A solution for identifying generator power in truck lithium battery systems

Abstract

The present invention discloses a generator power identification scheme for a truck lithium battery system, step one: the battery is connected to an external charger for charging, the battery reaches a full charge level or is about to reach a full charge level, step two: when the internal voltage of the battery reaches 27.5V, it is detected that the charging current is greater than 80A and lasts for 5 minutes, it is considered that the generator power is very large, and the cumulative number of times the power is very large is increased by one. The present invention has strong applicability, and the generator voltage and power are detected by the battery itself, and the full charge voltage threshold and the low current voltage threshold are intelligently adjusted, and no manual adjustment by the user is required, and the maintenance cost is low. Through reasonable battery charging management and BMS protection strategy, the service life of the battery is extended, the maintenance cost of the battery is reduced, and the safety is high. Through reasonable battery charging management and BMS protection strategy, the occurrence of battery overcharging behavior can be effectively avoided, the safety of the battery is improved, and the safety factor of the truck driver during driving is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of truck lithium batteries, and in particular to a power identification solution for a truck lithium battery system generator. Background Art

[0002] With the rapid development of automobiles, truck lithium battery systems are increasingly used in the field of transportation. However, the traditional truck lithium battery system generator power identification method has low accuracy and lacks effective measures to solve the problem of the battery not being fully charged or entering a load dumping state due to the generator power being too high or too low, and the battery being fully charged into a low current. It cannot meet the requirements of modern transportation in terms of safety, environmental protection, and efficiency.

[0003] Some truck lithium batteries on the market use multi-level power distribution technology. This technology can intelligently distribute the output power of the battery to better meet the driver's demand for vehicle power and performance. At the same time, multi-level power distribution technology can also improve the service life and safety of the battery and reduce the maintenance cost of the vehicle.

[0004] This technology has relatively high limitations because the power regulation of the generator is limited. When the generator power is too large, it will enter a small current. At this time, the current is relatively large, above 50A, which will cause the battery to enter a load dump state; when the generator power is too small, when the internal voltage of the battery reaches 28V, the current is only a few A, or even no output current. At this time, it cannot enter a small current, which ultimately leads to the phenomenon of incomplete charging. Therefore, it cannot meet the rigid charging requirements of different working conditions or scenarios. If this technology needs to play its due role, more precise adjustment and control are required. However, due to the different environments of different truck drivers, and this adjustment requires manual adjustment, this increases the workload and psychological burden of drivers and company administrators. At present, truck lithium batteries have certain defects and limitations in handling generators of different powers. In order to better meet the charging needs under different working conditions and environments, this patent has developed a set of system methods for handling different generator powers with small limitations and strong applicability. Summary of the invention

[0005] The purpose of the present invention is to provide a solution for identifying the power of a generator of a truck lithium battery system, which solves the problems raised in the background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: a generator power identification solution for a truck lithium battery system, including high generator power and low generator power, wherein the generator power is high and includes the following method steps:

[0007] Step 1: Connect the battery to an external charger and charge it until the battery reaches full charge or is almost fully charged.

[0008] Step 2: When the internal voltage of the battery reaches 27.5V, it is detected that the charging current is greater than 80A and lasts for 5 minutes. It is considered that the generator power is very large, and the cumulative number of times the power is very large is increased by one;

[0009] Step 3: When this phenomenon is exited (i.e., the total voltage is less than 27V and the discharge current is greater than 5A for 5 minutes) and the generator power is very high next time, the cumulative number of times the generator power is very high is increased by one;

[0010] Step 4: When the number of times the generator power is very high reaches 5, raise the thresholds of the full charge cut-off voltage (default 3.65V) and the low current voltage (default 3550mv) by 50mv;

[0011] Step 5: After raising the threshold, the BMS system will maintain this threshold for one week and re-test after one week.

[0012] As a preferred embodiment of the present invention, when the generator power is low, the following steps are included:

[0013] Step 1: Connect the battery to an external charger and charge it until the battery reaches full charge or is almost fully charged.

[0014] Step 2: When the internal voltage of the battery reaches 27.5V, a charging current of less than 2A or a discharging current is detected for 5 minutes. At this time, the generator power is considered to be very low, and the cumulative number of times the power is very low is increased by one;

[0015] Step 3: When this phenomenon is exited (i.e. the total voltage is less than 27V and the discharge current is greater than 5A for 5 minutes) and the generator power is very low next time, the cumulative number of times the generator power is very low is increased by one;

[0016] Step 4: When the number of times the generator power is very low reaches 5, reduce the thresholds of the full charge cut-off voltage (default 3.65V) and the low current voltage (default 3550mv) by 50mv;

[0017] Step 5: After lowering the threshold, the BMS system will maintain this threshold for one week, and then re-test after one week.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention has strong applicability, and can intelligently adjust the full charge voltage threshold and the low current voltage threshold by detecting the generator voltage and power inside the battery itself, without the need for manual adjustment by the user;

