A charging system for a power battery

Abstract

This application provides a charging system for a power battery, including: a power battery, a charging power supply, a main positive relay on the power supply side, a main negative relay on the power supply side, a sampling circuit, a voltage detection module, a BMS charging management module, a negative charging relay, and a fast charging relay; the main positive relay on the power supply side is connected to the positive terminal of the charging power supply, and the main negative relay on the power supply side is connected to the negative terminal of the charging power supply; the sampling circuit is connected in series with the main positive relay and the main negative relay on the power supply side; the voltage detection module is connected in parallel with the sampling circuit, and determines the output voltage of the charging power supply by detecting the sampling voltage of the sampling circuit. The BMS charging management module controls the charging process of the power battery according to the output voltage. When the output voltage is greater than or equal to a preset voltage, the charging system of the power battery prohibits charging. The charging system of this application can effectively avoid the sticking phenomenon of relays in the charging circuit during use, and improve the safety of the charging process.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more particularly to a charging system for a power battery. Background Technology

[0002] The voltage of the power batteries used in current new energy vehicles is generally around 400V. When the power batteries of new energy vehicles are fast charged through charging equipment, such as DC charging piles, the output voltage and current of the charging power supply are large in fast charging mode. This exceeds the tolerance of the relay design and the range of the current sensor used in the charging circuit established by the electrical connection between the charging equipment and the power battery of the new energy vehicle. This can easily cause the relays in the charging circuit to stick together, affecting the charging safety of the power battery of the new energy vehicle. Summary of the Invention

[0003] In view of this, one of the technical problems solved by the embodiments of this application is to provide a charging system for a power battery that can effectively avoid the phenomenon of relay sticking in the charging circuit when the power battery is charged by a charging power source.

[0004] This application provides a charging system for a power battery, comprising:

[0005] Power battery, charging power supply, main positive relay on the power supply side, main negative relay on the power supply side, sampling circuit, voltage detection module, BMS charging management module, main charging relay and fast charging relay;

[0006] The positive terminal of the power battery is electrically connected to the main positive relay on the power supply side and the first terminal of the sampling circuit through the main charging relay.

[0007] The negative terminal of the power battery is electrically connected to the main negative terminal on the power supply side and the second terminal of the sampling circuit through the fast charging relay.

[0008] The main positive relay on the power supply side is connected to the positive terminal of the charging power supply, and the main negative relay on the power supply side is connected to the negative terminal of the charging power supply.

[0009] The first terminal of the sampling circuit is electrically connected to the main positive relay on the power supply side, and the second terminal of the sampling circuit is electrically connected to the main negative relay on the power supply side, so as to sample the output voltage of the charging power supply.

[0010] The voltage detection module is connected in parallel with the sampling circuit to determine the sampling voltage of the sampling circuit and feeds the sampling voltage back to the BMS charging management module;

[0011] When the sampled voltage is greater than or equal to the first preset voltage value, the BMS charging management module prohibits the power battery from charging.

[0012] Optionally, in one embodiment of this application, when the sampling voltage is less than a first preset voltage value, the BMS charging management module allows the power battery to be charged.

[0013] Optionally, in one embodiment of this application, the sampling circuit includes at least one sampling resistor;

[0014] The first end of the sampling resistor is connected to the main positive relay on the power supply side, the second end of the sampling resistor is connected to the main negative relay on the power supply side, and the voltage detection module is connected in parallel with the sampling resistor.

[0015] Optionally, in one embodiment of this application, the charging system for the power battery further includes: a negative charging relay, a pre-charging circuit, and a pre-charging capacitor;

[0016] The pre-charging circuit includes a pre-charging relay;

[0017] The positive terminal of the power battery is electrically connected to the first end of the pre-charging circuit;

[0018] One end of the main charging relay and the second end of the pre-charging circuit are respectively electrically connected to the positive plate of the pre-charging capacitor;

[0019] The negative terminal of the power battery is electrically connected to the first terminal of the negative charging relay;

[0020] The second terminal of the negative charging relay is electrically connected to the negative plate of the pre-charge capacitor;

[0021] The first terminal of the sampling circuit is electrically connected to the second terminal of the pre-charging circuit and the positive plate of the pre-charging capacitor, respectively. The second terminal of the sampling circuit is electrically connected to the second terminal of the fast-charging relay to sample the output voltage of the power battery.

[0022] Optionally, in one embodiment of this application, the pre-charging circuit further includes at least one pre-charging resistor, which is connected in series with the pre-charging relay.

