Battery system, power system and vehicle

Abstract

The utility model discloses a battery system, a power system and a vehicle. The battery system comprises a battery pack and a filter capacitor, the battery pack comprises a cooling module and a battery cell group, the filter capacitor is used for being electrically connected between the battery cell group and the motor controller; and the cooling module is used for cooling the battery cell group and the filter capacitor.

Description

Technical Field

[0001] The present application relates to the field of electricity, and more specifically to a battery system, a power system and a vehicle. Background Art

[0002] In the power system of an electric vehicle, the battery pack, motor controller and motor are electrically connected in sequence. The motor controller is used to convert the DC power output by the battery pack into AC power that can drive the motor to rotate, thereby driving the vehicle. In the related art, a filter capacitor is provided at the input end of the motor controller. The filter capacitor is used to absorb the differential mode interference generated by the motor controller to ensure that the input end of the motor controller has a stable, reliable and clean DC bus voltage. However, the filter capacitor in the related art may overheat, thereby reducing the service life of the filter capacitor. Utility Model Content

[0003] The present utility model is proposed to solve at least one of the above problems. According to the first aspect of the present application, a battery system is provided, the battery system comprising: a battery pack and a filter capacitor; wherein the battery pack comprises: a cooling module and a battery cell group; the filter capacitor is used to be electrically connected between the battery cell group and the motor controller; the cooling module is used to cool the battery cell group and the filter capacitor.

[0004] In one embodiment of the present application, the filter capacitor is disposed in the battery pack.

[0005] In one embodiment of the present application, the filter capacitor is at least one non-liquid-filled battery cell.

[0006] In one embodiment of the present application, the battery cell group includes liquid-injected battery cells, and the liquid-injected battery cells and the non-liquid-injected battery cells are arranged in rows.

[0007] In one embodiment of the present application, the battery pack further includes a first interface, wherein the first interface is suitable for electrically connecting to the motor controller; and the filter capacitor is electrically connected between the first interface and the battery cell group.

[0008] In one embodiment of the present application, the battery pack further includes: a main positive contactor and a main negative contactor; wherein the main positive contactor is electrically connected between the positive pole of the battery cell group and the positive pole of the first interface, and the main negative contactor is electrically connected between the negative pole of the battery cell group and the negative pole of the first interface; the first end of the filter capacitor is electrically connected between the main positive contactor and the positive pole of the battery cell group, and the second end of the filter capacitor is electrically connected between the main negative contactor and the negative pole of the battery cell group; or, the first end of the filter capacitor is electrically connected between the main positive contactor and the positive pole of the first interface, and the second end of the filter capacitor is electrically connected between the main negative contactor and the negative pole of the first interface.

[0009] In one embodiment of the present application, the motor controller is disposed in the battery pack; the battery pack also includes a second interface for electrically connecting to the motor, wherein the motor controller is used to control conduction and disconnection between the battery cell group and the second interface.

[0010] In one embodiment of the present application, the first end of the filter capacitor is electrically connected between the positive electrode of the battery cell group and the positive bus of the motor controller; the second end of the filter capacitor is electrically connected between the negative electrode of the battery cell group and the negative bus of the motor controller.

[0011] In one embodiment of the present application, the battery pack further includes at least one third interface, and the third interface is used to electrically connect a preset load; wherein the motor controller is also used to control the conduction and disconnection between the battery cell group and the third interface.

[0012] In one embodiment of the present application, the battery pack further includes: a compressor controller and a fourth interface, wherein the fourth interface is used to electrically connect to the compressor, and the compressor controller is used to control the conduction and disconnection between the battery cell group and the fourth interface; or / and, an on-board charger and a fifth interface, wherein the fifth interface is used to electrically connect to an AC charging port; or / and, a DC converter and a sixth interface, wherein the sixth interface is used to electrically connect to a DC charging port.

[0013] According to the second aspect of the present application, a power system is also provided, which includes: a motor; wherein the motor is used to output torque, the motor is suitable for being electrically connected to the battery pack, and the battery pack is a battery pack in any one of the battery systems described above.

[0014] According to a third aspect of the present application, a vehicle is also provided, comprising: any one of the battery systems described above, or any one of the power systems described above.

[0015] According to the battery system, power system and vehicle provided in the present application, the filter capacitor electrically connected between the battery cell group and the motor controller is cooled by the cooling module in the battery pack, thereby preventing the filter capacitor from overheating and improving the service life of the filter capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a circuit diagram of a battery system according to an embodiment of the present utility model;

[0018] Figure 2 A circuit diagram of a battery system according to another embodiment of the present invention;

[0019] Figure 3 A circuit diagram of a battery system according to another embodiment of the present invention;

[0020] Figure 4 A circuit diagram of a battery system according to another embodiment of the present invention;

[0021] Figure 5 This is a circuit diagram of a battery system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more obvious, the exemplary embodiments according to the utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments of the utility model, and it should be understood that the utility model is not limited to the exemplary embodiments described here. Based on the embodiments of the utility model described in the utility model, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the utility model.

