CN212412106U

CN212412106U - Pressure control clamp

Info

Publication number: CN212412106U
Application number: CN202021220430.1U
Authority: CN
Inventors: 包瑞奇; 窦元运; 郑强; 陈祉祎
Original assignee: Wuhu Etc Battery Ltd
Current assignee: Wuhu Etc Battery Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-26
Anticipated expiration: 2030-06-28

Abstract

The utility model discloses a pressure control anchor clamps, including electric core, end plate, bottom plate, curb plate and pressure control mechanism, bottom plate and curb plate constitute the electric core storehouse that both ends opening is used for placing electric core, and the both ends opening end in electric core storehouse is equipped with end plate and pressure control mechanism respectively, and end plate fixed connection is in the one end in electric core storehouse, and pressure control mechanism connects the other end in electric core storehouse and applys pressure for electric core, and end plate and pressure control mechanism all laminate with electric core, and end plate and pressure control mechanism constitute anchor clamps. The pressure control clamp applies constant pressure to the small piston through the external force application device, the pressure of the small piston to hydraulic oil is guaranteed to be (a set value), the pressure of the hydraulic oil to the large piston is P according to the Pascal law, and therefore constant pressure is applied to the battery cell by the output pressure of the large piston.

Description

Pressure control clamp

Technical Field

The utility model belongs to the technical field of the new forms of energy battery, concretely relates to pressure control anchor clamps.

Background

In the electric core circulation process, pole piece, positive negative pole material can be along with Li's the off-embedding, produce the inflation shrink, in the in-process of the inflation shrink of pole piece material, between material and material, the contact between material and conducting agent can become abominable, some electrode material can break even, new interface exposes in electrolyte, the continuous side reaction that takes place, in battery circulation to later stage, when electrolyte is not enough, the increase of inflation back porosity can also aggravate the poor problem of electrolyte infiltration, if control the above-mentioned phenomenon of ability effectual improvement with anchor clamps to the inflation of battery. However, too high clamp force will cause the gap between the electrode materials to be compressed excessively, and the expansion of the electrode during charging of the battery will further reduce the porosity of the material and the separator, so a force with a suitable size and not changing with the expansion and contraction of the battery cell needs to be applied to the battery to improve the interface of the battery pole piece.

The existing constant-voltage soft package battery formation clamp is applied to production, but the equipment has large floor area and complex mechanism, comprises devices such as pressure feedback, regulation and the like, cannot be applied to a plurality of application scenes of the battery, and test scenes, for example, the existing power battery is a fixed clamp fixed on a module in actual use, the pressure of the power battery can only be increased along with the expansion of a battery cell and cannot be regulated to a constant value, in the test process of the battery cell, the power battery is also placed in a simple fixed clamp consisting of two steel plates, the pressure of the battery cell is continuously increased along with the circulation, the performance of the battery in the later period of the circulation is greatly influenced along with the circulation, and part of workers also propose the application of a spring clamp, but the spring clamp is limited by a spring, the pressure of the battery cell is continuously increased in the expansion process and only the increase of the pressure of the battery cell is slowed down, the battery cell cannot be kept in a constant-pressure state, in the actual test process, when the battery cell circulates to the later stage, the expansion is serious and exceeds the compression amount of the spring, the spring cannot play a role in relieving the expansion, and the spring with the high elastic coefficient of the high spring occupies a large amount of space and cannot be used in an application scene with limited space.

SUMMERY OF THE UTILITY MODEL

To exist not enough among the prior art, the utility model aims to provide a simple structure, convenient to use can guarantee that the pressure that electric core received is invariable, can keep electric core to be in the pressure control anchor clamps of constant voltage state.

In order to achieve the above purpose, the technical scheme of the utility model is that: a pressure control clamp is characterized in that: including electric core, end plate, bottom plate, curb plate and pressure control mechanism, bottom plate and curb plate constitute the electric core storehouse that both ends opening is used for placing electric core, and the two open ends in electric core storehouse are equipped with end plate and pressure control mechanism respectively, and end plate fixed connection is in the one end in electric core storehouse, and pressure control mechanism connects and applys pressure for electric core at the other end in electric core storehouse, and end plate and pressure control mechanism all laminate with electric core, and end plate and pressure control mechanism constitute anchor clamps.

