Battery stack structure assembly and pressure reduction method of battery stack structure assembly

Abstract

The present invention provides a battery stack structure assembly and a method for reducing the voltage of the battery stack structure assembly, wherein the battery stack structure assembly includes: a battery stack module and a DC-DC control module, wherein the battery stack module and the DC-DC control module are connected, wherein the battery stack module provides voltage to the DC-DC control module, wherein the working modes of the DC-DC control module include a first working mode and a second working mode, wherein in the first working mode, the DC-DC control module can control the battery stack module to increase the voltage, and in the second working mode, the DC-DC control module can control the battery stack module to reduce the voltage, and the first working mode and the second working mode are switchable. The battery stack structure assembly described in the present invention has a low space occupancy rate, and the purpose of reducing the voltage can be achieved through the DC-DC control module.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell stack structure assembly and a pressure reduction method for the fuel cell stack structure assembly. Background Art

[0002] During the startup of the fuel cell, in order to prevent the open circuit voltage from damaging the stack, it is necessary to reduce the stack voltage; similarly, during the shutdown process, in order to prevent the open circuit voltage from damaging the stack and to quickly reduce the voltage, it is also necessary to reduce the stack voltage. The voltage reduction method in the prior art uses an access resistor component, but this will result in a complex layout of components and occupy more space. Therefore, there is room for improvement in the above technology. Summary of the invention

[0003] In view of this, the present invention aims to propose a battery stack structure assembly with low space occupancy and the purpose of voltage reduction can be achieved through a DC-DC control module.

[0004] A second aspect of the present invention provides a method for reducing the pressure of a fuel cell stack structure assembly.

[0005] A third aspect of the present invention provides a fuel cell for a vehicle.

[0006] A fourth aspect of the present invention provides a non-transitory readable storage medium.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0008] The battery stack structure assembly according to the first aspect of the present invention includes: a battery stack module and a DC-DC control module, the battery stack module and the DC-DC control module are connected, the battery stack module provides voltage to the DC-DC control module, the working mode of the DC-DC control module includes a first working mode and a second working mode, in the first working mode, the DC-DC control module can control the battery stack module to boost the voltage, in the second working mode, the DC-DC control module can control the battery stack module to reduce the voltage, and the first working mode and the second working mode are switchable.

[0009] According to the battery stack structure assembly of an embodiment of the present invention, the DC-DC control module includes:

[0010] An input end, through which the voltage of the battery stack module is connected to the DC-DC control module, the input end includes an input capacitor, and the input capacitor can eliminate input ripple voltage;

[0011] A plurality of voltage processing units, each of which comprises a control switch, and in the second working mode, current is passed through the control switch through a current closed loop control to consume energy and reduce the voltage of the battery stack module;

[0012] An output end, the output end is connected to a battery module, and in the second working mode, a voltage of the output end is not greater than a voltage of the battery module.

[0013] According to the battery stack structure assembly of an embodiment of the present invention, the voltage processing unit also includes: an inductor, a diode, an IGBT and an output capacitor. The inductor can store energy, the diode can ensure the unidirectional flow of current, the IGBT can adjust the output voltage, and the output capacitor can eliminate the output ripple voltage.

[0014] According to an embodiment of the present invention, the stack structure assembly further includes: a cooling device, which is connected to the DC-DC control module to cool the DC-DC control module, and a temperature sensor is provided on the cooling device, and the temperature sensor can monitor the cooling water temperature of the DC-DC control module.

[0015] According to the battery stack structure assembly of an embodiment of the present invention, in the second working mode, the operating power of the DC-DC control module is not greater than one percent of the rated power; and the operating current of the DC-DC control module is controlled by current closed-loop to be not greater than one tenth of the rated current.

[0016] According to the fuel cell stack structure assembly of the embodiment of the present invention, the first working mode is a normal working mode, and the second working mode is a power consumption mode.

[0017] Compared with the prior art, the battery stack structure assembly described in the first aspect of the present invention has a low space occupancy rate and can achieve the purpose of voltage reduction through a DC-DC control module.

