Dual-voltage lithium battery intelligent emergency starting power supply

Abstract

The application relates to a dual-voltage lithium battery pack intelligent emergency starting power supply, which comprises a first battery pack, a second battery pack, a channel switch, a main control chip, a first battery protection unit and a second battery protection unit. The first battery pack and the second battery pack are electrically connected through the channel switch. The channel switch is used for switching the connection mode between the first battery pack and the second battery pack. The first battery protection unit is connected to the first battery pack, and the second battery protection unit is connected to the second battery pack. The main control chip is connected to the first battery protection unit, the second battery protection unit and the channel switch. The first battery protection unit and the second battery protection unit are used for protecting the first battery pack and the second battery pack. The application has the effects of reducing the short circuit probability of the emergency starting power supply when the connection mode between different battery packs is switched, balancing the battery pack voltage and prolonging the service life of the battery pack.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to a dual-voltage lithium battery pack intelligent emergency start-up power supply. Background Technology

[0002] Emergency jump starters have the advantages of fast response and high safety, and are widely used for emergency starting of vehicles, equipment, and aircraft (hereinafter collectively referred to as loads). They can complete emergency starting in low temperature environments and when the battery is depleted, so that the load can operate normally.

[0003] With the increasingly widespread use of lithium batteries, emergency jump starters made from lithium batteries have become the future development trend. Commonly used lithium battery emergency jump starters are usually divided into 12V and 24V categories based on their starting voltage, and they are generally not compatible with both voltages simultaneously. Therefore, it is necessary to propose a lithium battery emergency jump starter (hereinafter referred to as an emergency jump starter) that can simultaneously support both 12V and 24V starting voltages.

[0004] Existing emergency jump starters that are compatible with both 12V and 24V typically use a main control chip to control relays or connectors to enable series or parallel connection or independent operation of different battery packs. When the control timing is incorrect or the relay malfunctions, it may cause a direct short circuit between the positive and negative terminals of the battery. Such errors or malfunctions are, to some extent, unavoidable. Sometimes, the contacts may even melt and become welded shut due to excessive current, making it impossible to disconnect the battery. There is room for improvement. Utility Model Content

[0005] To reduce the probability of short circuits occurring between different battery packs when switching connection methods in an emergency start-up power supply, this application provides a dual-voltage lithium battery pack intelligent emergency start-up power supply.

[0006] The dual-voltage lithium battery pack intelligent emergency starter power supply provided in this application adopts the following technical solution:

[0007] A dual-voltage lithium battery pack intelligent emergency starter includes a first battery pack, a second battery pack, a channel switch, a main control chip, a first battery protection unit, and a second battery protection unit. The first battery pack and the second battery pack are electrically connected through the channel switch, which is used to switch the connection mode between the first battery pack and the second battery pack. The first battery protection unit is connected to the first battery pack, and the second battery protection unit is connected to the second battery pack. The main control chip is connected to the first battery protection unit, the second battery protection unit, and the channel switch. The first battery protection unit and the second battery protection unit cooperate to protect the first battery pack and the second battery pack.

[0008] By adopting the above technical solution, the first battery pack is connected to the first battery protection unit, and the second battery pack is connected to the second battery protection unit. When the channel switch adjusts the connection method between the first battery pack and the second battery pack, the main control chip regulates the working state of the first battery protection unit and the second battery protection unit, so that the connection method between the first battery pack and the second battery pack can match the set connection method, making the cells of the first battery pack and the second battery pack relatively balanced, and reducing the probability of a short circuit between the first battery pack and the second battery pack due to abnormality of the channel switch.

[0009] Preferably, a bridging unit is connected between the first battery pack and the second battery pack. The bridging unit is electrically connected to the main control chip. The bridging unit is used to balance the voltage balance between the first battery pack and the second battery pack when the connection mode is switched.

[0010] By adopting the above technical solution, when the channel switch switches the connection mode between the first battery pack and the second battery pack, the voltage between the first battery pack and the second battery pack is balanced by the bridging unit. This reduces the probability of damage to the first battery pack, and / or the second battery pack, and / or the channel switch caused by the voltage imbalance between the first battery pack and the second battery pack after the connection mode is switched, which would result in the high voltage end charging the low voltage end and thus causing a large current flowing into the low voltage end.

