Balancing device of battery management system, battery management system and energy storage device

Abstract

The utility model provides an equalization device of a battery management system, the battery management system and an energy storage device, and belongs to the technical field of energy equalization, the equalization device of the battery management system comprises a light-emitting assembly and a photoelectric conversion assembly; one end of the light-emitting component is connected with the battery cell, the other end of the light-emitting component is connected with the analog front end, and the photoelectric conversion component is connected in parallel with two ends of the battery cell; the light-emitting assembly is used for converting balanced energy of the battery cells into light energy, the photoelectric conversion assembly is used for converting the light energy into electric energy, the balanced energy is emitted through the light-emitting assembly, then conversion of the light energy is effectively achieved through the photoelectric conversion assembly, energy recycling is completed, and the problem of energy waste is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy balancing, and in particular to a balancing device of a battery management system, a battery management system and an energy storage device. Background Art

[0002] In the application of energy storage devices such as electric vehicles, lithium-ion batteries are used to provide power sources for on-board auxiliary systems and motors. For the battery management system (BMS) of electric vehicles, the battery balancing function is one of the main functions, and its purpose is to maximize the charging or discharging capacity of the battery pack. By balancing the voltage and current between single cells, the BMS can effectively prevent overcharging or over-discharging, thereby avoiding damage to the battery and extending its service life. At the same time, the balancing function of the BMS system also keeps the battery pack working at the highest efficiency at all times.

[0003] There are two ways for BMS to achieve battery balancing, which are divided into active balancing and passive balancing. Passive balancing generally discharges batteries with higher voltages through resistor discharge, releasing electricity in the form of heat. This method has low cost and simple circuit design.

[0004] However, the method of balancing by dissipating heat through balancing resistors can easily lead to energy waste. Utility Model Content

[0005] The utility model provides an equalizing device of a battery management system, a battery management system and an energy storage device, which are used to solve the defect of energy waste in equalization of the battery management system in the prior art.

[0006] In a first aspect, the utility model provides a balancing device for a battery management system, comprising: a light emitting component and a photoelectric conversion component;

[0007] One end of the light-emitting component is connected to the battery cell, the other end of the light-emitting component is connected to the analog front end, and the photoelectric conversion component is connected in parallel to both ends of the battery cell;

[0008] The light emitting component is used to convert the balanced energy of the battery core into light energy, and the photoelectric conversion component is used to convert the light energy into electrical energy.

[0009] According to the equalization device of a battery management system provided by the utility model, at least one group of light emitting components is provided, and the light emitting components include: a light emitting diode and an equalization resistor;

[0010] The light emitting diode and the balancing resistor are connected in series between the battery cell and the analog front end;

[0011] The light emitting diode is used to convert the balancing energy of the battery cell into light energy, and the balancing resistor is used to protect the light emitting diode.

[0012] According to the equalization device of a battery management system provided by the utility model, when the light emitting components are provided in multiple groups, the multiple groups of light emitting components are connected in parallel.

[0013] According to a balancing device of a battery management system provided by the utility model, the light energy conversion component includes: photovoltaic;

[0014] The photovoltaic is connected in parallel to both ends of the battery core, and the photovoltaic is used to convert the light energy into electrical energy.

[0015] According to a balancing device of a battery management system provided by the utility model, the photovoltaic comprises a solar cell panel;

[0016] The solar cell panels are connected in parallel to the two ends of the battery core, and the solar cell pack is used to convert the light energy into electrical energy.

[0017] According to a battery management system balancing device provided by the utility model, the photovoltaic further includes an energy storage component;

[0018] The energy storage component is connected to the solar panel and the battery cell;

[0019] The energy storage component is used to store the electric energy converted by the solar cell panel.

[0020] According to an equalization device of a battery management system provided by the utility model, when the storage voltage of the energy storage component is greater than the voltage of the battery cell, the energy storage component is used to charge the low-power battery cell.

[0021] According to the utility model, a balancing device for a battery management system further includes a diode;

[0022] The diode is connected in series between the solar cell panel and the battery cell, and is used to prevent the current of the solar cell panel from flowing back.

[0023] In a second aspect, the utility model further provides a battery management system, comprising the equalization device of the battery management system as described in any one of the above items.

[0024] In a third aspect, the utility model further provides an energy storage device, comprising the battery management system as described above.

