A voltage adaptation method for a parked lithium battery system

Abstract

The application discloses a voltage adapting method of a parking lithium battery system, comprising a battery cell group, a protection board, a selection switch, a vehicle-mounted electric appliance, a first branch circuit and a second branch circuit; the battery cell group, the protection board, the selection switch, the vehicle-mounted electric appliance, the first branch circuit and the second branch circuit constitute a parallel circuit, wherein the positive pole of the battery cell group is electrically connected with the input end of the first branch circuit, the input end of the second branch circuit and the input end of the protection board respectively, and the output end of the first branch circuit and the output end of the second branch circuit are electrically connected with the input end of the vehicle-mounted electric appliance; the protection board controls the selection switch to be communicated with the first branch circuit or the second branch circuit; the first branch circuit is a short-circuit loop, and the voltage adjusting assembly is arranged in the second branch circuit in series connection, so that the adaptability, utilization efficiency and endurance of the parking lithium battery system are improved.

Description

Technical Field

[0001] This invention belongs to the field of vehicle power supply technology, and particularly relates to a voltage adaptation method for a parking lithium battery system. Background Technology

[0002] With the rapid development of the logistics industry, long-distance transportation has become the norm. To protect the health of drivers and ensure they have a good rest environment, more and more commercial vehicles are being equipped with parking electrical equipment such as air conditioners. Providing a stable power supply to these devices while the vehicle is parked has become a critical requirement.

[0003] In the existing technology, there are two main solutions to meet the power supply needs of parked vehicles: one is to use a small generator that uses fossil fuels as fuel, but it is not only expensive to use, but also produces exhaust gas and noise that have a significant impact on the surrounding environment and drivers, making it less environmentally friendly and practical; the other is to use a battery for power supply, which has a relatively low cost of use, can be supplemented by a generator when the vehicle is in normal driving, has environmental advantages, and can also replace the original lead-acid battery to enable vehicle starting, so it has been widely used.

[0004] However, the original lead-acid battery in the vehicle has a rated voltage of 24V, with a voltage range of 19.2~27.6V, and a normal operating range of 24.5~26.5V; while the parking lithium battery system has a rated voltage of 25.6V, with a voltage range of 24~28.5V. There is a significant discrepancy between their voltage platforms and ranges. When the parking lithium battery system is fully charged, its voltage will be relatively high, at which point some models may experience starting problems or malfunctions of onboard electrical components.

[0005] To address the aforementioned voltage mismatch issue, existing technologies employ two main solutions: one is to lower the charging cutoff threshold of the parking lithium battery system, causing the lithium battery system to fail to fully charge, resulting in reduced usable power and decreased range; the other is to require the driver to temporarily turn on the headlights to discharge the lithium battery after it is fully charged. This method relies on manual operation, which is not only cumbersome but also unreliable and cannot fundamentally solve the problem.

[0006] Therefore, there is an urgent need to design a voltage adaptation method for parking lithium battery systems to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a voltage adaptation method for a parking lithium battery system, which solves the problem of the vehicle being difficult to start or the vehicle's electrical appliances being unusable due to the high voltage of the parking lithium battery system after it is fully charged, without changing the charging cutoff threshold of the parking lithium battery system. At the same time, it improves the adaptability, utilization efficiency and range of the parking lithium battery system.

[0008] To achieve the above objectives, the specific technical solution of the voltage adaptation method for a parking lithium battery system of the present invention is as follows: A voltage adaptation method for a parking lithium battery system includes: a battery cell assembly, a protection board, a selector switch, vehicle electrical components, a first branch circuit, and a second branch circuit. The battery cell assembly, the protection board, the selector switch, the vehicle electrical components, the first branch, and the second branch constitute a parallel circuit. The positive terminal of the battery cell assembly is electrically connected to the input terminal of the first branch, the input terminal of the second branch, and the input terminal of the protection board, respectively. The output terminals of the first branch and the second branch are electrically connected to the input terminal of the vehicle electrical components. The protection board controls the selection switch to connect the first branch or the second branch; The first branch is a short-circuit circuit, and a voltage regulating component is connected in series in the second branch.

[0009] Furthermore, the protection board collects the real-time voltage of the battery cell assembly. It also stores the vehicle's highest voltage value. ; when When this occurs, the selection switch connects to the first branch; when When this occurs, the selection switch connects to the second branch.

