Battery pack air pressure balance control method, device and equipment and readable storage medium

Abstract

The invention provides a battery pack air pressure balance control method, device and equipment and a readable storage medium, and the method comprises the steps: if the internal and external pressure difference of a battery pack is greater than or equal to a first preset threshold value, and the external liquid level of the battery pack does not reach a preset position, an anti-explosion ventilation valve is controlled to be opened, and the preset position is lower than the exhaust position of the anti-explosion ventilation valve; if the internal and external pressure difference of the battery pack is larger than or equal to a second preset threshold value, the anti-explosion ventilation valve is controlled to be opened, and the second preset threshold value is larger than the first preset threshold value; if the internal and external pressure difference of the battery pack is smaller than a third preset threshold value, the anti-explosion ventilation valve is controlled to be closed, and the third preset threshold value is smaller than the first preset threshold value. Through the application, water can be prevented from entering the battery pack as much as possible while effective explosion prevention is realized, so that the battery upper cover and internal sensitive elements are protected, and a guarantee is provided for stable and reliable work of a power battery system.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack gas pressure balance control method, device, equipment and readable storage medium. Background Art

[0002] As new energy vehicles become more and more popular, the safety and reliability of power battery modules, as core components of new energy vehicles, have always attracted much attention. The development of high-safety, high-reliability, long-life, and high-performance power batteries is the focus and difficulty in the field of new energy vehicles. Explosion-proof vent valves are widely used in new energy vehicle power batteries as components that keep the internal environment of the battery pack clean, maintain the balance of air pressure inside and outside the battery pack, and prevent explosion and pressure relief when the air pressure changes suddenly. When designing power battery boxes for new energy vehicles, explosion-proof balance valves have become standard configurations to prevent vehicles from being affected by water mist, dust, and high and low temperatures in their use scenarios, and to provide guarantees for the stable and reliable operation of the power battery system.

[0003] At present, the battery pack cover has become thinner and lighter with the requirements of energy density and other factors. When the opening pressure of the explosion-proof vent valve is high, it may not be able to properly perform the explosion-proof function. When the opening pressure of the explosion-proof vent valve is low, water is likely to enter the battery pack, causing the battery to short-circuit and then catch fire and explode. Therefore, how to effectively prevent explosions while avoiding water from entering the battery pack as much as possible is an urgent problem to be solved. Summary of the invention

[0004] The present application provides a battery pack air pressure balance control method, device, equipment and readable storage medium, which can effectively prevent explosion while avoiding water from entering the battery pack as much as possible.

[0005] In a first aspect, an embodiment of the present application provides a battery pack gas pressure balance control method, the battery pack gas pressure balance control method comprising:

[0006] If the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold value, and the liquid level outside the battery pack has not reached the preset position, the explosion-proof vent valve is controlled to open, wherein the preset position is lower than the exhaust position of the explosion-proof vent valve;

[0007] If the pressure difference between the inside and outside of the battery pack is greater than or equal to a second preset threshold, the explosion-proof vent valve is controlled to open, wherein the second preset threshold is greater than the first preset threshold;

[0008] If the pressure difference between the inside and outside of the battery pack is less than a third preset threshold, the explosion-proof vent valve is controlled to close, wherein the third preset threshold is less than the first preset threshold.

[0009] Furthermore, in one embodiment, after the step of controlling the explosion-proof vent valve to open, the following steps are further included:

[0010] Record the opening status of the explosion-proof vent valve and the external liquid level of the battery pack when it is opened.

[0011] Furthermore, in one embodiment, the step of controlling the opening of the explosion-proof vent valve includes:

[0012] Determine the target valve opening according to the pressure difference between the inside and outside of the battery pack and the calibration curve;

[0013] Control the explosion-proof vent valve to open to the target valve opening.

[0014] Furthermore, in one embodiment, the explosion-proof air valve is configured as an electric balancing valve.

