Multi-output voltage battery pack and voltage balancing device thereof

Abstract

The utility model discloses a multi-output-voltage battery pack and a voltage balancing device thereof, relates to the technical field of battery packs, is used for realizing voltage balancing among battery cells so as to avoid the phenomenon that the battery cells of the existing multi-output-voltage battery pack possibly charge and discharge mutually, and provides the voltage balancing device of the multi-output-voltage battery pack. According to the battery cell equalization circuit, the equalization circuits and the controllers which are connected with the battery cells in a one-to-one correspondence manner are arranged, so that voltage detection of each group of battery cells is performed through the independent controllers, communication connection among the controllers is realized in cooperation with the communication circuits, and independent voltage equalization control among each group of battery cells is realized. According to the scheme, when the voltage imbalance problem of the multiple groups of battery cells in the battery pack occurs, the voltage balance among the groups of battery cells can be realized, so that the possible problems of mutual charging and discharging of the battery cells and the like during the subsequent parallel use of the groups of battery cells are effectively avoided, and the working safety and reliability of the multi-output voltage battery pack are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a multi-output voltage battery pack and a voltage equalization device thereof. Background Art

[0002] At present, many electrical devices are powered by battery packs for portability and flexibility. In order to improve its power supply capacity, the battery pack usually contains multiple sets of parallel battery cells to achieve higher voltage output and longer battery life.

[0003] However, this type of battery pack with multiple groups of cells connected in parallel also has a potential risk. That is, after the battery pack has been used for a period of time, the voltages of the multiple groups of cells may become unbalanced due to factors such as circuit power consumption and self-discharge, especially for multi-output voltage battery packs.

[0004] A multi-output voltage battery pack can achieve multiple voltage outputs by combining multiple groups of internal cells in series or in parallel to adapt to a variety of tools with different supply voltage requirements. When the groups of cells in a multi-output voltage battery pack have voltage imbalances due to series use or other reasons, and these cells with uneven voltages need to be used in parallel, multiple groups of cells may charge and discharge each other, causing damage to the battery pack and even safety hazards.

[0005] Therefore, technicians in this field are in urgent need of a voltage balancing device for a multi-output voltage battery pack to overcome the voltage imbalance problem that may occur when the multi-output battery pack is used in series or parallel. Utility Model Content

[0006] The utility model aims to provide a multi-output voltage battery pack and a voltage equalization device thereof, which are used to overcome the voltage imbalance problem that may occur when the multi-output battery pack is used in series or parallel.

[0007] In order to solve the above technical problems, the utility model provides a multi-output voltage battery pack voltage equalization device, including: a controller, an equalization circuit and a communication circuit;

[0008] Wherein, the controller and the balancing circuit both correspond one-to-one to the multiple groups of cells in the multi-output voltage battery pack; the controller includes a master controller and at least one slave controller, and the master controller is connected to each slave controller through a communication circuit;

[0009] The balancing circuit is connected to the positive terminal of the corresponding battery cell, and the controller is respectively connected to the positive terminal of the corresponding battery cell and the control terminal of the balancing circuit;

[0010] The master controller is connected to each slave controller via a communication circuit.

[0011] On the one hand, it also includes: registers;

[0012] The register stores a balanced on voltage and a balanced off voltage;

[0013] When the register is one, the register is connected to the main controller;

[0014] When there are multiple registers, the registers are connected to each controller in a one-to-one correspondence; and a main controller identifier is stored in one of the registers.

[0015] On the other hand, the balancing circuit is a bleeder circuit.

[0016] On the other hand, the discharge circuit includes: a discharge resistor and a switch tube;

[0017] Among them, one end of the discharge resistor is connected to the positive terminal of the battery cell corresponding to the discharge circuit, and the other end is grounded through the switch tube;

[0018] The control end of the switch tube is connected to the corresponding controller.