[0023] Optionally, in one embodiment of this application, the BMS charging management module allows the power battery to be charged by:

[0024] The BMS charging management module controls the main positive relay, the main negative relay, the negative charging relay, and the fast charging relay on the power supply side to all close, so as to charge the pre-charge capacitor through the charging power supply.

[0025] When the potential difference between the positive terminal of the charging power supply and the positive plate of the pre-charge capacitor, as sampled by the sampling circuit, is less than or equal to the second preset voltage value, the BMS charging management module controls both the main positive relay and the main negative relay on the power supply side to be disconnected, and the pre-charge relay to be closed, so that the pre-charge capacitor pre-charges the power battery through the pre-charge circuit.

[0026] When the potential difference between the positive terminal of the power battery and the positive plate of the pre-charge capacitor, as sampled by the sampling circuit, is less than or equal to a third preset voltage value, the BMS charging management module controls the pre-charge relay and the negative charging relay of the pre-charge circuit to be disconnected, stopping the charging of the power battery through the pre-charge capacitor and the pre-charge circuit.

[0027] The BMS charging management module controls the main charging relay, the main positive power relay, the main negative power relay, and the fast charging relay to all close, so that the charging power supply and the power battery establish a charging circuit, and the charging power supply completes the charging of the power battery.

[0028] Optionally, in one embodiment of this application, the BMS charging management module further includes allowing the power battery to be charged by:

[0029] The BMS charging management module determines the second preset voltage value and the third preset voltage value based on the properties of the power battery and the pre-charge capacitor.

[0030] Optionally, in one embodiment of this application, the voltage detection module includes at least one instrumentation amplifier;

[0031] The instrumentation amplifier is connected in parallel with the at least one sampling resistor, and the instrumentation amplifier is used to determine the sampling voltage of the sampling circuit based on the voltage division value of the at least one sampling resistor.

[0032] Optionally, in one embodiment of this application, the BMS charging management module further includes allowing the power battery to be charged by:

[0033] When the potential difference between the positive terminal of the power battery and the output terminal of the charging power supply, as sampled by the sampling circuit, is less than a fourth preset voltage value, the BMS charging management module controls at least one of the main charging relay, the fast charging relay, and the power supply-side main positive relay to disconnect, so as to complete the charging of the power battery.

[0034] Optionally, in one embodiment of this application, the charging power source is a DC charging pile or the built-in power source of an AC charging pile.

[0035] This application provides a charging system, including: a power battery, a charging power supply, a main positive relay on the power supply side, a main negative relay on the power supply side, a sampling circuit, a voltage detection module, a BMS charging management module, a negative charging relay, and a fast charging relay; the main positive relay on the power supply side is connected to the positive terminal of the charging power supply, and the main negative relay on the power supply side is connected to the negative terminal of the charging power supply; the sampling circuit is connected in series with the main positive relay and the main negative relay on the power supply side, and the voltage detection module is connected in parallel with the sampling circuit to determine the output voltage of the charging power supply by detecting the voltage of the sampling circuit. The BMS charging management module controls the charging process of the power battery charging system according to the output voltage. When the output voltage is greater than or equal to a first preset voltage value, the BMS charging management module controls the power battery charging system to prohibit charging. The power battery charging system of this application determines whether to charge the power battery charging system based on the output voltage of the charging power supply, thereby effectively avoiding the relay sticking phenomenon caused by charging the power battery charging system when the output voltage of the charging power supply is greater than or equal to the first preset voltage value in the charging circuit, thus improving the safety of the charging process. Attached Figure Description

[0036] The following sections will describe some specific embodiments of the present application in a detailed manner, by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0037] Figure 1 A schematic diagram of a charging system for a power battery provided in an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of another power battery charging system provided in an embodiment of this application. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0040] Example 1

[0041] This application provides a charging system for a power battery, such as... Figure 1 As shown, Figure 1This is a schematic diagram of a charging system for a power battery provided in an embodiment of this application. The charging system includes: a power battery 100, a charging power supply 101, a main positive relay on the power supply side 102, a main negative relay on the power supply side 103, a sampling circuit 104, a voltage detection module 105, a fast charging relay 106, a main charging relay 107, and a BMS charging management module 108. Figure 1 (not shown in the image)

[0042] The positive terminal of the power battery 100 is electrically connected to the main positive relay 102 on the power supply side and the first terminal of the sampling circuit 104 via the main charging relay 107.

[0043] The negative terminal of the power battery 100 is electrically connected to the main negative relay 103 on the power supply side and the second terminal of the sampling circuit 104 via the fast charging relay 106.