[0010] Furthermore, when When the selection switch connects the second branch, the voltage regulation component reduces the voltage of the... to equal to Then, power is supplied to the vehicle's electrical appliances through the second branch.

[0011] Furthermore, the battery cell assembly includes multiple battery cells, and the protection board is electrically connected to each of the battery cells. The protection board collects the real-time voltage of each battery cell in real time.

[0012] Furthermore, the protection board triggers the switching of the selector switch contacts via a voltage signal.

[0013] Furthermore, the selection switch is an electromagnetic switch or an electronic switching switch.

[0014] Furthermore, the voltage regulation component is a voltage regulator or a DC buck module.

[0015] Furthermore, the voltage adaptation method for the parking lithium battery system also includes a power generation device, the output terminal of which is electrically connected to the output terminals of the first branch and the second branch.

[0016] Furthermore, the connection node between the power generation device and the first branch is the same node as the connection node between the vehicle electrical appliance and the first branch.

[0017] Furthermore, the response time for switching between the first branch and the second branch is ≤10ms.

[0018] The voltage adaptation method for the parking lithium battery system of the present invention has the following advantages: 1. Improved Lithium Battery System Adaptability: This invention collects the cell pack voltage in real time through a protection board, intelligently analyzes the matching between the real-time voltage and the vehicle system voltage, and achieves precise voltage regulation by selectively conducting one of the two branches without changing the charging cutoff threshold of the parking lithium battery system or the system voltage itself. This ensures that the parking lithium battery system voltage is always kept within the rated voltage range of the vehicle system, adapting to the voltage requirements of different commercial vehicles and expanding the applicable vehicle model range of the parking lithium battery system.

[0019] 2. Improve the utilization efficiency and range of lithium battery systems: This invention adopts an intelligent voltage regulation mode, which does not require lowering the charging cutoff voltage threshold of the parking lithium battery system, nor does it require reducing the chip usage range of the parking lithium battery. It can fully charge the lithium battery system, give full play to its storage capacity advantage, effectively improve the utilization efficiency and range of the lithium battery system, and solve the pain point of reduced range caused by lowering the charging threshold in the existing technology.

[0020] 3. Convenient operation and high reliability: The entire voltage adaptation process is automatically controlled by the protection board. The switching between the first and second branches is achieved by triggering the selector switch through the voltage signal. No manual intervention is required, making operation convenient. The selector switch adopts an electromagnetic switch or an electronic switching switch. The switching response time between the first and second branches is ≤10ms, which can ensure the continuity of power supply to the vehicle's electrical appliances. At the same time, the protection board collects the individual voltage of each battery cell and the total system voltage in real time, which can detect battery cell abnormalities in a timely manner and improve the reliability of system operation.

[0021] 4. Simple structure and low cost: This invention can be achieved simply by adding a first branch, a second branch and a voltage regulation component, combined with the control functions of the existing protection board and selector switch. No complex hardware modification is required. The structure is simple, the manufacturing cost is low, and it is easy to mass-produce and promote in the market.

[0022] 5. Achieve coordinated adaptation between charging and power supply: The generator, the parking lithium battery system, and the vehicle's electrical appliances share the same parallel circuit. During charging, the protection board controls the selector switch to conduct the first branch without voltage regulation components, ensuring that the voltage of the generator is consistent with the voltage of the lithium battery system, allowing the lithium battery system to be fully charged. During power supply, the branch is automatically switched according to the voltage status, which not only ensures the charging effect but also achieves voltage adaptation. Attached Figure Description

[0023] Figure 1 This is a system schematic diagram of the voltage adaptation method for the parking lithium battery system of the present invention; Figure 2 This is the execution logic diagram of the voltage adaptation method for the parking lithium battery system of the present invention.

[0024] Explanation of markings in the diagram: 1. Battery cell assembly; 2. Protection board; 3. Selector switch; 4. Vehicle electrical components; 5. First branch circuit; 6. Second branch circuit; 61. Voltage regulation assembly; 7. Generator. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0027] The following is a reference to the appendix. Figure 1 To be continued Figure 2 This invention describes a voltage adaptation method for a parking lithium battery system.

