Battery charging circuit

Abstract

The utility model provides a battery charging circuit. The battery charging circuit comprises a heating circuit, a pre-charging circuit and a power supply circuit, wherein the heating circuit comprises a heating relay; the pre-charging circuit comprises a pre-charging relay; the heating relay and the pre-charging relay are connected to a first contact, and the other end of the first contact is connected to one pole of the battery pack; the heating relay and the pre-charging relay are connected to the second contact through a switch KR2 and a switch KC2; and the other end of the second contact is connected to the other pole of the battery pack. Through independence of the heating and pre-charging loop, increase of relay contacts and intelligent diagnosis and control of the BMS, the safety and reliability of the system are improved, the battery heating and pre-charging process is optimized, conflicts are avoided, the design complexity and cost are reduced, and meanwhile the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of lithium batteries, and particularly relates to a battery charging circuit. BACKGROUND

[0002] In a general battery charging circuit, in order to prevent the damage of components caused by excessive current impact of the main circuit at the power-on moment, a pre-charging circuit needs to be configured for protection, and a mainstream pre-charging scheme in the prior art is to control the on-off of the pre-charging circuit by a pre-charging relay, so as to realize pre-charging. Meanwhile, a heating film is often configured inside a battery pack, which is controlled by a heating relay, so that the battery can be normally used in a low-temperature environment.

[0003] The pre-charging resistor used in the prior art has a large volume and heavy weight, and the influence of the volume and weight of the high-voltage box cannot be ignored, which affects the layout of the battery system to some extent; in addition, the pre-charging resistor has a certain degree of failure rate, which affects the safe operation of the system. CONTENT OF THE UTILITY MODEL

[0004] In view of the defects of the prior art, the application provides a battery charging circuit, in which the pre-charging resistor in the high-voltage box is replaced by the heating film configured inside the battery pack, so that the high-voltage box is more portable and compact, and space is saved; meanwhile, the reduction of the number of parts can improve the stability of the system, and the heating relay and the pre-charging relay work cooperatively to provide necessary heating and pre-charging functions in the charging process, so as to ensure the temperature control and safety of the battery during charging, thereby improving the charging efficiency and prolonging the service life of the battery.

[0005] The battery charging circuit provided in the application comprises a heating circuit, a pre-charging circuit, and a power supply circuit.

[0006] The heating circuit comprises a heating relay.

[0007] The pre-charging circuit comprises a pre-charging relay.

[0008] The heating relay and the pre-charging relay are connected to a first contact, and the other end of the first contact is connected to one pole of the battery pack.

[0009] The heating relay and the pre-charging relay are connected to a second contact through a switch KR2 and a switch KC2, and the other end of the second contact is connected to the other pole of the battery pack.

[0010] The circuit proposed in the application integrates the heating circuit and the pre-charging circuit together, can heat the battery in a low temperature environment through the heating relay control, ensures the battery to work in a suitable temperature range, and improves the battery performance and service life. Meanwhile, through the pre-charging relay control, the pre-charging can be performed before the battery charging, the large current impact is avoided, and the battery and the circuit element are protected. The simple circuit structure, flexible working mode switching, efficient energy saving characteristics and high safety make it have significant technical advantages in the battery charging system.

[0011] Preferably, the battery charging circuit proposed in the application comprises a heating relay.

[0012] Preferably, the battery charging circuit comprises that the heating relay coil is connected with a heating relay power supply.

[0013] Preferably, the battery charging circuit comprises that when the system needs to be heated and the pre-charging relay is in an open state, the switch KR1 and the switch KR2 are closed, the heating film arranged in the battery pack is connected to the heating loop, and the battery is heated.

[0014] The battery charging circuit proposed in the application can accurately control the current flowing to the heating loop through the switch KR1 in the heating function aspect, avoids the problems of too large or too small current and unnecessary waste of electric energy. Through the intelligent control of the state of the switch, the heating loop is enabled when necessary, the battery is effectively heated, and the temperature of the battery is ensured to be in a suitable range to realize a more energy-saving charging process. Meanwhile, the heating film arranged in the battery pack can replace the pre-charging resistor in the high-voltage box, so that the high-voltage box is more portable and compact, and space is saved; the reduction of the number of parts can improve the system stability.

[0015] Preferably, the battery charging circuit proposed in the application comprises a pre-charging relay.

[0016] Preferably, the battery charging circuit proposed in the application comprises that the pre-charging relay coil is connected with a pre-charging relay power supply.