[0018] According to the voltage reduction method of the battery stack structure assembly according to the second aspect of the present invention, the voltage reduction method can be applied to the battery stack structure assembly according to the first aspect of the present invention. When the battery stack structure assembly is started, the voltage reduction method comprises the following steps:

[0019] S101, when the battery stack structure assembly is started, the DC-DC control module monitors the voltage of the battery stack structure assembly in real time;

[0020] S102, when the voltage of the battery stack structure assembly reaches a specified voltage, the DC-DC control module operates in the second operating mode;

[0021] S103, the DC-DC control module monitors the current of the control switch in real time, and performs current closed-loop control on the control switch to limit the current of the control switch to not exceed a specified current;

[0022] S104, the DC-DC control module monitors the voltage of the output end in real time to limit the voltage of the output end to be no greater than the voltage of the battery module;

[0023] S105, the cooling device monitors the cooling water temperature of the DC-DC control module in real time to limit the cooling water temperature of the DC-DC control module to not be greater than a safe temperature;

[0024] S106, when the voltage of the battery stack module is stable, that is, when the voltage of the input end is stable, the working mode of the DC-DC control module is switched from the second working mode to the first working mode.

[0025] According to the depressurization method of the battery stack structure assembly according to the second aspect of the present invention, the depressurization method can be applied to the battery stack structure assembly according to the first aspect of the present invention. When the battery stack structure assembly is shut down, the depressurization method comprises the following steps:

[0026] S201, when the battery stack structure assembly is shut down, the DC-DC control module is in the first working mode;

[0027] S202, when the voltage of the battery stack module needs to be reduced, the working mode of the DC-DC control module is switched from the first working mode to the second working mode;

[0028] S203, the DC-DC control module monitors the current of the control switch in real time, and performs current closed-loop control on the control switch to limit the current of the control switch to not exceed a specified current;

[0029] S204, the DC-DC control module monitors the voltage of the output end in real time to limit the voltage of the output end to be no greater than the voltage of the battery module;

[0030] S205, the cooling device monitors the cooling water temperature of the DC-DC control module in real time to limit the cooling water temperature of the DC-DC control module to not be greater than a safe temperature;

[0031] S206, when the voltage of the battery stack module reaches a specified voltage, shut down the DC-DC control module to complete the shutdown of the battery stack structure assembly.

[0032] According to the method for reducing the pressure of a battery stack structure assembly described in the second aspect of the present invention, the pressure reduction effect of the battery stack structure assembly is better and the customer satisfaction is higher.

[0033] A fuel cell for a vehicle according to a third aspect of the present invention comprises:

[0034] The battery stack structure assembly described in the first aspect of the present invention;

[0035] A battery box, in which the battery stack structure assembly is encapsulated.

[0036] According to the fuel cell for a vehicle described in the third aspect of the present invention, the stack structure assembly has a better pressure reduction effect and higher customer satisfaction.

[0037] According to the non-temporary readable storage medium of the fourth aspect of the present invention, a computer program is stored thereon, and when the computer program is executed by a processor, the method for reducing the pressure of the battery stack structure assembly as described in the second aspect of the present invention is implemented.

[0038] According to the non-temporary readable storage medium of the fourth aspect of the present invention, the voltage reduction effect of controlling the battery stack structure assembly is better and customer satisfaction is higher.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0041] Figure 1 It is a structural schematic diagram of a battery stack structure assembly according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of a DC-DC control module according to an embodiment of the present invention;

[0043] Figure 3 This is a flow chart of a method for reducing pressure when starting a battery stack structure assembly according to an embodiment of the present invention;

[0044] Figure 4 This is a flow chart of the voltage reduction method when the battery stack structure assembly is shut down according to an embodiment of the present invention.

[0045] Reference numerals:

[0046] 100-battery stack structure assembly, 1-battery stack module, 2-DC-DC control module, 21-input end, 22-output end, 23-voltage processing unit, 3-control switch, 4-battery module, 5-input capacitor, 6-inductor, 7-diode, 8-output capacitor. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] The following will refer to the attached Figure 1-Figure 4 The stack structure assembly 100 of the embodiment of the present invention is described in detail in conjunction with the embodiment. Figure 1 As shown, the battery stack structure assembly 100 according to an embodiment of the present invention includes: a battery stack module 1 and a DC-DC control module 2. Further, the battery stack module 1 and the DC-DC control module 2 are connected, and the battery stack module 1 provides voltage for the DC-DC control module 2. Further, the working mode of the DC-DC control module 2 includes a first working mode and a second working mode. In the first working mode, the DC-DC control module 2 can control the battery stack module 1 to increase the voltage, and in the second working mode, the DC-DC control module 2 can control the battery stack module 1 to reduce the voltage, thereby achieving the purpose of reducing the working voltage of the battery stack module 1 to meet the working condition requirements. Furthermore, the first working mode and the second working mode can be switched, thereby realizing the diversification of the functions of the DC-DC control module 2.

