Battery high-voltage system and electric energy equipment

Abstract

The utility model provides a battery high-voltage system and electric energy equipment. The battery high-voltage system comprises a high-voltage module (1), the high-voltage module (1) comprises M battery units (11), a resistor branch (3) and a voltage dividing contactor (12), and M is larger than or equal to 2. The voltage dividing contactor (12) is connected in series between any two adjacent battery units (11), and the resistor branch (3) is connected in parallel with the voltage dividing contactor (12). The resistance branch circuit (3) connected in parallel with the voltage-dividing contactor (12) is utilized to ensure that the potential difference between the two ends of the voltage-dividing contactor (12) is reduced when the voltage-dividing contactor (12) is switched off, so that when the voltage-dividing contactor (12) is switched on again, overlarge electrical impact cannot be generated in a battery high-voltage system, electronic devices in the battery high-voltage system are prevented from being damaged due to overlarge electrical impact, and the service life of the battery high-voltage system is prolonged. And the service life of the battery high-voltage system is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a battery high-voltage system and an electric energy device. BACKGROUND

[0002] In the field of new energy vehicles, power batteries as the core power source, the voltage level generally reaches hundreds of volts, even much higher than the human body safety voltage 60 volts. Such a battery high-voltage system brings strong power, but also potential safety hazards. In some battery high-voltage systems, in order to improve safety, a voltage dividing contactor is arranged in the middle of the battery unit, so that the voltage dividing contactor can be disconnected to divide the entire battery high-voltage system into multiple sub-power modules under certain conditions, thereby reducing the voltage of the entire battery high-voltage system.

[0003] However, due to the existence of parasitic capacitance in the high-voltage power supply, instantaneous voltage or current impact will be generated when it is turned on, which is easy to cause damage to the electronic devices in the battery high-voltage system, thereby bringing the risk of damage to the entire battery high-voltage system. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery high-voltage system and an electric energy device to solve the problem of electrical impact caused by parasitic capacitance in the high-voltage power supply, which leads to damage to the battery high-voltage system.

[0005] In a first aspect, the present application provides a battery high-voltage system, comprising:

[0006] a high-voltage module 1, the high-voltage module 1 comprising M battery units 11, a resistance branch 3 and a voltage dividing contactor 12, M≥2;

[0007] The voltage dividing contactor 12 is connected in series between any two adjacent battery units 11, and the resistance branch 3 is connected in parallel with the voltage dividing contactor 12.

[0008] In a possible implementation, the resistance branch 3 comprises:

[0009] a resistance module 31, the resistance module 31 comprising one resistance;

[0010] Or, the resistance module 31 comprises a plurality of resistances, and the plurality of resistances are connected in series and / or in parallel.

[0011] In a possible implementation, the resistance branch 3 further comprises a first switch 32.

[0012] The first switch 32 is connected in series with the resistance module 31, and is used to control the conduction or disconnection of the resistance module 31.

[0013] In a possible implementation, the resistance branch 3 has a resistance value in a target resistance value interval, a lower limit of the target resistance value interval is greater than or equal to the first resistance value, and an upper limit of the target resistance value interval is less than or equal to the second resistance value.

[0014] The first resistance value is a resistance value determined based on a voltage plateau interval of the high-voltage module 1 and a safety current.

[0015] The second resistance value is a resistance value determined based on a voltage plateau interval of the high-voltage module 1, an insulation resistance value range triggering an insulation warning, and a measurement voltage range corresponding to the insulation resistance value range.

[0016] In a possible implementation, the resistance branch 3 has a resistance value in a target resistance value interval, a lower limit of the target resistance value interval is greater than or equal to the first resistance value, and an upper limit of the target resistance value interval is less than or equal to the second resistance value.

[0017] The first resistance value is 6KΩ, and the second resistance value is 500MΩ.

[0018] In a possible implementation, the second resistance value is 100MΩ.

[0019] In a possible implementation, the resistance branch 3 is arranged in the voltage divider contactor 12.

[0020] In a possible implementation, the resistance branch 3 is arranged on a printed circuit board, and the printed circuit board is connected in parallel with the corresponding voltage divider contactor 12.

[0021] In a possible implementation, the printed circuit board is a flexible printed circuit board, and the resistance branch 3 is attached to the flexible printed circuit board.

[0022] In a possible implementation, the high-voltage module 1 includes a plurality of resistance branches 3, and each resistance branch 3 is connected in parallel with a corresponding voltage divider contactor 12.

[0023] In a possible implementation, the high-voltage system of the battery further includes:

[0024] The management module 2 is connected with the high-voltage module 1, and is configured to monitor and / or manage the high-voltage module 1.

[0025] In a possible implementation, the management module 2 includes:

[0026] The battery information acquisition unit 26 is connected in parallel with the battery unit, and is configured to acquire information of the battery unit.

[0027] In a possible implementation, the management module 2 includes:

[0028] A control unit 27 is configured to control the charge and discharge state of the high-voltage module 1.

[0029] In a possible implementation, the management module 2 comprises:

[0030] A first insulation branch 21, a second insulation branch 22, and an insulation monitoring device 23, wherein one end of the first insulation branch 21 is connected to the positive electrode of the high-voltage module 1, one end of the second insulation branch 22 is connected to the negative electrode of the high-voltage module 1, and the other end of the first insulation branch 21 and the other end of the second insulation branch 22 are both connected to the insulation monitoring device 23, thereby forming an insulation monitoring loop of the high-voltage module 1.

[0031] The insulation monitoring device 23 is configured to monitor the insulation of the high-voltage module 1 by the voltage of the first insulation branch 21 and the second insulation branch 22.

[0032] In a possible implementation, the management module 2 further comprises:

[0033] A second switch 24, one end of the second switch 24 is connected to one end of the first insulation branch 21, and the other end of the second switch 24 is connected to the positive electrode of the high-voltage module 1.

[0034] A third switch 25, one end of the third switch 25 is connected to one end of the second insulation branch 22, and the other end of the second switch 24 is connected to the negative electrode of the high-voltage module 1.

