CN104638687B - Car emergency startup power supply - Google Patents

Abstract

The invention provides an emergency starting power supply for automobiles, which includes a battery pack module; a stabilized power supply; a load terminal; a first-level circuit breaker protection module; a second-level circuit breaker protection module; a detection device for detecting the voltage of the load terminal, for Detecting the voltage of the first-level circuit breaker protection module, used to detect the voltage of the second-level circuit breaker protection module, and used to convert the detected result into an electrical signal; the control device is used to control the regulated power supply to output high voltage or low voltage The voltage is used to receive the electrical signal sent by the detection device, and is used to control the first-level open circuit protection module or the second-level short-circuit protection module according to the received electrical signal; The power supply outputs a high voltage, and the second-level circuit breaker protection module and the first-level circuit breaker protection module are turned on sequentially; when the voltage at the load terminal is higher than the voltage of the battery pack module, the control device turns off the first-level circuit breaker protection module and the second-level circuit breaker protection module sequentially. Circuit breaker protection module.

Description

car emergency starter

technical field

The invention relates to a starting power supply, in particular to an automobile emergency starting power supply.

Background technique

The car emergency starter is used to start the car under extreme conditions, such as low temperature starting. Provide high current in a short time to start the car. Under extreme conditions, the instantaneous locked-rotor current can reach more than 1000A, which is a typical short-time high-current discharge situation.

Most of the automotive jump-starter products on the market are made of lead-acid batteries for many years. Lead-acid batteries may cause serious environmental pollution in the process of manufacture, use, and recycling; and the emergency starting power supply is a non-useful device used in a low-temperature environment, and the idle time is long. The lead in lead-acid batteries is prone to oxidation, causing the battery to malfunction. In the prior art, there is an emergency starter power supply for automobiles made of a large-rate lithium iron phosphate battery, but the price of the large-rate lithium iron phosphate battery is too high, and the market acceptance is low.

The price of high-rate ternary lithium batteries is not much different from that of lead-acid batteries, and the cost is within the range that is easily accepted by the market. But do not adopt ternary lithium battery to make emergency start-up power supply in the prior art, this is because the rated voltage of electric appliance in existing standard is 12V, must not be greater than 14.4V, otherwise easily cause electric appliance to burn, must not be less than 7.2V, otherwise An effective power supply cannot be formed. The voltage of a single high-rate ternary lithium battery is 4.2V after being fully charged, and the charging voltage of a four-series ternary lithium battery pack must reach 4.2V×4=16.8V, which is too high. After the 12V car is started, the generator will charge the battery, and the charging voltage can reach 14.4V. The charging voltage of the three-string ternary lithium battery pack must be less than or equal to 4.2V×3=12.6V. After the 12V car is started, the 14.4V charging voltage of the generator can reverse the overvoltage charge for the three-string ternary lithium battery pack, causing The battery overheats and even burns.

Therefore, the discharge circuit must be highly reliable to ensure that after the car is started, when the car generator generates a charging voltage of 14.4V, the car generator is disconnected from the three-string ternary lithium battery pack in time to avoid charging the three-string ternary lithium battery pack. Reverse overvoltage charging.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention discloses an automobile emergency starter power supply, which can solve one or more of the above-mentioned problems.

The invention discloses an emergency starting power supply for automobiles, which includes a battery pack module, which includes at least two three-series ternary lithium battery packs connected in parallel; a stabilized power supply, which can output high voltage and low voltage; and a load terminal, which It is used to receive the voltage of the battery pack module or the regulated power supply and output it to the outside; the first-level circuit breaker protection module is used to switch the emergency start power supply of the car; the second-level circuit breaker protection module is used for Switching on and off the emergency starting power supply of the automobile; the detection device is used to detect the voltage of the load terminal, which is used to detect the voltage of the first-level circuit breaker protection module, and which is used to detect the voltage of the second-level circuit breaker protection module, It is used to convert the detected result into an electrical signal; the control device is used to control the stabilized power supply to output high voltage or low voltage, which is used to receive the electrical signal sent by the detection device, which is used to According to the received electrical signal, the first-level circuit breaker protection module or the second-level short-circuit protection module is controlled; when the automobile emergency starter power supply starts, the control device drives the regulated power supply to output a high voltage, so The second-level circuit breaker protection module and the first-level circuit breaker protection module are sequentially connected; when the voltage at the load terminal is higher than the voltage of the battery pack module, the control device sequentially turns off the first-level circuit breaker protection module and the second-stage circuit breaker protection module.

