Lithium battery formation heating clamp and formation equipment

Abstract

The utility model relates to a lithium battery formation heating clamp and formation equipment. The lithium battery formation heating clamp and formation equipment comprise a tray, a plurality of partition plates, a drainage pipe and a drainage pipe, the multiple partition plates are arranged on the tray in parallel at intervals, a containing groove used for containing a lithium battery is formed between any two adjacent partition plates, the distance between any two adjacent partition plates can be adjusted so that the lithium battery can be restrained and pressed, a medium channel is formed in each partition plate, and a thermal medium flows in each medium channel. Two ends of the medium channel are respectively communicated with the drainage tube and the drainage tube. The thermal medium is used for heating the partition plate, then the partition plate is used for heating the lithium battery through heat conduction, and meanwhile, the temperature generated by lithium battery formation in the formation process is absorbed and taken away by the flowing thermal medium, so that the temperature of the battery is always uniform and consistent, and the consistency of the temperature of each point of the formation cabinet in the formation process is improved; and energy waste can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a lithium battery formation heating fixture and formation equipment. Background Art

[0002] In the production process of lithium-ion batteries, the formation process is one of the most critical processes. The formation process is the first small current charging of the newly manufactured lithium-ion battery. The purpose of charging is to form a layer of SEI film on the surface of the negative electrode. This SEI film has a significant impact on the performance of the lithium battery.

[0003] Currently, during the lithium battery formation stage, a high-temperature environment is mainly used to heat the lithium battery to meet the temperature requirements of the formation. However, this heating method has the problem of waste of resources and the problem of poor consistency due to the inability to control the temperature uniformity during the formation process. Utility Model Content

[0004] Based on this, in order to address the problem that the current method of using a high temperature environment to heat lithium batteries during the lithium battery formation stage wastes resources and the temperature uniformity during the formation process cannot be controlled, resulting in poor consistency, the utility model provides a lithium battery formation heating clamp and formation equipment.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model first provides a lithium battery formation heating fixture, which includes a tray, a plurality of partitions, a drainage pipe and a discharge pipe; the plurality of partitions are arranged in parallel and at intervals on the tray, a receiving groove for placing the lithium battery is formed between any two adjacent partitions, and the distance between any two adjacent partitions is adjustable so as to restrain and compress the lithium battery, each partition is provided with a medium channel and a heat medium flows in the medium channel, and the two ends of the medium channel are respectively connected to the drainage pipe and the discharge pipe.

[0007] The utility model heats the partition through a heat medium, and then uses the partition to heat the lithium battery through heat conduction. At the same time, the temperature generated by the lithium battery during the formation process is absorbed and taken away by the flowing heat medium, ensuring that the temperature of the battery is always uniform, thereby improving the consistency of the temperature at various points in the formation cabinet during the formation process and reducing energy waste.

[0008] As a further improvement of the above solution of the present invention, the partition is made of aluminum plate. Aluminum plate has good thermal conductivity, which can improve the heat conduction efficiency and ensure the temperature uniformity during the lithium battery formation process.

[0009] As a further improvement of the above solution of the present invention, the medium channels in each partition are arranged in a serpentine shape. The serpentine arrangement of the medium channels can increase the heating area of ​​the partition.

[0010] As a further improvement of the above-mentioned scheme of the present invention, the lithium battery formation heating clamp also includes two support groups, which are respectively arranged at the two ends of the length direction of the partition, each support group includes multiple support blocks, and the multiple support blocks are respectively arranged in one-to-one correspondence with the multiple partitions, and the side of the support block facing the corresponding partition is provided with a card groove adapted to the end of the partition, and the two ends of the partition are respectively clamped in the card grooves of the two support blocks; pipe joints are provided on the two support blocks, and the two pipe joints are respectively sealed and connected to the two ends of the medium channel of the partition, and the two pipe joints are respectively connected to the drainage pipe and the discharge pipe through hoses.

