Battery voltage equalization circuit, device and system

Abstract

The utility model discloses a battery voltage equalization circuit, device and system, and relates to the technical field of power supply, and the circuit comprises a first battery pack, a second battery pack, a control module, a first power conversion module, a second power conversion module and a load. The input end of the first power conversion module is connected with the output end of the first battery pack, the input end of the second power conversion module is connected with the output end of the second battery pack, and the output end of the first power conversion module and the output end of the second power conversion module are connected to the power supply input end of the load in parallel. For a first battery pack and a second battery pack which are connected in series, a control module controls output power of a first power conversion module connected with the first battery pack and output power of a second power conversion module connected with the second battery pack according to working power of a load, voltage at two ends of the first battery pack and voltage at two ends of the second battery pack; and the voltages of the first battery pack and the second battery pack are kept balanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a battery voltage equalization circuit, device and system. BACKGROUND

[0002] The existing high-voltage power battery of a new energy vehicle can generally adopt two battery groups in series to form a total battery for power supply of the vehicle. However, there are some low-voltage components inside the vehicle, and therefore at least one DC / DC power converter is needed to convert the high-voltage power output by the battery into low-voltage power, so as to realize low-voltage power supply for the low-voltage components. The high-voltage input of the DC / DC power converter is directly connected to the positive and negative DC bus lines of the high-voltage power battery, and therefore the DC / DC power converter can only control the output power of the entire high-voltage power battery, but cannot control the output power of a single battery group. When the entire high-voltage power battery supplies power to a certain load, due to the difference in internal resistance of each battery group, there is often a voltage imbalance between the battery groups. If the work is carried out in a long-term voltage imbalance state, overcharging or over-discharging of each battery group will occur, which seriously affects the battery life. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a battery voltage equalization circuit, device and system, which aims to solve the technical problem of how to prevent the output voltage imbalance of two battery groups in series.

[0004] To achieve the above-mentioned purpose, the battery voltage equalization circuit provided by the embodiments of the present application comprises: a first battery group, a second battery group, a control module, a first power conversion module, a second power conversion module and a load, wherein,

[0005] The first battery group and the second battery group are connected in series.

[0006] The input end of the first power conversion module is connected to the output end of the first battery group, the input end of the second power conversion module is connected to the output end of the second battery group, and the output end of the first power conversion module and the output end of the second power conversion module are connected in parallel to the power supply input end of the load.

[0007] The control module is connected with the output end of the first battery pack, the output end of the second battery pack, the control end of the first power conversion module and the control end of the second power conversion module respectively, and is used for adjusting the output power of the first power conversion module and the second power conversion module according to the working power of the load, the output voltage of the first battery pack and the output voltage of the second battery pack, so that the output voltage of the first battery pack and the output voltage of the second battery pack are kept balanced when the load normally works.

[0008] In an embodiment, the battery voltage equalization circuit further comprises: a plurality of the first power conversion modules, an equal number of the second power conversion modules and an equal number of loads.

[0009] The input ends of each of the first power conversion modules are connected with each other, and the input ends of each of the second power conversion modules are connected with each other.

[0010] Each of the first power conversion modules, each of the second power conversion modules and each of the loads are grouped one by one.

[0011] In each group, the output end of the first power conversion module and the output end of the second power conversion module are connected to the load.

[0012] The control module is further connected with the control end of each of the first power conversion modules and the control end of each of the second power conversion modules respectively, and is used for adjusting the output power of each of the first power conversion modules and each of the second power conversion modules according to the working power of each of the loads, the output voltage of the first battery pack and the output voltage of the second battery pack, so that the output voltage of the first battery pack and the output voltage of the second battery pack are kept balanced when each of the loads normally works.

[0013] In an embodiment, the battery voltage equalization circuit further comprises: a first voltage stabilizing module.

[0014] The input end of the first voltage stabilizing module is connected with the output end of the first battery pack, and the output end of the first voltage stabilizing module is connected with the input end of the first power conversion module.

[0015] The first voltage stabilizing module is used for stabilizing the output voltage of the first battery pack and transmitting the output voltage to the first power conversion module.

