A high-pressure circuit control system and a vehicle

Abstract

A high-voltage loop control system and a vehicle, comprising: a resistance device having a plurality of resistance values, the resistance device being connected in a high-voltage loop; and a control device configured to select a resistance value of the resistance device according to state information of the high-voltage loop. The high-voltage loop control system provided by the embodiments of the present disclosure can select a resistance value of the resistance device according to state information of the high-voltage loop, so that a control that matches the state of the high-voltage loop can be provided, and the control effect of the high-voltage loop can be improved.

Description

Technical Field

[0001] This disclosure relates to a high-voltage circuit control system and a vehicle. Background Technology

[0002] In related technologies, the high-voltage circuit of new energy vehicles is generally equipped with a main positive switch and a main negative switch. By closing / opening the main positive switch and the main negative switch, the high voltage of the battery pack is increased or decreased. The high-voltage circuit is also equipped with a pre-charging circuit for pre-charging the circuit before the high voltage is applied. The pre-charging circuit is equipped with a pre-charging switch and a pre-charging resistor.

[0003] When an uncontrollable large current occurs during pre-charging or high-voltage operation, the high-voltage circuit is typically disconnected by forcibly disconnecting the high-voltage switch (pre-charge switch or main positive and main negative switches). However, this can easily cause the switch to stick and become damaged, thus posing a safety risk to the battery pack. Summary of the Invention

[0004] The purpose of this disclosure is to provide a high-voltage circuit control system and a vehicle.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0006] This disclosure provides a high-voltage circuit control system, including:

[0007] A resistor device having multiple resistance values, the resistor device being connected in a high-voltage circuit; and

[0008] A control device is used to select the resistance value of the resistor device based on the status information of the high-voltage circuit.

[0009] In some embodiments, the resistor is configured as a pre-charge resistor for a high-voltage circuit; the controller is configured to select the resistance value of the resistor based on the pre-charge information of the high-voltage circuit.

[0010] In some embodiments, the controller's function of selecting the resistance value of the resistor device based on the pre-charge information of the high-voltage circuit includes: the controller selecting the resistance value of the resistor device based on the pre-charge speed of the high-voltage circuit.

[0011] In some embodiments, the controller selects the resistance value of the resistor device according to the pre-charge speed of the high-voltage circuit by: when the pre-charge speed is less than a pre-charge speed threshold, the controller controls the resistance value of the resistor device to decrease.

[0012] In some embodiments, the controller's function of selecting the resistance value of the resistor device based on the pre-charge information of the high-voltage circuit includes: the controller selecting the resistance value of the resistor device based on the pre-charge current of the high-voltage circuit.

[0013] In some embodiments, the controller selects the resistance value of the resistor device based on the pre-charge current of the high-voltage circuit by: when the pre-charge current is continuously greater than a pre-charge current threshold, the controller controls the resistance value of the resistor device to increase.

[0014] In some embodiments, the controller is further configured to: control the resistance value of the resistor device to an initial pre-charge resistance value before pre-charging begins.

[0015] In some embodiments, the initial pre-charge resistance value is determined based on the pre-charge time.

[0016] In some embodiments, the resistor is configured as a protective resistor for a high-voltage circuit; the controller is used to select the resistance value of the resistor based on the charging information of the high-voltage circuit.

[0017] In some embodiments, the controller's function of selecting the resistance value of the resistor device based on the charging information of the high-voltage circuit includes: the controller selecting the resistance value of the resistor device based on the feedback charging information of the high-voltage circuit.

[0018] In some embodiments, the controller's function of selecting the resistance value of the resistor device based on the feedback charging information of the high-voltage circuit includes: the controller selecting the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual battery cell.

[0019] In some embodiments, the controller selects the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual cell, including: when the feedback current is greater than a feedback current threshold and the voltage of the individual cell is greater than a voltage threshold, the controller controls the resistance value of the resistor device to increase.

[0020] In some embodiments, the controller selects the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual battery cell, including:

[0021] When the feedback current is greater than the first feedback current threshold and the voltage of the individual cell is greater than the first voltage threshold, the controller controls the resistance of the resistor device to be the first resistance value.

[0022] When the feedback current is greater than the second feedback current threshold and the voltage of the individual cell is greater than the second voltage threshold, the controller controls the resistance of the resistor device to be the second resistance value.

[0023] When the feedback current is greater than the third feedback current threshold and the voltage of the individual cell is greater than the third voltage threshold, the controller controls the resistance of the resistor device to be the third resistance value.