[0011] As a further improvement of the above-mentioned scheme of the present invention, the lithium battery formation heating clamp also includes a pressure plate and a driving member; each support group also includes a plurality of guide rods, and the plurality of guide rods slide through the plurality of support blocks of the support group and both ends of the guide rods are fixed on the tray; the pressure plate is arranged at one end of the support group and the pressure plate is parallel to the partition, the pressure plate contacts the support blocks at the ends of the two support groups and the two ends of the pressure plate are respectively slidably arranged on the guide rods of the two support groups; the driving member is used to drive the pressure plate to move along the extension direction of the guide rod.

[0012] As a further improvement of the above solution of the present invention, the heat medium is hot gas with a temperature of 45±3°C.

[0013] The utility model also provides a formation device, which comprises the lithium battery formation heating fixture as described above.

[0014] As a further improvement of the above-mentioned scheme of the present invention, it also includes a formation box, a lifting frame, a lifting mechanism and a probe assembly. The lifting frame is arranged in the formation box and is driven by the lifting mechanism to be lifted and lowered; the lithium battery formation heating clamp is arranged on the lifting frame and can be lifted and lowered as the lifting frame is lifted and lowered; the probe assembly is installed in the formation box and is located above the lifting frame. The probe assembly has a plurality of probes for contacting the tabs of the lithium battery.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model heats the partition through a heat medium, and then uses the partition to heat the lithium battery through heat conduction. At the same time, the temperature generated by the lithium battery during the formation process is absorbed and taken away by the flowing heat medium, ensuring that the temperature of the battery is always uniform, thereby improving the consistency of the temperature at various points in the formation cabinet during the formation process and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a lithium battery formation heating fixture proposed in an embodiment of the present utility model;

[0018] Figure 2This is a schematic structural diagram of a separator in a lithium battery formation heating fixture proposed in an embodiment of the present utility model;

[0019] Figure 3 A schematic structural diagram of a formation device proposed in an embodiment of the present utility model;

[0020] Figure 4 for Figure 3 Schematic diagram of part of the structure.

[0021] Figure numerals: 1. tray; 2. partition; 3. drainage tube; 4. discharge tube; 5. support block; 6. slot; 7. pipe joint; 8. pressure plate; 9. guide rod; 10. formation box; 11. lifting frame; 12. probe assembly; 13. hose. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] Reference Figure 1 、 Figure 2 This embodiment provides a formation device, including a lithium battery formation heating fixture, a formation box 10, a lifting frame 11, a lifting mechanism and a probe assembly 12.

[0025] A lifting frame 11 is disposed within the formation tank 10 and is driven by a lifting mechanism for elevation. A lithium battery formation heating fixture is disposed on the lifting frame 11 and can be raised and lowered as the lifting frame 11 is raised and lowered. A probe assembly 12 is mounted within the formation tank 10 and above the lifting frame 11. The probe assembly 12 comprises a plurality of probes for contacting the tabs of the lithium battery. In this embodiment, the lifting mechanism can be driven by a cylinder as is conventional in the art, and will not be described in detail here. The probe assembly 12 also utilizes conventional technology and will not be described in detail here.

[0026] Combine Figure 3 The lithium battery formation heating fixture of this embodiment includes a tray 1, multiple partitions 2, a drainage pipe 3 and a discharge pipe 4, and may also include two support groups, a pressing plate 8 and a driving member.

[0027] A plurality of partitions 2 are arranged in parallel and spaced apart on the tray 1, and a receiving groove for placing lithium batteries is formed between any two adjacent partitions 2. A medium channel is provided in each partition 2 and a heat medium flows in the medium channel. In order to improve the heating performance, in this embodiment, the partition 2 is made of aluminum plate. Of course, in other embodiments, the partition 2 can also be made of other materials with better thermal conductivity. The medium channels in the partition 2 are distributed in a serpentine shape, which can increase the heating area of ​​the partition 2. In this embodiment, combined with Figure 4 In order to facilitate processing and save processing costs, three transverse through holes are first opened along the width direction of the partition 2 and pass through the two ends of the length direction of the partition, and then longitudinal through holes are opened on the upper and lower sides of the partition 2 respectively, so that the two upper transverse through holes are connected and the two lower transverse through holes are also connected, thus forming a serpentine distribution of the medium channel, and then the ends of the lowermost transverse through hole and the uppermost transverse through hole that are away from each other are reserved as the inlet and outlet respectively, and the other outlets are blocked with plugs.

