Control module, battery pack and energy storage power supply

Abstract

The utility model provides a control module, a battery pack and an energy storage power supply. The control module is applied to the battery pack. The control module comprises a control panel, a flash memory and a flame-retardant part. The control panel is configured to be arranged in a battery shell of the battery pack and is adjacent to each battery cell in the battery shell; the flash memory is arranged on the control board. The flash memory is configured to record operational data of the battery pack. The flame-retardant part at least covers one side, facing the safety valve of the battery cell, of the control panel, so that the control panel and the flash memory are separated from the space where the battery cell of the battery pack is located. According to the control module, the battery pack and the energy storage power supply provided by the invention, the safety protection capability of the control module can be improved, and investigation and redisk after an accident are facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of mobile energy storage devices, and in particular to a control module, a battery pack and an energy storage power supply. Background Art

[0002] The mobile energy storage device is equipped with a battery pack, which includes a control module and a battery cell. The control module is used to manage the charging and discharging of the battery cell and monitor various data. In the related technology, once a battery cell blows a valve, the battery cell will produce a large amount of high-temperature gas, and the high-temperature gas will splash onto the control module with combustible particles, causing the control module to melt quickly and unable to continue recording data, which is not conducive to the later investigation and review of the accident. Utility Model Content

[0003] In view of this, the present application provides a control module, a battery pack and an energy storage power supply, which can enhance the safety protection capability of the control module and facilitate post-accident investigation and review.

[0004] One embodiment of the present application provides a control module for use in a battery pack. The control module includes a control board, a flash memory, and a flame retardant. The control board is configured to be disposed in a battery housing of the battery pack and adjacent to each battery cell in the battery housing. The flash memory is disposed on the control board. The flash memory is configured to record operating data of the battery pack. The flame retardant covers at least one side of the control board facing the safety valve of the battery cell, so that the control board and the flash memory are separated from the space where the battery cells of the battery pack are located.

[0005] In the above embodiment, the flash memory is arranged on the control board and records the operating data of the battery pack, so as to facilitate the investigation and review of the accident after the battery pack has an accident. The flame retardant separates the space where the control board and the flash memory are located from the space where the battery cell is located, thereby blocking the dangerous substances such as the gas and combustible particles generated by the battery cell spray valve, improving the safety protection capability of the control module, and reducing the possibility of the above dangerous substances directly burning the flash memory or indirectly burning the flash memory by burning the control board, so that the flash memory can normally record the operating data of the battery pack and retain it after the accident, which is convenient for the investigation and review of the accident.

[0006] In some embodiments of the present application, a protective space is provided in the flame retardant, and the control panel and the flash memory are both located in the protective space.

[0007] In the above embodiment, the flame retardant separates the protection space from other spaces in the battery housing, so that the control board and the flash memory can be protected from the burning of dangerous substances such as gas and combustible particles in the protection space. The flame retardant can fully protect the control board and the flash memory, while maintaining the safety protection capability of the control module, making the installation position of the control module in the battery housing more diverse.

[0008] In some embodiments of the present application, a flash memory is disposed on one of the two opposite sides of the control board, and a flame retardant is disposed on the other side. The flame retardant abuts against the inner wall of the battery housing.

[0009] In the above embodiment, the flame retardant is in contact with the inner wall of the battery housing, so that dangerous substances such as gas and combustible particles cannot spread into the space where the control board is located, thereby protecting the control board and the flash memory from being burned by dangerous substances. The flame retardant does not need to cover the entire control board, which is conducive to reducing production difficulty and saving production costs.

[0010] In some embodiments of the present application, the material of the flame retardant component includes at least one of mica, glass fiber, ceramic silicone, and nano-insulation board.

[0011] Materials such as mica, glass fiber, ceramic silicone, and nano-insulation boards, on the one hand, have high structural strength or can be converted to high structural strength at high temperatures while being fireproof, thereby withstanding the impact of the eruption of dangerous substances such as gas and combustible particles. On the other hand, they have poor thermal conductivity, thereby blocking the high temperature generated by the battery cell spray valve.

[0012] In some embodiments of the present application, along the ejection direction of the safety valve of the battery cell, the projection of the flash memory does not overlap with the projection of the safety valve.

[0013] In the above embodiment, the flash memory and the safety valve are staggered, so as to avoid the impact generated by the eruption of the safety valve directly impacting the location of the flash memory and causing damage to the flash memory, thereby improving the safety of the flash memory.

[0014] One embodiment of the present application provides a battery pack. The battery pack includes a battery cell, a battery housing, and a control module as described in any of the above embodiments. The battery cell is disposed in the battery housing. The control board is disposed in the battery housing. The flame retardant separates the space in the battery housing where the control board and the flash memory are located from the space where the battery cell is located.

[0015] In the above embodiment, the battery pack adopts the control module to perform charge and discharge management and various data monitoring. When a battery cell blows a valve, the flame retardant component blocks dangerous substances such as gas and combustible particulate matter generated by the battery cell blows a valve outside the space where the control board and the flash memory are located, reducing the possibility of the above dangerous substances directly burning the flash memory or indirectly burning the flash memory by burning the control board, thereby allowing the flash memory to normally record the operating data of the battery pack and retain it after the accident, which is convenient for accident investigation and review.

[0016] In some embodiments of the present application, the battery cell is provided with a safety valve. The battery housing has an opening. A pressure relief space is formed in the battery housing on one side corresponding to the safety valve. The pressure relief space is connected to the opening. And the pressure relief space satisfies the following relationship: Among them, H1 represents the height of the pressure relief space along the eruption direction of the safety valve, N1 represents the number of safety valves in each battery cell, and S represents the surface area of ​​the safety valve.

[0017] In the above embodiment, when each safety valve is erupted, an airflow is formed. By limiting the minimum height of the pressure relief space in the eruption direction of the safety valve so that the height is at least not less than the diameter of the total airflow formed by the eruption of the safety valve of each battery cell, the upward flow of the airflow after the safety valve of each battery cell is blocked and turns, thereby preventing the diameter of the total airflow gathered by the eruption of the safety valve of each battery cell from being reduced, thereby avoiding gas compression and causing explosion, thereby improving the safety of the battery pack.

[0018] In some embodiments of the present application, the cross-sectional area of ​​the pressure relief space in any direction and / or the opening area of ​​the opening satisfies the following relationship: S1≥S×N2, where S1 represents the cross-sectional area of ​​the pressure relief space in any direction and / or the opening area of ​​the opening, and N2 represents the number of all safety valves of all battery cells.

[0019] In the above embodiment, by limiting the minimum cross-sectional area of ​​the pressure relief space in any direction and the minimum opening area, the total airflow formed by the eruption of all safety valves is prevented from reducing in diameter when flowing to the external environment, thereby avoiding gas compression and causing explosion, thereby improving the safety of the battery pack.

[0020] In some embodiments of the present application, the battery pack further comprises a fixing frame. The fixing frame is disposed in the battery housing. One end of the battery cell is plugged into the fixing frame. The safety valve is located at one end of the battery cell plugged into the fixing frame and exposed on the top surface of the fixing frame.

[0021] In the above embodiment, the battery cell is fixedly connected to the battery case through the fixing frame, so as to maintain the battery cell in a stable position in the battery case when the battery cell sprays the valve, thereby avoiding compression of the gas sprayed by the safety valve to avoid explosion, thereby improving the safety of the battery pack. And the safety valve is exposed on the fixing frame so that the safety valve can spray gas smoothly.