[0025] The utility model provides a battery management system balancing device, a battery management system and an energy storage device, comprising: a light-emitting component and a photoelectric conversion component; one end of the light-emitting component is connected to a battery cell, the other end of the light-emitting component is connected to an analog front end, and the photoelectric conversion component is connected in parallel to both ends of the battery cell; the light-emitting component is used to convert the balancing energy of the battery cell into light energy, and the photoelectric conversion component is used to convert the light energy into electrical energy, the balancing energy is emitted by the light-emitting component, and then the conversion of light energy is effectively realized by the photoelectric conversion component, thereby completing the recycling of energy and solving the problem of energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a structural schematic diagram of an equalization device of a battery management system provided by an embodiment of the utility model.

[0028] Reference numerals:

[0029] 1. Light-emitting component; 11. Balancing resistor; 12. Light-emitting diode; 2. Photoelectric conversion component; 21. Solar panel; 3. Diode; A. Battery cell; B. Analog front end. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Figure 1 It is a structural schematic diagram of an equalization device of a battery management system provided by an embodiment of the utility model.

[0032] like Figure 1 As shown, the balancing device of the battery management system provided by the embodiment of the utility model includes: a light-emitting component 1 and a photoelectric conversion component 2; one end of the light-emitting component 1 is connected to the battery cell A, the other end of the light-emitting component 1 is connected to the analog front end B, and the photoelectric conversion component 2 is connected in parallel to the two ends of the battery cell A; the light-emitting component 1 is used to convert the balancing energy of the battery cell A into light energy, and the photoelectric conversion component 2 is used to convert the light energy into electrical energy.

[0033] In a specific implementation process, the light-emitting component 1 is first connected in series between the battery cell A and the analog front end B (ActiveFront End, AFE). The traditional balancing method is to generate heat through resistors to achieve energy dissipation. Therefore, the energy is converted into light energy for balancing through the light-emitting component 1. On the one hand, it can reduce the circuit temperature increase caused by heat generation, and on the other hand, it can also recycle the light energy. As for the method of recycling light energy, the photoelectric conversion component 2 is selected to effectively recycle the light energy generated by the light-emitting component 1. By converting light energy into electrical energy, it can also be used after a certain amount of voltage of electrical energy is recovered. In the whole process, compared with the traditional method, the energy dissipation is reduced, and the influence of the heat generated by the resistor on the circuit is avoided, and the balancing efficiency is guaranteed.

[0034] Furthermore, at least one group of light-emitting components 1 is provided, and the light-emitting components 1 include: a light-emitting diode 12 and a balancing resistor 11; the light-emitting diode 12 and the balancing resistor 11 are connected in series between the battery cell A and the analog front end B; the light-emitting diode 12 is used to convert the balancing energy of the battery cell A into light energy, and the balancing resistor 11 is used to protect the light-emitting diode 12.

[0035] Specifically, the light emitting assembly 1 uses a light emitting diode 12, which can ensure the efficiency and brightness of the light emission, and is also convenient for layout and design in the circuit, and each light emitting diode 12 is connected in series with a balancing resistor 11 to protect the light emitting diode 12. At the same time, the resistance of the balancing resistor 11 is very small, so that the heat generated by the balancing resistor 11 is also very small, and it will not cause the circuit temperature to rise abnormally. In addition, the light emitting diode 12 has a long service life, which can also ensure the durability of the balancing device.

[0036] The balancing resistor in this embodiment may be a variable resistor, and different resistance values ​​may be selected according to different battery cell sizes to ensure that excessive heat is not generated to affect the working state of the circuit.

[0037] When there are multiple groups of light emitting components 1, the multiple groups of light emitting components 1 are connected in parallel. By setting multiple groups of light emitting components 1 in parallel, the current flowing through each light emitting diode 12 can be effectively increased, thereby effectively improving the brightness of the light emitting diode 12, completing the energy balance more quickly, and effectively converting the balanced energy into light energy. At the same time, the photoelectric conversion component 2 can also better realize the absorption and conversion of light energy.

[0038] Further, based on the above embodiment, the light energy conversion component in this embodiment includes: photovoltaic; photovoltaic is connected in parallel to both ends of the battery cell A, and photovoltaic is used to convert light energy into electrical energy. Photovoltaic includes solar cell panel 21; solar cell panel 21 is connected in parallel to both ends of the battery cell A, and the solar cell package is used to convert light energy into electrical energy.