[0019] On the other hand, the discharge circuit further comprises: a light emitting diode;

[0020] The light emitting diode is arranged between the switch tube and the ground, and the positive terminal of the light emitting diode is connected to the switch tube and the negative terminal is grounded.

[0021] On the other hand, it also includes: an enabling circuit disposed in the output loop of each battery cell;

[0022] Wherein, the control end of each enabling circuit is connected to the main controller.

[0023] On the other hand, the enabling circuit includes: a switch tube and a photocoupler;

[0024] The switch tube is arranged in the output loop of the battery cell, and the control end of the switch tube is connected to one end of the photoelectric coupler, and the other end of the photoelectric coupler is connected to the main controller.

[0025] In order to solve the above technical problems, the utility model also provides a multi-output voltage battery pack, including a plurality of battery cells and the multi-output voltage battery pack voltage balancing device described above.

[0026] On the one hand, it also includes: an isolation module;

[0027] The positive terminal of each battery cell is connected to an independent output circuit, and the negative terminal of each battery cell is grounded through an isolation module.

[0028] On the other hand, the isolation module is a photocoupler.

[0029] The utility model provides a voltage balancing device for a multi-output voltage battery pack, which is provided with a balancing circuit and a controller connected one-to-one with each group of battery cells in the multi-output voltage battery pack, so that the voltage detection of each group of battery cells is performed by an independent controller, and the communication connection between each controller is realized in conjunction with a communication circuit, so that each controller can realize independent voltage balancing control between each group of battery cells by controlling the corresponding balancing circuit. This solution can realize voltage balancing between each group of battery cells after each group of battery cells in the multi-output voltage battery pack is used in series and when voltage imbalance occurs in multiple groups of battery cells inside the battery pack, thereby effectively avoiding the problems of mutual charging and discharging of battery cells that may occur when each group of battery cells is used in parallel later, and further improving the safety and reliability of the operation of the multi-output voltage battery pack.

[0030] The multi-output voltage battery pack provided by the present invention corresponds to the above-mentioned voltage equalization device and has the same effect as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A structural diagram of a multi-output voltage battery pack voltage balancing device provided by the utility model;

[0033] Figure 2 A structural diagram of an equalizing circuit provided by the utility model;

[0034] FIG3( a ) is a structural diagram of a communication circuit of a main controller receiving end provided by the present invention;

[0035] FIG3( b ) is a structural diagram of a communication circuit of a slave controller receiving end provided by the present invention;

[0036] FIG4( a ) is a structural diagram of a power supply part of a main controller provided by the utility model;

[0037] FIG4( b ) is a structural diagram of a power supply part of a slave controller provided by the present invention;

[0038] FIG5( a ) is a diagram showing the connection relationship of the pins of a main controller provided by the present invention;

[0039] FIG5( b ) is a pin connection diagram of a slave controller provided by the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0041] The core of the utility model is to provide a multi-output voltage battery pack and a voltage equalization device thereof.

[0042] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] At present, in order to improve the flexibility and portability of electrical equipment and to make electrical equipment suitable for a wider range of scenarios, it is common to use battery packs to power electrical equipment to get rid of dependence on fixed power sources. As for battery packs, multiple groups of parallel cells are usually set up to improve the power supply capacity of the power supply. In particular, for a multi-output voltage battery pack, it is necessary to achieve outputs of different voltage levels through the combination of multiple cells. However, in actual applications, these cells may have voltage imbalance problems due to various reasons. At this time, it will cause the cells with uneven voltages to charge and discharge each other, thereby damaging the battery pack and even causing more serious safety hazards.