[0015] Furthermore, in one embodiment, the first preset threshold is equal to 5 kPa, the second preset threshold is equal to 10 kPa, and the third preset threshold is equal to 3 kPa.

[0016] Furthermore, in one embodiment, the battery pack gas pressure balance control method further includes:

[0017] During the period when the explosion-proof vent valve is closed, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold and the second preset threshold;

[0018] When the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold and less than the second preset threshold, monitoring the relationship between the external liquid level of the battery pack and the preset position;

[0019] While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

[0020] Furthermore, in one embodiment, the battery pack gas pressure balance control method further includes:

[0021] When the explosion-proof vent valve is closed, monitor the relationship between the external liquid level of the battery pack and the preset position;

[0022] When the liquid level outside the battery pack does not reach the preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold value;

[0023] When the liquid level outside the battery pack reaches or exceeds a preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and a second preset threshold value;

[0024] While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

[0025] In a second aspect, an embodiment of the present application further provides a battery pack gas pressure balance control device, the battery pack gas pressure balance control device comprising:

[0026] A first opening module, configured to control the explosion-proof vent valve to open if the pressure difference between the inside and outside of the battery pack is greater than or equal to a first preset threshold value and the external liquid level of the battery pack has not reached a preset position, wherein the preset position is lower than the exhaust position of the explosion-proof vent valve;

[0027] A second opening module, used to control the explosion-proof vent valve to open if the pressure difference between the inside and outside of the battery pack is greater than or equal to a second preset threshold, wherein the second preset threshold is greater than the first preset threshold;

[0028] The closing module is used to control the explosion-proof vent valve to close if the pressure difference between the inside and outside of the battery pack is less than a third preset threshold, wherein the third preset threshold is less than the first preset threshold.

[0029] In the third aspect, an embodiment of the present application also provides a battery pack air pressure balance control device, which includes a processor, a memory, and a battery pack air pressure balance control program stored in the memory and executable by the processor, wherein when the battery pack air pressure balance control program is executed by the processor, the steps of the above-mentioned battery pack air pressure balance control method are implemented.

[0030] In a fourth aspect, an embodiment of the present application further provides a readable storage medium, on which a battery pack air pressure balance control program is stored, wherein when the battery pack air pressure balance control program is executed by a processor, the steps of the above-mentioned battery pack air pressure balance control method are implemented.

[0031] In this application, the opening pressure of the explosion-proof vent valve is determined by the pressure difference between the inside and outside of the battery pack and the external liquid level of the battery pack. When the external liquid level of the battery pack has not reached the preset position and there is no risk of water ingress, a lower first preset threshold is used as the opening pressure to exhaust as soon as possible to reduce the risk of explosion. When the external liquid level of the battery pack reaches the preset position and there is a risk of water ingress, a higher second preset threshold is used as the opening pressure to avoid water ingress to the battery pack as much as possible. In addition, the explosion-proof vent valve adopts a reusable structure, and is closed in time when the pressure difference between the inside and outside of the battery pack is less than the third preset threshold and the exhaust is completed, further reducing the risk of water ingress. Through this application, while effectively preventing explosions, water ingress to the battery pack can be avoided as much as possible, thereby protecting the battery cover and internal sensitive components, and providing a guarantee for the stable and reliable operation of the power battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a flow chart of a battery pack gas pressure balance control method in one embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the structure of a battery pack air pressure balance control system in one embodiment of the present application;

[0034] Figure 3This is a flow chart of a battery pack gas pressure balance control method in one embodiment of the present application;

[0035] Figure 4 This is a flow chart of a battery pack gas pressure balance control method in one embodiment of the present application;

[0036] Figure 5 This is a schematic diagram of the functional modules of a battery pack air pressure balance control device in one embodiment of the present application;

[0037] Figure 6 This is a schematic diagram of the hardware structure of the battery pack air pressure balance control device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0040] The explosion-proof vent valves currently used in the market have two integrated functions: one is to balance the pressure inside and outside the battery pack to protect the internal components of the battery pack. This function plays the role of a balancing vent valve. The second is to prevent excessive gas pressure and explosion of the box by actively blasting the valve and quickly opening the explosion-proof valve function of the exhaust channel when a violent chemical reaction occurs in the battery cell and a large amount of gas is produced.

