Top cover assembly of battery and semi-finished battery
By installing a movable baffle structure on the battery cover and using an elastic torsion member to achieve automatic resetting of the baffle, the problem of leakage of battery filling hole during pre-charging is solved, improving the reliability and production efficiency of battery manufacturing process.
Patent Information
- Application Number
- CN202520016200.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-03
AI Technical Summary
The temporary rubber plug at the electrolyte filling hole of the battery is easily squeezed by the clamp during pre-charging, causing electrolyte to overflow. Existing technology cannot effectively avoid the overflow phenomenon.
A movable baffle structure is designed and installed at the liquid injection port of the cover plate. The baffle is automatically reset by the elastic restoring force of the elastic torsion member, ensuring that the liquid injection port remains sealed during battery precharging and preventing liquid leakage.
It effectively prevents liquid overflow during battery precharging, improves the reliability and production efficiency of battery manufacturing, and simplifies liquid filling and venting operations.
Smart Images
Figure CN223728939U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of battery, in particular to a top cover assembly of battery and a semi-finished battery. BACKGROUND
[0002] The injection hole of the battery is used for injecting electrolyte, and the battery is usually designed as a one-way valve structure at the injection hole, so that the electrolyte cannot flow out of the battery. After the battery is injected with electrolyte, the injection hole is usually temporarily sealed by a rubber plug. When the temporarily sealed battery is pressed by a clamp during pre-charging, the electrolyte in the battery can break through the temporary rubber plug and cause overflow. SUMMARY
[0003] The present application provides a top cover assembly of battery and a semi-finished battery, which can reduce the occurrence of overflow phenomenon in the battery manufacturing process.
[0004] A top cover assembly of battery, comprising:
[0005] a cover plate provided with an injection port;
[0006] a baffle, one end of the baffle being a connecting end and the other end being a free end, the connecting end being movably mounted at the injection port of the cover plate and connected to the cover plate for facing the inside of the battery, the baffle having an open position and a closed position, in the open position, the injection port is opened, in the closed position, the injection port is covered by the baffle.
[0007] Optionally, the connecting end is rotationally connected with the cover plate, and the rotation axis is parallel to the plane of the cover plate.
[0008] Optionally, the top cover assembly further comprises an elastic torsion member, the elastic torsion member connecting the cover plate and the baffle, and the baffle being reset from the open position to the closed position by the elastic restoring force of the elastic torsion member.
[0009] Optionally, one of the cover plate and the baffle is provided with a shaft hole, and the other is provided with a shaft body, the shaft hole and the shaft body being clearance fitted, the connecting end being rotationally connected with the cover plate at the shaft hole, and the elastic torsion member being sleeved outside the shaft body, and two torsion arms of the elastic torsion member abutting against the cover plate and the baffle, respectively.
[0010] Optionally, the elastic torsion member comprises a first elastic torsion member and a second elastic torsion member, the first elastic torsion member being sleeved outside the shaft body, two torsion arms of the first elastic torsion member abutting against the cover plate and the baffle, respectively, the second elastic torsion member being sleeved outside the shaft body, and two torsion arms of the second elastic torsion member abutting against the cover plate and the baffle, respectively.
[0011] Optionally, the free end is further provided with a connecting part, and in the closed position, the connecting part is connected with the cover plate.
[0012] Optionally, the connecting part is a magnetic part, and the cover plate is further provided with a magnetic matching part, and the magnetic part is attracted to the magnetic matching part.
[0013] Optionally, the side surface of the baffle plate facing the cover plate is further provided with a sealing rib, and in the closed position, the sealing rib is arranged around the liquid injection port and is clamped between the cover plate and the baffle plate.
[0014] Optionally, the liquid injection port is a circular port, and in the closed position, the center of the sealing rib coincides with the center of the liquid injection port, and the inner diameter of the sealing rib is at least 4 mm larger than the diameter of the liquid injection port.
[0015] A semi-finished battery comprises:
[0016] a shell;
[0017] a cell accommodated in the shell;
[0018] The top cover assembly according to any one of the preceding aspects is connected to the top of the shell and is sealingly connected with the shell.
[0019] The present application provides a top cover assembly of a battery and the battery, wherein the baffle plate is mounted on the side of the cover plate facing the inside of the battery, and the liquid injection port can be opened and closed, the electrolyte can be injected into the inside of the battery when the baffle plate is in the open position, and the liquid injection port can be sealed when the baffle plate is reset to the closed position, so that even if the battery is subjected to extrusion force during the pre-charging process, liquid overflow will not occur. Moreover, the baffle plate is provided with a free end, so that it is more convenient to move the baffle plate to the open position. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a schematic view of a top cover assembly of a battery according to an exemplary embodiment of the present application;
[0021] Figure 2 is Figure 1 is another schematic view of a top cover assembly of a battery according to an exemplary embodiment of the present application;
[0022] Figure 3 is a schematic view of a partial structure of a battery, wherein the baffle plate is in the closed position;
[0023] Figure 4 is a schematic view of a partial structure of a battery, wherein the baffle plate is in the open position;
[0024] Figure 5 is a view of the side of the top cover assembly facing the inside of the battery;
[0025] Figure 6 is Figure 5 an enlarged view of the A portion in
[0026] Figure 7 is a schematic view of the baffle plate.