[0023] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0024] It should be understood that the utility model can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

[0025] In order to thoroughly understand the present invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0026] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0027] Faced with energy and environmental pressures, electric vehicles are becoming more and more popular. Unlike traditional fuel vehicles (which use engines to burn oil to drive vehicles), electric vehicles use motor controllers to convert the DC power output from power batteries into AC power that can drive motors to rotate, thereby driving the vehicle. Therefore, the drive motor and its control system are the main executive structure in the driving of electric vehicles. The drive motor and its control system are one of the core components of electric vehicles (batteries, motors, and electronic controls). Their driving characteristics determine the main performance indicators of the vehicle's driving. They are important components of electric vehicles and must be able to operate reliably and stably throughout the entire life cycle of the electric vehicle.

[0028] In the circuit topology of the related technical solution, there is an X capacitor with a filtering function in the motor drive circuit of the electric vehicle, which is installed at both ends of the motor controller input line to eliminate differential mode interference. The X capacitor has a filtering function and can absorb the high-frequency switching frequency and current ripple generated by the motor controller to ensure that the motor controller input has a stable, reliable and clean DC bus voltage, and can also be used to protect power devices. Therefore, the X capacitor plays a vital role in the safety and stability of the entire motor controller.

[0029] In the related art, in the motor controller of the electric vehicle technical solution, the X capacitor generally adopts a metallized film capacitor, which uses a metal with a very small film thickness to realize the capacitor function. The metallized film capacitor is a capacitor made by winding an organic plastic film as a dielectric and a metallized film as an electrode. It has no electrolyte inside and is characterized by large capacity, high withstand voltage, low noise, and low ESR (Equivalent Series Resistance). Although its ESR is small, the effective value Ipha of the phase current in electric vehicles is large, and the rated value can reach about several hundred Arms. Then the current ripple Icap on the X capacitor can reach nearly 100 Arms, which is likely to reduce the life of the X capacitor and even risk damaging the X capacitor. In addition, due to the complex process of the X capacitor, the size of the metallized film capacitor is difficult to reduce, and the ability to withstand large currents is poor.

[0030] In addition, the X capacitor in the motor controller of the electric vehicle may also overheat. When the X capacitor overheats, its interior is heated violently, causing the capacitance value and withstand voltage of the X capacitor to decrease due to severe heat generation, and the bus ripple voltage to increase, which is likely to reduce the service life of the X capacitor and even risk damaging the X capacitor. There is also a risk of damaging the IGBT in the motor controller. At this time, the motor controller does not operate normally and cannot guarantee the driver's safe driving. In addition, if an emergency occurs, such as a huge fire source or a fire nearby, the internal temperature of the X capacitor is too high. At this time, the motor controller cannot implement over-temperature protection, which is likely to cause serious consequences. Furthermore, the X capacitor in the motor controller of the electric vehicle can be used as an energy storage element to store energy. When the external power supply is disconnected, the energy stored in the X capacitor needs to be discharged. At this time, the X capacitor may also be charged, causing the outer shell of the motor controller to be charged, affecting the safety of the electric vehicle.

[0031] The above-mentioned technical problems existing in the related technologies can be solved by the technical solutions shown in some embodiments of the present application.

[0032] The present application embodiment provides a battery system, referring to Figure 1 The battery system includes: a battery pack and a filter capacitor (such as Figure 1 to Figure 4 C in the figure represents a filter capacitor); wherein the battery pack includes: a cooling module (not shown in the figure), and a battery cell group; the filter capacitor is used to be electrically connected between the battery cell group and the motor controller; the cooling module is used to cool the battery cell group and the filter capacitor.

[0033] In the above scheme, the cooling module in the battery pack cools the filter capacitor electrically connected between the battery cell group and the motor controller, thereby preventing the filter capacitor from overheating and improving the service life of the filter capacitor. The above structures are described in detail below in conjunction with the accompanying drawings.