[0035] The second switch 24 and the third switch 25 are configured to control whether the insulation monitoring loop is turned on.

[0036] In a second aspect, the present application provides an electric energy device, which comprises a device main body and the battery high-voltage system according to any possible implementation of the first aspect.

[0037] The battery high-voltage system and the electric energy device provided by the present application, the battery high-voltage system comprises: a high-voltage module, the high-voltage module comprises M (M≥2) battery units, a resistance branch, and a voltage dividing contactor. The voltage dividing contactor is connected in series between any two adjacent battery units, and the resistance branch is connected in parallel with the voltage dividing contactor. By using the resistance branch connected in parallel with the voltage dividing contactor, the potential difference between the two ends of the voltage dividing contactor after being disconnected can be reduced, so that when the voltage dividing contactor is reconnected, there will be no excessive electrical shock in the battery high-voltage system, preventing the electronic devices in the battery high-voltage system from being damaged due to excessive electrical shock, thereby improving the service life of the battery high-voltage system. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0039] Figure 1 A circuit structure schematic diagram of an existing battery high-voltage system;

[0040] Figure 2 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 1 ;

[0041] Figure 3 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 2 ;

[0042] Figure 4 A schematic diagram of an insulation monitoring architecture provided by an embodiment of the application;

[0043] Figure 5 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 3 ;

[0044] Figure 6 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 4 ;

[0045] Figure 7 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 5 ;

[0046] Figure 8 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 6 ;

[0047] Figure 9 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 7 ;

[0048] Figure 10 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 8 ;

[0049] Figure 11 A circuit structure schematic diagram of a battery high-voltage system provided by an embodiment of the application Figure 9 .

[0050] BRIEF DESCRIPTION OF DRAWINGS

[0051] 1 - high-voltage module; 11 - battery cell; 12 - voltage divider contactor;

[0052] 2-Management module; 21-First insulated branch; 22-Second insulated branch; 23-Insulation monitoring device; 24-Second switch; 25-Third switch; 26-Battery information acquisition unit; 27-Control unit;

[0053] 3-Resistor branch; 31-Resistor module; 32-First switch.

[0054] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0055] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0056] Figure 1 A schematic diagram of the circuit structure of an existing high-voltage battery system, such as... Figure 1 As shown, common high-voltage battery systems currently include multiple battery cells connected in series, enabling the system to provide high voltage. It should be understood that this application does not limit the number of battery cells included in the high-voltage battery system. Figure 1 This is a schematic diagram using two battery cells as an example.

[0057] Currently, in some high-voltage battery systems, to improve safety, voltage divider contactors are installed between battery cells. These contactors can be disconnected under certain circumstances to divide the entire high-voltage battery system into multiple sub-power modules, thereby reducing the voltage of the entire high-voltage system. For example, Figure 1 After the voltage divider contactor is disconnected, each of the two battery cells in the system acts as a sub-power module to supply power to the outside.

[0058] However, due to the parasitic capacitance of the sub-power module, such as... Figure 1 As shown by C1 to C4 in the diagram, C1 and C3 represent the equivalent capacitance generated between the two ends of the upper battery cell and the low-voltage ground (PE). C2 and C4 represent the equivalent capacitance generated between the two ends of the lower battery cell and the low-voltage ground (PE). Therefore, when the voltage divider contactor is in a state of disconnection and reconnection, the presence of parasitic capacitance will generate instantaneous electrical surges such as voltage or current, which can easily damage electronic components in the battery high-voltage system, thereby posing a risk of damage to the entire battery high-voltage system.

[0059] To solve the above problems, the application provides a battery high-voltage system. By connecting a resistance branch in parallel with the voltage divider contactor, when the voltage divider contactor is disconnected, the resistance branch can reduce the potential difference across the disconnected voltage divider contactor, so that when the voltage divider contactor is reconnected, no excessive electrical shock will occur in the battery high-voltage system, preventing damage to electronic devices in the battery high-voltage system due to excessive electrical shock, thereby prolonging the service life of the battery high-voltage system.

[0060] The technical solutions of the application and how the technical solutions solve the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described again in some examples. The embodiments of the application will be described below with reference to the drawings.

[0061] Figure 2 A circuit structure diagram of a battery high-voltage system provided by an embodiment of the application Figure 1 As shown in Figure 2 , the battery high-voltage system comprises a high-voltage module 1.

[0062] The high-voltage module 1 comprises M battery units 11, a resistance branch 3, and a voltage divider contactor 12. Wherein, M≥2, the specific value can be set according to the actual power demand. In this embodiment, all examples are illustrated by taking the high-voltage module 1 comprising two battery units 11 as an example.

[0063] Wherein, "M series of battery units" means that the high-voltage module contains multiple battery units, which are connected together in series to provide power. The battery unit 11 can include one battery or multiple batteries, and the multiple batteries can be connected in series, parallel, or a combination of series and parallel.

[0064] The voltage divider contactor 12 is connected in series between any two adjacent battery units 11. The voltage divider contactor 12 is an electrical element, which mainly functions to distribute voltage between battery units and control the on-off of current when needed. Connecting multiple battery units in series can significantly increase the total voltage and capacity of the high-voltage module, meeting the demand for high power and high energy. At the same time, the setting of the voltage divider contactor enables the high-voltage module to more flexibly manage the working state and voltage level of each battery unit.

[0065] In this embodiment, a resistance branch 3 is newly introduced and connected in parallel with the voltage divider contactor 12.

[0066] As shown in Figure 2As shown, when the voltage divider contactor 12 is reconnected after being disconnected, the adjacent battery unit 11 is connected through the voltage divider contactor 12 to form a closed high-voltage power supply loop. In this scenario, the resistance branch 3 can reduce the potential difference between the two ends after the voltage divider contactor is disconnected, so that when the voltage divider contactor is reconnected, there will be no excessive electrical shock in the battery high-voltage system, preventing the electronic devices in the battery high-voltage system from being damaged due to excessive electrical shock, thereby improving the service life of the battery high-voltage system.