Preferably, the second-level circuit breaker protection module includes a relay and a thermistor module connected in series, the relay is controlled by the control device, and the thermistor module includes one or more thermistors connected in parallel .

Preferably, the second circuit breaker protection module, the circuit breaker protection module includes a triode connected in series and a protection module, the triode is controlled by the control device, and the protection module includes a plurality of thermistors connected in parallel with the thermistor Resistors are field effect transistors connected in series one by one.

Preferably, the thermistor is a PTC thermistor.

Preferably, the secondary circuit breaker protection module is connected to the positive pole or the negative pole of the battery pack.

Preferably, the high voltage output by the regulated power supply is 11V, and the low voltage output by the regulated power supply is 7V.

Preferably, when the automobile emergency start power supply is in a normal working state, the stabilized power supply outputs a low voltage, and the first-stage circuit breaker protection module and the second stage circuit breaker protection module.

Preferably, the first-stage circuit breaker protection module is a relay.

Preferably, the detection device includes a first detection unit and a second detection unit, the first detection unit is used to detect the load terminal, and the second detection unit is used to detect the second level of open circuit protection The module performs detection, and the first detection unit and the second detection unit are used to detect the first-level circuit breaker protection module.

Preferably, the detection device includes a first detection unit and a second detection unit, the first detection unit is used to detect the second-level circuit breaker protection module, and the second detection unit is used to detect the first The primary circuit breaker protection module performs detection, and the first detection unit and the second detection unit are used to detect the load terminal.

Implementing the technical solution of the present invention can solve the technical problem that the ternary lithium battery cannot be used to make an emergency starting power supply for automobiles in the prior art; implementing the technical solution of the present invention can prevent reverse charging of the ternary lithium battery, overcurrent discharge and battery overheating, to ensure the safety of the system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a structural schematic diagram of the first embodiment of the emergency starting power supply for automobiles in the present invention.

Fig. 2 is a structural schematic diagram of the second embodiment of the automobile emergency starting power supply in the present invention.

In the drawings: 1. Battery pack module; 11. Three-string ternary lithium battery pack; 2. Stabilized power supply; 3. Load terminal; 41. First detection unit; 42. Second detection unit; 5. First stage Open circuit protection module; 6. Second level open circuit protection module; 61. Thermistor; 62. Relay; 63. Field effect tube; 64. Transistor; 7. Control device.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The invention discloses an automobile emergency starting power supply, which includes a battery pack module 1, a stabilized power supply 2, a load terminal 3, a detection device, a first-stage circuit break protection module 5, a second stage circuit break protection module 6 and a control device 7.

