A multi-string high-voltage energy storage lithium battery management system

Abstract

The present invention discloses a multi-string high-voltage energy storage lithium battery management system, which belongs to the field of new energy. A multi-string high-voltage energy storage lithium battery management system, comprising a plurality of battery packs arranged in sequence; the battery pack comprises an outer shell, lithium batteries arranged longitudinally in the outer shell, and a ventilation mechanism located on the left and right sides of the lithium battery; the ventilation mechanism comprises a ventilation shell, and a plurality of sliding shells sliding in the ventilation shell in a horizontal direction; the sliding shell is evenly provided with air outlets facing the lithium battery; the sliding shell and the lithium battery are connected together by a rubber strip; the rubber strip will melt when encountering high temperature. A fan for providing airflow into the ventilation shell and a fire extinguisher bottle for providing carbon dioxide into the ventilation shell are installed in the outer shell; a control panel is installed in the outer shell. In this scheme, by setting a ventilation shell and a sliding shell, the airflow generated by the fan can dissipate heat to the lithium battery through the ventilation shell, and the carbon dioxide generated by the fire extinguisher bottle can also extinguish the lithium battery through the ventilation shell.

Description

Technical Field

[0001] The present invention belongs to the field of new energy, and more specifically, relates to a multi-string high-voltage energy storage lithium battery management system. Background Art

[0002] In order to ensure the optimal use of energy, manage the charging and discharging process, and evaluate the charge state, health state and other status parameters of each battery cell, the high-voltage energy storage lithium battery management system monitors and controls all processes related to the overall performance and life of the battery. At the same time, when unexpected situations occur in the lithium battery, it will be handled in time to avoid danger.

[0003] The voltage inside a high-voltage energy storage lithium battery can reach 1500V. During use, a lot of heat will be generated, which requires heat dissipation. However, lithium batteries will inevitably spontaneously combust, and it is necessary to extinguish the fire after spontaneous combustion. However, in most devices today, heat dissipation and fire extinguishing are two different mechanisms, which takes up more space. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-string high-voltage energy storage lithium battery management system, which can realize heat dissipation and fire extinguishing concentrated on the same module, saving internal space.

[0005] A multi-string high-voltage energy storage lithium battery management system of the present invention comprises a plurality of battery packs arranged in sequence; the battery pack comprises an outer shell, lithium batteries arranged longitudinally in the outer shell, and a ventilation mechanism located on the left and right sides of the lithium batteries; the ventilation mechanism comprises a ventilation shell, and a plurality of sliding shells sliding in the ventilation shell along the horizontal direction; the sliding shell is evenly provided with air outlets facing the lithium batteries; the sliding shell and the lithium batteries are connected together by a rubber strip; the rubber strip will melt when encountering high temperature.

[0006] A fan for providing airflow into the ventilation shell and a fire extinguisher bottle for providing carbon dioxide into the ventilation shell are installed in the shell; a control panel is installed in the shell.

[0007] As a further improvement of the present invention, a BMU module is provided in the control panel, and the BMU modules in several battery packs are connected to a BCU module; and several BCU modules are connected to an IMU module.

[0008] As a further improvement of the present invention, a baffle for closing the air outlet is longitudinally slidably connected inside the sliding shell; and connecting holes that can face the air outlet are evenly arranged on the baffle.

[0009] As a further improvement of the present invention, an airbag is arranged between the lower end of the baffle and the sliding shell; the airbags are interconnected; when the airbag is inflated, the baffle is located at the upper limit position, and the air outlet is directly opposite to the connecting hole; a blade is arranged in the vent shell at a position directly opposite to each airbag; when the rubber strip breaks, the blade pierces the airbag, each airbag shrinks, the baffle is located at the lower limit position, and the baffle blocks the air outlet.

[0010] As a further improvement of the present invention, tension springs are respectively arranged between the vent shell and each sliding shell to drive the sliding shell to move away from the lithium battery; an inclined lifting slope is arranged at the end of the baffle away from the lithium battery; a lifting stop block is arranged at a position of the vent shell opposite to the lifting slope; when the rubber strip breaks, the tension spring drives the sliding shell to move, and the lifting stop block is against the lifting slope, so that the baffle is located at the upper limit position.

