Discharge circuit for battery charging and battery charging control method

Abstract

The present application provides a discharge circuit for battery charging and a battery charging control method, which belongs to the field of battery technology. The discharge circuit includes: a pressure relief module, which is configured to connect the positive electrode of the battery to be charged and the ground terminal, and / or connect the negative electrode of the battery to be charged and the ground terminal, so as to discharge the ground voltage of the positive electrode of the battery to be charged connected thereto or the ground voltage of the negative electrode of the battery to be charged; wherein the positive electrode and the negative electrode of the battery to be charged are connected to the power supply terminal of the power supply module. The discharge circuit of the present application can reduce the virtual pressure generated at the power supply terminal when the battery is connected to the power supply terminal, thereby improving the success rate of starting charging of the battery to be charged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a discharge circuit for battery charging and a battery charging control method. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] When the vehicle is charging, there may be a problem of charging failure. One of the reasons is that according to the provisions of the national standard safety document, the voltage of the power supply end will be detected and judged before charging. If the voltage is above the preset voltage threshold (such as 10V or 60V), it will cause charging failure. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one object of the present application is to provide a discharge circuit for battery charging to improve the success rate of battery startup charging.

[0005] An embodiment of the first aspect of the present application provides a discharge circuit for battery charging, comprising: a pressure relief module, configured to connect the positive electrode of a battery to be charged and a ground terminal, and / or to connect the negative electrode of the battery to be charged and a ground terminal, so as to discharge the voltage of the positive electrode of the battery to be charged to the ground or the voltage of the negative electrode of the battery to be charged to the ground connected thereto; wherein the positive electrode and the negative electrode of the battery to be charged are connected to the power supply terminal of the power supply module.

[0006] In the technical solution of the embodiment of the present application, by setting a pressure relief module, the voltage of the positive electrode of the battery to be charged to the ground or the voltage of the negative electrode to the ground of the battery to be charged connected thereto is discharged, which can greatly reduce the potential difference between the positive electrode / negative electrode of the battery and the ground terminal. In this way, after the positive electrode and the negative electrode of the battery to be charged are connected to the power supply terminal of the power supply module, even if the positive electrode or the negative electrode of the battery to be charged may form a potential loop between the ground terminal and the power supply terminal, resulting in the branch where the power supply terminal is located in the potential loop being connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged to the ground terminal, the potential difference between the positive electrode / negative electrode of the battery to be charged and the ground terminal is greatly reduced, and the potential difference between the two ends of the branch where the power supply terminal is located is also pulled down accordingly, thereby reducing the voltage of the power supply terminal, so that the voltage of the power supply terminal can be lower than the preset voltage threshold, thereby improving the success rate of starting charging of the battery to be charged.

[0007] In some embodiments, the pressure relief module includes: a first pressure relief unit, a first end of the first pressure relief unit is connected to the positive / negative electrode of the battery to be charged, a second end of the first pressure relief unit is connected to the ground, the first pressure relief unit includes a first switch, the first switch is configured to be closed so that the first pressure relief unit connects the ground and the positive / negative electrode of the battery to be charged, and the first pressure relief unit is configured to discharge the voltage of the positive / negative electrode connected thereto to the ground. In this way, it is possible to close the first switch only before detecting the voltage at the power supply end to reduce the voltage at the power supply end and improve the success rate of starting charging of the battery to be charged. After the battery to be charged starts charging, the first switch is disconnected, which will not affect the normal charging of the battery and improve the reliability of battery charging.

[0008] In some embodiments, the first pressure relief unit includes: a first resistor module, the first resistor module is connected in series with a first switch, and the first switch is configured to be closed so that the two ends of the first resistor module are electrically connected to the ground terminal and the positive electrode / negative electrode of the battery to be charged, respectively. In other words, the first switch can be closed so that the first resistor module is connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged to the ground terminal, so as to play a role in voltage division, pull down the potential difference between the positive electrode / negative electrode of the battery to be charged and the ground terminal, reduce the voltage of the power supply terminal, and improve the success rate of starting charging of the battery to be charged.

[0009] In some embodiments, the first pressure relief unit further includes: a second resistor module, connected in parallel with the first resistor module, and the first switch is configured to be closed so that the first resistor module and the second resistor module are connected in parallel between the ground terminal and the positive / negative electrode of the battery to be charged. In this way, the branch after the first resistor module and the second resistor module are connected in parallel is then connected in parallel with the branch from the positive / negative electrode of the battery to be charged to the ground terminal. Since the resistance of the branch after the first resistor module and the second resistor module are connected in parallel is smaller than the resistance of the branch where only the first resistor module is located, the potential difference between the positive / negative electrode of the battery to be charged and the ground terminal can be further lowered, thereby further reducing the voltage of the power supply terminal, greatly improving the success rate of starting charging of the battery to be charged.

[0010] In some embodiments, the equivalent resistance of the second resistance module is less than the equivalent resistance of the first resistance module. A second resistance module with a smaller equivalent resistance is connected in parallel at both ends of the first resistance module, which can further reduce the resistance of the branch after the first resistance module and the second resistance module are connected in parallel, thereby further lowering the potential difference between the positive / negative electrode of the battery to be charged and the ground terminal, so that the potential difference between the positive / negative electrode of the battery to be charged and the ground terminal is close to 0V, and then the voltage of the power supply terminal is also close to 0V, which greatly improves the success rate of starting charging of the battery to be charged.

[0011] In some embodiments, the pressure relief module includes: a second pressure relief unit, the second pressure relief unit includes a second switch, wherein the first end of the second pressure relief unit is connected to the negative electrode of the battery to be charged, the second end is connected to the ground end, and the second switch is configured to be closed so that the second pressure relief unit connects the ground end and the negative electrode of the battery to be charged to discharge the voltage of the negative electrode to the ground; the first end of the first pressure relief unit is connected to the positive electrode of the battery to be charged, and the second end is connected to the ground end. In other words, the first pressure relief unit can discharge the voltage of the positive electrode of the battery to be charged to the ground, and the second pressure relief unit can discharge the voltage of the negative electrode of the battery to be charged to the ground, so that no matter whether the positive electrode or the negative electrode of the battery to be charged forms a potential loop between the ground end and the power supply end, the voltage of the power supply end can be pulled down by turning on the first pressure relief unit through the first switch or by turning on the second pressure relief unit through the second switch, thereby further improving the success rate of starting charging of the battery to be charged.

[0012] In some embodiments, the structure of the second pressure relief unit is the same as that of the first pressure relief unit. In this way, the layout of the circuit can be simplified, and the discharge effect of the positive electrode voltage to ground and the negative electrode voltage to ground of the battery to be charged can be consistent through the first pressure relief unit and the second pressure relief unit, and thus, whether the positive electrode or the negative electrode of the battery to be charged forms a potential loop between the ground terminal and the power supply terminal, the voltage of the power supply terminal can be significantly lowered through the first pressure relief unit or the second pressure relief unit, thereby improving the success rate of starting charging of the battery to be charged.

[0013] In some embodiments, the first switch and the second switch are configured to be closed in the same time period, and the equivalent resistance formed by the first pressure relief unit between the positive electrode of the battery to be charged and the ground terminal is different from the equivalent resistance formed by the second pressure relief unit between the negative electrode of the battery to be charged and the ground terminal. In this way, the first pressure relief unit or the second pressure relief unit with a smaller equivalent resistance has a smaller voltage division, which can lower the ground voltage of the positive electrode / negative electrode of the battery to be charged connected to the first pressure relief unit or the second pressure relief unit with a smaller equivalent resistance, so that no matter whether the first pressure relief unit or the second pressure relief unit is turned on alone or together, it can play the effect of lowering the voltage of the power supply end, thereby simplifying the control of the circuit.

[0014] In some embodiments, the structure of the second pressure relief unit is the same as that of the first pressure relief unit. When the first pressure relief unit includes a first resistor module and a second resistor module, the first pressure relief unit further includes: a third switch, the third switch is connected in series with the second resistor module of the first pressure relief unit and in parallel with the first resistor module of the second pressure relief unit. The second pressure relief unit further includes: a fourth switch, the fourth switch is connected in series with the second resistor module of the second pressure relief unit and in parallel with the first resistor module of the second pressure relief unit. The third switch and the fourth switch are configured such that when one of them is closed, the other is disconnected. Since the structures of the first pressure relief unit and the second pressure relief unit are the same, the conversion of the magnitude relationship of the equivalent resistance values ​​of the first pressure relief unit and the second pressure relief unit can be achieved by staggered conduction of the third switch and the fourth switch, so that the voltage to the ground of the positive electrode of the rechargeable battery and the voltage to the ground of the negative electrode of the rechargeable battery can be discharged respectively.

[0015] In some embodiments, the discharge circuit further includes: a fifth switch and a third resistor module connected in series between the positive electrode of the battery to be charged and the negative electrode of the power supply end, the fifth switch being configured to be closed during the closing period of the first switch, the second switch and the fourth switch, so that the two ends of the third resistor module are respectively electrically connected to the positive electrode of the battery to be charged and the negative electrode of the power supply end; a sixth switch and a fourth resistor module connected in series between the negative electrode of the battery to be charged and the positive electrode of the power supply end, the sixth switch being configured to be closed during the closing period of the first switch, the second switch and the third switch, so that the two ends of the fourth resistor module are respectively electrically connected to the negative electrode of the battery to be charged and the positive electrode of the power supply end. By turning on the third resistor module and the fourth resistor module respectively, when the pressure relief module discharges the voltage of the negative electrode and the positive electrode of the battery to be charged to the ground respectively, a bridge structure can be formed between the charging end and the battery to be charged together with the ground end, so that the potential difference between the power supply end and the ground end tends to be balanced, so that the voltage of the power supply end is 0V or close to 0V, which greatly improves the success rate of starting charging of the battery to be charged.

[0016] In some embodiments, the pressure relief module further includes: a seventh switch and a fifth resistor module connected in series between the positive electrode of the battery to be charged and the ground terminal, and / or an eighth switch and a sixth resistor module connected in series between the negative electrode of the battery to be charged and the ground terminal, the seventh switch is configured to be closed so that the pressure relief module discharges the voltage of the positive electrode of the battery to be charged to the ground, and the eighth switch is configured to be closed so that the pressure relief module discharges the voltage of the negative electrode of the battery to be charged to the ground. The fifth resistor module and the sixth resistor module can play a role in voltage division, further pulling down the voltage of the power supply end.

[0017] In some embodiments, the pressure relief module is further configured to detect the insulation resistance of the positive electrode of the battery to be charged to the ground, and to detect the insulation resistance of the negative electrode of the battery to be charged to the ground. That is to say, by setting the pressure relief module, it is not only used to lower the voltage of the power supply end in the step of detecting the voltage of the power supply end, thereby improving the success rate of starting charging of the battery to be charged, but also can be used for insulation detection of the battery to be charged after the battery to be charged successfully starts charging, thereby ensuring the safe operation of the battery to be charged. In this way, there is no need to set up an additional module for insulation detection in the circuit, thereby greatly simplifying the circuit structure.

[0018] The embodiment of the second aspect of the present application provides a battery charging control method, including: connecting the positive and negative electrodes of the battery to be charged to the power supply end of the power supply module; discharging the ground voltage of the positive / negative electrode of the battery to be charged; detecting the voltage of the power supply end; and controlling the power supply end to charge the battery to be charged based on the detected voltage of the power supply end being less than a preset voltage threshold. In this way, even if the positive or negative electrode of the battery to be charged may form a potential loop between the ground end and the power supply end, resulting in the branch where the power supply end is located in the potential loop being connected in parallel with the branch from the positive / negative electrode of the battery to be charged to the ground end, the potential difference between the positive / negative electrode of the battery to be charged and the ground end is greatly reduced, and the potential difference between the two ends of the branch where the power supply end is located is correspondingly reduced, thereby reducing the voltage of the power supply end, so that the voltage of the power supply end can be lower than the preset voltage threshold, thereby improving the success rate of starting charging of the battery to be charged.

[0019] In some embodiments, discharging the ground voltage of the positive electrode / negative electrode of the battery to be charged includes: constructing a discharge circuit, the discharge circuit including a pressure relief module; the pressure relief module connects the positive electrode of the battery to be charged and the ground terminal, and / or connects the negative electrode of the battery to be charged and the ground terminal, so as to discharge the ground voltage of the positive electrode of the battery to be charged or the ground voltage of the negative electrode of the battery to be charged connected thereto. By constructing a discharge circuit to discharge the ground voltage of the positive electrode / negative electrode of the battery to be charged, the voltage discharge step is simplified.

[0020] In some embodiments, the pressure relief module connects the positive electrode of the battery to be charged and the ground terminal, and discharges the voltage of the positive electrode of the battery to be charged to the ground, including: controlling the pressure relief module to form an equivalent resistance between the positive electrode of the battery to be charged and the ground terminal to be smaller than the insulation resistance of the positive electrode of the battery to be charged to the ground; the pressure relief module connects the negative electrode of the battery to be charged and the ground terminal, and discharges the voltage of the negative electrode of the battery to be charged to the ground, including: controlling the pressure relief module to form an equivalent resistance between the negative electrode of the battery to be charged and the ground terminal to be smaller than the insulation resistance of the negative electrode of the battery to be charged to the ground. In this way, during the period when the pressure relief module connects the positive / negative electrode of the battery to be charged and the ground terminal, the pressure relief module is connected in parallel with the insulation resistance of the positive / negative electrode of the battery to be charged to the ground, and the resistance after parallel connection is greatly reduced, thereby lowering the potential between the positive / negative electrode of the battery to be charged and the ground terminal, reducing the voltage of the power supply terminal, and improving the success rate of starting charging of the battery to be charged.

[0021] In some embodiments, the pressure relief module includes: a first pressure relief unit and a second pressure relief unit, the first pressure relief unit is connected to the positive electrode of the battery to be charged and the ground terminal, the second pressure relief unit is connected to the negative electrode of the battery to be charged and the ground terminal, the first pressure relief unit includes a first switch, and the second pressure relief unit includes a second switch, and discharging the voltage of the positive electrode of the battery to be charged to the ground includes: closing the first switch so that the first pressure relief unit connects the positive electrode of the battery to be charged and the ground terminal; the first pressure relief unit discharges the voltage of the positive electrode to the ground; discharging the voltage of the negative electrode of the battery to be charged to the ground includes: closing the second switch so that the second pressure relief unit connects the negative electrode of the battery to be charged and the ground terminal; the second pressure relief unit discharges the voltage of the negative electrode to the ground. The first pressure relief unit can discharge the voltage of the positive electrode of the battery to be charged to the ground, and the second pressure relief unit can discharge the voltage of the negative electrode of the battery to be charged to the ground. Therefore, no matter whether the positive electrode or the negative electrode of the battery to be charged forms a potential loop between the ground terminal and the power supply terminal, the voltage of the power supply terminal can be lowered by turning on the first pressure relief unit through the first switch or by turning on the second pressure relief unit through the second switch, thereby further improving the success rate of starting charging of the battery to be charged.