[0067] Figure 3 A circuit structure of a battery high-voltage system provided by the embodiment of the present application Figure 2 As shown, Figure 3 As shown, when the voltage divider contactor 12 is disconnected, the adjacent battery unit 11 forms a loop through the resistance branch 3, so that other electronic devices in the battery high-voltage system can continue to work when the voltage divider contactor 12 is disconnected.

[0068] That is, the resistance branch 3 provides a backup current path for the high-voltage module 1. When the voltage divider contactor 12 is disconnected, that is, a certain battery unit 11 is isolated or disconnected, in this case, the resistance branch 3 can keep the loop in a conductive state, so that other electronic devices on the loop can continue to work.

[0069] It should be understood that the above-mentioned resistance branch 3 can correspond to the voltage divider contactor 12 one by one, that is, one voltage divider contactor 12 is connected in parallel with one resistance branch 3, or some voltage divider contactors 12 are provided with resistance branches 3. In this example, which voltage divider contactors 12 are provided with resistance branches 3 can be set according to actual needs. For example, the resistance branch 3 can be provided for the voltage divider contactor 12 with high shutdown frequency to prevent the electronic devices in the battery high-voltage system from being damaged due to excessive electrical shock, thereby improving the service life of the battery high-voltage system.

[0070] The embodiment does not limit the composition of the above-mentioned resistance branch 3. In some embodiments, the resistance branch 3 can include a resistance module 31; the resistance module 31 includes at least one resistance. That is, the resistance module 31 can include one or more resistances. When it includes multiple resistances, the multiple resistances can be connected in series, or connected in parallel, or connected in series and parallel, which is related to the resistance value required to be provided by the resistance branch 3.

[0071] It should be understood that the present application does not limit the implementation mode of the parallel connection of the above-mentioned resistance branch 3 and the corresponding voltage divider contactor 12.

[0072] For example, the resistance branch 3 can be arranged on a printed circuit board, which is connected in parallel with the corresponding voltage divider contactor 12. That is, the resistance branch 3 can be arranged on a separate Printed Circuit Board (PCB) plate, which is connected in parallel with the voltage divider contactor 12. This design provides higher flexibility and maintainability, because the resistance branch 3 as a separate module can be easily replaced or upgraded without the need to modify the entire voltage divider contactor 12. At the same time, the design of the PCB plate also makes the layout and wiring of the resistance branch 3 more reasonable, which is beneficial to improve the electrical performance and reduce interference.

[0073] Optionally, the printed circuit board can be a Flexible Printed Circuit (FPC), and the resistance branch 3 is mounted on the FPC. The FPC has the characteristics of thin, light, flexible, and bendable, which can adapt to various complex installation environments and space limitations. The resistance branch 3 can be directly mounted on the FPC by means of surface mount welding. This mounting method has the advantages of reliable connection, small size, and light weight. At the same time, the flexible characteristics of the FPC also make the resistance branch 3 better adapt to the bending and deformation of the circuit board, improving the reliability and durability of the system.

[0074] In the above implementation manner, the resistance branch 3 and the voltage divider contactor 12 can be two independent individuals. In some embodiments, the resistance branch 3 can be arranged in the voltage divider contactor 12. That is, the resistance branch 3 can be integrated into the voltage divider contactor 12 as a component of the voltage divider contactor 12 during the design of the circuit.

[0075] This integrated structure design means that the resistance branch 3 and the voltage divider contactor 12 are physically and electrically closely connected, and they together constitute a complete module. This design has the advantages of compact structure, convenient installation, stable electrical performance, etc., because the connection between the resistance branch 3 and the voltage divider contactor 12 is internally implemented, which reduces external wiring and interfaces, thereby reducing the failure rate and maintenance cost.

[0076] In the embodiment, the battery high-voltage system provided by the application is used for the high-voltage module with the voltage divider contactor arranged between the series-connected battery units, and the resistance branch parallel to the voltage divider contactor is used to ensure that the potential difference between the two ends of the voltage divider contactor can be reduced when the voltage divider contactor is disconnected, so that when the voltage divider contactor is reconnected, an excessive electrical shock will not be generated in the battery high-voltage system, and damage of the electronic devices in the battery high-voltage system caused by the excessive electrical shock is prevented, and the service life of the battery high-voltage system is improved. In addition, the application only connects the resistance branch in parallel to the voltage divider contactor, and does not need to modify other parts of the circuit, thereby reducing the complexity of circuit design and production.

[0077] In some embodiments, the resistance branch 3 can be located in a target resistance value interval, where the lower limit of the target resistance value interval is greater than or equal to the first resistance value, and the upper limit is less than or equal to the second resistance value.

[0078] The first resistance value is a resistance value determined based on the voltage platform interval of the high-voltage module 1 and a safety current.

[0079] It can be understood that the voltage platform interval refers to a voltage range corresponding to a relatively stable stage of the high-voltage module 1 in the discharging process. In this interval, the voltage of the battery changes little, and a relatively stable power output can be provided. A certain value in this interval is used in the calculation process to ensure the accuracy of the resistance value determination.

[0080] The safety current can be set according to actual needs. For example, the minimum current 1 mA that can be felt by a living body can be used as the safety current. In this implementation manner, the first resistance value can be greater than or equal to Vbat / 1 mA.

[0081] Wherein, Vbat represents the voltage level that the high-voltage module 1 can output in the normal working state, that is, a voltage value in the voltage platform interval. For example, assuming that Vbat is 400 V, then the first resistance value is 400 V / 1 mA = 400 kΩ.

[0082] In this example, the lower limit value of the target resistance value interval can be 400 kΩ, or a resistance value higher than the high value.

[0083] For example, the lower limit value can be a resistance value of MΩ (megaohm) or more, so as to effectively reduce the occurrence of arc phenomenon (i.e. arc discharge, which is a phenomenon that can damage the circuit or cause a fire) of the high-voltage module 1. For example, the lower limit value can be 1 MΩ.

[0084] The second resistance value is a resistance value determined based on the voltage platform interval of the high-voltage module 1 and the insulation resistance value range for triggering the insulation alarm, and the measurement voltage range corresponding to the insulation resistance value range.