[0041] The balanced vent valve uses a waterproof and breathable membrane material, which can maintain a certain amount of air permeability under a certain pressure and play a waterproof role. The breathable membrane material is generally strong in toughness, and can withstand greater pressure without damage while being waterproof and breathable.

[0042] There are generally two structures of explosion-proof valves. One is a pin-type explosion-proof valve. When the pressure difference between the inside and outside of the battery pack exceeds the threshold, the breathable membrane is ruptured through the mechanical structure, thereby quickly opening the exhaust channel to achieve the purpose of rapid pressure relief. The other is a spring-type explosion-proof valve. When the pressure difference between the inside and outside of the battery pack increases and exceeds the compression force of the explosion-proof valve spring, the explosion-proof valve is pushed to open a gap and open the exhaust channel. When the pressure difference between the inside and outside of the battery pack decreases, the spring is tightened and the valve is closed again.

[0043] Both explosion-proof valves have their own defects. The ejector-type explosion-proof valve is a one-time structure. It needs to be replaced after being damaged, and it is easy to be triggered by mistake, and the waterproof and breathable membrane material fails, causing water to enter the battery pack. The spring-type explosion-proof valve uses a spring to tighten the valve cover to ensure that the battery pack is sealed and waterproof. It is easily affected by the performance and aging of the spring, causing the valve cover to loosen, thereby causing water to enter the battery pack.

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0045] In a first aspect, an embodiment of the present application provides a battery pack gas pressure balance control method.

[0046] Figure 1 A flow chart of a battery pack gas pressure balance control method in one embodiment of the present application is shown.

[0047] Reference Figure 1 In one embodiment, the battery pack gas pressure balance control method includes the following steps:

[0048] S11. If the pressure difference between the inside and outside of the battery pack is greater than or equal to a first preset threshold value, and the liquid level outside the battery pack has not reached a preset position, the explosion-proof vent valve is controlled to open, wherein the preset position is lower than the exhaust position of the explosion-proof vent valve.

[0049] In this embodiment, the liquid level outside the battery pack has not reached the preset position, indicating that there is no risk of water ingress at this time, and the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold, indicating that there is a lower explosion risk at this time. Controlling the explosion-proof vent valve to open can exhaust air as soon as possible to reduce the explosion risk.

[0050] S12: If the pressure difference between the inside and outside of the battery pack is greater than or equal to a second preset threshold, the explosion-proof vent valve is controlled to open, wherein the second preset threshold is greater than the first preset threshold.

[0051] In this embodiment, the pressure difference between the inside and outside of the battery pack is greater than or equal to the second preset threshold, and the second preset threshold is greater than the first preset threshold, indicating that there is a high risk of explosion at this time. Even if the external liquid level of the battery pack reaches or exceeds the preset position and there is a risk of water ingress, it is necessary to control the explosion-proof ventilation valve to open and give priority to reducing the risk of explosion.

[0052] S13: If the pressure difference between the inside and outside of the battery pack is less than a third preset threshold, the explosion-proof vent valve is controlled to close, wherein the third preset threshold is less than the first preset threshold.

[0053] In this embodiment, the pressure difference between the inside and outside of the battery pack is less than the third preset threshold, and the third preset threshold is less than the first preset threshold, indicating that there is no explosion risk at this time, the exhaust is completed, and controlling the explosion-proof vent valve to close can further reduce the risk of water ingress.

[0054] For example, the first preset threshold is equal to 5 kPa, the second preset threshold is equal to 10 kPa, and the third preset threshold is equal to 3 kPa.

