Power battery pressing plate structure

Abstract

The invention provides a power battery pressing plate structure, and relates to the technical field of new energy batteries, the power battery pressing plate structure comprises a bottom plate, a plurality of groups of battery cells are mounted in the bottom plate, an upper pressing plate is arranged above the battery cells, magnetic fluid buffer assemblies corresponding to the battery cells are arranged on the upper pressing plate, and an electromagnetic induction coil is arranged in a cylinder body above an abutting telescopic cylinder. The electromagnetic induction coil is electrified to generate a magnetic field so as to change the viscosity of a magnetofluid solution in the abutting telescopic cylinder, the displacement of the battery cell expansion detection piston is detected through the detection circuit and can be converted into the expansion amount of the abutting piston plate, and then the detection of the expansion state of the battery cell is completed. The expansion part of the battery cell is compensated through the telescopic motion of the abutting piston plate, the viscosity of the magnetic fluid medium is adjusted by applying a magnetic field to the magnetic fluid medium, vibration generated by the battery cell is effectively restrained, the magnetic fluid medium further serves as a mechanism for monitoring expansion of the battery cell, and the reliability of the battery cell is improved. And the safety of the new energy battery pack in the use process is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a power battery pressure plate structure. Background Art

[0002] With the development of new energy vehicles in recent years, electric-powered vehicles have become increasingly popular. Therefore, new energy battery packs with lower costs, higher energy density, better safety and better integrated functions have become a technical problem that the industry urgently needs to solve.

[0003] New energy battery cells experience volume changes after long-term use. This change is primarily caused by factors such as reversible and irreversible deformation of the electrode material, gas expansion, and material aging. Because cells expand over time, battery packs must include internal space for expansion during early design stages to ensure that cell expansion does not impact the pack's performance.

[0004] A new energy lithium battery pack disclosed in the prior art with the publication number "CN211150636U" includes a shell, a first spring fixedly connected to the bottom of the inner cavity of the shell, a support plate fixedly connected to the top of the first spring, a lithium battery pack body placed on the top of the support plate, a threaded rod passing through both sides of the shell, the opposite end of the threaded rod passing through the inner cavity of the shell and movably connected to a pressure plate via a bearing, a second spring fixedly connected to the side of the pressure plate away from the threaded rod, and a frame fixedly connected to the end of the second spring away from the pressure plate. This device solves the problems of poor fixing and shock absorption effects of existing lithium battery packs, the lithium battery pack easily shaking and colliding with the lithium battery box during the operation of the electric vehicle, causing damage to the lithium battery pack, and poor heat dissipation and cooling effects. Long-term use or charging causes the temperature inside the lithium battery pack to be too high, causing damage to the internal structure of the lithium battery and reducing its service life.

[0005] However, the above-mentioned device still has obvious defects during use: the above-mentioned device adopts the spring structure commonly used in the prior art to limit the shaking of the internal lithium battery, but on the one hand, the spring structure can reduce the large-scale shaking of the lithium battery, and on the other hand, it itself is prone to high-frequency vibration. During the driving of the vehicle, this high-frequency vibration may affect the line connection of the lithium battery. Long-term vibration will directly affect the service life and connection stability of the lithium battery. Summary of the Invention

[0006] The object of the present invention is to provide a power battery pressure plate structure to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A power battery pressure plate structure, comprising a bottom plate, wherein a plurality of battery cells are installed in the bottom plate, an upper pressure plate is arranged above the battery cells, and the upper pressure plate is fixedly connected to the bottom plate with bolts;

[0009] The upper pressure plate is provided with a number of magnetic fluid buffer components that are consistent with the number of battery cells and correspond one to one. Each group of magnetic fluid buffer components includes a transition telescopic cylinder and at least one abutting telescopic cylinder. The transition telescopic cylinder and the abutting telescopic cylinder are connected to each other. A abutting piston plate is installed in a lifting manner on the bottom of the abutting telescopic cylinder. The abutting piston plate movably abuts against the upper surface of the battery cell. The cavity areas inside the transition telescopic cylinder and the abutting telescopic cylinder are both filled with magnetic fluid solution. An electromagnetic induction coil is provided in the cylinder body above the abutting telescopic cylinder. The electromagnetic induction coil is connected to the power supply module through a wire. A magnetic field is generated by energizing the electromagnetic induction coil to change the viscosity of the magnetic fluid solution inside the abutting telescopic cylinder, thereby increasing the resistance of the magnetic fluid solution to flow between the transition telescopic cylinder and the abutting telescopic cylinder.