[0039] Specifically, the solar panel 21 is a device that converts light energy into electrical energy. Its core component is a solar cell composed of multiple silicon wafers. It mainly absorbs photons through semiconductor materials, generates electrons and holes, and forms current, which is then collected and used for power generation or charging. Therefore, the solar panel 21 can also absorb the light generated by the light-emitting diode 12 to achieve the conversion of light energy into electrical energy.

[0040] The angle of the solar panel 21 can be selected to match the angle of the light emitting diode 12 to ensure that the solar panel 21 can more efficiently absorb and utilize the light energy of the light emitting diode 12, while also improving the efficiency of photoelectric conversion.

[0041] After experimental demonstration and physical testing, the size of the solar panel 21 in this embodiment can be adapted according to the voltage sampling channel of the analog front end (for example, 3.5cm*1.5cm) to ensure that the light emitting diodes corresponding to the AFE sampling channel are fully covered. The solar panel 21 of this specification can ensure the effective completion of the conversion of light energy, and at the same time will not cause waste of the solar panel 21.

[0042] Further, based on the above embodiment, the photovoltaic in this embodiment also includes an energy storage component; the energy storage component is connected to the solar panel 21 and the battery cell A; the energy storage component is used to store the electric energy converted by the solar panel 21. When the storage voltage of the energy storage component is greater than the voltage of the battery cell A, the energy storage component is used to charge the low-power battery cell A.

[0043] Specifically, by providing an energy storage component, the electric energy converted by the solar panel 21 can be effectively recycled, and it is ensured that the low-power battery cell A will be charged only when the voltage is sufficient, and the damage to the battery cell A can also be reduced.

[0044] Furthermore, the present embodiment further comprises a diode 3 ; the diode 3 is connected in series between the solar cell panel 21 and the battery cell A, and the diode 3 is used to prevent the current of the solar cell panel 21 from flowing back.

[0045] By arranging a diode 3 between the solar cell panel 21 and the battery cell A, the unidirectional conduction characteristic of the diode 3 is utilized to avoid reverse flow, thereby protecting the solar cell panel 21 and avoiding the waste of electricity in the battery cell A.

[0046] Based on the same general utility model concept, the present utility model also protects a battery management system, including an equalizing device of a battery management system as described in any of the above embodiments.

[0047] Based on the same general utility model concept, the present utility model also protects an energy storage device, including the battery management system of the above embodiment.

[0048] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0049] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A balancing device for a battery management system, characterized in that: include: Light-emitting components and photoelectric conversion components; One end of the light-emitting component is connected to the battery cell, the other end of the light-emitting component is connected to the analog front end, and the photoelectric conversion component is connected in parallel to both ends of the battery cell; The light emitting component is used to convert the balanced energy of the battery core into light energy, and the photoelectric conversion component is used to convert the light energy into electrical energy.

2. The equalization device of the battery management system according to claim 1, characterized in that: The light emitting components are provided with at least one group, and the light emitting components include: a light emitting diode and a balancing resistor; The light emitting diode and the balancing resistor are connected in series between the battery cell and the analog front end; The light emitting diode is used to convert the balancing energy of the battery cell into light energy, and the balancing resistor is used to protect the light emitting diode.

3. The equalization device of the battery management system according to claim 2, characterized in that: When the light emitting components are provided in multiple groups, the multiple groups of light emitting components are connected in parallel.

4. The equalization device for a battery management system according to claim 1, characterized in that: The light energy conversion component includes: photovoltaic; The photovoltaic is connected in parallel to both ends of the battery core, and the photovoltaic is used to convert the light energy into electrical energy.

5. The equalization device of the battery management system according to claim 4, characterized in that: The photovoltaic includes solar panels; The solar cell panels are connected in parallel to the two ends of the battery core, and the solar cell pack is used to convert the light energy into electrical energy.

6. The equalization device of the battery management system according to claim 5, characterized in that: The photovoltaic also includes an energy storage component; The energy storage component is connected to the solar panel and the battery cell; The energy storage component is used to store the electric energy converted by the solar cell panel.

7. The equalization device of the battery management system according to claim 6, characterized in that: When the storage voltage of the energy storage component is greater than the voltage of the battery cell, the energy storage component is used to charge the low-power battery cell.

8. The equalization device of the battery management system according to claim 5, characterized in that: Also includes diodes; The diode is connected in series between the solar cell panel and the battery cell, and is used to prevent the current of the solar cell panel from flowing back.

9. A battery management system, characterized in that: An equalizing device for a battery management system comprising the device described in any one of claims 1 to 8.

10. An energy storage device, characterized in that: Comprising the battery management system as claimed in claim 9.

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