[0028] like Figure 1 and Figure 2 As shown, a voltage adaptation method for a parking lithium battery system includes: a battery cell assembly 1, a protection board 2, a selector switch 3, vehicle electrical components 4, a first branch circuit 5, and a second branch circuit 6. The battery cell assembly 1, the protection board 2, the selector switch 3, the vehicle electrical appliance 4, the first branch 5, and the second branch 6 form a parallel circuit. The positive terminal of the battery cell assembly 1 is electrically connected to the input terminal of the first branch 5, the input terminal of the second branch 6, and the input terminal of the protection board 2, respectively. The output terminals of the first branch 5 and the second branch 6 are electrically connected to the input terminal of the vehicle electrical appliance 4. The protection board 2 controls the selection switch 3 to connect the first branch 5 or the second branch 6; The first branch 5 is a short-circuit circuit, and a voltage regulating component 61 is connected in series in the second branch 6.

[0029] Furthermore, the protection board 2 collects the real-time voltage of the battery cell assembly 1. It also stores the vehicle's highest voltage value. ; when When this occurs, the selection switch 3 connects to the first branch 5; when When this occurs, the selection switch 3 connects to the second branch 6.

[0030] Furthermore, when When the selector switch 3 connects to the second branch 6, the voltage regulating component 61 reduces the voltage of the selected branch 6. to equal to Then, power is supplied to the vehicle electrical appliance 4 through the second branch 6, and the voltage reduction value of the voltage regulation component 61 is the charging cutoff voltage threshold of the parking lithium battery system. The difference, i.e. .

[0031] Furthermore, the battery cell assembly 1 includes multiple battery cells connected in series to form the battery cell assembly 1. The protection board 2 is electrically connected to each of the battery cells. The protection board 2 collects the real-time voltage of each battery cell and the total system voltage of the battery cell assembly 1 in real time to accurately determine the voltage status of the parking lithium battery system.

[0032] Furthermore, the protection board 2 triggers the contact switching of the selection switch 3 through a voltage signal to achieve selective conduction of the first branch 5 and the second branch 6.

[0033] Furthermore, the selection switch 3 is an electromagnetic switch or an electronic switching switch to ensure the reliability and response speed of branch switching.

[0034] Furthermore, the voltage regulation component 61 is a voltage regulator or a DC step-down module, which can achieve precise voltage reduction according to the actual voltage difference requirement.

[0035] Furthermore, the voltage adaptation method of the parking lithium battery system also includes a power generation device 7, the output terminal of which is electrically connected to the output terminal of the first branch 5 and the output terminal of the second branch 6. The power generation device 7 is used to supplement the battery cell group 1 with power when the vehicle is in motion.

[0036] Furthermore, the connection node between the power generation device 7 and the first branch 5 is the same node as the connection node between the vehicle electrical appliance 4 and the first branch 5. That is, the connection circuit between the power generation device 7 and the parking lithium battery system, and the connection circuit between the vehicle electrical appliance 4 and the parking lithium battery system are the same parallel circuit, simplifying the circuit structure design.

[0037] Furthermore, the response time for switching between the first branch 5 and the second branch 6 is ≤10ms, ensuring the continuity of power supply to the vehicle electrical appliances 4 and avoiding power outages caused by branch switching that could affect equipment use.

[0038] Furthermore, the commercial vehicle includes long-distance transport vehicles such as trucks and vans; the vehicle electrical system 4 includes equipment requiring parking or starting power, such as a starter motor and parking air conditioner; the rated voltage of the battery pack 1 is 25.6V, with a voltage range of 24~28.5V; the rated voltage of the lead-acid battery originally matched to the commercial vehicle is 24V, with a voltage range of 19.2~27.6V. It is 27.6V.

[0039] Furthermore, the protection board 2 integrates a voltage threshold storage module for presetting and storing voltage thresholds. and These values ​​are provided to facilitate adjustments later based on the needs of different vehicle models.

[0040] The present invention will be further illustrated by specific embodiments below, but these embodiments do not limit the scope of protection of the present invention.

[0041] Example 1 In this embodiment, the voltage adapter of the parking lithium battery system includes a cell assembly 1, a protection board 2, a selector switch 3, vehicle electrical components 4, a first branch circuit 5, a second branch circuit 6, and a generator 7 (i.e., a vehicle generator). The components form a parallel circuit, and the specific connection relationship is as follows: The battery cell assembly 1 is composed of multiple battery cells connected in series. The rated voltage of the battery cell assembly 1 is 25.6V, and the voltage range is 24~28.5V. Its positive terminal is electrically connected to the input terminal of the first branch 5, the input terminal of the second branch 6, and the input terminal of the protection board 2, respectively. Its negative terminal is electrically connected to the output terminal of the vehicle electrical appliance 4 and the input terminal of the vehicle generator, providing power to the entire system.

