Battery charging control circuit, battery system and electric device

Abstract

The utility model provides a battery charging control circuit, a battery system and an electric device, and belongs to the technical field of batteries. The battery charging control circuit comprises: a main relay for connecting a battery and a charging device; the first end of the charging negative relay is used for connecting the cathode of the battery, the second end of the charging negative relay is used for connecting the cathode of the charging device, and a reference point is arranged between the first end of the charging negative relay and the cathode of the battery; and the sampling circuit is connected with the first end and the second end of the charging negative relay, and is configured to connect the first end and the second end of the charging negative relay to form a first sampling loop when the main relay is closed and the charging negative relay is turned off, and collect the first voltage of the two ends of the charging negative relay in the first sampling loop relative to the reference point. According to the charging control circuit, the real output voltage of the charging device can be detected under the condition that only the charging negative relay is arranged, so that the charging standard is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery charging control circuit, a battery system and a power consumption device. BACKGROUND

[0002] The battery is a high-voltage and high-current application, and a relay is usually used to control the connection between the battery and other elements. For example, a main relay connects the positive and / or negative of the battery, and is used to connect the positive and / or negative of the battery with other elements to provide power for other elements. A charging relay is used to control the on-off of the charging circuit between the battery and the charging device. When the battery is charging, the main relay and the charging relay are both closed. The charging relay usually includes a charging positive relay and a charging negative relay, which are respectively used to control the connection between the positive and negative of the battery and the charging device.

[0003] In order to reduce the cost, only a single charging negative relay is designed in the related art to control the formation of the charging circuit.

[0004] However, in the charging process of the battery by some charging devices (such as charging piles), it is necessary to detect the output voltage of the charging device first, and then determine whether to close the charging negative relay to form the charging circuit based on the detected output voltage of the charging device. For the case where only a single charging negative relay is designed, the output voltage of the charging device cannot be detected when the charging negative relay is off, so the charging standard cannot be met. UTILITY MODEL CONTENT

[0005] The present application aims to solve at least one of the technical problems in the background art. To this end, one object of the present application is to provide a charging control circuit, a battery system and a power consumption device to solve the above problems.

[0006] An embodiment of the first aspect of the present application provides a battery charging control circuit, comprising: a main relay, a first end of the main relay being used to connect a battery, and a second end of the main relay being used to connect a charging device; a charging negative relay, a first end of the charging negative relay being used to connect a negative of the battery, and a second end of the charging negative relay being used to connect a negative of the charging device, the positive and negative of the battery being connected with the positive and negative of the charging device through the main relay and the charging negative relay, and a reference point being further provided between the first end of the charging negative relay and the negative of the battery; and a sampling circuit, connected with the first end and the second end of the charging negative relay, and configured to: during the period when the main relay is closed and the charging negative relay is off, connect the first end and the second end of the charging negative relay to form a first sampling loop, and collect a first voltage of the two ends of the charging negative relay relative to the reference point in the first sampling loop.

[0007] In the technical solution of the embodiment of the application, the sampling circuit is connected between the first end and the second end of the charging negative relay. During the closing of the main relay and the turning off of the charging negative relay, the sampling circuit can replace the charging negative relay to connect the negative pole of the battery and the negative pole of the charging device, so that the first sampling loop formed can connect the positive pole and the negative pole of the battery with the positive pole and the negative pole of the charging device respectively.

[0008] The reference point is arranged between the first end of the charging negative relay and the negative pole of the battery. In the first sampling loop, the negative pole of the battery is connected with the reference point, and the first end and the second end of the charging negative relay are connected between the positive pole of the battery and the reference point after being connected in series with the charging device, which is equivalent to that the two ends of the charging negative relay after being connected in series and the charging device are connected in parallel with the battery. In this way, the total voltage of the two ends of the charging negative relay after being connected in series and the charging device relative to the reference point is equal to the voltage of the two ends of the battery relative to the reference point. Since the sampling circuit can also collect the first voltage of the two ends of the charging negative relay relative to the reference point, in the case that the voltage of the two ends of the battery relative to the reference point is known, the output voltage of the charging device can be calculated by subtracting the first voltage from the voltage of the two ends of the battery relative to the reference point, thereby meeting the charging standard.

[0009] In some embodiments, the sampling circuit comprises a first resistance module and a first switch connected in series with the first resistance module. The first resistance module and the first switch connected in series are connected between the first end and the second end of the charging negative relay. The sampling circuit is configured to control the first switch to be closed to form the first sampling loop during the closing of the main relay and the turning off of the charging negative relay. When it is necessary to detect the output voltage of the charging device, the first switch is controlled to be closed, so that the first resistance module replaces the charging negative relay to connect the negative pole of the battery and the negative pole of the charging device, and the voltage across the first resistance module is sampled to obtain the first voltage, and then the output voltage of the charging device is calculated. In the case that the difference between the output voltage of the charging device and the voltage across the battery is less than a preset value, the charging negative relay is closed again, which can to some extent avoid the problem that the charging negative relay is stuck when the charging negative relay is directly closed when the difference between the output voltage of the charging device and the voltage across the battery is too large. In the case that the charging negative relay is closed to form the charging loop of the battery, the first switch is controlled to be opened, so as not to affect the charging of the battery.

[0010] In some embodiments, the first resistance module comprises: a first resistance element and a second resistance element connected in series, one end of the first resistance element away from the second resistance element is connected to the first end of the charging negative relay, and one end of the second resistance element away from the first resistance element is connected to the second end of the charging negative relay; wherein a node between the first resistance element and the second resistance element is used as a sampling point of the sampling circuit in the first sampling loop. By arranging the first resistance element and the second resistance element in series, and collecting the voltage of the sampling point relative to the reference point, the voltage value of the first resistance element in the first sampling loop can be obtained, and then the first voltage can be obtained based on the voltage value of the first resistance element in the first sampling loop and the resistance values of the first resistance element and the second resistance element, so that the first resistance element can have a good voltage dividing effect and improve the precision of the collected first voltage.

[0011] In some embodiments, the sampling circuit further comprises: a second resistance module, a first end of the second resistance module is connected to the node between the first resistance element and the second resistance element, and a second end of the second resistance module is connected to the bias voltage. The first end of the second resistance module is connected to the node between the first resistance element and the second resistance element, according to Kirchhoff's law, the sum of the current flowing through the node by the second resistance element and the current flowing through the node by the second resistance module is equal to the current flowing through the node by the first resistance element, based on which, in the case of known bias voltage, second sampling voltage, resistance value of the first resistance element, resistance value of the second resistance element and resistance value of the second resistance module, the first voltage can be calculated in combination with Ohm's law, and by this calculation method, even if the first voltage is negative, it can also be collected, thereby increasing the sampling range of the sampling circuit for the first voltage.

[0012] In some embodiments, the battery charging control circuit further comprises: a switch circuit, a first end of the switch circuit being connected to a positive pole of the charging device, and a second end of the switch circuit being connected to a first end of the charging negative relay; the switch circuit is configured to connect the charging device and the sampling circuit to form a second sampling loop connected between the positive pole and the negative pole of the charging device during the main relay and the charging negative relay are both off; and the sampling circuit is further configured to collect a second voltage of the charging negative relay relative to a reference point in the second sampling loop. In the charging process, the main relay is closed to connect the battery to external elements to charge the high voltage on the vehicle. When the main relay is off, the first end of the charging negative relay is disconnected from the battery, and the actual voltage of the first end of the charging negative relay is 0V. However, the actual voltage of the second end of the charging negative relay is greater than 0V due to the direct connection to the charging device. Therefore, the voltage of the second end of the charging negative relay is greater than the voltage of the first end of the charging negative relay when the charging negative relay is off. However, if the charging negative relay is stuck, the voltage of the first end of the charging negative relay will be the same as the voltage of the second end of the charging negative relay. Based on this, the switch circuit and the sampling circuit are configured to form the second sampling loop, so that the actual voltage of the charging negative relay during the main relay and the charging negative relay are both off can be obtained, and whether the charging negative relay is stuck before the charging device charges the battery can be determined.

[0013] In some embodiments, the switch circuit comprises: a third resistance module; and a second switch connected in series with the third resistance module, the third resistance module and the second switch being connected to the positive pole of the charging device and the first end of the charging negative relay in series; the switch circuit is configured to control the second switch to be closed during the main relay and the charging negative relay are both off; and the sampling circuit is configured to connect the first end and the second end of the charging negative relay to form the second sampling loop with the switch circuit during the main relay and the charging negative relay are both off. The third resistance module is provided in the switch circuit, so that the third resistance module can play a role in voltage division in the second sampling loop. Even if the charging negative relay is stuck, a large current will not be generated in the second sampling loop, the safety of detection is improved, and the sampling circuit is protected from being damaged by excessive current.