[0051] In the prior art, the method for reducing the voltage of the battery stack module is to connect a resistor component, but this will cause the problem of complex component layout and occupying more space. However, the battery stack structure assembly 100 of the embodiment of the present invention has a low space occupancy rate and can achieve the purpose of reducing the voltage through a DC-DC control module.

[0052] The stack structure assembly 100 according to the embodiment of the present invention has a low space occupancy rate and can achieve the purpose of voltage reduction through a DC-DC control module, which is conducive to improving customer satisfaction.

[0053] According to an embodiment of the present invention, the battery stack structure assembly 100 is as follows: Figure 2 As shown, the DC-DC control module 2 includes: an input terminal 21, a plurality of voltage processing units 23 and an output terminal 22. Further, the stack module 1 generates voltage on the positive and negative electrodes through chemical reactions, and the voltage of the stack module 1 is connected to the DC-DC control module 2 through the input terminal 21, which is the input voltage of the DC-DC control module 2. Further, the input terminal 21 includes an input capacitor 5, which can eliminate the input ripple voltage, thereby preventing the input ripple voltage from damaging the DC-DC control module 2. Further, each voltage processing unit 23 includes a control switch 3. In the second working mode, current is passed through the control switch 3 through current closed-loop control to consume energy and reduce the voltage of the stack module 1. Specifically, a small PWM (Pulse Width Modulation) duty cycle can be generated through current closed-loop control, so that a small current passes through the control switch 3, thereby realizing the control of the control switch 3. Further, the control switch 3 can consume the power generated by the stack module 1 in the form of heat, thereby achieving the purpose of reducing the voltage of the stack module 1. Furthermore, the output terminal 22 is connected to the battery module 4. In the second working mode, the voltage of the output terminal 22 is not greater than the voltage of the battery module 4, so that the current of the DC-DC control module 2 will not flow to other load devices, and the power generated by the battery stack module 1 is only consumed in the DC-DC control module 2. Furthermore, each voltage processing unit 23 also includes: an inductor 6, a diode 7, an output capacitor 8 and an IGBT (Insulated Gate Bipolar Transistor). Further, the inductor 6 can be used to store energy; further, the diode 7 can realize the unidirectional flow of current; further, the output capacitor 8 can eliminate the output ripple voltage; further, the IGBT can be used to adjust the output voltage.

[0054] According to the battery stack structure assembly 100 of an embodiment of the present invention, the DC-DC control module 2 also includes: a voltage detection module. Further, the voltage detection module can monitor the voltages of the input terminal 21, the voltage processing unit 23 and the output terminal 22, thereby facilitating the closed-loop detection of the voltage in the DC-DC control module 2, so that the DC-DC control module 2 has a better and more accurate voltage reduction effect on the battery stack module 1.

[0055] According to the embodiment of the present invention, the stack structure assembly 100 further includes: a cooling device (not shown in the figure). Further, the cooling device is connected to the DC-DC control module 2 to cool the DC-DC control module 2. Further, a temperature sensor (not shown in the figure) is provided on the cooling device, and the temperature sensor can monitor the cooling water temperature of the DC-DC control module 2.

[0056] According to the battery stack structure assembly 100 of an embodiment of the present invention, in the second working mode, the working power of the DC-DC control module 2 is not greater than one percent of the rated power; further, the working current of the DC-DC control module 2 is not greater than one tenth of the rated current through the current closed-loop control.

[0057] According to the battery stack structure assembly 100 of the embodiment of the present invention, the first working mode is a normal working mode, and the second working mode is a power consumption mode, thereby achieving the diversification of the functions of the DC-DC control module 2.

[0058] In summary, the stack structure assembly 100 according to the embodiment of the present invention has a low space occupancy rate and can achieve the purpose of voltage reduction through a DC-DC control module, which is conducive to improving customer satisfaction.

[0059] According to the second aspect of the present invention, the voltage reduction method of the stack structure assembly 100 is as follows: Figure 3 As shown, the pressure reduction method can be applied to the battery stack structure assembly 100 of the first aspect of the present invention. Further, when the battery stack structure assembly 100 is started, the pressure reduction method includes the following steps:

[0060] S101, when the battery stack structure assembly 100 is started, the DC-DC control module 2 monitors the voltage of the battery stack structure assembly 100 in real time;

[0061] S102, when the voltage of the stack structure assembly 100 reaches a specified voltage, the DC-DC control module 2 operates in the second operating mode;

[0062] S103, the DC-DC control module 2 monitors the current of the control switch 3 in real time, and performs current closed-loop control on the control switch 3 to limit the current of the control switch 3 to not exceed a specified current; this can prevent the control switch 3 from being burned out and increase the service life of the control switch 3.

