Pressure formation jig

Abstract

The utility model provides a pressure formation jig, which comprises a bottom plate, a guide pillar, a mounting plate, a pressure plate and a pressure holding type air bag, the mounting plate and the bottom plate are arranged at two ends of the guide pillar, and the pressure plate is movably arranged between the mounting plate and the bottom plate. The space formed between the mounting plate and the bottom plate and the guide columns is divided into a first space and an adjacent second space, the pressure holding type air bag is arranged in the first space and can receive an external air source to expand and push the pressure applying plate to extrude the battery pack arranged in the second space, and the purpose of pressing clamping independent of the formation equipment is achieved. And when the external air source is cut off, the pressure holding type air bag can still maintain the state of extruding the pressure applying plate.

Description

Technical Field

[0001] The utility model relates to a pressure forming jig, which is applied to the pressure forming of power batteries, especially a pressure forming jig composed of a pressure maintaining airbag and capable of maintaining a pressurized state after cutting off an external air source. Background Art

[0002] In response to the booming development of the new energy vehicle market, as one of the three core technologies of new energy electric vehicles, the structural protection design and thermal management planning of power batteries are regarded as a very important part of new energy electric vehicles. Before the assembly of power batteries, a forming process is required to activate the batteries that make up the power battery; in the existing common forming methods, pressure forming is adopted, that is, the battery core is maintained at a certain pressure for forming. By pressurizing the battery core, it can effectively avoid the inconsistency of the distance between the positive electrode, the separator and the negative electrode caused by the gas generated during the forming process, which may lead to the obstruction of the lithium ion transmission from the positive electrode to the negative electrode, and help the electrolyte fully infiltrate the active material during the forming process, etc., so as to optimize the performance of the battery.

[0003] In traditional pressure forming equipment, a servo motor is mostly used as the power for pressurization. Its obvious disadvantage is that during the charging and discharging process of the battery, thermal expansion and uneven changes in the battery thickness often occur, resulting in uneven stress and causing damage to the outer shell; therefore, in recent years, airbag pressurization has gradually been adopted, which can maintain a high pressure stability even during thickness changes during the pressurization process due to the fluidity of the gas.

[0004] However, the existing forming equipment and jigs using airbags for pressurization are mostly accompanied by pipelines and controllers for heating temperature control, pressure control, etc. Therefore, the relevant pipelines and jigs are integrated and fixed on the forming equipment machine table for real-time monitoring, so they cannot be moved over a long distance. Therefore, when the forming equipment is loading the battery, it is impossible to perform relevant forming operation procedures on the battery, such as pressurization, resulting in a high production capacity loss; furthermore, if an abnormality occurs in the equipment during the forming process, it is also impossible to quickly switch the equipment, which may cause more abnormal defective products in the batteries under operation.

[0005] Based on the above deficiencies of the existing technology, the utility model proposes a pressure forming jig to effectively solve the above problems. Summary of the Utility Model

[0006] The main purpose of the present utility model is to provide a pressure forming fixture, which uses a pressure-holding airbag as a pressure source, enabling the pressure forming fixture to convey while holding pressure on the battery pack. Therefore, after the battery pack is pressed and clamped in the fixture, it can be conveyed to the forming equipment for forming and detection procedures, significantly improving the overall process productivity. At the same time, when the forming or detection equipment malfunctions or the equipment is switched, the battery can also be maintained in a pressurized state, allowing for rapid replacement and effectively improving the yield.

[0007] Another purpose of the present utility model is to provide a pressure forming fixture, which can be completely independent of the pressurized forming machine. Therefore, the installation and pressurization of the battery pack can be carried out first to improve the utilization rate of the forming equipment.

[0008] The present utility model provides a pressure forming fixture, which includes a bottom plate; at least one guide post, one end of which is fixedly arranged on the bottom plate; a mounting plate, fixedly arranged at the other end of the guide post and arranged in parallel with the bottom plate, and a space is formed between the bottom plate and the mounting plate; a pressing plate, movably arranged on the guide post, and dividing the space into a first space adjacent to the mounting plate and a second space adjacent to the bottom plate, and the second space is available for a battery pack to be arranged; and at least one pressure-holding airbag, installed in the first space, which can receive an external air source and expand, and push the pressing plate to move along the guide post towards the bottom plate to press the battery pack arranged in the second space, and can maintain the state of pressing the pressing plate when the external air source is cut off.

[0009] Preferably, one side of the pressure-holding airbag abuts against the mounting plate and the other side abuts against the pressing plate.

[0010] Preferably, one side of the pressing plate facing the second space has an insulating pressing plate.

[0011] Preferably, one side of the bottom plate facing the second space has an insulating pressing plate.

