Current limiting device for charging low-voltage storage battery

Abstract

The utility model discloses a current-limiting device for charging a low-voltage storage battery, which belongs to the technical field of charging current-limiting devices and comprises a 24V-72V power battery for providing electric power support for a whole vehicle, the 24V-72V power battery is electrically connected with a high-power DC-DC (direct current-direct current), the high-power DC-DC is electrically connected with a low-voltage load, the 24V-72V power battery and the high-power DC-DC are both connected with the current-limiting device, and the current-limiting device is electrically connected with the low-voltage load. The high-power DC-DC and the low-voltage load are both connected with the current limiting device, the current limiting device is connected with the low-voltage battery, and the low-voltage battery is connected with the battery detection module. Through the mode, the low-voltage battery can charge all low-voltage loads, so that undervoltage or surge cannot be generated in a circuit; the charging DC-DC is only used for charging a low-voltage battery and is a constant-current and constant-voltage charging DC, and the service life of the battery can be prolonged by limiting the charging current; according to the utility model, high-precision measurement of current, voltage and temperature of the low-voltage battery can be realized through the battery detection module.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging current -limiting device technical field, concretely relates to a current -limiting device for charging low -voltage battery. BACKGROUND

[0002] In the field of automobiles and robots, low-voltage batteries serve as important energy storage units, and the stability and safety of their charging process are of great importance. Low-voltage battery charging current-limiting technology has emerged to control the size of the charging current, prevent battery overheating, overcharging, and other problems, thereby ensuring the safety of the battery and extending its service life.

[0003] For example, Chinese patent CN206306846U discloses a dual-DC power supply system for low-speed electric vehicles, which includes a power storage battery, a first DC module and a second DC module connected to the power storage battery, a first power distribution circuit connected to the first DC module, and a second power distribution circuit connected in parallel to the second DC module. Compared with the prior art, the utility model adopts two DC modules connected to the power storage battery, and the two DC modules are connected to the first power distribution circuit and the second power distribution circuit, respectively.

[0004] However, the technology has the following problems: the first DC module and the second DC module have no power distinction, and overcharging of the low-voltage battery on the second DC module does not have a current-limiting effect; the low-voltage battery cannot supply power to electrical equipment of low-voltage loads, which is defective because the low-voltage load has a steering gear, a brake, and other equipment, and the first DC module may not supply enough power during use, requiring the low-voltage battery to discharge as a capacitor.

[0005] Based on this, the utility model designs a current-limiting device for charging low-voltage batteries to solve the above problems. UTILITY MODEL CONTENTS

[0006] In view of the above shortcomings of the prior art, the utility model provides a current-limiting device for charging low-voltage batteries.

[0007] To achieve the above purpose, the utility model realizes the following technical solutions:

[0008] A current-limiting device for charging low-voltage batteries, including a 24V-72V power battery for providing power support to the whole vehicle, the 24V-72V power battery is electrically connected with a high-power DC-DC, the high-power DC-DC is electrically connected with a low-voltage load, the 24V-72V power battery and the high-power DC-DC are connected with the current-limiting device, the high-power DC-DC and the low-voltage load are connected with the current-limiting device, and the current-limiting device is connected with a low-voltage battery.

[0009] The current limiting device comprises a charging DC-DC and a diode, the charging DC-DC is connected with the diode; the input end of the charging DC-DC is connected with a 24V-72V power battery and a high-power DC-DC; the output end of the charging DC-DC is connected with a low-voltage battery; the output end of the charging DC-DC is connected with the high-power DC-DC and a low-voltage load through the diode.

[0010] The low-voltage battery is connected with a battery detection module for detecting the health state of the low-voltage battery.

[0011] Further, the charging DC-DC is a small-power charging DC-DC.

[0012] Further, the diode is a high-power anti-backflow diode.

[0013] Further, the positive pole of the output voltage of the 24V-72V power battery is connected with the positive pole of the input voltage of the high-power DC-DC; the negative pole of the output voltage of the 24V-72V power battery is connected with the negative pole of the input voltage of the high-power DC-DC; the positive pole and the negative pole of the output voltage of the high-power DC-DC are connected with two ends of the low-voltage load.

[0014] Further, the positive pole of the output voltage of the 24V-72V power battery and the positive pole of the input voltage of the high-power DC-DC are connected with the positive pole of the input voltage of the charging DC-DC; the negative pole of the output voltage of the 24V-72V power battery and the negative pole of the input voltage of the high-power DC-DC are connected with the negative pole of the input voltage of the charging DC-DC.