[0063] S104, the DC-DC control module 2 monitors the voltage of the output terminal 22 in real time to limit the voltage of the output terminal 22 to be no greater than the voltage of the battery module 4; in this way, the power generated by the battery stack module 1 is consumed only in the DC-DC control module 2.

[0064] S105 , the cooling device monitors the cooling water temperature of the DC-DC control module 2 in real time to limit the cooling water temperature of the DC-DC control module 2 to not be greater than a safe temperature; thereby facilitating extending the service life of the DC-DC control module 2 .

[0065] S106, when the voltage of the battery stack module 1 is stable, that is, the voltage of the input terminal 21 is stable, the working mode of the DC-DC control module 2 is switched from the second working mode to the first working mode.

[0066] According to the second aspect of the present invention, the voltage reduction method of the stack structure assembly 100 is as follows: Figure 4 As shown, the pressure reduction method can be applied to the battery stack structure assembly 100 of the first aspect of the present invention. Further, when the battery stack structure assembly 100 is shut down, the pressure reduction method includes the following steps:

[0067] S201, when the stack structure assembly 100 is shut down, the DC-DC control module 2 is in the first working mode;

[0068] S202, when the voltage of the stack module 1 needs to be reduced, the working mode of the DC-DC control module 2 is switched from the first working mode to the second working mode;

[0069] S203, the DC-DC control module 2 monitors the current of the control switch 3 in real time, and performs current closed-loop control on the control switch 3 to limit the current of the control switch 3 to not exceed the specified current; this can prevent the control switch 3 from being burned out and increase the service life of the control switch 3.

[0070] S204, the DC-DC control module 2 monitors the voltage of the output terminal 22 in real time to limit the voltage of the output terminal 22 to be no greater than the voltage of the battery module 4; in this way, the power generated by the battery stack module 1 is consumed only in the DC-DC control module 2.

[0071] S205 , the cooling device monitors the cooling water temperature of the DC-DC control module 2 in real time to limit the cooling water temperature of the DC-DC control module 2 to not be greater than a safe temperature; thereby facilitating extending the service life of the DC-DC control module 2 .

[0072] S206, when the voltage of the battery stack module 1 reaches the specified voltage, the DC-DC control module 2 is turned off to complete the shutdown of the battery stack structure assembly 100.

[0073] In summary, according to the pressure reduction method of the battery stack structure assembly 100 described in the second aspect of the present invention, the pressure reduction effect of the battery stack structure assembly is better and the customer satisfaction is higher.

[0074] The fuel cell for a vehicle according to the third aspect of the present invention comprises: the battery stack structure assembly 100 of the first aspect of the present invention and a battery case (not shown in the figure); further, the battery stack structure assembly 100 is encapsulated in the battery case, thereby facilitating improving the sealing performance of the battery stack structure assembly 100.

[0075] In summary, according to the fuel cell for a vehicle described in the third aspect of the present invention, the stack structure assembly 100 has a better pressure reduction effect and higher customer satisfaction.

[0076] According to the non-temporary readable storage medium of the fourth aspect of the present invention, a computer program is stored thereon, and when the computer program is executed by a processor, a method for reducing the pressure of the battery stack structure assembly 100 as in the second aspect of the present invention is implemented.

[0077] In summary, according to the non-temporary readable storage medium of the fourth aspect of the present invention, the voltage reduction effect of controlling the fuel cell structure assembly 100 is better and the customer satisfaction is higher.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0079] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery stack structure assembly (100), characterized in that: include: Fuel stack module (1); A DC-DC control module (2), the stack module (1) and the DC-DC control module (2) are connected, the stack module (1) provides voltage for the DC-DC control module (2), the working mode of the DC-DC control module (2) comprises a first working mode and a second working mode, in the first working mode, the DC-DC control module (2) can control the stack module (1) to increase the voltage, in the second working mode, the DC-DC control module (2) can control the stack module (1) to decrease the voltage, and the first working mode and the second working mode are switchable; The DC-DC control module (2) comprises: An input end (21), the voltage of the battery stack module (1) is connected to the DC-DC control module (2) via the input end (21), the input end (21) comprising an input capacitor (5), and the input capacitor (5) can eliminate input ripple voltage; A plurality of voltage processing units (23), each of the voltage processing units (23) comprising a control switch (3), wherein in the second working mode, current is passed through the control switch (3) through current closed loop control, and the control switch (3) consumes energy and reduces the voltage of the battery stack module (1) in the form of heat; an output end (22), the output end (22) being connected to a battery module (4), and in the second working mode, a voltage of the output end (22) is not greater than a voltage of the battery module (4); A voltage detection module, the voltage detection module monitors the voltages of the input end (21), the voltage processing unit (23) and the output end (22); In the second working mode, the working power of the DC-DC control module (2) is not greater than 1 percent of the rated power; and the working current of the DC-DC control module (2) is not greater than 1 tenth of the rated current through current closed-loop control.

