Integrated battery cell liquid injection mechanism

Abstract

The utility model belongs to the technical field of battery automatic production equipment, and particularly relates to an integrated battery cell liquid injection mechanism which comprises a vacuum liquid injection box, a liquid injection assembly, a heat sealing assembly and a positioning assembly, the liquid injection assembly, the heat sealing assembly and the positioning assembly are arranged in the vacuum liquid injection box, the vacuum liquid injection box comprises a cover body and a box body, the liquid injection assembly is arranged in the cover body in a penetrating mode, and the heat sealing assembly and the positioning assembly are arranged in the box body. The heat sealing assembly is arranged between the liquid injection assembly and the positioning assembly; the positioning assembly comprises a base and at least one battery cell fixing clamp, the base is provided with at least one battery cell fixing clamp, the two sides of the base are each provided with a positioning push rod, the positioning push rods are provided with limiting clamps, and the limiting clamps and the battery cell fixing clamps are oppositely arranged. Positioning, liquid injection vacuum and heat sealing functions are integrated to a single station, a battery cell fixing clamp and a limiting clamp of the positioning assembly are used for carrying out lossless positioning on a battery cell, then liquid injection, vacuum pumping and heat sealing procedures are sequentially carried out in the vacuum liquid injection box, and accurate positioning, efficient operation and yield improvement of the battery cell in the liquid injection procedure are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery automation production equipment, and in particular relates to an integrated battery core liquid injection mechanism. Background Art

[0002] Soft-pack power batteries can be composed of aluminum-plastic film, battery cells, positive and negative electrodes, and electrolyte. The traditional production process of soft-pack power lithium batteries is to use an injection machine to inject electrolyte into the aluminum-plastic film. The operation of the injection machine generally has three steps: positioning the incoming battery cells to ensure that the battery cells can smoothly enter the injection cavity and vacuum cavity; then accelerate the electrolyte infiltration and hot pressing sealing through injection and vacuuming; finally, the secondary positioning of the battery cells after injection to ensure that the battery cells can smoothly enter the unloading frame and be discharged. The above three steps need to be carried out at different workstations, with complicated processes and low efficiency. Moreover, the current positioning mainly relies on the cylinder-driven push rod to apply force to the top sealing edge to displace the battery cells, and the optical fiber sensing recognizes the top sealing edge to complete.

[0003] As the requirements for battery cell capacity and energy density increase, the weight of battery cells continues to increase. Excessive force exerted by the push rod on the top edge seal may cause the aluminum-plastic film to bend, resulting in failure of the secondary positioning of the battery cell, and position deviation and collision of the material into the frame, resulting in poor appearance and even affecting the flow of subsequent processes. Utility Model Content

[0004] The purpose of the utility model is to provide an integrated battery cell liquid injection mechanism to address the deficiencies in the prior art, which integrates positioning, liquid injection vacuum and heat sealing functions into one, thereby improving production efficiency and appearance quality, and has a broad application base.

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

[0006] An integrated battery cell injection mechanism comprises a vacuum injection box and an injection component, a heat sealing component and a positioning component therein, wherein the vacuum injection box comprises a cover body and a box body, the injection component is inserted into the cover body, the heat sealing component and the positioning component are arranged in the box body, and the heat sealing component is arranged between the injection component and the positioning component; the positioning component comprises a base and a battery cell fixing clip, at least one battery cell fixing clip is arranged on the base, a positioning push rod is respectively arranged on both sides of the base, a limiting clamp is arranged on the positioning push rod, and the limiting clamp is arranged opposite to the battery cell fixing clip.

[0007] Preferably, a push plate is fixedly connected between the positioning push rod and the limiting clamp, and at least one limiting clamp is provided on the push plate; the other end of the positioning push rod is drivingly connected to the driving cylinder.

[0008] Preferably, a first inclined surface is provided at the front end of the limiting clamp, and the first inclined surface is inclined toward the inside of the limiting clamp.

[0009] Preferably, a triangular block is provided at the connecting end of the battery cell fixing clip and the base.

[0010] Preferably, a second inclined surface is provided at the top of the battery cell fixing clip, and the second inclined surface inclines towards the inside of the battery cell fixing clip.

[0011] Preferably, the liquid injection assembly includes at least one liquid injection needle. The cover body is provided with a needle hole corresponding to the liquid injection needle. The liquid injection needle is inserted into the needle hole, and the front end of the liquid injection needle is disposed opposite to the positioning assembly.