[0016] In an embodiment, the first voltage stabilizing module is further used for regulating the output voltage of the first battery pack and transmitting the output voltage to the first power conversion module.

[0017] In an embodiment, the battery voltage equalization circuit further comprises: a second voltage stabilizing module.

[0018] The input end of the second voltage stabilizing module is connected to the output end of the second battery pack, and the output end of the second voltage stabilizing module is connected to the input end of the second power conversion module.

[0019] The second voltage stabilizing module is configured to stabilize the output voltage of the second battery pack and transmit the stabilized output voltage to the second power conversion module.

[0020] In an embodiment, the second voltage stabilizing module is further configured to regulate the output voltage of the second battery pack and transmit the regulated output voltage to the second power conversion module.

[0021] In an embodiment, the first power conversion module and the second power conversion module are both DC-DC converters.

[0022] In addition, to achieve the above object, the present application also provides a battery voltage equalization device, which employs the battery voltage equalization circuit as described above.

[0023] In addition, to achieve the above object, the present application also provides a battery voltage equalization system, which employs the battery voltage equalization device as described above.

[0024] The embodiments of the present application provide a battery voltage equalization circuit, device and system. The battery voltage equalization circuit comprises a first battery pack, a second battery pack, a control module, a first power conversion module, a second power conversion module and a load. The first battery pack and the second battery pack are connected in series. The input end of the first power conversion module is connected to the output end of the first battery pack, the input end of the second power conversion module is connected to the output end of the second battery pack, and the output end of the first power conversion module and the output end of the second power conversion module are connected in parallel to the power supply input end of the load. The control module is connected to the output end of the first battery pack, the output end of the second battery pack, the control end of the first power conversion module and the control end of the second power conversion module, respectively, and is configured to adjust the output power of the first power conversion module and the second power conversion module according to the working power of the load, the output voltage of the first battery pack and the output voltage of the second battery pack, so that the output voltage of the first battery pack and the output voltage of the second battery pack are kept equalized when the load is normally working.

[0025] For the first battery pack and the second battery pack connected in series, the control module is configured to control the output power of the first power conversion module connected to the first battery pack and the second power conversion module connected to the second battery pack according to the working power of the load, the voltage across the first battery pack and the voltage across the second battery pack, so that the voltage of the first battery pack and the voltage of the second battery pack are kept equalized. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings required to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0028] Figure 1 A structural connection diagram provided for the first embodiment of the battery voltage equalization circuit of the present application;

[0029] Figure 2 A circuit connection diagram provided for the second embodiment of the battery voltage equalization circuit of the present application;

[0030] Figure 3 A circuit connection diagram provided for the third embodiment of the battery voltage equalization circuit of the present application;

[0031] Figure 4 Another circuit connection diagram provided for the third embodiment of the battery voltage equalization circuit of the present application.

[0032] The purposes, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are merely intended to explain the technical solutions of the present application, and are not intended to limit the present application.

[0034] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the accompanying drawings and specific embodiments.

[0035] The main solution of the present application is that the power outputted from the first battery pack and the second battery pack connected in series to the same load is kept the same or extremely close by controlling the first battery pack and the second battery pack through the first power conversion module and the second power conversion module respectively. Since the current through the first battery pack and the second battery pack connected in series is the same or extremely close, the output voltage of the first battery pack and the output voltage of the second battery pack are also the same or extremely close, which can effectively prevent the phenomenon of voltage imbalance of the first battery pack and the second battery pack connected in series.

[0036] At present, the high-voltage power battery of the existing new energy vehicle can generally adopt two battery groups in series to form a total battery for power supply of the vehicle. Since there are some low-voltage components in the vehicle, at least one DC / DC power converter is needed to convert the high-voltage power output by the battery into low-voltage power, so as to realize low-voltage power supply for the low-voltage components. The high-voltage input of the general DC / DC power converter is directly connected to the positive and negative DC bus lines of the high-voltage power battery, so the DC / DC power converter can only control the output power of the entire high-voltage power battery, and cannot control the output power of a single battery group. When the entire high-voltage power battery supplies power to a certain load, due to the difference in internal resistance of each battery group, there is often a voltage imbalance between the battery groups. If the work is carried out in a long-term voltage imbalance state, each battery group will be overcharged or over-discharged, which seriously affects the battery life. Therefore, how to prevent the output voltage imbalance of the two battery groups in series is a problem that needs to be solved at present.