[0015] Further, the negative pole of the output voltage of the charging DC-DC is connected with the negative pole of the low-voltage battery; the positive pole of the output voltage of the charging DC-DC is connected with the positive pole of the low-voltage battery; the positive pole of the output voltage of the charging DC-DC and the positive pole of the low-voltage battery are grounded.

[0016] Further, the positive pole of the output voltage of the charging DC-DC and the positive pole of the low-voltage battery are connected with one end of the diode; the other end of the diode is connected with the positive pole of the output voltage of the high-power DC-DC and one end of the low-voltage load; the negative pole of the output voltage of the high-power DC-DC and the other end of the low-voltage load are grounded.

[0017] Further, the battery detection module comprises a voltage sensor, a current sensor, a temperature sensor, a digital-to-analog converter and a microcontroller, input ends of the voltage sensor, the current sensor and the temperature sensor are electrically connected with the low-voltage battery, for collecting voltage, current and temperature information of the low-voltage battery, output ends of the voltage sensor, the current sensor and the temperature sensor are electrically connected with input ends of the digital-to-analog converter, and an output end of the digital-to-analog converter is electrically connected with an input end of the microcontroller.

[0018] Further, the battery detection module further comprises a first decoder, a second decoder and a third decoder, an output end of the microcontroller is electrically connected with input ends of the first decoder, the second decoder and the third decoder, an output end of the first decoder is electrically connected with an input end of the voltage sensor, an output end of the second decoder is electrically connected with an input end of the current sensor, and an output end of the third decoder is electrically connected with an input end of the temperature sensor.

[0019] Compared with the prior art, the utility model has the advantages that 1, charging DC-DC is only used for charging the low-voltage battery, and is constant-current constant-voltage type charging DC, and limiting the charging current can prolong the service life of the battery,

[0020] 2, the low-voltage battery can still charge all low-voltage loads, so that under-voltage or surge will not be generated in the circuit,

[0021] 3, compared with other means, the price is very low, and in the safety aspect, compared with not increasing the current limiting device or adopting other current limiting modes, the safety and stability of the current limiting device are very high, the charging DC-DC and the diode contained in the current limiting device are all vehicle-grade electrical devices, therefore, whether the original vehicle is refitted or a new design vehicle model, the operation is very simple,

[0022] 4, the utility model can realize high-precision measurement of the current, voltage and temperature of the low-voltage battery through the battery detection module, has the advantages of high precision, automation and flexible convenience, and guarantees the normal operation of the whole circuit through real-time monitoring of the state of the low-voltage battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0024] Figure 1 It is a connecting frame of the current limiting device for charging low-voltage storage battery of the utility model Figure 1 ;

[0025] Figure 2 A connecting frame of the current limiting device for charging low-voltage storage battery Figure 2 ;

[0026] Figure 3 A connection diagram of the battery detection module.

[0027] The reference numerals in the drawings represent respectively:

[0028] 1, 24V~72V power battery; 2, high-power DC-DC; 3, current limiting device; 31, charging DC-DC; 32, diode; 4, low-voltage load; 5, low-voltage battery; 6, battery detection module; 61, voltage sensor; 62, current sensor; 63, temperature sensor; 64, digital-to-analog converter; 65, microcontroller; 66, first decoder; 67, second decoder; 68, third decoder. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] In some embodiments, referring to the drawings of the specification Figures 1-3 A current limiting device for charging low-voltage storage battery, comprising 24V~72V power battery 1 for providing power support for the whole vehicle, the 24V~72V power battery 1 is electrically connected with high-power DC-DC 2, the high-power DC-DC 2 is electrically connected with low-voltage load 4, the 24V~72V power battery 1 and the high-power DC-DC 2 are connected with current limiting device 3, the high-power DC-DC 2 and the low-voltage load 4 are connected with current limiting device 3, and the current limiting device 3 is connected with low-voltage battery 5.

[0031] The current limiting device 3 comprises charging DC-DC 31 and diode 32, the charging DC-DC 31 is connected with diode 32, the input end of the charging DC-DC 31 is electrically connected with the 24V~72V power battery 1 and the high-power DC-DC 2, the output end of the charging DC-DC 31 is electrically connected with the low-voltage battery 5, and the output end of the charging DC-DC 31 is electrically connected with the high-power DC-DC 2 and the low-voltage load 4 through diode 32.

[0032] The low-voltage battery 5 is connected with a battery detection module 6 for detecting the health state of the low-voltage battery 5.

[0033] The charging DC-DC 31 is a low-power charging DC-DC device, and the model is WG-72C1220M.