[0011] As a further improvement of the present invention, the fire extinguisher bottle is provided with a valve; the valve is connected to a latch for controlling the opening of the valve; a piston shell connected to each airbag is fixedly connected inside the outer shell; a piston body fixedly connected to the latch is sealingly and slidably connected inside the piston shell; a latch tension spring is arranged between the piston body and the piston shell; when the airbag contracts, the latch separates from the valve and the valve opens.

[0012] As a further improvement of the present invention, longitudinally arranged heat dissipation ports are respectively provided at the front and rear ends of the shell; a closing plate for closing the heat dissipation ports is longitudinally slidably connected inside the shell; a vent capable of communicating with the heat dissipation ports is provided on the closing plate; and a control mechanism for controlling the movement of the closing plate is provided inside the shell.

[0013] As a further improvement of the present invention, the control mechanism includes a movable plate sliding in a horizontal direction, a force storage spring driving the movable plate to move, and a positioning clamping head limiting the movement of the movable plate; a limiting stop block is arranged on the movable plate; and a closing clamping head engaged with the limiting stop block is arranged on the closing plate.

[0014] As a further improvement of the present invention, a positioning column clamped with a closed clamp is provided on the movable plate; heat conduction pipes connected to each other are provided at positions corresponding to the respective vents on the closed plate; a ventilation pipe connected to the heat conduction pipe is fixedly connected inside the outer shell; an air chamber fixedly connected to the positioning clamp is sealingly and slidably connected on the ventilation pipe.

[0015] As a further improvement of the present invention, a plug for power transmission is plugged into the control panel; a plurality of tooth grooves are arranged on both sides of the plug; a gear meshing with the tooth groove is rotatably connected in the shell; and a rack is arranged on the movable plate for driving the gear to rotate and thereby separate the plug from the control panel.

[0016] Compared with the prior art, the beneficial effect of the present invention is that: by setting a ventilation shell and a sliding shell, the airflow generated by the fan can dissipate the heat of the lithium battery through the ventilation shell, and the carbon dioxide generated by the fire extinguisher bottle can also extinguish the lithium battery through the ventilation shell, thereby concentrating the heat dissipation and fire extinguishing on the ventilation shell, saving space.

[0017] This solution sets a baffle so that after the lithium battery spontaneously combusts, the baffle that is not directly facing the flame blocks the vent, allowing carbon dioxide to be concentratedly sprayed at the place of spontaneous combustion, thereby improving the utilization rate of carbon dioxide.

[0018] In this solution, the rubber strip can melt and break under the action of flame, thereby allowing the sliding shell at the corresponding position to move, so that the baffle and the lifting block can cooperate to facilitate the concentrated injection of carbon dioxide, without the need for additional components to detect the location of the lithium battery self-ignition.

[0019] The present solution enables the sliding shell to move so that the blade can pierce the airbag and the baffles at other positions can block the air outlets, and also enables the lifting inclined surface to cooperate with the lifting block to force the air outlet facing the flame to face the connecting hole, thereby facilitating the concentrated spraying of carbon dioxide onto the flame.

[0020] The airbag in this solution can not only control the up and down movement of the baffle, but also control the movement of the latch by cooperating with the piston shell, thereby controlling the opening of the valve to release the carbon dioxide in the fire extinguisher bottle.

[0021] This solution uses the movement of the mobile plate to control the movement of the closed plate, allowing the closed plate to block the heat dissipation port, so that the inside of the shell is completely isolated from the outside, and the outside air cannot enter the inside of the shell, isolating oxygen, thereby achieving a flame retardant effect; the mobile plate can also separate the plug from the control board through the cooperation of the gear and the rack, disconnect the battery pack from the management system, and avoid affecting other battery packs.