[0012] Preferably, the heat sealing assembly includes a hot pressing head and a transmission track. Two relatively arranged hot pressing heads are provided above each positioning assembly, and the transmission track drives the hot pressing heads to approach each other or move away from each other in the reverse direction.

[0013] Preferably, a receiving groove is provided on the box body, and the transmission track is arranged in the receiving groove.

[0014] Preferably, a vacuum channel is provided through the box body, and the vacuum channel is used to externally connect a vacuum pump to perform vacuum pumping on the inside of the vacuum liquid injection box.

[0015] Preferably, a sealing ring is provided on one side of the box body where it is connected to the cover body.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: An integrated battery cell liquid injection mechanism provided by the present utility model integrates functions of positioning, liquid injection, vacuum, and heat sealing into a single station. The battery cell fixing clip and the limiting clip of the positioning assembly are used to perform non-destructive positioning on the battery cell, preventing positioning failure caused by excessive force bending of the aluminum-plastic film due to multiple positioning. Then, the liquid injection, vacuum pumping, and heat sealing processes are sequentially performed in the vacuum liquid injection box, realizing accurate positioning, efficient operation, and yield improvement of the battery cell during the liquid injection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model.

[0018] Figure 2 is a schematic diagram of the split structure of the present utility model.

[0019] Figure 3 is a schematic diagram of the structure of the heat sealing assembly of the present utility model.

[0020] Figure 4 is a schematic diagram of the structure of the positioning assembly of the present utility model.

[0021] Figure 5 is an assembly effect diagram of the positioning assembly and the battery cell of the present utility model.

[0022] Reference Numerals:

[0023] 1. Vacuum liquid injection box, 11. Cover body, 111. Pinhole, 12. Box body, 121. Accommodating groove, 122. Vacuum channel, 123. Sealing ring;

[0024] 2. Liquid injection assembly, 21. Liquid injection needle;

[0025] 3. Heat sealing assembly, 31. Hot pressing head, 32. Driving track;

[0026] 4. Positioning assembly, 41. Base, 42. Battery cell fixing clamp, 421. Second inclined surface, 422. Triangular block, 43. Positioning push rod, 44. Limiting clamp, 441. First inclined surface, 45. Push plate, 46. Driving cylinder. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figures 1-5 shown, an integrated battery cell liquid injection mechanism includes a vacuum liquid injection box 1 and a liquid injection assembly 2, a heat sealing assembly 3 and a positioning assembly 4 therein. The vacuum liquid injection box 1 includes a cover body 11 and a box body 12. The cover body 11 and the box body 12 can be hermetically connected. The connection method can be buckling through external fasteners, or pressing the cover body 11 tightly against the box body 12 by applying external pressure, or setting other convenient closing mechanisms for fitting and sealing to form a closed space for further vacuumizing the battery cell therein; the liquid injection assembly 2 penetrates through the cover body 11 and is inserted into the box body 12 to realize liquid injection for the battery cell in the box body 12; the heat sealing assembly 3 and the positioning assembly 4 are arranged in the box body 12. The heat sealing assembly 3 is arranged between the liquid injection assembly 2 and the positioning assembly 4. Specifically, the positioning assembly 4 is located at the bottom of the box body 12, and the heat sealing assembly 3 is arranged on the side of the box body 12 facing the cover body 11. All three are on the same vertical line. The liquid injection assembly 2 can penetrate through the heat sealing assembly 3 and extend to the position of the positioning assembly 4 to inject liquid into the battery cell on the positioning assembly 4;

[0029] The positioning component 4 includes a base 41 and a battery cell fixing clip 42. The base 41 is fixedly connected to the bottom of the box body 12. At least one battery cell fixing clip 42 is provided on the base 41. One positioning push rod 43 is provided on each side of the base 41. A limit clip 44 is provided on the positioning push rod 43. The limit clip 44 is arranged opposite to the battery cell fixing clip 42. In this embodiment, a total of four battery cell fixing clips 42 are provided on the base 41, with two as a group. Each group is used to clamp a battery cell to be processed. Two battery cells can be processed simultaneously on the same base 41. In more embodiments, it can be adjusted according to production requirements. For example, taking a single battery cell fixing clip 42 or three or more as a group, multiple groups of jigs are arranged on each bottom plate to process multiple battery cells simultaneously. The positioning push rod 43 is used to adjust the position of the battery cell in the battery cell fixing clip 42 to push it to a suitable liquid injection station. Limit clips 44 corresponding to the number of battery cell fixing clips 42 are provided on the positioning push rods 43 on the left and right sides of the base 41. The limit clips 44 on both sides of the battery cell cooperate with the battery cell fixing clip 42. During the operation of the positioning push rod 43, the top-sealed edge aluminum-plastic film enters the limit clip 44, which can effectively avoid positioning failure caused by the bending of the top-sealed edge due to excessive force of the positioning push rod 43. By installing a limit clip 44 on the traditional positioning push rod 43 and adjusting the push rod stroke, accurate positioning can be achieved without excessive adjustment of the structure of the existing positioning device.