[0022] In some embodiments of the present application, the control board and the top surface of the fixing frame are spaced apart. The bottom of the control board, the top surface of the fixing frame and the inner wall of the battery housing jointly define a pressure relief space.

[0023] In the above embodiment, it is usually not convenient to set a hole on the control board to expose the safety valve of the battery cell, so the control board and the fixing frame are spaced apart to facilitate the discharge of the airflow ejected by the safety valve. At the same time, the control board can cooperate with the fixing frame and the battery shell to define a pressure relief space, so that the shape and size of the formed pressure relief space are relatively fixed, which is conducive to the smooth discharge of the gas ejected by the safety valve and improves the safety of the battery pack.

[0024] In some embodiments of the present application, the distance between the bottom of the control board and the top surface of the fixing frame satisfies the following relationship: Wherein, H2 represents the distance between the bottom of the control board and the top surface of the fixing frame, N1 represents the number of safety valves of each battery cell, and S represents the surface area of ​​the safety valve.

[0025] In the above embodiment, the gas ejected by the safety valve flows toward the opening between the control board and the fixing frame. After the safety valve ejects, the airflow flows toward the control board and turns after being stopped by the control board. By limiting the distance between the control board and the fixing frame, the distance is at least not less than the diameter of the total airflow gathered by the ejection of the safety valve of each battery cell, thereby avoiding a reduction in the diameter of the total airflow gathered by the ejection of the safety valve of each battery cell, thereby avoiding gas compression and causing an explosion, thereby improving the safety of the battery pack.

[0026] In some embodiments of the present application, the battery pack further includes an explosion-proof valve. The explosion-proof valve is disposed in the battery housing. The explosion-proof valve is configured to form an exhaust passage between the internal space of the battery housing and the external environment for continuous outflow of gas when a blowout occurs in the safety valve and the shock wave generated by the blowout reaches the explosion-proof valve.

[0027] In the above embodiment, when the battery cell sprays the valve, an explosion-like effect will be generated, forming a shock wave, and when the shock wave reaches the explosion-proof valve, it will impact the explosion-proof valve, so that the explosion-proof valve forms an exhaust channel at the first time when the battery cell sprays the valve, so that the gas sprayed by the safety valve is continuously discharged to the outside of the battery housing through the exhaust channel at the first time. By setting the explosion-proof valve, the gas sprayed by the safety valve is discharged in time, so as to prevent the gas sprayed by the safety valve from accumulating in the battery housing, which is conducive to avoiding thermal runaway of the battery cell, and is conducive to preventing the gas pressure from being too high and damaging the battery housing, reducing the possibility of battery pack explosion, and improving the safety of the battery pack.

[0028] In some embodiments of the present application, when the explosion-proof valve is subjected to a preset pressure, an exhaust passage is formed between the internal space of the battery housing and the external environment. The preset value satisfies the following relationship: P≤K×Q / (ρ×R 2 ). Among them, P represents the preset value, K is a constant, Q represents the energy release of the safety valve spray valve, ρ represents the gas density in the battery shell, and R represents the maximum distance between the explosion-proof valve and the safety valve of the battery cell.

[0029] In the above embodiment, the shock wave overpressure calculation formula can be used to obtain the magnitude of the shock pressure caused by the safety valve of the battery cell at different distances when the safety valve blows, and the preset value is set to be no greater than the shock pressure. Then, when the safety valve blows, the explosion-proof valve will inevitably form an exhaust channel to ensure that the gas generated by the safety valve blows can be discharged smoothly without accumulation, which is beneficial to avoid thermal runaway of the battery cell, avoid battery pack explosion, and improve the safety of the battery pack.

[0030] In some embodiments of the present application, the explosion-proof valve includes a diaphragm. The battery housing has an opening. The opening communicates with the external environment and the internal space of the battery housing. The diaphragm is sealed at the opening. The diaphragm is configured to rupture when the pressure it is subjected to reaches a preset value, so that an exhaust channel is formed at the opening.

[0031] In the above embodiment, by using a diaphragm to seal the opening, when the battery cell is working normally, the diaphragm can separate the internal space of the battery shell from the external environment, thereby protecting the battery cell and other structures in the battery shell from external intrusion; in the case of a battery cell spray valve, the diaphragm can be broken by the shock wave of the battery cell spray valve, thereby establishing a continuous and stable exhaust channel to reduce the possibility of gas accumulation in the battery shell, which is beneficial to avoid thermal runaway of the battery cell, avoid battery pack explosion, and improve the safety of the battery pack.

[0032] In some embodiments of the present application, the explosion-proof valve further comprises a bracket, which is sealed and arranged at a position corresponding to the opening of the battery housing, and the outer peripheral edge of the diaphragm is attached to the bracket.

[0033] In the above embodiment, the diaphragm is sealed and fixed to the battery housing by a bracket, and the bracket helps to eliminate the flatness difference between the opening and the flat state of the diaphragm, so that the diaphragm is packaged to the opening in a flat state. On the one hand, the sealing effect of the diaphragm packaging is improved, and on the other hand, it is easy to stabilize the diaphragm from rupture when it is subjected to a pressure reaching a preset value.

[0034] In some embodiments of the present application, the membrane is a brittle waterproof breathable membrane. Along the air inlet direction of the opening, the membrane is configured to be breathable and waterproof. Along the air outlet direction of the opening, the membrane is configured to be breathable.

[0035] In the above embodiment, the diaphragm is brittle, which is conducive to reducing the toughness of the diaphragm, so as to reduce the pressure of the shock wave required for the diaphragm to rupture, and is conducive to reducing the elasticity of the diaphragm, so that the diaphragm can rupture quickly when impacted. In addition, the diaphragm can allow gas to pass through, so as to balance the air pressure of the internal space of the battery shell with the air pressure of the external environment, so that when the temperature of the battery cell changes, the pressure on both sides of the battery shell is equal to maintain the structural strength of the battery shell. At the same time, the diaphragm can be waterproof to prevent liquid from entering the internal space of the battery shell from the opening, so as to protect the safety of the internal structure of the battery shell such as the battery cell, which is conducive to the stable operation of the battery pack.

[0036] In some embodiments of the present application, the difference between the preparation method of the brittle waterproof breathable membrane and the conventional waterproof breathable membrane is mainly in various ways such as shortening the stretching ratio and / or the initial stretching velocity, lowering the stretching temperature and filling the mechanical property modifying material. The adjustment of the specific process parameters can be determined according to the preset pressure that the membrane needs to withstand.

[0037] An embodiment of the present application provides an energy storage power supply, which includes a housing and a battery pack as described in any of the above embodiments, wherein the battery pack is disposed in the housing.

[0038] In the above embodiment, the energy storage power source adopts the battery pack to store and supply electricity. When a blowout occurs in the battery cell, the flame retardant component blocks dangerous substances such as gas and combustible particulate matter generated by the blowout valve of the battery cell outside the space where the control board and the flash memory are located, thereby reducing the possibility of the above dangerous substances directly burning the flash memory or indirectly burning the flash memory by burning the control board, thereby allowing the flash memory to normally record the operating data of the battery pack and retain it after the accident, thereby facilitating the investigation and review of the accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0040] Figure 1 A schematic diagram of the structure of an energy storage power supply is provided for an embodiment of the present application;

[0041] Figure 2 for Figure 1 A schematic diagram of the structure of an energy storage power supply in which some structures are omitted;

[0042] Figure 3 for Figure 2 Schematic diagram of the structure when the explosion-proof valve is separated from the battery housing;

[0043] Figure 4 for Figure 2 Schematic diagram of the explosion of the battery pack;

[0044] Figure 5 for Figure 4 Exploded diagram of the control module;

[0045] Figure 6 for Figure 4 Schematic diagram of the structure in which the central fixing frame and the battery cell are separated;

[0046] Figure 7 for Figure 2 The schematic cross-sectional view of the AA section of the control module is omitted;

[0047] Figure 8 for Figure 2 Schematic diagram of the cross-section AA in the figure.