[0022] This solution sets up a heat pipe to detect the temperature at the heat dissipation port. When the lithium battery has a problem and is about to spontaneously ignite, the heat pipe will cause the internal air pressure to increase due to the sharp increase in temperature at the heat dissipation port, causing the positioning clamp to separate from the positioning column, and then the moving plate to move. No additional power element is required to control the timing of the movement of the moving plate, and the structure is stable and cost-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the exploded structure of the battery pack of the present invention;

[0025] Figure 3 , Figure 4It is a structural schematic diagram of the closing plate and the control mechanism of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the present invention in the initial state;

[0027] Figure 6 This is a schematic diagram of the structure of a blade of the present invention when piercing an air bag;

[0028] Figure 7 It is a structural schematic diagram of the fire extinguisher bottle of the present invention.

[0029] Description of the numbers in the figure:

[0030] 1. Battery pack; 11. Shell; 12. Plug; 121. Tooth groove; 13. Heat dissipation port; 2. Lithium battery; 21. Heat conducting sheet; 22. Rubber strip; 3. Control board; 4. Closing board; 41. Ventilation port; 42. Closing clamp; 421. Guide surface; 43. Fan baffle; 5. Control mechanism; 51. Moving board; 511. Rack; 512. Limiting block; 513. Positioning column; 52. Gear; 53. Accumulation spring; 54. Air chamber; 541. Positioning Chuck; 542, reset slope; 55, ventilation pipe; 56, heat conduction pipe; 6, fan; 7, ventilation mechanism; 71, ventilation shell; 711, lifting block; 712, connecting pipe; 713, blade; 72, sliding shell; 721, air outlet; 73, baffle; 731, lifting slope; 732, connecting hole; 74, air bag; 75, tension spring; 8, fire extinguisher; 81, valve; 91, piston shell; 92, latch; 93, piston body; 94, latch tension spring. DETAILED DESCRIPTION

[0031] Specific embodiment 1: Please refer to Figure 1-Figure 7 A multi-string high-voltage energy storage lithium battery management system comprises a plurality of battery packs 1 arranged in sequence; the battery pack 1 comprises a housing 11, lithium batteries 2 arranged longitudinally in the housing 11, and a ventilation mechanism 7 located on the left and right sides of the lithium battery 2; the ventilation mechanism 7 comprises a ventilation shell 71, and a plurality of sliding shells 72 sliding in the ventilation shell 71 along the horizontal direction; the sliding shell 72 is evenly provided with air outlet holes 721 facing the lithium battery 2; the sliding shell 72 is connected to the lithium battery 2 by a rubber strip 22; the rubber strip 22 will melt when encountering high temperature.

[0032] The melting temperature of the rubber strip 22 is between 120°C and 200°C.

[0033] The housing 11 contains a fan 6 for providing airflow into the ventilation housing 71 and a fire extinguisher bottle 8 for providing carbon dioxide into the ventilation housing 71 ; the housing 11 contains a control panel 3 .

[0034] The left and right ends of the lithium battery 2 are respectively provided with heat conducting sheets 21 ; one end of the rubber strip 22 is connected to the heat conducting sheet 21 .

[0035] A BMU module is provided in the control board 3, and the BMU modules in several battery packs 1 are connected to a BCU module; and several BCU modules are connected to an IMU module.

[0036] This solution is a battery management system for energy storage systems with a maximum of 1500V. There are two-level management modes or three-level management modes. When working in the two-level working mode, several BMU modules + 1 BCU module can form a system, then the PCS will be connected to the BCU module, and the GPRG will be mounted on the BCU, and the update program and monitoring system operation will be realized through the remote communication of the BCU; when working in the three-level working mode, several BMU modules + multiple BCU modules + 1 IMU module can form a system, then the IMU module is the top module. At this time, the PCS or EMS external device will be configured on the IMU module, then GPRS will be configured on the IMU module at the same time, and the update program and monitoring system operation will be realized through the remote communication of the IMU.

[0037] A baffle 73 for closing the air outlet 721 is longitudinally slidably connected inside the sliding shell 72 ; the baffle 73 is evenly provided with connecting holes 732 that can face the air outlet 721 .

[0038] An airbag 74 is arranged between the lower end of the baffle 73 and the sliding shell 72; each airbag 74 is connected to each other; when the airbag 74 is inflated, the baffle 73 is located at the upper limit position, and the air outlet 721 is opposite to the connecting hole 732; a blade 713 is arranged in the vent shell 71 at a position corresponding to each airbag 74; when the rubber strip 22 breaks, the blade 713 pierces the airbag 74, each airbag 74 shrinks, and the baffle 73 is located at the lower limit position, and the baffle 73 blocks the air outlet 721.