[0014] In some embodiments, the sampling circuit comprises: a first resistance module comprising: a first resistance element and a second resistance element connected in series, wherein the first resistance element is connected to the first end of the charging negative relay, and the second resistance element is connected to the second end of the charging negative relay; a first switch connected in series with the first resistance element and the second resistance element; a second resistance module, the first end of the second resistance module is connected to a node between the first resistance element and the second resistance element, and the second end of the second resistance module is connected to the bias voltage; the sampling circuit is configured to: during the period when the main relay and the charging negative relay are both turned off, close the first switch to form a second sampling loop together with the switching circuit, wherein the node between the first resistance element and the second resistance element serves as a sampling point of the sampling circuit in the second sampling loop. By setting the first resistance module and the second resistance module, even if the actual voltage across the charging negative relay relative to the reference point is negative, it can still be collected, thereby improving the accuracy of detecting whether the charging negative relay is stuck.

[0015] In some embodiments, the battery charging control circuit further comprises: a pre-charge capacitor connected in parallel between the positive electrode and the negative electrode of the battery, wherein the second end of the main relay is also connected to the pre-charge capacitor, and the first end of the charging negative relay is also connected to the pre-charge capacitor. The pre-charge capacitor serves to stabilize the charging voltage and protect the circuit from the impact of high voltage output by the charging device. In the embodiments of the present application, the first voltage across the charging negative relay in the first sampling loop is collected by the sampling circuit, and the output voltage of the charging pile is calculated based on the first voltage, so that whether to close the charging negative relay can be determined based on the difference between the output voltage of the charging pile and the voltage across the battery, which can to some extent avoid the problem of the charging negative relay sticking caused by the charging device instantaneously charging the pre-charge capacitor with a large current when the difference between the output voltage of the charging device and the voltage across the battery is too large.

[0016] In some embodiments, the battery charging control circuit further comprises: a pre-charge control circuit connected in parallel across the main relay, and the pre-charge control circuit is configured to control the pre-charge capacitor to be connected in series with the battery to form a pre-charge loop during the period when the main relay is disconnected from the pre-charge capacitor. By forming the pre-charge loop through the pre-charge control circuit, the pre-charge capacitor can be pre-charged, which to some extent avoids the problem of damaging other elements in the circuit caused by charging the pre-charge capacitor with a large current when the charging pile is connected to the battery.

[0017] In some embodiments, the first end of the pre-charge capacitor is configured to be connected to the positive pole of the battery, the second end of the pre-charge capacitor is configured to be connected to the negative pole of the battery, the first end of the charging negative relay is connected to the second end of the pre-charge capacitor; the main relay is a main positive relay, the first end of the main positive relay is configured to be connected to the positive pole of the battery, and the second end of the main positive relay is connected to the first end of the pre-charge capacitor. By arranging only a single-side main positive relay, the circuit can be simplified and the cost can be reduced while controlling the formation of a loop between the positive pole and the negative pole of the battery and other elements.

[0018] In some embodiments, the first end of the pre-charge capacitor is configured to be connected to the positive pole of the battery, the second end of the pre-charge capacitor is configured to be connected to the negative pole of the battery, the first end of the charging negative relay is connected to the second end of the pre-charge capacitor; the main relay is a main negative relay, the first end of the main negative relay is configured to be connected to the negative pole of the battery, and the second end of the main negative relay is connected to the second end of the pre-charge capacitor. By arranging only a single-side main negative relay, the circuit can be simplified and the cost can be reduced while controlling the formation of a loop between the positive pole and the negative pole of the battery and other elements.

[0019] In some embodiments, the first end of the pre-charge capacitor is configured to be connected to the positive pole of the battery, the second end of the pre-charge capacitor is configured to be connected to the negative pole of the battery, the first end of the charging negative relay is connected to the second end of the pre-charge capacitor; the main relay includes a main positive relay and a main negative relay, the first end of the main positive relay is configured to be connected to the positive pole of the battery, and the second end of the main positive relay is connected to the first end of the pre-charge capacitor, the first end of the main negative relay is configured to be connected to the negative pole of the battery, and the second end of the main negative relay is connected to the second end of the pre-charge capacitor. By arranging the double-side main positive relay and the main negative relay, the connection between the positive pole of the battery and other elements and the connection between the negative pole of the battery and other elements can be controlled, and the control ability of the formation of a loop between the positive pole and the negative pole of the battery and other elements can be improved.

[0020] Embodiments of the second aspect of the present application provide a battery system, including a battery; and the battery charging control circuit in the above embodiments.

[0021] Embodiments of the third aspect of the present application provide a power consumption device, including the battery system in the above embodiments, and the battery system is configured to provide electric energy.

[0022] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0023] In the drawings, identical or similar components or elements are denoted by the same reference signs throughout the several views, unless otherwise specified. The drawings are not necessarily to scale. It is to be understood that the drawings only depict some embodiments in accordance with the present disclosure and should not be considered as limiting the scope of the present application.

[0024] Figure 1 Structure diagram of a vehicle for some embodiments of the present application;

[0025] Figure 2 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0026] Figure 3 Equivalent circuit diagram of a first sampling loop for some embodiments of the present application;

[0027] Figure 4 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0028] Figure 5 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0029] Figure 6 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0030] Figure 7 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0031] Figure 8 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0032] Figure 9 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0033] Figure 10 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0034] Figure 11 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0035] Figure 12 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0036] Figure 13 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0037] Figure 14 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0038] Figure 15 Structure diagram of a battery charging control circuit for some embodiments of the present application;

[0039] Figure 16 Fig. 14 is a schematic diagram of a structure of a battery charging control circuit according to some embodiments of the present application.

[0040] Explanation of Reference Signs:

[0041] Vehicle 1000, power supply module 1021, first resistance module 1041, second resistance module 1042;

[0042] Battery 100, main relay 101, charging device 102, charging negative relay 103, sampling circuit 104, switching circuit 105;

[0043] Vehicle controller 200;

[0044] Motor 300;

[0045] Positive relay 31, negative relay 32;

[0046] Charging pre-charge capacitor C1, pre-charge capacitor C2, reference point G0, main positive relay K11, main negative relay K12, pre-charge relay K21, first end P1 of the charging negative relay, second end P2 of the charging negative relay, first resistance element R1, second resistance element R2, third resistance element R3, fourth resistance element R4, pre-charge resistance R5, first switch S1, second switch S2. DETAILED DESCRIPTION

[0047] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0050] Reference to an "embodiment" in this document means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of the application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after it.

[0052] In the description of the embodiments of the application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0053] In the charging process of some charging devices (such as charging piles) at present, the output voltage of the charging device needs to be detected first, and only when the difference between the output voltage of the charging device and the voltage across the battery is less than a certain preset value, the charging relay is closed to form a charging loop for the battery.

[0054] For example, for the European charging process, after the battery is physically connected to the European charging pile, the pile end positive relay and the pile end negative relay inside the charging pile will first be closed to form a direct current power supply loop of the charging pile and output a voltage for charging.

[0055] Then, the BMS (Battery Management System) of the vehicle interacts with the charging pile to enter a handshake phase. After the handshake is successful, the BMS controls the main relay to be closed to apply high voltage to the whole vehicle. During the application of high voltage to the whole vehicle, the charging relay is not closed.

[0056] After the application of high voltage to the whole vehicle is completed, the BMS needs to detect the output voltage of the charging pile and determine whether the difference between the output voltage of the charging pile and the voltage across the battery is less than a preset value. If the difference between the output voltage of the charging pile and the voltage across the battery is less than the preset value, the BMS controls the charging relay to be closed to form a charging loop for the battery by the charging pile.

[0057] However, in order to reduce the cost, the charging positive relay is omitted in the related art, and only a charging negative relay is designed to control the formation of the charging circuit, and the charging negative relay is connected to the negative electrode of the battery and the negative electrode of the charging device. It can be understood that, since the charging negative relay is connected to the low-potential negative electrode of the battery and the low-potential negative electrode of the charging device, when the charging negative relay is disconnected, the output voltage of the charging device cannot be accurately represented by detecting the voltage across the charging negative relay, and thus the output voltage of the charging device is difficult to obtain.

[0058] Based on the above considerations, a sampling circuit is arranged to connect the first end and the second end of the charging negative relay. During the closing of the main relay and the disconnection of the charging negative relay, the sampling circuit can replace the charging negative relay to connect the negative electrode of the battery and the negative electrode of the charging device, so that the first sampling circuit formed can connect the positive electrode and the negative electrode of the battery to the positive electrode and the negative electrode of the charging device, respectively.

[0059] The reference point is arranged between the first end of the charging negative relay and the negative electrode of the battery. In the first sampling circuit, the negative electrode of the battery is connected to the reference point, and the first end and the second end of the charging negative relay are connected between the positive electrode of the battery and the reference point after being connected in series with the charging device, which is equivalent to that the two ends of the charging negative relay and the charging device are connected in parallel with the battery. In this way, the total voltage of the two ends of the charging negative relay and the charging device relative to the reference point is equal to the voltage across the battery relative to the reference point. Since the sampling circuit can also collect the first voltage across the two ends of the charging negative relay relative to the reference point, in the case where the voltage across the battery relative to the reference point is known, the output voltage of the charging device can be calculated by subtracting the first voltage from the voltage across the battery relative to the reference point, thereby meeting the charging standard.