[0024] In some embodiments, the controller is further configured to adjust the resistance value of the resistive device according to a first resistance value, a second resistance value, and a third resistance value.

[0025] In some embodiments, the controller is further configured to adjust the resistance value of the resistive device according to a first resistance value, a second resistance value, and a third resistance value, including: the controller is further configured to adjust the resistance value of the resistive device according to the maximum resistance value among the first resistance value, the second resistance value, and the third resistance value.

[0026] In some embodiments, the controller's function of selecting the resistance value of the resistor device based on the charging information of the high-voltage circuit includes: the controller selecting the resistance value of the resistor device based on the charging current of the high-voltage circuit.

[0027] In some embodiments, the controller selects the resistance value of the resistor device according to the charging current of the high-voltage circuit by: when the charging current is greater than a charging current threshold, the controller controls the resistance value of the resistor device to increase.

[0028] In some embodiments, the controller is configured to select the resistance value of the resistor device based on the charging current of the high-voltage circuit, including:

[0029] When the charging current is greater than the first charging current threshold, the controller controls the resistance value of the resistor device to be the fourth resistance value;

[0030] When the charging current is greater than the second charging current threshold, the controller is used to control the resistance value of the resistor device to be the fifth resistance value;

[0031] When the charging current is greater than the third charging current threshold, the controller controls the resistance value of the resistor device to be the sixth resistance value.

[0032] In some embodiments, the controller is further configured to adjust the resistance value of the resistive device according to a fourth resistance value, a fifth resistance value, and a sixth resistance value.

[0033] In some embodiments, the controller is further configured to adjust the resistance value of the resistive device according to a fourth resistance value, a fifth resistance value, and a sixth resistance value, including: the controller is further configured to adjust the resistance value of the resistive device according to the maximum resistance value among the fourth resistance value, the fifth resistance value, and the sixth resistance value.

[0034] In some embodiments, the resistive device includes a sliding adjustable resistor.

[0035] In some embodiments, the sliding adjustable resistor device includes:

[0036] A sliding adjustable resistor is connected in the high-voltage circuit;

[0037] Sliding contact; and

[0038] An adjusting device is used to select the resistance value of the sliding adjustable resistor connected to the high-voltage circuit according to the control of the control device by driving the sliding contact.

[0039] In some embodiments, the resistive device includes a switchable resistive device.

[0040] In some embodiments, the switchable adjustable resistor device includes:

[0041] Multiple resistors, the multiple resistors being connected in the high-voltage circuit; and

[0042] The selector switch is used to select the resistor connected to the high-voltage circuit according to the control of the control device.

[0043] In some embodiments, the selector switch is used to short-circuit at least one of the resistors.

[0044] In some embodiments, the plurality of resistors are connected in series, and each of the resistors is connected in parallel with a selection switch.

[0045] In some embodiments, the plurality of resistors are connected in series, and the selection switch includes:

[0046] Multiple connection terminals, each of which is connected to the output terminal of a resistor; and

[0047] The common terminal is connected to the input of all resistors, and its output is used to selectively connect to the connection terminal.

[0048] In some embodiments, the control device is a battery manager.

[0049] In some embodiments, the control device is communicatively connected to the battery manager.

[0050] The high-voltage circuit control system provided in this disclosure can select the resistance value of the resistor device according to the state information of the high-voltage circuit, thereby providing control that is more matched to the state of the high-voltage circuit and improving the control effect of the high-voltage circuit.

[0051] This disclosure also provides a vehicle that includes a high-voltage circuit control system as provided in any of the above embodiments.

[0052] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of a high-voltage circuit control system according to some embodiments;

[0055] Figure 2 This is a schematic diagram of the structure of a high-voltage circuit control system according to some other embodiments;

[0056] Figure 3 This is a schematic diagram of the structure of a high-voltage circuit control system according to some other embodiments;

[0057] Figure 4 This is a control flowchart of a high-voltage circuit control system according to some embodiments;

[0058] Figure 5 Here is a control flowchart of a high-voltage circuit control system according to some other embodiments;

[0059] Figure 6 This is a control flowchart of a high-voltage circuit control system according to some other embodiments. Detailed Implementation

[0060] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0061] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0062] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0063] Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0064] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "communication" should be interpreted broadly. For example, they can refer to fixed electrical connections, detachable electrical connections, or integral electrical connections. Connections can be direct or indirect through an intermediate medium, and can be internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0065] In embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in embodiments of this disclosure is not limited. Functions may be performed in the order shown or discussed, or may be performed substantially simultaneously or in reverse order depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0066] In this disclosure, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this disclosure should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0067] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0068] In related technologies, the high-voltage circuit of new energy vehicles is generally equipped with a main positive switch and a main negative switch. By closing / opening the main positive switch and the main negative switch, the high voltage of the battery pack is increased or decreased. The high-voltage circuit is also equipped with a pre-charging circuit for pre-charging the circuit before the high voltage is applied. The pre-charging circuit is equipped with a pre-charging switch and a pre-charging resistor.