[0028] The heat medium in the medium channel of the partition 2 uses a hot gas with a temperature of 45±3°C. In this embodiment, the hot gas is hot nitrogen. Compared with the existing method of using hot water for circulation heating, the safety performance of this embodiment using hot nitrogen is much improved. This is because lithium batteries have strict requirements on moisture during the formation process, and the injection port of the lithium battery is open during formation. If hot water is used for circulation heating, once a leak occurs, it will seriously affect the performance of the lithium battery. At the same time, the use of hot water also has strict requirements on the sealing of the pipe connection, and the equipment requirements are relatively high. In this embodiment, hot nitrogen is used for circulation heating, which not only can heat the lithium battery well, but also the nitrogen can be recycled and reused in the vacuum break of formation. Nitrogen is an inert gas and is not easy to react with other media in the lithium battery. Leakage will not pollute the workshop environment. Of course, in other embodiments, the heat medium can also be hot inert gas or hot air.

[0029] The two support groups are arranged oppositely on both sides of the width direction of the partition 2. Each support group includes two guide rods 9 and multiple support blocks 5. The two guide rods 9 are arranged parallel to each other and both ends of the guide rods 9 are fixed on the tray 1. The multiple support blocks 5 of the support group are slidably mounted on the two guide rods 9. The multiple support blocks 5 of the support group are respectively arranged in a one-to-one correspondence with the multiple partitions 2. The side of the support block 5 facing the partition 2 is provided with a slot 6 that is adapted to the end of the partition 2. The two ends of the partition 2 are respectively snapped into the slots 6 of the corresponding two support blocks 5. A pipe joint 7 is horizontally provided through the support block 5. The pipe joints 7 on the two support blocks 5 corresponding to the partition 2 are respectively sealed and docked with the two ends of the medium channel inside the partition 2. The heat medium is introduced from one of the pipe joints 7, and the hot nitrogen in the medium channel is discharged from the other pipe joint 7, thereby realizing the circulation of the hot nitrogen in the partition 2.

[0030] A pressure plate 8 is disposed at one end of each of the two support groups, with both ends of the pressure plate 8 slidingly mounted on the guide rods 9 of the two support groups. The support blocks 5 at the ends of both support groups are in contact with the pressure plate 8. A driver is used to drive the pressure plate 8 to move. When the driver drives the pressure plate 8 toward the partition 2, the pressure plate 8 pushes the support blocks 5 to move, thereby driving the partition 2 to restrain and compress the lithium batteries between the partitions 2. In this embodiment, the driver can be driven by an existing pneumatic cylinder. The cylinder's telescopic rod is connected to the pressure plate 8, and the cylinder retracts and contracts to drive the pressure plate 8.

[0031] The drainage pipe 3 and the discharge pipe 4 are arranged on both sides of the tray 1 relatively. Multiple pipe joints 7 on one support group are connected to the drainage pipe 3 through a hose 13, and multiple pipe joints 7 on the other support group are connected to the discharge pipe 4 through a hose 13. The drainage pipe 3 is connected to the heat medium source, and the discharge pipe 4 is connected to the heat medium recovery device. The hot nitrogen enters the multiple partitions 2 from the drainage pipe 3 and is then recovered from the discharge pipe 4.