[0010] A battery cell expansion detection piston is also provided in the transition telescopic cylinder for translational sliding. A first extrusion spring is also provided between the battery cell expansion detection piston and the transition telescopic cylinder. The first extrusion spring is used to push the magnetic fluid solution in the transition telescopic cylinder to flow into the abutting telescopic cylinder. A sliding contact is provided on the battery cell expansion detection piston. A resistance track cooperating with the sliding contact is provided in the transition telescopic cylinder. The sliding contact and the resistance track are both connected to the detection circuit through wires. The displacement of the battery cell expansion detection piston is detected by the detection circuit and can be converted into the expansion and contraction amount of the abutting piston plate, thereby completing the detection of the battery cell expansion state.

[0011] Preferably, buffer partitions are installed in the gaps between the battery cells.

[0012] Preferably, a mica buffer thermal insulation sheet is further installed in the area between the upper pressure plate and the battery core, and the mica buffer thermal insulation sheet is provided with abutment through holes for the abutment piston plate to pass through.

[0013] Preferably, a plurality of second extrusion springs are further provided between the abutting piston plate and the abutting telescopic cylinder, and the second extrusion springs are used to push the abutting piston plate to move toward a side close to the battery core.

[0014] Preferably, the transition telescopic cylinder and the abutting telescopic cylinder are connected through a thin slow-flow pipe, and the thin slow-flow pipe is located on one side of the abutting telescopic cylinder and is also equipped with an extension pipe, which extends toward the side of the abutting telescopic cylinder. The extension pipe is away from the side of the thin slow-flow pipe and is located above the axis of the abutting piston plate, and the extension pipe is arranged in the gap between several second extrusion springs.

[0015] Preferably, each group of the magnetic fluid buffer components is provided with a pair of abutting telescopic cylinders, and the abutting piston plates of the pair of abutting telescopic cylinders abut symmetrically against the upper surface of the battery core.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention adopts a magnetic fluid buffer assembly to buffer and limit the battery cell, and compensates for the expanded part of the battery cell through the telescopic movement of the abutting piston plate, thereby ensuring the long-term stability of the battery cell inside the battery pack. In addition, in order to further suppress the oscillation of the battery cell during vehicle driving, a magnetic fluid medium is also provided inside the magnetic fluid buffer assembly. By applying a magnetic field to the magnetic fluid medium, the viscosity of the magnetic fluid medium is adjusted, and then the flow resistance of the magnetic fluid is adjusted, thereby increasing the abutment strength between the abutting piston plate and the battery cell under the oscillating working condition, effectively suppressing the vibration generated by the battery cell, and the magnetic fluid medium further serves as a mechanism for monitoring the expansion of the battery cell, further ensuring the safety of the new energy battery pack during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic cross-sectional perspective view of the magnetic fluid buffer assembly structure of the present invention;

[0020] Figure 3 This is a schematic side cross-sectional view of the magnetic fluid buffer assembly of the present invention;

[0021] Figure 4 It is a schematic diagram of the bottom structure of the upper pressing plate of the present invention.

[0022] In the figure: 1 bottom plate, 2 battery cell, 3 upper pressure plate, 4 magnetic fluid buffer assembly, 5 transition telescopic cylinder, 6 abutting telescopic cylinder, 7 abutting piston plate, 8 electromagnetic induction coil, 9 battery cell expansion detection piston, 10 first extrusion spring, 11 sliding contact, 12 resistance track, 13 buffer partition, 14 mica buffer thermal insulation sheet, 15 abutting through hole, 16 second extrusion spring, 17 thin slow flow pipe, 18 extension tube. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 4 , the present invention provides a technical solution:

[0025] Example 1:

[0026] A power battery pressure plate structure, comprising a base plate 1, in which a plurality of battery cells 2 are installed, and an upper pressure plate 3 is arranged above the battery cells 2, and the upper pressure plate 3 is fixedly connected to the base plate 1 with bolts;