[0034] When setting up a battery pack, any battery device that can output electrical energy can be used. Specifically, the battery pack may include: a cooling module, and a battery cell group. The cooling module is used to cool the battery cell group to prevent the battery cell group from overheating during the charging and discharging process. Exemplarily, the cooling module may adopt various cooling modules such as but not limited to direct cooling plates, air coolers, liquid coolers, etc. The battery pack can be used to store and output electrical energy. Exemplarily, the battery pack can be a power battery for a vehicle, providing driving power for the vehicle. Exemplarily, the battery cell group in the battery pack is composed of liquid-filled batteries. Reference Figure 1 , Figure 2 and Figure 5, wherein the battery cell group includes at least one liquid-injected battery cell, and specifically, the battery cell group may include multiple liquid-injected battery cells. Multiple liquid-injected battery cells may be connected in parallel or in series to form an energy storage device capable of outputting a preset voltage and a preset current. For example, reference Figure 4 , a voltage-dividing contactor can be provided in the battery pack, and the voltage-dividing contactor can cut off the circuit when there is a high-voltage risk inside the battery pack. Of course, the voltage-dividing contactor can also be omitted in the battery pack. It should be explained that a liquid-injected battery cell refers to a battery cell that has been injected with electrolyte, so that the battery cell can store energy normally, that is, the liquid-injected battery cell can be charged and discharged normally.

[0035] Exemplary, reference Figure 1 to Figure 5 , the battery pack may include a box body, such as Figure 1 to Figure 5 The battery pack box body in the figure represents the box body of the battery pack. The battery cell group and the cooling module are arranged in the box body. Exemplarily, a battery cell cavity may be arranged in the box body, and the battery cell group is arranged in the battery cell cavity. The cooling module is thermally connected to the battery cell group, so that the battery cell group can be cooled.

[0036] refer to Figure 1 The battery system also includes a filter capacitor. The filter capacitor is used to electrically connect between the battery pack and the motor controller. Figure 1 The motor controller is used to electrically connect the motor to control the direct current when the battery pack is discharged, and then convert it into a current that can be input into the motor after rectification, voltage adjustment and other operations. Exemplarily, the motor can be a drive motor. Exemplarily, the motor can be a three-phase AC motor or a single-phase AC motor. At this time, the motor controller is used to convert the direct current output by the battery pack into alternating current that can drive the motor to rotate, thereby driving the vehicle. Exemplarily, when the battery system is applied to a vehicle, the motor controller can be a motor controller on the vehicle.

[0037] refer to Figure 1 , where the filter capacitor is electrically connected between the battery pack and the motor controller. The filter capacitor has a filtering effect and can absorb the high-frequency switching frequency and current ripple generated by the motor controller to ensure that the motor controller input has a stable, reliable and clean DC bus voltage. The filter capacitor can also be used to protect power devices. That is, the filter capacitor can ensure the safety and stability of the entire motor controller.

[0038] In the embodiment of the present application, the cooling module in the battery pack is not only used to cool the battery cell group, but also used to cool the filter capacitor, so that the cooling module in the battery pack can be used to cool the filter capacitor, thereby preventing the filter capacitor from overheating, thereby preventing the filter capacitor from causing the capacitance value and the withstand voltage to decrease due to severe heating, increasing the bus ripple voltage, improving the service life of the filter capacitor, and preventing damage caused by overheating of the filter capacitor. Thus, the filter capacitor can better protect the IGBT in the motor controller and prevent the IGBT in the motor controller from being damaged due to overheating of the filter capacitor. Thus, it is ensured that the motor controller can work reliably and stably, and the safe driving of the vehicle is ensured. In addition, if an emergency occurs, such as a huge fire source or a fire occurs nearby, the filter capacitor can be cooled by the cooling module in the battery pack, so that the filter capacitor can be protected from overheating to prevent serious consequences. Furthermore, the filter capacitor in the motor controller of the electric vehicle can be used as an energy storage element to store energy. When the external power supply is disconnected, the energy stored in the filter capacitor can be discharged through the discharge path inside the battery pack, so that the shell of the motor controller is not charged and the safety of the motor controller is not affected.

[0039] Exemplary, reference Figure 1 , the filter capacitor can be set in the battery pack. By setting the filter capacitor in the battery pack, the cooling module in the battery pack can be used to cool the filter capacitor, thereby preventing the filter capacitor from overheating, thereby preventing the filter capacitor from causing the capacitance value and voltage resistance to decrease due to severe heating, increasing the bus ripple voltage, and improving the service life of the filter capacitor, and preventing damage caused by overheating of the filter capacitor. As a result, the filter capacitor can better protect the IGBT in the motor controller and prevent damage to the IGBT in the motor controller due to overheating of the filter capacitor. This ensures that the motor controller can work reliably and stably, and ensures safe driving of the vehicle.