[0044] In order to solve the above problems, the utility model provides a multi-output voltage battery pack voltage balancing device, such as Figure 1 As shown, it includes: a controller, a balancing circuit and a communication circuit;

[0045] Wherein, the controller and the balancing circuit both correspond one-to-one to the multiple groups of cells in the multi-output voltage battery pack; the controller includes a master controller and at least one slave controller, and the master controller is connected to each slave controller through a communication circuit;

[0046] The balancing circuit is connected to the positive terminal of the corresponding battery cell, and the controller is respectively connected to the positive terminal of the corresponding battery cell and the control terminal of the balancing circuit;

[0047] The master controller is connected to each slave controller via a communication circuit.

[0048] It is not difficult to see that the voltage equalization device provided by the utility model is provided with a controller for collecting the voltage information of the battery cell for each battery cell in the multi-output voltage battery pack, so as to grasp the voltage condition of the corresponding battery cell. And each controller includes a master controller, and the others are slave controllers. The master controller establishes a communication connection with the other slave controllers through a communication circuit to ensure the data commonality between the controllers, and also enables each controller to know the voltage condition of other unconnected batteries, so as to realize the judgment whether voltage equalization is needed.

[0049] It should be noted that the utility model adopts a multi-controller setting, the purpose of which is to adapt to the need for multiple groups of battery cells in a multi-output voltage battery pack to be able to be freely combined in series and parallel. Multiple controllers are used to detect the voltage of each battery cell individually and control the balanced voltage individually, so that in the actual application of the multi-output voltage battery pack, the battery cells used in combination can be freely selected and the series and parallel connection mode can be freely determined according to needs, and an effective voltage balancing effect can still be achieved.

[0050] Furthermore, the communication connection between the master controller and each slave controller adopted by the utility model is also to adapt to the characteristics of the above-mentioned multi-controller setting, and its purpose is also to simplify the communication structure of the voltage balancing device, reduce the wiring complexity and circuit area. If only the problem of realizing data intercommunication between multiple controllers is considered, it is not necessary to set up a master controller, and the purpose can also be achieved by connecting the two controllers to each other.

[0051] Furthermore, although the present invention does not impose strict restrictions on the specific implementation of each circuit structure involved in the present invention, possible implementation schemes are also provided:

[0052] For example, for a controller, its application requirements are to be able to detect the cell voltage, compare the voltages, and determine whether to enable a balancing circuit, so a common microcontroller unit (MCU) and other control devices can be used.

[0053] For the balancing circuit, its application requirement is to achieve voltage balancing between cells, that is, the balancing circuit needs to be able to change the voltage of the corresponding cell. Based on this, this embodiment provides a possible implementation scheme of the balancing circuit: the balancing circuit is specifically a discharge circuit.

[0054] That is, in this embodiment, the balancing circuit discharges the electric energy of the connected battery cell to achieve the purpose of reducing the voltage of the corresponding battery cell. In the voltage balancing scenario, the discharge circuit can discharge the electric energy of the battery cell with higher voltage to achieve voltage balancing between the battery cells. That is, in this implementation scheme, the controller's balancing circuit enable logic should be:

[0055] When it is determined that the voltage of the corresponding battery cell is higher than the voltages of other battery cells, the balancing circuit is enabled to discharge the electric energy of the corresponding battery cell until the voltage of the corresponding battery cell is equal to the voltages of other battery cells.

[0056] Similarly, the equalization circuit using another equalization logic can be a charging circuit, which realizes voltage equalization between cells by charging low-voltage cells. Its principle and control logic are similar to those of the above-mentioned discharge circuit embodiment, and this embodiment will not be repeated. Compared with the charging circuit, the discharge circuit has more advantages in the complexity of the circuit structure and ease of implementation.

[0057] Furthermore, for the specific implementation of the above-mentioned balancing circuit as a discharge circuit, this embodiment also provides a preferred implementation scheme, the above-mentioned discharge circuit is as follows: Figure 2 As shown, it specifically includes: a bleeder resistor and a switch tube;

[0058] Among them, one end of the discharge resistor is connected to the positive terminal of the battery cell corresponding to the discharge circuit, and the other end is grounded through the switch tube;

[0059] The control end of the switch tube is connected to the corresponding controller.