[0027] The upper pressure plate 3 is provided with a number of magnetic fluid buffer components 4 that are the same in number and correspond one to one with the battery cells 2. Each group of magnetic fluid buffer components 4 includes a transition telescopic cylinder 5 and at least one abutting telescopic cylinder 6. The transition telescopic cylinder 5 and the abutting telescopic cylinder 6 are connected to each other. A abutting piston plate 7 is installed at the bottom of the abutting telescopic cylinder 6 in a lifting manner. The abutting piston plate 7 movably abuts against the upper surface of the battery cell 2. The cavity areas inside the transition telescopic cylinder 5 and the abutting telescopic cylinder 6 are both filled with magnetic fluid solution. An electromagnetic induction coil 8 is provided in the cylinder body above the abutting telescopic cylinder 6. The electromagnetic induction coil 8 is connected to the power supply module through a wire. By energizing the electromagnetic induction coil 8, a magnetic field is generated, thereby changing the viscosity of the magnetic fluid solution inside the abutting telescopic cylinder 6, thereby increasing the resistance of the magnetic fluid solution to flow between the transition telescopic cylinder 5 and the abutting telescopic cylinder 6.

[0028] A battery cell expansion detection piston 9 is also provided in the transition telescopic cylinder 5 for translational sliding. A first extrusion spring 10 is also provided between the battery cell expansion detection piston 9 and the transition telescopic cylinder 5. The first extrusion spring 10 is used to push the magnetic fluid solution in the transition telescopic cylinder 5 to flow into the abutting telescopic cylinder 6. A sliding contact 11 is provided on the battery cell expansion detection piston 9, and a resistance track 12 cooperating with the sliding contact 11 is provided in the transition telescopic cylinder 5. The sliding contact 11 and the resistance track 12 are both connected to the detection circuit through wires. The displacement of the battery cell expansion detection piston 9 is detected by the detection circuit, and can be converted into the expansion and contraction amount of the abutting piston plate 7, thereby completing the detection of the expansion state of the battery cell 2.