[0022] In some embodiments, the first pressure relief unit and the second pressure relief unit both include: a first resistor module, the first resistor module of the first pressure relief unit is connected in series with the first switch, and the first resistor module of the second pressure relief unit is connected in series with the second switch, and the voltage of the positive electrode of the battery to be charged to the ground is discharged including: closing the first switch so that the first resistor module is connected between the positive electrode of the battery to be charged and the ground terminal; the voltage of the negative electrode of the battery to be charged to the ground is discharged including: closing the second switch so that the first resistor module is connected between the negative electrode of the battery to be charged and the ground terminal. The first switch / the second switch can be closed so that the first resistor module is connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged to the ground terminal, so as to play a role of voltage division, pull down the potential difference between the positive electrode / negative electrode of the battery to be charged and the ground terminal, reduce the voltage of the power supply terminal, and improve the success rate of starting charging of the battery to be charged.

[0023] In some embodiments, the first pressure relief unit and the second pressure relief unit both further include: a second resistor module, the second resistor module of the first pressure relief unit is connected in parallel with the first resistor module of the first pressure relief unit, the second resistor module of the second pressure relief unit is connected in parallel with the first resistor module of the second pressure relief unit, and the voltage to ground of the positive electrode of the battery to be charged is discharged further including: closing the first switch so that the first resistor module and the second resistor module connected in parallel are connected between the positive electrode of the battery to be charged and the ground terminal; the voltage to ground of the negative electrode of the battery to be charged is discharged further including: closing the second switch so that the first resistor module and the second resistor module connected in parallel are connected between the negative electrode of the battery to be charged and the ground terminal. That is, the branch after the first resistor module and the second resistor module are connected in parallel is then connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged to the ground terminal. Since the resistance of the branch after the first resistor module and the second resistor module are connected in parallel is smaller than the resistance of the branch where only the first resistor module is located, the potential difference between the positive electrode / negative electrode of the battery to be charged and the ground terminal can be further lowered, thereby further reducing the voltage of the power supply terminal, greatly improving the success rate of starting charging of the battery to be charged.

[0024] In some embodiments, discharging the voltage of the positive electrode of the battery to be charged to the ground further includes: closing the first switch and the second switch so that the first pressure relief unit connects the positive electrode of the battery to be charged to the ground, and the second pressure relief unit connects the negative electrode of the battery to be charged to the ground; controlling the equivalent resistance of the first pressure relief unit to be smaller than the equivalent resistance of the second pressure relief unit to discharge the voltage of the positive electrode of the battery to be charged to the ground; discharging the voltage of the negative electrode of the battery to be charged to the ground further includes: closing the first switch and the second switch so that the first pressure relief unit connects the positive electrode of the battery to be charged to the ground, and the second pressure relief unit connects the negative electrode of the battery to be charged to the ground; controlling the equivalent resistance of the second pressure relief unit to be smaller than the equivalent resistance of the first pressure relief unit to discharge the voltage of the negative electrode of the battery to be charged to the ground. In this way, the first pressure relief unit or the second pressure relief unit with a smaller equivalent resistance has a smaller divided voltage, which can lower the voltage to ground of the positive / negative electrode of the battery to be charged connected to the first pressure relief unit or the second pressure relief unit with a smaller equivalent resistance, so that no matter whether the first pressure relief unit or the second pressure relief unit is turned on individually or together, it can play the effect of lowering the voltage of the power supply end, thereby simplifying the control of the circuit.

[0025] In some embodiments, the first pressure relief unit and the second pressure relief unit both include: a first resistor module and a second resistor module. In the first pressure relief unit, the first resistor module is connected in series with the first switch, and the second resistor module is connected in parallel with the first resistor module. In the second pressure relief unit, the first resistor module is connected in series with the second switch, and the second resistor module is connected in parallel with the first resistor module. The first pressure relief unit also includes: a third switch, which is connected in series with the second resistor module of the first pressure relief unit and in parallel with the first resistor module of the first pressure relief unit. The second pressure relief unit also includes: a fourth switch, which is connected in series with the second resistor module of the second pressure relief unit and in parallel with the first resistor module of the second pressure relief unit. Discharging the voltage of the positive electrode of the rechargeable battery to the ground includes: closing the first switch and the second switch; closing the third switch; discharging the voltage of the negative electrode of the rechargeable battery to the ground includes: closing the first switch and the second switch; closing the fourth switch. Since the first pressure relief unit and the second pressure relief unit have the same structure, the alternating conduction of the third switch and the fourth switch can realize the conversion of the magnitude relationship of the equivalent resistance values ​​of the first pressure relief unit and the second pressure relief unit, so that the voltage of the positive electrode of the rechargeable battery to the ground and the voltage of the negative electrode of the rechargeable battery to the ground can be discharged respectively.

[0026] In some embodiments, the discharge circuit further includes: a fifth switch and a third resistor module connected in series between the positive electrode of the battery to be charged and the negative electrode of the power supply end; a sixth switch and a fourth resistor module connected in series between the negative electrode of the battery to be charged and the positive electrode of the power supply end; discharging the voltage of the positive electrode of the battery to be charged to the ground further includes: closing the sixth switch so that the two ends of the fourth resistor module are respectively electrically connected to the negative electrode of the battery to be charged and the positive electrode of the power supply end; discharging the voltage of the negative electrode of the battery to be charged to the ground further includes: closing the fifth switch so that the two ends of the third resistor module are respectively electrically connected to the positive electrode of the battery to be charged and the negative electrode of the power supply end. By turning on the third resistor module and the fourth resistor module respectively, when the pressure relief module discharges the voltage of the negative electrode and the positive electrode of the battery to be charged to the ground respectively, a bridge structure can be formed between the charging end and the battery to be charged together with the ground end, so that the potential difference between the power supply end and the ground end tends to be balanced, so that the voltage of the power supply end is 0V or close to 0V, which greatly improves the success rate of starting charging of the battery to be charged.

[0027] In some embodiments, the pressure relief module further includes: a seventh switch and a fifth resistor module connected in series between the positive electrode of the battery to be charged and the ground terminal, and / or an eighth switch and a sixth resistor module connected in series between the negative electrode of the battery to be charged and the ground terminal, and discharging the voltage of the positive electrode of the battery to be charged to the ground further includes: closing the seventh switch; and / or, discharging the voltage of the negative electrode of the battery to be charged to the ground further includes: closing the eighth switch. The fifth resistor or the sixth resistor can play a role of voltage division, thereby further lowering the voltage of the power supply end and improving the success rate of starting charging of the battery to be charged.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0030] Figure 1 This is one of the schematic diagrams of the circuit structure of the connection between the battery and the power supply terminal in some embodiments of the present application;

[0031] Figure 2 The second schematic diagram of the circuit structure of the connection between the battery and the power supply terminal in some embodiments of the present application;

[0032] Figure 3The third circuit structure diagram of the connection between the battery and the power supply terminal in some embodiments of the present application;

[0033] Figure 4 for Figure 1 Schematic diagram of the equivalent circuit;

[0034] Figure 5 for Figure 2 Schematic diagram of the equivalent circuit;

[0035] Figure 6 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0036] Figure 7 This is one of the structural schematic diagrams of the discharge circuit in some embodiments of the present application;

[0037] Figure 8 This is the second structural schematic diagram of the discharge circuit in some embodiments of the present application;

[0038] Fig. 9 This is a third structural schematic diagram of the discharge circuit of some embodiments of the present application;

[0039] Fig.10 This is a fourth structural schematic diagram of the discharge circuit of some embodiments of the present application;

[0040] Fig.11 This is a fifth structural diagram of the discharge circuit of some embodiments of the present application;

[0041] Fig.12 This is a sixth structural diagram of the discharge circuit of some embodiments of the present application;

[0042] Fig.13 This is the seventh structural diagram of the discharge circuit of some embodiments of the present application;

[0043] Fig.14 This is an eighth structural schematic diagram of the discharge circuit of some embodiments of the present application;

[0044] Fig.15 This is a ninth structural diagram of a discharge circuit in some embodiments of the present application;

[0045] Fig.16 This is a tenth structural diagram of the discharge circuit of some embodiments of the present application;

[0046] Fig.17 This is a structural schematic diagram eleven of the discharge circuits of some embodiments of the present application;

[0047] Fig.18 This is a twelfth structural diagram of a discharge circuit in some embodiments of the present application;

[0048] Fig.19This is the thirteenth structural diagram of the discharge circuit of some embodiments of the present application;

[0049] Fig. 20 This is a fourteenth structural diagram of a discharge circuit in some embodiments of the present application;

[0050] Fig.21 The fifteenth structural diagram of the discharge circuit of some embodiments of the present application;

[0051] Fig. 22 This is a sixteenth structural diagram of the discharge circuit of some embodiments of the present application;

[0052] Fig.23 This is one of the flow charts of the battery charging control method in some embodiments of the present application;

[0053] Fig.24 This is a second flowchart of a battery charging control method according to some embodiments of the present application;

[0054] Fig.25 This is a third flowchart of a battery charging control method according to some embodiments of the present application;

[0055] Fig.26 This is a fourth flowchart of a battery charging control method according to some embodiments of the present application;

[0056] Fig. 27 This is a fifth flowchart of a battery charging control method according to some embodiments of the present application;

[0057] Fig.28 This is a sixth flowchart of a battery charging control method according to some embodiments of the present application;

[0058] Fig.29 This is a seventh flowchart of a battery charging control method according to some embodiments of the present application;

[0059] Fig.30 This is the eighth flowchart of the battery charging control method according to some embodiments of the present application.

[0060] Description of reference numerals:

[0061] Vehicle 1000, a first pressure relief unit 1031, a first resistance module 1031a, a second resistance module 1031b, a second pressure relief unit 1032, a third resistance module 1033, and a fourth resistance module 1034;

[0062] Battery 100, battery to be charged 101, charging module 102, pressure relief module 103;

[0063] Controller 200;

[0064] Motor 300;

[0065] Box body 10, first part 11, second part 12;

[0066] A first resistor r1, a second resistor r2, a third resistor r3, a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4. DETAILED DESCRIPTION

[0067] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0069] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0070] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0071] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0072] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0073] According to the provisions of the national standard safety documents, the voltage at the power supply end will be detected and judged before charging. If the voltage is above the preset voltage threshold (for example, 10V or 60V), charging will fail.

[0074] Analysis found that one of the reasons that causes the voltage at the power supply end to be greater than the preset voltage threshold is that when the power supply end is connected to the battery to be charged, a virtual voltage is generated at the power supply end, and the existence of this virtual voltage causes the measured voltage at the power supply end to be too large. One of the reasons for the virtual voltage is that when the positive and negative electrodes of the battery to be charged are connected to the power supply end, the power supply end forms a potential loop between the ground terminal and the positive or negative electrode of the battery to be charged, and the battery to be charged forms a virtual voltage at both ends of the power supply end through the potential loop.

[0075] Further analysis revealed that one of the reasons for the potential loop is that different circuits are usually designed on the electrical device (such as a vehicle), such as a boost module. The boost module is used to increase the voltage inside the electrical device after the battery is connected to the power supply terminal to improve the charging efficiency of the battery. However, due to the existence of these different circuits, especially the boost module as a high-voltage component, there will be a path between the positive / negative electrode of the battery to be charged and the ground terminal, and the insulation resistance between the positive / negative electrode of the battery to be charged and the ground terminal is usually large. For example, for a vehicle, there is a path between the battery on the vehicle and the body ground. The electrical connection of different circuits connected to the battery in the electrical device will present an equivalent impedance, which may form an electrical connection with the positive or negative electrode of the battery to be charged. When the battery on the vehicle is connected to the power supply terminal, there is also a path between the power supply terminal and the ground terminal, which may cause the power supply terminal to form a potential loop connected to the positive / negative electrode of the battery to be charged through the ground terminal and the equivalent impedance.

[0076] It is worth noting that the equivalent impedance referred to here may be the overall impedance presented by the electrical connection of different circuits, rather than an actual existing resistance element, and the value of the equivalent impedance may be measured by methods known to those skilled in the art for measuring equivalent impedance, including but not limited to the use of voltammetry, substitution method, half-bias method, and direct measurement with an ohmmeter. The embodiments of the present application do not limit the specific circuits that form equivalent impedance at the positive or negative electrode of the battery, and any circuit in the electrical device that is electrically connected to the battery may result in the generation of equivalent impedance.

[0077] The following will be combined Figures 1 to 5 The potential circuits are described in further detail.

[0078] like Figure 1 as well as Figure 2 As shown, Figure 1 The potential loop in which the power supply terminal is connected to the positive electrode of the battery to be charged through the ground terminal and the equivalent impedance is shown in FIG. Figure 2It shows that the power supply terminal forms a potential loop connected to the negative electrode of the battery to be charged through the ground terminal and the equivalent impedance.

[0079] refer to Figure 1 After the battery 101 to be charged is connected to the power supply end of the power supply module 101, the main positive relay MAIN+ and the main negative relay MAIN- are closed, and the first relay K1 and the second relay K2 are closed to achieve the connection between the power supply end and the battery 101 to be charged. The third relay K3 and the fourth relay K4 in the power supply module are turned off. At this time, the power supply module has not yet supplied power to the battery 101 to be charged. When the battery 101 to be charged meets the charging conditions, the third relay K3 and the fourth relay K4 are closed to start charging.

[0080] DC+ indicates the positive pole of the charging terminal, DC- indicates the negative pole of the charging terminal. Figure 1 In the figure, DC+ and DC- are shown in the form of switches, and the switches are in the form of disconnection, indicating that when charging is not started, the current of the charging module has not yet reached the positive and negative electrodes of the charging terminal. After charging is started, the switches of DC+ and DC- are in the form of closing. In other words, DC+ and DC- are shown in the form of switches, which are only used to indicate whether the charging module starts charging the rechargeable battery 101, and are not actual switches.

[0081] The first positive electrode insulation resistor Rp1 and the second positive electrode insulation resistor Rp2 are equivalent insulation resistances of the positive electrode of the battery to be charged 101 relative to the ground terminal GND, the first negative electrode insulation resistor Rn1 and the second negative electrode insulation resistor Rn2 are equivalent insulation resistances of the negative electrode of the battery to be charged 101 relative to the ground terminal GND, the first positive electrode insulation resistor Rp1 and the second positive electrode insulation resistor Rp2 are connected in parallel, and the first negative electrode insulation resistor Rn1 and the second negative electrode insulation resistor Rn2 are connected in parallel. The first positive electrode capacitor Y1 and the second positive electrode capacitor Y3 are equivalent capacitances of the positive electrode of the battery to be charged 101 relative to the ground terminal GND, the first positive electrode capacitor Y1 is connected in parallel to both ends of the first positive electrode insulation resistor Rp1, and the second positive electrode capacitor Y3 is connected in parallel to both ends of the second positive electrode insulation resistor Rp2. The capacitor X1 is an X capacitor, which is mainly a parasitic capacitor inside the battery to be charged 101. The first negative electrode capacitor Y2 and the second negative electrode capacitor Y4 are equivalent capacitances of the negative electrode of the battery to be charged 101 relative to the ground GND. The first negative electrode capacitor Y2 is connected in parallel to both ends of the first negative electrode insulation resistor Rn1, and the second negative electrode capacitor Y4 is connected in parallel to both ends of the second negative electrode insulation resistor Rn2.