[0060] Based on the above circuit, it can be seen that when the controller outputs a specific enable signal (such as a high-level signal) to the control end of the switch tube, the switch tube is turned on, and the positive end of the battery cell is equivalent to being directly grounded through the discharge resistor, thereby achieving the purpose of discharging discharge energy.

[0061] Based on the discharge circuit shown in the above embodiment, this embodiment also provides a further implementation scheme, wherein the discharge circuit further includes: a light emitting diode;

[0062] The light emitting diode is arranged between the switch tube and the ground, and the positive terminal of the light emitting diode is connected to the switch tube and the negative terminal is grounded.

[0063] Based on the setting position of the light-emitting diode added in this embodiment, it can be known that when the switch tube is turned on (that is, when the discharge circuit starts to discharge the electrical energy of the discharge cell), the light-emitting diode is powered and emits light, thereby achieving the purpose of indicating the working status of the discharge circuit, making it convenient for the user of the battery pack to better understand the voltage balance status of the battery pack.

[0064] As for the communication circuit, it can be known from the above that the controller can be implemented by common control devices such as MCU. As for control devices such as MCU, they usually have functions such as serial port communication. Data interaction can be achieved by correspondingly connecting the serial port data receiving end and the sending end of the two MCUs. However, as mentioned above, one of the main application scenarios of the voltage balancing device provided by the utility model is to meet the voltage balancing needs in multi-output voltage battery packs; the battery cells in the multi-output voltage battery pack need to be freely combined according to actual use needs, and the controller is to ensure the one-to-one correspondence between the battery cells for the above purpose. Changes in the connection relationship between the battery cells directly affect the connection relationship between the controllers; so in order to realize arbitrary changes in the connection relationship between the controllers and still ensure data communication, this embodiment provides a possible implementation plan for a communication circuit. The communication circuit is shown in Figure 3, including: a photoelectric coupler;

[0065] Each photocoupler is arranged between the communication terminals of each controller to isolate the signals between the controllers. When the combined connection relationship between the battery cells needs to be changed, the communication structure between the controllers can also be changed accordingly.

[0066] It can be seen that the voltage balancing device provided by the utility model detects the voltage condition of each battery cell through a controller; then realizes data interaction between the controllers through a communication circuit, shares the battery cell voltage information, and compares the voltage sizes between the battery cells to determine whether they are balanced; if they are unbalanced, the corresponding battery cell voltages are balanced by enabling the corresponding balancing circuit; thereby ensuring the voltage balance between multiple battery cells in the battery pack, and when the battery cells are connected in parallel to output voltage, the phenomenon of mutual charging and discharging is avoided, thereby ensuring the safety of the battery pack.

[0067] In addition, the voltage balancing device of the present invention also adopts a multi-controller control method in view of the characteristics of the multi-output voltage battery pack, so as to ensure that the multi-output voltage battery pack can ensure the balancing effect when the battery cells are connected in series or parallel in any combination. Furthermore, in order to reduce the circuit complexity brought by the multiple controllers, the present invention adopts a one-master-multiple-slave (or one-slave) design, where only the master controller communicates with each slave controller, and each slave controller does not communicate with each other, thereby simplifying the communication circuit structure and better adapting to the actual application needs of the multi-output voltage battery pack.

[0068] On the other hand, the enabling logic based on the above controller is further described in this embodiment. Taking the balancing circuit as a discharge circuit and the balancing process as the process of discharging electric energy from a high-voltage battery cell as an example, the logic or workflow of each controller to achieve voltage balancing can be:

[0069] First, each controller detects the voltage at the positive terminal of the corresponding connected battery cell to determine its own battery cell voltage; secondly, each slave controller sends the detected battery cell voltage to the master controller; at this time, the master controller knows the voltage size of all battery cells in the battery pack, and the master controller can compare the voltage of each battery cell, and determine the minimum battery cell voltage ("minimum" is based on the balancing logic that the discharge circuit discharges high-voltage batteries to balance the voltage), and feeds back the minimum battery cell voltage to all slave controllers; thereafter, all controllers (including the master controller) compare the size relationship between their own battery cell voltage and the minimum battery cell voltage. If it is greater, the corresponding connected balancing circuit is enabled until the own battery cell voltage is equal to the minimum battery cell voltage, and if it is equal, it does not act; finally, when all controllers no longer act, the voltage balancing process of the battery pack is completed.