[0055] Therefore, in this embodiment, the opening pressure of the explosion-proof vent valve is determined by the pressure difference between the inside and outside of the battery pack and the external liquid level of the battery pack. When the external liquid level of the battery pack has not reached the preset position and there is no risk of water ingress, a lower first preset threshold is used as the opening pressure to exhaust as soon as possible to reduce the risk of explosion. When the external liquid level of the battery pack reaches the preset position and there is a risk of water ingress, a higher second preset threshold is used as the opening pressure to avoid water ingress to the battery pack as much as possible. In addition, the explosion-proof vent valve adopts a reusable structure, and is closed in time when the pressure difference between the inside and outside of the battery pack is less than the third preset threshold and the exhaust is completed, further reducing the risk of water ingress. Through this embodiment, while effectively preventing explosions, water ingress to the battery pack can be avoided as much as possible, thereby protecting the battery cover and internal sensitive components, and providing a guarantee for the stable and reliable operation of the power battery system.

[0056] It should be noted that the basic requirements of the explosion-proof breathable valve in this embodiment include two aspects. On the one hand, the explosion-proof breathable valve is a reusable structure and can be closed again after opening, so it cannot be the ejector-type explosion-proof valve mentioned above. On the other hand, the opening pressure of the explosion-proof breathable valve is adjustable, so it cannot be the spring-type explosion-proof valve mentioned above, because the opening pressure of the spring-type explosion-proof valve is determined by the mechanical structure.

[0057] Optionally, in one embodiment, the explosion-proof vent valve is configured as an electric balancing valve.

[0058] Figure 2 A schematic diagram of the structure of a battery pack air pressure balance control system in one embodiment of the present application is shown.

[0059] For example, refer to Figure 2 The battery pack air pressure balance control system includes a control device 100 and a battery pack 200. An electric balance valve 210 is provided on the shell of the battery pack 200. A pressure sensor 220 is provided inside the battery pack 200. The internal pressure of the battery pack measured by the pressure sensor 220 and the atmospheric pressure outside the battery pack can calculate the pressure difference between the inside and outside of the battery pack. A liquid level sensor 230 is provided outside the battery pack 200. The liquid level sensor 230 outputs a low-level signal when the external liquid level of the battery pack does not reach a preset position, and outputs a high-level signal when the external liquid level of the battery pack reaches or exceeds a preset position. The control device 100 is connected to the electric balance valve 210, the pressure sensor 220 and the liquid level sensor 230, and controls the electric balance valve 210 to open according to the signals of the pressure sensor 220 and the liquid level sensor 230, and controls the electric balance valve 210 to close according to the signal of the pressure sensor 220.

[0060] Furthermore, in one embodiment, after the step of controlling the explosion-proof vent valve to open, the following steps are further included:

[0061] Record the opening status of the explosion-proof vent valve and the external liquid level of the battery pack when it is opened.

[0062] In this embodiment, the user can record the opening status of the explosion-proof vent valve and the external liquid level of the battery pack when it is opened, and promptly check for water ingress into the battery pack, thereby further reducing the safety hazard caused by water ingress into the battery pack after the explosion-proof vent valve is opened.

[0063] Furthermore, in one embodiment, the step of controlling the opening of the explosion-proof vent valve includes:

[0064] Determine the target valve opening according to the pressure difference between the inside and outside of the battery pack and the calibration curve;

[0065] Control the explosion-proof vent valve to open to the target valve opening.

[0066] In this embodiment, the valve opening is determined according to the pressure difference between the inside and outside of the battery pack when the valve is judged to be open, which helps to improve the control accuracy. For example, within a certain range, the greater the pressure difference between the inside and outside of the battery pack, the greater the valve opening.