[0037] The application is directed to the first battery group and the second battery group in series, and the output power of the first power conversion module connected with the first battery group and the second power conversion module connected with the second battery group is controlled by the control module according to the working power of the load, the voltage across the first battery group and the voltage across the second battery group, so that the voltages of the first battery group and the second battery group are kept balanced.

[0038] Based on this, the battery voltage balancing circuit of the first embodiment is proposed, please refer to Figure 1 The battery voltage balancing circuit includes a first battery group B1, a second battery group B2, a control module, a first power conversion module S1, a second power conversion module S2 and a load Loud, wherein,

[0039] The first battery group B1 and the second battery group B2 are connected in series;

[0040] The input end of the first power conversion module S1 is connected to the output end of the first battery group B1, the input end of the second power conversion module S2 is connected to the output end of the second battery group B2, and the output end of the first power conversion module S1 and the output end of the second power conversion module S2 are connected in parallel to the power supply input end of the load Loud;

[0041] The control module is connected with the output end of the first battery pack B1, the output end of the second battery pack B2, the control end of the first power conversion module S1 and the control end of the second power conversion module S2 respectively, and is used for adjusting the output power of the first power conversion module S1 and the second power conversion module S2 according to the working power of the load Loud, the output voltage of the first battery pack B1 and the output voltage of the second battery pack B2, so that the output voltage of the first battery pack B1 and the output voltage of the second battery pack B2 are kept balanced when the load Loud normally works.

[0042] It should be understood that, with reference to Figure 1 The connection relationship can be understood as that the positive electrode of the first battery pack B1 is connected to the positive input end of the first power conversion module S1, the negative electrode of the first battery pack B1 is connected to the negative input end of the first power conversion module S1, the positive electrode of the second battery pack B2 is connected to the positive input end of the second power conversion module S2, and the negative electrode of the second battery pack B2 is connected to the negative input end of the second power conversion module S2. The positive output end of the first power conversion module S1 and the positive output end of the second power conversion module S2 are commonly connected to one end of the load Loud, and the negative output end of the first power conversion module S1 and the negative output end of the second power conversion module S2 are commonly connected to the other end of the load Loud. The connection relationship between the battery packs and the power conversion modules or the connection relationship between the power conversion modules and the load can be understood as described above. Since the first battery pack B1 and the second battery pack B2 are in series, the negative input end of the first power conversion module S1 and the positive input end of the second power conversion module S2 are also connected.

[0043] It is worth noting that the control module (not shown in the figure) is connected with both ends of the first battery pack B1 and both ends of the second battery pack B2, so that the output voltage of the first battery pack B1 and the output voltage of the second battery pack B2 can be collected respectively. In addition, the control module is also connected with the control end of the first power conversion module S1 and the control end of the second power conversion module S2 respectively. When the voltage difference between the output voltage of the first battery pack B1 and the output voltage of the second battery pack B2 exceeds a certain threshold, it can be determined that the current battery voltage is unbalanced, and a corresponding set of control signals can be generated according to the voltage difference and sent to the first power conversion module S1 and the second power conversion module S2 respectively. At this time, the first power conversion module S1 and the second power conversion module S2 can cooperate to jointly control the power output from the first battery pack B1 and the second battery pack B2 to the load Loud. The control module can be composed of an independent controller or multiple different controllers, which is not limited here.

[0044] It should be noted that in the present embodiment, since the first battery pack B1 and the second battery pack B2 are in series with each other, the current values through the first battery pack B1 and the second battery pack B2 are the same during the discharging process of the first battery pack B1 and the second battery pack B2 to provide power for the load Loud. However, it does not mean that the current values outputted by the first battery pack B1 and the second battery pack B2 to the outside are necessarily the same. If the first battery pack B1 and the second battery pack B2 are additionally connected with external loads such as equalization resistors, the current values through the first battery pack B1 and the second battery pack B2 are still the same, but the current values outputted by the first battery pack B1 and the second battery pack B2 to the outside can be different. The current value through the first battery pack B1 and the second battery pack B2 should be equal to the sum of the current outputted to the corresponding power module and the current outputted to the additional external load.

