Starting battery main loop and starting battery

Abstract

The utility model is suitable for the technical field of starting batteries, and provides a starting battery main loop and a starting battery. The starting battery main loop comprises a contactor, a charging switch, a discharging switch, a DC / DC converter and a control switch; the first end of the contactor, the first end of the charging switch and the output end of the DC / DC converter are jointly connected to serve as the first end of the starting battery main loop, the second end of the contactor, the first end of the discharging switch and the input end of the DC / DC converter are jointly connected to serve as the second end of the starting battery main loop, and the first end of the control switch serves as the third end of the starting battery main loop. The second end of the charging switch is connected with the second end of the discharging switch, and the second end of the control switch is connected with the grounding end and the controlled end of the DC / DC converter. According to the starting battery main loop provided by the invention, the current of the lithium ion starting battery main loop during charging can be limited through the DC / DC converter, hiccup protection caused by overcurrent of a charging system can be prevented, and the robustness of the lithium ion starting battery is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of starting batteries, and in particular relates to a starting battery main circuit and a starting battery. Background Art

[0002] Current starting batteries are usually lead-acid batteries, but compared to lithium-ion batteries, lead-acid batteries have lower performance, so people have begun to study the use of lithium-ion batteries to replace lead-acid batteries as starting batteries.

[0003] However, due to the small internal resistance of lithium-ion batteries, the charging system may experience overcurrent problems due to a sudden increase in external input voltage when the lithium-ion battery is charging, which may cause the charging system to hiccup and ultimately lead to the charging system being unable to operate normally. Therefore, the robustness of existing lithium-ion starting batteries is low. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a starter battery main circuit and a starter battery to solve the technical problem of low robustness of lithium-ion starter batteries in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a starter battery main circuit, including a contactor, a charging switch, a discharging switch, a DC / DC converter, and a control switch;

[0006] The first end of the contactor, the first end of the charging switch and the output end of the DC / DC converter are connected together as the first end of the starting battery main circuit, the second end of the contactor, the first end of the discharging switch and the input end of the DC / DC converter are connected together as the second end of the starting battery main circuit, the first end of the control switch serves as the third end of the starting battery main circuit, the second end of the charging switch is connected to the second end of the discharging switch, and the second end of the control switch is connected to the ground terminal and the controlled terminal of the DC / DC converter.

[0007] Optionally, the maximum tolerable current of the contactor is greater than the maximum tolerable current of the charging switch and the discharging switch.

[0008] Optionally, the charging switch includes a first switch and a first diode; the first end of the first switch and the anode of the first diode are connected together as the first end of the charging switch, and the second end of the first switch and the cathode of the first diode are connected together as the second end of the charging switch.

[0009] Optionally, the discharge switch includes a second switch and a second diode; the first end of the second switch and the anode of the second diode are connected together as the first end of the discharge switch, and the second end of the second switch and the cathode of the second diode are connected together as the second end of the discharge switch.

[0010] Optionally, the starting battery main circuit further includes a controller; the controller is connected to the controlled end of the contactor, the controlled end of the first switch, the controlled end of the second switch and the controlled end of the control switch.

[0011] Optionally, types of the first switch, the second switch and the control switch include relays, field effect transistors, bipolar junction transistors, insulated gate bipolar transistors and silicon controlled rectifiers.

[0012] Optionally, the first end of the starting battery main circuit is connected to the anode of the battery, the second end of the starting battery main circuit is connected to a power source or a load, and the third end of the starting battery main circuit is connected to the cathode of the battery and the power source or the load.

[0013] Optionally, the battery is a lithium-ion battery.

[0014] Optionally, the starting battery main circuit also includes a current sensor.

[0015] In a second aspect, an embodiment of the present application provides a starting battery, comprising a starting battery main circuit and a battery as described in any one of the first aspects.

