Pre-sealing device and pre-sealing method for battery cap

Abstract

The invention provides a pre-sealing device and a pre-sealing method of a battery cap, the bottom end of a pre-sealing machine body is provided with an accommodating hole, the accommodating hole is used for placing a battery to be sealed, the pre-sealing machine body is also provided with a movable groove communicated with the accommodating hole, a pressing device comprises a top plate, a stop plate, a connecting column and an elastic piece, the top plate is fixed in the pre-sealing machine body, and the stop plate is fixed in the elastic piece. One end of the connecting column is connected with the top plate, the other end of the connecting column penetrates through the through hole, the elastic piece is arranged on the connecting column in a sleeving mode, one end of the elastic piece abuts against the top plate, and the other end of the elastic piece is connected with the stopping plate; the pre-sealing machine body can drive the top plate and the connecting column to move downwards and compress the elastic piece, so that one end of the connecting column exceeds the stopping plate, and then a cap in a steel shell of the battery is flattened through the connecting column. According to the invention, it is ensured that the cap is flush with the battery before sealing, abnormal sealing caused by unevenness of the cap is prevented, and the qualified rate of battery manufacturing can be improved.

Description

[Technical field]

[0001] The present invention relates to the technical field of batteries, and in particular to a pre-sealing device and a pre-sealing method for a battery cap. [Background technology]

[0002] Lithium batteries are widely used in modern life because of their high energy density, long cycle life, low self-discharge rate, low environmental impact, good battery safety and stability. These advantages make lithium batteries widely used in modern life. From mobile phones to laptops, to electric vehicles, they are inseparable from the technical support of lithium batteries. With the continuous development of lithium batteries, there will be many problems in the production process. Take the sealing process of quadrupole lug cylindrical battery cells as an example. The sealing process of quadrupole lug cylindrical battery cells requires the cap to be fixed after welding the lugs to complete the sealing. The cap is usually used as the positive terminal of the battery, providing a connection point between the battery and the external circuit to ensure the smooth flow of current. Its main function is to ensure the sealing of the electrolyte inside the battery to prevent electrolyte leakage, and also prevent external moisture or other impurities from entering the battery to ensure the purity of the internal environment of the battery. However, after the liquid injection and welding of the cap, the flatness of the cap cannot be guaranteed, and there will be uneven caps, which will lead to abnormal sealing and reduce the qualified rate of battery manufacturing.

[0003] In view of this, it is necessary to provide a novel pre-sealing device and pre-sealing method for a battery cap to overcome the above-mentioned defects. [Summary of the invention]

[0004] The object of the present invention is to provide a pre-sealing device and a pre-sealing method for a battery cap to solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present invention provides a pre-sealing device for a battery cap, comprising a pre-sealing machine body and a pressing device embedded in the pre-sealing machine body; a receiving hole is provided at the bottom end of the pre-sealing machine body, the receiving hole is used to place the battery to be sealed, and the pre-sealing machine body is also provided with a movable groove connected to the receiving hole; the pressing device comprises a top plate, a stop plate, a connecting column and an elastic member, the top plate is fixed in the pre-sealing machine body, the stop plate is received in the movable groove, the stop plate is provided with a through hole, one end of the connecting column is connected to the top plate, the other end of the connecting column passes through the through hole, the elastic member is sleeved on the connecting column, and one end of the elastic member abuts against the top plate, and the other end of the elastic member is connected to the stop plate; the pre-sealing machine body is used to drive the top plate and the connecting column to move downward and compress the elastic member, so that one end of the connecting column exceeds the stop plate, and then the cap in the steel shell of the battery is flattened through the connecting column.

[0006] In a preferred embodiment, the diameter of the movable groove is larger than the diameter of the receiving hole.

[0007] In a preferred embodiment, the diameter of the receiving hole is the same as the diameter of the steel shell of the battery.

[0008] In a preferred embodiment, the diameter of the through hole is the same as the diameter of the connecting column.

[0009] In a preferred embodiment, an annular protrusion is provided on the upper surface of the stop plate near the through hole, the elastic member is sleeved on the outside of the annular protrusion, and one end of the elastic member away from the top plate is fixedly connected to the annular protrusion.

[0010] In a preferred embodiment, the elastic member is a spring.