[0044] The main positive relay 102 on the power supply side is connected to the positive terminal of the charging power supply 101, and the main negative relay 103 on the power supply side is connected to the negative terminal of the charging power supply 101.

[0045] The first terminal of the sampling circuit 104 is electrically connected to the main positive relay 102 on the power supply side, and the second terminal of the sampling circuit 104 is electrically connected to the main negative relay 103 on the power supply side, for sampling the output voltage of the charging power supply 101.

[0046] The voltage detection module 105 is connected in parallel with the sampling circuit 104 to determine the sampling voltage of the sampling circuit 104 and feed the sampling voltage back to the BMS charging management module 108.

[0047] When the sampling voltage determined by the voltage detection module 105 is greater than or equal to the first preset voltage value, the BMS charging management module 108 prohibits the power battery from charging.

[0048] Optionally, in a practical application scenario of this embodiment, when the sampling voltage determined by the voltage detection module 105 is greater than the first preset voltage value, since the output voltage of the charging power supply is directly connected to the power battery for charging and the output voltage is relatively large, it is easy for the main positive relay or the main negative relay on the power supply side to stick together during the charging process, affecting the safety of the charging process. At this time, the BMS charging management module 108 controls at least one of the main positive relay 102, the main negative relay 103, the main charging relay 107 and the fast charging relay 106 on the power supply side to disconnect, so that the electrical connection between the charging power supply 101 and the power battery 100 is disconnected, thereby avoiding the sticking phenomenon of the relays and improving the safety of the charging process.

[0049] Optionally, in one implementation of this embodiment, the BMS charging management module allows the power battery to be charged and further includes:

[0050] When the sampling voltage determined by the voltage detection module 105 is less than the first preset voltage value, the BMS charging management module 108 allows the power battery 100 to charge.

[0051] In a practical application scenario of this embodiment, when the sampling voltage determined by the voltage detection module 105 is less than the first preset voltage value, the BMS charging management module 108 controls the main positive relay 102, the main negative relay 103, the main charging relay 107, and the fast charging relay 106 on the power supply side to close, so that a charging circuit is established between the charging power supply 101 and the power battery 100 to charge the power battery 100.

[0052] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the sampling circuit 104 includes at least one sampling resistor 1041;

[0053] The first end of the sampling resistor 1041 is connected to the main positive relay 102 on the power supply side, and the second end of the sampling resistor 1041 is connected to the main negative relay 103 on the power supply side. The voltage detection module 105 is connected in parallel with the sampling resistor 1041.

[0054] In a practical application scenario of this embodiment, preferably, there are multiple sampling resistors 1041 connected in series in the sampling circuit. By detecting the voltage value divided by one sampling resistor 1041, the voltage value of the entire sampling circuit can be determined, thus determining the output voltage of the charging power supply. Since the voltage of the charging power supply is generally high during fast charging of the power battery, it can easily damage components in the charging circuit, affecting the sampling results. To ensure the safety and accuracy of the sampling, this embodiment uses a sampling circuit with multiple sampling resistors 1041 connected in series to perform voltage division sampling of the output voltage of the charging power supply 101. This ensures both the accuracy of the sampling results and the safety of the sampling process, thereby extending the service life of the power battery charging system in this embodiment.

[0055] This application provides a charging system, including: a power battery, a charging power supply, a main positive relay on the power supply side, a main negative relay on the power supply side, a sampling circuit, a voltage detection module, a BMS charging management module, a negative charging relay, and a fast charging relay; the main positive relay on the power supply side is connected to the positive terminal of the charging power supply, and the main negative relay on the power supply side is connected to the negative terminal of the charging power supply; the sampling circuit is connected in series with the main positive relay and the main negative relay on the power supply side, and the voltage detection module is connected in parallel with the sampling circuit to determine the output voltage of the charging power supply by detecting the voltage of the sampling circuit. The BMS charging management module controls the charging process of the power battery charging system according to the output voltage. When the output voltage is greater than or equal to a first preset voltage value, the BMS charging management module controls the power battery charging system to prohibit charging. The power battery charging system of this application determines whether to charge the power battery charging system based on the output voltage of the charging power supply, thereby effectively avoiding the relay sticking phenomenon caused by charging the power battery charging system when the output voltage of the charging power supply is greater than or equal to the first preset voltage value in the charging circuit, thus improving the safety of the charging process.