[0034] The diode 32 is a large-power anti-reverse diode, and the model is MD100-16.

[0035] In use, a charging DC-DC 31 is connected in parallel between the low-voltage battery 5 and the large-power DC-DC 2, the output current of the charging DC-DC 31 is 20A at most, the output voltage is 13.8V for a lead-acid battery or 14.6V for a lithium iron phosphate battery, and the charging mode is constant current and constant voltage, so that the service life of the battery can be greatly prolonged.

[0036] A diode 32 is connected in series between the low-voltage battery 5 and the low-voltage load 4, the forward continuous current of the diode 32 is 100A, the peak surge current is 920A, and the maximum reverse voltage is 1600V, so that the large-power DC-DC 2 and the charging DC-DC 31 can be safely and effectively isolated, the low-voltage battery 5 and the low-voltage load 4 can work independently, and the low-voltage battery 5 can safely and stably supply power to the low-voltage load 4.

[0037] The charging DC-DC 31 is only used for charging the low-voltage battery 5, and is a constant current and constant voltage type charging DC, so that the service life of the battery can be prolonged by limiting the charging current.

[0038] The low-voltage battery 5 can still charge all the low-voltage loads 4, so that under-voltage or surge will not occur in the circuit.

[0039] The positive pole of the output voltage of the 24V-72V power battery 1 is electrically connected with the positive pole of the input voltage of the large-power DC-DC 2, the negative pole of the output voltage of the 24V-72V power battery 1 is electrically connected with the negative pole of the input voltage of the large-power DC-DC 2, and the positive pole and the negative pole of the output voltage of the large-power DC-DC 2 are electrically connected with the two ends of the low-voltage load 4.

[0040] The positive pole of the output voltage of the 24V-72V power battery 1 and the positive pole of the input voltage of the large-power DC-DC 2 are electrically connected with the positive pole of the input voltage of the charging DC-DC 31, and the negative pole of the output voltage of the 24V-72V power battery 1 and the negative pole of the input voltage of the large-power DC-DC 2 are electrically connected with the negative pole of the input voltage of the charging DC-DC 31.

[0041] The negative pole of the charging DC-DC 31 output voltage is electrically connected to the negative pole of the low-voltage battery 5, and the positive pole of the charging DC-DC 31 output voltage is electrically connected to the positive pole of the low-voltage battery 5, both of which are grounded.

[0042] The positive pole of the charging DC-DC 31 output voltage and the positive pole of the low-voltage battery 5 are both electrically connected to one end of the diode 32, the other end of the diode 32 is electrically connected to the positive pole of the high-power DC-DC 2 output voltage and one end of the low-voltage load 4, and the negative pole of the high-power DC-DC 2 output voltage is grounded.

[0043] As shown in Figure 3 The battery detection module 6 includes a voltage sensor 61, a current sensor 62, a temperature sensor 63, a digital-to-analog converter 64, and a microcontroller 65, the input ends of the voltage sensor 61, the current sensor 62, and the temperature sensor 63 are electrically connected to the low-voltage battery 5 for collecting voltage, current, and temperature information of the low-voltage battery 5, the output ends of the voltage sensor 61, the current sensor 62, and the temperature sensor 63 are electrically connected to the input end of the digital-to-analog converter 64, and the output end of the digital-to-analog converter 64 is electrically connected to the input end of the microcontroller 65.

[0044] The battery detection module 6 further includes a first decoder 66, a second decoder 67, and a third decoder 68, the output end of the microcontroller 65 is electrically connected to the input ends of the first decoder 66, the second decoder 67, and the third decoder 68, the output end of the first decoder 66 is electrically connected to the input end of the voltage sensor 61, the output end of the second decoder 67 is electrically connected to the input end of the current sensor 62, and the output end of the third decoder 68 is electrically connected to the input end of the temperature sensor 63.

[0045] The digital-to-analog converter 64 converts the digital signals of voltage, current, and temperature collected by the voltage sensor 61, the current sensor 62, and the temperature sensor 63 into analog signals, which are then input into the microcontroller 65 for identification. If the microcontroller 65 detects that one or more of the voltage, current, and temperature data is abnormal, the microcontroller 65 will cut off the entire circuit and notify personnel for maintenance.

[0046] The first decoder 66, the second decoder 67, and the third decoder 68 receive instruction information for battery detection in the microcontroller 65 and convert the instruction information into data information that can be recognized by the voltage sensor 61, the current sensor 62, and the temperature sensor 63, thereby realizing the function of real-time detection of the low-voltage battery 5.