[0045] It is easy to understand that if the voltage outputted by the first battery pack B1 is the first battery voltage and the voltage outputted by the second battery pack B2 is the second battery voltage, in the present embodiment, the first power conversion module S1 and the second power conversion module S2 are independent of each other, the first power conversion module S1 can control the power outputted by the first battery pack B1 to the load Loud independently, and the second power conversion module S2 can control the power outputted by the second battery pack B2 to the same load Loud independently.

[0046] In a specific implementation, as a possible situation, when the output voltages of the first battery pack B1 and the second battery pack B2 do not reach the balanced state, the first control module can control the output power of the first power conversion module S1 connected with the first battery pack B1 and the second power conversion module D2 connected with the second battery pack B2 according to the working power of the load Loud, the voltage across the first battery pack B1 and the voltage across the second battery pack B2, so as to keep the voltages of the first battery pack B1 and the second battery pack B2 balanced. Specifically, when the voltage across the first battery pack B1 is greater than the voltage across the second battery pack B2, the output power of the second power conversion module S2 is increased and / or the output power of the first power conversion module S1 is decreased, and the sum of the output powers of the first power conversion module S1 and the second power conversion module S2 is equal to the working power of the load Loud.

[0047] As another possible scenario, when the output voltages of the first battery pack B1 and the second battery pack B2 reach the balanced state, the first battery pack B1 and the second battery pack B2 in series supply power to the same load Loud, the control module can control the first power conversion module S1 to control the power output by the first battery pack B1 to the load Loud to be half of the required power of the load Loud, and at the same time control the second power conversion module S2 to control the power output by the second battery pack B2 to the load Loud to also be half of the required power of the load Loud. In this way, it can be considered that the required power currently received by the load Loud is equally divided by the first battery pack B1 and the second battery pack B2, that is, the output power of the first battery pack B1 and the second battery pack B2 is the same. Since the first battery pack B1 and the second battery pack B2 are in series, the current through the first battery pack B1 and the second battery pack B2 is also the same, and according to the relationship between power, current and voltage, when the power and current output by the first battery pack B1 and the second battery pack B2 to the corresponding first power conversion module S1 or second power conversion module S2 are adjusted to be the same or extremely close, the voltage across the first battery pack B1 and the voltage across the second battery pack B2 are also the same or extremely close. Through this circuit structure, it can be ensured that when the first battery pack B1 and the second battery pack B2 in series supply power to the same load Loud, the voltage across each battery pack always remains the same or extremely close (the first battery voltage and the second battery voltage remain the same or extremely close), so that the phenomenon of unbalanced battery voltage does not occur, and overcharging or overdischarging of the battery pack in series does not occur, which can effectively prolong the service life of the battery pack.

[0048] It is worth noting that in actual situations, when the first battery pack B1 and the second battery pack B2 reach the balanced state, the output voltages of the first battery pack B1 and the second battery pack B2 do not need to be exactly the same, and therefore the output power of the first power conversion module S1 and the output power of the second power conversion module S2 do not need to be exactly the same, as long as they are extremely close.

[0049] The embodiment of the present application provides a battery voltage equalization circuit, the battery voltage equalization circuit comprises: a first battery pack, a second battery pack, a control module, a first power conversion module, a second power conversion module and a load; wherein the first battery pack and the second battery pack are connected in series; the input end of the first power conversion module is connected with the output end of the first battery pack, the input end of the second power conversion module is connected with the output end of the second battery pack, and the output end of the first power conversion module and the output end of the second power conversion module are connected in parallel to the power supply input end of the load; the control module is connected with the output end of the first battery pack, the output end of the second battery pack, the control end of the first power conversion module and the control end of the second power conversion module respectively, is used for adjusting the output power of the first power conversion module and the second power conversion module according to the working power of the load, the output voltage of the first battery pack and the output voltage of the second battery pack, and realizes that the output voltage of the first battery pack and the output voltage of the second battery pack are kept balanced when the load normally works. For the first battery pack and the second battery pack connected in series, the output power of the first power conversion module connected with the first battery pack and the second power conversion module connected with the second battery pack is kept the same or extremely close by the control module, so that the output voltage of the first battery pack and the output voltage of the second battery pack are also kept the same or extremely close, and the voltage imbalance phenomenon generated after long time work of the two battery packs connected in series can be effectively prevented, and the service life of the battery pack is increased.