Furthermore, the pressure control mechanism comprises a large piston, a hydraulic cylinder and a force application device, one end of the large piston is attached to the battery core, the other end of the large piston is installed in the hydraulic cylinder, the large piston can move in the hydraulic cylinder, and the other end of the hydraulic cylinder is connected with the force application device.

Furthermore, the pressure control mechanism further comprises an oil delivery pipe and hydraulic oil, one end of the oil delivery pipe is connected with the hydraulic cylinder, the other end of the oil delivery pipe is connected with the force application device, the hydraulic cylinder and the oil delivery pipe are filled with the hydraulic oil, and the force applied by the force application device is transmitted to the large piston through the hydraulic oil.

Furthermore, the pressure control mechanism also comprises a small piston, one end of the small piston is connected with the force application device, the other end of the small piston is installed in the oil delivery pipe, the small piston can move in the oil delivery pipe, and the force applied by the force application device is transmitted to the hydraulic oil through the small piston.

Furthermore, the small piston is connected to the oil delivery pipe in a sealing mode, the large piston is connected to the hydraulic cylinder in a sealing mode, the large piston, the small piston, the oil delivery pipe and the hydraulic cylinder jointly form a sealed oil storage space, and the joints have sealing performance and certain compressive strength.

Adopt the utility model discloses technical scheme's advantage does:

1. the utility model discloses an external force applying device applys constant pressure to little piston, guarantees that little piston is (the setting value) to the pressure of hydraulic oil, can know through the Pascal law, and hydraulic oil applys the pressure that the size is P to big piston to ensure that big piston output pressure applys constant pressure to electric core.

2. The utility model provides a pressure control anchor clamps compares with current fixture device and has apparent volume advantage: the device has the advantages of no spring occupying a large amount of space, no need of systems such as pressure real-time feedback and the like, no need of a complex pressure regulating system and only need of a constant pressure device. Under apparent volume advantage, this pressure control anchor clamps can be applied to various application fields such as electric core production, electric core test, battery module, battery PACK.

3. The pressure control clamp provided by the utility model can keep a battery material interface in a good state in the whole life cycle, ensure the consistency of the whole pole piece in the whole life cycle, and finally can obviously prolong the cycle life of the battery cell and the charging and discharging capacity; the constant pressure can be applied in the whole life cycle of the battery core without being influenced by the expansion of the battery core.

Drawings

The invention will be described in further detail with reference to the following drawings and detailed description:

fig. 1 is the structure diagram of the pressure control clamp of the present invention.

The labels in the above figures are respectively: 1. a large piston; 2. a hydraulic cylinder; 3. hydraulic oil; 4. an oil delivery pipe; 5. A small piston; 6. a force application device; 7. an end plate; 8. a base plate; 9. and (5) battery cores.

Detailed Description

In the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "plane direction", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in fig. 1, a pressure control fixture includes a battery cell 9, an end plate 7, a bottom plate 8, a side plate and a pressure control mechanism, wherein the bottom plate 8 and the side plate form a battery cell bin with two open ends for placing the battery cell 9, the two open ends of the battery cell bin are respectively provided with the end plate 7 and the pressure control mechanism, the end plate 7 is fixedly connected to one end of the battery cell bin, the pressure control mechanism is connected to the other end of the battery cell bin to apply pressure to the battery cell 9, the end plate 7 and the pressure control mechanism are both attached to the battery cell 9, and the end plate 7 and the pressure control mechanism.

The pressure control mechanism comprises a large piston 1, a hydraulic cylinder 2 and a force application device 6, one end of the large piston 1 is attached to a battery cell 9, the other end of the large piston 1 is installed in the hydraulic cylinder 2, the large piston 1 can move in the hydraulic cylinder 2, and the other end of the hydraulic cylinder 2 is connected with the force application device 6. The large piston exerts pressure on the battery cell and bears the action of reaction force brought by the battery cell and needs to be tightly attached to a stress surface of the battery cell; the large piston also serves to seal the hydraulic cylinder, which needs to be prevented from leaking oil.