[0082] In some embodiments, Figure 3As shown, the insulation resistance of the positive electrode of the battery to be charged 101 relative to the ground terminal GND may also be only the first positive electrode insulation resistance Rp1, and the capacitance of the positive electrode of the battery to be charged 101 relative to the ground terminal GND may also be only the first positive electrode capacitance Y1. The insulation resistance of the negative electrode of the battery to be charged 101 relative to the ground terminal GND may also be only the first negative electrode insulation resistance Rn1, and the capacitance of the negative electrode of the battery to be charged 101 relative to the ground terminal GND may also be only the first negative electrode capacitance Y2.

[0083] Continue to refer Figure 1 , the third positive electrode insulation resistance Rp3 is the equivalent insulation resistance of the positive electrode of the power supply terminal relative to the ground terminal GND, and the third negative electrode insulation resistance Rn3 is the equivalent insulation resistance of the negative electrode of the power supply terminal relative to the ground terminal GND. In some embodiments, in order to facilitate the detection of the voltage of the power supply terminal, a sampling resistor R2 is further provided, and the sampling resistor R2 is connected between the positive and negative electrodes of the power supply terminal. The voltage at both ends of the sampling resistor R2 is sampled to obtain the voltage at both ends of the power supply terminal.

[0084] Since there are paths between the positive and negative electrodes of the battery to be charged 101 and the positive and negative electrodes of the power supply end and the ground GND, the ground GND is connected to the node between the first positive electrode insulation resistor Rp1 and the first negative electrode insulation resistor Rn1, the node between the second positive electrode insulation resistor Rp2 and the second negative electrode insulation resistor Rn2, and the node between the third positive electrode insulation resistor Rp3 and the third negative electrode insulation resistor Rn3. The equivalent impedance R1 is connected to the positive electrode of the battery to be charged 101, and when the main positive relay MAIN+, the main negative relay MAIN-, the first relay K1 and the second relay K2 are closed, the sampling resistor R2 of the power supply end forms a potential loop with the positive electrode of the battery to be charged 101 through the ground GND and the equivalent impedance R1.

[0085] It is worth noting that the first positive electrode insulation resistance Rp1 and the second positive electrode insulation resistance Rp2 referred to in the embodiment of the present application are equivalent resistances formed by the insulation resistance of the positive electrode of the battery to be charged 101 relative to the ground terminal GND, the first negative electrode insulation resistance Rn1 and the second negative electrode insulation resistance Rn2 are equivalent resistances formed by the insulation resistance of the negative electrode of the battery to be charged 101 relative to the ground terminal GND, the third positive electrode insulation resistance Rp3 and the third negative electrode insulation resistance Rn3 are equivalent resistances formed by the insulation resistance of the positive electrode and the negative electrode of the power supply terminal relative to the ground terminal GND, respectively, rather than real resistance elements. The first positive electrode capacitor Y1 and the second positive electrode capacitor Y3 are equivalent capacitances between the positive electrode of the battery to be charged 101 and the ground terminal GND, and the first negative electrode capacitor Y2 and the second negative electrode capacitor Y4 are equivalent capacitances between the negative electrode of the battery to be charged 101 and the ground terminal GND, rather than real capacitance elements.

[0086] like Figure 4As shown, Figure 4 for Figure 1 Schematic diagram of an equivalent circuit. Among them, the equivalent positive electrode insulation resistance Rp and the equivalent negative electrode insulation resistance Rn are respectively the equivalent resistance of the first positive electrode insulation resistance Rp1 and the second positive electrode insulation resistance Rp2 of the battery to be charged 101 in parallel, and the equivalent resistance of the first negative electrode insulation resistance Rn1 and the second negative electrode insulation resistance Rn2 in parallel. The equivalent positive electrode capacitance Y1' and the equivalent negative electrode capacitance Y2' are respectively the equivalent capacitance of the first positive electrode capacitance Y1 and the second positive electrode capacitance Y3 in parallel, and the equivalent capacitance of the first negative electrode capacitance Y2 and the second negative electrode capacitance Y4 in parallel. The sampling resistor R2 is connected in series with the third negative electrode insulation resistance Rn3 of the power supply end, and then connected in parallel with the third positive electrode insulation resistance Rp3 of the power supply end, and the third positive electrode insulation resistance Rp3 of the power supply end is connected in parallel with the equivalent positive electrode insulation resistance Rp of the battery to be charged 101.

[0087] It is not difficult to find that the greater the voltage across the equivalent positive electrode insulation resistance Rp of the battery to be charged 101, the greater the voltage across the sampling resistor R2, resulting in a greater voltage at the power supply end detected. The voltage of the equivalent positive electrode insulation resistance Rp of the battery to be charged 101 is the voltage of the positive electrode of the battery to be charged 101 to ground.

[0088] refer to Figure 2 , the equivalent impedance R1 is connected to the negative electrode of the battery to be charged 101 , and the sampling resistor R2 at the power supply end forms a potential loop with the negative electrode of the battery to be charged 101 through the ground terminal GND and the equivalent impedance R1 .

[0089] like Figure 5 As shown, Figure 5 for Figure 2 The sampling resistor R2 is connected in series with the third positive electrode insulation resistor Rp3 of the power supply end, and then connected in parallel with the third negative electrode insulation resistor Rn3 of the power supply end. The third negative electrode insulation resistor Rn3 of the power supply end is connected in parallel with the equivalent negative electrode insulation resistor Rn of the battery to be charged 101.

[0090] The greater the voltage across the equivalent negative electrode insulation resistance Rn of the battery to be charged 101, the greater the voltage across the sampling resistor R2, resulting in a greater voltage at the power supply end. The voltage across the equivalent negative electrode insulation resistance Rn of the battery to be charged 101 is the voltage of the negative electrode of the battery to be charged 101 to ground.

[0091] From the above analysis, it can be seen that even if there is no actual resistance element connected between the battery to be charged 101 and the ground terminal GND and between the power supply terminal and the ground terminal GND, a potential loop will be formed due to the equivalent impedance presented by the electrical connection between the path between the battery to be charged 101 and the power supply terminal and the ground terminal GND and other circuits inside the electrical device. And in this potential loop, the voltage of the power supply terminal is related to the voltage of the positive electrode of the battery to be charged 101 to the ground and the voltage of the negative electrode to the ground. The greater the voltage of the positive electrode / negative electrode of the battery to be charged 101 to the ground, the greater the voltage of the power supply terminal.

[0092] Based on the above considerations, in order to improve the success rate of battery startup charging, a discharge circuit for battery charging is designed, the circuit comprising: a pressure relief module, configured to connect the positive electrode of the battery to be charged 101 and the ground terminal GND, and / or connect the negative electrode of the battery to be charged 101 and the ground terminal GND, so as to discharge the voltage of the positive electrode of the battery to be charged 101 to the ground or the voltage of the negative electrode of the battery to be charged 101 to the ground connected thereto.

[0093] By setting up the pressure relief module, the potential difference between the positive / negative electrode of the battery and the ground terminal GND can be greatly reduced. In this way, after the positive and negative electrodes of the battery to be charged 101 are connected to the power supply terminal of the power supply module, even if the positive or negative electrode of the battery to be charged 101 may form a potential loop through the ground terminal GND and the power supply terminal, resulting in the branch where the power supply terminal is located in the potential loop being connected in parallel with the branch from the positive / negative electrode of the battery to be charged 101 to the ground terminal GND, the potential difference between the positive / negative electrode of the battery to be charged 101 and the ground terminal GND is greatly reduced, and the potential difference between the two ends of the branch where the power supply terminal is located is also pulled down accordingly, thereby reducing the voltage of the power supply terminal, so that the voltage of the power supply terminal can be lower than the preset voltage threshold, thereby improving the success rate of starting charging of the battery to be charged 101.

[0094] The discharge circuit for battery charging and discharging disclosed in the embodiments of the present application can be used, but not limited to, for charging batteries in electrical devices such as vehicles, ships or aircraft.

[0095] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0096] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0097] Please refer to Figure 6 , Figure 6A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0098] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0099] The present application embodiment provides a discharge circuit for battery charging, such as Figure 7 As shown, it includes: a pressure relief module 103, which is configured to connect the positive electrode of the battery to be charged 101 and the ground terminal GND, and / or connect the negative electrode of the battery to be charged 101 and the ground terminal GND, so as to discharge the ground voltage of the positive electrode of the battery to be charged 101 or the ground voltage of the negative electrode of the battery to be charged 101 connected thereto; wherein the positive electrode and the negative electrode of the battery to be charged 101 are connected to the power supply end of the power supply module 102.

[0100] Discharging the voltage of the positive / negative electrode of the battery to be charged 101 to the ground here refers to lowering the potential difference between the positive / negative electrode of the battery to be charged 101 and the ground terminal GND, so that the voltage of the positive / negative electrode of the battery to be charged 101 to the ground is 0V or close to 0V.

[0101] The actual voltage of the ground terminal GND can be set according to the working scenario and requirements of the discharge circuit. In some embodiments, the voltage of the ground terminal GND can be regarded as relative to 0V. For example, if the actual voltage of the ground terminal GND is 6V, and the actual measured voltage of the positive / negative pole of the battery to be charged 101 is 22V, the voltage of the ground terminal GND can be recorded as 0V, and the actual measured voltage of the positive / negative pole of the battery to be charged 101 can be recorded as 16V. In this way, the actual measured voltage of the positive / negative pole of the battery to be charged 101 is 16V, which is the voltage of the positive / negative pole of the battery to be charged 101 to the ground.

[0102] The pressure relief module 103 can be used to connect the positive electrode of the battery to be charged 101 and the ground terminal GND, and the pressure relief module 103 connected between the positive electrode of the battery to be charged 101 and the ground terminal GND can discharge the voltage of the positive electrode of the battery to be charged 101 to the ground.

[0103] The pressure relief module 103 can also be used to connect the negative electrode of the battery to be charged 101 and the ground terminal GND, and the pressure relief module 103 connected between the negative electrode of the battery to be charged 101 and the ground terminal GND can discharge the voltage of the negative electrode of the battery to be charged 101 to the ground.

[0104] The pressure relief module 103 can also be used to connect the positive electrode of the battery to be charged 101 and the ground terminal GND, connect the negative electrode of the battery to be charged 101 and the ground terminal GND, and discharge the voltage of the positive electrode or negative electrode of the battery to be charged 101 to the ground.

[0105] The positive and negative electrodes of the battery to be charged 101 are connected to the power supply end of the power supply module 102, which means that the positive electrode of the battery to be charged 101 is connected to the positive electrode of the power supply end, and the negative electrode of the battery to be charged 101 is connected to the negative electrode of the power supply end. In some embodiments, the power supply module 102 may include but is not limited to a device such as a charging pile that can provide energy to the battery, and the power supply end may be a charging port of a charging pile or the like.

[0106] In the above technical solution, by setting up the pressure relief module 103, the voltage of the positive electrode to the ground or the voltage of the negative electrode to the ground of the battery to be charged 101 connected thereto is discharged, which can greatly reduce the potential difference between the positive electrode / negative electrode of the battery and the ground terminal GND, thereby reducing the voltage of the power supply end, so that the voltage of the power supply end can be lower than the preset voltage threshold, thereby improving the success rate of starting charging of the battery to be charged 101.

[0107] like Figure 8 and Fig. 9 As shown, according to some embodiments of the present application, the pressure relief module 103 includes: a first pressure relief unit 1031, a first end of the first pressure relief unit 1031 is connected to the positive / negative electrode of the battery to be charged 101, a second end of the first pressure relief unit 1031 is connected to the ground terminal GND, the first pressure relief unit 1031 includes a first switch S1, the first switch S1 is configured to be able to close so that the first pressure relief unit 1031 connects the ground terminal GND and the positive / negative electrode of the battery to be charged 101, and the first pressure relief unit 1031 is configured to be able to discharge the voltage of the positive / negative electrode connected thereto to the ground.

[0108] refer to Figure 8 The first end of the first pressure relief unit 1031 can be connected to the positive electrode of the battery to be charged 101, wherein the first switch S1 can be connected to the positive electrode of the battery to be charged 101, and can also be connected to the ground terminal GND.

[0109] refer to Fig. 9 The first end of the first pressure relief unit 1031 may also be connected to the negative electrode of the battery to be charged 101, wherein the first switch S1 may be connected to the negative electrode of the battery to be charged 101, or may be connected to the ground terminal GND.

[0110] In some embodiments, the first switch S1 may be any switch element including but not limited to a relay, a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube, etc., which can control the on-off of a circuit.

[0111] Before designing the circuit, the formation position of the equivalent impedance can be detected. If the equivalent impedance is more likely to be formed at the positive electrode of the battery to be charged 101, it is easier for the power supply end to form a potential loop with the positive electrode of the battery to be charged 101, and the first pressure relief unit 1031 can be connected to the positive electrode of the battery to be charged 101. Otherwise, the first pressure relief unit 1031 can be connected to the negative electrode of the battery to be charged 101. That is, the first pressure relief unit 1031 is designed according to the formation position of the potential loop, which can simplify the circuit structure.

[0112] In the above technical solution, it is possible to close the first switch S1 only before detecting the voltage at the power supply end to reduce the voltage at the power supply end and improve the success rate of starting charging of the battery to be charged 101. After the battery to be charged 101 starts charging, the first switch is disconnected, which will not affect the normal charging of the battery and improve the reliability of battery charging.

[0113] like Fig.10 as well as Fig.11 As shown, according to some embodiments of the present application, the first pressure relief unit 1031 includes: a first resistance module 1031a, the first resistance module 1031a is connected in series with a first switch S1, and the first switch S1 is configured to be closed so that the two ends of the first resistance module 1031a are electrically connected to the ground GND and the positive / negative pole of the battery to be charged 101, respectively.

[0114] like Fig.10 As shown, in some embodiments, the first pressure relief unit is connected to the positive electrode of the battery to be charged, and the first resistance module 1031a and the first switch S1 connected in series can be connected between the positive electrode of the battery to be charged 101 and the ground terminal GND.

[0115] If a potential loop is formed between the power supply end and the positive electrode of the battery to be charged 101, by closing the first switch S1, the first resistance module 1031a can be connected in parallel with the equivalent positive electrode insulation resistance Rp of the battery to be charged 101, and the overall resistance of the first resistance module 1031a and the equivalent positive electrode insulation resistance Rp after parallel connection is reduced, thereby reducing the voltage division between the two ends of the battery to be charged 101 at the two ends of the equivalent positive electrode insulation resistance Rp, thereby reducing the voltage of the positive electrode of the battery to be charged 101 to the ground.