[0050] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as the above embodiment one can refer to the above introduction, and subsequent details will not be repeated. On this basis, please refer to Figure 2 , the battery voltage equalization circuit further comprises: a plurality of the first power conversion modules S1, the same number of the second power conversion modules S2 and the same number of loads Loud;

[0051] The input ends of the first power conversion modules S1 are connected with each other, and the input ends of the second power conversion modules S2 are connected with each other;

[0052] The first power conversion modules S1, the second power conversion modules S2 and the loads Loud are grouped one by one in a one-to-one correspondence;

[0053] In each group, the output end of the first power conversion module S1 and the output end of the second power conversion module S2 are connected to the load Loud;

[0054] The control module is also connected with the control end of each first power conversion module S1 and the control end of each second power conversion module S2 respectively, for adjusting the output power of each first power conversion module S1 and each second power conversion module S2 according to the working power of each load Loud, the output voltage of the first battery pack B1 and the output voltage of the second battery pack B2, so as to keep the output voltage of the first battery pack B1 and the output voltage of the second battery pack B2 balanced when each load Loud is working normally.

[0055] It should be understood that the control module is also connected with the control end of each first power conversion module S1 and the control end of each second power conversion module S2 respectively, so as to realize the control of the output power of any first power conversion module S1 and the control of the output power of any second power conversion module S2, thereby adjusting the power received by each load Loud to the corresponding required power.

[0056] It should be noted that in the embodiment, the first battery pack B1 and the second battery pack B2 are still in series, so the current through the first battery pack B1 and the second battery pack B2 is still the same. The power output by the first battery pack B1 is output to the load Loud connected to each first power conversion module S1 through each first power conversion module S1, and the power output by the second battery pack B2 is output to the load Loud connected to each second power conversion module S2 through each second power conversion module S2. According to each load Loud as the core, it can be regarded as a combination of the connection structure of the parallel multiple groups of first power conversion modules S1 and second power conversion modules S2 in the first embodiment. In each group, the number of first power conversion modules S1, second power conversion modules S2 and loads Loud remains the same.

[0057] It is easy to understand that in the embodiment, the first battery pack B1 can be connected with a plurality of first power conversion modules S1, each of which is connected with a load Loud respectively, so that the first battery pack B1 can output power to the corresponding loads Loud respectively, and the power provided by the first battery pack B1 received by each load Loud is controlled by the corresponding first power conversion module S1; similarly, the second battery pack B2 can also be connected with a plurality of second power conversion modules S2, each of which is connected with a load Loud respectively, so that the second battery pack B2 can output power to the corresponding loads Loud respectively, and the power provided by the second battery pack B2 received by each load Loud is controlled by the corresponding second power conversion module S2. Each load Loud is connected with a first power conversion module S1 and a second power conversion module S2, that is, simultaneously obtains the power output by the first battery pack B1 controlled by the corresponding first power conversion module S1 and the power output by the second battery pack B2 controlled by the corresponding second power conversion module S2. At the same time, the sum of the power output by the first battery pack B1 to each load Loud controlled by each first power conversion module S1 is the total power output by the first battery pack B1, and the sum of the power output by the second battery pack B2 to each load Loud controlled by each second power conversion module S2 is the total power output by the second battery pack B2. In a specific implementation, it can be understood that each first power conversion module S1 controls the total power output by the first battery pack B1 to be half of the total demand power of the loads, and at the same time, each second power conversion module S2 controls the total power output by the second battery pack B2 to also be half of the total demand power of the loads, and the first battery pack B1 and the second battery pack B2 are connected in series, so the current passing through them is equal, and therefore the voltage across the first battery pack B1 and the voltage across the second battery pack B2 are still equal. Through the circuit structure provided in the embodiment, the first battery pack B1 and the second battery pack B2 connected in series can still maintain voltage balance when supplying power to multiple loads Loud at the same time, thereby improving the service life of the battery.

