A plate pressure sensor

Abstract

The application discloses a plate type pressure sensor, which comprises a shell, a hollow cavity is arranged in the shell, a meandering groove is arranged on one side of the shell, a pressure bearing plate is arranged on one side of the meandering groove, a temperature sensor is connected to one side of the top of the shell, a reset spring and a heat exchange pipe are arranged in the hollow cavity, connectors are arranged on both sides of the bottom of the shell, an oil seal is arranged on one side of the pressure bearing plate, the shell and the pressure bearing plate are connected through a pre-tightening connecting mechanism, the pre-tightening connecting mechanism comprises a stud and a pre-tightening nut, a hydraulic sensor is connected to the other side of the top of the shell through an adapter, and the hollow cavity is filled with hydraulic oil. The application can effectively monitor the stress condition of an object in the whole hot-pressing process, has high monitoring accuracy, can realize uniform constant-temperature heating, can effectively prevent the case that the local temperature is too high, and has high practicability.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production, specifically to a plate-type pressure sensor. Background Technology

[0002] With energy shortages and global environmental pressures, lithium batteries are now widely used across various industries. A pressure sensor is a device that senses changes in pressure and converts those changes into electrical signals.

[0003] During the production of lithium battery cells, pressure sensors are needed to monitor the stress on each cell throughout the hot-pressing process. Existing solid push plates cannot accurately monitor the pressure on the battery pack. During pressurization, uneven heating can easily occur in certain areas of the cells, and automatic control and adjustment are not possible, nor is traceability possible, resulting in a consistently low yield rate. Currently, no effective solution has been proposed to address these technical problems. Summary of the Invention

[0004] To address the problems in related technologies, this invention proposes a plate-type pressure sensor to overcome the aforementioned technical issues in existing technologies. The purpose of this invention is to effectively monitor the stress state of an object during the entire hot pressing process, with high monitoring accuracy. It also achieves uniform and constant temperature heating, effectively preventing local overheating, improving yield, and demonstrating strong practicality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plate-type pressure sensor, comprising a housing, a hollow cavity inside the housing, a U-shaped groove on one side of the housing, a pressure plate on one side of the U-shaped groove, an O-ring seal inside the U-shaped groove, a temperature sensor connected to the top side of the housing, a reset spring and a heat exchange tube inside the hollow cavity, connectors on both sides of the bottom of the housing, the two connectors being connected to the two ends of the heat exchange tube respectively, an oil seal on one side of the pressure plate, the housing and the pressure plate being connected by a pre-tightening connection mechanism, the pre-tightening connection mechanism comprising a stud and a pre-tightening nut, both ends of the stud having external threads, one end of the stud being threadedly connected to and welded to the pressure plate, countersunk holes on all four sides of the housing, the other end of the stud penetrating the housing and extending into the countersunk hole, and the end being threadedly connected to the pre-tightening nut, a hydraulic sensor connected to the other side of the top of the housing via an adapter, and the hollow cavity being filled with hydraulic oil.

[0006] Preferably, the reset spring is fixedly installed inside the hollow cavity by screws.

[0007] Preferably, the stud is arranged in a cylindrical shape.

[0008] Preferably, the O-ring is configured with a planar sealing structure.

[0009] Preferably, the connecting mechanism is provided in eight groups and is arranged symmetrically.

[0010] Preferably, the pressure plate is connected to the oil seal.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] (1) This invention is a plate-type pressure sensor. It consists of a shell, a pressure plate, an oil seal, a pre-tightening connection mechanism, a reset spring, and a hydraulic sensor. External pressure is applied to both sides of the plate-type pressure sensor. The pressure plate moves to one side of the shell under pressure, thereby compressing the hydraulic oil inside the hollow cavity. The hydraulic oil pressure changes, and the oil pressure is transmitted to the hydraulic sensor through the internal channel of the adapter. The pressure value of the hydraulic sensor is converted into the magnitude of the external pressure (Newtons). The structure is simple and can effectively monitor the stress state of the lithium battery cell during the entire hot pressing process. The monitoring accuracy is high.

[0013] (2) The present invention is a plate pressure sensor. By setting a temperature sensor and a heat exchange tube, the temperature sensor can effectively monitor the temperature inside the hollow cavity. The temperature sensor and the heat exchange tube constitute a constant temperature closed-loop control hardware to achieve constant temperature control, solve the problem of product quality being affected by excessive local temperature, and improve the yield rate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the outer casing of the present invention.

[0017] In the attached diagram, the following are the reference numerals: 1. Outer shell; 2. Hollow cavity; 3. Pressure plate; 4. U-shaped groove; 5. O-ring seal; 6. Temperature sensor; 7. Reset spring; 8. Heat exchange tube; 9. Connector; 10. Oil seal; 11. Stud; 12. Preload nut; 13. Countersunk hole; 14. Adapter; 15. Hydraulic sensor. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] Example