[0067] Furthermore, in one embodiment, the battery pack gas pressure balance control method further includes:

[0068] During the period when the explosion-proof vent valve is closed, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold and the second preset threshold;

[0069] When the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold and less than the second preset threshold, monitoring the relationship between the external liquid level of the battery pack and the preset position;

[0070] While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

[0071] In this embodiment, an optional method for monitoring the pressure difference between the inside and outside of the battery pack and the external liquid level of the battery pack is specified. There is no need to monitor the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold, the second preset threshold and the third preset threshold throughout the entire process, as well as the relationship between the external liquid level of the battery pack and the preset position, which helps to reduce the amount of calculation.

[0072] Figure 3 A flow chart of a battery pack gas pressure balance control method in one embodiment of the present application is shown.

[0073] For example, refer to Figure 3, if the explosion-proof ventilation valve is closed, the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold and the second preset threshold is monitored. If the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold and less than the second preset threshold, the relationship between the external liquid level of the battery pack and the preset position is monitored. If the external liquid level of the battery pack does not reach the preset position, the explosion-proof ventilation valve is controlled to open, corresponding to the operation of step S11, otherwise the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold and the second preset threshold is continued to be monitored. If the pressure difference between the inside and outside of the battery pack is greater than or equal to the second preset threshold, the explosion-proof ventilation valve is controlled to open, corresponding to the operation of step S12. If the pressure difference between the inside and outside of the battery pack is less than the first preset threshold, the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold and the second preset threshold is continued to be monitored. If the explosion-proof ventilation valve is opened, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored. If the pressure difference between the inside and outside of the battery pack is less than the third preset threshold, the explosion-proof ventilation valve is controlled to close, corresponding to the operation of step S13, otherwise the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is continued to be monitored.

[0074] Furthermore, in one embodiment, the battery pack gas pressure balance control method further includes:

[0075] When the explosion-proof vent valve is closed, monitor the relationship between the external liquid level of the battery pack and the preset position;

[0076] When the liquid level outside the battery pack does not reach the preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold value;

[0077] When the liquid level outside the battery pack reaches or exceeds a preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and a second preset threshold value;

[0078] While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

[0079] In this embodiment, another optional method for monitoring the pressure difference between the inside and outside of the battery pack and the external liquid level of the battery pack is specified. There is no need to monitor the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold, the second preset threshold and the third preset threshold throughout the entire process, as well as the relationship between the external liquid level of the battery pack and the preset position, which helps to reduce the amount of calculation.

[0080] Figure 4 A flow chart of a battery pack gas pressure balance control method in one embodiment of the present application is shown.

[0081] For example, refer to Figure 4, if the explosion-proof ventilation valve is closed, the relationship between the external liquid level of the battery pack and the preset position is monitored. If the external liquid level of the battery pack does not reach the preset position, the relationship between the internal and external pressure difference of the battery pack and the first preset threshold is monitored. If the internal and external pressure difference of the battery pack is greater than or equal to the first preset threshold, the explosion-proof ventilation valve is controlled to open, corresponding to the operation of step S11, otherwise the relationship between the external liquid level of the battery pack and the preset position is continued to be monitored. If the external liquid level of the battery pack reaches or exceeds the preset position, the relationship between the internal and external pressure difference of the battery pack and the second preset threshold is monitored. If the internal and external pressure difference of the battery pack is greater than or equal to the second preset threshold, the explosion-proof ventilation valve is controlled to open, corresponding to the operation of step S12, otherwise the relationship between the external liquid level of the battery pack and the preset position is continued to be monitored. If the explosion-proof ventilation valve is opened, the relationship between the internal and external pressure difference of the battery pack and the third preset threshold is monitored. If the internal and external pressure difference of the battery pack is less than the third preset threshold, the explosion-proof ventilation valve is controlled to close, corresponding to the operation of step S13, otherwise the relationship between the internal and external pressure difference of the battery pack and the third preset threshold is continued to be monitored.

[0082] In a second aspect, an embodiment of the present application also provides a battery pack air pressure balance control device.