[0032] With the above structure, when the formation equipment of this embodiment is used, the lithium batteries to be formed are first placed in the receiving groove between two adjacent partitions 2, and the driving member drives the pressing plate 8 to move to restrain and clamp all the lithium batteries so that the lithium batteries are in full contact with the partitions 2; the lifting mechanism is activated to drive the lifting frame 11 to rise so that the positive and negative electrodes of the lithium batteries are in good contact with the probes; then the formation box 10 is closed, and hot nitrogen gas (the hot nitrogen gas temperature is controlled at 45±3°C) is introduced into the drainage tube 3 for heating and forming. The probe temperature detection data is passed through. After the battery temperature rises to a predetermined temperature, power is turned on for forming; after the formation is completed, the hot nitrogen gas source is cut off, and the lithium batteries can be removed after cooling.

[0033] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A lithium battery formation heating fixture, characterized in that: The invention comprises a tray (1), a plurality of partitions (2), a drainage pipe (3) and a discharge pipe (4); the plurality of partitions (2) are arranged on the tray (1) in parallel and at intervals; a receiving groove for placing lithium batteries is formed between any two adjacent partitions (2); and the distance between any two adjacent partitions (2) is adjustable so as to constrain and compress the lithium batteries; a medium channel is provided in each partition (2), and a heat medium flows in the medium channel; and both ends of the medium channel are respectively connected to the drainage pipe (3) and the discharge pipe (4).

2. The lithium battery formation heating fixture according to claim 1, characterized in that: The partition (2) is made of an aluminum plate.

3. The lithium battery formation heating fixture according to claim 1, characterized in that: The medium channels in each partition (2) are distributed in a serpentine shape.

4. The lithium battery formation heating fixture according to claim 1, characterized in that: The lithium battery formation heating fixture further comprises two support groups, the two support groups are respectively arranged at the two ends of the partition (2) in the longitudinal direction, each support group comprises a plurality of support blocks (5), and the plurality of support blocks (5) are respectively arranged in one-to-one correspondence with the plurality of partitions (2), a card slot (6) adapted to the end of the partition (2) is provided on the side of the support block (5) facing the corresponding partition (2), and the two ends of the partition (2) are respectively clamped in the card slots (6) of the two support blocks (5); both support blocks (5) are provided with pipe joints (7), the two pipe joints (7) are respectively sealed and docked with the two ends of the medium channel of the partition (2), and the two pipe joints (7) are respectively connected to the drainage pipe (3) and the discharge pipe (4) through the hose (13).

5. The lithium battery formation heating fixture according to claim 4, characterized in that: The lithium battery formation heating fixture further comprises a pressing plate (8) and a driving member; each support group further comprises a plurality of guide rods (9), the plurality of guide rods (9) all slide through a plurality of support blocks (5) of the support group, and both ends of the guide rods (9) are fixed on the tray (1); the pressing plate (8) is arranged at one end of the support group and the pressing plate (8) is parallel to the partition (2), the pressing plate (8) contacts the support blocks (5) at the ends of the two support groups, and both ends of the pressing plate (8) are respectively slidably arranged on the guide rods (9) of the two support groups; the driving member is used to drive the pressing plate (8) to move along the extension direction of the guide rods (9).

6. The lithium battery formation heating fixture according to claim 1, characterized in that: The heat medium is hot gas with a temperature of 45±3°C.

7. A chemical formation equipment, characterized in that: It comprises the lithium battery formation heating fixture according to any one of claims 1 to 6.

8. The chemical formation equipment according to claim 7, characterized in that: The invention also comprises a formation box (10), a lifting frame (11), a lifting mechanism and a probe assembly (12); the lifting frame (11) is arranged in the formation box (10) and is driven by the lifting mechanism to be lifted and lowered; a lithium battery formation heating fixture is arranged on the lifting frame (11) and can be lifted and lowered along with the lifting of the lifting frame (11); and the probe assembly (12) is installed in the formation box (10) and located above the lifting frame (11); the probe assembly (12) has a plurality of probes for contacting the tabs of the lithium battery.

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