[0040] In addition, if an emergency occurs, such as a huge fire source or fire nearby, the cooling module in the battery pack can be used to cool the filter capacitor, thereby implementing over-temperature protection for the filter capacitor to prevent serious consequences. Furthermore, the filter capacitor in the motor controller of an electric vehicle can be used as an energy storage element to store energy. When the external power supply is disconnected, the energy stored in the filter capacitor can be discharged through the discharge path inside the battery pack, so that the shell of the motor controller is not charged and does not affect the safety of the motor controller.

[0041] Of course, it should be noted that the filter capacitor can be set at any position that can be cooled by the cooling module in the battery pack, and is not limited to being set inside the battery pack. For example, the filter capacitor can also be set outside the battery pack, and the cooling module is still thermally connected to the filter capacitor, so that the cooling module can still cool the filter capacitor.

[0042] There are many ways to set the filter capacitor. The following are some examples of how to set it.

[0043] Exemplarily, the filter capacitor is at least one non-liquid-filled battery cell. Exemplarily, refer to Figure 5 , the filter capacitor is composed of at least one unfilled battery cell. It should be explained that an unfilled battery cell refers to a battery cell that has not been injected with electrolyte. At this time, the battery cell cannot store energy normally, that is, the battery cell at this time cannot be charged and discharged normally. Exemplarily, the filter capacitor can be composed of one, two, three or more unfilled battery cells. When the filter capacitor is composed of one unfilled battery cell, a single unfilled battery cell is a filter capacitor. When the filter capacitor is composed of two or more unfilled battery cells, two or more unfilled battery cells can be connected in parallel, in series, or other ways to form a filter capacitor.

[0044] Exemplarily, when the cell group includes liquid-injected cells, the liquid-injected cells and the non-liquid-injected cells can be arranged in rows. Specifically, the liquid-injected cells in the cell group and the non-liquid-injected cells used as filter capacitors can be arranged in rows to form at least one cell row. Exemplarily, the liquid-injected cells in the cell group and the non-liquid-injected cells in the filter capacitor form at least one cell row. Exemplarily, the shell of the non-liquid-injected cells can be the same or substantially the same as the shell of the liquid-injected cells in terms of external dimensions, so that some of the cell units in the cell row can be selected to be used as non-liquid-injected cells in the filter capacitor without injecting electrolyte. Exemplarily, since the liquid-injected cells and the non-liquid-injected cells in the cell group have the same or substantially the same external dimensions, they can be arranged to form one, two or more cell rows, and then the cell rows are set in the cell cavity of the battery pack. The arrangement of each cell row can be arranged in sequence along the thickness direction of the liquid-injected cells and the non-liquid-injected cells, so as to be arranged into cell rows.

[0045] Exemplarily, the cells in the cell row can use blade cells. That is, the cells in the cell row are long thin strips similar to blades in appearance. The liquid-injected cells in the cell group mainly include positive electrodes, negative electrodes, diaphragms and electrolytes, which convert the stored energy into electrical energy through chemical reactions. The positive and negative electrodes of the blade chip are both made of a very thin metal sheet. The electrolyte is an important component of the liquid-injected cell and is a carrier for ion transmission in the cell. It plays the role of conducting ions between the positive and negative electrodes of the cell, so that a charge balance is formed between the positive and negative electrodes, thereby enabling it to generate electricity.

[0046] The capacitance value of the battery cell that is not injected with electrolyte (non-liquid-injected battery cell) can reach the microfarad level. In this embodiment, the non-liquid-injected battery cell in the filter capacitor is connected in parallel between the positive and negative electrodes of the battery cell group, which can replace the X capacitor on the load side to eliminate differential mode interference. The non-liquid-injected battery cell used in the filter capacitor has a filtering effect, which can filter the high-frequency switching frequency and current ripple generated by the motor controller to ensure that the motor controller input has a stable, reliable and clean DC bus voltage, improve the safety, stability and reliability of the operation of the entire motor controller, and protect the power device.

[0047] The feature of this embodiment is that one or more non-liquid-injected cells (cells without electrolyte injection) are used as filter capacitors, and the filter capacitors are connected in parallel at the positive and negative ends of the battery pack, and integrated with the cell group inside the battery pack. The cell group composed of liquid-injected cells (cells injected with electrolyte) can meet the application requirements of electric vehicles, and can be used as filter capacitors to play a filtering role, filter high-frequency switching frequencies and current ripples, to ensure the stability and reliability of the DC bus voltage at the input end of the motor controller, and protect power devices. That is, without affecting the basic functions of the module, the integration of the filter capacitor and the cell group in the battery pack is realized.

