Lithium battery high precision cold pressing mold

Abstract

The utility model discloses a high-precision cold pressing mold for lithium batteries, comprising: a workbench, a lower mold assembly is arranged on the top of the workbench, an upper mold assembly is arranged above the lower mold assembly, the lower mold assembly comprises a lower mold, a mold cavity, a bottom hole, a scraper, a bottom plate, a bottom electric hydraulic cylinder, a glass plate and a guide rod, a mold cavity is arranged on the top of the lower mold, a bottom hole is arranged below the mold cavity, a scraper is arranged inside the bottom hole, the bottom of the scraper is fixedly connected to the bottom plate, the bottom of the bottom plate is fixedly connected to the bottom of the bottom plate, the bottom of the bottom electric hydraulic cylinder is fixedly connected to the lower mold, and a glass plate is fixedly connected to the front side wall of the lower mold. By arranging the bottom hole, the scraper, the bottom plate and the bottom electric hydraulic cylinder, when the cold pressing is completed, the bottom electric hydraulic cylinder is started, and the inner wall of the mold cavity can be cleaned in the process of ejecting the electrode sheet, so as to ensure the cleanliness of the mold cavity during the next cold pressing.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a high-precision cold pressing die for lithium batteries. Background Art

[0002] A cold pressing die is a die that places a metal blank into a mold cavity in a cold state and squeezes the metal out of the mold cavity through strong pressure and a certain speed to obtain an extruded part with the desired shape, size and mechanical properties. The electrode plates of lithium batteries are usually processed using cold pressing dies.

[0003] In the existing lithium battery cold pressing mold, there is a lack of detection equipment during the cold pressing process, which results in the need for re-testing of the cold pressed electrode sheets. Once the test fails, batches of electrode sheets are scrapped, resulting in waste. Utility Model Content

[0004] The utility model aims to provide a high-precision cold pressing mold for lithium batteries. When cold pressing is performed, a glass plate is arranged on the lower mold, and a scale is arranged on the glass plate, so that the thickness of the electrode sheet after cold pressing can be detected to ensure that the thickness of the electrode sheet after cold pressing is consistent. A pressure sensor is arranged at the bottom of the movable plate. During the cold pressing process, the pressure on each side between the movable plate and the lower mold can be monitored to ensure uniform cold pressing. The movable plate and the lower mold move up and down along the guide rod to ensure that the mold is not misaligned. After multiple monitoring, the accuracy of the electrode sheet after cold pressing can be improved. After the cold pressing is completed, the bottom electric hydraulic cylinder is started. In the process of ejecting the electrode sheet, the inner wall of the mold cavity can be cleaned to ensure the cleanliness of the mold cavity during the next cold pressing.

[0005] To achieve the above-mentioned purpose, a high-precision cold pressing mold for lithium batteries is provided, comprising: a workbench, a lower mold assembly is arranged on the top of the workbench, an upper mold assembly is arranged above the lower mold assembly, the lower mold assembly comprises a lower mold, a mold cavity, a bottom hole, a scraper, a bottom plate, a bottom electric hydraulic cylinder, a glass plate and a guide rod, a mold cavity is arranged on the top of the lower mold, a bottom hole is arranged below the mold cavity, a scraper is arranged inside the bottom hole, the bottom of the scraper is fixedly connected to the bottom plate, the bottom of the bottom plate is fixedly connected to the bottom electric hydraulic cylinder, the bottom of the bottom electric hydraulic cylinder is fixedly connected to the lower mold, and a glass plate is fixedly connected to the front side wall of the lower mold. The glass plate is provided with a scale, the top of the lower mold is fixedly connected with a guide rod, the number of the guide rods is set to four and symmetrically distributed on the top of the lower mold, the upper mold assembly includes a movable plate, an upper mold, a pressure sensor, a guide hole and a top electric hydraulic cylinder, the bottom of the movable plate is fixedly connected with the upper mold, the bottom of the movable plate is fixedly connected with a pressure sensor, the number of the pressure sensors is set to four and symmetrically distributed below the movable plate, the movable plate is provided with guide holes, the number of the guide holes is set to four and symmetrically distributed at the four corners of the movable plate, and the top of the movable plate is fixedly connected with a top electric hydraulic cylinder.

[0006] According to the high-precision cold pressing mold for lithium batteries, a back plate is fixedly connected to the rear side wall of the workbench, a top plate is fixedly connected to the top of the back plate, and a controller is fixedly connected to the front side wall of the top plate.

[0007] According to the high-precision cold pressing mold for lithium batteries, the bottom of the lower mold is fixedly connected to the workbench, and the top of the guide rod and the top electric hydraulic cylinder are both fixedly connected to the top plate.

[0008] According to the high-precision cold pressing mold for lithium batteries, the upper mold is located above the mold cavity, and the pressure sensor is located above the lower mold.

[0009] According to the high-precision cold pressing mold for lithium batteries, the glass plate is located above the scraper.

[0010] According to the high-precision cold pressing mold for lithium batteries, the guide rod is located inside the guide hole and is slidably connected to the movable plate.