[0048] Main component symbols

[0049] 100-explosion-proof valve 200-control module 300-battery pack

[0050] 400-Energy Storage Power Supply

[0051] 10-diaphragm 20-bracket 30-control board

[0052] 40- Flash memory 50- Flame retardant 60- Battery

[0053] 70-battery housing 80-fixing frame 90-housing

[0054] 501-protection space 601-safety valve 701-opening

[0055] 702-pressure relief space 901-pressure relief channel 902-ventilation port DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be 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, rather than all of the embodiments.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0058] In the description of the present application, it should be noted that the terms "inside", "outside", etc. 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 application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0060] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0061] The symbol "~" should be understood as including its endpoint values.

[0062] The mobile energy storage device is equipped with a battery pack, which includes a control module and a battery cell. The control module is used to manage the charging and discharging of the battery cell and monitor various data. In the related technology, once a battery cell blows a valve, the battery cell will produce a large amount of high-temperature gas, and the high-temperature gas will splash onto the control module with combustible particles, causing the control module to melt quickly and unable to continue recording data, which is not conducive to the later investigation and review of the accident.

[0063] Embodiments of the present application provide a control module, a battery pack and an energy storage power supply. The control module is applied to a battery pack. The control module includes a control board, a flash memory and a flame retardant. The control board is configured to be disposed in a battery housing of the battery pack and adjacent to each battery cell in the battery housing. The flash memory is disposed on the control board. The flash memory is configured to record operating data of the battery pack. The flame retardant covers at least one side of the control board facing the safety valve of the battery cell, so that the control board and the flash memory are separated from the space where the battery cells of the battery pack are located.

[0064] The flash memory is installed on the control board and records the operating data of the battery pack, so as to facilitate the investigation and review of the accident after the battery pack has an accident. The flame retardant separates the space where the control board and the flash memory are located from the space where the battery cell is located, thereby blocking the dangerous substances such as gas and combustible particles generated by the battery cell spray valve, improving the safety protection capability of the control module, and reducing the possibility of the above-mentioned dangerous substances directly burning the flash memory or indirectly burning the flash memory by burning the control board, so that the flash memory can normally record the operating data of the battery pack and retain it after the accident, which is convenient for accident investigation and review.

[0065] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0066] See also Figure 1 , Figure 2 and Figure 4 , one embodiment of the present application provides an explosion-proof valve 100, a control module 200, a battery pack 300 and an energy storage power supply 400. The explosion-proof valve 100 is used in the battery pack 300 to release pressure at the initial stage of the valve spraying of the battery cell 60 of the battery pack 300, so as to prevent thermal runaway of the battery cell 60. The control module 200 is used in the battery pack 300 to manage the charge and discharge of the battery pack 300 and monitor various data. The battery pack 300 is used in the energy storage power supply 400, and is used to store and supply electricity to the energy storage power supply 400. The energy storage power supply 400 is a mobile energy storage device, such as a small portable mobile power supply. It is understandable that in other embodiments, the explosion-proof valve 100 can be used in other equipment that needs to avoid explosion. The control module 200 can also be used in other equipment that requires circuit control. The battery pack 300 can also be used in energy storage equipment in other fields.

[0067] See also Figure 1 and Figure 2 In some embodiments, the energy storage power supply 400 includes a battery pack 300. The energy storage power supply 400 uses the battery pack 300 to store and supply electricity. In some embodiments, the energy storage power supply 400 also includes a housing 90. The battery pack 300 is fixed in the housing 90.

[0068] See also Figure 4 and Figure 6 In some embodiments, the battery pack 300 includes a battery cell 60 and a battery housing 70. The battery cell 60 is disposed in the battery housing 70. The battery housing 70 is configured to isolate the battery cell 60 from the external environment. The battery cell 60 is provided with a safety valve 601 to discharge the gas generated by the battery cell 60 when the battery cell 60 works abnormally. In other embodiments, the energy storage power supply 400 may use the battery housing 70 of the battery pack 300 as its device housing.

[0069] See also Figure 4 and Figure 6 In some embodiments, a plurality of battery cells 60 are provided. In some embodiments, each battery cell 60 is provided with a safety valve 601 .

[0070] See also Figure 2 and Figure 3 In some embodiments, the battery pack 300 further includes an explosion-proof valve 100. The explosion-proof valve 100 is disposed in the battery housing 70. The explosion-proof valve 100 is configured to generate a spray valve when the safety valve 601 of the battery cell 60 is sprayed, and when the shock wave generated by the spray valve reaches the explosion-proof valve 100, the explosion-proof valve 100 forms an exhaust channel for continuous outflow of gas between the internal space of the battery housing 70 and the external environment.

[0071] When the battery cell 60 blows the valve, an explosion-like effect will be generated, forming a shock wave, and when the shock wave reaches the explosion-proof valve 100, it will impact the explosion-proof valve 100, and the pressure of the impact on the explosion-proof valve 100 can reach a preset value, so that the explosion-proof valve 100 forms an exhaust channel, so that the gas sprayed from the safety valve 601 is continuously discharged to the outside of the battery housing 70 through the exhaust channel. By providing the explosion-proof valve 100, the gas sprayed from the safety valve 601 is discharged in time, so as to prevent the gas sprayed from the safety valve 601 from accumulating in the battery housing 70, which is conducive to avoiding thermal runaway of the battery cell 60, and is conducive to preventing the gas pressure from being too high and damaging the battery housing 70, reducing the possibility of explosion of the battery pack 300, and improving the safety of the battery pack 300.

[0072] In some embodiments, the pressure on the explosion-proof valve 100 comes from the shock wave generated when the safety valve 601 ejects gas.

[0073] See also Figure 4 , Figures 6 to 8In some embodiments, when the explosion-proof valve 100 is subjected to a preset pressure, an exhaust passage is formed between the internal space of the battery housing 70 and the external environment. The preset pressure value of the explosion-proof valve 100 satisfies the following relationship: P≤K×Q / (ρ×R 2 ). Wherein, P represents a preset value, K is a constant, Q represents the energy release of the safety valve 601, ρ represents the gas density in the battery housing 70, and R represents the maximum distance between the explosion-proof valve 100 and the safety valve 601 of the battery cell 60. It can be understood that in some embodiments, the battery pack 300 works in an atmospheric environment and adopts a corresponding shock wave overpressure calculation formula.

[0074] The shock wave overpressure calculation formula can be used to obtain the magnitude of the shock pressure caused by the safety valve 601 of the battery cell 60 at different distances when the safety valve 601 is sprayed, and the preset value is set to be no greater than the shock pressure. When the safety valve 601 sprays, the explosion-proof valve 100 will inevitably form an exhaust channel to ensure that the gas generated by the safety valve 601 can be discharged smoothly without accumulation, which is beneficial to avoid thermal runaway of the battery cell 60, avoid explosion of the battery pack 300, and improve the safety of the battery pack 300.