[0016] The starter battery main circuit and the starter battery provided by the embodiments of the present application have the following beneficial effects:

[0017] The starter battery main circuit provided by the embodiment of the present application includes a contactor, a charging switch, a discharging switch, a DC / DC converter and a control switch; the first end of the contactor, the first end of the charging switch and the output end of the DC / DC converter are connected together as the first end of the starter battery main circuit, the second end of the contactor, the first end of the discharging switch and the input end of the DC / DC converter are connected together as the second end of the starter battery main circuit, the first end of the control switch is used as the third end of the starter battery main circuit, the second end of the charging switch is connected to the second end of the discharging switch, and the second end of the control switch is connected to the ground terminal and the controlled end of the DC / DC converter. The starter battery main circuit provided by the present application can be applied to lithium-ion starter batteries, and the DC / DC converter in the starter battery main circuit can be used to limit the current of the lithium-ion starter battery main circuit during charging, so as to prevent the charging system from overcurrent and hiccup protection, avoid the phenomenon that the charging system cannot operate normally, and improve the robustness of the lithium-ion starter battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic structural diagram of a starter battery main circuit provided in an embodiment of the present application;

[0020] Figure 2 A schematic structural diagram of a starter battery main circuit provided in another embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of a starting battery provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] It should be noted that the terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. In the description of the embodiments of the present application, unless otherwise specified, "multiple" refers to two or more than two, and "at least one", "one or more" refers to one, two or more. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, it is defined that the "first" and "second" features can explicitly or implicitly include one or more of the features.

[0023] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0024] In practical applications, different types of starting batteries need to meet the requirements of short-term high current output and long-term low current standby. In addition, due to the low internal resistance of lithium-ion batteries, the use of lithium-ion batteries as starting batteries also needs to solve the problem of charging system overcurrent caused by the sudden increase in external input voltage when charging lithium-ion batteries, which in turn causes the charging system to hiccup protection, and ultimately causes the charging system to fail to operate normally.

[0025] The starting battery main circuit provided in the embodiment of the present application can be applied to lithium-ion starting batteries, which can not only meet the requirements of short-term high-current output and long-term low-current standby required by the starting battery, but also solve the problem of overcurrent in the charging system caused by the sudden increase in external input voltage when the lithium-ion battery is charging, which in turn causes hiccup protection of the charging system and ultimately causes the charging system to fail to operate normally, thereby providing robustness of the lithium-ion starting battery.

[0026] See also Figure 1 , Figure 1 A schematic structural diagram of a starting battery main circuit provided in an embodiment of the present application.

[0027] like Figure 1 As shown, the starter battery main circuit 1 can be connected to the battery 2. For example, the starter battery main circuit 1 can be connected to a lithium-ion starter battery. The starter battery main circuit 1 can also be connected to a power source or a load.

[0028] Specifically, the first end of the starter battery main circuit 1 can be connected to the anode of the battery 2, the second end of the starter battery main circuit 1 can be connected to the power supply or load, and the third end of the starter battery main circuit 1 can be connected to the cathode of the battery and the power supply or load.

[0029] More specifically, when the starter battery is in a charging state, the second end of the starter battery main circuit 1 is connected to the power supply, and the third end of the starter battery main circuit 1 is connected to the cathode of the battery and the power supply. When the starter battery is in a discharging state, the second end of the starter battery main circuit 1 is connected to the load, and the third end of the starter battery main circuit 1 is connected to the cathode of the battery and the load.

[0030] In the embodiment of the present application, the starter battery main circuit 1 may include a contactor 11 , a charging switch 12 , a discharging switch 13 , a DC / DC converter 14 and a control switch 15 .

[0031] Among them, the first end of the contactor 11, the first end of the charging switch 12 and the output end of the DC / DC converter 14 are connected together as the first end of the starting battery main circuit 1, the second end of the contactor 11, the first end of the discharge switch 13 and the input end of the DC / DC converter 14 are connected together as the second end of the starting battery main circuit 1, the first end of the control switch 15 serves as the third end of the starting battery main circuit 1, the second end of the charging switch 12 is connected to the second end of the discharge switch 13, and the second end of the control switch 15 is connected to the ground end and the controlled end of the DC / DC converter 14.