[0011] According to the lithium battery high-precision cold pressing mold, the bottom electric hydraulic cylinder, the pressure sensor and the top electric hydraulic cylinder are all electrically connected to the controller.

[0012] According to the high-precision cold pressing mold for lithium batteries, the bottom of the workbench is fixedly connected with pillars, and the number of the pillars is set to four and symmetrically distributed at the four corners of the bottom of the workbench.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. By setting the lower mold, mold cavity, glass plate, guide rod, movable plate, upper mold, pressure sensor, guide hole and top electric hydraulic cylinder, during cold pressing, a glass plate is set on the lower mold, and a scale is set on the glass plate, which can detect the thickness of the electrode sheet after cold pressing to ensure that the thickness of the electrode sheet after cold pressing is consistent. A pressure sensor is set at the bottom of the movable plate. During the cold pressing process, the pressure on each side between the movable plate and the lower mold can be monitored to ensure uniform cold pressing. The movable plate and the lower mold move up and down along the guide rod to ensure that the mold is not misaligned. After multiple monitoring, the accuracy of the electrode sheet after cold pressing can be improved;

[0015] 2. By setting the bottom hole, scraper, bottom plate and bottom electric hydraulic cylinder, when the cold pressing is completed, the bottom electric hydraulic cylinder is started to clean the inner wall of the mold cavity during the process of ejecting the electrode sheet, so as to ensure the cleanliness of the mold cavity during the next cold pressing.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0018] Figure 1 This is the front view of the high-precision cold pressing die for lithium batteries of the utility model;

[0019] Figure 2 This is a cross-sectional view of the lower die assembly of the high-precision cold pressing die for lithium batteries of the utility model;

[0020] Figure 3 This is a cross-sectional view of the upper die assembly of the high-precision cold pressing die for lithium batteries of the utility model;

[0021] Figure 4 It is a side view of the high-precision cold pressing mold for lithium batteries of the utility model.

[0022] In the figure: 1. workbench; 2. lower mold assembly; 3. upper mold assembly; 4. back plate; 5. top plate; 6. controller; 7. pillar; 201. lower mold; 202. mold cavity; 203. bottom hole; 204. scraper; 205. bottom plate; 206. bottom electric hydraulic cylinder; 207. glass plate; 208. guide rod; 301. moving plate; 302. upper mold; 303. pressure sensor; 304. guide hole; 305. top electric hydraulic cylinder. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 4 The utility model provides a technical solution: a high-precision cold pressing mold for a lithium battery, comprising: a workbench 1, a lower mold assembly 2 is arranged on the top of the workbench 1, and an upper mold assembly 3 is arranged above the lower mold assembly 2.

[0025] The lower mold assembly 2 includes a lower mold 201, a mold cavity 202, a bottom hole 203, a scraper 204, a bottom plate 205, a bottom electric hydraulic cylinder 206, a glass plate 207 and a guide rod 208. The mold cavity 202 is arranged on the top of the lower mold 201, the bottom hole 203 is arranged below the mold cavity 202, the scraper 204 is arranged inside the bottom hole 203, the bottom of the scraper 204 is fixedly connected to the bottom of the bottom plate 205, the bottom of the bottom plate 205 is fixedly connected to the bottom electric hydraulic cylinder 206, the bottom of the bottom electric hydraulic cylinder 206 is fixedly connected to the lower mold 201, and when the bottom electric hydraulic cylinder 206 is started When the electrode sheet is pressed, the scraper 204 and the bottom plate 205 can be pushed upward to push the electrode sheet upward. At the same time, the inner wall of the mold cavity 202 is cleaned to remove the residue. A glass plate 207 is fixedly connected to the front side wall of the lower mold 201. A scale is set on the glass plate 207. The glass plate 207 is located above the scraper 204. The scale can detect whether the thickness of the electrode sheet is qualified after cold pressing. A guide rod 208 is fixedly connected to the top of the lower mold 201. There are four guide rods 208, which are symmetrically distributed on the top of the lower mold 201. The bottom of the lower mold 201 is fixedly connected to the workbench 1.

[0026] The upper mold assembly 3 includes a movable plate 301, an upper mold 302, a pressure sensor 303, a guide hole 304 and a top electric hydraulic cylinder 305. The bottom of the movable plate 301 is fixedly connected to the upper mold 302. The bottom of the movable plate 301 is fixedly connected to the pressure sensor 303. There are four pressure sensors 303, which are symmetrically distributed below the movable plate 301. When cold pressing is performed, the movable plate 301 is matched with the lower mold 201. The pressure sensor 303 can detect whether the pressure between the movable plate 301 and the lower mold 201 is uniform, thereby ensuring uniform cold pressing of the electrode sheet in the mold cavity 202. The movable plate 301 is provided with a guide hole 304. There are four guide holes 304, which are symmetrically distributed at the four corners of the movable plate 301. The top of the movable plate 301 is fixedly connected to the top electric hydraulic cylinder 305.