The pressure control mechanism further comprises an oil delivery pipe 4 and hydraulic oil 3, one end of the oil delivery pipe 4 is connected with the hydraulic cylinder 2, the other end of the oil delivery pipe 4 is connected with the force application device 6, the hydraulic cylinder 2 and the oil delivery pipe 4 are filled with the hydraulic oil 3, the force applied by the force application device 6 is transmitted to the large piston 1 through the hydraulic oil 3 and then transmitted to the electric core 9, clamping of the electric core is realized when the electric core expands, and the electric core is applied with pressure to control expansion of the electric core.

The pressure control mechanism further comprises a small piston 5, one end of the small piston 5 is connected with a force application device 6, the other end of the small piston 5 is installed in the oil pipeline 4, the small piston 5 can move in the oil pipeline 4, and force applied by the force application device 6 is transmitted to the hydraulic oil 3 through the small piston 5. Little piston 5 sealing connection is on defeated oil pipe 4, and big piston 1 sealing connection is on pneumatic cylinder 2, and big piston 1, little piston 5, defeated oil pipe 4 and pneumatic cylinder 2 have constituteed airtight oil storage space jointly, and the junction all has very strong leakproofness and certain compressive strength.

The liquid pressure is non-directional, and the hydraulic cylinder also needs to bear certain pressure intensity without deformation; the hydraulic oil plays a role in pressure intensity conduction and is connected with the large piston and the small piston; the small piston functions to receive pressure from the pressure device and to transmit the pressure to the hydraulic oil; meanwhile, the small piston also plays a role in sealing to prevent oil leakage of the hydraulic cylinder and the oil delivery pipe; the oil delivery pipe plays a role in transferring hydraulic oil, is connected with the hydraulic cylinder and simultaneously needs to bear certain pressure. The force application device is used for transmitting pressure input from the outside to the small piston, the outside can apply pressure to the small piston in any mode, and at present, the mode of controlling constant pressure is various, and details are not repeated.

The utility model discloses a theory of operation: the external force application device 6 applies constant pressure to the small piston 5, the pressure of the small piston to hydraulic oil is guaranteed to be P (set value), and the pressure of the hydraulic oil to the large piston is obtained by knowing through the Pascal law, so that the constant pressure is applied to the battery cell 9 by the output pressure of the large piston.

According to the principle that the liquid pressure is equal everywhere, the pressure applied to the electric core is the pressure applied to the small piston. According to the pressure formula F ═ PS, since the small piston area can be designed to be small, sufficient pressure can be obtained only by applying a small pressure at the pressure device. By the Pascal law, a small force is applied to the small piston, so that the battery cell can obtain a sufficiently large extrusion force.

Preferably, the large piston ensures certain mobility, and when the battery cell expands, the piston can freely stretch under a set pressure, so that the battery cell is always under the preset pressure; because the big piston is extruded, hydraulic oil can be pressed into in the oil delivery pipe, consequently the oil delivery pipe space needs the design needs to be sufficient, especially the movable part of oil delivery pipe and little piston cooperation department needs enough long, or uses structures such as oil tank fuel outlet valve to adjust the oil mass in the hydraulic means.

The pressure control clamp provided by the utility model can keep a battery material interface in a good state in the whole life cycle, ensure the consistency of the whole pole piece in the whole life cycle, and finally can obviously prolong the cycle life of the battery cell and the charging and discharging capacity; the constant pressure can be applied in the whole life cycle of the battery core without being influenced by the expansion of the battery core.

The utility model provides a pressure control anchor clamps compares with current fixture device and has apparent volume advantage: the device has the advantages of no spring occupying a large amount of space, no need of systems such as pressure real-time feedback and the like, no need of a complex pressure regulating system and only need of a constant pressure device. Under apparent volume advantage, this pressure control anchor clamps can be applied to various application fields such as electric core production, electric core test, battery module, battery PACK.

