Low-cost lithium-ion battery electrolyte and leak-proof lithium-ion battery pack

Abstract

The present invention relates to the technical field of lithium-ion batteries, and specifically to low-cost lithium-ion battery electrolyte and a leakage-proof lithium-ion battery pack, comprising a battery pack bottom shell, and single cells and an integrated fixing frame arranged inside the battery pack bottom shell, wherein the single cells are fixed to each other by the integrated fixing frame, a lifting partition is arranged below the single cells, a dynamic vertical plate is arranged below the lifting partition, the dynamic vertical plates are evenly distributed in a linear array, and a vertical plate central axis is arranged in the dynamic vertical plate; the leakage-proof lithium-ion battery pack of the present invention is used in new energy vehicles, and can effectively reduce the probability of leakage caused by collision.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, in particular to low-cost lithium ion battery electrolyte and a leak-proof lithium ion battery pack. Background Art

[0002] A lithium-ion battery pack is composed of multiple lithium battery cells connected in series and in parallel. It has the characteristics of high voltage and large capacity, and is most commonly used in power batteries, such as new energy vehicles. In actual vehicle applications, once a lithium-ion battery pack is collided and leaks, the electrolyte will leak out and the battery pack will directly lose its power supply capability, causing the vehicle to be unable to drive. Traditional lithium-ion battery packs are only protected by metal plates at the bottom. When the metal plate is too thick, it is not conducive to lightweight control of the vehicle. When the thickness is thin, the protection performance is insufficient, and the risk of collision leakage is higher. Summary of the invention

[0003] The object of the present invention is to provide a low-cost lithium-ion battery electrolyte and a leak-proof lithium-ion battery pack to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a leakproof lithium-ion battery pack, comprising a battery pack bottom shell, a single cell and an integrated fixing frame arranged inside the battery pack bottom shell, wherein the single cells are fixed to each other by the integrated fixing frame, a lifting partition is arranged below the single cell, a dynamic vertical plate is arranged below the lifting partition, the dynamic vertical plates are evenly distributed in a linear array, a vertical plate middle axis is arranged in the dynamic vertical plate, and two ends of the vertical plate middle axis respectively penetrate through the side wall of the battery pack bottom shell, a front end detection bar is arranged outside the battery pack bottom shell, an angle control deflection head is fixedly arranged at the end of the vertical plate middle axis, a latch slot is opened in the angle control deflection head, and an explosion driving mechanism with a self-locking function is arranged outside the battery pack bottom shell; the dynamic vertical plate is in a horizontal state by default, and when the front end detection bar detects extrusion, the explosion driving mechanism pushes the angle control deflection head to rotate through the latch slot, so that the vertical plate middle axis drives the dynamic vertical plate to rotate ninety degrees, and the dynamic vertical plate is transformed from a horizontal state to a vertical state.

[0005] The explosion drive mechanism includes a driving pin, an I-shaped synchronization rod and an arm clamp. The driving pin is limitedly inserted in a pin slide groove. The driving pin is fixedly installed with the I-shaped synchronization rod. The outer surface of the battery pack bottom shell is fixedly provided with an arm clamp, and the arm clamp clamps the I-shaped synchronization rod to limit the position.

[0006] A mounting plate is fixedly provided on the surface of the battery pack bottom shell, a fixed steel cylinder is fixedly provided on the mounting plate, an internal limiting ring is fixedly provided on the inner wall surface of the fixed steel cylinder, and a port limiting ring is fixedly provided at the end position of the fixed steel cylinder.

[0007] A piston body is arranged between the internal limiting ring and the port limiting ring, and the outer surface of the piston body is in sliding sealing contact with the inner wall surface of the fixed steel cylinder. A piston connecting rod is fixedly arranged on the side surface of the piston body facing the port limiting ring, and a triangular base is fixedly arranged on the piston connecting rod, and the triangular base is fixedly installed with the I-shaped synchronization rod.

[0008] A protective sealing film is sealed between the port limit ring and the piston connecting rod, and the protective sealing film is broken when the piston connecting rod moves axially. Solid explosives are arranged inside the fixed steel cylinder, and the solid explosives are located on the side of the internal limit ring away from the position of the piston body.