[0020] Please see Figure 1-3This invention proposes a technical solution for a plate-type pressure sensor: a plate-type pressure sensor includes a housing 1, with a hollow cavity 2 inside the housing 1. Specifically, the hollow cavity 2 has a rectangular structure. A U-shaped groove 4 is formed on one side of the housing 1, and a pressure plate 3 is provided on one side of the U-shaped groove 4. An O-ring seal 5 is provided inside the U-shaped groove 4, specifically, the O-ring seal 5 serves as a planar seal. A temperature sensor 6 is connected to the top side of the housing 1, specifically, the temperature sensor 6 is used to monitor the temperature. A reset spring 7 and a heat exchange tube 8 are provided inside the hollow cavity 2. Specifically, the heat exchange tube 8 is made of a metal material, such as copper. The temperature sensor 6 and the heat exchange tube 8 constitute a constant temperature closed-loop control hardware. The reset spring 7 and the pre-tightening nut 12 provide pre-pressure and reset the pressure plate 3 after being pressed. Connectors 9 are provided on both sides of the bottom of the housing 1. The two connectors 9 are respectively connected to the two ends of the heat exchange tube 8. Specifically, one end of the heat exchange tube 8 is the inlet end. The other end of the replacement pipe 8 is the output end. An oil seal 10 is provided on one side of the pressure plate 3. The outer shell 1 and the pressure plate 3 are connected by a pre-tightening connection mechanism, which includes a stud 11 and a pre-tightening nut 12. Both ends of the stud 11 are provided with external threads. One end of the stud 11 is threadedly connected to the pressure plate 3 and welded. Specifically, the welding is performed by laser. The outer shell 1 is provided with countersunk holes 13 on all four sides. The other end of the stud 11 passes through the outer shell 1 and extends into the interior of the countersunk hole 13, and the end is threadedly connected to the pre-tightening nut 12. Specifically, the stud 11 is movably connected to the outer shell 1. The pressure plate 3 moves when it is under pressure, thereby causing the stud 11 connected to it to move. The other side of the top of the outer shell 1 is connected to a hydraulic sensor 15 through an adapter 14. Specifically, the adapter 14 and the hydraulic sensor 15 constitute a bypass pressure measurement structure. The interior of the hollow cavity 2 is filled with hydraulic oil. Specifically, the outer shell 1 and the pressure plate 3 form the overall structure of a plate pressure sensor. The two planes of the plate pressure sensor are under pressure.

[0021] Please see Figure 2 As shown, the reset spring 7 is further fixedly installed inside the hollow cavity 2 by screws.

[0022] In this embodiment, screws are provided to facilitate installation and disassembly, and to make it easy to replace the reset spring 7.

[0023] Please see Figure 2 As shown, the stud 11 is further configured in a cylindrical shape.

[0024] Please see Figure 2 As shown, the O-ring 5 is further configured with a planar sealing structure.

[0025] Please see Figure 2 As shown, there are eight sets of connecting mechanisms, which are arranged symmetrically.

[0026] In this embodiment, two sets of [something] are provided around the perimeter of the outer casing 1.

[0027] Please see Figure 2 As shown, the pressure plate 3 is further connected to the oil seal 10.

[0028] In this embodiment, the oil seal 10 serves to seal and prevent hydraulic oil from leaking out.

[0029] Specifically, the working principle and usage process of this invention are as follows: The plate pressure sensor of this invention is installed on the push plate bracket, and the push plate bracket is installed between two lithium battery packs. The plate pressure sensor effectively monitors the stress state of the lithium battery cell during the entire hot pressing process, with high monitoring accuracy. External pressure is applied to both sides of the plate pressure sensor. During the monitoring process, the pressure plate 3 is subjected to pressure and moves to one side of the outer shell 1, thereby compressing the hydraulic oil inside the hollow cavity 2. The hydraulic oil pressure changes, and the oil pressure is transmitted to the hydraulic sensor 15 through the adapter 14. The pressure value (pressure intensity) of the hydraulic sensor is converted into the magnitude of the external pressure (Newtons). The temperature sensor 6 is used to monitor the temperature inside the hollow cavity 2. The temperature sensor 6 and the heat exchange tube 8 constitute the constant temperature closed-loop control hardware.

[0030] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plate-type pressure sensor, characterized in that, The device includes an outer shell (1), a hollow cavity (2) inside the outer shell (1), a U-shaped groove (4) on one side of the outer shell (1), a pressure plate (3) on one side of the U-shaped groove (4), an O-ring (5) inside the U-shaped groove (4), a temperature sensor (6) connected to the top side of the outer shell (1), a reset spring (7) and a heat exchange tube (8) inside the hollow cavity (2), connectors (9) on both sides of the bottom of the outer shell (1), the two connectors (9) being connected to the two ends of the heat exchange tube (8) respectively, and an oil seal (10) on one side of the pressure plate (3). The outer shell (1) and the pressure plate (3) are connected by a pre-tightening connection mechanism, which includes a stud (11) and a pre-tightening nut (12). Both ends of the stud (11) are provided with external threads. One end of the stud (11) is threaded and welded to the pressure plate (3). The outer shell (1) is provided with countersunk holes (13) around its perimeter. The other end of the stud (11) passes through the outer shell (1) and extends into the interior of the countersunk hole (13), and its end is threaded to the pre-tightening nut (12). A hydraulic sensor (15) is connected to the other side of the top of the outer shell (1) through an adapter (14). The interior of the hollow cavity (2) is filled with hydraulic oil.

2. A plate-type pressure sensor according to claim 1, characterized in that, The reset spring (7) is fixedly installed inside the hollow cavity (2) by screws.

3. A plate-type pressure sensor according to claim 1, characterized in that, The stud (11) is arranged in a cylindrical shape.

4. A plate-type pressure sensor according to claim 1, characterized in that, The O-ring (5) is configured with a planar sealing structure.

5. A plate-type pressure sensor according to claim 1, characterized in that, The pre-tightening connection mechanism is provided in eight sets, and is arranged symmetrically.

6. A plate-type pressure sensor according to claim 1, characterized in that, The pressure plate (3) is connected to the oil seal (10).

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