[0070] Furthermore, the above-mentioned cell balancing logic is relatively absolute, and must require that the voltages of all cells are exactly the same (that is, the balancing completion condition is met when the corresponding cell voltage is "equal to" the minimum cell voltage). This is difficult to achieve in practical applications, and it is easy to cause excessive discharge of electric energy, which ultimately affects the use of the battery pack. Therefore, this embodiment provides a further implementation scheme, wherein the above-mentioned voltage balancing device also includes: a register;

[0071] The register stores a balanced on voltage and a balanced off voltage;

[0072] When the register is one, the register is connected to the main controller;

[0073] When there are multiple registers, the registers are connected to each controller in a one-to-one correspondence.

[0074] That is, this embodiment is provided with a balancing range, that is, voltage balancing is started when the voltage difference exceeds the balancing start voltage, and voltage balancing is stopped when the voltage difference is lower than the balancing stop voltage, at which time the voltages of the two cells are considered to be "balanced". Based on this, the balancing stop voltage usually needs to be less than or equal to the balancing start voltage, otherwise the problem of balancing being turned off immediately after being turned on may occur, and additional settings need to be made to avoid meaningless voltage balancing settings.

[0075] Based on the configuration of this embodiment, the voltage balancing condition is expanded by storing the balancing start voltage and the balancing stop voltage in the register, so as to avoid the problem that the electric energy between the cells is balanced but cannot be "equal" due to the balancing condition being too absolutely harsh. Since the principle of voltage balancing is nothing more than charging the low-voltage cell or discharging the high-voltage cell, avoiding the above problems also avoids the problems of cell explosion caused by overcharging and battery pack use affected by overdischarging, thus better ensuring the safety and reliability of the battery pack.

[0076] In addition, this embodiment also provides different setting schemes when there are one or more registers, so as to flexibly adapt to actual needs and achieve the above technical effects. In particular, this embodiment also provides a further implementation scheme for the implementation of multiple registers:

[0077] In one of the registers is stored the master controller identification.

[0078] It can be seen from the above embodiments that the controller in the voltage equalization device has a master-slave design. Although the master controller can be determined from the connection relationship (only the master controller and each slave controller are connected in communication, and other slave controllers are not connected in communication). However, considering that this connection relationship can be changed (for example, the settings of the photoelectric coupler and the like of the communication circuit in the above embodiments are all efforts made to adapt to the flexible combination of series and parallel between the cells of the output voltage battery pack), the identities of the master and slave controllers are not static. And because the control logic of the master controller and the slave controller are different, in order to enable each controller to know its own identity and facilitate the subsequent adjustment of the master controller, the master controller identifier is stored in the register so that the corresponding connected controller can know that it is the master controller. When the master controller is changed later, there is no need to re-enter the control logic. It only needs to change the storage position of the master controller identifier in different registers to achieve rapid changes and facilitate later maintenance.

[0079] On the other hand, for the voltage equalization device provided by the present invention, the voltage equalization process usually needs to be performed during the time period when the battery pack is not supplying power to the electrical equipment. After the voltage equalization is completed, the user can choose whether to intervene in the electrical equipment to use the battery pack as needed.

[0080] Based on this, this embodiment also provides a preferred implementation scheme, wherein the voltage equalization device further comprises: an enabling circuit arranged in the output loop of each battery cell;

[0081] Wherein, the control end of each enabling circuit is connected to the main controller.