[0029] In this embodiment, the interior of the base plate 1 is used to load the cell structure of the new energy battery, wherein the cell 2 is divided into several groups, an upper pressure plate 3 is arranged above the cell 2, and the upper pressure plate 3 is fixedly connected to the base plate 1 with bolts, wherein the area where the upper pressure plate 3 and the base plate 1 abut against each other is also rubber-sealed to ensure the sealing inside the battery pack, wherein the upper pressure plate 3 is provided with several groups of magnetic fluid buffer components 4 corresponding to the number of the cell 2 and one-to-one, each group of magnetic fluid buffer components 4 includes a transition telescopic cylinder 5 and at least one abutting telescopic cylinder 6, and the abutting telescopic cylinder 6 in this embodiment is provided with two pairs, refer to the appendix of the instruction manual. Figure 1 and 4The transition telescopic cylinder 5 and the abutting telescopic cylinder 6 are connected to each other, and the cavity areas inside the transition telescopic cylinder 5 and the abutting telescopic cylinder 6 are filled with magnetic fluid solution. A abutting piston plate 7 is installed at the bottom of the abutting telescopic cylinder 6 in a lifting manner, and a pair of abutting piston plates 7 are symmetrically abutted against the upper surface of the battery core 2. A first extrusion spring 10 is also provided between the battery core expansion detection piston 9 and the transition telescopic cylinder 5. The first extrusion spring 10 squeezes the battery core expansion detection piston 9 so that the magnetic fluid solution in the transition telescopic cylinder 5 flows into the abutting telescopic cylinder 6, and finally realizes the close abutment between the abutting piston plate 7 and the surface of the battery core 2. When the battery core 2 expands after long-term use, the expanded part of the battery core 2 will push the abutting piston plate 7 to contract into the abutting telescopic cylinder 6, thereby maintaining the battery core 2. Tightly abut after expansion. There is a common problem with this type of structure in the prior art, that is, the abutting piston plate 7 is connected to the elastic mechanism, which itself will also introduce vibration, making it difficult to maintain the stability of the battery core 2 under various working conditions. For this reason, an electromagnetic induction coil 8 is provided in the cylinder body above the abutting telescopic cylinder 6 in this embodiment. The electromagnetic induction coil 8 is connected to the power supply module through a wire. By energizing the electromagnetic induction coil 8 to generate a magnetic field, the viscosity of the magnetic fluid solution inside the abutting telescopic cylinder 6 is changed, thereby increasing the resistance of the magnetic fluid solution to flow between the transition telescopic cylinder 5 and the abutting telescopic cylinder 6. The advantage of this design is that when the vehicle is traveling on a bumpy road, the resistance to flow between the transition telescopic cylinder 5 and the abutting telescopic cylinder 6 can be increased by increasing the viscosity of the magnetic fluid solution. Thereby, the magnetic fluid solution inside the telescopic cylinder 6 is maintained at the amount before the bump, and the loss of fluid in the telescopic cylinder 6 is reduced, thereby ensuring the close contact of the piston plate 7 with the battery cell 2, thereby ensuring that the battery cell 2 structure can still maintain stability when the vehicle is driving under harsh working conditions, and effectively alleviating the problem of damage to the internal battery cell 2 caused by vibration and collision. The on-off power of the electromagnetic induction coil 8 is carried out under the control of the vehicle-mounted control system, and the on-off power of the electromagnetic induction coil 8 can be further associated with the vibration amplitude of the tire, and the degree of undulation of the road surface can be evaluated by the undulation of the tire, and the working signal is sent to the electromagnetic induction coil 8 through the vehicle-mounted control system, so as to adjust the battery cell 2 in time. Furthermore, a battery cell is provided in the transition telescopic cylinder 5. The expansion detection piston 9 is provided with a sliding contact 11 on the battery cell expansion detection piston 9, and a resistance track 12 that cooperates with the sliding contact 11 is provided in the transition telescopic cylinder 5. The displacement of the battery cell expansion detection piston 9 is detected by the detection circuit. Since the cylinder diameters of the transition telescopic cylinder 5 and the abutting telescopic cylinder 6 are determined, the displacement of the battery cell expansion detection piston 9 can be converted into the expansion amount of the abutting piston plate 7, thereby completing the detection of the expansion state of the battery cell 2. Since the volume of the battery cell 2 will obviously expand before an abnormality such as a fire occurs, the collision state of the battery cell 2 can be warned by detecting the displacement of the battery cell expansion detection piston 9. Since the explosion accident of the ternary lithium battery is rapid and severe, the expansion detection of the battery cell 2 can predict the abnormal state of the battery cell 2 in advance.This advantageously ensures the safety of life and property of the driver and passengers. The sliding contact 11 and the resistance track 12 are both connected to the detection circuit via wires. This type of displacement detection device is relatively common in the prior art and will not be described in detail here. In summary, the magnetic fluid solution in this embodiment can not only ensure the stability of the battery cell 2 under various operating conditions by adjusting the viscosity, but also can advance the abnormal state of the battery cell 2 by pushing the battery cell expansion detection piston 9 to produce a position, thereby fully utilizing the fluid and magnetic properties of the magnetic fluid solution and having outstanding substantive characteristics.

[0030] Example 2:

[0031] Buffer partitions 13 are also installed in the gaps between the battery cells 2 .

[0032] A mica buffer thermal insulation sheet 14 is further installed in the area between the upper pressing plate 3 and the battery core 2 . The mica buffer thermal insulation sheet 14 is provided with abutting through holes 15 for the abutting piston plate 7 to pass through.

[0033] In this embodiment, the buffer partition 13 and the mica buffer insulation sheet 14 structure between the battery cells 2 are further disclosed. Both of them are common buffer insulation structures in the prior art, which can effectively alleviate the collision between the battery cells 2 and between the battery cells 2 and the upper pressure plate 3, thereby ensuring their working stability.

[0034] Example 3:

[0035] A plurality of second extrusion springs 16 are further provided between the abutting piston plate 7 and the abutting telescopic cylinder 6 . The second extrusion springs 16 are used to push the abutting piston plate 7 to move toward the side close to the battery core 2 .

[0036] The transition telescopic cylinder 5 is connected to the abutting telescopic cylinder 6 through a thin slow-flow pipe 17. The thin slow-flow pipe 17 is located on the side of the abutting telescopic cylinder 6 and is also equipped with an extension pipe 18. The extension pipe 18 extends toward the side of the abutting telescopic cylinder 6. The extension pipe 18 is away from the side of the thin slow-flow pipe 17 and is located above the axis of the abutting piston plate 7. The extension pipe 18 is arranged in the gap between several second extrusion springs 16.