[0085] Understandably, while battery high-voltage systems provide powerful energy to electrical equipment, they also present potential safety hazards. A decline in the insulation performance of the battery high-voltage system can lead to leakage. Therefore, effective insulation monitoring of the battery high-voltage system is a crucial step in ensuring the safe operation of electrical equipment.

[0086] The bridge method, a common insulation monitoring scheme, is widely used in the insulation status assessment of battery systems. Based on the bridge balance principle, this method constructs a bridge circuit and adjusts its variable components to achieve a balanced state. In this balanced state, based on the specific configuration and component parameters of the bridge, the insulation resistance values ​​of the positive and negative buses of the battery system to ground can be accurately calculated, thereby enabling real-time monitoring of the insulation status.

[0087] Taking the insulation monitoring of high-voltage module 1 in a battery high-voltage system using the bridge method as an example, Figure 4 This is a schematic diagram of an insulation monitoring architecture provided in an embodiment of this application. Figure 4 As shown, the insulation monitoring architecture may include: a first insulation branch 21, a second insulation branch 22, and an insulation monitoring device 23.

[0088] One end of the first insulating branch 21 is connected to the positive terminal of the high-voltage module 1, one end of the second insulating branch 22 is connected to the negative terminal of the high-voltage module 1, and the other ends of the first insulating branch 21 and the second insulating branch 22 are both connected to the insulation monitoring device 23, thus forming the insulation monitoring circuit of the high-voltage module 1.

[0089] The first insulating branch 21 and the second insulating branch 22 are used by the insulation monitoring device 23 to detect the voltage in the insulating branch and to calculate the equivalent insulation resistance based on the detected voltage value, thereby determining the insulation status of the insulation monitoring circuit. The first insulating branch 21 and the second insulating branch 22 also prevent sudden voltage changes in the insulation monitoring circuit when the voltage divider contactor 12 is opened or closed, thus preventing any impact on the accuracy of the insulation monitoring device 23. Simultaneously, the resistance of the first insulating branch 21 and the second insulating branch 22 limits the current magnitude, preventing damage to the battery high-voltage system 2 due to excessive current.

[0090] The first insulation branch 21 and the second insulation branch 22 can be pre-designed circuits containing components such as resistors. The resistance values ​​are known and can be used as reference resistors to help the insulation monitoring device more accurately measure and calculate the insulation resistance of the high-voltage module 1.

[0091] It can be understood that, during the operation of the high-voltage module 1, the insulation performance may be reduced due to various reasons, thereby causing electrical faults and even fire hazards. Through monitoring and early warning, potential insulation faults of the battery high-voltage system can be found and handled in time, preventing the occurrence of battery damage, fire hazards and other dangerous situations caused by insulation problems, and improving safety.

[0092] The insulation monitoring device 23 is used to monitor the insulation of the high-voltage module 1 through the voltage of the first insulation branch 21 and the second insulation branch 22.

[0093] It can be understood that the insulation monitoring device 23 is a device for monitoring the insulation state of the high-voltage module 1. The insulation monitoring device 23 is connected to a ground reference point (PE). The insulation monitoring device 23 evaluates the insulation state of the entire insulation monitoring loop by monitoring the resistance change of the insulation branch.

[0094] The working principle of insulation monitoring is as follows: Because the high-voltage module 1 forms a certain voltage distribution on the two insulation branches, the insulation monitoring device 23 detects the size of the voltage on the insulation branch, and further infers and calculates the size of the equivalent insulation resistance Rp and the equivalent insulation resistance Rn. When the insulation resistance is lower than the preset safety threshold, the insulation monitoring device 23 can trigger an alarm function to notify the operator to take corresponding measures, or notify the battery management system to take corresponding measures, or provide an indication of the fault branch. It should be noted that the equivalent insulation resistance referred to in this application is not an actual resistance element in the circuit.

[0095] In the high-voltage module 1, the insulation resistance value is a key parameter, and its stability is directly related to the accuracy of the insulation monitoring of the high-voltage module 1. When the insulation resistance value is too low, the insulation alarm may be triggered, which is usually an important warning signal that the circuit has a risk of leakage or short circuit. In order to prevent false alarms caused by fluctuations in the insulation resistance value due to the resistance value of the resistance branch 3, the range of insulation resistance values that trigger the insulation alarm is determined to determine the maximum resistance value of the resistance branch 3 that can be set, so as to avoid the problem of reduced insulation monitoring accuracy caused by setting the resistance branch 3.

[0096] In addition, the resistance branch 3 will form a voltage division effect with the insulation resistance value of the high-voltage module 1 and the resistance value of the insulation branch, resulting in a decrease in the actual voltage distribution on the high-voltage module 1 and the insulation branch. For the insulation monitoring device 23 which relies on accurate voltage readings to determine the insulation state, this voltage reduction directly means a decrease in signal strength received. Once the voltage reading is lowered due to the voltage division effect, the insulation monitoring device 23 may not be able to accurately capture the total voltage of the high-voltage module 1 and the true voltage of the insulation branch, which will seriously affect the accuracy of its judgment of the insulation state, and even may cause false or missed insulation fault reports.

[0097] In order to ensure that the insulation monitoring device 23 can accurately calculate the values of Rp and Rn, avoid false positives or false negatives due to sampling errors, the voltage platform interval of the high-voltage module 1 and the insulation resistance range triggering insulation alarm, and the measurement voltage range corresponding to the insulation resistance range are used to determine the second resistance value, so as to determine the upper limit value of the target resistance value interval of the resistance branch 3, so as to ensure that the resistance value of the resistance branch 3 will not affect the insulation monitoring.

[0098] For example, according to the principle of insulation monitoring, the following voltage calculation formula can be derived:

[0099] The voltage V of the high-voltage module 1 obtained by the insulation monitoring device 23 can be shown in the following formula ①:

[0100]

[0101] Where R refers to the resistance value of the resistance branch 3, and V refers to the total voltage of the high-voltage module 1 obtained by the insulation monitoring device 23. Because the resistance value of the resistance branch 3 will divide the voltage of the high-voltage module 1, there will be a certain difference between the total voltage of the high-voltage module 1 obtained by the insulation monitoring device 23 and the actual total voltage Vbat of the high-voltage module 1.