[0060] The battery charging control circuit disclosed in the embodiments of the present application can be used in the charging of the battery in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto.

[0061] The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0062] The following embodiments are described with reference to a vehicle 1000 as an example of an electric device in an embodiment of the present application for the convenience of description.

[0063] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a vehicle controller 200 and a motor 300, and the vehicle controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0064] In some embodiments of the present application, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0065] Reference Figure 2 The embodiments of the present application provide a battery charging control circuit, which includes: a main relay 101, a first end of the main relay 101 being used for connecting the battery 100, and a second end of the main relay 101 being used for connecting a charging device 102; a charging negative relay 103, a first end P1 of the charging negative relay being used for connecting a negative electrode of the battery 100, and a second end P2 of the charging negative relay being used for connecting a negative electrode of the charging device 102, the positive electrode and the negative electrode of the battery 100 being connected with the positive electrode and the negative electrode of the charging device 102 through the main relay 101 and the charging negative relay 103, and a reference point G0 being further arranged between the first end P1 of the charging negative relay and the negative electrode of the battery 100; and a sampling circuit 104, which is connected with the first end and the second end of the charging negative relay and is configured to: during the main relay 101 being closed and the charging negative relay 103 being turned off, connect the first end and the second end of the charging negative relay to form a first sampling loop, and collect a first voltage of two ends of the charging negative relay 103 in the first sampling loop relative to the reference point G0.

[0066] The charging device 102 can include but is not limited to a charging pile and other devices capable of supplying power to the battery 100, and the charging device 102 can include a power supply module 1021, which can convert alternating current into direct current to supply power to the battery 100 and adjust the output voltage and current, and the positive electrode of the charging device 102 can be the positive electrode of the power supply module 1021, and the negative electrode of the charging device 102 can be the negative electrode of the power supply module 1021. The power supply module 1021 can be a structure for providing voltage and current which is well known to those skilled in the art.

[0067] The charging device 102 can further include a positive relay 31 connected to the positive pole of the power supply module 1021 and a negative relay 32 connected to the negative pole of the power supply module 1021. After the charging device 102 is physically connected to the battery 100, the positive relay 31 and the negative relay 32 are first closed to form a direct current power supply loop of the charging device 102 to output a voltage for charging. The main relay 101 can be used to connect with the positive relay 31 and / or the negative relay 32, and the charging negative relay 103 can be used to connect with the negative relay 32. In the case that the positive relay 31 and the negative relay 32 of the charging device 102 are closed, the positive pole and the negative pole of the battery 100 can be connected to the positive pole and the negative pole of the charging device 102 through the main relay 101 and the charging negative relay 103, respectively.

[0068] In some embodiments, the charging device 102 can include a charging pre-charge capacitor C1 connected in parallel between the positive pole and the negative pole of the power supply module 1021 to serve as a voltage stabilizer.

[0069] In some embodiments, the charging device 102 is a charging pile.

[0070] The reference point G0 refers to a potential reference point G0, and the potential of the reference point G0 is defined as zero.

[0071] It can be understood that, in the case that the main relay 101 is closed, the main relay 101 can connect the battery 100 to external elements to charge the high voltage on the whole vehicle. During this period, in order to avoid the output voltage of the charging device 102 being too different from the voltage value between the battery 100 to damage the charging negative relay 103, the charging negative relay 103 remains in an off state. The main relay 101 can include at least one of a main positive relay and a main negative relay, and the closing of the main relay 101 refers to the closing of all relays included in the main relay 101 (the main positive relay and / or the main negative relay).

[0072] The main relay 101 can include at least one of a main positive relay K11 and a main negative relay. The first end of the main positive relay K11 is used to connect the positive pole of the battery 100, and the second end of the main positive relay K11 is used to connect the positive pole of the charging device 102. The first end of the main negative relay is used to connect the negative pole of the battery 100, and the second end of the main negative relay is used to connect the negative pole of the charging device 102. In the case that the main relay 101 is the main positive relay K11, the first end P1 of the charging negative relay is directly connected to the negative pole of the battery 100. In the case that the main relay 101 is the main negative relay, the positive pole of the battery 100 is directly connected to the positive pole of the charging device 102. The first end P1 of the charging negative relay is connected to the second end of the main negative relay. As an example, Figure 2The main relay 101 is a main positive relay K11 in the example shown in FIG. 1.

[0073] It is worth noting that only one charging negative relay 103 is provided in the example of the present application. In the case where the main relay 101 comprises a main positive relay K11, the first end of the main positive relay K11 is used to directly connect the positive pole of the battery 100, and the second end of the main positive relay K11 is used to directly connect the positive pole of the charging device 102. In the case where the main relay 101 comprises a main negative relay, the first end of the main negative relay is used to directly connect the negative pole of the battery 100, and the second end of the main negative relay is connected to the first end P1 of the charging negative relay, and the second end P2 of the charging negative relay is used to directly connect the negative pole of the charging device 102.

[0074] The connection of the positive and negative poles of the battery 100 to the positive and negative poles of the charging device 102 through the main relay 101 and the charging negative relay 103 means that, in the case where the main relay 101 and the charging negative relay 103 are both closed, the positive pole of the battery 100 is connected to the positive pole of the charging device 102, and the negative pole of the battery 100 is connected to the negative pole of the charging device 102.

[0075] The connection of the positive and negative poles of the battery 100 to the positive and negative poles of the charging device 102 through the main relay 101 and the charging negative relay 103 means that, in the case where the main relay 101 and the charging negative relay 103 are both closed, the positive pole of the battery 100 is connected to the positive pole of the charging device 102, and the negative pole of the battery 100 is connected to the negative pole of the charging device 102.

[0076] The reference point G0 is arranged between the first end P1 of the charging negative relay and the negative pole of the battery 100, so that, in the first sampling loop, the negative pole of the battery 100 is connected to the reference point G0, the positive pole of the charging device 102 is connected to the positive pole of the battery 100, the negative pole of the charging device 102 is connected to the reference point G0 through the sampling circuit 104, and since the sampling circuit 104 connects the first end P1 of the charging negative relay and the second end P2 of the charging negative relay, it is equivalent to connecting the first end P1 of the charging negative relay and the second end P2 of the charging negative relay in series with the charging device 102 and then connecting them between the positive pole of the battery 100 and the reference point G0, i.e., connecting the first end and the second end of the charging negative relay and the charging device 102 in parallel with the battery 100. As shown in FIG. 1, Figure 3 Figure 3 An equivalent circuit diagram of the first sampling loop is shown in FIG. 2.

[0077] ​Therefore, the sum of the voltage across the charging negative relay 103 relative to the reference point G0 and the output voltage of the charging device 102 relative to the reference point G0 is equal to the voltage across the battery 100 relative to the reference point G0. Since the sampling circuit 104 is also capable of collecting the first voltage across the charging negative relay 103 relative to the reference point G0, in the case where the voltage across the battery 100 relative to the reference point G0 is known, the output voltage of the charging device 102 can be calculated by subtracting the first voltage from the voltage across the battery 100 relative to the reference point G0.

[0078] The voltage across the charging negative relay 103 can be the difference between the voltage of the second end P2 of the charging negative relay relative to the reference point G0 and the voltage of the first end P1 of the charging negative relay relative to the reference point G0.

[0079] In some embodiments, the voltage across the battery 100 can be obtained by a voltage sensor.

[0080] In other embodiments, the voltage across the battery 100 can be obtained by a BMS of the battery 100. The BMS can include an integrated chip for obtaining the voltage value of the battery 100, and a pin of the integrated chip is connected to the battery 100 to calculate the voltage value across the battery 100.

[0081] In the above technical solution, the reference point G0 is arranged between the first end P1 of the charging negative relay and the negative electrode of the battery 100, and the sampling circuit 104 is connected to the first end and the second end of the charging negative relay, so that during the closing of the main relay 101 and the turning off of the charging negative relay 103, the sampling circuit 104 can replace the charging negative relay 103 to connect the negative electrode of the battery 100 and the negative electrode of the charging device 102, forming a first sampling loop, and the first end and the second end of the charging negative relay are both connected in the first sampling loop. In the first sampling loop, the first end and the second end of the charging negative relay are connected between the positive electrode of the battery 100 and the reference point G0 in series with the charging device 102, and the sampling circuit 104 is further used to collect the first voltage across the charging negative relay 103 in the first sampling loop. In the case where the voltage across the battery 100 is known, the output voltage of the charging device 102 can be obtained by subtracting the first voltage from the voltage across the battery 100, thereby meeting the charging standard.