[0082] The enabling circuit is used to control the output enable of the battery cell, and is also connected to the battery cell one by one, and is uniformly controlled by the main controller. It is easy to know that after the required battery cells are combined in series and parallel, the working states of the battery cells in all combinations need to be consistent, that is, they work or sleep at the same time. At this time, a controller can be used to uniformly enable the control to ensure the coordination and consistency of the working states of each battery cell. In this embodiment, the main controller is selected as the above-mentioned battery cell enabling controller.

[0083] Furthermore, for the specific implementation of the enabling circuit, this embodiment also provides a possible implementation scheme, as shown in FIG4 , the enabling circuit includes: a switch tube and a photocoupler;

[0084] The switch tube is arranged in the output loop of the battery cell, and the control end of the switch tube is connected to one end of the photoelectric coupler, and the other end of the photoelectric coupler is connected to the main controller.

[0085] That is, each controller controls the on and off of the switch tube by inputting different signals to the control end of the switch tube, thereby realizing the enabling control of the cell output. When the switch tube is turned off, the external output channel of the cell is turned off, and the cell enters a dormant state. Conversely, the cell is controlled to enter a working state, so that when the cell has not started to balance, it can choose whether to sleep as needed, further reducing the energy loss of the cell.

[0086] The photocoupler is also due to the flexibility requirements of multi-output voltage battery packs. In order to adapt to the flexible series and parallel combinations between battery cells, various circuits corresponding to the battery cells need to make efforts in flexibility. The photocoupler serves to improve the flexibility of the enabling circuit, and the photocoupler can also isolate the signals at both ends to achieve signal communication and control between different voltage domains.

[0087] It should also be noted that the enabling circuit may include not only a switch tube and a photocoupler, but also other circuit elements such as resistors may be added as shown in FIG4 as required by the actual circuit. In addition, FIG4 also includes the voltage detection part of the controller for the battery cell, so the circuit shown in FIG4 can also be called the power supply part of the voltage equalization device. In addition, the two circuits shown in FIG4 are respectively the power supply circuit of the main controller and the power supply circuit of the slave controller from the left. The difference is that the enabling control terminal of the main controller is not isolated from the switch tube by a photocoupler, but is implemented by a triode as an optional implementation scheme.

[0088] Further, in combination with the above embodiment, the pin connection relationship of the controller is shown in FIG5 :

[0089] The controllers all include voltage detection terminals (V1~VN), equalization circuit enable terminals (B_C1~B_CN) and serial communication terminals (the master controller is the transmitter U_TX and the receiver U_RX, and the slave controller is the transmitter D_TX and the receiver D_RX); in particular, the master controller also includes a cell enable terminal (EN).

[0090] In this embodiment, the control of whether each battery cell in the battery pack is in sleep mode is implemented through an enabling circuit. In addition to voltage balancing, in order to avoid unnecessary loss of battery cell power, the controller can put the battery cell into sleep mode through the enabling circuit, thereby avoiding this situation and better meeting the use needs of the battery pack.

[0091] In the above embodiment, a multi-output voltage battery pack voltage equalization device is provided, and its specific implementation scheme is described in detail. In this embodiment, a multi-output voltage battery pack corresponding to the voltage equalization device provided in the above embodiment is also provided, including: multiple groups of battery cells and the voltage equalization device described in the above embodiment, which can bring the same technical effect as the above voltage equalization device.

[0092] Since the multi-output voltage battery pack provided in this embodiment may include the voltage balancing device of any of the above embodiments, please refer to the above voltage balancing device section for the specific implementation scheme, and this embodiment will not be repeated. Further, this embodiment describes other implementation schemes of the multi-output voltage battery pack:

[0093] As described in some embodiments of the voltage equalization device, a major application requirement of a multi-output voltage battery pack is to achieve voltage outputs of different voltage levels by combining cells in any series or parallel connection. Therefore, in order to meet the need for any series or parallel connection of cells, this embodiment provides a possible implementation scheme, as shown in FIG4 , wherein the multi-output voltage battery pack further includes: an isolation module;

[0094] The positive terminal of each battery cell is connected to an independent output circuit, and the negative terminal of each battery cell is grounded through an isolation module.