[0075] In some embodiments, K is a constant, usually 1. 2 ) is poorly fitted with the actual test results. The value of K can be adaptively adjusted to improve the fitting effect.

[0076] It is understandable that in some embodiments, under extreme conditions, only one safety valve 601 in the battery pack 300 explodes, but the explosion-proof valve still needs to form an exhaust channel at the first time of the explosion. At this time, K×Q / (ρ×R 2 ) is the energy released by a safety valve 601 when a blowout occurs.

[0077] See also Figures 6 to 8 In some embodiments, the explosion-proof valve 100 includes a diaphragm 10. R represents the farthest distance between the diaphragm 10 and the safety valve 601 of the battery cell 60. If there are multiple safety valves 601, R is the distance between the diaphragm 10 and the safety valve 601 farthest from the diaphragm 10.

[0078] See also Figure 2 and Figure 3 In some embodiments, the explosion-proof valve 100 includes a diaphragm 10. The battery housing 70 has an opening 701. The opening 701 connects the external environment and the internal space of the battery housing 70. The diaphragm 10 is sealed at the opening 701. The diaphragm 10 is configured to rupture when the pressure it bears reaches a preset value, so that an exhaust channel is formed at the opening 701.

[0079] By using the diaphragm 10 to seal the opening 701, when the battery cell 60 is working normally, the diaphragm 10 can separate the internal space of the battery shell 70 from the external environment, thereby protecting the battery cell 60, the control module 200, the fixing frame 80 and other structures in the battery shell 70 from external intrusion; and in the case of the battery cell 60 spray valve, the diaphragm 10 can be broken by the shock wave of the battery cell 60 spray valve, thereby establishing a continuous and stable exhaust channel to reduce the possibility of gas accumulation in the battery shell 70, which is beneficial to avoid thermal runaway of the battery cell 60, avoid explosion of the battery pack 300, and improve the safety of the battery pack 300.

[0080] In other embodiments, the explosion-proof valve 100 may include a switch valve and a pressure sensor. When the pressure sensor detects a preset pressure value (that is, the shock wave transmitted to the switch valve for the first time after the battery cell sprays the valve), the switch valve receives the signal sent by the pressure sensor and performs a valve opening action, thereby forming an exhaust channel between the internal space of the battery casing 70 and the external environment.

[0081] Exemplarily, based on the design concept that the explosion-proof valve 100 performs a valve opening action and forms an exhaust channel after being affected by the initial shock wave generated by the battery cell 60, there may be many specific structures of the explosion-proof valve, which will not be described in detail in this embodiment.

[0082] In some embodiments, the battery housing 70 is provided with a stepped surface to accommodate the explosion-proof valve 100 .

[0083] See also Figure 2 and Figure 3 In some embodiments, the explosion-proof valve 100 further includes a bracket 20. The bracket 20 is sealed and disposed at a position of the battery housing 70 corresponding to the opening 701. The outer peripheral edge of the diaphragm 10 is attached to the bracket 20.

[0084] The diaphragm 10 is sealed and fixed to the battery housing 70 by the bracket 20. The bracket 20 helps to eliminate the flatness difference between the opening 701 and the flat diaphragm 10, so that the diaphragm 10 is packaged to the opening 701 in a flat state. On the one hand, the sealing effect of the diaphragm 10 packaging is improved, and on the other hand, it is easy to stabilize the diaphragm 10 from rupture when it is subjected to a pressure reaching a preset value.

[0085] In some embodiments, the bracket 20 is disposed between the diaphragm 10 and the battery housing 70, the diaphragm 10 is attached to the bracket 20 by glue or double-sided tape, and the bracket 20 is attached to the battery housing 70 by glue or double-sided tape. In some embodiments, the diaphragm 10 is disposed between the bracket 20 and the battery housing 70, the diaphragm 10 is attached to the battery housing 70 by glue or double-sided tape, and the bracket 20 is attached to the side of the diaphragm 10 away from the battery housing 70 by glue or double-sided tape.

[0086] See also Figure 3 In some embodiments, the support 20 is an annular structure, which is beneficial for fixing the diaphragm and forming an exhaust channel after the diaphragm 10 is broken. As an exemplary example, the annular shape of the support 20 includes a circular ring, an elliptical ring, a polygonal ring, etc.

[0087] In some embodiments, the diaphragm 10 is a brittle waterproof breathable membrane. Along the air inlet direction of the opening 701, the diaphragm 10 is configured to be breathable and waterproof. Along the air outlet direction of the opening 701, the diaphragm 10 is configured to be breathable. It can be understood that in some embodiments, for ease of description, the direction from the outside of the battery housing 70 to the inside of the battery housing 70 is defined as the air inlet direction of the opening 701, and the direction from the inside of the battery housing 70 to the outside of the battery housing 70 is defined as the air outlet direction of the opening 701.

[0088] The diaphragm 10 is of brittle texture, which is conducive to reducing the toughness of the diaphragm 10, so as to reduce the pressure of the shock wave required for the diaphragm 10 to rupture, and is conducive to reducing the elasticity of the diaphragm 10, so that the diaphragm 10 can rupture quickly when it is impacted. In addition, the diaphragm 10 can allow gas to pass through, so as to balance the air pressure of the internal space of the battery shell 70 with the air pressure of the external environment, so that when the temperature of the battery cell 60 changes, the pressure on both sides of the battery shell 70 is equal to maintain the structural strength of the battery shell 70. At the same time, the diaphragm 10 can be waterproof to prevent liquid from entering the internal space of the battery shell 70 from the opening 701, so as to protect the safety of the internal structure of the battery shell 70 such as the battery cell 60, the control module 200, and the fixing frame 80, which is conducive to the stable operation of the battery pack 300.

[0089] In some embodiments, the difference between the preparation method of the brittle waterproof breathable membrane and the conventional waterproof breathable membrane is mainly in the various methods of shortening the stretching ratio and / or the initial stretching speed, lowering the stretching temperature and filling the mechanical property modifying materials. The adjustment of the specific process parameters can be determined according to the preset pressure that the membrane needs to withstand.

[0090] Exemplarily, the preparation process of the brittle waterproof breathable membrane may be: mixing, baking, pressing, extrusion, pressing, degreasing, multi-pass stretching, standing, post-processing, etc.

[0091] Among them, the multi-pass stretching includes the first stretching, sintering and the second stretching, and the post-processing includes punching the adhesive film, hot pressing the adhesive film and the film material, and cutting.

[0092] Among them, the key point of preparing the brittle waterproof breathable membrane can be to adjust the stretching process parameters in the first stretching or second stretching process. For example, the stretching process of a conventional waterproof breathable membrane is usually a first stretching temperature of 245℃~255℃, an initial stretching speed of 7.5m / min~8m / min, and a stretching ratio of 4 to 5 times. For a brittle waterproof breathable membrane, the first stretching temperature can be 225℃~235℃, the initial stretching speed can be 6.5m / min~7m / min and / or the stretching ratio can be 3 to 4 times, etc.

[0093] In some embodiments, the waterproof rating of the membrane 10 at least meets IP54.

[0094] In some embodiments, the diaphragm 10 is a poly(p-phenylene ether sulfone) film. The diaphragm 10 is made of poly(p-phenylene ether sulfone), so that the diaphragm 10 can stably rupture when subjected to a pressure reaching a preset value, thereby facilitating the stable formation of an exhaust channel when the battery cell 60 sprays a valve.