[0102] The first insulation branch voltage V1 can be shown in the following formula ②, and the second insulation branch voltage V2 can be shown in the following formula ③:

[0103]

[0104] In the insulation monitoring process, the insulation monitoring device 23 can calculate Rp and Rn according to V, V1 and V2, so as to determine whether there is an insulation fault according to Rp and Rn. When R is too large, V, V1 and V2 will be very low, and this error will cause the calculation error of Rp and Rn to increase, thereby causing false positives or false negatives of insulation faults.

[0105] Because the first insulation branch 21 and the second insulation branch 22 are pre-set branches, their corresponding equivalent resistances R1 and R2 are known values. Therefore, in order to avoid false positives or false negatives of insulation faults, the resistance value R of the above three formulas can be obtained by back calculation based on the voltage platform interval of the high-voltage module 1 and the insulation resistance range triggering insulation alarm, and the measurement voltage range corresponding to the insulation resistance range, that is, the second resistance value.

[0106] For example, the equivalent insulation resistance (Rp or Rn) between the positive or negative electrode of the high-voltage module 1 and the low-voltage ground needs to be greater than 100Ω / V, V1 and V2 need to be greater than 10V, assuming Vbat=400V, R1=2MΩ, R2=2MΩ, then according to formulas ①~③, R=1.4MΩ can be calculated. That is, the second resistance value is 1.4 MΩ.

[0107] In this example, the target resistance interval can be 1MΩ~1.4MΩ, 400KΩ~1.1MΩ, or 1MΩ~1.2MΩ, as long as the minimum value of the target value interval is greater than the first resistance value and the maximum value is less than the second resistance value, which is not limited in the present application.

[0108] It can be understood that, in general, the minimum resistance of the insulation monitoring loop is usually set to 100Ω / V, and the corresponding current value is 10mA. Assuming that the voltage value selected based on the voltage platform interval of the high-voltage module 1 is 60V, the minimum value of the resistance branch 3 can be 60V / 10mA=6KΩ.

[0109] In addition, Rp and Rn are usually greater than 100MΩ, and the resistance branch 3 is connected in series with Rp and Rn. Therefore, the maximum resistance of the resistance branch 3 and Rp and Rn can be as follows: R=Rp_max=Rn_max.

[0110] Assuming that the maximum resistance of Rp and Rn is 100MΩ, the maximum resistance of the resistance branch 3 can be 100MΩ accordingly. That is, the second resistance value can be 100MΩ.

[0111] Assuming that the maximum resistance of Rp and Rn is 500MΩ, the maximum resistance of the resistance branch 3 can be 500MΩ accordingly. That is, the second resistance value can be 500MΩ.

[0112] That is, in some embodiments, the first resistance value is 6KΩ and the second resistance value is 500MΩ. In some embodiments, the second resistance value is 100MΩ. For example, it can be 1MΩ to 10MΩ.

[0113] In some embodiments, in the case of selecting a resistance branch 3 with a large resistance value (such as MΩ level), the above resistance branch 3 can divide the voltage with Rp and Rn together, and reduce the voltage across the voltage divider contactor 12 to 1 / 3 of the original, which protects the electronic devices in the battery high-voltage system. For example, assuming that the total voltage of the original high-voltage module 1 is 600V, after introducing the resistance branch 3, the voltage across the voltage divider contactor 12 can be reduced from 600V to 200V, reducing the electrical impact on the electronic devices at the moment of closing the voltage divider contactor 12.

[0114] In some embodiments, in the case of selecting a resistance branch 3 with a large resistance value (such as MΩ level), the above resistance branch 3 can also function as a current limiter. Specifically as follows:

[0115] Figure 5 A circuit structure of a battery high-voltage system provided by an embodiment of the present application Figure 3When the high-voltage module 1 is short-circuited (i.e. Rp, Rn is small, close to 0), the voltage divider contactor 12 needs to be disconnected for safety considerations, at this time, due to the existence of the parallel resistance branch 3, the loop is still in the on state, and the circuit principle is as shown in Figure 5 At this time, the current flowing through the high-voltage module 1 is I=total voltage of the high-voltage module 1 Vbat / resistance value R of the resistance branch 3, and the resistance branch 3 can play a role of current limiting, that is, even in the case of high total voltage of the high-voltage module 1 (such as 800V), the current flowing through the battery is only in the order of mA, which will not cause overcurrent risk to the battery, and the current is also lower than the safety current threshold that can cause harm to the human body, and there is no risk of electric shock when the human body touches the positive and negative electrodes of the high-voltage module 1 at the same time.

[0116] Further, on the basis of the above embodiment, the battery high-voltage system of the embodiment of the application further comprises:

[0117] The management module 2 is connected with the high-voltage module 1, and is used for monitoring and / or managing the high-voltage module 1. For example, the management module 2 can perform one or more operations such as monitoring the key parameters such as voltage, current, temperature, etc. of the high-voltage module 1, performing charging and discharging control, balance management, thermal management, and fault warning, etc. on the high-voltage module 1. In some embodiments, the management module 2 can also be referred to as a battery management system (BMS).

[0118] Through the above-mentioned manner of adding the resistance branch 3, when the voltage divider contactor is connected again after being disconnected, the resistance branch 3 can reduce the potential difference at both ends after the voltage divider contactor is disconnected, so that when the voltage divider contactor is connected again, there will be no excessive electrical shock in the battery high-voltage system, preventing the management module 2 in the battery high-voltage system from being damaged due to electrical shock, and improving the service life of the management module 2.

[0119] In addition, the setting of the resistance branch 3 makes the battery high-voltage system 2 provide a backup current path, ensuring that the loop can still maintain the on state when the voltage divider contactor 12 is disconnected, so that the management module 2 can still monitor and / or manage the high-voltage module 1 when the voltage divider contactor 12 is disconnected, effectively improving the safety of the system.