[0069] When an uncontrollable large current occurs during pre-charging or high-voltage operation, the high-voltage circuit is typically disconnected by forcibly disconnecting the high-voltage switch (pre-charge switch or main positive and main negative switches). However, this can easily cause the switch to stick and become damaged, thus posing a safety risk to the battery pack.

[0070] The above situation is common in the following scenarios:

[0071] 1. During pre-charging, the lower pre-charging resistance results in a larger pre-charging current;

[0072] 2. During driving feedback, an uncontrollable large feedback pulse current occurs, leading to battery overvoltage;

[0073] 3. During vehicle charging, an uncontrollable large charging current occurs, leading to battery overcharging.

[0074] In some embodiments, such as Figure 1-3 As shown, this disclosure provides a high-voltage circuit control system, including:

[0075] A resistor device, having multiple resistance values, is connected in a high-voltage circuit; and

[0076] The control device is used to select the resistance value of the resistor device based on the status information of the high-voltage circuit.

[0077] The high-voltage circuit control system provided in this disclosure can select the resistance value of the resistor device according to the state information of the high-voltage circuit, thereby providing control that is more matched to the state of the high-voltage circuit and improving the control effect of the high-voltage circuit.

[0078] In some embodiments, when the resistor device is applied to the pre-charge resistor of a high-voltage circuit, the pre-charge time and pre-charge current can be adjusted to avoid abnormal situations such as pre-charge overcurrent and timeout.

[0079] In some embodiments, when the resistor device is applied to the protective resistor of the high-voltage circuit, it can adjust the input current of the battery pack and avoid abnormal situations such as overvoltage and overcurrent of the battery pack.

[0080] To better control pre-charge, in some embodiments, such as Figure 4 As shown, the resistor is configured as a pre-charge resistor for the high-voltage circuit; the controller is used to select the resistance value of the resistor based on the pre-charge information of the high-voltage circuit.

[0081] That is, a resistor can be used as a pre-charge resistor, and the resistance value of the pre-charge resistor can be adjusted, thereby better controlling the pre-charge and avoiding abnormal situations such as pre-charge overcurrent and timeout.

[0082] To better control pre-charge, in some embodiments, the controller selects the resistance value of the resistor device based on the pre-charge information of the high-voltage circuit, including: the controller selects the resistance value of the resistor device based on the pre-charge speed of the high-voltage circuit.

[0083] The resistance value of the pre-charge control resistor is determined by the pre-charge speed of the high-voltage circuit, thereby achieving better control over the pre-charge and avoiding abnormal situations such as pre-charge overcurrent and timeout.

[0084] To better control pre-charge, in some embodiments, the controller selects the resistance value of the resistor device according to the pre-charge speed of the high-voltage circuit, including controlling the resistance value of the resistor device to decrease when the pre-charge speed is less than a pre-charge speed threshold.

[0085] When the precharge speed is less than the precharge speed threshold, in order to increase the precharge speed, the controller can control the resistance value of the resistor device to decrease, thereby avoiding precharge timeout.

[0086] When the precharge speed is too fast, the controller can increase the resistance value of the resistor device to avoid precharge overcurrent and improve safety.

[0087] To better control pre-charge, in some embodiments, the controller selects the resistance value of the resistor device based on the pre-charge information of the high-voltage circuit, including: the controller selects the resistance value of the resistor device based on the pre-charge current of the high-voltage circuit.

[0088] That is, the resistance value of the resistor device can be controlled according to the magnitude of the pre-charge current, thereby realizing the control of the pre-charge current and improving safety.

[0089] To better control pre-charge, in some embodiments, the controller selects the resistance value of the resistor device based on the pre-charge current of the high-voltage circuit, including controlling the resistance value of the resistor device to increase when the pre-charge current is continuously greater than a pre-charge current threshold.