[0116] like Fig.11 As shown, in some embodiments, the first pressure relief unit is connected to the negative electrode of the battery to be charged, and the first end of the first resistance module 1031a connected in series can be connected between the negative electrode of the battery to be charged 101 and the ground terminal GND.

[0117] If a potential loop is formed between the power supply end and the negative electrode of the battery to be charged 101, by closing the first switch S1, the first resistance module 1031a can be connected in parallel with the equivalent negative electrode insulation resistance Rn of the battery to be charged 101, and the overall resistance of the first resistance module 1031a and the equivalent negative electrode insulation resistance Rn after parallel connection is reduced, thereby reducing the voltage division between the two ends of the battery to be charged 101 at the two ends of the equivalent negative electrode insulation resistance Rn, thereby reducing the voltage of the negative electrode of the battery to be charged 101 to the ground.

[0118] In some embodiments, the first resistance module 1031 a may include only one first resistor.

[0119] In some other embodiments, the first resistor module 1031a may also include a resistor string, which includes at least a first resistor and a second resistor connected in series.

[0120] In some embodiments, the equivalent resistance of the first resistance module 1031a can be smaller than the resistance of the equivalent positive electrode insulation resistance Rp and the resistance of the equivalent negative electrode insulation resistance Rn, so that after the first resistance module 1031a is connected in parallel with the equivalent positive electrode insulation resistance Rp or the equivalent negative electrode insulation resistance Rn, the voltage divided across the equivalent positive electrode insulation resistance Rp or the equivalent negative electrode insulation resistance Rn connected in parallel can be greatly reduced.

[0121] The equivalent resistance of the first resistance module 1031 a refers to the resistance of the first resistance module 1031 a as a whole.

[0122] In some embodiments, a multimeter or an insulation resistance tester can be used to detect the resistance of the equivalent positive insulation resistance Rp and the resistance of the equivalent negative insulation resistance Rn, and then the resistance of the first resistance module 1031a can be set based on the resistance of the equivalent positive insulation resistance Rp and the resistance of the equivalent negative insulation resistance Rn.

[0123] In the above technical solution, the first switch S1 can be closed so that the first resistor module 1031a is connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged 101 to the ground terminal GND, so as to play a role of voltage division, reduce the potential difference between the positive electrode / negative electrode of the battery to be charged 101 and the ground terminal GND, reduce the voltage of the power supply end, and improve the success rate of starting charging of the battery to be charged 101.

[0124] like Fig.12 As shown, according to some embodiments of the present application, the first pressure relief unit 1031 also includes: a second resistance module 1031b, which is connected in parallel with the first resistance module 1031a, and the first switch S1 is configured to be able to be closed so that the first resistance module 1031a and the second resistance module 1031b are connected in parallel between the ground terminal GND and the positive electrode / negative electrode of the battery to be charged 101.

[0125] As an indication, Fig.12 FIG. 4 illustrates a case where the first pressure relief unit 1031 is connected between the positive electrode of the battery to be charged 101 and the ground terminal GND, and the second resistance module 1031 b is connected in parallel with the first resistance module 1031 a.

[0126] A first end of the second resistance module 1031 b may be connected to a first end of the first resistance module 1031 a , and a second end of the second resistance module 1031 b may be connected to a second end of the first resistance module 1031 a .

[0127] like Fig.13 As shown, in some embodiments, the second resistance module 1031b may include only one third resistor r3. The first resistance module 1031a may include a first resistor r1 and a second resistor r2 connected in series, and the third resistor r3 is connected in parallel with the first resistor r1 and the second resistor r2 connected in series, so as to reduce the equivalent resistance of the first pressure relief unit 1031, thereby further reducing the positive / negative voltage of the battery to be charged 101 to the ground.

[0128] In some other embodiments, the second resistor module 1031b may also include a resistor string, and the resistor string may include at least two resistors connected in series.

[0129] In some embodiments, the equivalent resistance of the second resistance module 1031b may be smaller than the resistance of the equivalent positive electrode insulation resistor Rp and the resistance of the equivalent negative electrode insulation resistor Rn.

[0130] In some embodiments, the equivalent resistance of the second resistance module 1031 b may be smaller than the equivalent resistance of the first resistance module 1031 a .

[0131] In some other embodiments, the equivalent resistance of the second resistance module 1031b may also be equal to the equivalent resistance of the first resistance module 1031a.

[0132] In some other embodiments, the equivalent resistance of the second resistance module 1031b may also be greater than the equivalent resistance of the first resistance module 1031a.

[0133] The definition of the equivalent resistance of the second resistance module 1031 b may refer to the above description of the definition of the equivalent resistance of the first resistance module 1031 a , which will not be repeated below.

[0134] In the above technical solution, the branch after the first resistor module 1031a and the second resistor module 1031b are connected in parallel is then connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged 101 to the ground terminal GND. Since the resistance of the branch after the first resistor module 1031a and the second resistor module 1031b are connected in parallel is smaller than the resistance of the branch where only the first resistor module 1031a is located, the potential difference between the positive electrode / negative electrode of the battery to be charged 101 and the ground terminal GND can be further lowered, thereby further reducing the voltage of the power supply end, greatly improving the success rate of starting charging of the battery to be charged 101.

[0135] According to some embodiments of the present application, the equivalent resistance of the second resistance module 1031 b is smaller than the equivalent resistance of the first resistance module 1031 a .

[0136] In some embodiments, the number of resistors included in the second resistance module 1031b may be smaller than the number of resistors included in the first resistance module 1031a, so that the equivalent resistance of the second resistance module 1031b is smaller than the equivalent resistance of the first resistance module 1031a.

[0137] In other embodiments, the number of resistors included in the second resistor module 1031b may be equal to the number of resistors included in the first resistor module 1031a, and the resistance value of each resistor in the second resistor module 1031b may be smaller than the resistance value of each resistor in the first resistor module 1031a.

[0138] In the above technical solution, a second resistance module 1031b with a smaller equivalent resistance is connected in parallel at both ends of the first resistance module 1031a, which can further reduce the resistance of the branch after the first resistance module 1031a and the second resistance module 1031b are connected in parallel, so that the potential difference between the positive electrode / negative electrode of the battery to be charged 101 and the ground terminal GND can be further lowered, so that the potential difference between the positive electrode / negative electrode of the battery to be charged 101 and the ground terminal GND is close to 0V, and then the voltage of the power supply end is also close to 0V, which greatly improves the success rate of starting charging of the battery to be charged 101.

[0139] like Fig.14 as well as Fig.15As shown, according to some embodiments of the present application, the pressure relief module 103 also includes: a second pressure relief unit 1032, the second pressure relief unit 1032 includes a second switch S2, wherein a first end of the second pressure relief unit 1032 is connected to the negative electrode of the battery to be charged 101, and a second end is connected to the ground terminal GND, and the second switch S2 is configured to be closed so that the second pressure relief unit 1032 connects the ground terminal GND and the negative electrode of the battery to be charged 101 to discharge the voltage of the negative electrode to the ground; a first end of the first pressure relief unit 1031 is connected to the positive electrode of the battery to be charged 101, and a second end is connected to the ground terminal GND.

[0140] That is, the first pressure relief unit 1031 and the second pressure relief unit 1032 are connected in series. By controlling the first switch S1 and the second switch S2 to be closed or opened, the first pressure relief unit 1031 and the second pressure relief unit 1032 can be controlled to be turned on simultaneously or alternately, so as to meet different pressure relief requirements.

[0141] The second switch can be connected to the negative electrode of the battery to be charged 101 or to the ground terminal GND. In some embodiments, the second switch can be any switch element including but not limited to a relay, a MOS tube, etc. that can control the on and off of a circuit.

[0142] In the above technical solution, the first pressure relief unit 1031 can discharge the voltage of the positive electrode of the rechargeable battery 101 to the ground, and the second pressure relief unit 1032 can discharge the voltage of the negative electrode of the rechargeable battery 101 to the ground, so that no matter whether the positive electrode or the negative electrode of the rechargeable battery 101 forms a potential loop between the ground terminal GND and the power supply terminal, the first pressure relief unit 1031 can be turned on by the first switch S1 or the second pressure relief unit 1032 can be turned on by the second switch to lower the voltage of the power supply terminal, thereby further improving the success rate of starting charging of the rechargeable battery 101.

[0143] According to some embodiments of the present application, the structure of the second pressure relief unit 1032 is the same as that of the first pressure relief unit 1031 .

[0144] In other words, when the first pressure relief unit 1031 includes the first resistance module 1031a, the second pressure relief unit 1032 may also include the first resistance module 1031a. Fig.16 as well as Fig.17 As shown, when the first pressure relief unit 1031 includes a first resistance module 1031a and a second resistance module 1031b, and the first resistance module 1031a and the second resistance module 1031b are connected in parallel, the second pressure relief unit 1032 may also include the first resistance module 1031a and the second resistance module 1031b connected in parallel.

[0145] The principle of the second pressure relief unit 1032 discharging the voltage of the positive electrode of the rechargeable battery 101 to the ground can be referred to the description of the principle of the first pressure relief unit 1031 discharging the voltage of the negative electrode of the rechargeable battery 101 to the ground, which will not be repeated below.

[0146] In the above technical solution, the structure of the second pressure relief unit 1032 is the same as that of the first pressure relief unit 1031, which can simplify the layout of the circuit, and through the first pressure relief unit 1031 and the second pressure relief unit 1032, the discharge effect of the positive electrode voltage to ground and the negative electrode voltage to ground of the battery to be charged 101 is consistent, and thus, no matter whether the positive electrode or the negative electrode of the battery to be charged forms a potential loop between the ground terminal GND and the power supply terminal, the voltage of the power supply terminal can be significantly lowered through the first pressure relief unit 1031 or the second pressure relief unit 1032, thereby improving the success rate of starting charging of the battery to be charged 101.

[0147] According to some embodiments of the present application, the first switch S1 and the second switch S2 are configured to be able to be closed in the same time period, and the equivalent resistance formed by the first pressure relief unit 1031 between the positive electrode of the battery to be charged 101 and the ground terminal GND is different from the equivalent resistance formed by the second pressure relief unit 1032 between the negative electrode of the battery to be charged 101 and the ground terminal GND.

[0148] The equivalent resistance of the conductive first pressure relief unit 1031 and the conductive second pressure relief unit 1032 referred to herein refers to the resistance presented by the conductive first pressure relief unit 1031 and the conductive second pressure relief unit 1032 as a whole.

[0149] like Fig.14 as well as Fig.16 As shown, the equivalent resistance of the turned-on first pressure relief unit 1031 can be smaller than the equivalent resistance of the turned-on second pressure relief unit 1032, so the divided voltage across the two ends of the battery to be charged 101 at the first pressure relief unit 1031 is smaller than the divided voltage across the two ends of the second pressure relief unit 1032, and when a potential loop is formed between the power supply end and the positive electrode of the battery to be charged 101, the voltage of the positive electrode of the battery to be charged 101 to the ground can be lowered.

[0150] like Fig.15 as well as Fig.17 As shown, the equivalent resistance of the turned-on first pressure relief unit 1031 can be greater than the equivalent resistance of the turned-on second pressure relief unit 1032, so the divided voltage at both ends of the battery to be charged 101 at the first pressure relief unit 1031 is greater than the divided voltage at both ends of the second pressure relief unit 1032, and when a potential loop is formed between the power supply end and the negative electrode of the battery to be charged 101, the voltage of the negative electrode of the battery to be charged 101 to the ground can be lowered.

[0151] In some embodiments, the structure of the first pressure relief unit 1031 and the structure of the second pressure relief unit 1032 may be different, so that the equivalent resistance of the first pressure relief unit 1031 and the equivalent resistance of the second pressure relief unit 1032 are different.

[0152] In other embodiments, the structure of the first pressure relief unit 1031 is the same as that of the second pressure relief unit 1032, and the first pressure relief unit 1031 and the second pressure relief unit 1032 both include at least two resistors connected in parallel, which respectively control the conduction conditions of the parallel resistors in the first pressure relief unit 1031 and the second pressure relief unit 1032 to be different, thereby controlling the equivalent resistance value of the first pressure relief unit 1031 to be different from the equivalent resistance value of the second pressure relief unit 1032.

[0153] In the above technical solution, the first pressure relief unit 1031 or the second pressure relief unit 1032 with a smaller equivalent resistance has a smaller divided voltage, which can lower the ground voltage of the positive / negative electrode of the battery 101 to be charged connected to the first pressure relief unit 1031 or the second pressure relief unit 1032 with a smaller equivalent resistance, so that no matter whether the first pressure relief unit 1031 or the second pressure relief unit 1032 is turned on individually or together, it can play the effect of lowering the voltage of the power supply end, thereby simplifying the control of the circuit.

[0154] like Fig.16 as well as Fig.17 As shown, according to some embodiments of the present application, the structure of the second pressure relief unit 1032 is the same as that of the first pressure relief unit 1031. When the first pressure relief unit 1031 includes a first resistance module 1031a and a second resistance module 1031b, the first pressure relief unit 1031 also includes: a third switch S3, the third switch S3 is connected in series with the second resistance module 1031b of the first pressure relief unit 1031, and is connected in parallel with the first resistance module 1031a of the second pressure relief unit 1032. The second pressure relief unit 1032 also includes: a fourth switch S4, the fourth switch S4 is connected in series with the second resistance module 1031b of the second pressure relief unit 1032, and is connected in parallel with the first resistance module 1031a of the second pressure relief unit 1032. The third switch S3 and the fourth switch S4 are configured such that: when one of them is closed, the other is disconnected.

[0155] That is, in the first pressure relief unit 1031, the third switch S3 and the second resistor module 1031b are connected in series and then connected in parallel with the first resistor module 1031a, and the first resistor module 1031a and the third switch S3 and the second resistor module 1031b connected in parallel are then connected in series with the first switch S1.

[0156] In the second pressure relief unit 1032, the fourth switch S4 and the second resistance module 1031b are connected in series and then connected in parallel with the first resistance module 1031a, and the first resistance module 1031a and the fourth switch S4 and the second resistance module 1031b connected in parallel are then connected in series with the second switch S2.

[0157] The first switch S1 and the third switch S3 may be controlled to be closed, and the second switch S2 and the fourth switch S4 may be controlled to be opened, so as to discharge the voltage of the positive electrode of the battery to be charged 101 to the ground.

[0158] The second switch S2 and the fourth switch S4 may also be controlled to be closed, and the first switch S1 and the third switch S3 may be opened, so as to discharge the voltage of the negative electrode of the battery to be charged 101 to the ground.

