Integrated module for current sampling and circuit protection

Abstract

The utility model discloses an integrated module for current sampling and circuit protection. A DC / DC module, a fuse, a terminal B +, a pre-charging switch, a terminal B-, a diverter, a terminal P-, a pre-charging resistor and a terminal P + are all mounted on a mounting plate; the DC / DC module is mounted on the top side of the mounting plate, the fuse is mounted on the left side of the DC / DC module, the pre-charging switch and the pre-charging resistor are mounted on the left side of the fuse, and the shunt is mounted on the left side of the pre-charging switch. According to the utility model, all the components are arranged on the mounting plate in a centralized manner, so that the occupied space is reduced, the electromagnetic interference of the wiring harness is reduced, and the wiring among the components is simpler and more reasonable; a pre-charging control circuit is designed to protect a battery and a circuit, the service life of the battery is prolonged, the charging efficiency is improved, and safe operation of the system is ensured; the diverter is connected in series between the terminal B-and the terminal P-, so that current detection and sampling are directly realized.

Description

Technical Field

[0001] The utility model relates to the technical field of battery systems, and in particular to an integrated module for current sampling and circuit protection. Background Art

[0002] In order to respond to the national energy conservation, environmental protection and new energy development strategy, the proportion of lithium batteries in household energy storage applications has gradually increased, and lithium batteries replacing traditional lead batteries has become an industry development trend.

[0003] At present, when lithium battery systems are connected to the outside for charging and discharging, the circuit must have a pre-charge circuit to ensure that the instantaneous large current generated by the external load capacitive circuit is suppressed at the moment of battery connection, reducing the impact on the switch. In order to protect the circuit, a fuse is usually used to cut off the electrical connection between the battery system and the outside when the external load is short-circuited to avoid safety accidents. When the battery system is working, a low-voltage power supply must be used as the working power supply, and voltage conversion is usually achieved through DC / DC.

[0004] In summary, a large number of components are dispersedly arranged in the battery energy control system, which has problems such as large size, large space occupation, difficult assembly process, and complex wiring. If the wiring is unreasonable, electromagnetic interference is likely to occur, affecting the stability of the battery system operation. Utility Model Content

[0005] The utility model aims to solve the problems of large size, large space occupation, difficult assembly process and complicated wiring of the current battery energy control system. An integrated module for current sampling and circuit protection is designed, which integrates the current sampling circuit, protection circuit and low-voltage power supply together, simplifies the production and assembly process, improves the reliability of battery products and the convenience of maintenance.

[0006] An integrated module for current sampling and circuit protection, wherein a DC / DC module, a fuse, a terminal B+, a pre-charge switch, a terminal B-, a shunt, a terminal P-, a pre-charge resistor, and a terminal P+ are all mounted on a mounting plate; the DC / DC module is mounted on the top side of the mounting plate, the fuse is mounted on the left side of the DC / DC module, the pre-charge switch and the pre-charge resistor are mounted on the left side of the fuse, and the shunt is mounted on the left side of the pre-charge switch.

[0007] Preferably, the pre-charge switch and the pre-charge resistor are connected in series to form a pre-charge control circuit.

[0008] Preferably, the pre-charge control circuit is connected in series with the fuse.

[0009] Preferably, the shunt is connected in series between the terminal B- and the terminal P-.

[0010] Preferably, the DC / DC module is connected to a terminal B+ and a terminal B-, the terminal B+ is simultaneously connected to the positive electrode of the battery, and the terminal B- is simultaneously connected to the negative electrode of the battery.

[0011] Compared with the closest existing technology, the technical solution provided by this utility model has the following beneficial effects:

[0012] 1. The utility model centrally arranges the DC / DC module, shunt, pre-charge switch, pre-charge resistor and fuse on the mounting plate instead of dispersing them in the battery energy management system, which reduces the space occupied, reduces the electromagnetic interference of the wiring harness, and makes the wiring between components simpler and more reasonable.

[0013] 2. The utility model prevents the formation of large current and high voltage at the moment of high voltage power-on by designing a pre-charge control circuit, which may cause impact on the high voltage components in the system, thereby avoiding device damage, protecting batteries and circuits, extending battery life, improving charging efficiency, and ensuring safe operation of the system.

[0014] 3. The utility model directly realizes current detection and sampling by connecting a shunt in series between terminal B- and terminal P-. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the utility model;

[0016] Figure 2 This is the electrical schematic diagram of the utility model.

[0017] In the figure: 1. DC / DC module 2. Fuse 3. Terminal B+ 4. Pre-charge switch 5. Terminal B- 6. Shunt 7. Terminal P- 8. Pre-charge resistor 9. Terminal P+ 10. Install PCB board. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the practical embodiment to clearly and completely describe the technical solution in the practical embodiment. Obviously, the described embodiment is only a part of the embodiment of the practical embodiment, not all of the embodiments. Based on the embodiment in the practical embodiment, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this practical embodiment.