[0090] When the precharge current is continuously greater than the precharge current threshold, the controller can increase the resistance value of the resistor device to reduce the precharge current, avoid precharge overcurrent, and improve safety.

[0091] To better control pre-charge, in some embodiments, the controller is also used to: control the resistance value of the resistor device to the initial pre-charge resistance value before pre-charge begins.

[0092] When a resistor is used as a predictive resistor, its initial resistance can be zero or at its maximum value. To improve safety, the resistance can be adjusted to the initial pre-charge resistance value before starting pre-charge.

[0093] To better control precharge, in some embodiments, the initial precharge resistance value is determined based on the precharge time.

[0094] Those skilled in the art can reasonably determine the specific value of the initial pre-charge resistance. In some embodiments, the required pre-charge resistance can be calculated based on the pre-charge time to serve as the initial pre-charge resistance, thereby achieving better pre-charge control.

[0095] To better protect the high-voltage circuit, in some embodiments, such as Figure 5 and 6 As shown, the resistor device is configured as a protective resistor for the high-voltage circuit; the controller is used to select the resistance value of the resistor device based on the charging information of the high-voltage circuit.

[0096] That is, the resistor device can be used as a protective resistor for high-voltage circuits to achieve adjustable resistance value, thereby better protecting the high-voltage circuits.

[0097] To better protect the high-voltage circuit, in some embodiments, the controller selects the resistance value of the resistor device based on the charging information of the high-voltage circuit, including: the controller selects the resistance value of the resistor device based on the feedback charging information of the high-voltage circuit.

[0098] The controller can select the resistance value of the resistor device based on the feedback charging information of the high-voltage circuit, thereby improving the circuit safety during feedback charging.

[0099] To better protect the high-voltage circuit, in some embodiments, the controller selects the resistance value of the resistor device based on the feedback charging information of the high-voltage circuit, including: the controller selects the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual battery cell.

[0100] By analyzing the feedback current in the high-voltage circuit and the resistance value of the voltage regulation resistor in the individual battery cell, it is possible to more accurately identify whether an abnormality has occurred during feedback charging, thereby improving the safety and control accuracy during feedback charging.

[0101] To better protect the high-voltage circuit, in some embodiments, the controller selects the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual cell, including: when the feedback current is greater than the feedback current threshold and the voltage of the individual cell is greater than the voltage threshold, the controller controls the resistance value of the resistor device to increase.

[0102] If the feedback current exceeds the feedback current threshold and the voltage of a single cell exceeds the voltage threshold, an abnormal feedback charging can be identified. Increasing the resistance value of the resistor device can help control the feedback current, thereby improving safety.

[0103] The technology in this field can establish a correspondence between the feedback current and the resistance value of the resistor device, and select the appropriate resistance value according to different feedback currents to improve the protection effect.

[0104] To better protect the high-voltage circuit, in some embodiments, such as Figure 5 As shown, the controller selects the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual battery cell, including:

[0105] When the feedback current is greater than the first feedback current threshold and the voltage of a single cell is greater than the first voltage threshold, the controller controls the resistance of the resistor device to be the first resistance value.

[0106] When the feedback current is greater than the second feedback current threshold and the voltage of the individual cell is greater than the second voltage threshold, the controller controls the resistance of the resistor device to be the second resistance value.

[0107] When the feedback current is greater than the third feedback current threshold and the voltage of a single cell is greater than the third voltage threshold, the controller controls the resistance of the resistor device to be the third resistance value.

[0108] Through the above control, the resistance value of the resistor device can be adjusted according to the feedback current and the voltage of the individual battery cells to better control the magnitude of the feedback current, thereby improving safety.

[0109] To better protect the high-voltage circuit, in some embodiments, the controller is also used to adjust the resistance value of the resistive device according to a first resistance value, a second resistance value, and a third resistance value.

[0110] By adjusting multiple resistance values, the target resistance value can be determined based on the control effect after adjustment, thereby improving the protection effect.

[0111] To better protect the high-voltage circuit, in some embodiments, the controller is also used to adjust the resistance value of the resistive device according to a first resistance value, a second resistance value, and a third resistance value, including: the controller is also used to adjust the resistance value of the resistive device according to the maximum resistance value among the first resistance value, the second resistance value, and the third resistance value.

[0112] Using the largest resistance value among multiple resistance values, such as the first resistance value, the second resistance value, and the third resistance value, as the target resistance value can maximize the protection effect.

