch Q10 and the ninth switch Q11 are the fourth group of switches, and the two groups of switches are turned on alternately to convert the third direct current output by the battery module 10A and the battery module 10B into the fourth direct current that can be used by the load 50C.

[0057] In the present embodiment, the seventh switch tube Q9, the eighth switch tube Q10, the ninth switch tube Q11 and the tenth switch tube Q12 can be controlled by the second control circuit. And the second control circuit can convert the third direct current output by the battery module 10A and the battery module 10B into the fourth direct current that can be used by the load 50C by outputting the PWM wave signal to the second conversion circuit 40. And the second control circuit can adjust the conversion efficiency of the fourth direct current by adjusting the duty cycle of the PWM wave signal.

[0058] According to the electronic device provided in the embodiments of the present application, the battery management system of the direct current equalization distribution control in any of the above embodiments is included.

[0059] Although some specific embodiments of the present application have been described in detail by way of example with reference to the accompanying drawings, it is to be understood that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery management system for direct current equalization distribution control, characterized by, The system comprises a battery module, a first conversion circuit and an equalization circuit; The first end of the battery module is connected with the first end of the first conversion circuit and the first end of the equalization circuit respectively, and the second end of the battery module is connected with the second end of the first conversion circuit and the second end of the equalization circuit respectively; When the battery module is in a steady state, the first conversion circuit converts the first direct current output by the battery module into a second direct current; when the battery module is in a non-steady state, the equalization circuit performs equalization processing on the battery module.

2. The system of claim 1, wherein, The battery module comprises a first battery and a second battery; the first end of the first battery serves as the first end of the battery module, the first end of the second battery is connected with the second end of the first battery, and the second end of the second battery serves as the second end of the battery module; At least part of the equalization devices in the equalization circuit are multiplexed for equalization processing of the first battery and equalization processing of the second battery.

3. The system of claim 2, wherein, The first end of the equalization circuit is connected with the first end of the first battery, the second end of the equalization circuit is connected with the second end of the first battery, and the third end of the equalization circuit is connected with the second end of the second battery.

4. The system of claim 3, wherein, The equalization circuit comprises a first resistor, a second resistor, a third resistor, a first switch tube and a second switch tube; the at least part of the equalization devices are the second resistor; The first end of the first resistor is connected with the first end of the first battery, the second end of the first resistor is connected with the drain of the first switch tube, the first end of the second resistor is connected with the second end of the first battery and the first end of the second battery respectively, the second end of the second resistor is connected with the source of the first switch tube and the drain of the second switch tube, the first end of the third resistor is connected with the second end of the second battery, and the second end of the third resistor is connected with the source of the second switch tube.

5. The system of claim 4, wherein, The system further comprises a first control circuit connected with the gate of the first switch tube and the gate of the second switch tube respectively.

6. The system of claim 1, wherein, The first conversion circuit comprises a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube; The connection point of the source of the third switch tube and the source of the fifth switch tube is connected with the first end of the battery module, the connection point of the drain of the fourth switch tube and the drain of the sixth switch tube is connected with the second end of the battery module, the connection point of the drain of the third switch tube and the source of the fourth switch tube serves as a first load connection end of the system, and the connection point of the drain of the fifth switch tube and the source of the sixth switch tube serves as a second load connection end of the system.

7. The system of claim 6, wherein, The system further comprises a second control circuit connected with the gate of the third switch tube, the gate of the fourth switch tube, the gate of the fifth switch tube and the gate of the sixth switch tube respectively.

8. The system of claim 1, wherein, The system further comprises a second conversion circuit; the battery modules are multiple, and the multiple battery modules are connected in sequence, a first end of a first battery module is connected with a first end of the second conversion circuit, and a second end of a last battery module is connected with a second end of the second conversion circuit.

9. The system of claim 8, wherein, The second conversion circuit comprises a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube. The connection point of the source of the seventh switch tube and the source of the ninth switch tube is connected with the first end of the first battery module, the connection point of the drain of the eighth switch tube and the drain of the tenth switch tube is connected with the second end of the last battery module, the connection point of the drain of the seventh switch tube and the source of the eighth switch tube is the third load connection end of the system, and the connection point of the drain of the ninth switch tube and the source of the tenth switch tube is the fourth load connection end of the system.

10. An electronic device, comprising: The electronic device comprises the direct current equalization distribution control battery management system as claimed in any one of claims 1 to 9.

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