[0011] Preferably, the channel switch is used to enable series or parallel connection between the first battery pack and the second battery pack, or for the first battery pack and the second battery pack to operate independently.

[0012] By adopting the above technical solution, and through the cooperation of the channel switch and the main control chip, the first battery pack and the second battery pack can be connected in series or in parallel, or the first battery pack and the second battery pack can work independently, which is highly practical.

[0013] Preferably, the first battery protection unit includes a protection switch, which is connected to the negative terminal of the first battery pack.

[0014] By adopting the above technical solution, the first battery pack can be switched on and off through the first battery protection switch, which helps to improve the safety performance of the first battery protection unit during operation.

[0015] Preferably, the first battery protection unit further includes a battery protection controller, which is connected to the protection switch.

[0016] By adopting the above technical solution, the working status of the first battery pack is detected and controlled by the battery protection controller. When an abnormal situation occurs, the battery protection controller can act quickly, reducing the probability of the first battery pack being damaged due to the abnormal situation.

[0017] Preferably, the first battery protection unit further includes a current sensor, the two ends of which are respectively connected to the negative terminal of the first battery pack and the protection switch, and the battery protection controller is connected to the current sensor.

[0018] By adopting the above technical solution, the current sensor detects the current value flowing into or out of the first battery pack and feeds it back to the battery protection controller, which helps the battery protection controller to detect abnormal current signals in a timely manner.

[0019] Preferably, the first battery protection unit includes a battery balancing circuit, which is connected to the first battery pack and is used to balance the SOC and OCV of the first battery pack.

[0020] By adopting the above technical solution, the SOC and OCV in the first battery pack are balanced by the battery balancing circuit, thereby improving the overall performance of the first battery pack, extending its service life, and enhancing its safety.

[0021] Preferably, it also includes a fuse connected to the positive terminal of the first battery pack.

[0022] By adopting the above technical solution, when the first battery pack experiences overvoltage or overcurrent, the fuse will trip, thereby reducing the probability of damage to the load caused by excessive voltage or excessive current flowing from the first battery pack.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The main control chip regulates the working status of the first battery protection unit and the second battery protection unit, so that the connection method between the first battery pack and the second battery pack can be consistent with the set connection method, so that the voltage between the first battery pack and the second battery pack is relatively balanced, reducing the probability of short circuit between the first battery pack and the second battery pack due to abnormal channel switch.

[0025] 2. By bridging the voltage between the first battery pack and the second battery pack, the probability of damage to the first battery pack, and / or the second battery pack, and / or the channel switch is reduced due to the voltage imbalance between the first battery pack and the second battery pack after switching connection methods, which causes the high voltage end to charge the low voltage end, resulting in a large current flowing into the low voltage end.

[0026] 3. The battery protection controller detects and regulates the working status of the first battery pack. When an abnormal situation occurs, the battery protection controller can act quickly to reduce the probability of the first battery pack being damaged due to abnormality. Attached Figure Description

[0027] Figure 1 This is a block diagram of the overall circuit principle of a dual-voltage lithium battery pack intelligent emergency start-up power supply according to an embodiment of this application.

[0028] Figure 2 This is a circuit diagram illustrating the connection between the first battery protection unit and the first battery pack, and the second battery protection unit and the second battery pack in a dual-voltage lithium battery pack intelligent emergency starter power supply according to an embodiment of this application.

[0029] Figure 3 This is a circuit diagram illustrating the connection relationship between the first battery pack and the first battery protection unit in a dual-voltage lithium battery pack intelligent emergency start-up power supply according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached diagram: 1. First battery pack; 2. Second battery pack; 3. Channel switch; 31. First switching switch; 32. Second switching switch; 33. Third switching switch; 4. Main control chip; 5. First battery protection unit; 51. Protection switch; 52. Battery protection controller; 53. Current sensor; 54. Battery balancing circuit; 6. Second battery protection unit; 7. Bridging unit; 8. Fuse. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses a dual-voltage lithium battery pack intelligent emergency starter power supply. (Refer to...) Figure 1 and Figure 2 A dual-voltage lithium battery pack intelligent emergency starter includes a first battery pack 1, a second battery pack 2, a channel switch 3, a main control chip 4, a first battery protection unit 5, and a second battery protection unit 6. The first battery pack 1 and the second battery pack 2 are electrically connected through the channel switch 3, which is used to switch the connection mode between the first battery pack 1 and the second battery pack 2. The first battery protection unit 5 is connected to the first battery pack 1, and the second battery protection unit 6 is connected to the second battery pack 2. The main control chip 4 is connected to the first battery protection unit 5, the second battery protection unit 6, and the channel switch 3. The first battery protection unit 5 and the second battery protection unit 6 work together to protect the first battery pack 1 and the second battery pack 2.