Specifically, the battery pack module 1 includes at least two groups of three-string ternary lithium battery packs 11 juxtaposed with each other. In this embodiment, the battery pack module 1 includes two sets of three-string ternary lithium battery packs 11 . The regulated power supply 2 can output high voltage and low voltage. In this embodiment, the high voltage output by the regulated power supply 2 can be 11V, and the low voltage output by the regulated power supply 2 can be 7V. The load terminal 3 can receive the voltage of the battery pack module 1 or the regulated power supply 2 and output it externally. The detection device is used to detect the voltage of the load terminal 3 , which is used to detect the voltage of the first-level circuit breaker protection module 5 , and which is used to detect the voltage of the second-level circuit breaker protection module 6 . The detection device converts the detected results into electrical signals. The control device 7 is electrically connected with the detection device. The control device 7 can receive the electrical signal sent by the detection device. In this embodiment, the detection device includes a first detection unit 41 and a second detection unit 42, the first detection unit 41 is used to detect the load terminal 3, and the second detection unit 42 is used to detect the second The secondary circuit breaker protection module 6 performs detection, and the first detection unit 41 and the second detection unit 42 are used to detect the first stage circuit breaker protection module 5 . The control device 7 can control the first level open circuit protection module 5 or the second level short circuit protection module according to the received electrical signal sent by the detection device. The first-level disconnection protection module 5 and the second-level disconnection protection module 6 can be arranged on the positive pole or the negative pole of the battery pack module 1 . In this embodiment, both the first-stage circuit breaker protection module 5 and the second stage circuit breaker protection module 6 are connected to the positive pole of the battery pack module 1 . The first level circuit breaker protection module 5 may be a relay. The first-level circuit breaker protection module 5 can shut down the emergency starting power supply of the automobile. The second-stage circuit breaker protection module 6 may include a relay 62 and a thermistor 61 connected in series. The thermistor 61 module includes a plurality of thermistors 61 parallel to each other. The second-stage circuit breaker protection module 6 can shut down the emergency starting power supply of the automobile. The control device 7 is electrically connected with the regulated power supply 2 . The control device 7 can control the regulated power supply 2 to output high voltage or low voltage to the outside. The control device 7 is electrically connected with the detection device. The control device 7 receives the electric signal sent by the detection device, and controls according to the electric signal. The control device 7 is electrically connected with the first-level circuit breaker protection module 5 . The control device 7 can control the on-off of the first-level circuit breaker protection module 5 . The control device 7 is electrically connected to the second-stage circuit breaker protection module 6 . The control device 7 can control the on-off of the second-stage circuit breaker protection module 6 . In this embodiment, the load terminal 3 may be connected to a storage battery, a motor, and the like.

When the emergency starting power supply of the vehicle is activated, the control device 7 drives the stabilized power supply 2 to output a high voltage, and the second-stage circuit breaker protection module 6 and the first stage circuit breaker protection module 5 are sequentially connected.

When the voltage of the load terminal 3 is higher than the voltage of the battery pack module 1 , the control device 7 turns off the first-level disconnection protection module 5 and the second-level disconnection protection module 6 in sequence.

When the automobile emergency start power supply is in a normal working state, the regulated power supply 2 outputs a low voltage, and the first-stage circuit breaker protection module 5 and the second stage circuit breaker protection module 6 .

The working principle of the automobile emergency starting power supply in the present invention is as follows: when starting, the control device 7 controls the regulated power supply 2 to output a high voltage so that it triggers the second-level circuit breaker protection module 6, and the control device 7 controls the second-level circuit breaker protection module. 6 is controlled so that it is turned on in an uncharged state, and the control device 7 controls the first-level disconnection protection module 5 so that it is turned on in a charged state. When the automobile emergency start power supply is in normal operation, the control device 7 maintains the connection of the first-level disconnection protection module 5 and the second-level disconnection protection module 6, and reduces the output voltage of the stabilized power supply 2 so that it remains at a low voltage. When the vehicle emergency start power supply detects that the voltage of the load terminal 3 is higher than the voltage of the battery pack module 1, the control module controls the first-level disconnection protection module 5 so that it is disconnected in a charged state, and then the control module controls the second The stage disconnection protection module 6 is controlled so that it is disconnected in a non-energized state.

To sum up, after the car is started, the car alternator may generate 14.4V charging voltage. At this time, the automobile emergency starter power supply in the present invention can disconnect the automobile generator from the battery pack module 1 to avoid reverse overvoltage charging of the battery pack module 1 . At the same time, during the start-up and disconnection process, the second-level circuit breaker protection module 6 always works under the condition of no power. When the first level of circuit breaker protection module 5 breaks down, the second level of circuit breaker protection module 6 just has a charged operation, but, after this charged operation, the emergency start power supply of the car is also scrapped and cannot be used again. Reverse overvoltage charging may occur due to failure of the first-level circuit breaker protection module 5 or the second circuit breaker protection module. Thereby, the work of adopting the automobile emergency starting power supply of the present invention is safe and reliable.

In a preferred embodiment, the second-level power-off protection module includes a triode 64 connected in series and a protection module, the triode 64 is controlled by the control device 7, and the protection module includes a plurality of thermistors 61 and Field effect transistors 63 connected in series with thermistors 61 one by one. When the first stage power failure protection module fails, the field effect transistor 63 is disconnected and no longer works. In this embodiment, the first-level disconnection protection module 5 is connected to the positive pole of the battery pack module 1 , and the second-level disconnection protection module 6 is connected to the negative pole of the battery pack module 1 . The detection device includes a first detection unit 41 and a second detection unit 42, the first detection unit 41 is used to detect the second-stage circuit breaker protection module 6, and the second detection unit 42 is used for the first The first detection unit 41 and the second detection unit 42 are used to detect the load terminal 3 .