[0027] The upper mold 302 is located above the mold cavity 202, the pressure sensor 303 is located above the lower mold 201, the guide rod 208 is located inside the guide hole 304 and is slidably connected to the movable plate 301, and the movable plate 301 moves up and down along the guide rod 208 and is not easily misplaced.

[0028] A back plate 4 is fixedly connected to the rear side wall of the workbench 1, a top plate 5 is fixedly connected to the top of the back plate 4, the guide rod 208 and the top of the top electric hydraulic cylinder 305 are fixedly connected to the top plate 5, a controller 6 is fixedly connected to the front side wall of the top plate 5, and the bottom electric hydraulic cylinder 206, the pressure sensor 303 and the top electric hydraulic cylinder 305 are all electrically connected to the controller 6.

[0029] The bottom of the workbench 1 is fixedly connected with pillars 7 . There are four pillars 7 , which are symmetrically distributed at the four corners of the bottom of the workbench 1 .

[0030] Working principle: When cold pressing is performed, the electrode sheet is placed in the mold cavity 202, and the top electric hydraulic cylinder 305 is started to move the movable plate 301 downward along the guide rod 208, so that the upper mold 302 is pressed into the mold cavity 202, and the electrode sheet is cold pressed. The pressure sensor 303 under the movable plate 301 detects whether the pressure on the four sides is uniform, and the scale on the glass plate 207 detects whether the thickness of the electrode sheet after cold pressing is qualified. After the cold pressing is completed, the bottom electric hydraulic cylinder 206 is started to push the electrode sheet out of the mold cavity 202, and the scraper 204 is used to clean the inner wall of the mold cavity 202 to remove the residue.

[0031] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. High-precision cold pressing mold for lithium batteries, including: A workbench (1), characterized in that a lower mold assembly (2) is arranged on the top of the workbench (1), an upper mold assembly (3) is arranged above the lower mold assembly (2), the lower mold assembly (2) comprises a lower mold (201), a mold cavity (202), a bottom hole (203), a scraper (204), a bottom plate (205), a bottom electric hydraulic cylinder (206), a glass plate (207) and a guide rod (208), and the mold cavity (202) is arranged on the top of the lower mold (201). A bottom hole (203) is provided below the mold cavity (202), a scraper (204) is provided inside the bottom hole (203), the bottom of the scraper (204) is fixedly connected to a bottom plate (205), the bottom of the bottom plate (205) is fixedly connected to a bottom electric hydraulic cylinder (206), the bottom of the bottom electric hydraulic cylinder (206) is fixedly connected to the lower mold (201), and a glass plate (207) is fixedly connected to the front side wall of the lower mold (201). A scale is provided on the glass plate (207); a guide rod (208) is fixedly connected to the top of the lower mold (201); the guide rods (208) are provided in four numbers and are symmetrically distributed on the top of the lower mold (201); the upper mold assembly (3) comprises a movable plate (301), an upper mold (302), a pressure sensor (303), a guide hole (304) and a top electric hydraulic cylinder (305); the bottom of the movable plate (301) is fixedly connected to the upper mold (302); the bottom of the movable plate (301) is fixedly connected to the pressure sensor (303); the pressure sensor (303) is provided in four numbers and are symmetrically distributed below the movable plate (301); the movable plate (301) is provided with guide holes (304); the guide holes (304) are provided in four numbers and are symmetrically distributed at the four corners of the movable plate (301); and the top electric hydraulic cylinder (305) is fixedly connected to the top of the movable plate (301).

2. The high-precision cold pressing die for lithium batteries according to claim 1, characterized in that: A back plate (4) is fixedly connected to the rear side wall of the workbench (1), a top plate (5) is fixedly connected to the top of the back plate (4), and a controller (6) is fixedly connected to the front side wall of the top plate (5).

3. The high-precision cold pressing die for lithium batteries according to claim 2, characterized in that: The bottom of the lower mold (201) is fixedly connected to the workbench (1), and the top of the guide rod (208) and the top electric hydraulic cylinder (305) are both fixedly connected to the top plate (5).

4. The high-precision cold pressing die for lithium batteries according to claim 1, characterized in that: The upper mold (302) is located above the mold cavity (202), and the pressure sensor (303) is located above the lower mold (201).

5. The high-precision cold pressing die for lithium batteries according to claim 1, characterized in that: The glass plate (207) is located above the scraper (204).

6. The high-precision cold pressing die for lithium batteries according to claim 1, characterized in that: The guide rod (208) is located inside the guide hole (304) and is slidably connected to the movable plate (301).

7. The high-precision cold pressing die for lithium batteries according to claim 2, characterized in that: The bottom electric hydraulic cylinder (206), the pressure sensor (303) and the top electric hydraulic cylinder (305) are all electrically connected to the controller (6).

8. The high-precision cold pressing die for lithium batteries according to claim 1, characterized in that: The bottom of the workbench (1) is fixedly connected with pillars (7), and the number of the pillars (7) is four and they are symmetrically distributed at the four corners of the bottom of the workbench (1).

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