[0011] In a second aspect, the present invention further provides a pre-sealing method for a battery cap based on the pre-sealing device of the battery cap described in any one of the above, wherein the pre-sealing device comprises a pre-sealing machine body and a pressing device embedded in the pre-sealing machine body; a receiving hole is provided at the bottom end of the pre-sealing machine body, the receiving hole is used to place the battery to be sealed, and the pre-sealing machine body is also provided with a movable groove connected to the receiving hole; the pressing device comprises a top plate, a stop plate, a connecting column and an elastic member, the top plate is fixed in the pre-sealing machine body, the stop plate is received in the movable groove, the stop plate is provided with a through hole, one end of the connecting column is connected to the top plate, the other end of the connecting column passes through the through hole, the elastic member is sleeved on the connecting column, and one end of the elastic member abuts against the top plate, and the other end of the elastic member is connected to the stop plate;

[0012] The pre-sealing method comprises the following steps:

[0013] The batteries to be sealed are transferred into the receiving holes of the pre-sealing machine body;

[0014] Make sure the size of the push-down device matches the cap inside the battery steel shell;

[0015] Set the pressure value of the cap pressing device;

[0016] The pre-sealing machine body is driven to move downward to a specified position according to the pressure value; the pre-sealing machine body drives the top plate and the connecting column to move downward and compresses the elastic member, so that one end of the connecting column exceeds the stop plate, and then the cap in the steel shell of the battery is flattened through the connecting column.

[0017] In a preferred embodiment, it also includes: after the pre-sealing machine body moves downward to a specified position, the pre-sealing machine body is driven to move upward, the pre-sealing machine body drives the top plate and the connecting column to move upward and releases the elastic member, and the elastic member drives the stop plate to reset.

[0018] In a preferred embodiment, the method further comprises: after the stop plate is reset, the battery is moved out of the receiving hole, and then the battery is placed in an extrusion die and extruded and sealed so that the steel shell of the battery fits with the cap.

[0019] In a preferred embodiment, the pre-sealing machine body is driven by electricity.

[0020] Compared with the prior art, the present invention provides a pre-sealing device and a pre-sealing method for a battery cap. A receiving hole is provided at the bottom end of a pre-sealing machine body, and the receiving hole is used to place the battery to be sealed. The pre-sealing machine body is also provided with a movable groove connected to the receiving hole. The pressing device includes a top plate, a stop plate, a connecting column and an elastic member. The top plate is fixed in the pre-sealing machine body, and the stop plate is received in the movable groove. The stop plate is provided with a through hole. One end of the connecting column is connected to the top plate, and the other end of the connecting column passes through the through hole. The elastic member is sleeved on the connecting column, and one end of the elastic member abuts against the top plate, and the other end of the elastic member is connected to the stop plate. The pre-sealing machine body can drive the top plate and the connecting column to move downward and compress the elastic member, so that one end of the connecting column exceeds the stop plate, and then the cap in the steel shell of the battery is flattened through the connecting column, thereby ensuring that the cap and the battery are flush before sealing, preventing sealing abnormalities caused by uneven caps, and improving the qualified rate of battery manufacturing.

Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a structural diagram of the pre-sealing device of the battery cap provided by the present invention.

[0023] Figure 2 The structure diagram of the battery to be sealed.

[0024] Figure 3 This is a structural diagram of the pre-sealing device of the battery cap provided by the present invention when pressed down.

[0025] Figure 4 This is a structural diagram of the pressing device in the pre-sealing device of the battery cap provided by the present invention.

[0026] Figure 5 The present invention is a flowchart of the method for pre-sealing a battery cap. [Specific implementation method]

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0028] See also Figure 1 , which is a structural diagram of the battery cap pre-sealing device 100 provided by the present invention. The battery cap pre-sealing device 100 provided by the present invention improves the abnormal sealing caused by uneven cap during sealing after liquid injection. A cap pressing device is installed on the pre-sealing machine body to flatten the cap, thereby ensuring that the cap and the battery are flush before sealing, thereby improving the sealing qualification rate.

[0029] The battery cap pre-sealing device 100 comprises a pre-sealing machine body 10 and a pressing device 20 embedded in the pre-sealing machine body 10 .

[0030] The bottom end of the pre-sealing machine body 10 is provided with a receiving hole 101, and the receiving hole is used to place the battery 200 to be sealed. For details, please refer to Figure 2 The battery 200 includes a steel shell 201 with an opening at one end, a battery cell 202 accommodated in the steel shell, and a cap 203 arranged at the open end of the steel shell 201. The cap 203 is placed at one end of the steel shell 201 after the electrode ear is welded. The artificially placed cap cannot ensure flatness. Therefore, a pressing device is designed to flatten the cap before sealing.