[0095] Furthermore, the above-mentioned isolation module can select a photocoupler. Based on the setting of the isolation module, the negative terminal of each battery cell is not directly connected to the ground, that is, the negative terminals of each battery cell are not directly connected. Furthermore, the positive terminal of each battery cell has an enabling circuit to independently control its output, so the positive terminals of each battery cell are not directly connected, which provides the possibility of arbitrary series and parallel connection between battery cells, greatly improving the flexibility of battery cell use and battery pack voltage output, and meeting the practical application needs of multi-output voltage battery packs.

[0096] The above is a detailed introduction to a multi-output voltage battery pack and a voltage equalization device thereof provided by the utility model. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can refer to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0097] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A voltage balancing device for a multi-output voltage battery pack, characterized in that: include: Controller, equalization circuit and communication circuit; Wherein, the controller and the balancing circuit both correspond one-to-one to multiple groups of battery cells in the multi-output voltage battery pack; the controller includes a master controller and at least one slave controller, and the master controller is communicatively connected with each of the slave controllers through the communication circuit; The balancing circuit is connected to the positive terminal of the corresponding battery cell, and the controller is respectively connected to the positive terminal of the corresponding battery cell and the control terminal of the balancing circuit; The master controller is connected to each of the slave controllers via the communication circuit.

2. The multi-output voltage battery pack voltage equalization device according to claim 1, characterized in that: Also includes: register; The register stores a balanced on voltage and a balanced off voltage; When the number of the register is one, the register is connected to the main controller; When there are multiple registers, the registers are connected to the controllers in a one-to-one correspondence; and a main controller identifier is stored in one of the registers.

3. The multi-output voltage battery pack voltage equalization device according to claim 1, characterized in that: The balancing circuit is a discharge circuit.

4. The multi-output voltage battery pack voltage balancing device according to claim 3, characterized in that: The discharge circuit comprises: a discharge resistor and a switch tube; Wherein, one end of the discharge resistor is connected to the positive terminal of the battery cell corresponding to the discharge circuit, and the other end is grounded through the switch tube; The control end of the switch tube is connected to the corresponding controller.

5. The multi-output voltage battery pack voltage equalization device according to claim 4, characterized in that: The discharge circuit further includes: a light emitting diode; The light emitting diode is arranged between the switch tube and the ground, and the positive terminal of the light emitting diode is connected to the switch tube, and the negative terminal is grounded.

6. The multi-output voltage battery pack voltage equalization device according to any one of claims 1 to 5, characterized in that: Also includes: An enabling circuit provided in the output loop of each of the battery cells; Wherein, the control end of each enabling circuit is connected to the main controller.

7. The multi-output voltage battery pack voltage equalization device according to claim 6, characterized in that: The enabling circuit includes: a switch tube and a photoelectric coupler; The switch tube is arranged in the output circuit of the battery cell, and the control end of the switch tube is connected to one end of the photoelectric coupler, and the other end of the photoelectric coupler is connected to the main controller.

8. A multi-output voltage battery pack, characterized in that: It comprises a plurality of groups of battery cells and a multi-output voltage battery pack voltage balancing device as claimed in any one of claims 1 to 7.

9. The multi-output voltage battery pack according to claim 8, characterized in that: Also included: an isolation module; The positive terminal of each battery cell is connected to an independent output circuit, and the negative terminal of each battery cell is grounded through an isolation module.

10. The multi-output voltage battery pack according to claim 9, characterized in that: The isolation module is a photoelectric coupler.

Images