[0113] To better protect the high-voltage circuit, in some embodiments, such as Figure 6As shown, the controller selects the resistance value of the resistor device based on the charging information of the high-voltage circuit, including: the controller selects the resistance value of the resistor device based on the charging current of the high-voltage circuit.

[0114] Those skilled in the art can select appropriate charging information, such as charging voltage, as a judgment condition. In order to simplify control, the resistance value can be adjusted according to the charging current, thereby making it easier and more direct to determine the required resistance value and improve safety.

[0115] To better protect the high-voltage circuit, in some embodiments, the controller selects the resistance value of the resistor device according to the charging current of the high-voltage circuit, including: when the charging current is greater than a charging current threshold, the controller controls the resistance value of the resistor device to increase.

[0116] When the charging current exceeds the charging current threshold, an overcharge risk can be identified. Increasing the resistance value can control the charging current, which helps reduce the overcharge risk and improve charging safety.

[0117] To better protect the high-voltage circuit, in some embodiments, such as Figure 6 As shown, the controller selects the resistance value of the resistor device based on the charging current of the high-voltage circuit, including:

[0118] When the charging current is greater than the first charging current threshold, the controller controls the resistance value of the resistor device to be the fourth resistance value.

[0119] When the charging current is greater than the second charging current threshold, the controller controls the resistance value of the resistor device to be the fifth resistance value.

[0120] When the charging current is greater than the third charging current threshold, the controller controls the resistance value of the resistor device to be the sixth resistance value.

[0121] Through the above control, the resistance value of the resistor device can be adjusted according to the magnitude of the charging current, so as to better control the magnitude of the charging current and thus improve safety.

[0122] To better protect the high-voltage circuit, in some embodiments, the controller is also used to adjust the resistance value of the resistive device according to the fourth, fifth, and sixth resistance values.

[0123] By adjusting multiple resistance values, the target resistance value can be determined based on the control effect after adjustment, thereby improving the protection effect.

[0124] To better protect the high-voltage circuit, in some embodiments, the controller is also used to adjust the resistance value of the resistive device according to a fourth resistance value, a fifth resistance value, and a sixth resistance value, including: the controller is also used to adjust the resistance value of the resistive device according to the maximum resistance value among the fourth resistance value, the fifth resistance value, and the sixth resistance value.

[0125] Using the largest resistance value among multiple resistance values, such as the fourth, fifth, and sixth resistance values, as the target resistance value can maximize the protection effect.

[0126] To facilitate adjustment of the resistance value, in some embodiments, the resistive device includes a sliding adjustable resistive device.

[0127] Those skilled in the art can choose various suitable resistor devices to achieve the need for resistance adjustment, and the sliding adjustable resistor device is a simple and easy solution.

[0128] To facilitate adjustment of the resistance value, in some embodiments, the sliding adjustable resistor device includes:

[0129] A sliding adjustable resistor is connected in the high-voltage circuit;

[0130] Sliding contact; and

[0131] The regulating device is used to select the resistance value of the sliding adjustable resistor connected to the high-voltage circuit according to the control of the control device by driving the sliding contact.

[0132] The above structure enables sliding adjustment of the resistance, and the solution is simple and easy to implement.

[0133] To facilitate adjustment of the resistance value, in some embodiments, the resistor device includes a switchable adjustable resistor device.

[0134] Those skilled in the art can choose various suitable resistor devices to achieve the need for resistance adjustment, and the solution of switch-type adjustable resistor device is simple and easy to implement.

[0135] To facilitate adjustment of the resistance value, in some embodiments, the switch-type adjustable resistor device includes:

[0136] Multiple resistors are connected in a high-voltage circuit; and

[0137] The selector switch is used to select the resistor connected to the high-voltage circuit according to the control of the control device.

[0138] The required resistance value can be selected by choosing a switch, making the solution simple and easy to implement.

[0139] To facilitate adjustment of the resistance value, in some embodiments, a selector switch is used to short-circuit at least one resistor.

[0140] Adjustable resistance can be achieved by using a short-circuit resistor, a simple and easy solution.

[0141] To facilitate resistance value adjustment, in some embodiments, multiple resistors are connected in series, and each resistor is connected in parallel with a selector switch.

[0142] Adjustable resistance can be easily and conveniently achieved by short-circuiting multiple resistors with multiple selector switches.

[0143] To facilitate resistance value adjustment, in some embodiments, multiple resistors are connected in series, and the selection switch includes:

[0144] Multiple connection terminals, each connected to the output terminal of a resistor; and

[0145] The common terminal is connected to the input of all resistors, and its output is used for selective connection.