[0039] Tension springs 75 are respectively arranged between the vent shell 71 and each sliding shell 72 to drive the sliding shell 72 to move in the direction away from the lithium battery 2; an inclined lifting slope 731 is arranged at the end of the baffle 73 away from the lithium battery 2; a lifting stop block 711 is arranged at a position of the vent shell 71 opposite to the lifting slope 731; when the rubber strip 22 breaks, the tension spring 75 drives the sliding shell 72 to move, and the lifting stop block 711 is abutted against the lifting slope 731, so that the baffle 73 is located at the upper limit position.

[0040] The fire extinguisher bottle 8 has a valve 81; the valve 81 is connected to a latch 92 for controlling the valve 81 to open; a piston shell 91 connected to each air bag 74 is fixedly connected in the outer shell 11; a piston body 93 fixedly connected to the latch 92 is sealingly and slidably connected in the piston shell 91; a latch tension spring 94 is provided between the piston body 93 and the piston shell 91; when the air bag 74 contracts, the latch 92 separates from the valve 81 and the valve 81 opens.

[0041] When the airbag 74 expands, there is high-pressure gas in the airbag 74, and then there is high-pressure gas in the piston body 93 simultaneously, the latch spring 94 generates a pulling force on the piston body 93, the latch 92 is plugged into the valve 81, and the valve 81 does not open.

[0042] The front and rear ends of the shell 11 are respectively provided with longitudinally arranged heat dissipation ports 13; a closing plate 4 for closing the heat dissipation ports 13 is longitudinally slidably connected inside the shell 11; a vent 41 that can communicate with the heat dissipation ports 13 is provided on the closing plate 4; and a control mechanism 5 for controlling the movement of the closing plate 4 is provided inside the shell 11.

[0043] The control mechanism 5 includes a moving plate 51 sliding in the horizontal direction, a force storage spring 53 driving the moving plate 51 to move, and a positioning clamp 541 limiting the movement of the moving plate 51; a limit stop block 512 is provided on the moving plate 51; and a closing clamp 42 engaged with the limit stop block 512 is provided on the closing plate 4.

[0044] The movable plate 51 is provided with a positioning column 513 which is clamped with the closing clamp 42; the closing plate 4 is provided with mutually connected heat conduction pipes 56 at positions corresponding to the respective vents 41; a vent pipe 55 which is connected with the heat conduction pipe 56 is fixedly connected in the outer shell 11; the vent pipe 55 is sealed and slidably connected with an air chamber 54 which is fixedly connected with the positioning clamp 541.

[0045] When the temperature of the heat conducting tube 56 increases, the air pressure in the heat conducting tube 56 increases, and the air chamber 54 drives the positioning clamp 541 to move, and the positioning clamp 541 is separated from the positioning column 513 .

[0046] The positioning clamp 541 is provided with an inclined reset slope 542 ; the closing clamp 42 is provided with an inclined reset guide surface 421 .

[0047] The control board 3 is plugged with a plug 12 for power transmission; a plurality of tooth grooves 121 are provided on both sides of the plug 12; a gear 52 meshing with the tooth groove 121 is rotatably connected in the housing 11; a rack 511 is provided on the movable plate 51 for driving the gear 52 to rotate and thereby separating the plug 12 from the control board 3.

[0048] The moving plate 51 moves under the action of the force storage spring 53 , the rack 511 drives the gear 52 to rotate, and the gear 52 separates the plug 12 from the control board 3 through the tooth groove 121 .

[0049] The ventilation shells 71 on both sides are connected to each other through connecting pipes 712; the air outlet end of the fan 6 is connected to a ventilation shell 71; the air inlet end of the fan 6 is opposite to a heat dissipation port 13 on the outer shell 11; a fan baffle 43 for closing the air inlet end of the fan 6 is provided on the closing plate 4 close to the fan 6.