[0159] When the first switch S1, the second switch S2 and the third switch S3 are closed and the fourth switch S4 is opened, the first resistance module 1031a and the second resistance module 1031b in the first pressure relief unit 1031 are connected in parallel between the positive electrode of the battery to be charged 101 and the ground terminal GND, and the first resistance module 1031a in the second pressure relief unit 1032 is connected between the negative electrode of the battery to be charged 101 and the ground terminal GND, so that the equivalent resistance of the first pressure relief unit 1031 is smaller than the equivalent resistance of the second pressure relief unit 1032, so as to discharge the voltage of the positive electrode of the battery to be charged 101 to the ground.

[0160] When the first switch S1, the second switch S2 and the fourth switch S4 are closed and the third switch S3 is opened, the first resistor module 1031a in the first pressure relief unit 1031 is connected between the positive electrode of the battery to be charged 101 and the ground terminal GND, and the first resistor module 1031a and the second resistor module 1031b in the second pressure relief unit 1032 are connected in parallel between the negative electrode of the battery to be charged 101 and the ground terminal GND, so that the equivalent resistance of the first pressure relief unit 1031 is greater than the equivalent resistance of the second pressure relief unit 1032, so as to discharge the voltage of the negative electrode of the battery to be charged 101 to the ground.

[0161] like Fig.18 As shown, Fig.18 As an illustration, a situation is shown in which the first resistance module 1031a may include a first resistor r1 and a second resistor r2 connected in series, and the second resistance module 1031b may include a third resistor r3.

[0162] In some embodiments, the third switch S3 and the fourth switch S4 can be any switch element including but not limited to a relay, a MOS tube, etc. that can control the on and off of a circuit.

[0163] Since the first pressure relief unit 1031 and the second pressure relief unit 1032 have the same structure, the equivalent resistance of the first pressure relief unit 1031 and the second pressure relief unit 1032 can be converted by interleaving the third switch S3 and the fourth switch S4, so that the voltage to the ground of the positive electrode of the rechargeable battery 101 and the voltage to the ground of the negative electrode of the rechargeable battery 101 can be discharged respectively, thereby simplifying the circuit structure.

[0164] like Fig.19 as well as Fig. 20 As shown, according to some embodiments of the present application, the discharge circuit further includes: a fifth switch S5 and a third resistor module 1033 connected in series between the positive electrode of the battery to be charged 101 and the negative electrode of the power supply end, and the fifth switch S5 is configured to be closed during the closing period of the first switch S1, the second switch S2 and the fourth switch S4, so that the two ends of the third resistor module 1033 are respectively electrically connected to the positive electrode of the battery to be charged 101 and the negative electrode of the power supply end. The discharge circuit further includes: a sixth switch S6 and a fourth resistor module 1034 connected in series between the negative electrode of the battery to be charged 101 and the positive electrode of the power supply end, and the sixth switch S6 is configured to be closed during the closing period of the first switch S1, the second switch S2 and the third switch S3, so that the two ends of the fourth resistor module 1034 are respectively electrically connected to the negative electrode of the battery to be charged 101 and the positive electrode of the power supply end.

[0165] like Fig.19 As shown, when the equivalent impedance R1 is connected to the negative electrode of the battery to be charged 101, the third switch S3 is disconnected during the period when the first switch S1, the second switch S2, and the fourth switch S4 are closed, and the equivalent resistance of the second pressure relief unit 1032 is smaller than the equivalent resistance of the first pressure relief unit 1031, so that the voltage of the negative electrode of the battery to be charged 101 to the ground is smaller than 0.5 times the total voltage across the battery to be charged 101, and then by closing the fifth switch S5, a bridge structure is formed.

[0166] Fig.21 for Fig.19 Schematic diagram of the equivalent circuit.

[0167] like Fig.21As shown, the third resistance module 1033, the equivalent positive electrode insulation resistance Rp, the equivalent impedance R1, the equivalent negative electrode insulation resistance Rn, the third positive electrode insulation resistance Rp3 connected between the node between the equivalent positive electrode insulation resistance Rp and the equivalent negative electrode insulation resistance Rn and the node between the third resistance module 1033 and the equivalent impedance R1, the third negative electrode insulation resistance Rn3 and the sampling resistance R2 together constitute a bridge architecture. Among them, the third positive electrode insulation resistance Rp3 and the sampling resistance R2 are connected in series and then connected in parallel with the third negative electrode insulation resistance Rn3 between the node between the equivalent positive electrode insulation resistance Rp and the equivalent negative electrode insulation resistance Rn and the node between the third resistance module 1033 and the equivalent impedance R1.

[0168] When the bridge architecture reaches a balance, the potential difference from the node between the equivalent positive insulation resistor Rp and the equivalent negative insulation resistor Rn to the node between the third resistance module 1033 and the equivalent impedance R1 is 0V, that is, the two ends of the third negative insulation resistor Rn3 are at the same potential, so that the divided voltage across the sampling resistor R2 is 0V, and the measured voltage at the power supply end is 0V.

[0169] It can be understood that the node between the equivalent positive insulation resistor Rp and the equivalent negative insulation resistor Rn is connected to the ground terminal GND. When the potentials at both ends of the third negative insulation resistor Rn3 are equal, it is equivalent to balancing the potential difference between the power supply terminal and the ground terminal GND, so that the voltage at the power supply terminal is 0V.

[0170] According to the principle of bridge balance, when the voltage across the equivalent positive insulation resistor Rp is consistent with the voltage across the third resistance module 1033, and the voltage across the equivalent negative insulation resistor Rn is consistent with the voltage across the equivalent impedance R1, the bridge reaches balance.

[0171] In order to make the bridge architecture reach balance or tend to balance, the equivalent resistance of the first resistance module 1031a can be equal to or close to the equivalent resistance of the third resistance module 1033, and the equivalent resistance of the first resistance module 1031a and the second resistance module 1031b after being connected in parallel is equal to or close to the resistance of the equivalent impedance R1. In this way, the voltage at both ends of the first pressure relief unit 1031 is consistent with or close to the voltage at both ends of the third resistance module 1033, and the voltage at both ends of the second pressure relief unit 1032 is consistent with or close to the voltage at both ends of the equivalent impedance R1. Since the first pressure relief unit 1031 is connected in parallel with the equivalent positive electrode insulation resistor Rp, the voltage at both ends of the equivalent positive electrode insulation resistor Rp is consistent with or close to the voltage at both ends of the third resistance module 1033, and the second pressure relief unit 1032 is connected in parallel with the equivalent negative electrode insulation resistor Rn, so that the voltage at both ends of the negative electrode insulation resistor is consistent with or close to the voltage at both ends of the equivalent impedance R1.

[0172] In the first pressure relief unit 1031 connected in parallel to the equivalent positive electrode insulation resistor Rp, only the first resistance module 1031a is turned on, and in the second pressure relief unit 1032 connected in parallel to the equivalent negative electrode insulation resistor Rn, the first resistance module 1031a and the second resistance module 1031b are turned on after being connected in parallel.

[0173] In some embodiments, the first resistor module 1031a includes a first resistor r1 and a second resistor r2 connected in series, the second resistor module 1031b includes a third resistor r3, and the third resistor module 1033 may also include the first resistor r1. The resistance of the first resistor r1 is much greater than the resistance of the second resistor r2, so that the resistance of the first resistor r1 and the second resistor r2 connected in series is approximately equal to the resistance of the first resistor r1. Exemplarily, the resistance of the first resistor r1 may be 1000 times the resistance of the second resistor r2.

[0174] The resistance value of the third resistor r3 can be determined according to the resistance value of the equivalent impedance R1 and the resistance value of the first resistor r1 and the second resistor r2 connected in series, so that the equivalent resistance value of the first resistor r1 and the second resistor r2 connected in series and then in parallel with the third resistor r3 is equal to or approximately equal to the resistance value of the equivalent impedance R1.

[0175] like Fig. 20 As shown, when the equivalent impedance R1 is connected to the positive electrode of the battery to be charged 101, the first switch S1, the second switch S2, and the third switch S3 are closed, and the fourth switch S4 is disconnected. The equivalent resistance of the first pressure relief unit 1031 is smaller than the equivalent resistance of the second pressure relief unit 1032, so that the voltage of the positive electrode of the battery to be charged 101 to the ground is smaller than 0.5 times the total voltage across the battery to be charged 101, and then the sixth switch S6 is closed to form a bridge structure.

[0176] Fig. 22 for Fig. 20 Schematic diagram of the equivalent circuit.

[0177] like Fig. 22 As shown, the fourth resistance module 1034, the equivalent positive electrode insulation resistance Rp, the equivalent impedance R1, the equivalent negative electrode insulation resistance Rn, the third positive electrode insulation resistance Rp3 connected between the node between the equivalent positive electrode insulation resistance Rp and the equivalent negative electrode insulation resistance Rn and the node between the fourth resistance module 1034 and the equivalent impedance R1, the third negative electrode insulation resistance Rn3 and the sampling resistance R2 together constitute a bridge structure. Among them, the third negative electrode insulation resistance Rn3 and the sampling resistance R2 are connected in series and then connected in parallel with the third positive electrode insulation resistance Rp3 between the node between the equivalent positive electrode insulation resistance Rp and the equivalent negative electrode insulation resistance Rn and the node between the fourth resistance module 1034 and the equivalent impedance R1.

[0178] By balancing the bridge architecture, the potentials of both ends of the third positive electrode insulation resistor Rp3 are equal, so that the divided voltage across both ends of the sampling resistor R2 is 0V.

[0179] In such Fig. 22 In the circuit shown, when the voltage across the equivalent positive insulation resistor Rp is consistent with the voltage across the equivalent impedance R1, and the voltage across the equivalent negative insulation resistor Rn is consistent with the voltage across the fourth resistance module 1034, the bridge architecture reaches balance.

[0180] In the first pressure relief unit 1031 connected in parallel at both ends of the equivalent positive electrode insulation resistor Rp, the first resistance module 1031a and the second resistance module 1031b are connected in parallel and turned on, and in the second pressure relief unit 1032 connected in parallel at both ends of the equivalent negative electrode insulation resistor Rn, only the first resistance module 1031a is turned on.

[0181] The first resistance module 1031a includes a first resistor r1 and a second resistor r2 connected in series, and the second resistance module 1031b includes a third resistor r3. Since the equivalent resistance of the first resistor r1 and the second resistor r2 when connected in series and then in parallel with the third resistor r3 is equal to or approximately equal to the resistance of the equivalent impedance R1, the voltage value across the equivalent positive insulation resistance Rp is consistent or nearly consistent with the voltage value across the equivalent impedance.

[0182] The first resistor module 1031a includes a first resistor r1 and a second resistor r2 connected in series. Since the resistance of the first resistor r1 is much greater than the resistance of the second resistor r2, the resistance of the first resistor r1 and the second resistor r2 connected in series is approximately equal to the resistance of the first resistor r1. The fourth resistor module 1034 may also include the first resistor r1, so that the voltage across the equivalent negative electrode insulation resistor Rn is nearly consistent with the voltage across the fourth resistor module 1034.

[0183] It can be seen that the structures of the first resistance module 1031a and the second resistance module 1031b are suitable for forming a bridge structure when the equivalent impedance R1 is connected to the negative electrode of the battery 101 to be charged and the positive electrode of the battery 101 to be charged.

[0184] In some embodiments, the fifth switch S5 and the sixth switch S6 can be any switch element including but not limited to a relay, a MOS tube, etc. that can control the on and off of a circuit.

[0185] In the above technical solution, by respectively turning on the third resistor module 1033 and the fourth resistor module 1034, when the pressure relief module 103 discharges the voltage of the negative electrode and the positive electrode of the battery to be charged 101 to the ground respectively, a bridge structure is formed between the charging end and the battery to be charged 101 together with the ground terminal GND, so that the potential difference between the power supply end and the ground terminal GND tends to be balanced, so that the voltage of the power supply end is 0V or close to 0V, which greatly improves the success rate of starting charging of the battery to be charged 101.

[0186] Here, the voltage at the power supply end approaching 0V may be the voltage at the power supply end being no greater than 10V.

[0187] According to some embodiments of the present application, the pressure relief module 103 also includes: a seventh switch and a fifth resistor module connected in series between the positive electrode of the battery to be charged 101 and the ground terminal GND, and / or an eighth switch and a sixth resistor module connected in series between the negative electrode of the battery to be charged 101 and the ground terminal GND, the seventh switch is configured to be able to be closed to enable the pressure relief module to discharge the voltage of the positive electrode of the battery to be charged 101 to the ground, and the eighth switch is configured to be able to be closed to enable the pressure relief module to discharge the voltage of the negative electrode of the battery to be charged 101 to the ground.

[0188] In some embodiments, the first pressure release unit 1031 is connected between the positive electrode of the battery to be charged 101 and the ground terminal GND.

[0189] The pressure relief module 103 may include: a seventh switch and a fifth resistor module, and the seventh switch and the first switch S1 are controlled to be closed simultaneously, so that the fifth resistor module is connected in parallel with the first pressure relief unit 1031 .

[0190] Alternatively, the pressure relief module 103 may include an eighth switch and a sixth resistor module, and the eighth switch or the first switch S1 is controlled to be closed, so as to respectively lower the potential difference between the negative electrode or the positive electrode of the battery to be charged 101 and the ground terminal GND.

[0191] In some other embodiments, the first pressure release unit 1031 is connected between the negative electrode of the battery to be charged 101 and the ground terminal GND.

[0192] The pressure relief module 103 may include: a seventh switch and a fifth resistor module. By controlling the seventh switch or the first switch S1 to be closed, the potential difference between the positive electrode or the negative electrode of the battery to be charged 101 and the ground terminal GND can be lowered respectively.

[0193] Alternatively, the pressure relief module 103 may include an eighth switch and a sixth resistor module, and the eighth switch and the first switch S1 are controlled to be closed simultaneously, so that the sixth resistor module is connected in parallel with the first pressure relief unit 1031 .

[0194] In some embodiments, the first pressure relief unit 1031 is connected between the positive electrode of the battery to be charged 101 and the ground terminal GND, the second pressure relief unit 1032 is connected between the negative electrode of the battery to be charged 101 and the ground terminal GND, and the pressure relief module 103 may also include a seventh switch and a fifth resistor module and an eighth switch and a sixth resistor module.

[0195] In some embodiments, the fifth resistor module may include only one resistor, or may include multiple resistors connected in parallel, or may include multiple resistors connected in series. The equivalent resistance of the fifth resistor module is smaller than the equivalent resistance of the first resistor module 1031a, and smaller than the equivalent resistance of the second resistor module 1031b, which can play a good effect of lowering the voltage of the positive electrode of the battery to be charged 101 to the ground.

[0196] In some embodiments, the sixth resistor module may include only one resistor, or may include multiple resistors connected in parallel, or may include multiple resistors connected in series. The equivalent resistance of the sixth resistor module is smaller than the equivalent resistance of the first resistor module 1031a, and smaller than the equivalent resistance of the second resistor module 1031b, which can play a good effect of lowering the voltage of the negative electrode of the battery to be charged 101 to the ground.