[0030] Further, as Figures 4-5 shown, a push plate 45 is fixedly connected between the positioning push rod 43 and the limit clip 44. At least one limit clip 44 is provided on the push plate 45. The other end of the positioning push rod 43 is in transmission connection with a transmission cylinder 46. The transmission cylinder 46 drives the positioning push rod 43 and the push plate 45 thereon to move a fixed stroke, and the limit plate on the push plate 45 contacts the battery cell to push it to the liquid injection station.

[0031] Further, a first inclined surface 441 is provided at the front end of the limit clip 44. The first inclined surface 441 inclines towards the inside of the limit clip 44. Through the first inclined surface 441, the battery cell can be clamped more gently, avoiding damage to the aluminum-plastic film of the battery cell and improving the product yield.

[0032] Further, a triangular block 422 is provided at the connection end of the battery cell fixing clip 42 and the base 41. By using the triangular block 422, the battery cell in the battery cell fixing clip 42 can stably slide to the center position, facilitating the injection component 2 to insert into the air bag of the battery cell for liquid injection, with more accurate positioning and avoiding damage to the battery cell by the injection component 2.

[0033] Further, a second inclined surface 421 is provided at the top of the battery cell fixing clip 42. The second inclined surface 421 inclines towards the inside of the battery cell fixing clip 42. Through the second inclined surface 421, the battery cell can be sent into the battery cell fixing clip 42 more gently, avoiding damage to the aluminum-plastic film of the battery cell and improving the product yield.

[0034] Further, as Figure 2 shown, the liquid injection assembly 2 includes at least one liquid injection needle 21. The cover body 11 is provided with a needle hole 111 corresponding to the liquid injection needle 21. The liquid injection needle 21 is inserted into the needle hole 111. The front end of the liquid injection needle 21 is arranged opposite to the positioning assembly 4. The electrolyte is injected into the battery cell by inserting the liquid injection needle 21 into the battery cell. The liquid injection assembly 2 is externally connected with a liquid injection tank and a moving mechanism to control the insertion and lifting of the liquid injection needle 21.

[0035] Further, as Figure 3 shown, the heat sealing assembly 3 includes a hot pressing head 31 and a transmission track 32. There are two relatively arranged hot pressing heads 31 above the positioning assembly 4. The transmission track 32 drives the hot pressing heads 31 to approach each other or move away from each other in the opposite direction. In this embodiment, there are two groups of heat sealing assemblies 3 corresponding to the number of positioning assemblies 4. The transmission track 32 drives the two relatively placed hot pressing heads 31 in the heat sealing assembly 3. When the battery cell is placed, it is controlled to move away from each other outward. After the battery cell is filled with liquid, the liquid injection needle 21 is lifted upward and vacuum treatment is carried out. After the electrolyte infiltration is completed, the transmission track 32 controls the hot pressing heads 31 to close to the battery cell to achieve the sealing treatment.

[0036] Further, the box body 12 is provided with a receiving groove 121. The transmission track 32 is arranged in the receiving groove 121. Placing the transmission track 32 in the receiving groove 121 can make the structure of the box body 12 more compact, convenient to operate, and avoid unnecessary collisions of the battery cell.

[0037] Further, a vacuum channel 122 is penetrated through the box body 12. The vacuum channel 122 is used to externally connect a vacuum pump to evacuate the inside of the vacuum liquid injection box 1. When the vacuum liquid injection box 1 is closed, after the battery cell is filled with liquid by the liquid injection assembly 2, the gas in the box is evacuated by the vacuum pump to create a vacuum condition, so as to facilitate the acceleration of electrolyte infiltration.