[0056] Example 2

[0057] Based on the power battery charging system of Embodiment 1, Embodiment 2 provides another power battery charging system, such as... Figure 2 As shown, Figure 2 This is a schematic diagram of another power battery charging system provided in an embodiment of this application. The power battery charging system further includes: a negative charging relay 201, a pre-charging circuit 202, and a pre-charging capacitor 203. The pre-charging circuit 202 includes the pre-charging relay 2021.

[0058] The positive terminal of the power battery 100 is electrically connected to the first terminal of the pre-charging circuit 202.

[0059] One end of the main charging relay 107 and the second end of the pre-charging circuit 202 are electrically connected to the positive plate of the pre-charging capacitor 203, respectively.

[0060] The negative terminal of the power battery 100 is electrically connected to the first terminal of the negative charging relay 201;

[0061] The second terminal of the negative charging relay 201 is electrically connected to the negative plate of the pre-charging capacitor 203;

[0062] The first terminal of the sampling circuit 104 is electrically connected to the second terminal of the pre-charging circuit 202 and the positive plate of the pre-charging capacitor 203, respectively. The second terminal of the sampling circuit 104 is electrically connected to the second terminal of the fast charging relay 106 to sample the output voltage of the power battery 100.

[0063] In the actual application scenario of this embodiment, when the main positive relay 102, the main negative relay 103, and the pre-charge relay 2021 on the power supply side are all disconnected, and the main charging relay 107 and the fast charging relay 106 are engaged, the sampling circuit 104 is connected in series with the power battery 100 to form a discharge circuit. At this time, the output voltage of the power battery 100 is sampled by the sampling circuit 104, and the magnitude of the output voltage value of the power battery 100 is determined by the voltage detection module 105.

[0064] Optionally, in one implementation of this embodiment, such as Figure 2 As shown, the pre-charging circuit 202 also includes at least one pre-charging resistor 2022, which is connected in series with the pre-charging relay 2021.

[0065] In one practical application scenario of this embodiment, at least one pre-charging resistor 2022 is connected in series in the pre-charging circuit 202. This can prevent the components in the pre-charging circuit, such as the pre-charging relay 2021, from sticking together during the pre-charging process when the power battery 100 is pre-charged through the pre-charging capacitor 203 via the pre-charging circuit 202. This is because the potential difference between the positive plate of the pre-charging capacitor 203 and the power battery 100 is large, which would affect the charging effect of the power battery 100.

[0066] Optionally, in one implementation of this embodiment, the BMS charging management module allows the power battery to be charged, including:

[0067] The BMS charging management module controls the main positive relay 102, the main negative relay 103, the negative charging relay 201, and the fast charging relay 106 on the power supply side to close, so as to charge the pre-charge capacitor 203 through the charging power supply 101.

[0068] When the potential difference between the positive terminal of the charging power supply 101 sampled by the sampling circuit 104 and the positive plate of the pre-charge capacitor 203 is less than or equal to the second preset voltage value, the BMS charging management module controls the main positive relay 102 and the main negative relay 103 on the power supply side to be disconnected, and the pre-charge relay 2021 to be closed, so that the pre-charge capacitor 203 pre-charges the power battery 100 through the pre-charge circuit 202.

[0069] When the potential difference between the positive terminal of the power battery 100 and the positive plate of the pre-charge capacitor 203 sampled by the sampling circuit 104 is less than or equal to the third preset voltage value, the BMS charging management module controls the pre-charge relay 2021 and the negative charging relay 201 of the pre-charge circuit 202 to be disconnected, so as to stop the charging of the power battery through the pre-charge capacitor 203 and the pre-charge circuit 202.

[0070] The BMS charging management module controls the main charging relay 107, the power supply side main positive relay 102, the power supply side main negative relay 103, and the fast charging relay 106 to all close, so that the charging power supply 101 and the power battery 100 establish a charging circuit, and the charging power supply 101 completes the charging of the power battery 100.

[0071] Optionally, in one implementation of this embodiment, the BMS charging management module allows the power battery to be charged and further includes:

[0072] The BMS charging management module determines the second preset voltage value and the third voltage value based on the properties of the power battery 100 and the pre-charge capacitor 208.

[0073] Optionally, in a practical application scenario of this embodiment, the second preset voltage value is 5% of the output voltage when the power precharge capacitor is fully charged, and the third preset voltage value is 5% of the output voltage when the power battery is fully charged. Setting the second and third preset voltage values ​​to these values ​​can ensure the normal operation of each charging circuit in the power battery charging system of this application, while avoiding damage to the components in the charging circuit, thereby effectively extending the service life of the power battery charging system provided in this embodiment.