[0012] Preferably, one end of the bottom plate and the mounting plate has a base plate.

[0013] Preferably, there is at least one elevation block on the base plate.

[0014] The following is a detailed description through specific embodiments, which can more easily understand the purpose, technical content, characteristics and achieved effects of the present utility model. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the pressure forming fixture of the present utility model.

[0016] Figure 2 、 3 It is a schematic diagram of the pressure forming fixture of the present utility model placing the battery pack.

[0017] Figure 4 This is a schematic diagram of another embodiment of the pressure forming fixture of the present utility model.

[0018] Figure 5 This is a schematic diagram of another embodiment of the pressure forming fixture of the present utility model.

[0019] Reference numerals

[0020] 12 Base plate

[0021] 121 Insulating pressing plate

[0022] 14 Mounting plate

[0023] 16 Guide post

[0024] 18 Pressing plate

[0025] 181 Insulating pressing plate

[0026] 20 Space

[0027] 201 First space

[0028] 202 Second space

[0029] 21 Fixing member

[0030] 22 Base board

[0031] 23 Spacer block

[0032] 30 Holding pressure airbag

[0033] 50 Battery pack

[0034] 51 Battery cell

[0035] 52 Clamping plate Detailed implementation manners

[0036] In order to make the advantages, spirit and features of the present utility model more clearly understood, the following will be described and discussed in detail with reference to the embodiments and the accompanying drawings. It should be noted that these embodiments are only representative embodiments of the present utility model, and do not limit the implementation modes of the present utility model and the protection scope to only these embodiment modes. The purpose of providing these embodiments is only to make the disclosure content of the present utility model more thorough and easy to understand.

[0037] The terms used in the various embodiments disclosed in the present utility model are only for the purpose of describing specific embodiments, and do not limit the various embodiments disclosed in the present utility model. Unless clearly indicated otherwise, the singular forms used also include the plural forms. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meaning as commonly understood by those skilled in the art of the various embodiments disclosed in the present utility model. The above terms (such as those defined in a general dictionary) will be interpreted to have the same meaning as the contextual meaning in the same technical field, and will not be interpreted to have an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments disclosed in the present utility model.

[0038] The pressure forming fixture disclosed in the present utility model, please refer to Figure 1 , which includes a bottom plate 12, at least one guide post 16, a mounting plate 14, a pressing plate 18, and at least one pressure-holding airbag 30. The bottom plate 12, the mounting plate 14, and the pressing plate 18 are generally plate bodies of the same size and shape. The bottom plate 12 and the mounting plate 14 are respectively installed at both ends of the guide post 16, and a space 20 can be formed between the bottom plate 12 and the mounting plate 14. The pressing plate 18 is movably arranged on the guide post 16 and divides the aforementioned space 20 into a first space 201 adjacent to the mounting plate 14 and a second space 202 adjacent to the bottom plate 12. Among them, the guide post 16 is mainly used for the pressing plate 18 to slide thereon, so its quantity does not need to be particularly limited. As shown in the figure, the guide post 16 is four, so that the pressing plate 18 can slide smoothly on the guide post 16.

[0039] The pressure-holding airbag 30 is installed in the aforementioned first space 201, abuts against the mounting plate 14 on one side and the pressing plate 18 on the other side. The pressure-holding airbag 30 can receive an external air source and expand, and push the pressing plate 18 to move along the guide post 16 towards the bottom plate 12. Through its own pressure-holding characteristic, it can maintain this expanded and extruded state when the external air source is cut off. On the other hand, one end of the bottom plate 12 and the mounting plate 14 has a base plate 22, and it can be stably placed on a plane through the base plate 22. At the same time, there is a heightening block 23 in the second space 202 on the base plate 22, and the functions of this part will be described in detail later.

[0040] Continuing, please also refer to Figure 2 , 3, the battery pack 50 can be installed in the second space 202. Through the setting of the spacer block 23, the battery pack 50 can be positioned and maintained at the middle position relative to the pressing plate 18. Therefore, the pressure of the pressing plate 18 on the battery pack 50 can be relatively even. Of course, if the initial position of the battery pack 50 can already be maintained at the middle position relative to the pressing plate 18, the setting of the spacer block 23 may not be required. The battery pack 50 is composed of a plurality of battery cells 51, and a clamping plate 52 is sandwiched between the battery cells 51 to absorb the non-uniformity of the thickness of the battery cells 51 and make the pressure received by the battery pack 50 more uniform. At the same time, the clamping plate 52 is made of an insulating material (or has an insulating surface) to prevent short circuits between the battery cells 51 during the forming process. Similarly, the side of the pressing plate 18 facing the second space 202 has an insulating pressing plate 181, and the side of the bottom plate 12 facing the second space 202 has an insulating pressing plate 121. Through the setting of the insulating pressing plates 121 and 181, short circuits between the battery cells 51 and the bottom plate 12 and the pressing plate 18 can be prevented.