[0020] Low maintenance cost: through reasonable battery charging management and BMS protection strategy, the battery life is extended and the battery maintenance cost is reduced;

[0021] High safety. Through reasonable battery charging management and BMS protection strategy, the occurrence of battery overcharging can be effectively avoided, the safety of the battery can be improved, and the safety factor of the truck driver can be improved during driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 The present invention is a flow chart of a power identification scheme for a truck lithium battery system generator. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] Example

[0026] A generator power identification scheme for a truck lithium battery system includes a high generator power and a low generator power. When the generator power is high, the method steps are as follows:

[0027] Step 1: Connect the battery to an external charger and charge it until the battery reaches full charge or is almost fully charged.

[0028] Step 2: When the internal voltage of the battery reaches 27.5V, it is detected that the charging current is greater than 80A and lasts for 5 minutes. It is considered that the generator power is very large, and the cumulative number of times the power is very large is increased by one;

[0029] Step 3: When this phenomenon is exited (i.e., the total voltage is less than 27V and the discharge current is greater than 5A for 5 minutes) and the generator power is very high next time, the cumulative number of times the generator power is very high is increased by one;

[0030] Step 4: When the number of times the generator power is very high reaches 5, raise the thresholds of the full charge cut-off voltage (default 3.65V) and the low current voltage (default 3550mv) by 50mv;

[0031] Step 5: After raising the threshold, the BMS system will maintain this threshold for one week and re-test after one week.

[0032] In addition, when the generator power is low, the following steps are included:

[0033] Step 1: Connect the battery to an external charger and charge it until the battery reaches full charge or is almost fully charged.

[0034] Step 2: When the internal voltage of the battery reaches 27.5V, a charging current of less than 2A or a discharging current is detected for 5 minutes. At this time, the generator power is considered to be very low, and the cumulative number of times the power is very low is increased by one;

[0035] Step 3: When this phenomenon is exited (i.e. the total voltage is less than 27V and the discharge current is greater than 5A for 5 minutes) and the generator power is very low next time, the cumulative number of times the generator power is very low is increased by one;

[0036] Step 4: When the number of times the generator power is very low reaches 5, reduce the thresholds of the full charge cut-off voltage (default 3.65V) and the low current voltage (default 3550mv) by 50mv;

[0037] Step 5: After lowering the threshold, the BMS system will maintain this threshold for one week, and then re-test after one week.

[0038] In summary, the present invention has strong applicability, and can intelligently adjust the full charge voltage threshold and the low current voltage threshold by detecting the generator voltage and power inside the battery itself, without the need for manual adjustment by the user;

[0039] Low maintenance cost: through reasonable battery charging management and BMS protection strategy, the battery life is extended and the battery maintenance cost is reduced;

[0040] High safety. Through reasonable battery charging management and BMS protection strategy, the occurrence of battery overcharging can be effectively avoided, the safety of the battery can be improved, and the safety factor of the truck driver can be improved during driving.

[0041] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A power identification solution for truck lithium battery system generator, characterized by: The method includes high generator power and low generator power, wherein the method includes the following steps when the generator power is high: Step 1: Connect the battery to an external charger and charge it until the battery reaches full charge or is almost fully charged. Step 2: When the internal voltage of the battery reaches 27.5V, it is detected that the charging current is greater than 80A and lasts for 5 minutes. It is considered that the generator power is very large, and the cumulative number of times the power is very large is increased by one; Step 3: When the total voltage is less than 27V and the discharge current is greater than 5A for 5 minutes, and the generator power is very high next time, the cumulative number of times the generator power is very high is increased by one; Step 4: When the number of times the generator power is very high reaches 5, the thresholds of the full charge cut-off voltage and the low current voltage are raised by 50mv; Step 5: After raising the threshold, the BMS system will maintain this threshold for one week and re-test after one week.

2. A power identification scheme for a truck lithium battery system generator according to claim 1, characterized in that: When the generator power is low, the following steps are included: Step 1: Connect the battery to an external charger and charge it until the battery reaches full charge or is almost fully charged. Step 2: When the internal voltage of the battery reaches 27.5V, a charging current of less than 2A or a discharging current is detected for 5 minutes. At this time, the generator power is considered to be very low, and the cumulative number of times the power is very low is increased by one; Step 3: When the total voltage is less than 27V and the discharge current is greater than 5A for 5 minutes, and the generator power is very low next time, the cumulative number of times the generator power is very low is increased by one; Step 4: When the number of times the generator power is very low reaches 5, the thresholds of the full charge cut-off voltage and the low current voltage are both reduced by 50mv; Step 5: After lowering the threshold, the BMS system will maintain this threshold for one week, and then re-test after one week.

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