[0048] Exemplary, reference Figure 1 and Figure 2 , the motor controller can be arranged outside the battery pack, in which case the battery pack further comprises a first interface, and the first interface is suitable for electrically connecting the motor controller. In this case, the filter capacitor is electrically connected between the first interface and the battery cell group. Regarding the type of the first interface, a port device capable of electrically connecting, such as but not limited to a plug interface, a pad, etc., can be used as the first interface.

[0049] Exemplary, reference Figure 1 and Figure 2 When the motor controller is arranged outside the battery pack, the battery pack may further include: a main positive contactor and a main negative contactor. The main positive contactor is electrically connected between the positive pole of the battery cell group and the positive pole of the first interface, and the main negative contactor is electrically connected between the negative pole of the battery cell group and the negative pole of the first interface. Since the motor controller is arranged outside the battery pack, the main positive contactor and the main negative contactor may be arranged to control whether the battery cell group discharges the motor controller, thereby improving safety.

[0050] Exemplary, reference Figure 4 When a main positive contactor and a main negative contactor are provided in the battery pack, a voltage-dividing contactor may be provided in the battery cell group. The advantage of the voltage-dividing contactor over the main positive contactor and the main negative contactor is that the voltage-dividing contactor can cut off the circuit when there is a high-voltage risk inside the battery pack.

[0051] Exemplarily, when a main positive contactor and a main negative contactor are provided in the battery pack, refer to Figure 1, the first end of the filter capacitor can be electrically connected between the main positive contactor and the positive electrode of the battery cell group, and the second end of the filter capacitor can be electrically connected between the main negative contactor and the negative electrode of the battery cell group. That is, the filter capacitor is arranged between the battery cell group and the main positive contactor and the main negative contactor. Therefore, when the main positive contactor and the main negative contactor are turned off, the filter capacitor can still be used for filtering the battery cell group.

[0052] Exemplarily, when a main positive contactor and a main negative contactor are provided in the battery pack, refer to Figure 2 , the first end of the filter capacitor is electrically connected between the main positive contactor and the positive electrode of the first interface, and the second end of the filter capacitor is electrically connected between the main negative contactor and the negative electrode of the first interface. That is, the filter capacitor is arranged between the first interface and the main positive contactor and the main negative contactor. Therefore, when the main positive contactor and the main negative contactor are turned off, the filter capacitor is also disconnected from the electrical connection of the battery cell group.

[0053] For example, Figure 1 and Figure 2 The topological diagram of the high-voltage system structure of some embodiments is shown, and the scheme structure includes a battery cell group, a motor controller and a motor of a battery pack. In addition, the battery pack shown in the figure contains a main positive contactor, a main negative contactor, a battery cell group for providing electric energy, and an unfilled battery cell (not injected with electrolyte) for replacing the load-side X capacitor. The motor controller includes six IGBT power devices, and its working principle as a core component is: by adjusting the conduction and shutdown of the IGBT, the form of output electric energy is adjusted to drive the motor and then drive the vehicle. In this embodiment, a single unfilled battery cell (battery cell without electrolyte) is used to replace the load-side X capacitor and integrated into the battery pack. The connection harness and copper busbar between the metallized film capacitor and other components in the original drive assembly can be omitted, saving space while reducing costs. Because the battery cell structure of the filter capacitor is consistent with the liquid-filled battery cell of the battery cell group and is compatible with each other, it is easier to arrange, further improving safety.

[0054] Exemplary, reference Figure 3 , Figure 4 and Figure 5 , the motor controller can also be set in the battery pack to improve the integration of the electric control system and the battery pack. Figure 3 , Figure 4 and Figure 5, the battery pack may also include a second interface for electrically connecting the motor, wherein the motor controller is used to control the conduction and disconnection between the battery cell group and the second interface. The motor controller supplies power to the motor electrically connected to the second interface through the second interface. At this time, the motor controller can control the conduction between the battery cell group and the second interface, so that the battery cell group discharges the battery cell group through the motor controller and the second interface in turn. There is no need to set a main positive contactor and a main negative contactor between the motor controller and the battery cell group, reducing the number of contactors and reducing costs. Regarding the type of the second interface, a port device that can be electrically connected, such as but not limited to a plug interface, a pad, etc., can be used as the second interface. Exemplarily, a power distribution cavity may also be provided in the box body of the battery pack, and the motor controller may be provided in the power distribution cavity. Exemplarily, the second interface may be provided on the panel of the power distribution cavity, so as to facilitate the electrical connection between the second interface and the motor controller, and also facilitate the electrical connection between the second interface and the motor outside the battery pack.