[0009] A lifting lock tongue is vertically inserted in the mounting platform, and the lower end of the lifting lock tongue is in compression contact with the triangular base. A lock tongue spring piece is fixedly arranged on the mounting platform, and the lock tongue spring piece applies downward elastic pressure to the lifting lock tongue. A lock tongue slot is provided on the upper surface of the piston connecting rod, and when the piston body contacts the port limit ring, the lifting lock tongue can be inserted into the lock tongue slot.

[0010] A compression cavity is provided in the piston body, and a connecting inner path is provided in the piston connecting rod and the triangular base. The connecting inner path is connected to the compression cavity. An impact pin is sealed and inserted in the triangular base, and the upper end of the impact pin is against the lower surface of the lifting lock tongue. When the compression cavity is compressed, the air pressure can push the impact pin to move upward through the connecting inner path.

[0011] A back guide piece is attached to the surface of the front detection bar, an insulating soft pad is attached to the surface of the back guide piece, and contact plug holes are evenly penetrated through the insulating soft pad.

[0012] A front guide piece is attached to the surface of the insulating cushion, and a guide piece contact is fixedly arranged on the front guide piece, and the guide piece contact is inserted into the contact socket; when the surface of the front guide piece is squeezed, it deforms, compresses the insulating cushion, so that the guide piece contact is connected and contacted with the back guide piece; when the guide piece contact is connected and contacted with the back guide piece, the solid explosive is powered and detonated.

[0013] A low-cost lithium-ion battery electrolyte is filled in a leak-proof lithium-ion battery pack. The electrolyte consists of a solvent, a solute and an additive. The solvent includes dimethyl carbonate and ethyl methyl carbonate, the solute includes lithium tetrafluoroborate, lithium bis(oxalatoborate) and lithium bis(chlorophosphimide), and the additive includes a flame retardant additive, a rate-type additive and an overcharge protection additive.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The leak-proof lithium-ion battery pack of the present invention is applied in new energy vehicles and can effectively reduce the probability of leakage caused by collision; in a default state, the dynamic vertical plate is in a horizontal state, which can effectively reduce the center of gravity of the battery pack and improve vehicle performance; when the front detection bar detects an upcoming extrusion collision, the dynamic vertical plate can be driven in advance to flip 90 degrees and become a vertical state, at which time the single battery cell and the lifting partition are squeezed and raised, which can reduce the probability of collision, and the dynamic vertical plate in a vertical state can greatly improve the impact resistance in the direction along the vertical vertical edge; keep the vehicle lightweight, use the least reinforcement material to obtain the maximum impact resistance effect; improve the protection effect of the single battery cell, and reduce the probability of the vehicle being unable to drive due to leakage after the collision.

[0016] The invention provides an explosion driving mechanism, which can utilize the explosion impact generated by the solid explosive to make a quick response and drive the dynamic stand to flip. At the same time, the dynamic stand can be self-locked and fixed after flipping into place, thereby improving the stability of the dynamic stand in a vertical state.

[0017] By cooperating with the provided compression cavity, the connecting inner path, the impact pin and other structures, at the moment of detonation of the solid explosive, the impact pressure can compress the compression cavity, causing the impact pin to extend out and actively lift the lifting lock tongue, thereby reducing the obstruction of the lifting lock tongue on the movement of the triangular base and improving the smoothness of the mechanism movement.

[0018] The low-cost lithium-ion battery electrolyte of the present invention can reduce the cost of the electrolyte while ensuring the performance of the electrolyte as much as possible, thereby effectively improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 for Figure 1 A magnified schematic diagram of area A in the middle.

[0021] Figure 3 It is a schematic diagram of the overall structure of the present invention from another angle.

[0022] Figure 4 It is a three-dimensional half-section schematic diagram of the present invention.

[0023] Figure 5 It is a three-dimensional half-section schematic diagram of the fixing steel cylinder of the present invention.