[0058] It is worth noting that in the embodiment, the power output by each first power conversion module S1 to the corresponding load Loud can be different, and correspondingly, the power output by each second power conversion module S2 to the corresponding load Loud can also be different, that is, the first battery pack B1 and the second battery pack B2 can provide different power to different loads Loud. However, for the same load Loud, the demand power received needs to be equal to the sum of the output power of the corresponding first power conversion module S1 and the output power of the corresponding second power conversion circuit S2, and this control method requires high control of the power delivered by each power conversion module to each load Loud.

[0059] Furthermore, in this embodiment, the control module is also used to adjust the output power of the first power conversion module S1 in each group to be the same as the output power of the corresponding second power conversion module S2 when the voltages across the first battery pack B1 and the second battery pack B2 are in a balanced state.

[0060] It should be noted that, in this embodiment, in order to reduce the difficulty of controlling the total output power of the first battery pack B1 by each first power conversion module S1 and the total output power of the second battery pack B2 by each second power conversion module S2, the control module can control the output power of each first power conversion module S1 and the output power of each second power conversion module S2 according to the power requirements of each load Loud, so that the voltage across the two battery packs remains balanced while the load Loud is working.

[0061] Based on the first and / or second embodiments of this application, in the third embodiment of this application, the content that is the same as or similar to that in embodiments one and two above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 The battery voltage balancing circuit further includes: a first voltage regulator module W1;

[0062] The input terminal of the first voltage regulator module W1 is connected to the output terminal of the first battery pack B1, and the output terminal of the first voltage regulator module W1 is connected to the input terminal of the first power conversion module S1.

[0063] The first voltage regulator module W1 is used to regulate the output voltage of the first battery pack B1 and transmit it to the first power conversion module S1.

[0064] It should be understood that, reference Figure 3 Specifically, the above circuit structure can be understood as follows: the positive input terminal of the first voltage regulator module W1 is connected to the positive terminal of the first battery pack B1, the negative input terminal of the first voltage regulator module W1 is connected to the negative terminal of the first battery pack B1, the positive output terminal of the first voltage regulator module W1 is connected to the positive input terminal of each first power module, and the negative output terminal of the first voltage regulator module W1 is connected to the negative input terminal of each first power module.

[0065] It should be noted that, in this embodiment, a first voltage regulator module W1 can also be provided between the first battery pack B1 and the first power conversion module S1. When the first battery pack B1 is working, its output voltage fluctuates with changes in remaining charge, load volume, and external factors (such as temperature). The first voltage regulator module W1 can regulate the first battery voltage output by the first battery pack B1 and transmit the regulated first battery voltage to the first power conversion module S1 to ensure the stability and reliability of the first power conversion module S1. It can also reduce energy loss during operation and improve the efficiency of the first power conversion module S1. Furthermore, it can reduce the design complexity of the internal structure of the first power conversion module S1 and save on manufacturing costs.

[0066] It is worth noting that in this embodiment, the first voltage regulator module W1 may have an isolation function to isolate the first battery pack B1 from the first power conversion module S1, so as to prevent the two from causing electrical signal interference to each other.

[0067] Furthermore, in this embodiment, the first voltage regulator module W1 is also used to regulate the output voltage of the first battery pack B1 and transmit it to the first power conversion module S1.

[0068] It should be noted that different operating parameters of the first power conversion module S1 can be selected for loads Loud with different power requirements. However, different operating parameters of the first power conversion module S1 have certain limitations on the input voltage range. If the voltage is too high or too low, the efficiency and safety of the first power conversion module S1 will be reduced. In this embodiment, the first voltage regulator module W1 also has a voltage regulation function. The first voltage regulator module W1 can regulate the first battery voltage to a first target voltage that meets the current operating requirements of the first power conversion module S1. This allows the first power conversion module S1 to efficiently and safely adjust the power output from the first battery pack B1 to the load Loud to the target power when it receives the first target voltage.