[0095] It can be understood that in some embodiments, the main component of the diaphragm 10 is poly(p-phenylene ether sulfone), which is a polymer material.

[0096] In some embodiments, the thickness of the membrane 10 satisfies the following relationship: 0.10 mm≤D≤0.20 mm, where D represents the thickness of the membrane 10 .

[0097] By configuring the thickness of the diaphragm 10 to be between 0.10 mm and 0.20 mm, it is advantageous for the diaphragm 10 to be stably ruptured when subjected to a pressure reaching a preset value.

[0098] In some embodiments, performance tests are performed on diaphragms 10 of different thicknesses. The experimental conditions are as follows: the battery shell 70 is made of plastic, a fixing frame 80 is provided inside the battery shell 70, and each battery cell 60 is fixed in the battery shell 70 by the fixing frame 80. Each battery cell 70 is selected as a 40135 type battery cell, and an explosion-proof valve 100 is provided on the surface of the battery shell 70. Among them, the distance between the explosion-proof valve 100 and the safety valve 601 of the farthest battery cell 60 among the battery cells 60 is 0.1m, and the initial valve spray energy of the safety valve 601 of the battery cell 60 is 50KJ~60KJ, K is a constant 1, and ρ is 1.29kg / m 3 , an exhaust passage should be formed at the explosion-proof valve 100 when the pressure is about 4MPa.

[0099] Table 1 is a comparative experimental record table of membranes 10 of different thicknesses under the above experimental conditions in this application:

[0100]

[0101]

[0102] See also Figure 7 In some embodiments, a pressure relief space 702 is formed in the battery housing 70 along one side of the ejection direction of the safety valve 601 . The pressure relief space 702 is connected to the opening 701 .

[0103] By providing the pressure relief space 702, it is helpful to prevent gas accumulation and explosion after the safety valve 601 is opened.

[0104] See also Figure 7 , the pressure relief space 702 satisfies the following relationship: Wherein, H1 represents the height of the pressure relief space 702 along the eruption direction of the safety valve 601, N1 represents the number of safety valves 601 of each battery cell 60, and S represents the surface area of ​​the safety valve 601. It can be understood that in some embodiments, the pressure relief space 702 is located on the eruption direction side of the safety valve 601.

[0105] When each safety valve 601 is erupted, an airflow is formed. When multiple safety valves 601 are erupted, the multiple airflows can be regarded as flowing by an airflow that is equal to the sum of the cross-sectional areas of the airflows erupted by the multiple safety valves 601. By limiting the minimum height of the pressure relief space 702 in the eruption direction of the safety valve 601, so that the height is at least not less than the diameter of the total airflow formed by the eruption of the safety valve 601 of each battery cell 60, after the safety valve 601 of each battery cell 60 is erupted, the upward flow of the airflow is blocked and turns, so as to avoid the reduction of the diameter of the total airflow gathered by the eruption of the safety valve 601 of each battery cell 60, so as to avoid gas compression and explosion, thereby improving the safety of the battery pack 300.

[0106] It is understood that in some embodiments, when the models of the multiple battery cells 60 provided in the same battery pack 300 are different, so that the number of safety valves 601 of different battery cells 60 is different, the pressure relief space 702 H1 should not be less than the corresponding safety valves 601 of different battery cells 60. The maximum value in .

[0107] It is understood that in some embodiments, the pressure relief space 702 satisfies In the relationship of , the number of the safety valves 601 of each battery cell 60 represented by N1 is the number of the safety valves 601 of each battery cell 60 leading to the pressure relief space 702 .

[0108] For example, when the total number of safety valves 601 provided on a certain battery cell 60 is 3, of which 2 are provided at the upper end and 1 is provided at the lower end; the safety valve 601 at the upper end of the battery cell 60 leads to the pressure relief space 702 located at the upper end of the battery cell 60, then N1 satisfies the formula of H1 of the pressure relief space 702 corresponding to the upper end of the battery cell 60 as 2; the safety valve 601 at the lower end of the battery cell 60 leads to the pressure relief space 702 located at the lower end of the battery cell 60, then N1 satisfies the formula of H1 of the pressure relief space 702 corresponding to the lower end of the battery cell 60 as 1.

[0109] For another example, when the total number of safety valves 601 provided on a certain battery cell 60 is 3, of which 2 are provided at the upper end and 1 is provided at the lower end; the safety valve 601 at the upper end of the battery cell 60 leads to the pressure relief space 702 located at the upper end of the battery cell 60, and the safety valve 601 at the lower end of the battery cell 60 also leads to the pressure relief space 702 located at the upper end of the battery cell 60 through certain structures, then N1 in the formula satisfied by H1 of the pressure relief space 702 corresponding to the upper end of the battery cell 60 is 3.

[0110] In some embodiments, the performance of the pressure relief space is tested at different H1 heights. The experimental conditions are as follows: the battery shell 70 is made of plastic, a fixing frame 80 is provided inside the battery shell 70, and each battery cell 60 is fixed in the battery shell 70 by the fixing frame 80. Each battery cell 70 is selected as a 40135 type battery cell, and an explosion-proof valve 100 is provided on the surface of the battery shell 70. Among them, the distance between the explosion-proof valve 100 and the safety valve 601 of the farthest battery cell 60 among the battery cells 60 is 0.1m, and the initial valve spray energy of the safety valve 601 of the battery cell 60 is 50KJ~60KJ, K is a constant 1, and ρ is 1.29kg / m 3 , an exhaust passage should be formed at the explosion-proof valve 100 when the pressure is about 4MPa.

[0111] Table 2 shows the explosion-proof results of the battery pack 300 when the height of the pressure relief space 702 along the eruption direction of the safety valve 601 is different under the above experimental conditions in this application:

[0112]

[0113] See also Figure 6 and Figure 7 In some embodiments, the cross-sectional area of ​​the pressure relief space 702 in any direction and / or the opening area of ​​the opening 701 satisfies the following relationship: S1≥S×N2. Wherein, S1 represents the cross-sectional area of ​​the pressure relief space 702 in any direction and / or the opening area of ​​the opening 701, S represents the surface area of ​​the safety valve 601, and N2 represents the number of all safety valves 601 of all battery cells 60.

[0114] By limiting the minimum cross-sectional area of ​​the pressure relief space 702 in any direction and the minimum opening area of ​​the opening 701, the total airflow formed by the eruption of all safety valves 601 is prevented from reducing in diameter when flowing to the external environment, thereby avoiding gas compression and causing explosion, thereby improving the safety of the battery pack 300.

[0115] It can be understood that in some embodiments, the pressure relief space 702 satisfies the relationship S1≥S×N2, and the number of all safety valves 601 of all battery cells 60 represented by N2 is the number of all safety valves 601 of all battery cells 60 leading to the pressure relief space 702.

[0116] For example, when the number of battery cells 60 of a certain model in the battery pack 300 is 30, the total number of safety valves 601 set for each battery cell 60 of this model is 3, of which 2 are set at the upper end and 1 is set at the lower end; the safety valves 601 at the upper ends of multiple battery cells 60 lead to the pressure relief space 702 located at the upper end of the battery cell 60, and the formula satisfied by S1 of the pressure relief space 702 corresponding to the upper end of the battery cell 60 is 60; the safety valves 601 at the lower ends of multiple battery cells 60 lead to the pressure relief space 702 located at the lower end of the battery cell 60, and the formula satisfied by S1 of the pressure relief space 702 corresponding to the lower end of the battery cell 60 is 30.