[0038] Further, a sealing ring 123 is provided on one side of the box body 12 connected to the cover body 11. By using the sealing ring 123, the sealing performance of the vacuum liquid injection box 1 can be better. The sealing ring 123 can be adhered or embedded on the box body 12, and is in close fit with the box body 12 and the cover body 11 to prevent air leakage at their connection, which affects the vacuum pumping effect.

[0039] The specific working principle and process of the above-mentioned integrated battery cell liquid injection mechanism are as follows:

[0040] After the battery cell to be processed is conveyed from the previous station, the battery cell is taken out by the robotic arm and the vacuum chuck thereon, and transferred to the battery cell fixing clip 42 on the base 41. The positioning push rods 43 on the left and right sides approach the battery cell in the middle according to the set stroke. The battery cell is tightly pressed against the top-sealed edge aluminum-plastic film by the limiting clips 44 on both sides, realizing the precise positioning of the battery cell. Then, under the control of the closing mechanism outside, the cover body 11 of the vacuum liquid injection box 1 is closely attached to the box body 12. The moving mechanism outside the liquid injection assembly 2 extends the liquid injection needle 21 into the air bag of the battery cell to start liquid injection. After the liquid injection is completed, the needle retracts, and the vacuum pump is started to evacuate the vacuum liquid injection box 1 to accelerate the infiltration of the electrolyte in the battery cell. After the infiltration time, the transmission track 32 pushes the hot pressing head 31 to close to complete the hot pressing and sealing, realizing the entire positioning, vacuum liquid injection and heat sealing process. The operation is simple and convenient, and the degree of automation is high, which can greatly reduce the working steps and improve the production efficiency.

[0041] According to the disclosure and teachings of the above specification, those skilled in the art of the present invention can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the above specific embodiments. Any obvious improvements, substitutions or variations made by those skilled in the art on the basis of the present invention fall within the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. An integrated battery cell injection mechanism, characterized in that: It comprises a vacuum liquid injection box and a liquid injection component, a heat sealing component and a positioning component therein, the vacuum liquid injection box comprises a cover body and a box body, the liquid injection component is inserted into the cover body, the heat sealing component and the positioning component are arranged in the box body, and the heat sealing component is arranged between the liquid injection component and the positioning component; the positioning component comprises a base and a battery cell fixing clamp, at least one battery cell fixing clamp is arranged on the base, a positioning push rod is respectively arranged on both sides of the base, a limiting clamp is arranged on the positioning push rod, and the limiting clamp is arranged opposite to the battery cell fixing clamp.

2. The integrated battery cell liquid injection mechanism according to claim 1, characterized in that: A push plate is fixedly connected between the positioning push rod and the limiting clamp, and at least one limiting clamp is arranged on the push plate; the other end of the positioning push rod is drivingly connected to the driving cylinder.

3. The integrated battery cell liquid injection mechanism according to claim 2, characterized in that: A first inclined surface is disposed at the front end of the limiting clamp, and the first inclined surface is inclined toward the interior of the limiting clamp.

4. The integrated battery cell liquid injection mechanism according to claim 1, characterized in that: A triangular block is provided at the connecting end of the battery core fixing clip and the base.

5. The integrated battery cell liquid injection mechanism according to claim 4, characterized in that: A second inclined surface is disposed at the top of the battery cell fixing clip, and the second inclined surface is inclined toward the inside of the battery cell fixing clip.

6. The integrated battery cell liquid injection mechanism according to claim 1, characterized in that: The injection assembly includes at least one injection needle, the cover body is provided with a needle hole corresponding to the injection needle, the injection needle is inserted into the needle hole, and the front end of the injection needle is arranged opposite to the positioning assembly.

7. The integrated battery cell liquid injection mechanism according to claim 1, characterized in that: The heat sealing assembly includes a heat pressing sealing head and a transmission track. Two heat pressing sealing heads arranged opposite to each other are arranged above each positioning assembly. The transmission track drives the heat pressing sealing heads to move toward each other or away from each other.

8. The integrated battery cell liquid injection mechanism according to claim 7, characterized in that: The box body is provided with a containing groove, and the transmission crawler belt is arranged in the containing groove.

9. The integrated battery cell liquid injection mechanism according to claim 1, characterized in that: The box body is provided with a vacuum channel, and the vacuum channel is used for connecting an external vacuum pump to perform vacuum treatment on the inside of the vacuum liquid injection box.

10. The integrated battery cell liquid injection mechanism according to claim 1, characterized in that: A sealing ring is provided on one side where the box body and the cover body are connected.

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