[0069] Furthermore, in this embodiment, the battery voltage balancing circuit further includes: a second voltage regulator module W2;

[0070] The input terminal of the second voltage regulator module W2 is connected to the output terminal of the second battery pack B2, and the output terminal of the second voltage regulator module W2 is connected to the input terminal of the second power conversion module S2.

[0071] The second voltage regulator module W2 is used to regulate the output voltage of the second battery pack B2 and transmit it to the second power conversion module S2.

[0072] It should be understood that, referenceFigure 3 The above connection method can be understood as connecting the positive input terminal of the second voltage regulator module W2 to the positive terminal of the second battery pack B2, connecting the negative input terminal of the second voltage regulator module W2 to the negative terminal of the second battery pack B2, connecting the positive output terminal of the second voltage regulator module W2 to the positive input terminal of each second power module, and connecting the negative output terminal of the second voltage regulator module W2 to the negative input terminal of each second power module.

[0073] It should be noted that, similar to the above, in this embodiment, a second voltage regulator module W2 can also be provided between the second battery pack B2 and the second power conversion module S2. When the second battery pack B2 is working, its output voltage fluctuates with changes in remaining charge, load volume, and external factors (such as temperature). The second voltage regulator module W2 can regulate the second battery voltage output by the second battery pack B2 and transmit the regulated second battery voltage to the second power conversion module S2, ensuring the stability and reliability of the second power conversion module S2's operation. It also improves the energy consumption of the second power conversion module S2 during operation, thus increasing its efficiency. Furthermore, it reduces the design complexity of the internal structure of the second power conversion module S2, saving on manufacturing costs.

[0074] It is worth noting that in this embodiment, the second voltage regulator module W2 may have an isolation function to isolate the second battery pack B2 from the second power conversion module S2, so as to prevent the two from causing electrical signal interference to each other.

[0075] Furthermore, in this embodiment, the second voltage regulator module W2 is also used to regulate the output voltage of the second battery pack B2 and transmit it to the second power conversion module S2.

[0076] It is easy to understand that, similar to the above situation, for loads Loud with different power requirements, second power conversion modules S2 with different operating parameters can be selected. However, different operating parameters of the second power conversion modules S2 have certain limitations on the input voltage range. If the voltage is too high or too low, the operating efficiency and safety of the second power conversion module S2 will be reduced. In this embodiment, the second voltage regulator module W2 also has a voltage regulation function. The second voltage regulator module W2 can regulate the second battery voltage to a second target voltage that meets the current operating requirements of the second power conversion module S2. This allows the second power conversion module S2 to efficiently and safely adjust the power output from the second battery pack B2 to the load Loud to the target power when it receives the second target voltage.

[0077] It is worth noting that, in this embodiment, as Figure 4As shown, the technical solution of Embodiment 3 of this application can be combined with the technical solution of Embodiment 2. That is, the first battery pack B1 can be connected to multiple first power conversion modules S1 simultaneously through the first voltage regulator module W1. Correspondingly, the second battery pack B2 can be connected to multiple second power conversion modules S2 simultaneously through the second voltage regulator module W2, and there are also multiple loads, each load being connected to one first power conversion module S1 and one second power conversion module S2 respectively. This solution has all the beneficial effects brought by Embodiments 2 and 3 of this application, which will not be elaborated here.

[0078] Furthermore, in this embodiment, both the first power conversion module S1 and the second power conversion module S2 are DC-DC converters.

[0079] It is easy to understand that in this embodiment, the first power conversion module S1 can specifically be a DC-DC converter, and the second power conversion module S2 can also be the same or a similar DC-DC converter. The output power of the DC-DC converter can be changed by adjusting the switching frequency and duty cycle of the input DC-DC converter, thereby controlling the output power of the first battery pack B1 and the second battery pack B2 respectively.