[0117] For another example, when the number of battery cells 60 of a certain model in the battery pack 300 is 30, the total number of safety valves 601 set for each battery cell 60 of this model is 3, of which 2 are set at the upper end and 1 is set at the lower end; the safety valves 601 at the upper ends of multiple battery cells 60 lead to the pressure relief space 702 located at the upper ends of the battery cells 60, and the safety valves 601 at the lower ends of multiple battery cells 60 also lead to the pressure relief space 702 located at the upper ends of the battery cells 60 through certain structures. Then, N2 in the formula satisfied by S1 of the pressure relief space 702 corresponding to the upper end of the battery cell 60 is 90.

[0118] See also Figure 4 and Figure 6 In some embodiments, the battery pack 300 further includes a fixing frame 80. The fixing frame 80 is disposed in the battery housing 70. One end of the battery cell 60 is plugged into the fixing frame 80. And the safety valve 601 is located at the end of the battery cell 60 plugged into the fixing frame 80, and is exposed on the top surface of the fixing frame 80. It can be understood that in some embodiments, the top surface of the fixing frame 80 is the side away from the battery cell 60, and the orientation represented by the "top surface" in the top surface of the fixing frame 80 is based on the direction shown in the figure. When the corresponding safety valve 601 is set upward, the top surface of the fixing frame 80 is also set upward.

[0119] The battery cell 60 is fixedly connected to the battery housing 70 via the fixing frame 80, so as to maintain the battery cell 60 in a stable position in the battery housing 70 when the battery cell 60 is ejected, thereby avoiding compression of the gas ejected from the safety valve 601 to avoid explosion, thereby improving the safety of the battery pack 300. The safety valve 601 is exposed on the fixing frame 80, so that the safety valve 601 can eject gas smoothly.

[0120] See also Figure 4 and Figure 5 In some embodiments, the battery pack 300 further includes a control module 200. The control module 200 includes a control board 30. The control board 30 manages charging and discharging and monitors various data. The control board 30 is configured to be disposed in the battery housing 70 of the battery pack 300 and adjacent to each battery cell in the battery housing.

[0121] In some embodiments, the control board 30 is a BMS (Battery Management System) board, and the safety valve 601 of the battery cell 60 faces the BMS board. In other embodiments, the control board includes a BMS board and a PSDR (Power Supply Distribution) board, and the BMS board is arranged on the side of the battery cell 60, and the safety valve 601 of the battery cell 60 faces the PSDR board. In other embodiments, the control board 30 can also be a board in which the BMS board and the PSDR board are integrated.

[0122] See also Figure 4 , Figure 5 and Figure 8 In some embodiments, the control board 30 is disposed in the battery housing 70 and is spaced apart from the top surface of the fixing frame 80. The bottom of the control board 30, the top surface of the fixing frame 80, and the inner wall of the battery housing 70 together define a pressure relief space 702. It can be understood that in some embodiments, the bottom of the control board 30 is the side facing the fixing frame 80, and the orientation represented by the "bottom" in the bottom of the control board 30 is based on the illustrated direction. When the corresponding safety valve 601 is set upward, the bottom of the control board 30 is set downward.

[0123] The charge and discharge actions of the battery cell 60 are controlled by setting a control board 30, but it is usually not convenient to set a hole in the control board 30 to expose the safety valve 601 of the battery cell 60, so the control board 30 and the fixing frame 80 are spaced apart to facilitate the discharge of the airflow ejected by the safety valve 601. At the same time, the control board 30 can cooperate with the fixing frame 80 and the battery shell to define a pressure relief space 702, so that the shape and size of the formed pressure relief space 702 are relatively fixed, which is conducive to the smooth discharge of the gas ejected by the safety valve 601 and improves the safety of the battery pack 300.

[0124] See also Figure 8In some embodiments, the distance between the bottom of the control board 30 and the top surface of the fixing frame 80 satisfies the following relationship: Wherein, H2 represents the distance between the bottom of the control board 30 and the top surface of the fixing frame 80 , N1 represents the number of safety valves 601 of each battery cell 60 , and S represents the surface area of ​​the safety valve 601 .

[0125] The gas ejected from the safety valve 601 flows toward the opening 701 between the control board 30 and the fixing frame 80. After the safety valve 601 is ejected, the airflow flows toward the control board 30, and turns after being stopped by the control board 30. By limiting the distance between the control board 30 and the fixing frame 80, the distance is at least not less than the diameter of the total airflow gathered by the ejection of the safety valve 601 of each battery cell 60, thereby avoiding a reduction in the diameter of the total airflow gathered by the ejection of the safety valve 601 of each battery cell 60, thereby avoiding gas compression and causing an explosion, thereby improving the safety of the battery pack 300.

[0126] It is understood that in some embodiments, the pressure relief space 702 satisfies In the relationship of , the number of the safety valves 601 of each battery cell 60 represented by N1 is the number of the safety valves 601 of each battery cell 60 leading to the pressure relief space 702 .

[0127] For example, when the total number of safety valves 601 provided on a certain battery cell 60 is 3, of which 2 are provided at the upper end and 1 is provided at the lower end; the safety valve 601 at the upper end of the battery cell 60 leads to the pressure relief space 702 between the upper end of the battery cell 60 and the control board 30, then the formula satisfied by H2 of the pressure relief space 702 corresponding to the upper end of the battery cell 60 is 2; the safety valve 601 at the lower end of the battery cell 60 leads to the pressure relief space 702 between the lower end of the battery cell 60 and the control board 30 (if the control board 30 is provided at both ends of the battery cell 60, if only one end is provided with the control board 30, then only the case of the end corresponding to the control board 30 is considered), then the formula satisfied by H2 of the pressure relief space 702 corresponding to the lower end of the battery cell 60 is 1.

[0128] For another example, when the total number of safety valves 601 provided on a certain battery cell 60 is 3, of which 2 are provided at the upper end and 1 is provided at the lower end; the safety valve 601 at the upper end of the battery cell 60 leads to the pressure relief space 702 between the upper end of the battery cell 60 and the control board 30, and the safety valve 601 at the lower end of the battery cell 60 also leads to the pressure relief space 702 between the upper end of the battery cell 60 and the control board 30 through certain structures, then N1 in the formula satisfied by H2 of the pressure relief space 702 corresponding to the upper end of the battery cell 60 is 3.

[0129] In some embodiments, the safety valve 601 includes a first safety valve and a second safety valve (not shown). The first safety valve and the second safety valve are provided at both ends of the battery cell 60, respectively. The pressure relief space 702 includes a first pressure relief space and a second pressure relief space (not shown). In the battery housing 70, a first pressure relief space is formed on one side along the spray direction of the first safety valve, and a second pressure relief space is formed on one side along the spray valve direction of the second safety valve. There are two explosion-proof valves 100. The two explosion-proof valves 100 are respectively provided corresponding to the first pressure relief space and the second pressure relief space.

[0130] Both the first safety valve and the second safety valve can spray gas. The first pressure relief space is provided to allow the gas sprayed by the first safety valve to flow toward the opening 701, and the second pressure relief space is provided to allow the gas sprayed by the second safety valve to flow toward the opening 701. This facilitates the gas generated by the spray valve of the battery cell 60 to be discharged smoothly to the external environment, thereby improving the safety of the battery pack 300.