[0042] Protection board 2 is electrically connected to each cell, and can collect the individual voltage of each cell and the total system voltage of cell group 1 (i.e., real-time voltage) in real time. Protection board 2 integrates a voltage threshold storage module, which pre-stores the vehicle's highest voltage value. (In this embodiment) =27.6V (corresponding to the maximum voltage of the original vehicle's 24V lead-acid battery) and the charging cutoff voltage threshold of the parking lithium battery system. Meanwhile, the protection board 2 is electrically connected to the selector switch 3, and the contact switching of the selector switch 3 can be triggered by the output voltage signal.

[0043] Selector switch 3 is an electromagnetic switch used to selectively close either the first branch 5 or the second branch 6 according to the control signal of the protection board 2, so as to avoid circuit conflict caused by the simultaneous conduction of the two branches.

[0044] The first branch 5 is a short-circuit circuit without voltage regulation components. Its input terminal is electrically connected to the positive terminal of the battery cell group 1, and its output terminal is electrically connected to the parallel node. The parallel node is also electrically connected to the input terminal of the vehicle electrical appliance 4 and the output terminal of the generator 7, ensuring lossless power transmission.

[0045] A voltage regulator 61 is connected in series in the second branch 6. The voltage regulator 61 is a DC step-down module, whose input terminal is electrically connected to the positive terminal of the battery cell group 1, and whose output terminal is electrically connected to the parallel node. The voltage reduction value of the voltage regulator 61 is preset to [value missing]. It can precisely reduce the overvoltage portion of cell pack 1 to [the required voltage]. .

[0046] The vehicle electrical appliances 4 include a starter motor and a parking air conditioner. Their power input terminals are electrically connected to the parallel node and can obtain a stable power supply through the first branch 5 or the second branch 6.

[0047] The output terminal of the vehicle generator is electrically connected to the parallel node. The connection node between the generator 7 and the first branch 5, and the connection node between the vehicle electrical appliance 4 and the first branch 5 are the same parallel node. That is, the generator 7, the vehicle electrical appliance 4, the first branch 5, the second branch 6, and the battery cell group 1 constitute the same parallel circuit.

[0048] The specific steps of the voltage adaptation method of the present invention are as follows: Protection board 2, through its electrical connection with cell group 1 and each cell, collects the total system voltage of cell group 1 in real time. And the individual cell voltage of each battery cell (the individual cell voltage is collected for cell status monitoring and does not affect the core voltage judgment logic); at the same time, the protection board 2 calls the pre-stored... Real-time collection and To compare, the subsequent actions are performed in two different scenarios: Scenario A: (The voltage of battery pack 1 is within the original vehicle's compatible voltage range); Scene B: (The voltage of battery cell 1 exceeds the original vehicle's compatible voltage range and needs to be reduced.) The protection board 2 outputs a voltage control signal to the selector switch 3 based on the voltage comparison result. After receiving the signal, the selector switch 3 performs contact switching to achieve selective conduction of the first branch 5 and the second branch 6. Scenario A ( ): Protection board 2 controls the selector switch 3 to close the first branch 5 and disconnect the second branch 6; at this time, the first branch 5 acts as a short circuit, and the voltage of the battery pack 1 can be directly transmitted to the vehicle electrical appliances 4.

[0049] Scene B ( ): Protection board 2 controls the selector switch 3 to close the second branch 6 and disconnect the first branch 5; at this time, the voltage regulation component 61 in the second branch 6 starts synchronously, ready to perform the voltage reduction action.

[0050] Power supply path for scenario A: Cell group 1 → First branch 5 → Parallel node → Vehicle electrical appliance 4 (starter motor / parking air conditioner); The voltage obtained by vehicle electrical appliance 4 is equal to (≤) It meets the original vehicle voltage requirements, enabling normal vehicle start-up or stable operation of the parking air conditioner.

[0051] Power supply path for scenario B: Cell group 1 → Second branch 6 → Voltage regulation component 61 (to...) Reduce pressure to → Parallel node → Vehicle electrical appliances 4 (starter motor / parking air conditioner); the voltage after step-down is precisely matched with the original vehicle's maximum allowable voltage to ensure that the vehicle starts without faults and that vehicle electrical appliances 4 work stably; at the same time, the branch switching response time is ≤10ms to avoid power outages affecting equipment use.