[0031] Furthermore, the pre-sealing machine body 10 is also provided with a movable groove 102 connected to the receiving hole 101. The pressing device 20 includes a top plate 21, a stop plate 22, a connecting column 23 and an elastic member 24. The top plate 21 is fixed in the pre-sealing machine body 10. The stop plate 22 is received in the movable groove 102. The stop plate 22 is provided with a through hole 221. One end of the connecting column 23 is connected to the top plate 21, and the other end of the connecting column 23 passes through the through hole 221. The elastic member 24 is sleeved on the connecting column 23, and one end of the elastic member 24 abuts against the top plate 21, and the other end of the elastic member 24 is connected to the stop plate 22. Specifically, the elastic member 24 can be a spring, one end of the spring abuts against the top plate 21, and the other end of the spring is fixedly connected to the stop plate 22.

[0032] The pre-sealing machine body 10 is used to drive the top plate 21 and the connecting column 23 to move downward and compress the elastic member 24, so that one end of the connecting column 23 exceeds the stop plate 22, and then the cap 203 in the steel shell 201 of the battery is flattened through the connecting column 23. Specifically, flattening the cap means gently pressing the cap downward to make the plane where the cap is located parallel to the plane where the bottom surface of the steel shell is located, which is convenient for subsequent sealing.

[0033] It can be understood that the pre-sealing machine body 10 can be driven to move downward, driving the top plate 21 set in the pre-sealing machine body 10 and the connecting column 23 connected to the top plate 21 to move downward, and compressing the elastic member 24. The end of the connecting column 23 away from the top plate 21 can pass through the through hole 221 of the stop plate 22 and exceed the plane where the stop plate 22 is located, thereby achieving the goal of flattening the cap 203 in the steel shell 201 of the battery 200 through one end of the connecting column, preventing sealing abnormalities caused by uneven caps, and improving the qualified rate of battery manufacturing.

[0034] See also Figure 3 , which is a schematic diagram of the structure of the pre-sealing device of the battery cap provided by the present invention when it is pressed down. When the pre-sealing device is pressed down, the pre-sealing pole body outside the receiving hole 101 can clamp the steel shell 201 of the battery 200 to prevent the steel shell from moving during the pressing process. When the pre-sealing device is not pressed down, the stop plate 22 is located at the bottom of the movable groove 102. After the pre-sealing device is pressed down, the elastic member 24 is compressed, and the stop plate 22 is located at the top of the movable groove 102. The stop plate 22 can play a stopping role when the pre-sealing machine body 10 is pressed down to the specified position. The provision of the stop plate 22 can prevent the pre-sealing machine body from being over-pressed to cause damage to the cap. It can be understood that Figure 2 The structure shown is a schematic diagram of the pre-sealing device being pressed down to the extreme position. Different pressing pressures can be set for different batteries, which correspond to different pressing distances.

[0035] After the downward pressure is completed, the pre-sealing machine body 10 can be driven to move upward, driving the top plate 21 set in the pre-sealing machine body 10 and the connecting column 23 connected to the top plate 21 to move upward, and at the same time releasing the elastic member 24, the elastic member 24 can drive the stop plate 22 to reset, and the end of the connecting column 23 away from the top plate 21 is re-accommodated in the through hole 221 of the stop plate 22 and is flush with the plane where the stop plate 22 is located.

[0036] In some embodiments, the diameter of the movable groove 102 is larger than the diameter of the receiving hole 101, and the edge of the stop plate 22 abuts against the edge of the movable groove 102, which can play a stopping role when pressing down to prevent excessive pressing. The diameter of the receiving hole 101 is the same as the diameter of the steel shell 201 of the battery, and the battery 200 can abut against the edge of the receiving hole 101 to prevent the steel shell from being misplaced during the pressing process.

[0037] In some embodiments, the diameter of the through hole 221 is the same as the diameter of the connecting column 23, that is, the surface of the connecting column 23 is against the edge of the through hole 221. Such a design can play a guiding role when the connecting column 23 moves up and down, ensuring that the downward pressure is performed vertically.

[0038] See also Figure 4 In some embodiments, an annular protrusion 222 is provided on the upper surface of the stop plate 22 near the through hole 221, the elastic member 24 is sleeved on the outside of the annular protrusion 222, and the end of the elastic member 24 away from the top plate 21 is fixedly connected to the annular protrusion 222. The provision of the annular protrusion 222 can facilitate the fixed connection between the elastic member 24 and the stop plate 22 and prevent the elastic member from falling off.

[0039] It can be understood that in the pre-sealing device provided by the present invention, when the pre-sealing machine body 10 is pressed down, the only component of the pressing device is the stop plate 22 which is relatively displaced with the pre-sealing machine body 10, and the stop plate 22 is located inside the pre-sealing machine body 10, that is, the pre-sealing machine body 10 is pressed down as a whole, and the pressing is completed inside the pre-sealing machine body, which can avoid external interference and improve the accuracy of pressing.