2. The battery stack structure assembly (100) according to claim 1, characterized in that: The voltage processing unit further comprises: an inductor (6), a diode (7) and an output capacitor (8); the inductor (6) can store energy; the diode (7) can ensure unidirectional flow of current; the control switch (3) is an IGBT and can adjust the output voltage; and the output capacitor (8) can eliminate output ripple voltage.

3. The battery stack structure assembly (100) according to claim 1, characterized in that: Also includes: A cooling device, the cooling device is connected to the DC-DC control module (2) to cool the DC-DC control module (2), and a temperature sensor is provided on the cooling device, and the temperature sensor can monitor the cooling water temperature of the DC-DC control module (2).

4. The fuel cell stack structure assembly (100) according to any one of claims 1 to 3, characterized in that: The first working mode is a normal working mode, and the second working mode is a power consumption mode.

5. A method for reducing the pressure of a battery stack structure assembly (100), characterized in that: The depressurization method can be applied to the battery stack structure assembly (100) according to any one of claims 1 to 4. When the battery stack structure assembly (100) is started, the depressurization method comprises the following steps: S101, when the battery stack structure assembly (100) is started, the DC-DC control module (2) monitors the voltage of the battery stack structure assembly (100) in real time; S102, when the voltage of the battery stack structure assembly (100) reaches a specified voltage, the DC-DC control module (2) operates in the second operating mode; S103, the DC-DC control module (2) monitors the current of the control switch (3) in real time, and performs current closed-loop control on the control switch (3) to limit the current of the control switch (3) to not exceed a specified current; S104, the DC-DC control module (2) monitors the voltage of the output terminal (22) in real time to limit the voltage of the output terminal (22) to be no greater than the voltage of the battery module (4); S105, the cooling device monitors the cooling water temperature of the DC-DC control module (2) in real time to limit the cooling water temperature of the DC-DC control module (2) to no greater than a safe temperature; S106: When the voltage of the battery stack module (1) is stable, that is, when the voltage of the input terminal (21) is stable, the working mode of the DC-DC control module (2) is switched from the second working mode to the first working mode.

6. A method for reducing the pressure of a battery stack structure assembly (100), characterized in that: The depressurization method can be applied to the battery stack structure assembly (100) according to any one of claims 1 to 4. When the battery stack structure assembly (100) is shut down, the depressurization method comprises the following steps: S201, when the battery stack structure assembly (100) is shut down, the DC-DC control module (2) is in the first working mode; S202, when it is necessary to reduce the voltage of the battery stack module (1), the working mode of the DC-DC control module (2) is switched from the first working mode to the second working mode; S203, the DC-DC control module (2) monitors the current of the control switch (3) in real time, and performs current closed-loop control on the control switch (3) to limit the current of the control switch (3) to not exceed a specified current; S204, the DC-DC control module (2) monitors the voltage of the output terminal (22) in real time to limit the voltage of the output terminal (22) to be no greater than the voltage of the battery module (4); S205, the cooling device monitors the cooling water temperature of the DC-DC control module (2) in real time to limit the cooling water temperature of the DC-DC control module (2) to no greater than a safe temperature; S206: When the voltage of the battery stack module (1) reaches a specified voltage, the DC-DC control module (2) is turned off to complete the shutdown of the battery stack structure assembly (100).

7. A fuel cell for a vehicle, characterized in that: include: The battery stack structure assembly (100) according to any one of claims 1 to 4; A battery box, in which the battery stack structure assembly (100) is packaged.

8. A non-temporary readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the voltage reduction method of the battery stack structure assembly (100) according to claim 5 or 6 is implemented.

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