[0055] Exemplarily, when the motor controller is disposed in the battery pack, reference Figure 3 , Figure 4 and Figure 5 , the first end of the filter capacitor can be electrically connected between the positive electrode of the battery cell group and the positive bus of the motor controller, and the second end of the filter capacitor can be electrically connected between the negative electrode of the battery cell group and the negative bus of the motor controller. Since there is no need to set a main positive contactor and a main negative contactor, the first end of the filter capacitor can be electrically connected to any node between the positive bus of the motor controller and the positive electrode of the battery cell group, and the second end of the filter capacitor can be electrically connected to any node between the negative bus of the motor controller and the negative electrode of the battery cell group, which simplifies the cost of the filter capacitor.

[0056] Exemplary, reference Figure 3 and Figure 4, the battery pack may also include at least one third interface, which is used to electrically connect a preset load. Among them, the motor controller is also used to control the conduction and shutdown between the battery pack and the third interface. That is, at least one third interface can also be set in the battery pack, and the third interface and the battery pack are also electrically connected through the motor controller, so that the conduction and shutdown between the battery pack and the third interface can also be controlled by the motor controller, so as to control the battery pack to supply power or stop supplying power to the preset load electrically connected to the third interface. Regarding the type of the third interface, a port device that can be electrically connected, such as but not limited to a plug interface, a pad, etc., can be used as the third interface. Exemplarily, the above-mentioned preset load can be other high-voltage loads other than the motor. The high-voltage load refers to a load whose voltage of direct current is greater than 60V and less than or equal to 1500V, or a load whose voltage effective value of alternating current is greater than 30V and less than or equal to 1000V. Exemplarily, the third interface can be set on the panel of the power distribution cavity, so as to facilitate the electrical connection of the third interface and the motor controller, and also facilitate the electrical connection between the third interface and other loads outside the battery pack.

[0057] For example, Figure 3 and Figure 4 In one embodiment, the circuit topology diagram of the battery pack of the battery cell group and the electronic control integration solution is shown. The motor controller can directly control the input and output of the battery cell group by controlling the switch closure of the IGBT power devices V1-V6 of the inverter circuit located in the battery pack box. In this way, the main positive contactor and the main negative contactor of the battery pack can be reduced. For example, when the IGBT power devices V1, V3 and V5 are turned off, the high-voltage system is in a disconnected state, and the high-voltage system stops working. When the IGBT power device is normally switched on and off according to the control signal, the battery cell group can discharge normally to the outside, and the motor and other high-voltage components are in operation. In this solution, the IGBT power device replaces the role of the contactor to control the working state of the motor and high-voltage components. The IGBT power device of the reused motor controller also realizes the function of the contactor and can reduce space and cost. In addition, the single-cell non-liquid-injected battery cell (battery cell without electrolyte) used in this embodiment replaces the traditional metallized film capacitor (X capacitor) solution and is applied to the battery pack and electronic control integration solution. Since the integrated solution has integrated the battery cell group and the motor controller into one box body, the non-liquid-injected battery cell (battery cell without electrolyte) with the same battery cell structure (battery cell with liquid injection) as the load-side X capacitor can improve the compatibility between high-voltage components and make it easier to arrange the internal space of the battery pack box body.

[0058] Exemplary, reference Figure 5, the battery pack may also include: a compressor controller and a fourth interface, wherein the fourth interface is used to electrically connect the compressor, and the compressor controller is used to control the conduction and shutdown between the battery cell group and the fourth interface. The compressor controller is electrically connected to the battery cell group, and the fourth interface is electrically connected to the compressor controller. That is, in this embodiment, the compressor controller can also be integrated into the battery pack, and a fourth interface is provided on the battery pack to realize the electrical connection between the compressor controller and the compressor. And since the compressor controller is integrated in the battery pack, the electrical connection between the compressor controller and the battery cell group can be simplified. Regarding the type of the fourth interface, a port device that can be electrically connected, such as but not limited to a plug interface, a solder pad, etc., can be used as the fourth interface. Exemplarily, a power distribution cavity can also be provided in the box body of the battery pack, and the compressor controller can be provided in the power distribution cavity. Exemplarily, the fourth interface can be provided on the panel of the power distribution cavity, so as to facilitate the electrical connection between the fourth interface and the compressor controller, and also facilitate the electrical connection between the fourth interface and the compressor outside the battery pack.