[0052] When the vehicle is in motion, the vehicle's generator starts and outputs electrical energy. The charging process is as follows: When the protection board 2 detects a change in the output voltage (or charging signal) of the generator 7, it automatically controls the selector switch 3 to either maintain or switch the first branch 5 closed. Charging path: Generator 7 → Parallel node → First branch 5 → Cell group 1; Since the first branch 5 is a short-circuit circuit with no voltage regulation component, the output voltage of generator 7 is consistent with the voltage of cell group 1, ensuring that the charging voltage reaches the specified level. (Charging cut-off threshold) enables the battery pack 1 to be fully charged without changing the original charging cut-off threshold setting.

[0053] Throughout the power supply process, protection board 2 continuously collects data in real time. Each voltage change triggers the aforementioned voltage judgment and branch switching process, ensuring that battery pack 1 is compatible with the original vehicle voltage across the entire voltage range from never fully charged to fully charged; when charging is complete, if Rise to > The system automatically switches from charging mode to the power supply mode of scenario B (second branch 6 step-down power supply); if the vehicle is turned off, the generator 7 stops working, and the system maintains the power supply state of the current branch until the voltage of the battery cell pack 1 drops to The system will then automatically switch back to power supply from the first branch, 5.

[0054] In this embodiment, the selector switch 3 can also be an electronic switching switch, and the voltage regulation component 61 can also be a voltage regulator, both of which can achieve the same technical effect; commercial vehicles include long-distance transport vehicles such as trucks and vans, and the vehicle electrical appliances 4 can also include other equipment that requires parking power supply, as long as their power input terminal is electrically connected to the parallel node, they can be adapted to the voltage regulation method of the present invention.

[0055] This invention, through reasonable circuit design and intelligent control logic, effectively solves the problem of voltage mismatch between the parking lithium battery system and the original voltage of the commercial vehicle without changing the charging cutoff threshold of the parking lithium battery system. It not only ensures normal vehicle starting and stable operation of the vehicle's electrical appliances, but also fully utilizes the energy storage efficiency and range of the lithium battery system, and has significant practical value and market promotion value.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A voltage adaptation method for a parking lithium battery system, characterized in that, include: Battery cell assembly, protection board, selector switch, vehicle electrical components, first branch circuit and second branch circuit; The battery cell assembly, the protection board, the selector switch, the vehicle electrical components, the first branch, and the second branch constitute a parallel circuit. The positive terminal of the battery cell assembly is electrically connected to the input terminal of the first branch, the input terminal of the second branch, and the input terminal of the protection board, respectively. The output terminals of the first branch and the second branch are electrically connected to the input terminal of the vehicle electrical components. The protection board controls the selection switch to connect the first branch or the second branch; The first branch is a short-circuit circuit, and a voltage regulating component is connected in series in the second branch.

2. The voltage adaptation method for a parking lithium battery system according to claim 1, characterized in that, The protection board collects the real-time voltage of the battery cell assembly. It also stores the vehicle's highest voltage value. ; when When this occurs, the selection switch connects to the first branch; when When this occurs, the selection switch connects to the second branch.

3. The voltage adaptation method for a parking lithium battery system according to claim 2, characterized in that, when When the selection switch connects the second branch, the voltage regulation component reduces the voltage of the... to equal to Then, power is supplied to the vehicle's electrical appliances through the second branch.

4. The voltage adaptation method for a parking lithium battery system according to claim 1, characterized in that, The battery cell assembly includes multiple battery cells, and the protection board is electrically connected to each of the battery cells. The protection board collects the real-time voltage of each battery cell in real time.

5. The voltage adaptation method for a parking lithium battery system according to claim 1, characterized in that, The protection board triggers the switching of the selector switch contacts via a voltage signal.

6. The voltage adaptation method for a parking lithium battery system according to claim 1, characterized in that, The selection switch is an electromagnetic switch or an electronic switching switch.

7. The voltage adaptation method for a parking lithium battery system according to claim 1, characterized in that, The voltage regulation component is a voltage regulator or a DC step-down module.

8. The voltage adaptation method for a parking lithium battery system according to claim 1, characterized in that, It also includes a power generation device, the output of which is electrically connected to the output of the first branch and the output of the second branch.

9. The voltage adaptation method for a parking lithium battery system according to claim 8, characterized in that, The connection node between the power generation device and the first branch is the same node as the connection node between the vehicle electrical equipment and the first branch.

10. The voltage adaptation method for a parking lithium battery system according to claim 1, characterized in that, The response time for switching between the first branch and the second branch is ≤10ms.

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