[0082] Reference Figure 4According to some embodiments of the present application, the sampling circuit 104 comprises a first resistance module 1041; a first switch S1 connected in series with the first resistance module 1041, the first resistance module 1041 and the first switch S1 connected in series are connected between the first end and the second end of the charging negative relay, and the sampling circuit 104 is configured to: during the closing of the main relay 101 and the turning off of the charging negative relay 103, control the first switch S1 to be closed to form a first sampling loop.

[0083] The sampling circuit can collect a first sampling voltage of both ends of the first resistance module 1041 relative to the reference point G0 in the first sampling loop as a first voltage.

[0084] In the first sampling loop, the first resistance module 1041 and the first switch S1 connected in series are connected between the reference point G0 and the negative electrode of the charging device 102, the positive electrode of the charging device 102 is connected with the positive electrode of the battery 100, and the negative electrode of the battery 100 is connected with the reference point G0, that is, the first resistance module 1041 is connected in series with the charging device 102 and is connected in parallel with the battery 100.

[0085] Both ends of the first resistance module 1041 are electrically connected with the first end and the second end of the charging negative relay respectively, so that the first sampling voltage of both ends of the first resistance module 1041 relative to the reference point G0 is the first voltage of both ends of the charging negative relay 103 relative to the reference point G0.

[0086] It can be understood that the sampling circuit 104 is also configured to: during the closing of the main relay 101 and the charging negative relay 103, control the first switch S1 to be turned off, so as not to affect the charging of the battery 100.

[0087] In some embodiments, the sampling circuit 104 can be controlled by the BMS of the battery 100, including controlling the turning off of the first switch S1 of the sampling circuit 104 and controlling the sampling of the sampling circuit 104.

[0088] In some embodiments, the first switch S1 can include but is not limited to a switching element such as a relay.

[0089] In some embodiments, the first resistance module 1041 can only include one resistance element. In other embodiments, the first resistance module 1041 can also include a resistance string, and the resistance string includes a plurality of resistance elements connected in series.

[0090] In some embodiments, the sampling circuit 104 further comprises an ADC (Analog to Digital Converter) sampling device, which can be connected to the first resistance module 1041 to collect a first sampling voltage between the first resistance module 1041 and the reference point G0. The ADC sampling device has the same meaning as generally understood by a person skilled in the art belonging to the embodiments of the present application, and the structure and principle of the ADC sampling device will not be described here.

[0091] In the above technical solution, when it is necessary to detect the output voltage of the charging device 102, the first switch S1 is controlled to be closed, so that the first resistance module 1041 replaces the charging negative relay 103 to connect the negative electrode of the battery 100 and the negative electrode of the charging device 102, and the first voltage is obtained by sampling the voltage between the first resistance module 1041, and then the output voltage of the charging device 102 is calculated. In the case where the difference between the output voltage of the charging device 102 and the voltage between the battery 100 is less than a preset value, the charging negative relay 103 is closed again, which can to some extent avoid the problem of sticking of the charging negative relay 103 caused by directly closing the charging negative relay 103 when the difference between the output voltage of the charging device 102 and the voltage between the battery 100 is too large. In the case where the charging negative relay 103 is closed to form a charging circuit for the battery 100, the first switch S1 is controlled to be opened, so as not to affect the charging of the battery 100.

[0092] Reference Figure 5 According to some embodiments of the present application, the first resistance module 1041 comprises: a first resistance element R1 and a second resistance element R2 connected in series, one end of the first resistance element R1 away from the second resistance element R2 is connected to the first end P1 of the charging negative relay, and one end of the second resistance element R2 away from the first resistance element R1 is connected to the second end P2 of the charging negative relay; wherein the node between the first resistance element R1 and the second resistance element R2 serves as a sampling point in the first sampling circuit of the sampling circuit 104.

[0093] The sampling circuit 104 can collect the voltage value of the sampling point relative to the reference point to collect the voltage value of the first resistance element R1 relative to the reference point G0 in the first sampling circuit. In this way, the first sampling voltage can be obtained based on the voltage value of the first resistance element R1 relative to the reference point G0, the resistance value of the first resistance element R1 and the resistance value of the second resistance element R2.

[0094] In some embodiments, the sampling circuit 104 comprises an ADC sampling device Figure 5When the ADC is marked as ADC, the ADC sampling device can be connected to the node between the first resistance element R1 and the second resistance element R2, taking the node as a sampling point, and collecting the voltage value of the two ends of the first resistance element R1 relative to the reference point G0.

[0095] By connecting the first resistance element R1 and the second resistance element R2 in series, the voltage across the battery 100 can be further divided into two parts across the first resistance element R1 and the second resistance element R2, so that the voltage collected by the sampling circuit 104 falls within the sampling range, and the sampling accuracy is improved.

[0096] In some embodiments, the resistance values of the first resistance element R1 and the second resistance element R2 can be equal.

[0097] In other embodiments, the resistance value of the first resistance element R1 can be greater than the resistance value of the second resistance element R2.

[0098] In some embodiments, the first resistance element R1 can include one resistance element. In other embodiments, the first resistance element R1 can also include a resistance string.

[0099] In some embodiments, the second resistance element R2 can include one resistance element. In other embodiments, the second resistance element R2 can also include a resistance string.

[0100] The first switch S1 can be connected between the first resistance element R1 and the second resistance element R2, or the first switch S1 can be connected to one end of the first resistance element R1 away from the second resistance element R2, or the first switch S1 can be connected to one end of the second resistance element R2 away from the first resistance element R1.

[0101] Since the first resistance element R1 and the second resistance element R2 are connected in series, based on Ohm's law, the sum of the voltages across the first resistance element R1 and the second resistance element R2 relative to the reference point G0 is equal to the first sampling voltage across the first resistance module 1041 relative to the reference point G0. The voltage across the first resistance element R1 is equal to the resistance value of the first resistance element R1 multiplied by the current flowing through the first resistance element R1, and the voltage across the second resistance element R2 is equal to the resistance value of the second resistance element R2 multiplied by the current flowing through the second resistance element R2. The current flowing through the first resistance element R1 is equal to the current flowing through the second resistance element R2. Based on this, the following formula (1) can be obtained:

[0102]

[0103] Wherein, U1 represents the first voltage, which is the first sampling voltage, Uad1 represents the voltage value of the two ends of the first resistance element R1 relative to the reference point G0, r1 represents the resistance value of the first resistance element R1, and r2 represents the resistance value of the second resistance element R2.

[0104] The voltage value of the two ends of the first resistance element R1 relative to the reference point G0, the resistance value of the first resistance element R1, and the resistance value of the second resistance element R2 are substituted into formula (1) to obtain the first voltage.

[0105] In some embodiments, the sampling circuit can include a calculation unit which is built-in with mathematical functions and instructions and is capable of performing the operation of formula (1) above to obtain the first voltage. The calculation unit can be any unit including computer programs capable of performing operations as known to those skilled in the art.

[0106] In the above technical solution, by setting the first resistance element R1 and the second resistance element R2 in series, and collecting the voltage value of the first resistance element R1 in the first sampling loop and the resistance values of the first resistance element R1 and the second resistance element R2 to obtain the first sampling voltage, the first resistance element R1 can play a good voltage dividing effect and improve the accuracy of the collected first sampling voltage.

[0107] Reference Figure 6 According to some embodiments of the present application, the sampling circuit 104 further includes a second resistance module 1042, the first end of the second resistance module 1042 is connected to the node between the first resistance element R1 and the second resistance element R2, and the second end of the second resistance module 1042 is connected to the bias voltage U2.

[0108] In the case of including the second resistance module, the sampling circuit 104 can collect the second sampling voltage of the sampling point relative to the reference point, so that the first voltage can be obtained based on the second sampling voltage, the bias voltage, the resistance value of the first resistance element R1, the resistance value of the second resistance element R2, and the resistance value of the second resistance module 1042.

[0109] In some embodiments, the sampling circuit 104 includes an ADC sampling device, and the second sampling voltage can be collected through the ADC sampling device.

[0110] According to Kirchhoff's law, the sum of the currents flowing into a node is equal to the sum of the currents flowing out of the node. For the node between the first resistance element R1 and the second resistance element R2, the second end of the second resistance module 1042 is connected to the bias voltage U2, the first end is connected to the node between the first resistance element R1 and the second resistance element R2, and the current flows into the node from the first end of the second resistance module 1042. The first end of the second resistance element R2 is connected to the charging device 102, and the second end is connected to the node between the first resistance element R1 and the second resistance element R2, and the current flows into the node from the second end of the second resistance element R2. The first end of the first resistance element R1 is connected to the node between the first resistance element R1 and the second resistance element R2, and the second end is connected to the reference point G0, and the current flows out of the node between the first resistance element R1 and the second resistance element R2 to the reference point G0.