[0146] By using a single switch to select multiple resistance values, adjustable resistance can be achieved simply and conveniently.

[0147] For ease of control, in some embodiments, the control device is a battery manager.

[0148] The control device can be implemented using a battery manager, which simplifies the system structure and reduces system costs.

[0149] For ease of control, in some embodiments, the control device is communicatively connected to the battery manager.

[0150] By communicating with the battery manager through the control device, the resistance value of the resistor can be adjusted more conveniently and flexibly, achieving better control.

[0151] The high-voltage circuit control system provided in this disclosure can select the resistance value of the resistor device according to the state information of the high-voltage circuit, thereby providing control that is more matched to the state of the high-voltage circuit and improving the control effect of the high-voltage circuit.

[0152] The embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0153] like Figure 4 As shown, the logic flow for achieving adjustable pre-charge resistance is as follows:

[0154] ① Determine if high voltage is applied: If high voltage is applied, adjust the pre-charge resistor to the resistance value specified for the pre-charge time;

[0155] ② Close the high-voltage switch to perform pre-charging;

[0156] ③ Determine the pre-charging speed and pre-charging current during the pre-charging process:

[0157] A. If the pre-charge speed is less than the lower limit of the pre-charge speed, reduce the pre-charge resistance;

[0158] B. If the pre-charge current remains large, increase the pre-charge resistance;

[0159] ④ Determine whether the pre-charging is successful:

[0160] A. If the pre-charging is completed within the specified time, the pre-charging is successful and the power-on is completed; otherwise, make the following judgments:

[0161] B. Whether the number of pre-charging attempts is greater than n times: If so, the pre-charging fails; otherwise, proceed to step 5;

[0162] ⑤ Disconnect the main high-voltage switch and return to step ② after a short time;

[0163] During the pre-charging process, the pre-charging current and pre-charging time are changed by adjusting the resistance value of the pre-charge resistor, and the pre-charging is successfully achieved within the specified number of pre-charging attempts. This strategy can be applied to abnormal problems such as a relatively small pre-charge resistor inside the battery pack resulting in an excessive pre-charging current, or a relatively large pre-charge resistor and X capacitor resulting in a pre-charging timeout.

[0164] As Figure 5 shown, the logical process for implementing an adjustable protection resistor is as follows:

[0165] 1) After the pre-charging is completed, adjust the resistance value of the pre-charge resistor to 0;

[0166] 2) Perform real-time overvoltage feedback judgment at 3 levels:

[0167] A. Overvoltage feedback judgment 1: If the feedback current > XX1 and the cell voltage > YY1, adjust the protection resistor to R1; after adjusting the protection resistor, if the feedback current < ZZ1 and the cell voltage < UU1, adjust the protection resistor to 0; ​​​​​​​​​​​​​​​​​​

[0174] YY1 < YY2 < YY3

[0175] ZZ1 < ZZ2 < ZZ3

[0176] UU1 < UU2 < UU3

[0177] R1 < R2 < R3

[0178] By adjusting the protection resistance in multiple levels, a voltage division and current reduction effect is generated to reduce the feedback current of the battery pack and prevent the battery from overvoltage and causing safety risks. This strategy can be applied to the problem of forcibly disconnecting the high-voltage switch due to abnormal and uncontrollable large current feedback during the driving of the whole vehicle.

[0179] Such as Figure 6 shown, the logic flow to achieve adjustable protection resistance is as follows:

[0180] (1) After the pre-charging is completed, adjust the pre-charge resistance value to 0; if charging is required, close the fast-charging high-voltage switch;

[0181] (2) Perform real-time overcharge judgment at 3 levels:

[0182] A. Overcharge judgment 1: If the charging current > XX1, adjust the protection resistance to R1'; after adjusting the protection resistance, if the charging current < YY1, adjust the protection resistance to 0;

[0183] B. Overcharge judgment 2: If the charging current > XX2, adjust the protection resistance to R2'; after adjusting the protection resistance, if the charging current < YY2, adjust the protection resistance to 0;

[0184] C. Overcharge judgment 3: If the charging current > XX3, adjust the protection resistance to R3'; after adjusting the protection resistance, if the charging current < YY3, adjust the protection resistance to 0;

[0185] (3) Take the resistance value after the above 3-level overcharge judgment, and take the maximum value as the adjustment target;