[0059] Exemplary, reference Figure 5 , the battery pack may further include: an on-board charger (OBC) and a fifth interface, wherein the fifth interface is used to electrically connect to the AC charging port. The on-board charger is electrically connected to the battery cell group, and the fifth interface is electrically connected to the on-board charger. That is, in this embodiment, the on-board charger may also be integrated into the battery pack, and a fifth interface may be provided on the battery pack to realize the electrical connection between the on-board charger and the AC charging port. And since the on-board charger is integrated in the battery pack, the electrical connection between the on-board charger and the battery cell group can be simplified. Regarding the type of the fifth interface, a port device that can be electrically connected, such as but not limited to a plug interface, a pad, etc., may be used as the fifth interface. Exemplarily, a power distribution cavity may also be provided in the box body of the battery pack, and the on-board charger may be provided in the power distribution cavity. Exemplarily, the fifth interface may be provided on the panel of the power distribution cavity, so as to facilitate the electrical connection between the fifth interface and the on-board charger, and also facilitate the electrical connection between the fifth interface and the on-board charger outside the battery pack.

[0060] Exemplary, reference Figure 5, the battery pack may further include: a direct current converter (DC) and a sixth interface, wherein the sixth interface is used to electrically connect to the DC charging port. The DC converter is electrically connected to the battery cell group, and the sixth interface is electrically connected to the DC converter. That is, in this embodiment, the DC converter may also be integrated into the battery pack, and a sixth interface may be provided on the battery pack to realize the electrical connection between the on-board charger and the DC charging port. And since the DC converter is integrated in the battery pack, the electrical connection between the DC converter and the battery cell group can be simplified. Regarding the type of the sixth interface, a port device that can be electrically connected, such as but not limited to a plug interface, a pad, etc., may be used as the sixth interface. Exemplarily, a power distribution cavity may also be provided in the box body of the battery pack, and the DC converter may be provided in the power distribution cavity. Exemplarily, the sixth interface may be provided on the panel of the power distribution cavity, so as to facilitate the electrical connection between the sixth interface and the DC converter, and also facilitate the electrical connection between the sixth interface and the DC converter outside the battery pack.

[0061] For example, Figure 5 This is a structural topology diagram of the battery cell group and electronic control integration solution in a battery system of an embodiment. The battery pack includes a battery pack box consisting of a battery cell group and controllers of various high-voltage components, as well as other high-voltage components outside the box (such as an AC charging port, a DC charging port, a compressor, and a motor). The battery pack box includes a battery cell group formed by multiple liquid-filled cells connected in series, a single non-liquid-filled cell (without electrolyte) used to replace the load-side X capacitor, an OBC (on-board charger) / DC (direct current converter), a motor controller, and a compressor controller. This integrated solution integrates the controller of the high-voltage components of the automobile high-voltage system with the battery cell group in one box. The battery cell group realizes its original function by reusing the circuit of the motor controller and adjusting the control algorithm, and finally realizes the maximum integration of the battery pack's electronic control system without affecting the basic functions of each module in the system.

[0062] In the various embodiments shown above, the cooling module in the battery pack is used to cool the filter capacitor electrically connected between the battery cell group and the motor controller, thereby preventing the filter capacitor from overheating and increasing the service life of the filter capacitor.

[0063] In some of the above embodiments, a filter capacitor electrically connected between the battery cell group and the motor controller is disposed in a battery pack, and a cooling module in the battery pack cools the filter capacitor, thereby preventing the filter capacitor from overheating and improving the service life of the filter capacitor.

[0064] In some of the above embodiments, considering the safety, cost, and space issues of the core components of the high-voltage system of electric vehicles, the beneficial effects compared with the related art are:

[0065] 1. Related Technology The X capacitor on the load side is a metallized film capacitor, which is installed at both ends of the motor controller input line, that is, installed inside the drive assembly. Since the metallized film capacitor is large in size, it will occupy a part of the assembly space. In some embodiments of the present application, the non-liquid-filled battery cell (battery cell without electrolyte injection) is used as a filter capacitor on the load side, integrated into the battery pack, and replaces the X capacitor on the load side, which can save space inside the drive assembly. Because the filter capacitor uses a battery cell structure, it is consistent with the liquid-filled battery cell in the battery cell group, compatible with each other, and is also installed inside the battery pack, it is easier to arrange the internal space of the battery pack.

[0066] 2. The metallized film capacitor used in the related art may overheat. When the X capacitor overheats, its interior is heated violently, which may damage the X capacitor and the IGBT in the motor controller, posing a safety hazard. In some embodiments of the present application, an unfilled cell (a cell without electrolyte) is installed inside the battery pack, and the battery pack contains a cooling module. The cooling module can cool the filter capacitor, reduce the risk of overheating, and improve the safety and reliability of the high-voltage system operation.

[0067] 3. In the related art, the X capacitor in the motor controller is used as an energy storage element. When the external power supply is disconnected, the energy stored in it needs to be discharged, and the X capacitor may also be charged. In some embodiments of the present application, the X capacitor on the load side is eliminated to improve electrical safety.