[0050] In the initial state, each airbag 74 has high-pressure gas in it, the airbag 74 expands, the connecting hole 732 is opposite to the air outlet 721; the positioning clamp 541 is engaged with the positioning column 513, the vent 41 is opposite to the heat dissipation port 13; the rack 511 is not engaged with the gear 52, and the gear 52 can rotate freely.

[0051] When in use, the plug 12 is inserted into the corresponding control board 3, and the other end of each plug 12 in the same row is connected to the same BCU module.

[0052] After power is turned on, the fan 6 starts working, sending outside air into the ventilation shell 71, and acting on the heat conductive sheet 21 through the air outlet 721 to dissipate heat for the lithium battery 2, and then the hot air flow is discharged to the outside through the heat dissipation port 13.

[0053] When the lithium battery 2 has a tendency to self-ignite, the temperature inside the housing 11 increases, and the temperature of the airflow discharged from the heat dissipation port 13 also increases, and the increased temperature is much higher than normal, and the high-temperature airflow will act on the heat pipe 56. The gas in the heat pipe 56 expands due to heat, and the air pressure inside the heat pipe 56 increases, forcing the air chamber 54 to move upward, and then the positioning clamp 541 separates from the positioning column 513, and no longer restricts the movement of the movable plate 51. Thereafter, the movable plate 51 will move under the action of the force storage spring 53, so that the limit stop block 512 separates from the closed clamp 42, and the closed plate 4 moves downward under the action of its own gravity, and the closed plate 4 closes each heat dissipation port 13, and the fan baffle 43 closes the air inlet end of the fan 6, and then the inside of the housing 11 is isolated from the outside world, and the external oxygen will not enter the housing 11, preventing the lithium battery 2 from self-igniting. At the same time, as the movable plate 51 moves, the rack 511 meshes with the gear 52 and drives the gear 52 to rotate; the gear 52 drives the plug 12 to move through the tooth groove 121, so that the plug 12 is separated from the control board 3, and the battery pack 1 is powered off, further preventing the lithium battery 2 from self-igniting.

[0054] If a lithium battery 2 still spontaneously ignites and produces an open flame, it proves that a certain position on the shell 11 has been melted, causing the outside air to enter the shell 11, helping the lithium battery 2 to burn, and the flame will melt the rubber strip 22 closest to the spontaneous combustion position. When a rubber strip 22 breaks, the tension spring 75 drives the corresponding sliding shell 72 to move away from the lithium battery 2, and the blade 713 pierces the corresponding airbag 74, so that each airbag 74 shrinks synchronously, and the gas flows out from the pierced airbag 74. Due to the contraction of each airbag 74, for each sliding shell 72 whose rubber strip 22 is not broken, the baffle 73 will move to the lower limit position, and the baffle 73 will close the air outlet 721; for each sliding shell 72 whose rubber strip 22 is broken, the sliding shell 72 will move to the lifting inclined surface 731 and the lifting block 711, so that the baffle 73 at this position remains at the upper limit position. Then, for the vent shell 71 at this time, only the air outlet 721 directly opposite the flame position can vent gas.

[0055] As the airbag 74 is punctured, the air pressure in the piston shell 91 decreases, and the piston body 93 moves under the action of the latch spring 94, so that the latch 92 is separated from the valve 81, and the valve 81 opens. The carbon dioxide in the fire extinguisher bottle 8 will enter the ventilation shell 71 and be ejected from the air outlet 721 facing the flame, directly acting on the flame, preventing the combustion of the lithium battery 2, thereby achieving the purpose of extinguishing the fire.