[0033] Specifically, the first battery pack 1 is set as BAT1, and the second battery pack 2 is set as BAT2. The first battery pack 1 and the second battery pack 2 are conventional lithium batteries, and their specific composition and working principle will not be described in detail here.

[0034] Furthermore, the channel switch 3 is used to realize the series or parallel connection between the first battery pack 1 and the second battery pack 2, or to enable the first battery pack 1 and the second battery pack 2 to work independently.

[0035] The channel switch 3 includes a first switching switch 31, a second switching switch 32, and a third switching switch 33. The first switching switch 31 is set as PS1, the second switching switch 32 is set as PS2, and the third switching switch 33 is set as PS3. The two ends of the first switching switch 31 are respectively connected to the negative terminal of the first battery pack 1 and the negative terminal of the second battery pack 2. The two ends of the second switching switch 32 are respectively connected to the positive terminal of the first battery pack 1 and the negative terminal of the second battery pack 2. The two ends of the third switching switch 33 are respectively connected to the positive terminal of the first battery pack 1 and the positive terminal of the second battery pack 2.

[0036] Further, refer to Table 1:

[0037] PS1 PS2 PS3 Switching results Output voltage value / V Turn off Conductivity Turn off Series 24 Conductivity Turn off Conductivity in parallel 12 Turn off Turn off Turn off Stop output 0 Conductivity Turn off Turn off Single output 12 Turn off Turn off Conductivity Single output 12

[0038] Table 1

[0039] As shown in Table 1, by cooperating with the first switching switch 31, the second switching switch 32 and the third switching switch 33, the first battery pack 1 and the second battery pack 2 can achieve the five connection methods in Table 1 to output 12V, 24V or 0V voltage to the load.

[0040] Therefore, the first battery pack 1 is connected to the first battery protection unit 5, and the second battery pack 2 is connected to the second battery protection unit 6. When the channel switch 3 adjusts the connection method between the first battery pack 1 and the second battery pack 2, the main control chip 4 controls the working state of the first battery protection unit 5 and the second battery protection unit 6, so that the connection method between the first battery pack 1 and the second battery pack 2 can match the set connection method, so that the cells of the first battery pack 1 and the second battery pack 2 are relatively balanced, reducing the probability of a short circuit between the first battery pack 1 and the second battery pack 2 due to an abnormality in the channel switch 3.

[0041] Meanwhile, the first battery protection unit 5 is integrated on the first battery pack 1, and the second battery protection unit 6 is integrated on the second battery pack 2. The first battery protection unit 5 and the second battery protection unit 6 have the same circuit composition, but the first battery protection unit 5 and the second battery protection unit 6 can work independently. For better understanding, the first battery protection unit 5 and the first battery pack 1 will be described in detail below.

[0042] Reference Figure 2 and Figure 3 A bridging unit 7 is connected between the first battery pack 1 and the second battery pack 2. The bridging unit 7 is electrically connected to the main control chip 4. The bridging unit 7 is used to balance the voltage balance between the first battery pack 1 and the second battery pack 2 when the connection mode is switched.

[0043] Specifically, the bridging unit 7 can be a resistor or a resistor array. In this embodiment, the bridging unit 7 is preferably a DC / DC converter, specifically a bidirectional buck-boost converter (including but not limited to: ① a buck-boost converter composed of buck-boost ICs, such as SC8802; ② a synchronous buck converter composed of high-side and low-side driver ICs plus external MOS, such as EG2132), which has the advantages of high efficiency and low heat generation. The two ends of the bridging unit 7 are respectively connected to the first battery pack 1 and the second battery pack 2, and connected to the main control chip 4 (Microcontroller Unit, MCU), which controls the operating state of the bridging unit 7.