[0111] Therefore, the sum of the current flowing through the node between the first resistance element R1 and the second resistance element R2 by the second resistance element R2 and the current flowing through the node between the first resistance element R1 and the second resistance element R2 by the second resistance module 1042 is equal to the current flowing through the node between the first resistance element R1 and the second resistance element R2 by the first resistance element R1, and the following formula (2) is obtained:

[0112]

[0113] wherein U1 represents the first voltage, U2 represents the bias voltage, Uad2 represents the second sampling voltage, r1 represents the resistance value of the first resistance element R1, r2 represents the resistance value of the second resistance element R2, and r3 represents the resistance value of the second resistance module 1042.

[0114] The above formula (2) can be transformed into the following formula (3), and the first voltage can be calculated based on the formula (3).

[0115]

[0116] It can be understood that due to the limitation of the sampling circuit 104 itself, the sampling voltage directly collected by the sampling circuit 104 is usually greater than or equal to 0V, for example, the sampling value of the ADC sampling device is greater than or equal to 0V. That is, the second sampling voltage is greater than or equal to 0V, and the voltage value Uad1 of the two ends of the first resistance element R1 relative to the reference point G0 collected in the above formula (1) is also greater than or equal to 0V.

[0117] Therefore, in the case where the second resistance module 1042 is not set, the first voltage value obtained based on the formula (1) is also a positive value greater than or equal to 0V.

[0118] In the case of setting the second resistance module 1042, even if the collected second sampling voltage Uad2 is 0V, the first voltage U1 can be calculated to be equal to That is, the negative first voltage can be obtained, and the maximum negative voltage that can be collected is

[0119] As described above, by setting the second resistance module 1042 and inputting the bias voltage at the first end of the second resistance module 1042, the negative first voltage can be obtained, and the collection range of the first voltage is increased.

[0120] In some embodiments, the bias voltage can be 5V.

[0121] In some embodiments, the sampling circuit can include a calculation unit, which is built-in with mathematical functions and instructions, and can perform the operation of the above formula (3) to obtain the first voltage. The calculation unit can be any unit including a computer program that can perform operations as known to those skilled in the art.

[0122] In the above technical solution, by setting the second resistance module 1042, even if the first voltage is negative, it can be collected, thereby increasing the sampling range of the sampling circuit 104 to the first voltage.

[0123] Reference Figure 7 According to some embodiments of the present application, the battery charging control circuit further comprises: a switching circuit 105, a first end of the switching circuit 105 is used to connect the positive pole of the charging device 102, and the second end is connected to the first end P1 of the charging negative relay; the switching circuit 105 is configured to: during the off period of the main relay 101 and the charging negative relay 103, connect the charging device 102 and the sampling circuit 104 to form a second sampling loop together with the sampling circuit 104, which is connected between the positive pole and the negative pole of the charging device 102, and the sampling circuit 104 is further configured to: collect the second voltage of the charging negative relay 103 in the second sampling loop relative to the reference point G0.

[0124] In the charging process, the main relay 101 is closed to connect the battery 100 to the external element to charge the high voltage on the whole vehicle. When the main relay 101 is disconnected, the battery 100 is disconnected from the first end P1 of the charging negative relay, and the actual voltage of the first end P1 of the charging negative relay is 0V. The second end P2 of the charging negative relay is directly connected to the charging device 102, and in the case that the output voltage of the charging device 102 is large, the actual voltage of the second end P2 of the charging negative relay should be greater than 0V. Therefore, in the case that the charging negative relay 103 is disconnected, the voltage of the second end P2 of the charging negative relay is greater than the voltage of the first end P1 of the charging negative relay, that is, the voltage across the charging negative relay 103 is greater than 0V or less than 0V. If the charging negative relay 103 is stuck, the voltage of the first end of the charging negative relay 103 will be the same as the voltage of the second end, that is, the voltage across the charging negative relay 103 is equal to 0V.

[0125] However, in the case that the charging negative relay 103 is disconnected and does not form a loop with the charging pile, the voltages of the first end and the second end of the charging negative relay are both low potentials, and the voltage across the charging negative relay 103 is directly detected as 0V.

[0126] Based on this, the embodiment of the present application sets a switching circuit 105, which can connect the positive electrode of the charging device 102 and the first end P1 of the charging negative relay, so that the charging device 102 is connected to the sampling circuit 104. In the case that the sampling circuit 104 connects the first end and the second end of the charging negative relay, the positive electrode of the charging device 102 can be connected to the negative electrode of the charging device 102 through the switching circuit 105 and the sampling circuit 104 to form a second sampling loop. That is, the sampling circuit 104 replaces the charging negative relay 103 to connect the first end and the second end of the charging negative relay, so that the output voltage of the charging device 102 can be divided between the first end and the second end of the charging negative relay, and the second voltage of the charging negative relay 103 in the second sampling loop relative to the reference point G0 can be collected as the true voltage across the charging negative relay 103. If the second voltage is greater than 0V or less than 0V, it indicates that the charging negative relay 103 does not stick. If the second voltage is equal to 0V, it indicates that the charging negative relay 103 is stuck.

[0127] In the above technical solution, the switching circuit 105 and the sampling circuit 104 form a second sampling circuit 104, which can obtain the true voltage across the charging negative relay 103 during the disconnection of the main relay 101 and the charging negative relay 103, and further determine whether the charging negative relay 103 has been stuck before the charging device 102 charges the battery 100.

[0128] Reference Figure 8According to some embodiments of the present application, the switch circuit 105 comprises a third resistance module; a second switch S2 connected in series with the third resistance module, and the third resistance module and the second switch S2 connected in series are connected to the positive pole of the charging device 102 and the first end P1 of the charging negative relay; the switch circuit 105 is configured to control the second switch S2 to be closed during the off state of the main relay 101 and the charging negative relay 103; and the sampling circuit 104 is configured to connect the first end and the second end of the charging negative relay to form a second sampling loop together with the switch circuit 105 during the off state of the main relay 101 and the charging negative relay 103.

[0129] The sampling circuit 104 connects the first end and the second end of the charging negative relay so that the negative pole of the charging device 102 is connected to the first end P1 of the charging negative relay, and the second switch S2 is closed so that the third resistance module is connected to the positive pole of the charging device 102 and the first end P1 of the charging negative relay, and then the charging device 102, the third resistance module, the first end and the second end of the charging negative relay, and the sampling circuit 104 are connected in series in the second sampling loop. In the second sampling loop, the current flows out from the positive pole of the charging device 102, and then flows through the third resistance module, the first end P1 of the charging negative relay, the sampling circuit 104, the second end P2 of the charging negative relay, and then flows into the negative pole of the charging device 102. In the case of forming the second sampling loop, the output voltage of the charging device 102 can be divided to the sampling circuit 104, so that the sampling circuit 104 can detect that a potential difference can be formed between the first end and the second end of the charging negative relay, and then the real voltage of the charging negative relay 103 relative to the reference point G0 can be collected. As shown in FIG. 4, Figure 7 Figure 7 The solid line with an arrow in the middle shows the current path in the second sampling loop.

[0130] In some embodiments, the off state of the second switch S2 can be controlled by the BMS of the battery 100.

[0131] In some embodiments, the third resistance module can comprise a third resistance element R3 and a fourth resistance element R4 connected in series, and the second switch S2 can be connected between the third resistance element R3 and the fourth resistance element R4, or connected to one end of the third resistance element R3 away from the fourth resistance element R4, or connected to one end of the fourth resistance element R4 away from the third resistance element R3.

[0132] In some embodiments, the resistance values of the third resistance element R3 and the fourth resistance element R4 can be equal.

[0133] In some embodiments, the third resistance element R3 can comprise one resistance element. In other embodiments, the third resistance element R3 can also comprise a resistance string.

[0134] ​In some embodiments, the fourth resistance element R4 can include one resistance element. In other embodiments, the fourth resistance element R4 can also include a resistance string.

[0135] In the technical solution, the switch circuit 105 includes the third resistance module, so that the third resistance module can play a role in voltage division in the second sampling loop. Even if the charging negative relay 103 is stuck, no large current will be generated in the second sampling loop, improving the safety of detection and protecting the sampling circuit 104 from being damaged by excessive current.

[0136] Reference Figure 8 According to some embodiments of the present application, the sampling circuit 104 includes: a first resistance module 1041, the first resistance module 1041 including: a first resistance element R1 and a second resistance element R2 connected in series, wherein the first resistance element R1 is connected to the first end P1 of the charging negative relay, and the second resistance element R2 is connected to the second end P2 of the charging negative relay; a first switch S1 connected in series with the first resistance element R1 and the second resistance element R2; a second resistance module 1042, the first end of the second resistance module 1042 being connected to a node between the first resistance element R1 and the second resistance element R2, and the second end of the second resistance module 1042 being connected to a bias voltage; the sampling circuit 104 is configured to: during the main relay 101 and the charging negative relay 103 are both off, the first switch S1 is closed to form a second sampling loop together with the switch circuit 105, wherein the node between the first resistance element R1 and the second resistance element R2 serves as a sampling point of the sampling circuit 104 in the second sampling loop.