[0037] In this embodiment, the arrangement of the second extrusion spring 16 and the extension tube 18 is further disclosed. A plurality of second extrusion springs 16 are provided, and are arranged in a ring array on the abutting piston plate 7, wherein gaps are formed between adjacent extrusion springs 16. The extension tube 18 is provided in the gaps between the second extrusion springs 16, thereby preventing the expansion and contraction of the second extrusion spring 16 from affecting the extension tube 18. The purpose of the arrangement of the extension tube 18 is to further extend the liquid inlet of the abutting telescopic cylinder 6 and the transition telescopic cylinder 5 to above the axis of the abutting piston plate 7. When the electromagnetic induction coil 8 is energized, the magnetic induction intensity there is the largest, so the viscosity of the magnetic fluid solution there is significantly increased. At this time, the flow resistance of the magnetic fluid solution in the extension tube 18 is increased, thereby ensuring that the magnetic fluid solution in the abutting telescopic cylinder 6 can stably apply pressure to the surface of the battery cell 2.

[0038] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A power battery pressure plate structure, comprising a base plate, wherein a plurality of battery cells are mounted in the base plate, an upper pressure plate is disposed above the battery cells, and the upper pressure plate is fixedly connected to the base plate with bolts, characterized in that: The upper pressure plate is provided with a number of magnetic fluid buffer components that are consistent with the number of battery cells and correspond one to one. Each group of magnetic fluid buffer components includes a transition telescopic cylinder and at least one abutting telescopic cylinder. The transition telescopic cylinder and the abutting telescopic cylinder are connected to each other. A abutting piston plate is installed in a lifting manner on the bottom of the abutting telescopic cylinder. The abutting piston plate movably abuts against the upper surface of the battery cell. The cavity areas inside the transition telescopic cylinder and the abutting telescopic cylinder are both filled with magnetic fluid solution. An electromagnetic induction coil is provided in the cylinder body above the abutting telescopic cylinder. The electromagnetic induction coil is connected to the power supply module through a wire. A magnetic field is generated by energizing the electromagnetic induction coil to change the viscosity of the magnetic fluid solution inside the abutting telescopic cylinder, thereby increasing the resistance of the magnetic fluid solution to flow between the transition telescopic cylinder and the abutting telescopic cylinder. A battery cell expansion detection piston is also provided in the transition telescopic cylinder for translational sliding. A first extrusion spring is also provided between the battery cell expansion detection piston and the transition telescopic cylinder. The first extrusion spring is used to push the magnetic fluid solution in the transition telescopic cylinder to flow into the abutting telescopic cylinder. A sliding contact is provided on the battery cell expansion detection piston. A resistance track cooperating with the sliding contact is provided in the transition telescopic cylinder. The sliding contact and the resistance track are both connected to the detection circuit through wires. The displacement of the battery cell expansion detection piston is detected by the detection circuit and can be converted into the expansion and contraction amount of the abutting piston plate, thereby completing the detection of the battery cell expansion state.

2. A power battery pressure plate structure according to claim 1, characterized in that: Buffer partitions are also installed in the gaps between some of the battery cells.

3. The power battery pressure plate structure according to claim 1, characterized in that: A mica buffer thermal insulation sheet is also installed in the area between the upper pressure plate and the battery core. The mica buffer thermal insulation sheet is provided with a supporting through hole for the supporting piston plate to pass through.

4. The power battery pressure plate structure according to claim 1, characterized in that: A plurality of second extrusion springs are further provided between the abutting piston plate and the abutting telescopic cylinder, and the second extrusion springs are used to push the abutting piston plate to move toward a side close to the battery core.

5. A power battery pressure plate structure according to claim 4, characterized in that: The transition telescopic cylinder is connected to the abutting telescopic cylinder through a thin slow-flow pipe. The thin slow-flow pipe is located on one side of the abutting telescopic cylinder and is also equipped with an extension pipe. The extension pipe extends toward the side of the abutting telescopic cylinder. The extension pipe is located above the axis of the abutting piston plate away from the side of the thin slow-flow pipe. The extension pipe is arranged in the gap between several second extrusion springs.

6. The power battery pressure plate structure according to claim 1, characterized in that: Each group of the magnetic fluid buffer components is provided with a pair of abutting telescopic cylinders, and the abutting piston plates of the pair of abutting telescopic cylinders abut symmetrically against the upper surface of the battery core.

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