[0186] (4) If the lower high-voltage condition is met, disconnect the fast-charging high-voltage switch and the main high-voltage switch; otherwise, return to step 2;

[0187] Among them, for the 3-level overcharge judgment, from level 1 to level 3, the judgment conditions can be successively strict, and the protection resistance values increase successively:

[0188] XX1 < XX2 < XX3

[0189] YY1 < YY2 < YY3

[0190] R1' < R2' < R3'

[0191] By adjusting the protection resistors in multiple stages, a voltage divider and current-reducing effect is created, decreasing the charging current entering the battery pack and preventing overcharging that could pose a safety risk. This strategy can be applied to situations where abnormally large or uncontrollable current input during vehicle charging forces the high-voltage switch to disconnect.

[0192] The solution of this disclosure has the following beneficial effects:

[0193] When used as a pre-charge resistor, the pre-charge resistor is adjustable, thereby regulating the pre-charge current and pre-charge time, so that the battery pack can be successfully pre-charged within a specified number of times, and preventing pre-charge timeout.

[0194] When used as a protective resistor, it is multi-stage adjustable. During driving, it reduces voltage and current, decreasing the battery's feedback current and preventing overvoltage. During charging, it generates voltage and current reduction, thereby reducing the battery's charging current and preventing overcharging.

[0195] This disclosure also provides a vehicle that includes a high-voltage circuit control system as provided in any of the above embodiments.

[0196] The embodiments of this disclosure have been described above with reference to the accompanying drawings. However, this disclosure is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this disclosure without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this disclosure.

Claims

1. A high-voltage circuit control system, characterized in that, include: A resistor device having multiple resistance values, the resistor device being connected to a high-voltage circuit; as well as A control device is used to select the resistance value of the resistor device based on the status information of the high-voltage circuit.

2. The high-voltage circuit control system according to claim 1, characterized in that, The resistor is configured as a pre-charge resistor for the high-voltage circuit; the controller is used to select the resistance value of the resistor based on the pre-charge information of the high-voltage circuit.

3. The high-voltage circuit control system according to claim 2, characterized in that, The controller is used to select the resistance value of the resistor device according to the pre-charge information of the high-voltage circuit, including: the controller is used to select the resistance value of the resistor device according to the pre-charge speed of the high-voltage circuit.

4. The high-voltage circuit control system according to claim 3, characterized in that, The controller is used to select the resistance value of the resistor device according to the pre-charge speed of the high-voltage circuit, including: when the pre-charge speed is less than the pre-charge speed threshold, the controller controls the resistance value of the resistor device to decrease.

5. The high-voltage circuit control system according to claim 2, characterized in that, The controller is used to select the resistance value of the resistor device based on the pre-charge information of the high-voltage circuit, including: the controller is used to select the resistance value of the resistor device based on the pre-charge current of the high-voltage circuit.

6. The high-voltage circuit control system according to claim 5, characterized in that, The controller is used to select the resistance value of the resistor device according to the pre-charge current of the high-voltage circuit, including: when the pre-charge current is continuously greater than the pre-charge current threshold, the controller controls the resistance value of the resistor device to increase.

7. The high-voltage circuit control system according to claim 2, characterized in that, The controller is also used to: control the resistance value of the resistor device to the initial pre-charge resistance value before the pre-charge begins.

8. The high-voltage circuit control system according to claim 7, characterized in that, The initial pre-charge resistance value is determined based on the pre-charge time.

9. The high-voltage circuit control system according to claim 1, characterized in that, The resistor device is configured as a protective resistor for the high-voltage circuit; the controller is used to select the resistance value of the resistor device according to the charging information of the high-voltage circuit.

10. The high-voltage circuit control system according to claim 9, characterized in that, The controller is used to select the resistance value of the resistor device based on the charging information of the high-voltage circuit, including: the controller is used to select the resistance value of the resistor device based on the feedback charging information of the high-voltage circuit.

11. The high-voltage circuit control system according to claim 10, characterized in that, The controller is used to select the resistance value of the resistor device based on the feedback charging information of the high-voltage circuit, including: the controller is used to select the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual battery cell.

12. The high-voltage circuit control system according to claim 11, characterized in that, The controller is used to select the resistance value of the resistor device according to the feedback current of the high-voltage circuit and the voltage of the individual cell, including: when the feedback current is greater than the feedback current threshold and the voltage of the individual cell is greater than the voltage threshold, the controller controls the resistance value of the resistor device to increase.