[0120] The following exemplary gives some implementation ways of the management module 2:

[0121] Implementation way 1

[0122] Figure 6 A circuit structure schematic of a battery high-voltage system provided by the embodiment of the application Figure 4 As shown in Figure 6As shown, for example, the management module 2 comprises a battery information collection unit 26 connected in parallel with the battery unit 11, for collecting information of the battery unit 11. For example, one or more of voltage, current, temperature, etc.

[0123] In some embodiments, the battery information collection unit 26 can also be referred to as a battery information collector (BIC).

[0124] It should be understood that the above-mentioned battery information collection unit 26 can correspond to the battery unit 11 one by one, that is, one battery information collection unit 26 is connected in parallel with one battery unit 11, or part of the battery units 11 are provided with the battery information collection unit 26, or multiple battery units 11 share one battery information collection unit 26, etc. In this example, which battery units 11 are provided with the battery information collection unit 26 can be set according to actual needs.

[0125] That is, the management module 2 can comprise at least two battery information collection units 26, each of which is connected in parallel with at least one battery unit 11 at one end of the voltage dividing contactor 12, and the battery information collection units 26 are respectively arranged at both ends of the voltage dividing contactor 12.

[0126] Implementation mode 2

[0127] Figure 7 A circuit structure schematic of a battery high-voltage system provided by an embodiment of the present application Figure 5 As shown, for example, the management module 2 comprises a battery information collection unit 26 connected in parallel with the battery unit 11, for collecting information of the battery unit 11. For example, one or more of voltage, current, temperature, etc. Figure 7 As shown, for example, the management module 2 comprises a battery information collection unit 26 connected in parallel with the battery unit 11, for collecting information of the battery unit 11. For example, one or more of voltage, current, temperature, etc.

[0128] For another example, the management module 2 can comprise electronic devices for realizing insulation monitoring function, for example:

[0129] Referring to the foregoing Figure 4 , the management module 2 can comprise the first insulation branch 21, the second insulation branch 22 and the insulation monitoring device 23 as mentioned above; one end of the first insulation branch 21 is connected with the positive electrode of the high-voltage module 1, one end of the second insulation branch 22 is connected with the negative electrode of the high-voltage module 1, the other end of the first insulation branch 21 and the other end of the second insulation branch 22 are both connected with the insulation monitoring device 23, thereby forming an insulation monitoring loop of the high-voltage module 1.

[0130] Figure 8 A circuit structure schematic of a battery high-voltage system Figure 6 As shown in Figure 8 When the voltage divider contactor 12 is turned on, the battery unit 11 forms a closed insulation monitoring loop with the first insulation branch 21, the second insulation branch 22, and the insulation monitoring device 23 through the voltage divider contactor 12.

[0131] Figure 9 A circuit structure schematic of a battery high-voltage system Figure 7 As shown in Figure 9 When the voltage divider contactor 12 is turned off, the battery unit 11 forms a closed insulation monitoring loop with the first insulation branch 21, the second insulation branch 22, and the insulation monitoring device 23 through the resistance branch 3 connected in parallel with the voltage divider contactor 12.

[0132] That is, when the voltage divider contactor 12 is turned off, that is, a certain battery unit 11 is isolated or turned off, in this case, the resistance branch 3 can maintain the conduction state of the insulation monitoring loop, so that the battery high-voltage system 2 can still continue to work, and the insulation state of the entire high-voltage module 1 is monitored.

[0133] That is, the resistance branch 3 is provided, so that the battery high-voltage system 2 provides a backup current path, ensuring that the insulation monitoring loop can still maintain a conduction state when the voltage divider contactor 12 is turned off.

[0134] The insulation monitoring device 23 is used to monitor the insulation of the high-voltage module 1 through the voltage of the first insulation branch 21 and the second insulation branch 22.

[0135] It can be understood that the insulation monitoring device 23 is a device for monitoring the insulation state of the high-voltage module 1, and the insulation monitoring device 23 and the two insulation branches together form the battery high-voltage system 2. The insulation monitoring device 23 is connected to a ground reference point (PE), and the insulation monitoring device 23 evaluates the insulation state of the entire insulation monitoring loop by monitoring the resistance change of the insulation branch.

[0136] The working principle of the battery high-voltage system 2: after the battery high-voltage system starts insulation monitoring, the insulation monitoring device 23 starts to work, because a certain voltage distribution will be formed on the two insulation branches of the high-voltage module 1, the insulation monitoring device 23 detects the size of the voltage on the insulation branch, and further infers and calculates the size of the equivalent insulation resistance Rp and the equivalent insulation resistance Rn. When the insulation resistance is lower than the preset safety threshold, the insulation monitoring device 23 can trigger an alarm function to notify the operator to take corresponding measures, or to notify the battery management system to take corresponding measures, or to provide an indication of the fault branch. It should be noted that the equivalent insulation resistance involved in the present application is not an actual resistance element in the circuit.

[0137] Further, on the basis of the above-mentioned embodiments, the embodiments of the present application further provide a switch for controlling whether the resistance branch 3 is connected in the circuit.

[0138] The first mode: a control switch is added in the resistance branch.

[0139] Figure 10 A circuit structure schematic of a battery high-voltage system provided by the embodiments of the present application Figure 8 As shown in Figure 10 The resistance branch 3 further comprises a first switch 32.

[0140] The first switch 32 is connected in series with the resistance module 31, and is used for controlling whether the resistance module 31 is connected in the insulation monitoring circuit.

[0141] It can be understood that the control switch (the first switch 32) can be added in the resistance branch 3, and the first switch 32 can control the resistance module 31 to be turned on or turned off. That is, whether the resistance module 31 is connected in the circuit is controlled.

[0142] Optionally, when the voltage divider contactor 12 is disconnected, if it is needed to close the voltage divider contactor 12, the resistance module 31 is first turned on through the first switch 32, so that when the voltage divider contactor 12 is connected again after being disconnected, the resistance branch 3 can reduce the potential difference between the two ends of the voltage divider contactor after being disconnected, so that when the voltage divider contactor 12 is connected again, an excessive electrical shock will not be generated in the battery high-voltage system, thereby preventing the electronic devices in the battery high-voltage system from being damaged due to the excessive electrical shock.