[0017] Preferably, the battery charging circuit proposed in the application comprises that when the system needs to be pre-charged, if the heating relay is powered on, the heating relay power supply is first disconnected, then the switch KC1 and the switch KC2 are closed, so that the heating film is connected to the pre-charging loop to perform pre-charging, the switch KC1 and the switch KC2 are disconnected after the pre-charging is completed, and the pre-charging action is ended.

[0018] If the heating relay is not powered on, the pre-charging relay is directly controlled to close the switch KC1 and the switch KC2 to start pre-charging, and the switch KC1 and the switch KC2 are disconnected after the pre-charging is completed.

[0019] Preferably, the battery charging circuit provided by the present application comprises the power supply circuit, and further comprises a total positive relay.

[0020] The battery charging circuit provided by the present application precisely controls the current through the pre-charging circuit by the switch KC1 in the pre-charging function, thereby ensuring the stability of the pre-charging process. The precise control of the pre-charging process improves the battery performance and ensures that the battery is in the best state before formal charging. The battery system that limits the current at the initial stage of charging can effectively improve the performance and life of the battery.

[0021] Compared with the prior art, the present application has the beneficial effects that:

[0022] The battery charging circuit provided by the present application comprises a pre-charging circuit and a pre-charging resistor. Through the design of the heating circuit, the heating relay and the heating film, the battery can be heated before charging, thereby improving the charging efficiency in a low-temperature environment and reducing the risk of battery damage. At the same time, the pre-charging circuit performs preliminary charging before the battery charging, thereby ensuring that the internal voltage of the battery reaches a certain level and avoiding battery damage caused by direct large-current charging.

[0023] The combination of the heating circuit and the pre-charging circuit can effectively avoid problems such as overheating, overcurrent and reverse charging of the battery during the heating and pre-charging processes, thereby prolonging the service life of the battery.

[0024] The battery charging circuit provided by the present application further comprises a heating relay, a pre-charging relay, a power supply total positive relay and a combination of switches KR1 and KC1. The circuit can intelligently select the heating or pre-charging function according to different states, thereby realizing more precise charging control. At the same time, the heating film configured in the battery pack replaces the pre-charging resistor in the high-voltage box and is connected to the heating loop, thereby more efficiently using the energy directly for battery heating and avoiding energy loss caused by the additional resistor. The heating film as a heating element can effectively convert electrical energy into heat energy, thereby improving the heating efficiency and ensuring that the battery reaches a temperature suitable for charging. The efficiency, safety and reliability of the charging system are improved. The design is simplified, the energy loss is reduced, the system complexity is reduced, the temperature control management is optimized, and the flexibility of battery charging is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of a battery charging circuit. DETAILED DESCRIPTION

[0026] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0027] Embodiment one, as shown in the present application, a battery charging circuit is provided, comprising: a heating circuit, a pre-charging circuit, and a power supply circuit; Figure 1

[0028] The heating circuit comprises a heating relay.

[0029] The pre-charging circuit comprises a pre-charging relay.

[0030] The heating relay and the pre-charging relay are connected to a first contact, and the other end of the first contact is connected to one pole of a battery pack.

[0031] The heating relay and the pre-charging relay are connected to a second contact through a switch KR2 and a switch KC2, and the other end of the second contact is connected to the other pole of the battery pack.

[0032] The battery charging circuit provided by the present application designs the heating relay and the pre-charging relay to be connected to the two poles of the battery pack through the first contact and the second contact, and to be controlled through the switch KR2 and the switch KC2. The heating and pre-charging operations can be independently controlled, ensuring that each stage of battery charging is carried out under optimal working conditions. For example, in low temperature conditions, heating is performed first and then pre-charging is performed, which helps to improve the efficiency and safety of battery charging. At the same time, through the combination of the switch KR2 and the switch KC2, the circuit control becomes simple and accurate. Through reasonable control and configuration, the overall design is simplified, and unnecessary circuit complexity is avoided, reducing production cost and maintenance difficulty. The battery charging circuit design proposed by the present application improves the charging safety, efficiency and battery protection capability, and also has the advantages of intelligent adjustment and simplified control, improving the performance and reliability of the overall system.

[0033] Preferably, the battery charging circuit provided by the present application comprises a heating relay, and the heating relay comprises a heating relay coil and a switch KR1.

[0034] Preferably, the battery charging circuit comprises that the heating relay coil is connected with a heating relay power supply.