[0032] The maximum tolerable current of the contactor 11 is greater than the maximum tolerable current of the charging switch 12 and the discharging switch 13 .

[0033] Based on this, the contactor 11 can be used to meet the short-term high current output required by the lithium-ion starting battery.

[0034] Specifically, when the battery 2 needs to output a large current to the load to start the load, the contactor 11 can be closed, so that the large current output by the battery 2 is transmitted to the load through the contactor 11 .

[0035] The charging switch 12 and the discharging switch 13 can be used together to meet the long-term low-current standby requirement of the lithium-ion starting battery.

[0036] Specifically, when the battery 2 needs to output a small current to the load, the discharge switch 13 can be closed and the charging switch 12 can be opened, so that the small current output by the battery 2 is transmitted to the load through the discharge switch 13; when the battery 2 needs to obtain the current output by the power supply, the charging switch 12 can be closed and the discharge switch 13 can be opened, so that the small current input by the power supply is transmitted to the battery 2 through the charging switch 12.

[0037] The DC / DC converter 14 can be used to solve the problem of overcurrent in the charging system caused by a sudden increase in external input voltage when the lithium-ion battery is charging, which in turn causes hiccup protection in the charging system and ultimately causes the charging system to be unable to operate normally.

[0038] Specifically, the DC / DC converter 14 can limit the current of the starter battery main circuit 1 .

[0039] Exemplarily, when the power supply is charging the battery 2, the DC / DC converter 14 can obtain the current input by the power supply through the input end of the DC / DC converter 14, and can output a current less than a preset current threshold through the output end of the DC / DC converter 14 (it can be a current that is constantly less than the preset current threshold, or it can be a current that is not constantly less than the preset current threshold), so that the current of the battery main circuit 1 in the charging state is always less than the preset current threshold, thereby preventing the charging system from overcurrent and causing hiccup protection, thereby improving the robustness of the lithium-ion starting battery.

[0040] The control switch 15 is used to control the DC / DC converter 14. Specifically, when the DC / DC converter 14 is needed to limit the current of the starter battery main circuit 1, the switch 15 can be controlled to be closed; when the DC / DC converter 14 is not needed to limit the current of the starter battery main circuit 1, the switch 15 can be controlled to be opened.

[0041] In a possible implementation, the starting battery main circuit 1 may further include a controller (not shown).

[0042] The controller may be connected to the contactor 11 , the charging switch 12 , the discharging switch 13 and the controlled end of the control switch 15 .

[0043] The controller can send opening or closing instructions to the contactor 11, the charging switch 12, the discharging switch 13 and the control switch 15 through the controlled end of the contactor 11, the controlled end of the charging switch 12, the controlled end of the discharging switch 13 and the controlled end of the control switch 15, respectively, to control the contactor 11, the charging switch 12, the discharging switch 13 and the control switch 15 to open or close.

[0044] In one possible implementation, the types of the charging switch 12, the discharging switch 13 and the control switch 15 may include but are not limited to a relay, a field effect transistor (FET), a bipolar junction transistor (BJT), an insulated gate bipolar transistor (IGBT) and a silicon controlled rectifier (SCR).

[0045] As can be seen from the above, the starter battery main circuit provided by the embodiment of the present application includes a contactor, a charging switch, a discharging switch, a DC / DC converter and a control switch; the first end of the contactor, the first end of the charging switch and the output end of the DC / DC converter are connected together as the first end of the starter battery main circuit, the second end of the contactor, the first end of the discharging switch and the input end of the DC / DC converter are connected together as the second end of the starter battery main circuit, the first end of the control switch is used as the third end of the starter battery main circuit, the second end of the charging switch is connected to the second end of the discharging switch, and the second end of the control switch is connected to the ground terminal and the controlled end of the DC / DC converter. The starter battery main circuit provided by the present application can be applied to lithium-ion starter batteries, and the DC / DC converter in the starter battery main circuit can be used to limit the current of the lithium-ion starter battery main circuit during charging, so as to prevent the charging system from overcurrent and hiccup protection, avoid the phenomenon that the charging system cannot operate normally, and improve the robustness of the lithium-ion starter battery.