[0041] After removing the bottom plate 12 through a fixing member 21 such as a nut, the battery pack 50 is installed in the second space 202, and then the bottom plate 12 is locked back to set the battery pack 50 between the bottom plate 12 and the pressing plate 18. Then, after the pressure-holding airbag 30 receives an external air source, it squeezes and pushes the pressing plate 18 to press the battery pack 50. Since the air injection port of the pressure-holding airbag 30 is a pilot pneumatic one-way valve or a valve designed according to the same gas path logic, when the external air source is disconnected at this time, the pressure-holding airbag 30 can still maintain the state of squeezing or pressing the battery pack 50, and the battery pack 50 is clamped in the pressure forming jig of this case. Subsequently, the pressure forming jig with the battery pack 50 installed can be transported to the forming equipment on the production line for forming. At this time, since there is no need to wait for the time for installing the battery pack in the jig and inflating and pressing, the overall process productivity can be greatly improved. At the same time, when the forming or testing equipment is abnormal, or the equipment or process conditions are switched, it can also be quickly replaced while the battery pack 50 maintains the applied pressure, effectively improving the yield. The above process conditions can be standing or aging procedures. Here, it should be specifically noted that when clamping the battery pack, the pressure that the pressure-holding airbag 30 needs to apply to the battery pack 50 is estimated based on the required charge and discharge conditions of the pre-formed battery pack 50 and the amount of battery thickness change caused, and then the corresponding gas volume is injected into the airbag 30 to appropriately press the battery pack 50 when clamping the battery pack 50. Therefore, the gas volume injected into the airbag 30 will vary with the material of the battery pack and the relevant parameter settings of the forming process. The pressure value and its operating time and other conditions in this part are not the focus of the present invention and will not be elaborated here.

[0042] Furthermore, please refer to FIGS. 2 and 3. Two holding-pressure air bags 30 are shown in the figures. They are mainly configured to match the common rectangular battery unit 51. If the length of the battery pack 50 to be formed is relatively long, as Figure 4 shown, the number of the holding-pressure air bags 30 can also be increased to three accordingly; or when the area of the battery pack 50 to be formed is relatively large, as Figure 5 shown, the number of the holding-pressure air bags 30 can also be increased to four accordingly. The number in this part can be adjusted according to the size and shape of the battery pack 50, and the present utility model does not specifically limit it.

[0043] In summary, the present utility model provides a pressure forming jig, which uses a holding-pressure air bag as a pressure source, enabling the pressure forming jig to perform the pressing and assembly of the battery pack outside the forming equipment first to form a clamping state, and then sending the pressure forming jig with the clamped battery pack to the forming equipment to perform relevant forming operations on the battery pack. Therefore, the present utility model can significantly improve the overall process productivity; at the same time, when there is an abnormality in the forming or testing equipment or when the equipment needs to be switched, the jig carrying the battery pack in a pressurized state can also quickly replace the equipment or process station, effectively improving the yield.

[0044] The above is only the preferred embodiment of the present utility model and is not intended to limit the scope of implementation of the present utility model. Therefore, all equivalent changes or modifications made according to the features and spirit described in the claims of the present utility model should be included within the scope of the patent application of the present utility model.

Claims

1. A pressure forming fixture, characterized in that, It includes: A bottom plate; At least one guide post, one end of which is fixedly arranged on the bottom plate; A mounting plate, fixedly arranged at the other end of the guide post and arranged in parallel with the bottom plate, and a space is formed between the bottom plate and the mounting plate; A pressing plate, movably arranged on the guide post, and dividing the space into a first space adjacent to the mounting plate and a second space adjacent to the bottom plate, and the second space can be provided with a battery pack; and At least one pressure-maintaining airbag, installed in the first space, capable of receiving an external air source and expanding, and pushing the pressing plate to move along the guide post towards the bottom plate to press the battery pack arranged in the second space, and can maintain the state of pressing the pressing plate when the external air source is cut off.

2. The pressure formation jig according to claim 1, characterized in that, One side of the pressure-maintaining airbag abuts against the mounting plate and the other side abuts against the pressing plate.

3. The pressure forming fixture according to claim 1, characterized in that, One side of the pressing plate facing the second space has an insulating pressing plate.

4. The pressure forming fixture according to claim 1, wherein One side of the bottom plate facing the second space has an insulating pressing plate.

5. The pressure forming fixture according to claim 1, characterized in that, One end of the bottom plate and the mounting plate has a base plate.

6. The pressure forming fixture according to claim 5, wherein, There are at least one heightening block on the base plate.

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