[0083] Figure 5 A schematic diagram of the functional modules of a battery pack air pressure balance control device in one embodiment of the present application is shown.

[0084] Reference Figure 5 In one embodiment, the battery pack gas pressure balance control device includes:

[0085] The first opening module 10 is used to control the explosion-proof vent valve to open if the pressure difference between the inside and outside of the battery pack is greater than or equal to a first preset threshold value and the liquid level outside the battery pack has not reached a preset position, wherein the preset position is lower than the exhaust position of the explosion-proof vent valve;

[0086] A second opening module 20, configured to control the explosion-proof vent valve to open if the pressure difference between the inside and outside of the battery pack is greater than or equal to a second preset threshold, wherein the second preset threshold is greater than the first preset threshold;

[0087] The closing module 30 is used to control the explosion-proof vent valve to close if the pressure difference between the inside and outside of the battery pack is less than a third preset threshold, wherein the third preset threshold is less than the first preset threshold.

[0088] Furthermore, in one embodiment, the battery pack gas pressure balance control device further includes a recording module, which is used to:

[0089] Record the opening status of the explosion-proof vent valve and the external liquid level of the battery pack when it is opened.

[0090] Furthermore, in one embodiment, the first opening module 10 and the second opening module 20 are used to:

[0091] Determine the target valve opening according to the pressure difference between the inside and outside of the battery pack and the calibration curve;

[0092] Control the explosion-proof vent valve to open to the target valve opening.

[0093] Furthermore, in one embodiment, the explosion-proof air valve is configured as an electric balancing valve.

[0094] Furthermore, in one embodiment, the first preset threshold is equal to 5 kPa, the second preset threshold is equal to 10 kPa, and the third preset threshold is equal to 3 kPa.

[0095] Furthermore, in one embodiment, the battery pack gas pressure balance control device further includes a monitoring module, which is used to:

[0096] During the period when the explosion-proof vent valve is closed, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold and the second preset threshold;

[0097] When the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold and less than the second preset threshold, monitoring the relationship between the external liquid level of the battery pack and the preset position;

[0098] While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

[0099] Furthermore, in one embodiment, the battery pack gas pressure balance control device further includes a monitoring module, which is used to:

[0100] When the explosion-proof vent valve is closed, monitor the relationship between the external liquid level of the battery pack and the preset position;

[0101] When the liquid level outside the battery pack does not reach the preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold value;

[0102] When the liquid level outside the battery pack reaches or exceeds a preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and a second preset threshold value;

[0103] While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

[0104] Among them, the functional implementation of each module in the above-mentioned battery pack air pressure balance control device corresponds to the various steps in the above-mentioned battery pack air pressure balance control method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0105] In a third aspect, an embodiment of the present application provides a battery pack air pressure balance control device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0106] Figure 6A schematic diagram of the hardware structure of a battery pack air pressure balance control device involved in an embodiment of the present application is shown.

[0107] Reference Figure 6 In an embodiment of the present application, a battery pack air pressure balance control device may include a processor, a memory, a communication interface, and a communication bus.

[0108] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0109] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the battery pack gas pressure balance control device, and the interface used to realize the interconnection between the battery pack gas pressure balance control device and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0110] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0111] The processor may be a general-purpose processor, which may call the battery pack air pressure balance control program stored in the memory and execute the battery pack air pressure balance control method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the battery pack air pressure balance control program is called may refer to the various embodiments of the battery pack air pressure balance control method of the present application, which will not be repeated here.

[0112] Those skilled in the art will understand that Figure 6 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0113] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0114] A battery pack air pressure balance control program is stored on a readable storage medium of the present application, wherein when the battery pack air pressure balance control program is executed by a processor, the steps of the battery pack air pressure balance control method as described above are implemented.

[0115] Among them, the method implemented when the battery pack gas pressure balance control program is executed can refer to the various embodiments of the battery pack gas pressure balance control method of the present application, and will not be repeated here.