[0024] Figure 6 for Figure 5 Enlarged schematic diagram of area B in the middle.

[0025] Figure 7 It is a three-dimensional half-section schematic diagram of the front end detection bar of the present invention.

[0026] Figure 8 for Figure 7 Enlarged schematic diagram of area C in the middle.

[0027] Fig. 9 It is a schematic diagram of the explosion structure of the present invention.

[0028] Fig.10 for Fig. 9 Enlarged schematic diagram of area D in the middle.

[0029] In the figure: 1. Battery pack bottom shell; 2. Single battery cell; 3. Integrated fixing frame; 4. Lifting partition; 5. Dynamic vertical plate; 6. Vertical plate center axis; 7. Front detection bar; 8. Angle control tilt head; 9. Latch slide; 101. Drive latch; 102. I-shaped synchronization rod; 103. Support arm clamp; 104. Mounting table; 105. Fixed steel cylinder; 106. Internal limit ring; 107. Port limit ring; 10 8. Piston body; 109. Piston connecting rod; 110. Triangular base; 111. Protective sealing film; 112. Solid explosive; 113. Lifting lock tongue; 114. Lock tongue spring; 115. Lock tongue slot; 116. Compression cavity; 117. Internal connection; 118. Impact pin; 701. Back guide; 702. Insulating cushion; 703. Contact jack; 704. Front guide; 705. Guide contact. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a technical solution: a leak-proof lithium-ion battery pack, such as Figure 4As shown in the figure, it includes a battery pack bottom shell 1 and a single battery cell 2 and an integrated fixing frame 3 arranged inside the battery pack bottom shell 1. The single battery cells 2 are fixed to each other by the integrated fixing frame 3. A lifting partition 4 is arranged below the single battery cell 2. A dynamic vertical plate 5 is arranged below the lifting partition 4. The lifting partition 4 can play a further protective role. At the same time, when the dynamic vertical plate 5 is turned over, it can prevent the dynamic vertical plate 5 from directly causing squeezing damage to the single battery cell 2. The dynamic vertical plates 5 are evenly distributed in a linear array. A vertical plate middle axis 6 is arranged in the dynamic vertical plate 5. The two ends of the vertical plate middle axis 6 are respectively It passes through the side wall of the battery pack bottom shell 1, and a front end detection rod 7 is arranged on the outside of the battery pack bottom shell 1. An angle control deflection head 8 is fixedly arranged at the end of the vertical plate center axis 6, and a latch slide groove 9 is opened in the angle control deflection head 8. An explosion drive mechanism with a self-locking function is arranged on the outside of the battery pack bottom shell 1; the dynamic vertical plate 5 is in a horizontal state by default. When the front end detection rod 7 detects extrusion, the explosion drive mechanism pushes the angle control deflection head 8 to rotate through the latch slide groove 9, so that the vertical plate center axis 6 drives the dynamic vertical plate 5 to rotate ninety degrees, and the dynamic vertical plate 5 is transformed from a horizontal state to a vertical state.

[0032] The explosion drive mechanism includes a driving pin 101, an I-shaped synchronization rod 102 and an arm clamp 103. The driving pin 101 is limitedly inserted in the pin slide groove 9. The driving pin 101 and the I-shaped synchronization rod 102 are fixedly installed. The outer surface of the battery pack bottom shell 1 is fixedly provided with an arm clamp 103, and the arm clamp 103 limits the I-shaped synchronization rod 102.

[0033] like Figure 6 As shown in the figure, a mounting plate 104 is fixedly provided on the surface of the battery pack bottom shell 1, a fixed steel cylinder 105 is fixedly provided on the mounting plate 104, an internal limiting ring 106 is fixedly provided on the inner wall surface of the fixed steel cylinder 105, and a port limiting ring 107 is fixedly provided at the end position of the fixed steel cylinder 105.

[0034] A piston body 108 is arranged between the internal limit ring 106 and the port limit ring 107. The outer surface of the piston body 108 is in sliding sealing contact with the inner wall surface of the fixed steel cylinder 105. A piston connecting rod 109 is fixedly arranged on the side surface of the piston body 108 facing the port limit ring 107. A triangular base 110 is fixedly arranged on the piston connecting rod 109. The triangular base 110 is fixedly installed with the I-beam synchronization rod 102.