[0074] Optionally, in one implementation of this embodiment, the voltage detection module 105 includes at least one instrumentation amplifier.

[0075] An instrumentation amplifier is connected in parallel with at least one sampling resistor 1041 in the sampling circuit 104. The instrumentation amplifier is used to determine the sampling voltage of the sampling circuit 104 based on the voltage value of at least one sampling resistor 1041, thereby determining the output voltage of the charging power supply.

[0076] In the charging equipment for power batteries of new energy vehicles, the output voltage is often large, exceeding the range of a voltage measuring device. In this embodiment, the voltage division value of the sampling resistor is measured, and the voltage division value in the sampling circuit where the sampling resistor is located is amplified by an instrumentation amplifier to determine the overall sampling voltage of the sampling circuit, which in turn determines the output voltage of the charging power supply.

[0077] Optionally, in one implementation of this embodiment, the BMS charging management module allows the power battery to be charged, and further includes: when the potential difference between the positive terminal of the power battery 100 sampled by the sampling circuit 104 and the output terminal of the charging power supply 101 is less than a fourth preset voltage value, the BMS charging management module controls at least one of the main charging relay 107, fast charging relay 106, and power supply side main positive relay 102 to disconnect, so as to complete the charging of the power battery 100.

[0078] In a practical application scenario of this embodiment, when the potential difference between the positive terminal of the power battery 100 sampled by the sampling circuit and the output terminal of the charging power supply 101 is less than the first preset voltage value, the charging of the power battery 100 is completed. In order to avoid the charging power supply 101 overcharging the power battery 100 and affecting the service life of the power battery 100, the BMS charging management module controls at least one of the main charging relay 107, fast charging relay 206 or power supply side main positive relay 102 to disconnect, so that the electrical connection between the charging power supply 101 and the power battery 100 is disconnected, and the charging power supply 101 completes the charging of the power battery 100.

[0079] Optionally, in one implementation of this embodiment, the charging power supply is a built-in charging power supply of a DC charging pile or an AC charging pile.

[0080] Both the main positive relay and the main negative relay on the power supply side are installed inside the DC charging pile or AC charging pile and are electrically connected to the charging power supply built into the charging pile.

[0081] In one practical application scenario of this embodiment, both the main positive relay and the main negative relay on the power supply side are located inside the DC charging pile or AC charging pile. This can effectively reduce the number of electrical components installed on the vehicle when using the power battery charging system of this embodiment, reduce the space occupied by the power battery charging system, reduce the complexity of the power battery charging system on the vehicle, make it easier to install inside the vehicle, and reduce the cost of the power battery charging system installed on the vehicle.

[0082] Optionally, in one implementation of this embodiment, the charging system for the power battery further includes a prompting module. The prompting module is communicatively connected to the BMS charging management module. When the output voltage of the charging power source sampled by the voltage detection module is greater than a first preset voltage, the BMS charging management module confirms that the main positive relay or the main negative relay on the power supply side inside the currently used DC or AC charging pile has become stuck. The BMS charging management module feeds back this situation through the prompting module to remind the user to change the charging pile for charging, thereby improving the intelligence of the charging system provided in this application and avoiding unnecessary losses during the charging process.

[0083] The power battery charging system provided in this embodiment, by setting a pre-charging capacitor, first charges the pre-charging capacitor through the charging power supply, and then establishes a charging circuit between the pre-charging capacitor and the power battery to pre-charge the power battery. This further avoids the phenomenon of relay sticking in the charging circuit caused by an excessive potential difference between the charging power supply and the power battery when directly charging the power battery through the charging power supply, thus further improving the safety of charging the power battery of new energy vehicles using the power battery charging system provided in this embodiment.

[0084] Specific embodiments of the subject matter have now been described. Other embodiments are within the scope of the appended claims. In some cases, the actions described in the claims can be performed in a different order and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing can be advantageous.