[0046] See also Figure 2 , Figure 2 A schematic structural diagram of a starting battery main circuit provided in another embodiment of the present application is shown in FIG. Figure 2 As shown, this embodiment and Figure 1 The difference between the corresponding embodiments is that the starter battery main circuit 1 provided in this embodiment further includes a current sensor 21 .

[0047] The first end of the current sensor 21 and the first end of the control switch 15 are connected together as the third end of the starter battery main circuit 1 , and the second end of the current sensor 21 serves as the fourth end of the starter battery main circuit 1 .

[0048] In the embodiment of the present application, the current sensor 21 is used to detect the current of the starter battery main circuit 1 so that the user can perform corresponding control according to the current of the starter battery main circuit 1.

[0049] In a possible implementation, the current sensor 21 may be a shunt, a Hall current sensor, or a fluxgate current sensor.

[0050] In one possible implementation, Figure 2 As shown, the charging switch 12 may include a first switch L1 and a first diode T1 .

[0051] The first end of the first switch L1 and the anode of the first diode T1 are connected together as the first end of the charging switch 12 , and the second end of the first switch L1 and the cathode of the first diode T1 are connected together as the second end of the charging switch 12 .

[0052] In one possible implementation, Figure 2 As shown, the discharge switch 13 may include a second switch L2 and a second diode T2.

[0053] The first end of the second switch L2 and the anode of the second diode T2 are connected together as the first end of the discharge switch 13 , and the second end of the second switch L2 and the cathode of the second diode T2 are connected together as the second end of the discharge switch 13 .

[0054] The following combination Figure 2 , the working principle of the starting battery main circuit provided in the embodiment of the present application is described in detail.

[0055] When it is necessary to discharge the load through the starting battery main circuit 1, the first end of the starting battery main circuit 1 can be connected to the anode of the lithium-ion battery, the second end of the starting battery main circuit 1 can be connected to the load, the third end of the starting battery main circuit 1 can be connected to the cathode of the lithium-ion battery, and the fourth end of the starting battery main circuit 1 can be connected to the load.

[0056] When the load needs to be started, the controller can control the contactor 11 to close, and control the charging switch 12 and the discharging switch 13 to open, so that the large current output by the lithium-ion battery is transmitted to the load through the contactor 11.

[0057] When the load is started, the controller can be used to control the discharge switch 13 to close, so that the small current output by the lithium-ion battery is transmitted to the load through the discharge switch 13 .

[0058] When the starting battery main circuit 1 needs to be charged by a power supply, the first end of the starting battery main circuit 1 can be connected to the anode of the lithium-ion battery, the second end of the starting battery main circuit 1 can be connected to the power supply, the third end of the starting battery main circuit 1 can be connected to the cathode of the lithium-ion battery, and the fourth end of the starting battery main circuit 1 can be connected to the power supply.

[0059] Afterwards, the controller can control the charging switch 12 and the DC / DC converter 14 to close, and control the discharging switch 13 to open, so that the current output by the power supply passes through the charging switch 12 and the DC / DC converter 14 and is transmitted to the lithium-ion battery to charge the lithium-ion battery.

[0060] During the charging process of the lithium-ion battery, the DC / DC converter 14 is used to limit the current of the starter battery main circuit 1 so that the current of the battery main circuit 1 in the charging state is always less than the preset current threshold, thereby preventing the charging system from overcurrent and causing hiccup protection, and ultimately improving the robustness of the lithium-ion starter battery.

[0061] In addition, the current of the starter battery main circuit 1 can be detected by the current sensor 21 so that the user can perform corresponding control according to the current of the starter battery main circuit 1 .

[0062] See also Figure 3 , Figure 3 A schematic diagram of the structure of a starting battery provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the starting battery 3 provided in the embodiment of the present application includes a starting battery main circuit 1 and a battery 2.

[0063] Among them, the starting battery main circuit 1 is connected to the battery 2.

[0064] The starting battery 3 provided in the embodiment of the present application is connected to a power source or a load.