[0197] In some embodiments, the seventh switch and the eighth switch can be any switch element including but not limited to a relay, a MOS tube, etc. that can control the on and off of a circuit.

[0198] It is worth noting that the closing and opening of the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch, and the eighth switch in the embodiment of the present application can all be executed by the controller.

[0199] In some embodiments, the controller is in communication with a BMS (Battery Management System), and the controller executes the operation of closing or opening the above switch in response to an instruction issued by the BMS. The instruction issued by the BMS may be a pre-set program.

[0200] In some embodiments, the controller may include but is not limited to an MCU (Microcontroller Unit).

[0201] In the above technical solution, the fifth resistor module and the sixth resistor module can play a role of voltage division, further lowering the voltage of the power supply end, and further improving the success rate of starting charging of the battery 101 to be charged.

[0202] According to some embodiments of the present application, the pressure relief module 103 is further configured to detect the insulation resistance of the positive electrode of the battery to be charged 101 to the ground, and detect the insulation resistance of the negative electrode of the battery to be charged 101 to the ground.

[0203] The battery charging process can be divided into a charging handshake stage, a charging parameter configuration stage, and a charging stage. In the charging handshake stage, an insulation test is performed on the battery to be charged 101. The reason for performing the insulation test is that the positive and negative poles of the battery are connected to the ground terminal GND through the shell of the electrical device (such as the body shell). If the insulation resistance of the positive pole of the battery to be charged 101 to the ground or the insulation resistance of the negative pole of the battery to be charged 101 to the ground is too small, a loop will be formed between the battery and the ground terminal GND, thereby endangering personal safety.

[0204] The insulation resistance of the positive electrode of the battery to be charged 101 to the ground and the insulation resistance of the negative electrode of the battery to be charged 101 to the ground can be detected by the first pressure relief unit 1031 and the second pressure relief unit 1032. The insulation resistance of the positive electrode of the battery to be charged 101 to the ground is the resistance of the equivalent positive electrode insulation resistance Rp, and the insulation resistance of the negative electrode of the battery to be charged 101 to the ground is the resistance of the equivalent negative electrode insulation resistance Rn.

[0205] As an example, a method for obtaining the equivalent positive electrode insulation resistance Rp and the equivalent negative electrode insulation resistance Rn through the first pressure relief unit 1031 and the second pressure relief unit 1032 may include: first, closing the first switch S1, opening the second switch S2, detecting the voltage U1 across the first pressure relief unit 1031 and the voltage U2 across the second pressure relief unit 1032, and the equivalent resistance of the first pressure relief unit 1031 is X1. The following formula (1) is obtained:

[0206] [(X1×Rp) / (X1+Rp)] / Rn=U1 / U2 (1)

[0207] Next, the second switch S2 is closed, the first switch S1 is opened, and the voltage U1' across the first pressure relief unit 1031 and the voltage U2' across the second pressure relief unit 1032 are detected. The equivalent resistance of the second pressure relief unit 1032 is X2. The following formula (2) is obtained:

[0208] [(X2×Rn) / (X2+Rn)] / Rp=U2' / U1' (2)

[0209] The equivalent resistance of the first pressure relief unit 1031 and the equivalent resistance of the second pressure relief unit 1032 can be measured by any method including but not limited to voltammetry, substitution method, half-bias method and direct measurement with an ohmmeter. Therefore, the values ​​of X1 and X2 are known values.

[0210] The voltage across the first pressure relief unit 1031 and the second pressure relief unit 1032 can be measured by a voltmeter, so U1, U2, U1', and U2' are known values. Therefore, the resistance values ​​of the equivalent positive electrode insulation resistance Rp and the equivalent negative electrode insulation resistance Rn can be calculated by the above formula (1) and formula (2).

[0211] It is understandable that the step of performing insulation detection on the battery to be charged 101 is performed separately from the step of detecting the voltage of the power supply end. Exemplarily, after the battery to be charged 101 is connected to the power supply end, the voltage of the power supply end is detected, and if the voltage of the power supply end is less than a preset voltage threshold, the insulation detection of the battery to be charged 101 is performed. Therefore, the pressure relief module 103 can be used to perform insulation detection and detection of the voltage of the power supply end respectively.

[0212] In the above technical solution, by setting the pressure relief module 103, it is not only used to lower the voltage of the power supply end in the step of detecting the voltage of the power supply end, thereby improving the success rate of starting the charging of the battery to be charged 101, but also can be used for insulation detection of the battery to be charged 101 after the battery to be charged 101 successfully starts charging, thereby ensuring the safe operation of the battery to be charged 101. In this way, there is no need to additionally set a module for insulation detection in the circuit, thereby greatly simplifying the circuit structure.

[0213] The present application embodiment provides a battery charging control method. Fig.23 ,include:

[0214] Step 110, connecting the positive electrode and the negative electrode of the battery to be charged to the power supply end of the power supply module;

[0215] Step 120, discharging the voltage of the positive electrode / negative electrode of the battery to be charged to the ground;

[0216] Step 130, detecting the voltage of the power supply end;

[0217] Step 140: Based on the detected voltage of the power supply end being less than a preset voltage threshold, control the power supply end to charge the battery to be charged.

[0218] By discharging the ground voltage of the positive / negative electrode of the rechargeable battery, the voltage of the power supply end can be greatly reduced. The relevant principle can be referred to the relevant description in the above embodiment, which will not be repeated below.

[0219] In step 130, the BMS may obtain the voltage of the charging port through the voltage detection circuit of the charging port. In some embodiments, the voltage detection circuit includes a sampling resistor, the sampling resistor is connected between the positive and negative electrodes of the charging port, and the voltage across the power supply end is obtained by sampling the voltage across the sampling resistor.

[0220] In step 140, the preset voltage threshold is related to the configuration of the power supply module and may be 10V or 60V.

[0221] When it is detected that the voltage at the power supply end is less than the preset voltage threshold, the power supply end can also be subjected to insulation detection to obtain the insulation resistance of the positive pole of the power supply end to the ground and the insulation resistance of the negative pole to the ground to avoid safety accidents such as leakage during charging.

[0222] After performing insulation testing on the power supply end, insulation testing can also be performed on the battery to be charged to obtain the insulation resistance of the positive electrode and the insulation resistance of the negative electrode of the battery to be charged to the ground. Afterwards, the power supply end is controlled to charge the battery to be charged.

[0223] In the above technical solution, by discharging the ground voltage of the positive / negative electrode of the battery to be charged 101, the potential difference between the positive / negative electrode of the battery and the ground terminal GND can be greatly reduced, so that the potential difference between the two ends of the branch where the power supply end is located is reduced accordingly, thereby reducing the voltage of the power supply end, so that the voltage of the power supply end can be lower than the preset voltage threshold, thereby improving the success rate of starting charging of the battery to be charged 101.

[0224] Combined with reference Fig.24 as well as Figure 7 According to some embodiments of the present application, discharging the voltage of the positive electrode / negative electrode of the rechargeable battery 101 to the ground includes:

[0225] Step 210, constructing a discharge circuit, the discharge circuit including a pressure relief module 103;

[0226] In step 220, the pressure relief module 103 connects the positive electrode of the battery to be charged 101 to the ground terminal GND, and / or connects the negative electrode of the battery to be charged 101 to the ground terminal GND, so as to discharge the voltage of the positive electrode of the battery to be charged 101 to the ground or the voltage of the negative electrode of the battery to be charged 101 to the ground.

[0227] For the description of the pressure relief module 103 of the discharge circuit, reference may be made to the relevant description in the above embodiment, which will not be repeated below.

[0228] By constructing a discharge circuit to discharge the voltage of the positive electrode / negative electrode of the rechargeable battery 101 to the ground, the voltage discharge step is simplified.

[0229] According to some embodiments of the present application, the pressure relief module 103 is connected to the positive electrode of the battery to be charged 101 and the ground terminal GND, and discharges the voltage of the positive electrode of the battery to be charged 101 connected thereto to the ground, including:

[0230] The pressure relief module 103 controls the equivalent resistance formed between the positive electrode of the battery to be charged 101 and the ground terminal GND to be smaller than the insulation resistance of the positive electrode of the battery to be charged 101 to the ground.

[0231] Controlling the pressure relief module 103 to connect the negative electrode of the battery to be charged 101 and the ground terminal GND, and to discharge the voltage of the negative electrode of the battery to be charged 101 connected thereto to the ground includes:

[0232] The pressure relief module 103 controls the equivalent resistance formed between the negative electrode of the battery to be charged 101 and the ground terminal GND to be smaller than the insulation resistance of the negative electrode of the battery to be charged 101 to the ground.

[0233] The equivalent resistance formed by the pressure relief module 103 between the positive electrode of the battery to be charged 101 and the ground terminal GND refers to the resistance presented by the portion of the pressure relief module 103 connected between the positive electrode of the battery to be charged 101 and the ground terminal GND.

[0234] The equivalent resistance formed by the pressure relief module 103 between the negative electrode of the battery to be charged 101 and the ground terminal GND refers to the resistance presented by the portion of the pressure relief module 103 connected between the negative electrode of the battery to be charged 101 and the ground terminal GND.

[0235] In the above technical solution, during the period when the pressure relief module 103 is connected to the positive / negative electrode of the battery to be charged 101 and the ground terminal GND, the pressure relief module 103 is connected in parallel with the insulation resistance of the positive / negative electrode of the battery to be charged 101 to the ground, and the resistance value after the parallel connection is greatly reduced, thereby lowering the potential between the positive / negative electrode of the battery to be charged 101 and the ground terminal GND, reducing the voltage at the power supply end, and improving the success rate of starting charging of the battery to be charged 101.

[0236] Combined with reference Fig.25 , 26 , Fig.14 as well as Fig.15 According to some embodiments of the present application, the pressure relief module 103 includes: a first pressure relief unit 1031 and a second pressure relief unit 1032, the first pressure relief unit 1031 is connected to the positive electrode of the battery to be charged 101 and the ground terminal GND, the second pressure relief unit 1032 is connected to the negative electrode of the battery to be charged 101 and the ground terminal GND, the first pressure relief unit 1031 includes a first switch S1, and the second pressure relief unit 1032 includes a second switch S2.

[0237] like Fig.14 As shown, discharging the voltage of the positive electrode of the rechargeable battery 101 to the ground includes:

[0238] Step 310, closing the first switch S1, so that the first pressure relief unit 1031 connects the positive electrode of the battery to be charged 101 and the ground terminal GND;

[0239] In step 320 , the first pressure relief unit 1031 discharges the voltage of the positive electrode to the ground.

[0240] like Fig.15 As shown, discharging the voltage of the negative electrode of the battery to be charged 101 to the ground includes:

[0241] Step 410, closing the second switch S2, so that the second pressure relief unit 1032 connects the negative electrode of the battery to be charged 101 and the ground terminal GND;

[0242] In step 420 , the second pressure relief unit 1032 discharges the voltage of the negative electrode to the ground.

[0243] The structures and pressure relief principles of the first pressure relief unit 1031 and the second pressure relief unit 1032 may refer to the relevant descriptions in the above embodiments, which will not be described in detail below.

[0244] In step 310 , while the first switch S1 is closed, the second switch S2 is opened, so that the potential difference between the positive electrode of the battery to be charged 101 and the ground terminal GND can be greatly reduced.

[0245] In step 410 , while the second switch S2 is closed, the first switch S1 is opened, so that the potential difference between the negative electrode of the battery to be charged 101 and the ground GND can be greatly reduced.

[0246] In the above technical solution, no matter whether the positive electrode or the negative electrode of the battery to be charged 101 forms a potential loop through the ground terminal GND and the power supply terminal, the voltage of the power supply terminal can be lowered by turning on the first pressure relief unit 1031 through the first switch S1 or turning on the second pressure relief unit 1032 through the second switch S2, thereby further improving the success rate of starting charging of the battery to be charged 101.

[0247] According to some embodiments of the present application, the first pressure relief unit and the second pressure relief unit both include: a first resistor module, the first resistor module of the first pressure relief unit is connected in series with the first switch, and the first resistor module of the second pressure relief unit is connected in series with the second switch.

[0248] Discharging the voltage of the positive electrode of the battery to be charged to ground includes:

[0249] The first switch is closed to connect the first resistor module between the positive electrode of the battery to be charged and the ground.

[0250] Discharging the voltage of the negative electrode of the battery to be charged to ground includes:

[0251] The second switch is closed to connect the first resistor module between the negative electrode of the battery to be charged and the ground.

[0252] Regarding the principle of discharging the ground voltage of the positive electrode / negative electrode of the rechargeable battery through the first resistor module and the structure of the first resistor module, reference may be made to the relevant description of the above embodiment, which will not be repeated below.

[0253] In some embodiments, while the first switch is closed, the second switch is opened, so that only the first resistance module of the first pressure relief unit is connected between the positive electrode of the battery to be charged and the ground.

[0254] While the second switch is closed, the first switch is opened, so that only the first resistance module of the second pressure relief unit is connected between the negative electrode of the battery to be charged and the ground.

[0255] In the above technical solution, the first switch / the second switch can be closed so that the first resistor module is connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged to the ground terminal, thereby playing a voltage dividing role, lowering the potential difference between the positive electrode / negative electrode of the battery to be charged and the ground terminal, reducing the voltage at the power supply end, and improving the success rate of starting charging of the battery to be charged.

[0256] Combined with reference Fig.16 as well as Fig.17 According to some embodiments of the present application, the first pressure relief unit 1031 and the second pressure relief unit 1032 also include: a second resistance module 1031b, the second resistance module 1031b of the first pressure relief unit 1031 is connected in parallel with the first resistance module 1031a of the first pressure relief unit 1031, and the second resistance module 1031b of the second pressure relief unit 1032 is connected in parallel with the first resistance module 1031a of the second pressure relief unit 1032.

[0257] Discharging the voltage of the positive electrode of the rechargeable battery 101 to the ground further includes:

[0258] The first switch S1 is closed to connect the first resistance module 1031a and the second resistance module 1031b connected in parallel between the positive electrode of the battery to be charged 101 and the ground terminal GND.

[0259] Discharging the voltage of the negative electrode of the rechargeable battery 101 to the ground further includes:

[0260] The second switch S2 is closed to connect the first resistance module 1031a and the second resistance module 1031b connected in parallel between the negative electrode of the battery to be charged 101 and the ground terminal GND.

[0261] For the connection mode and structure of the first resistance module 1031a and the second resistance module 1031b in the first pressure relief unit 1031 and the second pressure relief unit 1032 and the principle of discharging the ground voltage of the positive electrode / negative electrode of the rechargeable battery 101, reference may be made to the relevant description in the above embodiments.

[0262] In some embodiments, while the first switch S1 is closed, the second switch S2 is opened so that only the first resistance module 1031a and the second resistance module 1031b of the first pressure relief unit 1031 are connected between the positive electrode of the battery 101 to be charged and the ground GND.