[0027] Figure 8 is a sectional view of the cover plate.
[0028] Figure 9 is a schematic view of injecting electrolyte into the battery.
[0029] Figure 10 is a schematic view of the battery venting outwardly.
[0030] Figure 11 is a schematic view of the baffle plate welded to the cover plate.
[0031] Explanation of Reference Signs:
[0032] top cover assembly 100 of the battery; cover plate 10; liquid injection port 11; shaft body 12; magnetic matching member 13; baffle plate 20; connecting end 21; connecting member 211; free end 22; connecting portion 221; shaft hole 23; sealing rib 24; elastic torsion member 30; outer shell 200; liquid injection nozzle 300; air tube needle 400. DETAILED DESCRIPTION
[0033] The technical solutions in the embodiments (or, “modes of implementation”) of the present application will be described clearly and completely below with reference to the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.
[0034] If the present embodiments involve directional indications or positional relationships (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships, movement conditions, etc. between the components in a certain specific posture (as shown in the drawings); if the specific posture changes, the directional indications or positional relationships also change accordingly. In addition, the terms “first”, “second”, etc. in the present embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.
[0035] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic view of the top cover assembly 100 of the battery according to an exemplary embodiment of the present application. Figure 2 is Figure 1 is another schematic view of the top cover assembly 100 of the battery shown in is a schematic view of the top cover assembly 100 of the battery according to an exemplary embodiment of the present application.
[0036] The application provides a top cover assembly 100 of a battery, which comprises a cover plate 10 and a baffle 20. The cover plate 10 is provided with a liquid injection port 11 for injecting electrolyte, and the liquid injection port 11 penetrates the cover plate 10 in the thickness direction. The baffle 20 is movably installed at the liquid injection port 11 of the cover plate 10 and is connected to the cover plate 10 for the side facing the inside of the battery.
[0037] Please refer to Figure 3 and Figure 4 , Figure 4 Fig. 1 is a schematic view of a part of the structure of a battery, in which the baffle 20 is in the closed position. Figure 4 Fig. 2 is a schematic view of a part of the structure of a battery, in which the baffle 20 is in the open position.
[0038] One end of the baffle 20 is a connecting end 21, and the other end is a free end 22. The baffle 20 has an open position and a closed position. In the open position, the liquid injection port 11 is opened. Here, the "open position" means that the baffle 20 forms a gap with the cover plate 10 at the liquid injection port 11, and the degree of opening of the baffle 20 is not specifically limited. In the closed position, the liquid injection port 11 is covered by the baffle 20. In the covering state, the liquid injection port 11 can be sealed or not.
[0039] It should be further emphasized that the top cover assembly 100 is a semi-finished assembly, which is applied in the manufacturing process of the battery. After the battery is manufactured, the baffle 20 in the top cover assembly 100 remains relatively fixed with the cover plate 10, and the baffle 20 always seals the liquid injection port 11.
[0040] According to the above description, the baffle 20 is installed on the side of the cover plate 10 facing the inside of the battery, can open and close the liquid injection port 11, can inject electrolyte into the battery when the baffle 20 is in the open position, and can cover the liquid injection port 11 when the baffle 20 is reset to the closed position. Therefore, even if the battery is subjected to extrusion force during the pre-charging process, liquid overflow will not occur. Moreover, the baffle 20 is provided with a free end, so that it is more convenient for the baffle 20 to move to the open position.
[0041] In one embodiment, as shown in Figure 4 the connecting end 21 is rotationally connected with the cover plate 10, and the plane where the rotation shaft O is located is parallel to the plane where the cover plate 10 is located. In this way, the liquid injection nozzle can be inserted into the liquid injection port 11 while applying downward pressure to the baffle 20 to rotate the baffle 20 to the open position, without the need to open the baffle 20 in advance, so that the liquid injection operation is more quick and convenient. Moreover, the rotational connection structure is relatively simple and convenient to set.
[0042] Please refer to Figure 5 and Figure 6 ,Figure 5 is a view of the side of the top cover assembly 100 facing the inside of the battery. Figure 6 is a view of the side of the top cover assembly 100 facing the inside of the battery. Figure 5 is an enlarged view of the A portion in the middle.