[0035] A protective sealing film 111 is provided between the port stop ring 107 and the piston connecting rod 109. The protective sealing film 111 is broken when the piston connecting rod 109 moves axially. Figure 6As shown in the figure, it plays a protective role under normal conditions and can prevent dust and water vapor from entering the fixed steel cylinder 105. When the piston connecting rod 109 moves axially, the protective sealing film 111 can be easily torn apart by the axial movement force without affecting the operation of the piston connecting rod 109. The protective sealing film 111 can be made of a thin plastic sheet. A solid explosive 112 is arranged inside the fixed steel cylinder 105. The solid explosive 112 is located on the side of the internal limit ring 106 away from the position of the piston body 108. The solid explosive 112 can explode after being energized, and it is ensured that the impact force generated by the explosion of the solid explosive 112 can drive the piston body 108.

[0036] A lifting lock tongue 113 is vertically inserted in the mounting plate 104, and the lower end of the lifting lock tongue 113 is pressed and contacted with the triangular base 110. A lock tongue spring piece 114 is fixedly arranged on the mounting plate 104, and the lock tongue spring piece 114 and the mounting plate 104 are fixedly installed by screws. The lock tongue spring piece 114 applies downward elastic pressure to the lifting lock tongue 113, and a lock tongue slot 115 is provided on the upper surface of the piston connecting rod 109. When the piston body 108 contacts the port limit ring 107, the lifting lock tongue 113 can be stuck in the lock tongue slot 115; Figure 6 As shown in the figure, under the elastic pressure of the lock tongue spring piece 114, the lower end inclined surface of the lifting lock tongue 113 is pressed on the triangular base 110, which can limit the triangular base 110 and the piston connecting rod 109 and other structures, so as to avoid the triangular base 110 and the piston connecting rod 109 in the normal state. Figure 6 Move to the right from the viewing angle in the figure, thereby avoiding causing the dynamic vertical board 5 to have any activity problems.

[0037] A compression cavity 116 is provided in the piston body 108, and a connecting inner path 117 is provided in the piston connecting rod 109 and the triangular base 110. The connecting inner path 117 is connected to the compression cavity 116. An impact pin 118 is sealed and inserted in the triangular base 110, and the upper end of the impact pin 118 is pressed against the lower surface of the lifting lock tongue 113. When the compression cavity 116 is compressed, the air pressure can push the impact pin 118 to move upward through the connecting inner path 117.

[0038] A back guide piece 701 is attached to the surface of the front detection bar 7 , and an insulating pad 702 is attached to the surface of the back guide piece 701 . Contact holes 703 are evenly penetrated through the insulating pad 702 .

[0039] A front guide piece 704 is attached to the surface of the insulating cushion 702, and a guide piece contact 705 is fixedly provided on the front guide piece 704, and the guide piece contact 705 is inserted into the contact socket 703; when the surface of the front guide piece 704 is squeezed, it deforms and compresses the insulating cushion 702, so that the guide piece contact 705 is in conductive contact with the back guide piece 701; when the guide piece contact 705 is in conductive contact with the back guide piece 701, the solid explosive 112 is powered and detonated.

[0040] A low-cost lithium-ion battery electrolyte is filled in a leak-proof lithium-ion battery pack, and specifically, a single cell 2 is filled with the electrolyte; the electrolyte consists of a solvent, a solute and an additive, the solvent includes dimethyl carbonate and ethyl methyl carbonate, the solute includes lithium tetrafluoroborate, lithium bis(oxalatoborate) and lithium bis(chlorophosphimide), and the additive includes a flame retardant additive, a rate type additive and an overcharge protection additive.

[0041] When the leak-proof lithium-ion battery pack of the present invention is in use, the front end detection bar 7 is arranged in front of the battery pack bottom shell 1 according to the traveling direction of the vehicle.