[0137] The sampling circuit can collect a third sampling voltage of the node between the first resistance element R1 and the second resistance element R2 relative to the reference point G0 in the second sampling loop, so that the second voltage can be obtained based on the third sampling voltage, the bias voltage, the resistance value of the first resistance element R1, the resistance value of the second resistance element R2, and the resistance value of the second resistance module 1042.

[0138] The structure of the first switch S1, the first resistance module 1041, and the second resistance module 1042 can be referred to the related description of the above embodiments, which will not be repeated here. It is worth noting that during the main relay 101 is closed and the charging negative relay 103 is off, the first switch S1 can be controlled to be closed to form a first sampling loop, and the first switch S1, the first resistance module 1041, and the second resistance module 1042 can be used to collect the first voltage.

[0139] During the off state of the main relay 101 and the charging negative relay 103, the first switch S1 and the second switch S2 can be controlled to be closed, forming a second sampling loop, and the first resistor element R1 and the second resistor element R2 are connected between the first end and the second end of the charging negative relay, replacing the charging negative relay 103 in series in the second sampling loop, and the second voltage is the sum of the voltages of the first resistor element R1 and the second resistor element R2 in the second sampling loop.

[0140] According to Kirchhoff's law, the sum of the current flowing through the node between the first resistor element R1 and the second resistor element R2 and the current flowing through the node between the first resistor element R1 and the second resistor element R2 of the second resistor module 1042 is equal to the current flowing through the node between the first resistor element R1 and the second resistor element R2 of the first resistor element R1. Therefore, in the case that the sampling circuit 104 collects the third sampling voltage of the node between the first resistor element R1 and the second resistor element R2, the second voltage can be obtained by the above formula (3). The relevant principles and methods can be referred to the relevant description of the above embodiments, and the difference is only that the third sampling voltage is obtained in the case of forming the second sampling loop, and the second sampling voltage is obtained in the case of forming the first sampling loop.

[0141] It can be understood that in the second sampling loop, the first resistor module 1041 and the third resistor module are connected in series, and the current flows from the positive electrode of the charging device 102 to the third resistor module and then to the first resistor module 1041. Since the third resistor module is connected to the first end P1 of the charging negative relay, and the first end P1 of the charging negative relay is connected to the reference point G0, the current in the second sampling loop flows from the reference point G0 to the first resistor module 1041. Therefore, the voltage of the charging negative relay 103 relative to the reference point G0 is negative, wherein the theoretical voltage of the charging negative relay 103 relative to the reference point G0 should be -U0xA3 / A1, U0 represents the output voltage of the charging pile, A1 represents the resistance value of the first resistor module 1041, and A3 represents the resistance value of the third resistor module.

[0142] And the first resistor module 1041 and the second resistor module 1042 are arranged, and the first end of the second resistor module 1042 inputs the bias voltage, so that the negative second voltage can be obtained, and the obtained second voltage can accurately represent the true voltage of the charging negative relay 103 relative to the reference point G0.

[0143] In some embodiments, the sampling circuit includes a calculation unit, and the calculation unit is configured to calculate the second voltage based on the third sampling voltage and the above formula (3).

[0144] In the technical solution, the first resistance module 1041 and the second resistance module 1042 are arranged, so that even if the actual voltage of the charging negative relay 103 relative to the reference point G0 is negative, the actual voltage can still be collected, thereby improving the accuracy of detecting whether the charging negative relay 103 is stuck.

[0145] Reference Figure 9 According to some embodiments of the present application, the battery charging control circuit further comprises a pre-charge capacitor C2, the pre-charge capacitor C2 is connected in parallel between the positive electrode and the negative electrode of the battery 100, wherein the second end of the main relay 101 is also connected to the pre-charge capacitor C2, and the first end P1 of the charging negative relay is also connected to the pre-charge capacitor C2.

[0146] Before the main relay 101 is closed, the pre-charge capacitor C2 can be charged, and in some embodiments, the pre-charge capacitor C2 can be charged to 80% of the voltage across the pre-charge capacitor C2 or equal to the voltage of the battery 100, so that when the battery 100 and the charging device 102 form a charging loop, a large current impact can be avoided.

[0147] After charging the pre-charge capacitor C2, the main relay 101 is closed again, and the high voltage step of the whole vehicle is performed. After the high voltage is completed, the first voltage across the charging negative relay 103 relative to the reference point G0 can be collected to obtain the output voltage of the charging device 102.

[0148] In some embodiments, the pre-charge capacitor C2 can be pre-charged by a DC / DC (Direct Current / Direct Current) reverse pre-charge device, which has the same meaning as understood by a person skilled in the art of the embodiments of the present application, and the structure of the DC / DC reverse pre-charge device and the principle of charging the pre-charge capacitor C2 will not be described here.

[0149] In the technical solution, the pre-charge capacitor C2 plays a role in stabilizing the charging voltage and protecting the circuit from the impact of the high voltage output by the charging device 102. By arranging the sampling circuit 104 to collect the first voltage across the charging negative relay 103 in the first sampling loop, and calculating the output voltage of the charging pile based on the first voltage, it can be determined whether to close the charging negative relay 103 based on the difference between the output voltage of the charging pile and the voltage across the battery 100, which can to some extent avoid the problem of the charging negative relay 103 sticking caused by the charging device 102 instantaneously charging the pre-charge capacitor C2 with a large current when the difference between the output voltage of the charging device 102 and the voltage across the battery 100 is too large.

[0150] Reference Figure 10According to some embodiments of the present application, the battery charging control circuit further comprises a pre-charge control circuit connected in parallel with the main relay 101, and the pre-charge control circuit is configured to control the pre-charge capacitor C2 to be connected in series with the battery 100 to form a pre-charge loop during the period when the main relay 101 disconnects the battery 100 from the pre-charge capacitor C2.

[0151] The pre-charge control circuit is connected in parallel with the main relay 101, so that the pre-charge control circuit can be connected to the battery 100 when the main relay 101 is disconnected from the battery 100.

[0152] For example, when the main relay 101 is the main positive relay K11, the pre-charge control circuit is connected in parallel with the main positive relay K11. When the main relay 101 is the main negative relay, the pre-charge control circuit is connected in parallel with the main negative relay. When the main relay 101 includes the main positive relay K11 and the main negative relay, the pre-charge control circuit is connected in parallel with the main positive relay K11. For example, Figure 10 Fig. 2 shows the pre-charge control circuit connected in parallel with the main positive relay K11 when the main relay 101 is the main positive relay K11.

[0153] In some embodiments, the pre-charge control circuit can include a pre-charge relay K21 and a pre-charge resistor R5 connected in series. Taking the main relay 101 as the main positive relay K11 as an example, the first end of the main positive relay K11 is used to connect the positive electrode of the battery 100, and the second end is connected to the first end of the pre-charge capacitor C2. The first end of the pre-charge relay K21 can be connected to the first end of the main positive relay K11, the second end of the pre-charge relay K21 can be connected to the first end of the pre-charge resistor R5, and the second end of the pre-charge resistor R5 can be connected to the second end of the main positive relay K11. The second end of the pre-charge capacitor C2 can be directly connected to the negative electrode of the battery 100.

[0154] During the disconnection of the main positive relay K11, the pre-charge relay K21 is closed, and the battery 100, the pre-charge resistor R5, and the pre-charge capacitor C2 are connected in series to form a pre-charge loop, so that the battery 100 charges the pre-charge capacitor C2. After the voltage across the pre-charge capacitor C2 is charged to the same voltage as the battery 100, the pre-charge relay K21 is opened and the main positive relay K11 is closed.

[0155] In the above technical solution, the pre-charge control circuit forms a pre-charge loop, which can pre-charge the pre-charge capacitor C2, and to some extent, avoid the problem of large current charging the pre-charge capacitor C2 when the charging pile is connected to the battery 100, which can cause damage to other elements in the circuit.

[0156] It can be understood that in other embodiments, the battery charging control circuit can also not include the pre-charge control circuit, but pre-charge the pre-charge capacitor C2 through the DC / DC reverse pre-charge device.

[0157] Reference Figure 9 to Figure 11 According to some embodiments of the present application, the first end of the pre-charge capacitor C2 is used to connect the positive electrode of the battery 100, the second end is used to connect the negative electrode of the battery 100, and the first end P1 of the charging negative relay is connected to the second end of the pre-charge capacitor C2; the main relay 101 is a main positive relay K11, and the first end of the main positive relay K11 is used to connect the positive electrode of the battery 100, and the second end of the main positive relay K11 is connected to the first end of the pre-charge capacitor C2.

[0158] That is, the main positive relay K11 is connected between the first end of the pre-charge capacitor C2 and the positive electrode of the battery 100, so that the first end of the pre-charge capacitor C2 is connected to the positive electrode of the battery 100 through the main positive relay K11. The second end of the pre-charge capacitor C2 is directly used to connect the negative electrode of the battery 100, and the reference point G0 is located between the second end of the pre-charge capacitor C2 and the negative electrode of the battery 100. The charging negative relay 103 is connected between the second end of the pre-charge capacitor C2 and the negative electrode of the charging device 102.