[0068] 4. Canceling the X capacitor on the load side can reduce the use of connecting wire harnesses and copper bars between the internal capacitors of the drive assembly and other components, saving space and further reducing costs.

[0069] Furthermore, the present application embodiment also provides a power system, referring to Figure 1 to Figure 5 The power system includes: a motor; wherein the motor is used to output torque, and the motor is suitable for electrically connecting to a battery pack, and the battery pack is a battery pack in any of the above-mentioned battery systems.

[0070] Exemplarily, the power system may be a power system of a vehicle, wherein the motor is used to output torque to the driving wheels of the vehicle, and the motor is electrically connected to the battery pack. Exemplarily, the motor may be a drive motor.

[0071] Furthermore, the present application also provides a vehicle, referring to Figure 1 to Figure 5, the vehicle includes: any one of the above-mentioned battery systems, or, any one of the above-mentioned power systems. Exemplarily, the vehicle can be any vehicle including a battery pack and a motor controller, such as but not limited to an electric vehicle, a hybrid vehicle, etc. Exemplarily, the vehicle is a two-wheel drive vehicle or a four-wheel drive vehicle, that is, the vehicle has two drive wheels or four drive wheels. Exemplarily, the vehicle can be a single-motor, two-motor, three-motor or four-motor vehicle. The above-mentioned battery pack can be a power battery of the vehicle.

[0072] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A battery system, characterized in that: include: A battery pack, comprising: a cooling module and a battery cell group; and A filter capacitor, used for electrically connecting between the battery pack and the motor controller; Wherein, the cooling module is used to cool the battery cell group and the filter capacitor.

2. The battery system according to claim 1, characterized in that: The filter capacitor is arranged in the battery pack.

3. The battery system according to claim 1, characterized in that: The filter capacitor is at least one non-liquid-filled battery cell.

4. The battery system according to claim 3, characterized in that: The battery cell group includes liquid-injected battery cells, and the liquid-injected battery cells and the non-liquid-injected battery cells are arranged in rows.

5. The battery system according to any one of claims 1 to 4, characterized in that: The battery pack further comprises a first interface, wherein the first interface is adapted to be electrically connected to the motor controller; The filter capacitor is electrically connected between the first interface and the battery cell group.

6. The battery system according to claim 5, characterized in that: The battery pack further comprises: a main positive contactor and a main negative contactor; wherein the main positive contactor is electrically connected between the positive electrode of the battery cell group and the positive electrode of the first interface, and the main negative contactor is electrically connected between the negative electrode of the battery cell group and the negative electrode of the first interface; The first end of the filter capacitor is electrically connected between the main positive contactor and the positive electrode of the battery cell group, and the second end of the filter capacitor is electrically connected between the main negative contactor and the negative electrode of the battery cell group; or, The first end of the filter capacitor is electrically connected between the main positive contactor and the positive electrode of the first interface, and the second end of the filter capacitor is electrically connected between the main negative contactor and the negative electrode of the first interface.

7. The battery system according to any one of claims 1 to 4, characterized in that: The motor controller is disposed in the battery pack; The battery pack also includes a second interface for electrically connecting to a motor, wherein the motor controller is used to control the conduction and disconnection between the battery cell group and the second interface.

8. The battery system according to claim 7, characterized in that: The first end of the filter capacitor is electrically connected between the positive electrode of the battery cell group and the positive bus of the motor controller; The second end of the filter capacitor is electrically connected between the negative electrode of the battery cell group and the negative bus of the motor controller.

9. The battery system according to claim 7, characterized in that: The battery pack further comprises at least one third interface, wherein the third interface is used to electrically connect a preset load; Wherein, the motor controller is also used to control the conduction and disconnection between the battery cell group and the third interface.

10. The battery system according to any one of claims 1 to 4, characterized in that: The battery pack further comprises: A compressor controller and a fourth interface, wherein the fourth interface is used to electrically connect to a compressor, and the compressor controller is used to control the conduction and disconnection between the battery cell group and the fourth interface; or / and, An on-board charger and a fifth interface, wherein the fifth interface is used to electrically connect to an AC charging port; or / and, A DC converter and a sixth interface, wherein the sixth interface is used to electrically connect to a DC charging port.

11. A power system, characterized in that: include: A motor for outputting torque; The motor is suitable for being electrically connected to the battery pack, and the battery pack is the battery pack in the battery system according to any one of claims 1 to 10.

12. A vehicle, characterized in that: include: The battery system according to any one of claims 1 to 10, or the power system according to claim 11.

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