[0035] ​Preferably, the battery charging circuit comprises: when the system needs to be heated and the pre-charge relay is in an open state, then the switch KR1 and the switch KR2 are closed, the heating film arranged in the battery pack is connected to the heating circuit, and the battery is heated.

[0036] By connecting the heating film to the heating circuit instead of the pre-charge resistor in the high-voltage box, the energy is directly used for battery heating, the energy loss caused by the additional resistor is avoided, the efficiency, safety and reliability of the charging system are improved, and the working state of the heating film is easier to monitor, so that problems can be found and repaired in time, and the maintenance difficulty is reduced.

[0037] Preferably, the battery charging circuit comprises: a pre-charge relay; the pre-charge relay comprises a pre-charge relay coil and a switch KC1.

[0038] Preferably, the battery charging circuit comprises: the pre-charge relay coil is connected with a pre-charge relay power supply.

[0039] Preferably, the battery charging circuit comprises: when the system needs to be pre-charged, if the heating relay is powered on, the heating relay power supply is first turned off, then the switch KC1 and the switch KC2 are closed, so that the heating film is connected to the pre-charge circuit, pre-charging is performed, the switch KC1 and the switch KC2 are turned off after pre-charging is completed, and the pre-charging action is ended.

[0040] If the heating relay is not powered on, the pre-charge relay is directly controlled to close the switch KC1 and the switch KC2, pre-charging is started, and the switch KC1 and the switch KC2 are turned off after pre-charging is completed.

[0041] Preferably, the battery charging circuit comprises: the power supply circuit further comprises a total positive relay.

[0042] Independent pre-charge control improves system flexibility, the pre-charge relay is independently controlled through the switch KC1, the pre-charge circuit can be quickly started when pre-charging is needed, and large current impact on the battery in the initial charging stage is avoided.

[0043] Although the example embodiments have been described with reference to the accompanying drawings, it should be understood that the above example embodiments are only examples, and are not intended to limit the scope of the application. Those of ordinary skill in the art can make various changes and modifications without departing from the scope and spirit of the application. All these changes and modifications are intended to be included in the scope of the application claimed by the appended claims.

[0044] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the description contained herein. It must be stressed, however, that any combination of the components or features taught according to any aspect of the present application can be important sufficient to confer "patentable" subject matter status on a patent application. It is therefore intended to embrace all such variations as fall within the scope of the appended claims. Applicants reserve the right to claim such variations separately or in any combination. It is intended to embrace all such later-developed alternatives, modifications and variations as fall within the scope of the appended claims.

[0045] While the application has been described in connection with specific embodiments thereof, it will be understood that it is capable of further modification and this application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.

Claims

1. A battery charging circuit, characterized by, The battery charging circuit comprises: a heating circuit, a pre-charging circuit, and a power supply circuit; wherein the heating circuit comprises a heating relay; the pre-charging circuit comprises a pre-charging relay; the heating relay and the pre-charging relay are connected to a first contact, and the other end of the first contact is connected to one pole of the battery pack; the heating relay and the pre-charging relay are connected to a second contact through a switch KR2 and a switch KC2, and the other end of the second contact is connected to the other pole of the battery pack.

2. The battery charging circuit according to claim 1, wherein the heating relay comprises a heating relay coil and a switch KR1.

3. The battery charging circuit according to claim 2, wherein the heating relay coil is connected to a heating relay power supply.

4. The battery charging circuit according to claim 3, wherein when the system needs to be heated and the pre-charging relay is in an open state, the switch KR1 and the switch KR2 are closed, the heating film arranged in the battery pack is connected to the heating circuit, and the battery is heated.

5. The battery charging circuit according to claim 1, wherein the pre-charging relay comprises a pre-charging relay coil and a switch KC1.

6. The battery charging circuit according to claim 5, wherein the pre-charging relay coil is connected to a pre-charging relay power supply.

7. The battery charging circuit according to claim 6, wherein when the system needs to be pre-charged, if the heating relay is powered on, the heating relay power supply is first turned off, and then the switch KC1 and the switch KC2 are closed, so that the heating film is connected to the pre-charging circuit and pre-charged; after the pre-charging is completed, the switch KC1 and the switch KC2 are opened, and the pre-charging action is completed; if the heating relay is not powered on, the pre-charging relay is directly controlled to close the switch KC1 and the switch KC2 to start pre-charging; after the pre-charging is completed, the switch KC1 and the switch KC2 are opened.

8. The battery charging circuit according to claim 1, wherein the power supply circuit comprises a total positive relay.

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