[0263] While the second switch S2 is closed, the first switch S1 is opened, so that only the first resistance module 1031a and the second resistance module 1031b of the second pressure relief unit 1032 are connected between the negative electrode of the battery 101 to be charged and the ground GND.

[0264] In the above technical solution, the branch after the first resistor module 1031a and the second resistor module 1031b are connected in parallel is then connected in parallel with the branch from the positive electrode / negative electrode of the battery to be charged 101 to the ground terminal GND. Since the resistance of the branch after the first resistor module 1031a and the second resistor module 1031b are connected in parallel is smaller than the resistance of the branch where only the first resistor module 1031a is located, the potential difference between the positive electrode / negative electrode of the battery to be charged 101 and the ground terminal GND can be further lowered, thereby further reducing the voltage of the power supply end, greatly improving the success rate of starting charging of the battery to be charged 101.

[0265] Combined with reference Figure 27 to Figure 28 According to some embodiments of the present application, discharging the ground voltage of the positive electrode of the rechargeable battery 101 further includes:

[0266] Step 510, close the first switch S1 and the second switch S2, so that the first pressure relief unit 1031 connects the positive electrode of the battery to be charged 101 and the ground terminal GND, and the second pressure relief unit 1032 connects the negative electrode of the battery to be charged 101 and the ground terminal GND;

[0267] Step 520 , controlling the equivalent resistance of the first pressure relief unit 1031 to be smaller than the equivalent resistance of the second pressure relief unit 1032 , so as to discharge the voltage of the positive electrode of the rechargeable battery 101 to the ground.

[0268] Discharging the voltage of the negative electrode of the rechargeable battery 101 to the ground further includes:

[0269] Step 610, close the first switch S1 and the second switch S2, so that the first pressure relief unit 1031 connects the positive electrode of the battery to be charged 101 and the ground terminal GND, and the second pressure relief unit 1032 connects the negative electrode of the battery to be charged 101 and the ground terminal GND;

[0270] Step 620 , controlling the equivalent resistance of the second pressure relief unit 1032 to be smaller than the equivalent resistance of the first pressure relief unit 1031 , so as to discharge the voltage of the negative electrode of the battery 101 to be charged to the ground.

[0271] That is, the first pressure relief unit 1031 and the second pressure relief unit 1032 are turned on at the same time.

[0272] In step 520, the divided voltage at both ends of the battery to be charged 101 at both ends of the first pressure relief unit 1031 is made smaller than the divided voltage at both ends of the second pressure relief unit 1032. When a potential loop is formed between the power supply end and the positive electrode of the battery to be charged 101, the voltage of the positive electrode of the battery to be charged 101 to the ground can be lowered.

[0273] In step 620, the divided voltage at both ends of the battery to be charged 101 at both ends of the first pressure relief unit 1031 is greater than the divided voltage at both ends of the second pressure relief unit 1032. When a potential loop is formed between the power supply end and the negative electrode of the battery to be charged 101, the voltage of the negative electrode of the battery to be charged 101 to the ground can be lowered.

[0274] In some embodiments, the structure of the first pressure relief unit 1031 and the structure of the second pressure relief unit 1032 can be the same, and the first pressure relief unit 1031 and the second pressure relief unit 1032 both include at least two resistors in parallel, which respectively control the conduction conditions of the parallel resistors in the first pressure relief unit 1031 and the second pressure relief unit 1032 to be different, thereby controlling the equivalent resistance value of the first pressure relief unit 1031 to be different from the equivalent resistance value of the second pressure relief unit 1032.

[0275] Exemplarily, the number of parallel branches in the first pressure relief unit 1031 that are turned on is controlled to be greater than the number of parallel branches in the second pressure relief unit 1032, and the equivalent resistance of the first pressure relief unit 1031 is controlled to be smaller than the equivalent resistance of the second pressure relief unit 1032; conversely, the equivalent resistance of the second pressure relief unit 1032 is controlled to be smaller than the equivalent resistance of the first pressure relief unit 1031.

[0276] In the above technical solution, the first pressure relief unit 1031 or the second pressure relief unit 1032 with a smaller equivalent resistance has a smaller divided voltage, which can lower the ground voltage of the positive / negative electrode of the battery 101 to be charged connected to the first pressure relief unit 1031 or the second pressure relief unit 1032 with a smaller equivalent resistance, so that no matter whether the first pressure relief unit 1031 or the second pressure relief unit 1032 is turned on individually or together, it can play the effect of lowering the voltage of the power supply end, thereby simplifying the control of the circuit.

[0277] Combined with reference Figures 19 to 22 ,as well as Figure 29 to Figure 30According to some embodiments of the present application, the first pressure relief unit 1031 and the second pressure relief unit 1032 both include: a first resistance module 1031a and a second resistance module 1031b. In the first pressure relief unit 1031, the first resistance module 1031a is connected in series with the first switch S1, and the second resistance module 1031b is connected in parallel with the first resistance module 1031a. In the second pressure relief unit 1032, the first resistance module 1031a is connected in series with the second switch S2, and the second resistance module 1031b is connected in parallel with the first resistance module 1031a. The first pressure relief unit 1031 also includes: a third switch S3, which is connected in series with the second resistance module 1031b of the first pressure relief unit 1031 and in parallel with the first resistance module 1031a of the first pressure relief unit 1031. The second pressure relief unit 1032 also includes: a fourth switch S4, which is connected in series with the second resistance module 1031b of the second pressure relief unit 1032 and in parallel with the first resistance module 1031a of the second pressure relief unit 1032.

[0278] Discharging the ground voltage of the positive electrode of the rechargeable battery 101 includes:

[0279] Step 710, closing the first switch S1 and the second switch S2;

[0280] Step 720: close the third switch S3.

[0281] Discharging the voltage of the negative electrode of the battery to be charged 101 to the ground includes:

[0282] Step 810, closing the first switch S1 and the second switch S2;

[0283] Step 820, close the fourth switch S4.

[0284] For the description of the connection mode and structure of the third switch S3 and the fourth switch S4 in the first pressure relief unit 1031 and the second pressure relief unit 1032 respectively, reference may be made to the relevant description in the above embodiments, which will not be repeated below.

[0285] The principle of discharging the voltage of the positive electrode of the rechargeable battery 101 to the ground through steps 710 and 720 and discharging the voltage of the negative electrode of the rechargeable battery 101 to the ground through steps 810 and 820 can be referred to the relevant description of the above embodiments, which will not be repeated below.

[0286] In step 720, while the third switch S3 is closed, the fourth switch S4 is opened.

[0287] In step 820 , while the fourth switch S4 is closed, the third switch S3 is opened.

[0288] Since the first pressure relief unit 1031 and the second pressure relief unit 1032 have the same structure, the equivalent resistance of the first pressure relief unit 1031 and the second pressure relief unit 1032 can be converted by alternately conducting the third switch S3 and the fourth switch S4, so that the voltage of the positive electrode of the rechargeable battery 101 to the ground and the voltage of the negative electrode of the rechargeable battery 101 to the ground can be discharged respectively.

[0289] According to some embodiments of the present application, the discharge circuit further includes: a fifth switch S5 and a third resistor module 1033 connected in series between the positive electrode of the battery to be charged 101 and the negative electrode of the power supply end; and a sixth switch S6 and a fourth resistor module 1034 connected in series between the negative electrode of the battery to be charged 101 and the positive electrode of the power supply end.

[0290] Discharging the voltage of the positive electrode of the rechargeable battery 101 to the ground further includes:

[0291] The sixth switch S6 is closed, so that two ends of the fourth resistor module 1034 are electrically connected to the negative electrode of the battery to be charged 101 and the positive electrode of the power supply terminal respectively.

[0292] Discharging the voltage of the negative electrode of the rechargeable battery 101 to the ground further includes:

[0293] The fifth switch S5 is closed, so that two ends of the third resistor module 1033 are electrically connected to the positive electrode of the battery to be charged 101 and the negative electrode of the power supply end respectively.

[0294] When the equivalent impedance R1 is connected to the positive electrode of the battery to be charged 101, the fourth switch S4 is disconnected while the first switch S1, the second switch S2, and the third switch S3 are closed, and the equivalent resistance of the first pressure relief unit 1031 is smaller than the equivalent resistance of the second pressure relief unit 1032, so that the voltage of the positive electrode of the battery to be charged 101 to the ground is smaller than 0.5 times the total voltage across the battery to be charged 101, and then the sixth switch S6 is closed to form a bridge structure.

[0295] When the equivalent impedance R1 is connected to the negative electrode of the battery to be charged 101, the third switch S3 is disconnected while the first switch S1, the second switch S2, and the fourth switch S4 are closed, and the equivalent resistance of the second pressure relief unit 1032 is smaller than the equivalent resistance of the first pressure relief unit 1031, so that the voltage of the negative electrode of the battery to be charged 101 to the ground is smaller than 0.5 times the total voltage across the battery to be charged 101, and then the fifth switch S5 is closed to form a bridge structure.

[0296] Through the bridge architecture, the potential difference between the power supply end and the ground end GND can be balanced, so that the voltage of the power supply end approaches 0V.

[0297] The principle of forming a bridge structure by closing the first switch S1, the second switch S2, the third switch S3, and the sixth switch S6 and opening the fourth switch S4 and balancing the potential difference between the power supply terminal and the ground terminal GND can refer to the relevant description of the above embodiment. And the principle of forming a bridge structure by closing the first switch S1, the second switch S2, the fourth switch S4, and the fifth switch S5 and opening the third switch S3 and balancing the potential difference between the power supply terminal and the ground terminal GND can refer to the relevant description of the above embodiment, which will not be repeated below.

[0298] The structures of the first resistance module 1031 a , the second resistance module 1031 b , the third resistance module 1033 and the fourth resistance module 1034 may refer to the related description of the above embodiments, which will not be described in detail below.

[0299] It can be understood that when the equivalent impedance R1 is connected to the positive electrode of the battery to be charged 101, the sixth switch S6 is closed and the fifth switch S5 is opened. When the equivalent impedance R1 is connected to the negative electrode of the battery to be charged 101, the fifth switch S5 is closed and the sixth switch S6 is opened. In this way, the fifth switch S5 or the sixth switch S6 can be selectively closed according to the different positions where the equivalent impedance R1 is formed, thereby improving efficiency.

[0300] In the above technical solution, by respectively turning on the third resistor module 1033 and the fourth resistor module 1034, when the pressure relief module 103 discharges the voltage of the negative electrode and the positive electrode of the battery to be charged 101 to the ground respectively, a bridge structure is formed between the charging end and the battery to be charged 101 together with the ground terminal GND, so that the potential difference between the power supply end and the ground terminal GND tends to be balanced, and the voltage of the power supply end tends to 0V, which greatly improves the success rate of starting charging of the battery to be charged 101.

[0301] According to some embodiments of the present application, the pressure relief module further includes: a seventh switch and a fifth resistor module connected in series between the positive electrode of the battery to be charged and the ground terminal, and / or an eighth switch and a sixth resistor module connected in series between the negative electrode of the battery to be charged and the ground terminal.

[0302] Discharging the ground voltage of the positive electrode of the battery to be charged further includes: closing the seventh switch.

[0303] And / or, discharging the voltage of the negative electrode of the battery to be charged to the ground further includes:

[0304] Close the eighth switch.

[0305] For the structures of the seventh switch and the fifth resistor module, and the eighth switch and the sixth resistor module, and the connection method in the circuit, reference may be made to the relevant description of the above embodiments, which will not be repeated below.

[0306] In some embodiments, the first pressure relief unit 1031 is connected between the positive electrode of the battery to be charged 101 and the ground terminal GND, and the pressure relief module 103 includes: a seventh switch and a fifth resistor module, and the seventh switch and the first switch S1 are controlled to be closed at the same time, so that the fifth resistor module is connected in parallel with the first pressure relief unit 1031, and the potential difference between the positive electrode of the battery to be charged 101 and the ground terminal GND is further lowered. Alternatively, the pressure relief module 103 includes an eighth switch and a sixth resistor module, and the eighth switch or the first switch S1 is controlled to be closed, which can respectively lower the potential difference between the negative electrode or the positive electrode of the battery to be charged 101 and the ground terminal GND.

[0307] In other embodiments, the first pressure relief unit 1031 is connected between the negative electrode of the battery to be charged 101 and the ground terminal GND, and the pressure relief module 103 includes: a seventh switch and a fifth resistor module, and the seventh switch or the first switch S1 is controlled to be closed, which can respectively lower the potential difference between the positive electrode or the negative electrode of the battery to be charged 101 and the ground terminal GND. Alternatively, the pressure relief module 103 includes an eighth switch and a sixth resistor module, and the eighth switch and the first switch S1 are controlled to be closed at the same time, so that the sixth resistor module is connected in parallel with the first pressure relief unit 1031, and the potential difference between the negative electrode of the battery to be charged 101 and the ground terminal GND is further lowered.

[0308] In some embodiments, the first pressure relief unit 1031 is connected between the positive electrode of the battery to be charged 101 and the ground terminal GND, the second pressure relief unit 1032 is connected between the negative electrode of the battery to be charged 101 and the ground terminal GND, and the pressure relief module 103 includes a seventh switch and a fifth resistor module and an eighth switch and a sixth resistor module. During the closing of the seventh switch, the first switch S1 can be closed and the second switch S2 can be opened, so that the fifth resistor module is connected in parallel with the first pressure relief unit 1031, further lowering the potential difference between the positive electrode of the battery to be charged 101 and the ground terminal GND; and, during the closing of the eighth switch, the second switch S2 can be closed and the first switch S1 can be opened, so that the sixth resistor module is connected in parallel with the second pressure relief unit 1032, further lowering the potential difference between the negative electrode of the battery to be charged 101 and the ground terminal GND.

[0309] It is worth noting that when one of the seventh switch and the eighth switch is closed, the other is opened, so that the voltage divided between the positive electrode of the battery to be charged 101 and the ground terminal GND or between the negative electrode of the battery to be charged 101 and the ground terminal GND is smaller, thereby achieving a pressure relief effect.

[0310] In the above technical solution, the fifth resistor module and the sixth resistor module can play a role of voltage division, further lowering the voltage of the power supply end, and further improving the success rate of starting charging of the battery 101 to be charged.

[0311] The present application embodiment provides a discharge circuit for battery charging, referring to Figure 7 , including: a pressure relief module 103, configured to connect the positive electrode of the battery to be charged 101 and the ground terminal GND, and / or connect the negative electrode of the battery to be charged 101 and the ground terminal GND, so as to discharge the voltage of the positive electrode of the battery to be charged 101 to the ground or the voltage of the negative electrode of the battery to be charged 101 to the ground connected thereto, wherein the positive electrode and the negative electrode of the battery to be charged 101 are connected to the power supply end of the power supply module 102.

[0312] refer to Fig.14 as well as Fig.15 The pressure relief module 103 includes: a first pressure relief unit 1031 and a second pressure relief unit 1032, the first pressure relief unit 1031 is connected to the positive electrode of the battery to be charged 101 and the ground terminal GND, the second pressure relief unit 1032 is connected to the negative electrode of the battery to be charged 101 and the ground terminal GND, the first pressure relief unit 1031 includes a first switch S1, and the second pressure relief unit 1032 includes a second switch S2.