[0042] When there is a protrusion on the ground that will scratch the battery pack bottom shell 1, it will first collide with the front detection bar 7. Figure 8 As shown in the figure, the protrusions on the ground squeeze the surface of the front guide piece 704, squeezing and deforming the front guide piece 704, so that the insulating cushion 702 is compressed, and the guide piece contact 705 is connected with the back guide piece 701; when the guide piece contact 705 is connected with the back guide piece 701, the solid explosive 112 is powered to detonate it.

[0043] like Figure 6 As shown in the figure, the solid explosive 112 explodes, and the impact pressure acts on the surface of the piston body 108, pushing the piston body 108 to move its axis and compressing the compression cavity 116; when the compression cavity 116 is compressed, the air pressure can push the impact pin 118 to move upward through the connecting inner path 117, and push the lifting lock tongue 113 upward. At this time, the triangular base 110 and the piston connecting rod 109 are in the vicinity. Figure 6 The piston bodies 108 and the port stop ring 107 are in contact with each other, and the lifting lock tongue 113 is inserted into the lock tongue slot 115 for self-locking and fixing.

[0044] The I-shaped synchronous rod 102 drives the angle control deflection head 8 to rotate 90 degrees by driving the latch 101 and the latch slide 9, and the vertical plate middle axis 6 and the dynamic vertical plate 5 rotate 90 degrees accordingly. The rotation angle of the angle control deflection head 8 is related to the axial displacement distance of the I-shaped synchronous rod 102, and the axial displacement distance of the I-shaped synchronous rod 102 is equal to the distance between the internal limit ring 106 and the port limit ring 107 minus the thickness of the piston body 108. By controlling the distance between the internal limit ring 106 and the port limit ring 107, the rotation angle of the angle control deflection head 8 is limited.