[0044] Its function is, for example, when the voltage of the first battery pack 1 is higher than the voltage of the second battery pack 2, the main control chip 4 adjusts the working state of the bridging unit 7 so that the first battery pack 1 charges the second battery pack 2 until the voltage of the first battery pack 1 and the voltage of the second battery pack 2 are in a balanced state, so as to solve the problem of voltage imbalance between the first battery pack 1 and the second battery pack 2.

[0045] Meanwhile, in the initial state, when the voltage of the first battery pack 1 is greater than the voltage of the second battery pack 2, the current between the first battery pack 1 and the second battery pack 2 is larger. Through the adjustment function of the bridging unit 7, the voltage difference between the first battery pack 1 and the second battery pack 2 will decrease. At this time, the current between the first battery pack 1 and the second battery pack 2 will also decrease synchronously.

[0046] In addition, through the cooperation of the main control chip 4 and the bridging unit 7, when the output voltage of the first battery pack 1 and the second battery pack 2 cannot meet the voltage value required for the load to work, the first battery pack 1 will charge the second battery pack 2 (or the second battery pack 2 will charge the first battery pack 1), so that the first battery pack 1 (or the second battery pack 2) can meet the voltage required for the load to work normally.

[0047] Reference Figure 2 and Figure 3 The first battery protection unit 5 includes a protection switch 51, which is configured as PS and is connected to the negative terminal of the first battery pack 1.

[0048] Specifically, the protection switch 51 is connected to the negative terminal of the dual-voltage intelligent emergency start-up power supply. The first battery pack 1 is switched on and off through the first battery protection switch 51, which helps to improve the safety performance of the first battery protection switch 51 during operation.

[0049] Among them, the protection switch 51 can be an electronic switch such as PMOS, NMOS, bipolar transistor, IGBT, thyristor, or bidirectional thyristor, or it can be a relay or other mechanical switch. The key point is that the current capacity of the protection switch 51 must be greater than the current flowing into the first battery pack 1.

[0050] Reference Figure 2 and Figure 3 The first battery protection unit 5 also includes a battery protection controller 52, which is configured as a BPC (Battery Protection Controller). The battery protection controller 52 is connected to the protection switch 51. The battery protection controller 52 provides undervoltage protection (UVP), overvoltage protection (OVP), overcurrent protection (OCP), undertemperature protection (UTP), overtemperature protection (OTP), and short circuit protection (SCP) for the first battery pack 1. When the first battery pack 1 malfunctions, the battery protection controller 52 can quickly control the protection switch 51 to disconnect the connection between the first battery pack 1 and the negative terminal of the dual-voltage intelligent emergency start power supply.

[0051] Reference Figure 2 and Figure 3 The first battery protection unit 5 also includes a current sensor 53, with its two ends connected to the negative terminal of the first battery pack 1 and the protection switch 51, respectively. The battery protection controller 52 is connected to the current sensor 53.

[0052] Its function is to detect the current value flowing into or out of the first battery pack 1 through the current sensor 53 and send the detected value to the battery protection controller 52 in real time, thereby enabling the battery protection controller 52 to monitor the current value flowing into or out of the first battery pack 1 in real time. When the current value flowing into or out of the first battery pack 1 is abnormal, the battery protection controller 52 can quickly issue a control command to the protection switch 51 to activate the protection switch 51, thereby putting the protection switch 51 in the open (or closed) state, reducing the probability of damage to the first battery pack 1 and / or the protection switch 51 due to abnormal current flowing into or out of the first battery pack 1.

[0053] Correspondingly, the first battery protection unit 5 includes a battery balancing circuit 54, which is connected to the first battery pack 1. The battery balancing circuit 54 is used to balance the SOC (State of Charge) and OCV (Open Circuit Voltage) of the first battery pack 1.

[0054] It should be noted that the first battery pack 1 and the second battery pack 2 are each composed of several lithium batteries connected together, thus forming the first battery pack 1 and the second battery pack 2. Since the first battery pack 1 and the second battery pack 2 have the same composition, the first battery pack 1 will be used for description below.

[0055] Its function is to adjust the SOC and OCV between several lithium batteries in the first battery pack 1 by balancing the battery balancing circuit 54, which helps to reduce the probability of energy loss caused by voltage difference between several lithium batteries in the first battery pack 1 or the rapid power loss of the dual-voltage intelligent emergency start-up power supply.