[0047] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A current limiting device for charging a low voltage battery, comprising a 24V-72V power battery (1) for providing power support to the whole vehicle, characterized in that: The 24V-72V power battery (1) is electrically connected with the high-power DC-DC (2), the high-power DC-DC (2) is electrically connected with the low-voltage load (4), the 24V-72V power battery (1) and the high-power DC-DC (2) are connected with the current limiting device (3), the high-power DC-DC (2) and the low-voltage load (4) are connected with the current limiting device (3), and the current limiting device (3) is connected with the low-voltage battery (5). The current limiting device (3) comprises a charging DC-DC (31) and a diode (32), the charging DC-DC (31) is electrically connected with the diode (32), the charging DC-DC (31) is connected with the diode (32), the input end of the charging DC-DC (31) is electrically connected with the 24V-72V power battery (1) and the high-power DC-DC (2), the output end of the charging DC-DC (31) is electrically connected with the low-voltage battery (5), and the output end of the charging DC-DC (31) is electrically connected with the high-power DC-DC (2) and the low-voltage load (4) through the diode (32). The low-voltage battery (5) is connected with the battery detection module (6) for detecting the health state of the low-voltage battery (5).

2. A current limiting device for charging a low voltage battery according to claim 1, characterized in that The charging DC-DC (31) adopts a small-power charging DC-DC.

3. A current limiting device for charging a low voltage battery according to claim 2, characterised in that, The diode (32) adopts a high-power anti-backflow diode.

4. A current limiting device for charging a low voltage battery according to claim 3, characterised in that, The positive pole of the output voltage of the 24V-72V power battery (1) is electrically connected with the positive pole of the input voltage of the high-power DC-DC (2), the negative pole of the output voltage of the 24V-72V power battery (1) is electrically connected with the negative pole of the input voltage of the high-power DC-DC (2), and the positive pole and the negative pole of the output voltage of the high-power DC-DC (2) are electrically connected with the two ends of the low-voltage load (4).

5. A current limiting device for charging a low voltage battery according to claim 4, characterised in that, The positive pole of the output voltage of the 24V-72V power battery (1) and the positive pole of the input voltage of the high-power DC-DC (2) are electrically connected with the positive pole of the input voltage of the charging DC-DC (31), and the negative pole of the output voltage of the 24V-72V power battery (1) and the negative pole of the input voltage of the high-power DC-DC (2) are electrically connected with the negative pole of the input voltage of the charging DC-DC (31).

6. A current limiting device for charging a low voltage battery according to claim 5, characterised in that, The negative pole of the output voltage of the charging DC-DC (31) is electrically connected with the negative pole of the low-voltage battery (5), the positive pole of the output voltage of the charging DC-DC (31) is electrically connected with the positive pole of the low-voltage battery (5), and the positive pole of the output voltage of the charging DC-DC (31) and the positive pole of the low-voltage battery (5) are grounded.

7. A current limiting device for charging a low voltage battery according to claim 6, characterised in that, The positive pole of the output voltage of the charging DC-DC (31) and the positive pole of the low-voltage battery (5) are electrically connected with one end of the diode (32), the other end of the diode (32) is electrically connected with the positive pole of the output voltage of the high-power DC-DC (2) and one end of the low-voltage load (4), and the negative pole of the output voltage of the high-power DC-DC (2) and the other end of the low-voltage load (4) are grounded.

8. A current limiting device for charging a low voltage battery according to claim 7, characterised in that, The battery detection module (6) comprises a voltage sensor (61), a current sensor (62), a temperature sensor (63), a digital-to-analog converter (64) and a microcontroller (65), the input ends of the voltage sensor (61), the current sensor (62) and the temperature sensor (63) are electrically connected with the low-voltage battery (5), the output ends of the voltage sensor (61), the current sensor (62) and the temperature sensor (63) are electrically connected with the input end of the digital-to-analog converter (64), and the output end of the digital-to-analog converter (64) is electrically connected with the input end of the microcontroller (65).

9. A current limiting device for charging a low voltage battery according to claim 8, characterised in that, The battery detection module (6) further comprises a first decoder (66), a second decoder (67) and a third decoder (68), the output end of the microcontroller (65) is electrically connected with the input ends of the first decoder (66), the second decoder (67) and the third decoder (68), the output end of the first decoder (66) is electrically connected with the input end of the voltage sensor (61), the output end of the second decoder (67) is electrically connected with the input end of the current sensor (62), and the output end of the third decoder (68) is electrically connected with the input end of the temperature sensor (63).

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