In a preferred embodiment, the thermistor 61 may be a PTC thermistor 61 . PTC is the abbreviation of PositiveTemperature Coefficient, which means a positive temperature coefficient, and generally refers to semiconductor materials or components with a large positive temperature coefficient. The PTC thermistor 61 is a typical temperature-sensitive semiconductor resistor. When the temperature exceeds a certain temperature (Curie temperature), its resistance value increases stepwise as the temperature increases.

It should be pointed out that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be Included within the protection scope of the present invention.

Claims (9)

1. A car emergency starting power supply, characterized in that: it includes A battery pack module comprising at least two three-string ternary lithium battery packs connected in parallel; A regulated power supply, the regulated power supply is connected in parallel with the battery pack module, and is used to output high voltage or low voltage; A load terminal, the load terminal is respectively connected to the battery pack module and the regulated power supply, and is used to receive and output the voltage of the battery pack module or the regulated power supply; A first-level circuit breaker protection module, the first-level circuit breaker protection module is connected in series with the load terminal, and is used to switch the emergency start power supply of the vehicle; A second-level circuit breaker protection module, the second-level circuit breaker protection module is connected in series with the load terminal, and is used to switch the emergency start power supply of the vehicle; The detection device is used to detect the voltage of the load terminal, which is used to detect the voltage of the first-level circuit breaker protection module, which is used to detect the voltage of the second-level circuit breaker protection module, and which is used to convert the detected result into an electric current Signal; A control device, the control device is respectively connected with the voltage-stabilized power supply and the detection device, and is used to control the voltage-stabilized power supply to output high voltage or low voltage to the outside, and it is used to receive the power sent by the detection device A signal, which is used to control the first-level circuit breaker protection module or the second-level circuit breaker protection module according to the received electrical signal; When the emergency starting power supply of the automobile is activated, the control device drives the stabilized power supply to output a high voltage, and the second-level circuit breaker protection module and the first-level circuit breaker protection module are sequentially connected; When the voltage at the load terminal is higher than the voltage of the battery pack module, the control device turns off the first-level circuit breaker protection module and the second-level circuit breaker protection module in sequence. 2. The automobile emergency starting power supply according to claim 1, characterized in that: the second-level circuit breaker protection module includes a relay and a thermistor module connected in series, the relay is controlled by the control device, the A thermistor module consists of one or more thermistors connected in parallel. 3. The automobile emergency starting power supply according to claim 1, characterized in that: the second stage circuit breaker protection module includes a triode and a protection module connected in series, the triode is controlled by the control device, and the protection module It includes multiple thermistors connected in parallel and field effect transistors connected in series with the thermistors one by one. 4. The automobile emergency starter power supply according to claim 2 or 3, characterized in that: the thermistor is a PTC thermistor. 5. The emergency starting power supply for automobiles according to claim 1, characterized in that: the second-level circuit breaker protection module is connected to the positive pole or the negative pole of the battery pack. 6. The automobile emergency starting power supply according to claim 1, characterized in that: the high voltage output by the regulated power supply is 11V, and the low voltage output by the regulated power supply is 7V. 7. The emergency starting power supply for automobiles according to claim 1, characterized in that: the first-stage circuit breaker protection module is a relay. 8. The automobile emergency starter power supply according to claim 1, characterized in that: the detection device comprises a first detection unit and a second detection unit, the first detection unit is used to detect the load end, the The second detection unit is used to detect the second-level circuit breaker protection module, and the first detection unit and the second detection unit are used to test the first-level circuit breaker protection module. 9. The automobile emergency starter power supply according to claim 1, characterized in that: the detection device includes a first detection unit and a second detection unit, and the first detection unit is used to detect the second level of the circuit breaker protection module To detect, the second detection unit is used to detect the first-level circuit breaker protection module, and the first detection unit and the second detection unit are used to detect the load terminal.