[0159] Reference Figure 11 In some embodiments, the battery charging control circuit further includes a switching circuit 105, the first end of the switching circuit 105 is directly connected to the second end of the main positive relay K11 and the first end of the pre-charge capacitor C2, and the second end of the switching circuit 105 is directly connected to the second end of the pre-charge capacitor C2. In this way, in the case that the main positive relay K11 is turned off, the positive electrode of the charging device 102 and the first end P1 of the charging negative relay can be connected through the switching circuit 105.

[0160] As shown in Figure 10 and Figure 11 In some embodiments, the battery charging control circuit further includes a pre-charge control circuit, and the pre-charge control circuit is connected in parallel between the two ends of the main positive relay K11.

[0161] As shown in Figure 9 In other embodiments, the two ends of the main positive relay K11 can also not be connected in parallel with the pre-charge control circuit.

[0162] In the above technical solution, only a single-sided main positive relay K11 is provided, which can simplify the circuit and reduce the cost while controlling the positive and negative electrodes of the battery 100 to form a loop with other elements.

[0163] Reference Figure 12 to Figure 13According to some embodiments of the present application, the first end of the pre-charge capacitor C2 is connected to the positive pole of the battery 100, the second end of the pre-charge capacitor C2 is connected to the negative pole of the battery 100, the first end P1 of the charging negative relay is connected to the second end of the pre-charge capacitor C2; the main relay 101 is a main negative relay K12, the first end of the main negative relay K12 is connected to the negative pole of the battery 100, and the second end of the main negative relay K12 is connected to the second end of the pre-charge capacitor C2.

[0164] That is, the main negative relay K12 is connected between the second end of the pre-charge capacitor C2 and the negative pole of the battery 100, so that the second end of the pre-charge capacitor C2 is connected to the negative pole of the battery 100 through the main negative relay K12. The first end of the pre-charge capacitor C2 is directly connected to the positive pole of the battery 100, and the reference point G0 is located between the first end of the main negative relay K12 and the negative pole of the battery 100. The charging negative relay 103 is connected between the second end of the pre-charge capacitor C2 and the negative pole of the charging device 102.

[0165] As shown in FIG. 1, Figure 13 In some embodiments, the battery charging control circuit further comprises a pre-charge control circuit, which is connected in parallel to the two ends of the main negative relay K12.

[0166] As shown in FIG. 1, Figure 12 In other embodiments, the two ends of the main negative relay K12 can also not be connected in parallel to the pre-charge control circuit.

[0167] In some embodiments, the battery charging control circuit further comprises a switch circuit 105, the first end of the switch circuit 105 is directly connected to the first end of the pre-charge capacitor C2, and the second end of the switch circuit 105 is directly connected to the second end of the pre-charge capacitor C2 and the second end of the main negative relay K12. In this way, when the main negative relay K12 is off, the positive pole of the charging device 102 and the first end P1 of the charging negative relay can be connected through the switch circuit 105.

[0168] In the above technical solution, only one side of the main negative relay K12 is provided, which can simplify the circuit and reduce the cost while controlling the positive and negative poles of the battery 100 and other elements to form a loop.

[0169] Referring to FIG. 1, Figure 14 to Figure 16 According to some embodiments of the present application, the first end of the pre-charge capacitor C2 is connected to the positive pole of the battery 100, the second end of the pre-charge capacitor C2 is connected to the negative pole of the battery 100, the first end P1 of the charging negative relay is connected to the second end of the pre-charge capacitor C2; the main relay 101 comprises: a main positive relay K11, the first end of the main positive relay K11 is connected to the positive pole of the battery 100, and the second end of the main positive relay K11 is connected to the first end of the pre-charge capacitor C2; a main negative relay K12, the first end of the main negative relay K12 is connected to the negative pole of the battery 100, and the second end of the main negative relay K12 is connected to the second end of the pre-charge capacitor C2.

[0170] That is, the main positive relay K11 is connected between the first end of the pre-charge capacitor C2 and the positive electrode of the battery 100, so that the first end of the pre-charge capacitor C2 is connected to the positive electrode of the battery 100 through the main positive relay K11. The main negative relay K12 is connected between the second end of the pre-charge capacitor C2 and the negative electrode of the battery 100, so that the second end of the pre-charge capacitor C2 is connected to the negative electrode of the battery 100 through the main negative relay K12. Reference point G0 is located between the first end of the main negative relay K12 and the negative electrode of the battery 100. The negative charging relay 103 is connected between the second end of the pre-charge capacitor C2 and the negative electrode of the charging device 102.

[0171] In some embodiments, the battery charging control circuit further includes a pre-charge control circuit. Figure 14 As shown, the pre-charge control circuit can be connected in parallel to both ends of the main positive relay K11. Figure 15 As shown, the pre-charge control circuit can also be connected in parallel to both ends of the main negative relay K12.

[0172] like Figure 16 As shown, in some embodiments, the battery charging control circuit further includes a switch circuit 105. A first end of the switch circuit 105 is directly connected to the second end of the main positive relay K11 and the first end of the pre-charge capacitor C2, and a second end of the switch circuit 105 is directly connected to the second end of the main negative relay K12 and the second end of the pre-charge capacitor C2. Thus, when the main positive relay K11 is turned off, the positive electrode of the charging device 102 and the first end P1 of the negative charging relay can be connected via the switch circuit 105.

[0173] In the above technical solution, the main positive relay K11 and the main negative relay K12 on both sides are used to control the connection between the positive electrode of the battery 100 and the negative electrode of the battery 100 and other components respectively, which can improve the control ability of the loop formed by the positive and negative electrodes of the battery 100 and other components.

[0174] An embodiment of the present application provides a battery 100 system, which includes a battery 100; and the battery charging control circuit in the above embodiment.

[0175] Battery 100 is connected to a battery charging control circuit, and is connected to a charging device 102 through the battery charging control circuit. The battery 100 system has the beneficial effects of the battery charging control circuit provided in the embodiments of the present application. For details, please refer to the detailed description of the battery charging control circuit in the above embodiments, which will not be repeated here.

[0176] An embodiment of the present application provides an electrical device, which includes the battery 100 system in the above embodiment, and the battery 100 system is used to provide electrical energy.

[0177] The power utilization device can refer to the relevant description in the above embodiments, and the following will not be repeated.

[0178] The embodiment of the application provides a battery charging control circuit, referring to Figure 8 and Figure 11 The battery charging control circuit comprises: a main relay 101, a first end of the main relay 101 is used for connecting a battery 100, and a second end of the main relay 101 is used for connecting a charging device 102; a charging negative relay 103, a first end P1 of the charging negative relay is used for connecting a negative electrode of the battery 100, and a second end of the charging negative relay is used for connecting a negative electrode of the charging device 102, a positive electrode and the negative electrode of the battery 100 are connected with a positive electrode and a negative electrode of the charging device 102 through the main relay 101 and the charging negative relay 103, and a reference point G0 is further arranged between the first end P1 of the charging negative relay and the negative electrode of the battery 100; and a sampling circuit 104, connected with the first end and the second end of the charging negative relay, configured to connect the first end and the second end of the charging negative relay to form a first sampling loop during a period when the main relay 101 is closed and the charging negative relay 103 is turned off, and collect a first voltage of two ends of the charging negative relay 103 in the first sampling loop relative to the reference point G0.

[0179] Referring to Figure 11 Exemplarily, the sampling circuit 104 can comprise: a first resistance module 1041 and a first switch S1, the first resistance module 1041 comprises a first resistance element R1 and a second resistance element R2 connected in series, and the first switch S1 is connected in series with the first resistance element R1 and the second resistance element R2. The sampling circuit 104 is configured to collect a voltage value of two ends of the first resistance element R1 in the first sampling loop relative to the reference point G0, and obtain a first sampling voltage based on the voltage value of two ends of the first resistance element R1 relative to the reference point G0, a resistance value of the first resistance element R1 and a resistance value of the second resistance element R2, and the first sampling voltage is taken as the first voltage.

[0180] Referring to Figure 8 Exemplarily, the sampling circuit 104 can further comprise: a second resistance module 1042, a first end of the second resistance module 1042 is connected with a node between the first resistance element R1 and the second resistance element R2, and a second end of the second resistance module 1042 is connected with a bias voltage. The sampling circuit 104 is further configured to collect a second sampling voltage of the node between the first resistance element R1 and the second resistance element R2 in the first sampling loop relative to the reference point G0, and obtain the first voltage based on the second sampling voltage, the bias voltage, the resistance value of the first resistance element R1, the resistance value of the second resistance element R2 and a resistance value of the second resistance module 1042.