13. The high-voltage circuit control system according to claim 11, characterized in that, The controller is used to select the resistance value of the resistor device based on the feedback current of the high-voltage circuit and the voltage of the individual battery cell, including: When the feedback current is greater than the first feedback current threshold and the voltage of the individual cell is greater than the first voltage threshold, the controller controls the resistance of the resistor device to be the first resistance value. When the feedback current is greater than the second feedback current threshold and the voltage of the individual cell is greater than the second voltage threshold, the controller controls the resistance of the resistor device to be the second resistance value. When the feedback current is greater than the third feedback current threshold and the voltage of the individual cell is greater than the third voltage threshold, the controller controls the resistance of the resistor device to be the third resistance value.

14. The high-voltage circuit control system according to claim 13, characterized in that, The controller is also used to adjust the resistance value of the resistive device according to the first resistance value, the second resistance value, and the third resistance value.

15. The high-voltage circuit control system according to claim 14, characterized in that, The controller is further configured to adjust the resistance value of the resistive device according to the first resistance value, the second resistance value, and the third resistance value, including: the controller is further configured to adjust the resistance value of the resistive device according to the maximum resistance value among the first resistance value, the second resistance value, and the third resistance value.

16. The high-voltage circuit control system according to claim 9, characterized in that, The controller is used to select the resistance value of the resistor device according to the charging information of the high-voltage circuit, including: the controller is used to select the resistance value of the resistor device according to the charging current of the high-voltage circuit.

17. The high-voltage circuit control system according to claim 16, characterized in that, The controller is used to select the resistance value of the resistor device according to the charging current of the high-voltage circuit, including: when the charging current is greater than the charging current threshold, the controller controls the resistance value of the resistor device to increase.

18. The high-voltage circuit control system according to claim 16, characterized in that, The controller is used to select the resistance value of the resistor device according to the charging current of the high-voltage circuit, including: When the charging current is greater than the first charging current threshold, the controller controls the resistance value of the resistor device to be the fourth resistance value; When the charging current is greater than the second charging current threshold, the controller is used to control the resistance value of the resistor device to be the fifth resistance value; When the charging current is greater than the third charging current threshold, the controller controls the resistance value of the resistor device to be the sixth resistance value.

19. The high-voltage circuit control system according to claim 18, characterized in that, The controller is also used to adjust the resistance value of the resistive device according to the fourth resistance value, the fifth resistance value, and the sixth resistance value.

20. The high-voltage circuit control system according to claim 19, characterized in that, The controller is further configured to adjust the resistance value of the resistive device according to the fourth resistance value, the fifth resistance value, and the sixth resistance value, including: the controller is further configured to adjust the resistance value of the resistive device according to the maximum resistance value among the fourth resistance value, the fifth resistance value, and the sixth resistance value.

21. The high-voltage circuit control system according to any one of claims 1-20, characterized in that, The resistor device includes: a sliding adjustable resistor device.

22. The high-voltage circuit control system according to claim 21, characterized in that, The sliding adjustable resistor device includes: A sliding adjustable resistor is connected in the high-voltage circuit; Sliding contact; and An adjusting device is used to select the resistance value of the sliding adjustable resistor connected to the high-voltage circuit according to the control of the control device by driving the sliding contact.

23. The high-voltage circuit control system according to claims 1-20, characterized in that, The resistor device includes: a switch-type adjustable resistor device.

24. The high-voltage circuit control system according to claim 23, characterized in that, The switch-type adjustable resistor device includes: Multiple resistors, the multiple resistors being connected in the high-voltage circuit; and The selector switch is used to select the resistor connected to the high-voltage circuit according to the control of the control device.

25. The high-voltage circuit control system according to claim 24, characterized in that, The selector switch is used to short-circuit at least one of the resistors.

26. The high-voltage circuit control system according to claim 24, characterized in that, The plurality of resistors are connected in series, and each resistor is connected in parallel with a selection switch.

27. The high-voltage circuit control system according to claim 24, characterized in that, The plurality of resistors are connected in series, and the selection switch includes: Multiple connection terminals, each of which is connected to the output terminal of a resistor; and The common terminal is connected to the input of all resistors, and its output is used to selectively connect to the connection terminal.

28. The high-voltage circuit control system according to claim 1, characterized in that, The control device is a battery manager.

29. The high-voltage circuit control system according to claim 1, characterized in that, The control device is communicatively connected to the battery manager.

30. A vehicle, characterized in that, include: The high-voltage circuit control system according to any one of claims 1-29.

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