[0056] In addition, a fuse 8 is included, which is configured as an FS (fuse) and connected to the positive terminal of the first battery pack 1. When the first battery pack 1 experiences a short circuit or overvoltage, the fuse 8 will disconnect from the subsequent circuit. When the first battery pack 1 experiences overvoltage or overcurrent, the fuse 8 will trip, reducing the probability of damage to the load due to excessive voltage or current flowing out of the first battery pack 1.

[0057] The implementation principle of a dual-voltage lithium battery pack intelligent emergency starter power supply according to an embodiment of this application is as follows: A first battery pack 1 is connected to a first battery protection unit 5, and a second battery pack 2 is connected to a second battery protection unit 6. When the channel switch 3 adjusts the connection method between the first battery pack 1 and the second battery pack 2, the main control chip 4 regulates the working state of the first battery protection unit 5 and the second battery protection unit 6, so that the connection method between the first battery pack 1 and the second battery pack 2 can match the set connection method, making the cells of the first battery pack 1 and the second battery pack 2 relatively balanced, reducing the probability of a short circuit between the first battery pack 1 and the second battery pack 2 due to an abnormality in the channel switch 3. At the same time, the bridging unit 7 balances the voltage between the first battery pack 1 and the second battery pack 2, reducing the probability of damage to the first battery pack 1 and / or the second battery pack 2 and / or the channel switch 3 due to the voltage imbalance between the first battery pack 1 and the second battery pack 2 after switching the connection method, which would cause the high voltage end to charge the low voltage end, resulting in a large current flowing into the low voltage end.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-voltage lithium battery pack intelligent emergency starter, characterized in that: The system includes a first battery pack (1), a second battery pack (2), a channel switch (3), a main control chip (4), a first battery protection unit (5), and a second battery protection unit (6). The first battery pack (1) and the second battery pack (2) are electrically connected through the channel switch (3). The channel switch (3) is used to switch the connection mode between the first battery pack (1) and the second battery pack (2). The first battery protection unit (5) is connected to the first battery pack (1), and the second battery protection unit (6) is connected to the second battery pack (2). The main control chip (4) is connected to the first battery protection unit (5), the second battery protection unit (6), and the channel switch (3). The first battery protection unit (5) and the second battery protection unit (6) work together to protect the first battery pack (1) and the second battery pack (2).

2. The intelligent emergency start-up power supply for a dual-voltage lithium battery pack according to claim 1, characterized in that: A bridging unit (7) is connected between the first battery pack (1) and the second battery pack (2). The bridging unit (7) is electrically connected to the main control chip (4). The bridging unit (7) is used to balance the voltage balance between the first battery pack (1) and the second battery pack (2) when the connection mode is switched between them.

3. The intelligent emergency starter power supply for a dual-voltage lithium battery pack according to claim 1, characterized in that: The channel switch (3) is used to realize the series or parallel connection between the first battery pack (1) and the second battery pack (2), or the first battery pack (1) and the second battery pack (2) can work independently.

4. The intelligent emergency start-up power supply for a dual-voltage lithium battery pack according to claim 1, characterized in that: The first battery protection unit (5) includes a protection switch (51), which is connected to the negative terminal of the first battery pack (1).

5. The intelligent emergency start-up power supply for a dual-voltage lithium battery pack according to claim 4, characterized in that: The first battery protection unit (5) further includes a battery protection controller (52), which is connected to the protection switch (51).

6. The intelligent emergency starter power supply for a dual-voltage lithium battery pack according to claim 5, characterized in that: The first battery protection unit (5) further includes a current sensor (53), the two ends of which are connected to the negative terminal of the first battery pack (1) and the protection switch (51), respectively, and the battery protection controller (52) is connected to the current sensor (53).

7. The intelligent emergency starter power supply for a dual-voltage lithium battery pack according to claim 1, characterized in that: The first battery protection unit (5) includes a battery balancing circuit (54), which is connected to the first battery pack (1) and is used to balance the SOC and OCV of the first battery pack (1).

8. The intelligent emergency start-up power supply for a dual-voltage lithium battery pack according to claim 1, characterized in that: It also includes a fuse (8) connected to the positive terminal of the first battery pack (1).

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