Claims

1. A multi-string high-voltage energy storage lithium battery management system, characterized in that: The invention comprises a plurality of battery packs (1) arranged in sequence; the battery pack (1) comprises a housing (11), lithium batteries (2) arranged longitudinally in the housing (11), and a vent mechanism (7) located on the left and right sides of the lithium batteries (2); the vent mechanism (7) comprises a vent shell (71), and a plurality of sliding shells (72) sliding in the vent shell (71) in a horizontal direction; the sliding shell (72) is evenly provided with air outlet holes (721) facing the lithium batteries (2); the sliding shell (72) and the lithium batteries (2) are connected together by a rubber strip (22); the rubber strip (22) will melt when exposed to high temperature; A fan (6) for providing airflow into the ventilation shell (71) and a fire extinguisher bottle (8) for providing carbon dioxide into the ventilation shell (71) are installed in the housing (11); a control panel (3) is installed in the housing (11); a baffle (73) for closing the air outlet (721) is longitudinally slidably connected in the sliding shell (72); connection holes (732) that can be directly opposite to the air outlet (721) are evenly arranged on the baffle (73); An airbag (74) is arranged between the lower end of the baffle (73) and the sliding shell (72); the airbags (74) are interconnected; when the airbags (74) are expanded, the baffle (73) is located at an upper limit position, and the air outlet hole (721) is directly opposite to the connecting hole (732); a blade (713) is arranged in the vent shell (71) at a position directly opposite to each airbag (74); when the rubber strip (22) is broken, the blade (713) pierces the airbag (74), each airbag (74) contracts, the baffle (73) is located at a lower limit position, and the baffle (73) blocks the air outlet hole (721); Tension springs (75) are provided between the vent shell (71) and each sliding shell (72) to drive the sliding shell (72) to move in a direction away from the lithium battery (2); an end of the baffle (73) away from the lithium battery is provided with an inclined lifting slope (731); a lifting stop block (711) is provided at a position of the vent shell (71) opposite to the lifting slope (731); when the rubber strip (22) breaks, the tension spring (75) drives the sliding shell (72) to move, and the lifting stop block (711) abuts against the lifting slope (731), so that the baffle (73) is located at an upper limit position.

2. A multi-string high-voltage energy storage lithium battery management system according to claim 1, characterized in that: A BMU module is arranged in the control panel (3); the BMU modules in a plurality of battery packs (1) are connected to a BCU module; and a plurality of BCU modules are connected to an IMU module.

3. A multi-string high-voltage energy storage lithium battery management system according to claim 1, characterized in that: The fire extinguisher bottle (8) has a valve (81); the valve (81) is connected to a latch (92) for controlling the valve (81) to open; a piston shell (91) in communication with each air bag (74) is fixedly connected to the outer shell (11); a piston body (93) fixedly connected to the latch (92) is sealingly and slidably connected to the piston shell (91); a latch tension spring (94) is provided between the piston body (93) and the piston shell (91); when the air bag (74) contracts, the latch (92) separates from the valve (81), and the valve (81) opens.

4. A multi-string high-voltage energy storage lithium battery management system according to claim 1, characterized in that: The front and rear ends of the housing (11) are respectively provided with longitudinally arranged heat dissipation openings (13); a closing plate (4) for closing the heat dissipation openings (13) is longitudinally slidably connected inside the housing (11); a vent (41) capable of communicating with the heat dissipation openings (13) is provided on the closing plate (4); and a control mechanism (5) for controlling the movement of the closing plate (4) is provided inside the housing (11).

5. A multi-string high-voltage energy storage lithium battery management system according to claim 4, characterized in that: The control mechanism (5) comprises a moving plate (51) that slides in a horizontal direction, a force storage spring (53) that drives the moving plate (51) to move, and a positioning clamp (541) that limits the movement of the moving plate (51); a limit stop block (512) is provided on the moving plate (51); and a closing clamp (42) that is clamped with the limit stop block (512) is provided on the closing plate (4).

6. A multi-string high-voltage energy storage lithium battery management system according to claim 5, characterized in that: The movable plate (51) is provided with a positioning column (513) that is clamped with the closing clamp (42); mutually communicating heat conduction pipes (56) are provided on the closing plate (4) at positions corresponding to the respective vents (41); a vent pipe (55) that is connected with the heat conduction pipe (56) is fixedly connected inside the housing (11); and an air chamber (54) that is fixedly connected with the positioning clamp (541) is sealingly and slidably connected to the vent pipe (55).

7. A multi-string high-voltage energy storage lithium battery management system according to claim 5, characterized in that: The control panel (3) is plugged with a plug (12) for power transmission; a plurality of tooth grooves (121) are provided on both sides of the plug (12); a gear (52) meshing with the tooth grooves (121) is rotatably connected in the housing (11); and a rack (511) is provided on the movable plate (51) for driving the gear (52) to rotate and thereby separating the plug (12) from the control panel (3).

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