[0040] The battery cap pre-sealing device 100 provided by the present invention flattens the cap before sealing the battery, and specifically comprises the following steps:

[0041] Step 1: Set the size of the cap pressing device to ensure it matches the cap model;

[0042] Step 2: Set the pressure of the cap pressing device;

[0043] Step 3: When the battery is pressed down by the pre-sealing device, the cap pressing device therein presses the cap flat, and the pre-sealing machine presses down by electricity. After pressing to the specified position, it rises by electricity. During this period, the pressing device will shrink by pressure. When the pre-sealing machine rises, the pressing device will recover under the action of the spring;

[0044] Step 4: After the cap is flattened, it is sealed and the steel shell and the cap are initially fitted together.

[0045] The pre-sealing device 100 of the battery cap provided by the present invention comprises a pre-sealing machine body 10 and a pressing device 20 embedded in the pre-sealing machine body 10. The bottom end of the pre-sealing machine body 10 is provided with a receiving hole 101, and the receiving hole is used to place the battery 200 to be sealed. The pre-sealing machine body 10 is also provided with a movable groove 102 connected to the receiving hole 101. The pressing device 20 comprises a top plate 21, a stop plate 22, a connecting column 23 and an elastic member 24. The top plate 21 is fixed in the pre-sealing machine body 10, and the stop plate 22 is received in the movable groove 102. The stop plate 22 is provided with a through hole 221 penetrating therethrough, and the connecting column 23 is provided with a through hole 221 penetrating therethrough. One end of the connecting column 23 is connected to the top plate 21, and the other end of the connecting column 23 passes through the through hole 221. The elastic member 24 is sleeved on the connecting column 23, and one end of the elastic member 24 is against the top plate 21, and the other end of the elastic member 24 is connected to the stop plate 22. The pre-sealing machine body 10 can drive the top plate 21 and the connecting column 23 to move downward and compress the elastic member 24, so that one end of the connecting column 23 exceeds the stop plate 22, and then the cap 203 in the steel shell 201 of the battery is flattened through the connecting column 23, so as to ensure that the cap and the battery are flush before sealing, prevent sealing abnormalities caused by uneven caps, and improve the qualified rate of battery manufacturing.

[0046] See also Figure 5 The present invention also provides a pre-sealing method for a battery cap based on the pre-sealing device for a battery cap according to any one of the above embodiments, the pre-sealing method comprising the following steps:

[0047] S10: transferring the battery to be sealed into the receiving hole of the pre-sealing machine body;

[0048] S20: Determine that the size of the pressing device matches the cap in the battery steel shell;

[0049] S30: Setting the pressure value of the cap pressing device;

[0050] S40: driving the pre-sealing machine body to move downward to a specified position according to the pressure value; the pre-sealing machine body drives the top plate and the connecting column to move downward and compresses the elastic member, so that one end of the connecting column exceeds the stop plate, and then the cap inside the steel shell of the battery is flattened by the connecting column.

[0051] In some embodiments, the pre-sealing method further includes: after the pre-sealing machine body moves downward to a specified position, driving the pre-sealing machine body to move upward, the pre-sealing machine body drives the top plate and the connecting column to move upward and releases the elastic member, and the elastic member drives the stop plate to reset.

[0052] In some embodiments, the pre-sealing method further comprises: after the stopper plate is reset, the battery is moved out of the receiving hole, and the battery is placed in an extrusion die for extrusion sealing, so that the steel shell of the battery fits the cap. Specifically, the pre-sealing machine is driven up and down by electricity.

[0053] It should be noted that all embodiments of the pre-sealing device for the battery cap provided by the present invention are applicable to the pre-sealing method for the battery cap provided by the present invention, and can achieve the same or similar technical effects, which will not be described one by one here.

[0054] In summary, the pre-sealing device 100 and the pre-sealing method of the battery cap provided by the present invention are as follows: the bottom end of the pre-sealing machine body 10 is provided with a receiving hole 101, the receiving hole is used to place the battery 200 to be sealed, the pre-sealing machine body 10 is also provided with a movable groove 102 connected to the receiving hole 101, the pressing device 20 includes a top plate 21, a stop plate 22, a connecting column 23 and an elastic member 24, the top plate 21 is fixed in the pre-sealing machine body 10, the stop plate 22 is received in the movable groove 102, the stop plate 22 is provided with a through hole 221, one end of the connecting column 23 is connected to the top plate 21, The other end of the connecting column 23 passes through the through hole 221, and the elastic member 24 is sleeved on the connecting column 23, and one end of the elastic member 24 is against the top plate 21, and the other end of the elastic member 24 is connected to the stop plate 22. The pre-sealing machine body 10 can drive the top plate 21 and the connecting column 23 to move downward and compress the elastic member 24, so that one end of the connecting column 23 exceeds the stop plate 22, and then the cap 203 in the steel shell 201 of the battery is flattened through the connecting column 23, thereby ensuring that the cap and the battery are flush before sealing, preventing sealing abnormalities caused by uneven caps, and improving the qualified rate of battery manufacturing.