The oil delivery pipe part can be arranged according to the application scene, the application space and the pressure input device, the pipeline shape and the trend can be designed randomly according to the requirement on the premise of ensuring the pressure intensity, and the installation flexibility is high. The pressure control clamp provided by the utility model can be applied to various flat-plate type battery cores, such as soft package batteries and square aluminum shell batteries which are commercially applied at present; the battery cell bin of the clamp is more flexible than the existing pressure clamp, and the number of the battery cells connected in series and parallel can be randomly adjusted according to the size of the battery cells.

The inventor has carried out a great deal of experimental verification on 2Ah soft package cells and 53Ah hard shell cells, and according to the test results:

1. in the circulation process of the battery cell, the circulation life of the battery cell with the clamp is obviously superior to that of the battery cell without the clamp;

2. however, the clamp force is too high, and when the electric core is pressed too much, the interface of the electrode material in the electric core is greatly influenced, so that the circulation of the electric core is sharply attenuated;

3. in the process of charging the battery core, the battery core can generate obvious expansion, the expansion is gradually intensified in the circulating process, if the expansion of the battery core is forcibly limited by a fixing clamp, the extrusion force borne by the battery core can be gradually increased, so that the actual pressure in the pole piece is increased, the interface of materials is gradually deteriorated, and finally the attenuation of the circulating life of the battery core is accelerated;

by combining the test results, the cycle life of the battery cell can be effectively prolonged by appropriate constant clamp force; the inventors have therefore devised a clamp for hydraulically controlling the pressure to which a cell is subjected, which ensures that the pressure to which the cell is subjected is constant.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, and various insubstantial improvements can be made without the technical solutions of the present invention, or the present invention can be directly applied to other occasions without the improvements, and all are within the protection scope of the present invention.

Claims

1. A pressure control clamp is characterized in that: including electric core (9), end plate (7), bottom plate (8), curb plate and pressure control mechanism, bottom plate (8) and curb plate constitute the electric core storehouse that both ends opening is used for placing electric core (9), the both ends in electric core storehouse are equipped with end plate (7) and pressure control mechanism respectively, end plate (7) fixed connection is in the one end in electric core storehouse, pressure control mechanism connects the other end in electric core storehouse and applys pressure for electric core (9), end plate (7) and pressure control mechanism all laminate with electric core (9), end plate (7) and pressure control mechanism constitute anchor clamps.

2. A pressure control fixture as recited in claim 1, wherein: the pressure control mechanism comprises a large piston (1), a hydraulic cylinder (2) and a force application device (6), one end of the large piston (1) is attached to the battery core (9), the other end of the large piston (1) is installed in the hydraulic cylinder (2), the large piston (1) can move in the hydraulic cylinder (2), and the other end of the hydraulic cylinder (2) is connected with the force application device (6).

3. A pressure control fixture as recited in claim 2, wherein: the pressure control mechanism further comprises an oil delivery pipe (4) and hydraulic oil (3), one end of the oil delivery pipe (4) is connected with the hydraulic cylinder (2), the other end of the oil delivery pipe (4) is connected with the force application device (6), the hydraulic cylinder (2) and the oil delivery pipe (4) are filled with the hydraulic oil (3), and the force applied by the force application device (6) is transmitted to the large piston (1) through the hydraulic oil (3).

4. A pressure control fixture as recited in claim 3, wherein: the pressure control mechanism further comprises a small piston (5), one end of the small piston (5) is connected with the force application device (6), the other end of the small piston (5) is installed in the oil conveying pipe (4), the small piston (5) can move in the oil conveying pipe (4), and force applied by the force application device (6) is transmitted to the hydraulic oil (3) through the small piston (5).

5. A pressure control fixture as recited in claim 4, wherein: little piston (5) sealing connection is on defeated oil pipe (4), and big piston (1) sealing connection has constituteed airtight oil storage space jointly on pneumatic cylinder (2), big piston (1), little piston (5), defeated oil pipe (4) and pneumatic cylinder (2), and the junction all has leakproofness and certain compressive strength.