[0131] In some embodiments, in the formulas satisfied by H1 and S1 of the first pressure relief space, the relevant values ​​of the safety valve 601 involved are all relevant values ​​of the first safety valve. In the formulas satisfied by H1 and S1 of the second pressure relief space, the relevant values ​​of the safety valve 601 involved are all relevant values ​​of the second safety valve.

[0132] It can be understood that in some embodiments, when a plurality of battery cells 60 are provided, the first safety valves of the plurality of battery cells 60 are all oriented toward the same side, and the second safety valves of the plurality of battery cells 60 are all oriented toward the same side.

[0133] It is understandable that in other embodiments, a plurality of explosion-proof valves 100 may be disposed on the side where the first pressure relief space is located, and a plurality of explosion-proof valves 100 may be disposed on the side where the second pressure relief space is located.

[0134] See also Figure 2 and Figure 4 In some embodiments, the battery housing 70 is configured to seal and isolate the battery cell 60 from the external environment.

[0135] The battery case 70 seals the battery cell 60 from the external environment, thereby preventing liquid from invading the battery case 70 and affecting the operation of the battery, thereby improving the safety of the battery pack 300 .

[0136] See also Figure 2 and Figure 8In some embodiments, a pressure relief channel 901 is formed between the outer wall of the battery housing 70 and the inner wall of the outer shell 90. The explosion-proof valve 100 of the battery pack 300 is connected to the pressure relief channel 901. The outer shell 90 is provided with at least one vent 902. The pressure relief channel 901 is connected to the vent 902. (Two product forms of energy storage power supply, one with inverter, the vent is the opening where the fan is set, and the other is a home appliance package, the vent is the gap of the shell)

[0137] By setting a pressure relief channel 901 between the outer wall and the inner wall of the battery shell 70, after the explosion-proof valve 100 forms an exhaust channel, the gas ejected from the safety valve 601 in the battery shell 70 can be guided to flow to the vent 902, so as to be discharged to the outside of the shell 90 through the vent 902, thereby helping to avoid gas accumulation inside the energy storage power supply 400, avoiding thermal runaway of the battery cell 60 and avoiding explosion, thereby improving the safety of the energy storage power supply 400.

[0138] In some embodiments, the energy storage power supply 400 includes an inverter module to output AC power to the outside. The energy storage power supply 400 is provided with a fan to dissipate heat from the inverter module. Then the channel connecting the fan and the external environment can be used as a vent 902. In some embodiments, the energy storage power supply 400 does not include an inverter module, and the energy storage power supply 400 can only output DC power to the outside. Then the assembly gap of the housing 90 of the energy storage power supply 400 can be used as a vent 902.

[0139] See also Figure 2 and Figure 4 In some embodiments, the battery housing 70 of the battery pack 300 is in the shape of a cover and is sealed with the bottom of the outer shell 90 .

[0140] The cover-shaped battery casing 70 is easy to connect with the outer shell 90, thereby improving the sealing effect, which is beneficial to improving the protection effect of the internal structure of the battery casing 70 such as the battery cell 60, the control module 200, and the fixing frame 80.

[0141] See also Figure 5 In some embodiments, the control module 200 further includes a flash memory 40. The flash memory 40 is disposed on the control board 30. The flash memory 40 is configured to record the operating data of the battery pack 300. By providing the flash memory 40, it is convenient to investigate and review the accident after the battery pack 300 has an accident.

[0142] In some embodiments, the flash memory 40 may be a flash chip. In some embodiments, the operating data of the battery pack 300 recorded in the flash memory 40 includes voltage conversion data, current change data, temperature change data, power balancing data, and the like.

[0143] See also Figure 4 and Figure 5In some embodiments, the control module 200 further includes a flame retardant 50. The flame retardant 50 covers at least one side of the control board 30 facing the safety valve 601 of the battery cell 60, so that the control board 30 and the flash memory 40 are separated from the space where the battery cell 60 of the battery pack 300 is located.

[0144] The flame retardant component 50 separates the space where the control board 30 and the flash memory 40 are located from the space where the battery cell 60 is located, thereby forming a barrier to dangerous substances such as gas and combustible particulate matter generated by the spray valve of the battery cell 60, improving the safety protection capability of the control module 200, and reducing the possibility of the above-mentioned dangerous substances directly burning the flash memory 40 or indirectly burning the flash memory 40 by burning the control board 30, so that the flash memory 40 can normally record the operating data of the battery pack 300 and retain it after an accident occurs, which is convenient for accident investigation and review.

[0145] See also Figure 8 It can be understood that in some embodiments, when the control board 30 and the battery cell 60 are separated by the flame retardant 50, H2 in the aforementioned embodiment represents the distance between the bottom of the flame retardant 50 and the top surface of the fixing frame 80.

[0146] See also Figure 4 , Figure 5 and Figure 8 In some embodiments, a protective space 501 is provided in the flame retardant 50 . The control board 30 and the flash memory 40 are both located in the protective space 501 .

[0147] The flame retardant 50 separates the protection space 501 from other spaces in the battery housing 70, so that the control board 30 and the flash memory 40 can be protected from the burning of dangerous substances such as gas and combustible particles in the protection space 501. The flame retardant 50 can fully protect the control board 30 and the flash memory 40, while maintaining the safety protection capability of the control module 200, making the installation position of the control module 200 in the battery housing 70 more diverse.

[0148] See also Figure 8 It can be understood that in some embodiments, when the control board 30 and the flash memory 40 are both disposed in the protective space 501, the flame retardant 50 can be attached and wrapped around the peripheral side of the control board 30 and the flash memory 40 to serve as a component of an integrated structure; the flame retardant 50 can also be provided with an openable and closable entrance and exit, and the control board 30 and the flash memory 40 can be detachably assembled in the protective space 501. The control board 30 can be connected to the battery housing 70 through the flame retardant 50.

[0149] In some embodiments, a flash memory 40 is disposed on one of the two opposite sides of the control board 30 , and a flame retardant 50 (not shown) is disposed on the other side of the control board 30 . The flame retardant 50 abuts against the inner wall of the battery housing 70 .

[0150] The flame retardant 50 is in contact with the inner wall of the battery housing 70, so that dangerous substances such as gas and combustible particles cannot spread into the space where the control board 30 is located, thereby protecting the control board 30 and the flash memory 40 from being burned by dangerous substances. The flame retardant 50 does not need to cover the entire control board 30, which is conducive to reducing production difficulty and saving production costs.

[0151] It can be understood that in some embodiments, when the flame retardant component 50 and the flash memory 40 are respectively located on both sides of the control board 30, the flame retardant component 50 can be attached to the side of the control board 30 away from the flash memory 40 to serve as a component of an integrated structure; the flame retardant component 50 can also be set separately from the control board 30.

[0152] In some embodiments, the material of the flame retardant 50 includes at least one of mica, glass fiber, ceramic silica gel, and nano-insulation board.

[0153] Materials such as mica, glass fiber, ceramic silicone, and nano-insulation boards, on the one hand, have high structural strength or can be converted to high structural strength at high temperatures while being fireproof, thereby withstanding the impact caused by the eruption of dangerous substances such as gas and combustible particles; on the other hand, they have poor thermal conductivity, thereby blocking the high temperature generated by the battery cell 60 spray valve.

[0154] In some embodiments, mica, glass fiber, ceramic silicone, nano thermal insulation board, etc. can be separately made into the flame retardant 50. As an illustrative example, the flame retardant 50 can be ceramic silicone only.