[0181] The battery charging control circuit further comprises a switch circuit, a first end of the switch circuit is connected to a positive pole of the charging device 102, and a second end of the switch circuit is connected to a first end P1 of the charging negative relay. The switch circuit comprises a third resistance module and a second switch S2, the third resistance module can comprise a third resistance element R3 and a fourth resistance element R4 connected in series, and the second switch S2 is connected in series with the third resistance element R3 and the fourth resistance element R4. The switch circuit is configured to control the second switch S2 to be closed during the period when the main relay 101 and the charging negative relay 103 are both off. The sampling circuit 104 is configured to close the first switch S1 to form a second sampling loop together with the switch circuit during the period when the main relay 101 and the charging negative relay 103 are both off. The third sampling voltage of a node between the first resistance element R1 and the second resistance element R2 in the second sampling loop relative to the reference point G0 is collected, and the second voltage across the charging negative relay 103 relative to the reference point G0 is obtained based on the third sampling voltage, the bias voltage, the resistance value of the first resistance element R1, the resistance value of the second resistance element R2, and the resistance value of the second resistance module 1042.

[0182] The battery charging control circuit further comprises a pre-charge capacitor C2, the pre-charge capacitor C2 is connected in parallel between the positive pole and the negative pole of the battery 100, a first end of the switch circuit is connected to a first end of the pre-charge capacitor C2, and a second end of the switch circuit is connected to a second end of the pre-charge capacitor C2. The first end of the pre-charge capacitor C2 is connected to the positive pole of the battery 100, and the second end of the pre-charge capacitor C2 is connected to the negative pole of the battery 100.

[0183] The main relay 101 can be a main positive relay, a first end of the main positive relay is connected to the positive pole of the battery 100, and a second end of the main positive relay is connected to the first end of the pre-charge capacitor C2. The main relay 101 can also be a main negative relay, a first end of the main negative relay is connected to the negative pole of the battery 100, and a second end of the main negative relay is connected to the second end of the pre-charge capacitor C2. The main relay 101 can also comprise a main positive relay and a main negative relay, a first end of the main positive relay is connected to the positive pole of the battery 100, and a second end of the main positive relay is connected to the first end of the pre-charge capacitor C2, a first end of the main negative relay is connected to the negative pole of the battery 100, and a second end of the main negative relay is connected to the second end of the pre-charge capacitor C2.

[0184] The battery charging control circuit further comprises a pre-charging control circuit, which is connected in parallel with the two ends of the main positive relay in the case that the main relay 101 is a main positive relay, connected in parallel with the two ends of the main negative relay in the case that the main relay 101 is a main negative relay, and connected in parallel with the two ends of the main positive relay in the case that the main relay 101 comprises a main positive relay and a main negative relay. The pre-charging control circuit comprises a pre-charging relay K21 and a pre-charging resistor R5, and the pre-charging relay K21 is closed in the case that the main relay 101 is off, so as to connect the battery 100 and the pre-charging capacitor C2, and pre-charge the battery 100 for the pre-charging capacitor C2.

[0185] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery charging control circuit, characterized in that: include: a main relay, wherein a first end of the main relay is used to connect to the battery, and a second end of the main relay is used to connect to a charging device; a negative charging relay, wherein a first end of the negative charging relay is used to connect to the negative electrode of the battery, and a second end of the negative charging relay is used to connect to the negative electrode of the charging device. The positive electrode and negative electrode of the battery are respectively connected to the positive electrode and negative electrode of the charging device through the main relay and the negative charging relay. A reference point is also provided between the first end of the negative charging relay and the negative electrode of the battery; A sampling circuit is connected to the first end and the second end of the charging negative relay, and is configured to: connect the first end and the second end of the charging negative relay to form a first sampling loop, and collect a first voltage between the two ends of the charging negative relay relative to the reference point in the first sampling loop when the main relay is closed and the charging negative relay is turned off.

2. The battery charging control circuit according to claim 1, characterized in that: The sampling circuit comprises: a first resistance module; A first switch is connected in series with the first resistor module, and the first resistor module and the first switch connected in series are connected between the first end and the second end of the charging negative relay. The sampling circuit is configured to control the first switch to be closed to form the first sampling loop during a period when the main relay is closed and the charging negative relay is closed.

3. The battery charging control circuit according to claim 2, wherein: The first resistance module includes: a first resistance element and a second resistance element connected in series, wherein an end of the first resistance element away from the second resistance element is connected to the first end of the charging negative relay, and an end of the second resistance element away from the first resistance element is connected to the second end of the charging negative relay; wherein the node between the first resistance element and the second resistance element serves as a sampling point of the sampling circuit in the first sampling loop.

4. The battery charging control circuit according to claim 3, characterized in that: The sampling circuit further includes: A second resistance module, wherein a first end of the second resistance module is connected to a node between the first resistance element and the second resistance element, and a second end of the second resistance module is connected to a bias voltage.

5. The battery charging control circuit according to claim 1, wherein: The battery charging control circuit further includes: a switch circuit, wherein a first end of the switch circuit is used to connect to the positive electrode of the charging device, and a second end of the switch circuit is connected to the first end of the charging negative relay; The switching circuit is configured to connect the charging device and the sampling circuit during a period when both the main relay and the negative charging relay are turned off, so as to form a second sampling loop connected between the positive electrode and the negative electrode of the charging device together with the sampling circuit. The sampling circuit is further configured to collect a second voltage between two ends of the charging negative relay in the second sampling loop relative to the reference point.

6. The battery charging control circuit according to claim 5, characterized in that: The switching circuit comprises: The third resistor module; A second switch is connected in series with the third resistor module, and the third resistor module and the second switch connected in series are connected to the positive electrode of the charging device and the first end of the charging negative relay. The switch circuit is configured to: control the second switch to be closed while both the main relay and the charging negative relay are turned off; The sampling circuit is configured to connect the first end and the second end of the negative charging relay to form the second sampling loop together with the switch circuit when both the main relay and the negative charging relay are turned off.

7. The battery charging control circuit according to claim 5, characterized in that: The sampling circuit comprises: The first resistance module comprises: a first resistance element and a second resistance element connected in series, wherein the first resistance element is connected to the first end of the charging negative relay, and the second resistance element is connected to the second end of the charging negative relay; a first switch connected in series with the first resistance element and the second resistance element; a second resistance module, wherein a first end of the second resistance module is connected to a node between the first resistance element and the second resistance element, and a second end of the second resistance module is connected to a bias voltage; The sampling circuit is configured to: during a period when both the main relay and the charging negative relay are turned off, close the first switch to form a second sampling loop together with the switch circuit, wherein a node between the first resistance element and the second resistance element serves as a sampling point of the sampling circuit in the second sampling loop.

8. The battery charging control circuit according to any one of claims 1 to 7, characterized in that: The battery charging control circuit further includes: A pre-charge capacitor, the pre-charge capacitor is used to be connected in parallel between the positive electrode and the negative electrode of the battery, wherein, The second end of the main relay is also connected to the pre-charge capacitor, and the first end of the negative charging relay is also connected to the pre-charge capacitor.

9. The battery charging control circuit according to claim 8, characterized in that: The battery charging control circuit further includes: A pre-charge control circuit is connected in parallel to both ends of the main relay, and is configured to control the pre-charge capacitor to be connected in series with the battery to form a pre-charge loop during the period when the main relay disconnects the battery from the pre-charge capacitor.

10. The battery charging control circuit according to claim 8, characterized in that: The first end of the pre-charge capacitor is used to connect to the positive electrode of the battery, and the second end is used to connect to the negative electrode of the battery. The first end of the charging negative relay is connected to the second end of the pre-charge capacitor; The main relay is a main positive relay, a first end of the main positive relay is used to connect to the positive electrode of the battery, and a second end of the main positive relay is connected to the first end of the pre-charge capacitor.

11. The battery charging control circuit according to claim 8, characterized in that: The first end of the pre-charge capacitor is used to connect to the positive electrode of the battery, and the second end is used to connect to the negative electrode of the battery. The first end of the charging negative relay is connected to the second end of the pre-charge capacitor; The main relay is a main negative relay, a first end of the main negative relay is used to connect to the negative electrode of the battery, and a second end of the main negative relay is connected to the second end of the pre-charge capacitor.

12. The battery charging control circuit according to claim 8, characterized in that: The first end of the pre-charge capacitor is used to connect to the positive electrode of the battery, and the second end is used to connect to the negative electrode of the battery. The first end of the charging negative relay is connected to the second end of the pre-charge capacitor; The main relay comprises: a main positive relay, wherein a first end of the main positive relay is used to be connected to the positive electrode of the battery, and a second end of the main positive relay is connected to the first end of the pre-charge capacitor; A main negative relay, wherein a first end of the main negative relay is used to connect to the negative electrode of the battery, and a second end of the main negative relay is connected to the second end of the pre-charge capacitor.

13. A battery system, characterized in that: include: Battery; as well as The battery charging control circuit according to any one of claims 1 to 12.

14. An electrical device, characterized in that: The battery system as claimed in claim 13 is provided to supply power to the electrical device.

Images