[0143] Alternatively, when the voltage divider contactor 12 is disconnected, if it is needed to manage the high-voltage module 1, the first switch 32 is controlled to be in a closed state, and at this time, the circuit can be in a turned-on state through the resistance branch 3, so as to realize the management of the high-voltage module 1. Taking the insulation monitoring as an example, as shown in Figure 10 In this implementation mode, the insulation monitoring device 23 can realize the insulation monitoring of the battery unit through the insulation monitoring circuit.

[0144] Optionally, when the voltage divider contactor 12 is disconnected, if it is not needed to close the voltage divider contactor 12, or if it is not needed to manage the high-voltage module 1, the first switch 32 can be controlled to be in an open state, and at this time, the circuit is in an open state, thereby avoiding that the resistance branch 3 and other electronic devices (for example, the management module 2) are always connected between the two ends of the high-voltage module 1, and continuously consume the power of the high-voltage module 1, thereby causing the high-voltage module 1 to be fed.

[0145] The above diagram only exemplarily shows the position of the first switch 32 arranged on the resistance branch 31, but the present application does not limit the position of the first switch 32. For example, the position of the first switch 32 before the resistance module 31 can be interchanged.

[0146] The second way is to add a control switch in the management module 2 to turn on the circuit when the high-voltage module 1 needs to be managed, and to turn off the connection when management is not needed, thereby reducing the consumption of the high-voltage module 1.

[0147] For example, a control switch is added in the insulation monitoring circuit, Figure 11 A circuit structure schematic of a battery high-voltage system provided by the embodiment of the present application Figure 9 As shown in Figure 11 The management module 2 further includes:

[0148] The second switch 24 has one end connected to one end of the first insulation branch 21, and the other end connected to the positive electrode of the high-voltage module 1.

[0149] The third switch 25 has one end connected to one end of the second insulation branch 22, and the other end connected to the negative electrode of the high-voltage module 1.

[0150] The second switch 24 and the third switch 25 are used to control whether the insulation monitoring circuit is turned on.

[0151] It can be understood that when insulation monitoring is needed, the second switch 24 and the third switch 25 are respectively controlled to be closed, so that the insulation monitoring circuit is in a conducting state, thereby enabling the insulation monitoring device 23 to realize insulation monitoring of the battery cell 11 through the insulation monitoring circuit.

[0152] When insulation detection is not needed, the second switch 24 and the third switch 25 are respectively controlled to be opened, thereby avoiding the first insulation branch 21, the second insulation branch 22, and the insulation monitoring device 23 being always connected across the high-voltage module 1, which continuously consumes the power of the high-voltage module 1 and causes the high-voltage module 1 to be fed.

[0153] It should be understood that although the above example is exemplified by the second switch 24 and the third switch 25, in actual implementation, a switch (for example, only the second switch 24 or only the third switch 25) can be added to one of the insulation branches, so that when the voltage dividing contactor 12 is turned off, if insulation detection is not needed, the insulation monitoring circuit is in an open state through the switch, thereby avoiding the first insulation branch 21, the second insulation branch 22, and the insulation monitoring device 23 continuously consuming the power of the high-voltage module.

[0154] In addition, the above-mentioned figure only exemplarily shows the positions of the second switch 24 and the third switch 25 on the corresponding insulation branch, but the present application does not limit the positions thereof. For example, the second switch 24 can also be arranged between the first insulation branch 21 and the insulation monitoring device 23.

[0155] The third mode: a control switch is added to the resistance branch 3, and a control switch is added to the insulation branch, so that the circuit can be more flexibly controlled according to the actual needs.

[0156] For example, when the voltage divider contactor 12 is disconnected, if it is needed to close the voltage divider contactor 12, the resistance module 31 is turned on through the first switch 32, so that when the voltage divider contactor 12 is connected again after being disconnected, the resistance branch 3 can reduce the potential difference between the two ends of the voltage divider contactor 12 after being disconnected, so that when the voltage divider contactor 12 is connected again, there will be no excessive electrical shock in the high-voltage system of the battery, preventing the electronic devices in the high-voltage system of the battery from being damaged due to excessive electrical shock. In this process, if it is needed to monitor the insulation of the high-voltage module 1, the second switch 24 and the third switch 25 can be closed, and if it is not needed to monitor the insulation of the high-voltage module 1, the second switch 24 and the third switch 25 can be disconnected.

[0157] Alternatively, when the voltage divider contactor 12 is disconnected, if it is needed to manage the high-voltage module 1, the first switch 32, the second switch 24 and the third switch 25 are controlled to be in the closed state, at this time the circuit can be in the on state through the resistance branch 3, so as to realize the insulation monitoring of the high-voltage module 1. If it is not needed to monitor the insulation of the high-voltage module 1, the first switch 32, the second switch 24 and the third switch 25 can be controlled to be in the disconnected state, at this time the circuit is in the disconnected state, avoiding that the resistance branch 3, the first insulation branch 21, the second insulation branch 22 and the insulation monitoring device 23 are always connected to the two ends of the high-voltage module 1, continuously consuming the power of the high-voltage module 1, causing the high-voltage module 1 to be fed.

[0158] It should be noted that the first switch 32, the second switch 24 and the third switch 25 mentioned in the above-mentioned embodiments, when they exist in the high-voltage system of the battery, the corresponding control device thereof can be the insulation monitoring device 23, or the control unit 27 mentioned above, and the present application does not limit this.

[0159] It should be noted that the above-mentioned example shows that a control switch is added to the insulation monitoring circuit, and when the management module 2 also includes other electronic devices, a control switch can also be added in a similar manner to disconnect the connection and reduce the power consumption when management is not needed.

[0160] It should be understood that the switch should be connected with its corresponding control device, so that the control device can control it. The connection here can be direct connection or indirect connection, etc., which can be designed according to actual needs.