[0155] In some embodiments, two, three or more of mica, glass fiber, ceramic silica gel, nano thermal insulation board, etc. can be layered and combined to form the flame retardant 50. As an illustrative example, the flame retardant 50 can be a layer of mica, a layer of glass fiber and a layer of nano thermal insulation board.

[0156] In some embodiments, two, three or more of mica, glass fiber, ceramic silica gel, nano thermal insulation board, etc. can be mixed together to form the flame retardant 50. As an illustrative example, the flame retardant 50 can be a layer of mica and glass fiber mixed together.

[0157] It is understood that in some embodiments, mica is an aluminum silicate of metals such as potassium, aluminum, magnesium, iron, and lithium, all of which are layered structures and monoclinic crystals. The crystals are pseudo-hexagonal flakes or plates, and occasionally columnar.

[0158] It can be understood that in some embodiments, glass fiber is an inorganic non-metallic material, which is usually made from six minerals, namely pyrophyllite, quartz sand, limestone, dolomite, colemanite and magnesia stone, through high-temperature melting, wire drawing, winding, weaving and other processes.

[0159] It is understood that in some embodiments, ceramicized silica gel is a rubber material with inorganic fillers. When exposed to flames, it can be ceramicized at a temperature of 350°C to 800°C or above, sintered into a porous self-supporting ceramic body, and can maintain structural integrity in a high temperature flame of 650°C to 1000°C for a certain period of time.

[0160] It can be understood that in some embodiments, the nano-scale inorganic refractory powder of the nano-insulation board has a huge specific surface area, and the contact between the nanoparticles is an extremely small point contact. The thermal resistance of the point contact is very large, which makes the conductive heat transfer effect of the material very small; a large number of nano-scale pores are formed between the nanoparticles, locking the air molecules within the nano-scale pores, so that the tiny convective heat transfer effect between the static air molecules disappears.

[0161] See also Figure 5 , Figure 6 and Figure 8 In some embodiments, along the ejection direction of the safety valve 601 , the projection of the flash memory 40 does not overlap with the projection of the safety valve 601 .

[0162] The flash memory 40 and the safety valve 601 are staggered, so as to avoid the impact generated by the eruption of the safety valve 601 directly impacting the location of the flash memory 40 and causing damage to the flash memory 40, thereby improving the safety of the flash memory 40.

[0163] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A control module, applied to a battery pack, characterized in that: include: A control board is configured to be disposed in a battery housing of the battery pack and adjacent to each battery cell in the battery housing; A flash memory, provided on the control board, the flash memory being configured to record operating data of the battery pack; A flame retardant component, wherein the flame retardant component at least covers one side of the control board facing the safety valve of the battery cell, so that the control board and the flash memory are separated from the space where the battery cell of the battery pack is located.

2. The control module according to claim 1, characterized in that: A protection space is provided in the flame retardant component, and the control board and the flash memory are both located in the protection space.

3. The control module according to claim 1, characterized in that: The flash memory is arranged on one of the two opposite sides of the control board, and the flame retardant is arranged on the other side, and the flame retardant is in contact with the inner wall of the battery housing.

4. The control module according to any one of claims 1 to 3, characterized in that: The material of the flame retardant comprises at least one of mica, glass fiber, ceramic silica gel and nano thermal insulation board.

5. The control module according to any one of claims 1 to 3, characterized in that: Along the ejection direction of the safety valve of the battery cell, the projection of the flash memory does not overlap with the projection of the safety valve.

6. A battery pack, characterized in that: It comprises a battery cell, a battery shell and a control module as described in any one of claims 1 to 5, wherein the battery cell is arranged in the battery shell, the control board is arranged in the battery shell, and the flame retardant component separates the space where the control board and the flash memory are located in the battery shell from the space where the battery cell is located.

7. The battery pack according to claim 6, characterized in that: The battery cell is provided with a safety valve, the battery housing has an opening, and a pressure relief space is formed in the battery housing on one side corresponding to the safety valve, the pressure relief space is connected to the opening, and the pressure relief space satisfies the following relationship: H1 ≥ 2 × √ N1 × S / π; Wherein, H1 represents the height of the pressure relief space along the eruption direction of the safety valve, N1 represents the number of the safety valves of each of the battery cells, and S represents the surface area of ​​the safety valve.

8. The battery pack according to claim 7, characterized in that: The cross-sectional area of ​​the pressure relief space in any direction and / or the opening area of ​​the opening satisfies the following relationship: S1 ≥ S × N2; Wherein, S1 represents the cross-sectional area of ​​the pressure relief space in any direction and / or the opening area of ​​the opening, and N2 represents the number of all the safety valves of all the battery cells.

9. The battery pack according to claim 8, characterized in that: The battery pack also includes a fixing frame, which is arranged in the battery shell, one end of the battery cell is inserted into the fixing frame, and the safety valve is located at the end of the battery cell inserted in the fixing frame and exposed on the top surface of the fixing frame.

10. The battery pack according to claim 9, characterized in that: The control board and the top surface of the fixing frame are spaced apart, and the bottom of the control board, the top surface of the fixing frame and the inner wall of the battery housing jointly define the pressure relief space.

11. The battery pack according to claim 10, characterized in that: The distance between the bottom of the control panel and the top surface of the fixing frame satisfies the following relationship: H2 ≥ 2 × √N1 × S / π; Wherein, H2 represents the distance between the bottom of the control board and the top surface of the fixing frame, N1 represents the number of the safety valves of each of the battery cells, and S represents the surface area of ​​the safety valve.

12. The battery pack according to any one of claims 7 to 11, characterized in that: The battery pack also includes an explosion-proof valve, which is arranged in the battery shell. The explosion-proof valve is constructed so that when a blowout occurs in the safety valve and the shock wave generated by the blowout reaches the explosion-proof valve, the explosion-proof valve forms an exhaust channel for continuous outflow of gas between the internal space of the battery shell and the external environment.

13. The battery pack according to claim 12, characterized in that: When the explosion-proof valve is subjected to a preset pressure, the exhaust passage is formed between the internal space of the battery housing and the external environment, and the preset pressure satisfies the following relationship: P≤K×Q / (ρ×R 2 ); Among them, P represents the preset value, K is a constant, Q represents the energy release of the safety valve spray valve, ρ represents the gas density in the battery shell, and R represents the maximum distance between the explosion-proof valve and the safety valve of the battery cell.

14. The battery pack according to claim 12, characterized in that: The explosion-proof valve includes a diaphragm, the battery housing has an opening, the opening connects the external environment and the internal space of the battery housing, the diaphragm is sealed in the opening, and the diaphragm is configured to rupture when the pressure it is subjected to reaches a preset value, so that the exhaust channel is formed at the opening.

15. The battery pack according to claim 14, characterized in that: The explosion-proof valve further comprises a bracket, which is sealingly arranged at a position of the battery housing corresponding to the opening, and the outer peripheral edge of the diaphragm is attached to the bracket.

16. The battery pack according to claim 14, characterized in that: The membrane is a brittle waterproof and breathable membrane. Along the air inlet direction of the opening, the membrane is breathable and waterproof. Along the air outlet direction of the opening, the membrane is breathable.

17. An energy storage power supply, characterized in that: The invention comprises a housing and a battery pack according to any one of claims 6 to 16, wherein the battery pack is arranged in the housing.

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