[0313] refer to Fig.16 as well as Fig.17 The first pressure relief unit 1031 and the second pressure relief unit 1032 each include: a first resistance module 1031a and a second resistance module 1031b. The first resistance module 1031a of the first pressure relief unit 1031 is connected in series with the first switch S1, and the second resistance module 1031b is connected in parallel with the first resistance module 1031a of the first pressure relief unit 1031. The first resistance module 1031a of the second pressure relief unit 1032 is connected in series with the second switch S2, and the second resistance module 1031b is connected in parallel with the first resistance module 1031a of the second pressure relief unit 1032.

[0314] The first pressure relief unit 1031 also includes: a third switch S3, which is connected in series with the second resistance module 1031b of the first pressure relief unit 1031 and in parallel with the first resistance module 1031a of the first pressure relief unit 1031. The second pressure relief unit 1032 also includes: a fourth switch S4, which is connected in series with the second resistance module 1031b of the second pressure relief unit 1032 and in parallel with the first resistance module 1031a of the second pressure relief unit 1032.

[0315] Exemplarily, discharging the ground voltage of the positive electrode of the battery to be charged 101 may include: closing the first switch S1 and the third switch S3 , and opening the second switch S2 and the fourth switch S4 .

[0316] Discharging the ground voltage of the negative electrode of the battery to be charged 101 may include: closing the second switch S2 and the fourth switch S4 , and opening the first switch S1 and the third switch S3 .

[0317] refer to Fig.19 as well as Fig. 20 The discharge circuit also includes: a fifth switch S5 and a third resistor module 1033 connected in series between the positive electrode of the battery to be charged 101 and the negative electrode of the power supply end; a sixth switch S6 and a fourth resistor module 1034 connected in series between the negative electrode of the battery to be charged 101 and the positive electrode of the power supply end.

[0318] Exemplarily, discharging the ground voltage of the positive electrode of the battery to be charged 101 may also include: closing the first switch S1 , the second switch S2 , the third switch S3 , and the sixth switch S6 , and opening the fourth switch S4 .

[0319] Discharging the ground voltage of the positive electrode of the battery to be charged 101 may also include: closing the first switch S1 , the second switch S2 , the fourth switch S4 , and the fifth switch S5 , and opening the third switch S3 .

[0320] The first pressure relief unit 1031 and the second pressure relief unit 1032 may also be used to perform insulation detection on the battery, so as to detect the insulation resistance of the positive electrode of the battery to be charged 101 to the ground and the insulation resistance of the negative electrode of the battery to be charged 101 to the ground.

[0321] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A discharge circuit for battery charging, characterized in that: include: A pressure relief module is configured to connect the positive electrode of the battery to be charged and the ground terminal, and / or to connect the negative electrode of the battery to be charged and the ground terminal, so as to discharge the voltage of the positive electrode of the battery to be charged to the ground or the voltage of the negative electrode of the battery to be charged to the ground connected thereto; the pressure relief module includes: a first pressure relief unit, wherein a first end of the first pressure relief unit is connected to the positive electrode / negative electrode of the battery to be charged, and a second end of the first pressure relief unit is connected to the ground end, The first pressure relief unit includes a first switch, the first switch is configured to be closed so that the first pressure relief unit connects the ground end with the positive electrode / negative electrode of the battery to be charged, and the first pressure relief unit is configured to discharge the voltage of the positive electrode / negative electrode connected thereto to the ground; the pressure relief module also includes: a seventh switch and a fifth resistor module connected in series between the positive electrode of the battery to be charged and the ground terminal, and / or an eighth switch and a sixth resistor module connected in series between the negative electrode of the battery to be charged and the ground terminal, The seventh switch is configured to be closed to enable the pressure relief module to discharge the voltage of the positive electrode of the battery to be charged to the ground. The eighth switch is configured to be closed to enable the pressure relief module to discharge the voltage of the negative electrode of the battery to be charged to the ground; Wherein, the positive electrode and the negative electrode of the battery to be charged are connected to the power supply end of the power supply module.

2. The discharge circuit for battery charging according to claim 1, characterized in that: The first pressure relief unit comprises: A first resistor module, wherein the first resistor module is connected in series with the first switch, and the first switch is configured to be closed so that two ends of the first resistor module are electrically connected to the ground terminal and the positive electrode / negative electrode of the battery to be charged, respectively.

3. The discharge circuit for battery charging according to claim 2, characterized in that: The first pressure relief unit further comprises: The second resistor module is connected in parallel with the first resistor module, and the first switch is configured to be closed so that the first resistor module and the second resistor module are connected in parallel between the ground terminal and the positive electrode / negative electrode of the battery to be charged.

4. The discharge circuit for battery charging according to claim 3, characterized in that: The equivalent resistance of the second resistance module is smaller than the equivalent resistance of the first resistance module.

5. The discharge circuit for battery charging according to any one of claims 1 to 4, characterized in that: The pressure relief module comprises: a second pressure relief unit, the second pressure relief unit comprising a second switch, wherein a first end of the second pressure relief unit is connected to the negative electrode of the battery to be charged, a second end of the second pressure relief unit is connected to the ground end, and the second switch is configured to be closed so that the second pressure relief unit connects the ground end and the negative electrode of the battery to be charged, so as to discharge the voltage of the negative electrode to the ground; The first end of the first pressure relief unit is connected to the positive electrode of the battery to be charged, and the second end is connected to the ground.

6. The discharge circuit for battery charging according to claim 5, characterized in that: The structure of the second pressure relief unit is the same as that of the first pressure relief unit.

7. The discharge circuit for battery charging according to claim 5, characterized in that: The first switch and the second switch are configured to be able to be closed in the same time period, and an equivalent resistance value formed by the first pressure relief unit between the positive electrode of the battery to be charged and the ground terminal is different from an equivalent resistance value formed by the second pressure relief unit between the negative electrode of the battery to be charged and the ground terminal.

8. The discharge circuit for battery charging according to claim 7, characterized in that: The structure of the second pressure relief unit is the same as that of the first pressure relief unit. In the case where the first pressure relief unit includes a first resistance module and a second resistance module, The first pressure relief unit further includes: a third switch, the third switch is connected in series with the second resistance module of the first pressure relief unit, and is connected in parallel with the first resistance module of the first pressure relief unit. The second pressure relief unit further includes: a fourth switch, the fourth switch is connected in series with the second resistance module of the second pressure relief unit, and is connected in parallel with the first resistance module of the second pressure relief unit, The third switch and the fourth switch are configured such that when one of the switches is closed, the other is open.

9. The discharge circuit for battery charging according to claim 8, characterized in that: The discharge circuit further includes: A fifth switch and a third resistor module connected in series between the positive electrode of the battery to be charged and the negative electrode of the power supply end, wherein the fifth switch is configured to be closed during the period when the first switch, the second switch and the fourth switch are closed, so that the two ends of the third resistor module are electrically connected to the positive electrode of the battery to be charged and the negative electrode of the power supply end respectively; A sixth switch and a fourth resistor module connected in series between the negative electrode of the battery to be charged and the positive electrode of the power supply end, wherein the sixth switch is configured to be closed during the period when the first switch, the second switch and the third switch are closed, so that the two ends of the fourth resistor module are electrically connected to the negative electrode of the battery to be charged and the positive electrode of the power supply end, respectively.

10. The discharge circuit for battery charging according to claim 5, characterized in that: The pressure relief module is further configured to detect the insulation resistance of the positive electrode of the battery to be charged to the ground, and to detect the insulation resistance of the negative electrode of the battery to be charged to the ground.

11. A battery charging control method, characterized in that: include: Connect the positive and negative electrodes of the battery to be charged to the power supply terminal of the power supply module; Discharge the voltage of the positive / negative pole of the battery to be charged to ground, including: Constructing a discharge circuit, wherein the discharge circuit includes a pressure relief module; The pressure relief module is connected to the positive electrode of the battery to be charged and the ground terminal, and / or connected to the negative electrode of the battery to be charged and the ground terminal, so as to discharge the voltage of the positive electrode of the battery to be charged to the ground or the voltage of the negative electrode of the battery to be charged to the ground connected thereto, wherein: The pressure relief module includes: a first pressure relief unit, a first end of the first pressure relief unit is connected to the positive electrode / negative electrode of the battery to be charged, a second end of the first pressure relief unit is connected to the ground end, the first pressure relief unit includes a first switch, and the discharge of the voltage of the positive electrode / negative electrode of the battery to be charged to the ground includes: Closing the first switch so that the first pressure relief unit connects the positive electrode / negative electrode of the battery to be charged to the ground terminal; The pressure relief module further includes: a seventh switch and a fifth resistor module connected in series between the positive electrode of the battery to be charged and the ground terminal, and / or an eighth switch and a sixth resistor module connected in series between the negative electrode of the battery to be charged and the ground terminal, The step of discharging the ground voltage of the positive electrode of the battery to be charged further comprises: closing the seventh switch; and / or, The step of discharging the voltage of the negative electrode of the battery to be charged to the ground further comprises: closing the eighth switch; The method further comprises: Detecting the voltage of the power supply end; Based on the detected voltage of the power supply end being less than a preset voltage threshold, the power supply end is controlled to charge the battery to be charged.

12. The method according to claim 11, characterized in that The pressure relief module is connected to the positive electrode of the battery to be charged and the ground terminal, and discharges the voltage of the positive electrode of the battery to be charged to the ground connected thereto, including: controlling the pressure relief module to form an equivalent resistance between the positive electrode of the battery to be charged and the ground terminal to be smaller than the insulation resistance of the positive electrode of the battery to be charged to the ground; The pressure relief module is connected to the negative electrode of the battery to be charged and the ground terminal, and discharges the voltage of the negative electrode of the battery to be charged to the ground connected thereto, including: controlling the pressure relief module to form an equivalent resistance between the negative electrode of the battery to be charged and the ground terminal to be smaller than the insulation resistance of the negative electrode of the battery to be charged to the ground.

13. The method according to claim 12, characterized in that The pressure relief module further includes: a second pressure relief unit, wherein the first pressure relief unit is connected to the positive electrode of the battery to be charged and the ground terminal, the second pressure relief unit is connected to the negative electrode of the battery to be charged and the ground terminal, and the second pressure relief unit includes a second switch, Discharging the voltage of the positive electrode of the battery to be charged to ground includes: Closing the first switch so that the first pressure relief unit connects the positive electrode of the battery to be charged and the ground terminal; The first pressure relief unit discharges the voltage of the positive electrode to the ground; Discharging the voltage of the negative electrode of the battery to be charged to ground includes: Closing the second switch so that the second pressure relief unit connects the negative electrode of the battery to be charged and the ground terminal; The second pressure relief unit discharges the voltage of the negative electrode to the ground.

14. The method according to claim 13, characterized in that The first pressure relief unit and the second pressure relief unit both include: a first resistor module, the first resistor module of the first pressure relief unit is connected in series with the first switch, and the first resistor module of the second pressure relief unit is connected in series with the second switch. The step of discharging the ground voltage of the positive electrode of the battery to be charged comprises: Closing the first switch to connect the first resistor module between the positive electrode of the battery to be charged and the ground terminal; The step of discharging the voltage of the negative electrode of the battery to be charged to the ground comprises: The second switch is closed to connect the first resistance module between the negative electrode of the battery to be charged and the ground terminal.

15. The method according to claim 14, characterized in that The first pressure relief unit and the second pressure relief unit both further include: a second resistance module, the second resistance module of the first pressure relief unit is connected in parallel with the first resistance module of the first pressure relief unit, and the second resistance module of the second pressure relief unit is connected in parallel with the first resistance module of the second pressure relief unit, The step of discharging the ground voltage of the positive electrode of the battery to be charged further comprises: Closing the first switch to connect the first resistance module and the second resistance module in parallel between the positive electrode of the battery to be charged and the ground terminal; The step of discharging the voltage of the negative electrode of the battery to be charged to the ground further comprises: The second switch is closed to connect the first resistance module and the second resistance module in parallel between the negative electrode of the battery to be charged and the ground terminal.

16. The method according to claim 13, characterized in that The step of discharging the ground voltage of the positive electrode of the battery to be charged further comprises: Closing the first switch and the second switch so that the first pressure relief unit connects the positive electrode of the battery to be charged with the ground terminal, and the second pressure relief unit connects the negative electrode of the battery to be charged with the ground terminal; Controlling the equivalent resistance of the first pressure relief unit to be smaller than the equivalent resistance of the second pressure relief unit, so as to discharge the voltage of the positive electrode of the battery to be charged to the ground; The step of discharging the voltage of the negative electrode of the battery to be charged to the ground further comprises: Closing the first switch and the second switch so that the first pressure relief unit connects the positive electrode of the battery to be charged with the ground terminal, and the second pressure relief unit connects the negative electrode of the battery to be charged with the ground terminal; The equivalent resistance of the second pressure relief unit is controlled to be smaller than the equivalent resistance of the first pressure relief unit, so as to discharge the voltage of the negative electrode of the battery to be charged to the ground.

17. The method according to claim 16, characterized in that The first pressure relief unit and the second pressure relief unit both include: a first resistor module and a second resistor module. In the first pressure relief unit, the first resistor module is connected in series with the first switch, and the second resistor module is connected in parallel with the first resistor module. In the second pressure relief unit, the first resistor module is connected in series with the second switch, and the second resistor module is connected in parallel with the first resistor module. The first pressure relief unit also includes: a third switch connected in series with the second resistor module of the first pressure relief unit and in parallel with the first resistor module of the first pressure relief unit. The second pressure relief unit also includes: a fourth switch connected in series with the second resistor module of the second pressure relief unit and in parallel with the first resistor module of the second pressure relief unit. The step of discharging the ground voltage of the positive electrode of the battery to be charged comprises: closing the first switch and the second switch; closing the third switch; The step of discharging the voltage of the negative electrode of the battery to be charged to the ground comprises: closing the first switch and the second switch; The fourth switch is closed.

18. The method according to claim 17, characterized in that The discharge circuit further includes: a fifth switch and a third resistor module connected in series between the positive electrode of the battery to be charged and the negative electrode of the power supply end; a fourth pressure relief unit, a sixth switch and a fourth resistor module connected in series between the negative electrode of the battery to be charged and the positive electrode of the power supply end; The step of discharging the ground voltage of the positive electrode of the battery to be charged further comprises: Closing the sixth switch so that the two ends of the fourth resistor module are electrically connected to the negative electrode of the battery to be charged and the positive electrode of the power supply end respectively; The step of discharging the voltage of the negative electrode of the battery to be charged to the ground further comprises: The fifth switch is closed so that the two ends of the third resistor module are electrically connected to the positive electrode of the battery to be charged and the negative electrode of the power supply end respectively.

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