[0055] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pre-sealing device for a battery cap, It is characterized in that The invention comprises a pre-sealing machine body and a pressing device embedded in the pre-sealing machine body; a receiving hole is provided at the bottom end of the pre-sealing machine body, the receiving hole is used to place the battery to be sealed, and the pre-sealing machine body is also provided with a movable groove connected to the receiving hole; the pressing device comprises a top plate, a stop plate, a connecting column and an elastic member, the top plate is fixed in the pre-sealing machine body, the stop plate is received in the movable groove, the stop plate is provided with a through hole, one end of the connecting column is connected to the top plate, the other end of the connecting column passes through the through hole, the elastic member is sleeved on the connecting column, and one end of the elastic member abuts against the top plate, and the other end of the elastic member is connected to the stop plate; the pre-sealing machine body is used to drive the top plate and the connecting column to move downward and compress the elastic member, so that one end of the connecting column exceeds the stop plate, and then the cap in the steel shell of the battery is flattened through the connecting column.

2. The pre-sealing device for the battery cap as claimed in claim 1, It is characterized in that The diameter of the movable groove is greater than the diameter of the receiving hole.

3. The pre-sealing device for the battery cap as claimed in claim 1, It is characterized in that The diameter of the receiving hole is the same as the diameter of the steel shell of the battery.

4. The pre-sealing device for the battery cap as claimed in claim 1, It is characterized in that The diameter of the through hole is the same as the diameter of the connecting column.

5. The pre-sealing device for the battery cap as claimed in claim 1, It is characterized in that An annular protrusion is arranged on the upper surface of the stop plate at a position close to the through hole, the elastic member is sleeved on the outer side of the annular protrusion, and one end of the elastic member away from the top plate is fixedly connected to the annular protrusion.

6. The pre-sealing device for the battery cap as claimed in claim 1, It is characterized in that The elastic member is a spring.

7. A method for pre-sealing a battery cap based on the battery cap pre-sealing device according to any one of claims 1 to 6, It is characterized in that The pre-sealing device comprises a pre-sealing machine body and a pressing device embedded in the pre-sealing machine body; a receiving hole is provided at the bottom end of the pre-sealing machine body, the receiving hole is used to place the battery to be sealed, and the pre-sealing machine body is also provided with a movable groove connected to the receiving hole; the pressing device comprises a top plate, a stop plate, a connecting column and an elastic member, the top plate is fixed in the pre-sealing machine body, the stop plate is received in the movable groove, the stop plate is provided with a through hole, one end of the connecting column is connected to the top plate, the other end of the connecting column passes through the through hole, the elastic member is sleeved on the connecting column, and one end of the elastic member abuts against the top plate, and the other end of the elastic member is connected to the stop plate; The pre-sealing method comprises the following steps: The batteries to be sealed are transferred to the receiving holes of the pre-sealing machine body; Make sure the size of the push-down device matches the cap inside the battery steel shell; Set the pressure value of the cap pressing device; The pre-sealing machine body is driven to move downward to a specified position according to the pressure value; the pre-sealing machine body drives the top plate and the connecting column to move downward and compresses the elastic member, so that one end of the connecting column exceeds the stop plate, and then the cap in the steel shell of the battery is flattened through the connecting column.

8. The method for pre-sealing a battery cap as claimed in claim 7, It is characterized in that Also includes: After the pre-sealing machine body moves downward to a specified position, the pre-sealing machine body is driven to move upward, and the pre-sealing machine body drives the top plate and the connecting column to move upward and release the elastic member, and the elastic member drives the stop plate to reset.

9. The method for pre-sealing a battery cap as claimed in claim 8, It is characterized in that Also includes: After the stop plate is reset, the battery is moved out of the receiving hole, and then the battery is put into the extrusion die and extruded and sealed, so that the steel shell of the battery fits with the cap.

10. The pre-sealing method of the battery cap according to claim 7, It is characterized in that The pre-sealing machine body is driven by electricity.

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