[0045] After the dynamic vertical plate 5 is rotated 90 degrees, Figure 4As shown in the figure, the dynamic vertical plate 5 will push the lifting partition 4 upward, so that the single battery cell 2 is raised to reduce the probability of being hit. At the same time, the dynamic vertical plate 5 is switched to a vertical state, and the dynamic vertical plate 5 greets the impact with vertical edges, which can greatly reduce the deformation degree of the dynamic vertical plate 5 under the impact force, and obtain the maximum impact resistance effect with the least reinforcement material.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A leakproof lithium-ion battery pack, comprising a battery pack bottom shell (1), and a single battery cell (2) and an integrated fixing frame (3) arranged inside the battery pack bottom shell (1), characterized in that: The single cells (2) are fixed to each other via an integrated fixing frame (3); a lifting partition (4) is provided below the single cells (2); a dynamic vertical plate (5) is provided below the lifting partition (4); the dynamic vertical plates (5) are evenly distributed in a linear array; a vertical plate middle axis (6) is provided in the dynamic vertical plate (5); two ends of the vertical plate middle axis (6) respectively penetrate through the side walls of the battery pack bottom shell (1); a front end detection bar (7) is provided outside the battery pack bottom shell (1); an angle control deflection head (8) is fixedly provided at the end of the vertical plate middle axis (6); a latch slot (9) is provided in the angle control deflection head (8); and a vertical plate middle axis (6) is provided outside the battery pack bottom shell (1). An explosive drive mechanism with a self-locking function; the dynamic vertical plate (5) is in a horizontal state by default; when the front end detection bar (7) detects extrusion, the explosive drive mechanism pushes the angle control deflection head (8) to rotate through the latch slide groove (9), so that the vertical plate center axis (6) drives the dynamic vertical plate (5) to rotate ninety degrees, and the dynamic vertical plate (5) is transformed from a horizontal state to a vertical state; the explosive drive mechanism comprises a drive latch (101), an I-shaped synchronization rod (102) and a support arm clamp (103); the drive latch (101) is limitedly inserted in the latch slide groove (9); the drive latch (101) and the I-shaped synchronization rod (102) are fixedly installed; the outer surface of the battery pack bottom shell (1) is fixedly provided with An arm clamp (103) is provided, and the arm clamp (103) is used to limit and clamp the I-shaped synchronization rod (102); a mounting platform (104) is fixedly provided on the surface of the battery pack bottom shell (1), a fixed steel cylinder (105) is fixedly provided on the mounting platform (104), an internal limiting ring (106) is fixedly provided on the inner wall surface of the fixed steel cylinder (105), and a port limiting ring (107) is fixedly provided at the end position of the fixed steel cylinder (105); a piston body (108) is provided between the internal limiting ring (106) and the port limiting ring (107), and the outer surface of the piston body (108) is in sliding sealing contact with the inner wall surface of the fixed steel cylinder (105). A piston connecting rod (109) is fixedly arranged on a surface of the piston body (108) facing the port limit ring (107), a triangular base (110) is fixedly arranged on the piston connecting rod (109), and the triangular base (110) is fixedly installed with the I-shaped synchronous rod (102); a protective sealing film (111) is sealed between the port limit ring (107) and the piston connecting rod (109), and the protective sealing film (111) is broken when the piston connecting rod (109) moves axially; a solid explosive (112) is arranged inside the fixed steel cylinder (105), and the solid explosive (112) is located on a side of the internal limit ring (106) away from the position of the piston body (108);A lifting lock tongue (113) is vertically inserted in the mounting plate (104), and the lower end of the lifting lock tongue (113) is in compression contact with the triangular base (110). A lock tongue spring piece (114) is fixedly arranged on the mounting plate (104), and the lock tongue spring piece (114) applies downward elastic pressure to the lifting lock tongue (113). A lock tongue clamping groove (115) is provided on the upper surface of the piston connecting rod (109), and when the piston body (108) contacts the port limit ring (107), the lifting lock tongue (113) can be clamped into the lock tongue clamping groove (115); a compression cavity (116) is provided in the piston body (108), and a connecting inner path (117) is provided in the piston connecting rod (109) and the triangular base (110), and the connecting inner path (117) is connected to the compression cavity (116). 110) is sealed with an impact pin (118), the upper end of which is against the lower surface of the lifting lock tongue (113); when the compression cavity (116) is compressed, the air pressure can push the impact pin (118) to move upward through the connecting inner path (117); the I-shaped synchronous rod (102) drives the angle control deflection head (8) to rotate 90 degrees by driving the latch pin (101) to cooperate with the latch pin slide groove (9); the rotation angle of the angle control deflection head (8) is related to the axial displacement distance of the I-shaped synchronous rod (102), and the axial displacement distance of the I-shaped synchronous rod (102) is equal to the distance between the internal limit ring (106) and the port limit ring (107) minus the thickness of the piston body (108); by controlling the distance between the internal limit ring (106) and the port limit ring (107), the rotation angle of the angle control deflection head (8) is limited. ; 2. The leakproof lithium-ion battery pack according to claim 1, characterized in that: A back guide piece (701) is attached to the surface of the front detection bar (7), an insulating soft pad (702) is attached to the surface of the back guide piece (701), and contact plug holes (703) are evenly penetrated in the insulating soft pad (702).

3. The leakproof lithium-ion battery pack according to claim 2, characterized in that: The surface of the insulating soft pad (702) is provided with a front guide piece (704), and a guide piece contact (705) is fixedly provided on the front guide piece (704), and the guide piece contact (705) is inserted into the contact insertion hole (703); when the surface of the front guide piece (704) is squeezed, it deforms, compressing the insulating soft pad (702), so that the guide piece contact (705) is in conductive contact with the back guide piece (701); When the guide blade contact (705) is in contact with the back guide blade (701), the solid explosive (112) is powered and detonated.

4. A low-cost lithium-ion battery electrolyte, wherein the leak-proof lithium-ion battery pack according to any one of claims 1 to 3 is filled with the electrolyte, characterized in that: The electrolyte consists of a solvent, a solute and an additive. The solvent includes dimethyl carbonate and ethyl methyl carbonate. The solute includes lithium tetrafluoroborate, lithium bis(oxalatoborate) and lithium bis(chlorophosphimide). The additive includes a flame retardant additive, a rate type additive and an overcharge protection additive.

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