[0065] The specific working mode of the starting battery 3 provided in the embodiment of the present application can be referred to Figure 1 and Figure 2 The corresponding embodiments will not be described in detail here.

[0066] By way of example, a practical example of a starting battery 3 is provided below.

[0067] 12.8V / 40Ah starter battery main circuit. Contactor 11 uses a DC contactor with a withstand voltage of 100V and a rated current of 100A; charging switch 12 and discharge switch 13 use an N-MOSFET group with a withstand voltage of 40V and an on-state internal resistance of 2mΩ; DC / DC converter 14 uses a step-down DC / DC converter with a constant current output of 20A, and control switch 15 uses an N-MOSFET with a withstand voltage of 30V and an on-state internal resistance of 5mΩ; current sensor 21 uses a Hall current sensor with a range of ±100A; battery 2 uses a 4S 40Ah lithium iron phosphate battery.

[0068] By way of example, another practical example of a starting battery 3 is provided below.

[0069] 25.2V / 50Ah starter battery main circuit. Contactor 11 uses a DC contactor with a withstand voltage of 150V and a rated current of 200A; charging switch 12 and discharge switch 13 use an N-MOSFET group with a withstand voltage of 60V and an on-state internal resistance of 0.5mΩ; DC / DC converter 14 uses a buck-boost DC / DC converter with a constant current output of 25A, and control switch 15 uses a magnetic latching relay with a withstand voltage of 100V and a rated current of 30A; current sensor 21 uses a fluxgate current sensor with a range of ±200A; BT uses a 7S 50Ah ternary composite oxide cathode battery.

[0070] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0072] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A starting battery main circuit, characterized in that: Including contactor, charging switch, discharging switch, DC / DC converter and control switch; The first end of the contactor, the first end of the charging switch and the output end of the DC / DC converter are connected together as the first end of the starting battery main circuit, the second end of the contactor, the first end of the discharging switch and the input end of the DC / DC converter are connected together as the second end of the starting battery main circuit, the first end of the control switch serves as the third end of the starting battery main circuit, the second end of the charging switch is connected to the second end of the discharging switch, and the second end of the control switch is connected to the ground terminal and the controlled terminal of the DC / DC converter.

2. The starting battery main circuit according to claim 1, characterized in that: The maximum tolerable current of the contactor is greater than the maximum tolerable current of the charging switch and the discharging switch.

3. The starting battery main circuit according to claim 1, characterized in that: The charging switch includes a first switch and a first diode; the first end of the first switch and the anode of the first diode are connected together as the first end of the charging switch, and the second end of the first switch and the cathode of the first diode are connected together as the second end of the charging switch.

4. The starting battery main circuit according to claim 3, characterized in that: The discharge switch includes a second switch and a second diode; the first end of the second switch and the anode of the second diode are connected together as the first end of the discharge switch, and the second end of the second switch and the cathode of the second diode are connected together as the second end of the discharge switch.

5. The starting battery main circuit according to claim 4, characterized in that: The starting battery main circuit also includes a controller; the controller is connected to the controlled end of the contactor, the controlled end of the first switch, the controlled end of the second switch and the controlled end of the control switch.

6. The starting battery main circuit according to claim 5, characterized in that: Types of the first switch, the second switch and the control switch include relays, field effect transistors, bipolar junction transistors, insulated gate bipolar transistors and silicon controlled rectifiers.

7. The starting battery main circuit according to any one of claims 1 to 6, characterized in that: The first end of the starting battery main circuit is connected to the anode of the battery, the second end of the starting battery main circuit is connected to a power source or a load, and the third end of the starting battery main circuit is connected to the cathode of the battery and the power source or the load.

8. The starting battery main circuit according to claim 7, characterized in that: The battery is a lithium-ion battery.

9. The starting battery main circuit according to claim 7, characterized in that: The starting battery main circuit also includes a current sensor.

10. A starting battery, characterized in that: The invention comprises a starting battery main circuit and a battery as described in any one of claims 1 to 9.

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