[0161] In addition, the above-mentioned switch can be any switch that is turned on or off by control, for example, a contactor, etc.

[0162] In summary, the battery high-voltage system provided by the present application is for a high-voltage module provided with a voltage divider contactor between the series-connected battery units, and uses a resistance branch connected in parallel with the voltage divider contactor to ensure that when the voltage divider contactor is connected again after being disconnected, the resistance branch can reduce the potential difference between the two ends of the voltage divider contactor after being disconnected, so that when the voltage divider contactor is connected again, there will be no excessive electrical shock in the battery high-voltage system, preventing the electronic devices in the battery high-voltage system from being damaged due to excessive electrical shock, and improving the service life of the battery high-voltage system. In addition, the present application only connects a resistance in parallel with the voltage divider contactor, without the need to modify other parts of the circuit, reducing the complexity of circuit design and production.

[0163] In addition, the setting of the resistance branch ensures that the battery high-voltage system provides a backup current path, ensuring that the circuit can still maintain a conducting state when the voltage divider contactor is disconnected, so that the management module can still monitor and / or manage the high-voltage module in the case of disconnection of the voltage divider contactor, effectively improving the safety of the system.

[0164] The present application provides an electric energy device, which comprises a device main body, and the above-mentioned battery high-voltage system. The electric energy device here can be a vehicle, such as a car, a ship, an aircraft, etc., can also be an energy storage cabinet, an energy storage battery, etc., or can be other electric energy devices using high voltage, such as air conditioners, etc., without limitation.

[0165] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application cover any and all variations of the application that come within the scope of the general inventive concepts and including those that fall within the following claims and their equivalents. It is submitted that the specification and examples are exemplary only and that the true scope and spirit of the application are indicated by the following claims.

[0166] It should be understood that the present application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims appended hereto.

Claims

1. A battery high voltage system, characterized by, The battery high-voltage system comprises: a high-voltage module (1), the high-voltage module (1) comprising M battery units (11), a resistance branch (3) and a voltage division contactor (12), M≥2; the voltage division contactor (12) is connected in series between any two adjacent battery units (11), and the resistance branch (3) is connected in parallel with the voltage division contactor (12).

2. The battery high voltage system of claim 1, wherein, The resistance branch (3) comprises: a resistance module (31), the resistance module (31) comprising one resistance; or, the resistance module (31) comprises a plurality of resistances, and the plurality of resistances are connected in series and / or in parallel.

3. The battery high voltage system of claim 2, wherein, The resistance branch (3) further comprises a first switch (32); the first switch (32) is connected in series with the resistance module (31) and is used for controlling the resistance module (31) to be turned on or turned off.

4. The battery high voltage system of claim 1, wherein, The resistance value of the resistance branch (3) is located in a target resistance value interval, the lower limit of the target resistance value interval is greater than or equal to a first resistance value, and the upper limit is less than or equal to a second resistance value; the first resistance value is a resistance value determined based on a voltage platform interval and a safety current of the high-voltage module (1); the second resistance value is a resistance value determined based on the voltage platform interval of the high-voltage module (1), an insulation resistance value range triggering insulation alarm, and a measurement voltage range corresponding to the insulation resistance value range.

5. The battery high voltage system of claim 1, wherein, The resistance value of the resistance branch (3) is located in a target resistance value interval, the lower limit of the target resistance value interval is greater than or equal to a first resistance value, and the upper limit is less than or equal to a second resistance value; the first resistance value is 6KΩ, and the second resistance value is 500MΩ.

6. The battery high voltage system of claim 5, wherein, The second resistance value is 100MΩ.

7. The battery high voltage system of claim 1, wherein, The resistance branch (3) is arranged in the voltage division contactor (12).

8. The battery high voltage system of claim 1, wherein, The resistance branch (3) is arranged on a printed circuit board, and the printed circuit board is connected in parallel with the corresponding voltage division contactor (12).

9. The battery high voltage system of claim 8, wherein, The printed circuit board is a flexible printed circuit board, and the resistance branch (3) is attached to the flexible printed circuit board.

10. The battery high voltage system of claim 1, wherein, The high-voltage module (1) comprises a plurality of resistance branches (3), and each resistance branch (3) corresponds to a voltage division contactor (12) in parallel.

11. The battery high voltage system of any of claims 1-10, wherein, The battery high-voltage system further comprises: a management module (2) connected with the high-voltage module (1) and used for monitoring and / or managing the high-voltage module (1).

12. The battery high voltage system of claim 11, wherein, The management module (2) comprises: a battery information acquisition unit (26) connected in parallel with the battery unit and used for acquiring information of the battery unit.

13. The battery high voltage system of claim 11, wherein, The management module (2) comprises: a control unit (27) used for controlling the charge and discharge state of the high-voltage module (1).

14. The battery high voltage system of claim 11, wherein, The management module (2) comprises: The first insulation branch (21), the second insulation branch (22), and the insulation monitoring device (23); wherein one end of the first insulation branch (21) is connected with the positive pole of the high-voltage module (1), one end of the second insulation branch (22) is connected with the negative pole of the high-voltage module (1), the other end of the first insulation branch (21) and the other end of the second insulation branch (22) are both connected with the insulation monitoring device (23), thereby forming an insulation monitoring loop of the high-voltage module (1); The insulation monitoring device (23) is configured to monitor the insulation of the high-voltage module (1) by the voltage of the first insulation branch (21) and the second insulation branch (22).

15. The battery high voltage system of claim 14, wherein, The management module (2) further comprises: A second switch (24), one end of the second switch (24) is connected with one end of the first insulation branch (21), and the other end of the second switch (24) is connected with the positive pole of the high-voltage module (1); A third switch (25), one end of the third switch (25) is connected with one end of the second insulation branch (22), and the other end of the second switch (24) is connected with the negative pole of the high-voltage module (1); The second switch (24) and the third switch (25) are configured to control whether the insulation monitoring loop is turned on.

16. An electrical energy device, characterized by The electric energy device comprises a device main body and a battery high-voltage system according to any one of claims 1-15.

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