[0085] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0086] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0087] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0089] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0090] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0091] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0093] This application can be described in the general context of computer-executable instructions that are executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific transactions or implement specific abstract data types. This application can also be practiced in distributed computing environments where transactions are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0094] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0095] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A charging system for a power battery, characterized in that, include: Power battery, charging power supply, main positive relay on the power supply side, main negative relay on the power supply side, sampling circuit, voltage detection module, BMS charging management module, main charging relay and fast charging relay; The positive terminal of the power battery is electrically connected to the main positive relay on the power supply side and the first terminal of the sampling circuit through the main charging relay. The negative terminal of the power battery is electrically connected to the main negative relay on the power supply side and the second terminal of the sampling circuit through the fast charging relay. The main positive relay on the power supply side is connected to the positive terminal of the charging power supply, and the main negative relay on the power supply side is connected to the negative terminal of the charging power supply. The first terminal of the sampling circuit is electrically connected to the main positive relay on the power supply side, and the second terminal of the sampling circuit is electrically connected to the main negative relay on the power supply side, so as to sample the output voltage of the charging power supply. The voltage detection module is connected in parallel with the sampling circuit to determine the sampling voltage of the sampling circuit and feeds the sampling voltage back to the BMS charging management module; When the sampled voltage is greater than or equal to the first preset voltage value, the BMS charging management module prohibits the power battery from charging. The charging system for the power battery also includes: a negative charging relay, a pre-charging circuit, and a pre-charging capacitor; The pre-charging circuit includes a pre-charging relay; The positive terminal of the power battery is electrically connected to the first end of the pre-charging circuit; One end of the main charging relay and the second end of the pre-charging circuit are respectively electrically connected to the positive plate of the pre-charging capacitor; The negative terminal of the power battery is electrically connected to the first terminal of the negative charging relay; The second terminal of the negative charging relay is electrically connected to the negative plate of the pre-charge capacitor; The first terminal of the sampling circuit is electrically connected to the second terminal of the pre-charging circuit and the positive plate of the pre-charging capacitor, respectively. The second terminal of the sampling circuit is electrically connected to the second terminal of the fast-charging relay to sample the output voltage of the power battery. When the sampling voltage is less than the first preset voltage value, the BMS charging management module allows the power battery to be charged; The BMS charging management module allows the power battery to be charged, including: The BMS charging management module controls the main positive relay, the main negative relay, the negative charging relay, and the fast charging relay on the power supply side to all close, so as to charge the pre-charge capacitor through the charging power supply. When the potential difference between the positive terminal of the charging power supply and the positive plate of the pre-charge capacitor, as sampled by the sampling circuit, is less than or equal to the second preset voltage value, the BMS charging management module controls both the main positive relay and the main negative relay on the power supply side to be disconnected, and the pre-charge relay to be closed, so that the pre-charge capacitor pre-charges the power battery through the pre-charge circuit. When the potential difference between the positive terminal of the power battery and the positive plate of the pre-charge capacitor, as sampled by the sampling circuit, is less than or equal to a third preset voltage value, the BMS charging management module controls the pre-charge relay and the negative charging relay of the pre-charge circuit to be disconnected, stopping the charging of the power battery through the pre-charge capacitor and the pre-charge circuit. The BMS charging management module controls the main charging relay, the power supply-side main positive relay, the power supply-side main negative relay, and the fast charging relay to all close, so that the charging power supply and the power battery establish a charging circuit, and the charging power supply completes the charging of the power battery.

2. The charging system for the power battery according to claim 1, characterized in that, The sampling circuit includes at least one sampling resistor; The first end of the sampling resistor is connected to the main positive relay on the power supply side, the second end of the sampling resistor is connected to the main negative relay on the power supply side, and the voltage detection module is connected in parallel with the sampling resistor.

3. The charging system for the power battery according to claim 1, characterized in that, The pre-charging circuit also includes at least one pre-charging resistor, which is connected in series with the pre-charging relay.

4. The charging system for the power battery according to claim 1, characterized in that, The BMS charging management module, which allows the power battery to be charged, also includes: The BMS charging management module determines the second preset voltage value and the third preset voltage value based on the properties of the power battery and the pre-charge capacitor.

5. The charging system for the power battery according to claim 2, characterized in that, The voltage detection module includes at least one instrumentation amplifier; The instrumentation amplifier is connected in parallel with the sampling resistor, and the instrumentation amplifier is used to determine the sampling voltage of the sampling circuit based on the voltage division value of the sampling resistor.

6. The charging system for the power battery according to claim 3, characterized in that, The BMS charging management module, which allows the power battery to be charged, also includes: When the potential difference between the positive terminal of the power battery and the output terminal of the charging power supply, as sampled by the sampling circuit, is less than a fourth preset voltage value, the BMS charging management module controls at least one of the main charging relay, the fast charging relay, and the power supply-side main positive relay to disconnect, so as to complete the charging of the power battery.

7. The charging system for a power battery according to claim 1, characterized in that, The charging power source is the built-in power source of a DC charging pile or an AC charging pile.

Images