Resistance type lithium battery connecting device
By using a high-resistivity metal material in the lithium battery connection device to increase the internal resistance of the lithium battery, the problem of parking lithium battery starting failure is solved, improving the reliability of vehicle starting and the comfort and safety of the driver.
Patent Information
- Application Number
- CN202520071185.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-13
AI Technical Summary
The high voltage and low internal resistance of the parking lithium battery cause the starter motor to mistakenly identify a successful start before fuel injection, interrupting the starter motor circuit and causing a starting failure. The probability of multiple starting failures is high, affecting the reliability of vehicle starting.
A resistive lithium battery connection device is adopted, which increases the internal resistance of the lithium battery pack by using connecting pieces and connecting wires made of metal materials with high resistivity, thereby reducing the voltage and current during startup and avoiding ECU misjudgment.
It effectively avoids ECU misjudgment, improves the reliability and success rate of car starting, and enhances driver comfort and safety.
Smart Images
Figure CN223843118U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of parking lithium battery technology, and in particular to a voltage-reducing and current-limiting resistive lithium battery connection device. Background Technology
[0002] The lead-acid batteries that come standard with large trucks have a rated voltage of 24V and a capacity of less than 150Ah, with an internal resistance of more than 7mR. In order to use the car's air conditioning for a long time when parked, they are usually replaced with parking lithium batteries of 230Ah or more, with an internal resistance of about 2.5mR, which is only about one-third of that of lead-acid batteries.
[0003] For diesel engines in large trucks meeting China V emission standards or higher, the starter motor first drives the engine to a certain speed or after a certain delay before fuel is injected to start the engine. After a successful start, the engine speed signal transmitted from the crankshaft position sensor is sent to the ECU to determine whether the engine has started successfully. Once a successful start is determined, the ECU will control the starter motor circuit to stop operating. When the parking lithium battery is fully charged, the output voltage is around 28V. Because the parking lithium battery has a higher voltage and lower internal resistance, it drives the starter motor and engine to run at high speed. Before fuel injection begins, the ECU may mistakenly determine that the start is successful and interrupt the starter motor circuit, causing a starting failure. To avoid this situation, the optimal solution is to increase the internal resistance of the parking lithium battery. Voltage reduction and current limiting are sometimes used. Lead-acid batteries have an output voltage of around 28V when fully charged, and occasional starting failures may occur. However, the probability of successful restart is high because the voltage of a lead-acid battery drops to around the rated voltage of 24V after starting the motor once. However, parking lithium batteries may not be able to start successfully after multiple starts because the voltage of the lithium battery is still above 26V after multiple starts. Sometimes, it may take a certain amount of time to discharge with the lights on before it can start successfully. However, there are differences among similar vehicles. Some vehicles can start smoothly, or even vehicles using lower-quality lithium batteries can start smoothly, but this will affect the warranty and operational reliability. This further proves that the mismatch between parking lithium batteries and vehicles is only near the critical point and can be compensated for through technical means. Utility Model Content
[0004] To overcome the above-mentioned technical problems, this utility model provides a resistive lithium battery connection device, which provides a voltage-reducing and current-limiting resistive lithium battery connection device to avoid the ECU misjudging the start as successful before fuel injection begins, interrupting the starter motor circuit and causing start failure.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A resistive lithium battery connection device includes a lithium battery pack, a protection board, a battery box, a resistive connection piece and a resistive connection wire, a low-resistance connection piece, a positive terminal and a negative terminal. The lithium battery pack is installed inside the battery box, and the protection board is installed on one side of the lithium battery pack. The battery box has a positive terminal and a negative terminal. The positive terminal is electrically connected to the low-resistance connection piece mounted on the positive terminal of the lithium battery pack using a resistive connection wire. The negative terminal is electrically connected to the P- terminal of the protection board using a resistive connection wire. Adjacent cells in the lithium battery pack are electrically connected by resistive connection pieces. The negative terminal of the lithium battery pack is electrically connected to the B- terminal on the protection board using a low-resistance connection piece.
[0007] Furthermore, the thickness of the resistive connecting piece is 1 to 1.5 mm, and there is a positioning hole symmetrically opened at both ends of the resistive connecting piece. The acquisition line and temperature sensor fixing nut are installed in the center of the resistive connecting piece. A U-shaped through groove with opposite openings is opened on the resistive connecting piece between the positioning hole and the acquisition line and temperature sensor fixing nut.
[0008] Furthermore, the width of the resistive connecting piece on the outside of the U-shaped through groove is 2.5 to 3.5 mm, the distance between the two U-shaped through grooves is 2.5 to 3.5 mm, the width of the U-shaped through groove is 0.8 to 1.2 mm, and the U-shaped through groove has a concave arc part on one side of the positioning hole. Current passes through the two sides of the resistive connecting piece with a width of 2.5 to 3.5 mm, and the relatively narrow sides can form a certain DC resistance.
[0009] Furthermore, the connecting wires with resistance are made of a metal material with higher resistivity, such as iron wire. Using a connecting material made of a metal material with higher resistivity increases the internal resistance of the lithium battery pack, and it is cheaper to change from copper wire to iron wire.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0011] This solution addresses the negative impacts of the strong starting capability of parking lithium batteries on car drivers, and lays the foundation for the widespread application of parking lithium batteries in large trucks, improving the comfort, convenience, and safety of truck drivers during driving. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the front sectional view of the present invention.
[0013] Figure 2 This is a top sectional view of the present invention.
[0014] Figure 3 This is a schematic diagram of the left sectional view of the present invention.
[0015] Figure 4 This is a three-dimensional structural diagram of the battery box of this utility model.
[0016] Figure 5 This is a schematic diagram of the main structure of the resistor connector.