[0116] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0117] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0118] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0119] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0120] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0121] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0122] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A battery pack gas pressure balance control method, characterized in that: The battery pack gas pressure balance control method comprises: If the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold value, and the liquid level outside the battery pack has not reached the preset position, the explosion-proof vent valve is controlled to open, wherein the preset position is lower than the exhaust position of the explosion-proof vent valve; If the pressure difference between the inside and outside of the battery pack is greater than or equal to a second preset threshold, the explosion-proof vent valve is controlled to open, wherein the second preset threshold is greater than the first preset threshold; If the pressure difference between the inside and outside of the battery pack is less than a third preset threshold, the explosion-proof vent valve is controlled to close, wherein the third preset threshold is less than the first preset threshold.

2. The battery pack gas pressure balance control method according to claim 1, characterized in that: After the step of controlling the explosion-proof vent valve to open, the method further includes: Record the opening status of the explosion-proof vent valve and the external liquid level of the battery pack when it is opened.

3. The battery pack gas pressure balance control method according to claim 1, characterized in that: The step of controlling the opening of the explosion-proof vent valve comprises: Determine the target valve opening according to the pressure difference between the inside and outside of the battery pack and the calibration curve; Control the explosion-proof vent valve to open to the target valve opening.

4. The battery pack gas pressure balance control method according to claim 1, characterized in that: The explosion-proof vent valve is configured as an electric balancing valve.

5. The battery pack gas pressure balance control method according to claim 1, characterized in that: The first preset threshold is equal to 5 kPa, the second preset threshold is equal to 10 kPa, and the third preset threshold is equal to 3 kPa.

6. The battery pack gas pressure balance control method according to any one of claims 1 to 5, characterized in that: The battery pack gas pressure balance control method further includes: During the period when the explosion-proof vent valve is closed, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold and the second preset threshold; When the pressure difference between the inside and outside of the battery pack is greater than or equal to the first preset threshold and less than the second preset threshold, monitoring the relationship between the external liquid level of the battery pack and the preset position; While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

7. The battery pack gas pressure balance control method according to any one of claims 1 to 5, characterized in that: The battery pack gas pressure balance control method further includes: When the explosion-proof vent valve is closed, monitor the relationship between the external liquid level of the battery pack and the preset position; When the liquid level outside the battery pack does not reach the preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and the first preset threshold value; When the liquid level outside the battery pack reaches or exceeds a preset position, monitoring the relationship between the pressure difference between the inside and outside of the battery pack and a second preset threshold value; While the explosion-proof vent valve is open, the relationship between the pressure difference between the inside and outside of the battery pack and the third preset threshold is monitored.

8. A battery pack gas pressure balance control device, characterized in that: The battery pack gas pressure balance control device comprises: A first opening module, configured to control the explosion-proof vent valve to open if the pressure difference between the inside and outside of the battery pack is greater than or equal to a first preset threshold value and the external liquid level of the battery pack has not reached a preset position, wherein the preset position is lower than the exhaust position of the explosion-proof vent valve; A second opening module, used to control the explosion-proof vent valve to open if the pressure difference between the inside and outside of the battery pack is greater than or equal to a second preset threshold, wherein the second preset threshold is greater than the first preset threshold; The closing module is used to control the explosion-proof vent valve to close if the pressure difference between the inside and outside of the battery pack is less than a third preset threshold, wherein the third preset threshold is less than the first preset threshold.

9. A battery pack gas pressure balance control device, characterized in that: The battery pack air pressure balance control device includes a processor, a memory, and a battery pack air pressure balance control program stored in the memory and executable by the processor, wherein when the battery pack air pressure balance control program is executed by the processor, the steps of the battery pack air pressure balance control method as described in any one of claims 1 to 7 are implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a battery pack air pressure balance control program, wherein when the battery pack air pressure balance control program is executed by a processor, the steps of the battery pack air pressure balance control method according to any one of claims 1 to 7 are implemented.

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