[0080] Furthermore, to achieve the above objectives, this application also proposes a battery voltage equalization device, which employs all embodiments of the battery voltage equalization circuit described above. Compared with the prior art, the beneficial effects of the battery voltage equalization device provided in this application are the same as those of the battery voltage equalization circuit provided in the above embodiments, and other technical features of the battery voltage equalization device are the same as those disclosed in the above embodiments, and will not be repeated here.

[0081] Furthermore, to achieve the above objectives, this application also proposes a battery voltage equalization system, wherein the battery voltage equalization device adopts all embodiments of the battery voltage equalization device described above. Compared with the prior art, the beneficial effects of the battery voltage equalization system provided in this application are the same as those of the battery voltage equalization device provided in the above embodiments, and other technical features of the battery voltage equalization system are the same as those disclosed in the above embodiments, and will not be repeated here.

[0082] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. A battery voltage equalization circuit, characterized in that, The battery voltage equalization circuit includes: a first battery pack, a second battery pack, a control module, a first power conversion module, a second power conversion module, and a load; wherein... The first battery pack and the second battery pack are connected in series; The input terminal of the first power conversion module is connected to the output terminal of the first battery pack, the input terminal of the second power conversion module is connected to the output terminal of the second battery pack, and the output terminals of the first power conversion module and the second power conversion module are connected in parallel to the power supply input terminal of the load. The control module is connected to the output terminals of the first battery pack, the second battery pack, the control terminal of the first power conversion module, and the control terminal of the second power conversion module, respectively. It is used to adjust the output power of the first power conversion module and the second power conversion module according to the working power of the load, the output voltage of the first battery pack, and the output voltage of the second battery pack, so as to keep the output voltage of the first battery pack and the output voltage of the second battery pack balanced when the load is working normally.

2. The battery voltage equalization circuit as described in claim 1, characterized in that, The battery voltage equalization circuit further includes: multiple first power conversion modules, an equal number of second power conversion modules, and an equal number of loads; The input terminals of each of the first power conversion modules are interconnected, and the input terminals of each of the second power conversion modules are interconnected. Each of the first power conversion modules, each of the second power conversion modules, and each of the loads are grouped in a one-to-one correspondence. Within each group, the output terminals of the first power conversion module and the second power conversion module are connected to the load; The control module is also connected to the control terminals of each of the first power conversion modules and each of the second power conversion modules, respectively, and is used to adjust the output power of each of the first power conversion modules and each of the second power conversion modules according to the working power of each load, the output voltage of the first battery pack and the output voltage of the second battery pack, so as to keep the output voltage of the first battery pack and the output voltage of the second battery pack balanced when each load is working normally.

3. The battery voltage equalization circuit as described in claim 1, characterized in that, The battery voltage equalization circuit further includes: a first voltage regulator module; The input terminal of the first voltage regulator module is connected to the output terminal of the first battery pack, and the output terminal of the first voltage regulator module is connected to the input terminal of the first power conversion module. The first voltage regulator module is used to regulate the output voltage of the first battery pack and transmit it to the first power conversion module.

4. The battery voltage equalization circuit as described in claim 3, characterized in that, The first voltage regulator module is also used to regulate the output voltage of the first battery pack and transmit it to the first power conversion module.

5. The battery voltage equalization circuit as described in claim 1, characterized in that, The battery voltage equalization circuit also includes: a second voltage regulator module; The input terminal of the second voltage regulator module is connected to the output terminal of the second battery pack, and the output terminal of the second voltage regulator module is connected to the input terminal of the second power conversion module; The second voltage regulator module is used to regulate the output voltage of the second battery pack and transmit it to the second power conversion module.

6. The battery voltage equalization circuit as described in claim 5, characterized in that, The second voltage regulator module is also used to regulate the output voltage of the second battery pack and transmit it to the second power conversion module.

7. The battery voltage equalization circuit as described in claim 1, characterized in that, Both the first power conversion module and the second power conversion module are DC-DC converters.

8. A battery voltage equalization device, characterized in that, The battery voltage equalization device adopts the battery voltage equalization circuit as described in any one of claims 1-7.

9. A battery voltage equalization system, characterized in that, The battery voltage equalization system uses the battery voltage equalization device as described in claim 8.

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