[0017] Figure 6 This is a top view of the structure of the resistor connector. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0019] This invention provides a resistive lithium battery connection device, which is a voltage-reducing and current-limiting resistive lithium battery connection device, to prevent the ECU from mistakenly judging the start as successful before fuel injection begins, interrupting the starter motor circuit and causing start failure.
[0020] Specifically, a resistive lithium battery connection device includes a lithium battery pack 1, a protection board 2, a battery box 3, a resistive connection piece 4 and a resistive connection wire 5, a low-resistance connection piece 6, a positive terminal 31 and a negative terminal 32. The lithium battery pack 1 is installed inside the battery box 3, and the protection board 2 is installed on one side of the lithium battery pack 1. The battery box 3 is provided with a positive terminal 31 and a negative terminal 32. The positive terminal 31 is electrically connected to the low-resistance connection piece 6 installed on the positive terminal of the lithium battery pack 1 by the resistive connection wire 5. The negative terminal 32 is electrically connected to the P- terminal 21 of the protection board 2 by the resistive connection wire 5. Adjacent cells in the lithium battery pack 1 are electrically connected by the resistive connection piece 4. The negative terminal of the lithium battery pack 1 is electrically connected to the B- terminal 22 on the protection board 2 by the low-resistance connection piece 6.
[0021] The thickness of the resistive connecting piece 4 is 1 to 1.5 mm. A positioning hole 41 is symmetrically opened at both ends of the resistive connecting piece 4. The acquisition line and temperature sensor fixing nut 42 are installed in the center of the resistive connecting piece 4. A U-shaped through groove 43 with opposite openings is opened on the resistive connecting piece 4 between the positioning hole 41 and the acquisition line and temperature sensor fixing nut 42.
[0022] The width of the resistive connecting piece 4 on the outer side of the U-shaped through groove 43 is 2.5 to 3.5 mm. The distance between the two U-shaped through grooves 43 is 2.5 to 3.5 mm. The width of the U-shaped through groove 43 is 0.8 to 1.2 mm. The U-shaped through groove 43 has a concave arc portion 44 on one side of the positioning hole 41. Current passes through both sides of the 2.5 to 3.5 mm wide resistive connecting piece 4. The relatively narrow sides can form a certain DC resistance.
[0023] The resistive connecting wire 5 is made of a metal material with higher resistivity, such as iron wire. Using a connecting material made of a metal material with higher resistivity increases the internal resistance of the lithium battery pack, and it is cheaper to change from copper wire to iron wire.
[0024] Experiments show that when the parking lithium battery is fully charged and the engine is started, the increased internal resistance consumes about 1V of voltage, which reduces the starter motor current by about 5% and the speed by about 5%. At this time, the starter motor operating current is about 500A. Only by adding about 2mR of DC resistance inside the parking lithium battery can this problem be solved. Since the voltage reduction generates heat, with a power of about 500*500*2 / 1000=500W, it needs to be distributed. It is reasonable to distribute about 1mR between the seven lithium battery resistor connection pieces and the lithium battery pack, protection board, and output terminal resistor connection lines. Apart from starting, the car's operating current is below 100A. Adding 2mR of internal resistance only increases heat loss by 100*100*2 / 1000=20W, which has little impact on the parking lithium battery weighing over 100 catties. The voltage drop is only 100*2 / 1000=0.2V, which has a negligible impact on the charging and discharging of the parking lithium battery and the operation of the car's electrical system.
[0025] The added DC resistance of about 2mR can be distributed entirely on the lithium battery resistive connector or entirely on the resistive connector line.
[0026] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and concept of this utility model, should be included within the scope of protection of this utility model.
Claims
1. A resistive lithium battery connection device, comprising a lithium battery pack (1), a protection board (2), a battery box (3), a resistive connection piece (4), a resistive connection wire (5), a low-resistance connection piece (6), a positive terminal (31), and a negative terminal (32), characterized in that: The lithium battery pack (1) is installed inside the battery box (3). The protection board (2) is installed on one side of the lithium battery pack (1). The battery box (3) is provided with a positive terminal (31) and a negative terminal (32). The positive terminal (31) is electrically connected to the low-resistance connecting piece (6) mounted on the positive terminal of the lithium battery pack (1) by a resistance connecting wire (5). The negative terminal (32) is electrically connected to the P- terminal (21) of the protection board (2) by a resistance connecting wire (5). Adjacent cells in the lithium battery pack (1) are electrically connected by a resistance connecting piece (4). The negative terminal of the lithium battery pack (1) is electrically connected to the B- terminal (22) on the protection board (2) by a low-resistance connecting piece (6).
2. The resistive lithium battery connection device according to claim 1, characterized in that: The thickness of the resistive connecting piece (4) is 1 to 1.5 mm. A positioning hole (41) is symmetrically opened at both ends of the resistive connecting piece (4). The acquisition line and temperature sensor fixing nut (42) are installed in the center of the resistive connecting piece (4). A U-shaped through groove (43) with opposite openings is opened on the resistive connecting piece (4) between the positioning hole (41) and the acquisition line and temperature sensor fixing nut (42).
3. The resistive lithium battery connection device according to claim 2, characterized in that: The width of the connecting piece (4) with resistance on the outside of the U-shaped through groove (43) is 2.5 to 3.5 mm, the distance between the two U-shaped through grooves (43) is 2.5 to 3.5 mm, the width of the U-shaped through groove (43) is 0.8 to 1.2 mm, and the U-shaped through groove (43) is provided with a concave arc part (44) on one side of the positioning hole (41).
4. The resistive lithium battery connection device according to claim 1, characterized in that: The aforementioned resistive connecting wire (5) is made of a metal material with high resistivity.