[0019] See also Figure 1The utility model provides a technical solution: an integrated module for current sampling and circuit protection, including a mounting plate 10, a DC / DC module 1, a fuse 2, a terminal B+ 3, a pre-charge switch 4, a terminal B- 5, a shunt 6, a terminal P-7, a pre-charge resistor 8, and a terminal P+9 are all mounted on the mounting plate 10; the DC / DC module 1 is mounted on the top side of the mounting plate 10, the fuse 2 is mounted on the left side of the DC / DC module 1, the pre-charge switch 4 and the pre-charge resistor 8 are mounted on the left side of the fuse 2, and the shunt 6 is mounted on the left side of the pre-charge switch 4. This module centrally arranges the DC / DC module 1, the shunt 6, the pre-charge switch 4, the pre-charge resistor 8, and the fuse 2 on the mounting plate 10 instead of arranging them in a dispersed manner in the battery energy management system, thereby reducing the space occupied and making the wiring between components simpler and more reasonable.

[0020] Further, the pre-charge switch 4 and the pre-charge resistor 8 are connected in series to form a pre-charge control circuit. The pre-charge switch 4 and the pre-charge resistor 8 are connected in parallel with the relay. The external device interface circuit usually consists of a large capacitor. If the relay is closed directly, a large current will be generated instantly, causing the relay to stick. This integrated module first closes the pre-charge switch 4, and the battery is first connected to the outside through the pre-charge resistor 8. The resistor suppresses the current. When the voltage on both sides of the capacitor of the external device interface circuit is balanced with the battery voltage, the relay is closed again, and there will be no instantaneous large current, realizing the soft start of the circuit.

[0021] Furthermore, the pre-charge control circuit is connected in series with the fuse 2. When the power is initially turned on, the pre-charge switch 4 is closed, the pre-charge control circuit is turned on, and the system is powered on for self-test. After the self-test passes, the pre-charge switch 4 is disconnected, and the pre-charge control circuit is disconnected; when the battery is short-circuited, the fuse 2 is disconnected to protect the battery. This design allows the battery interface to be "disconnected, connected, and discharged", extending the battery life, improving the charging efficiency, and ensuring the safe operation of the system.

[0022] Furthermore, the shunt 6 is connected in series between the terminal B-5 and the terminal P-7 to directly detect and sample the current, which is finally output through the integrated module.

[0023] Furthermore, the DC / DC module 1 is connected to the terminal B+3 and the terminal B-5, the terminal B+3 is connected to the positive pole of the battery input, and the terminal B-5 is connected to the negative pole of the battery input. After being connected, the DC / DC module is powered, and the DC / DC module outputs a low-voltage 12V / 24V power supply after internal voltage reduction to power the low-voltage circuit.

[0024] The working principle of the utility model is as follows: pre-charging after power is turned on. This integrated module closes the pre-charging switch 4. The battery first connects to the outside through the pre-charging resistor 5 and starts to supply power to the external device. The system self-checks and confirms that the voltage on both sides of the capacitor of the external device interface circuit is balanced with the battery voltage. Then, the relay in the main circuit is closed. The system self-checks again to confirm that the power supply of the external circuit is normal. The pre-charging switch 4 is disconnected, the pre-charging control circuit is disconnected, and soft start is achieved. The battery system starts to output a stable voltage. If the external circuit is overloaded, the shunt 7 detects an overload current, and the relay in the main circuit is disconnected to disconnect the battery connection. If the external circuit is short-circuited, the fuse 2 is blown, and the battery and the external circuit are disconnected to achieve protection for the entire system.

[0025] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field can still modify or replace the specific implementation methods of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention that are pending approval.

Claims

1. An integrated module for current sampling and circuit protection, comprising a mounting plate (10), characterized in that: The DC / DC module (1), the fuse (2), the terminal B+ (3), the pre-charging switch (4), the terminal B- (5), the shunt (6), the terminal P- (7), the pre-charging resistor (8), and the terminal P+ (9) are all mounted on a mounting plate (10); the DC / DC module (1) is mounted on the top side of the mounting plate (10), the fuse (2) is mounted on the left side of the DC / DC module (1), the pre-charging switch (4) and the pre-charging resistor (8) are mounted on the left side of the fuse (2), and the shunt (6) is mounted on the left side of the pre-charging switch (4).

2. An integrated module for current sampling and circuit protection according to claim 1, characterized in that: The pre-charging switch (4) and the pre-charging resistor (5) are connected in series to form a pre-charging control circuit, and the pre-charging switch (4) and the pre-charging resistor (5) are connected in parallel with the relay.

3. An integrated module for current sampling and circuit protection according to claim 2, characterized in that: The pre-charge control circuit is connected in series with the fuse (2).

4. The integrated module for current sampling and circuit protection according to claim 1, characterized in that: The shunt (6) is connected in series between terminal B- (5) and terminal P- (7).

5. The integrated module for current sampling and circuit protection according to claim 1, characterized in that: The DC / DC module (1) is connected to a terminal B+ (3) and a terminal B- (5), wherein the terminal B+ (3) is simultaneously connected to the positive electrode of the battery, and the terminal B- (5) is simultaneously connected to the negative electrode of the battery.

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