[0043] In one embodiment, the top cover assembly 100 further comprises an elastic torsion member 30 connecting the cover plate 10 and the baffle plate 20, and the baffle plate 20 is reset from the open position to the closed position by the elastic restoring force of the elastic torsion member 30. The elastic torsion member 30 is an energy storage element, which stores energy when the baffle plate 20 is rotated to the open position by an external force, and releases energy to automatically reset the baffle plate 20 from the open position to the closed position when the external force is removed, facilitating the reset of the baffle plate 20. The elastic torsion member 30 includes but is not limited to a spiral spring and a torsion spring. Figure 6 In the embodiment shown, the elastic torsion member 30 is a torsion spring.
[0044] Please refer to Figure 7 and Figure 8 , Figure 7 is a schematic view of the baffle plate 20. Figure 8 is a sectional view of the cover plate 10.
[0045] In a specific embodiment, the cover plate 10 is provided with a shaft body 12, and the baffle plate 20 is provided with a shaft hole 23, the shaft body 12 and the shaft hole 23 are clearance fitted, and the baffle plate 20 is rotationally connected with the cover plate 10 through the cooperation of the shaft body 12 and the shaft hole 23. Among them, the torsion spring is sleeved on the shaft body 12, and the two torsion arms of the torsion spring abut against the cover plate 10 and the baffle plate 20 respectively, and the pre-tightening force of the torsion spring during installation can keep the baffle plate 20 in the closed position. The torsion spring structure is simple and convenient to install. For example, the diameter of the shaft hole 23 can be set to be at least 0.2mm larger than the diameter of the shaft body 12 to ensure smooth rotation of the shaft body 12 in the shaft hole 23.
[0046] In Figure 7 the embodiment shown, the connecting end 21 comprises two connecting members 211 spaced apart along the rotation axis direction of the baffle plate 20, and the connecting member 211 is provided with a shaft hole 23, and the two ends of the shaft body 12 are respectively inserted into the two shaft holes 23.
[0047] Please continue to refer to Figure 6In one embodiment, two torsion springs are provided, a first torsion spring and a second torsion spring. The first torsion spring is sleeved on the shaft body 12, and the two torsion arms of the first torsion spring abut against the cover plate 10 and the baffle plate 20 respectively. The second torsion spring is sleeved on the shaft body 12, and the two torsion arms of the second torsion spring abut against the cover plate 10 and the baffle plate 20 respectively. In this way, the two torsion springs are arranged side by side on the shaft body 12, which makes the force on the baffle plate 20 in the length direction of the shaft body 12 more balanced, and reduces the risk of deflection of the baffle plate 20 when it is reset. It should be noted that in other embodiments, the cover plate 10 can be provided with a shaft hole 23, and the baffle plate 20 can be provided with the shaft body 12.
[0048] In one embodiment, please refer to Figure 3 and Figure 7 , the free end 22 is further provided with a connecting portion 221, and the connecting portion 221 is connected with the cover plate 10 in the closed position. In this way, when the baffle plate 20 is in the closed position, the free end 22 is also connected with the cover plate 10, thereby improving the fit of the baffle plate 20 and the cover plate 10, reducing the gap between the baffle plate 20 and the cover plate 10, and ensuring that the baffle plate 20 can reliably seal the liquid inlet 11.
[0049] The connecting portion 221 can be an adhesive, including but not limited to double-sided tape. In this embodiment, the connecting portion 221 is a magnetic member, and the cover plate 10 is further provided with a magnetic matching member 13. The magnetic member and the magnetic matching member 13 are magnetically attracted and connected, and the connection method is simple and reliable. For example, the magnetic member includes a first magnetic pole, and the magnetic matching member 13 includes a second magnetic pole, and the polarities of the first magnetic pole and the second magnetic pole are different.
[0050] In one embodiment, please refer to Figure 7 , the side surface of the baffle plate 20 facing the cover plate 10 is further provided with a sealing rib 24, and the sealing rib 24 surrounds the liquid inlet 11 in the closed position, and the sealing rib 24 is clamped between the cover plate 10 and the baffle plate 20. In this way, in the closed position, the sealing rib 24 is sealed and combined with the edge of the liquid inlet 11 through clamping force, which can better seal the liquid inlet 11.
[0051] In a specific embodiment, the liquid inlet 11 is a circular port, and in the closed position, the center of the sealing rib 24 coincides with the center of the liquid inlet 11, and the inner diameter of the sealing rib 24 is at least 4 mm larger than the diameter of the liquid inlet 11. In this way, the sealing rib 24 is guaranteed to surround and seal the periphery of the liquid inlet 11, ensuring the reliability of the sealing.
[0052] In one embodiment, the connecting portion 221 and the sealing rib 24 are spaced apart by at least 1 mm.
[0053] In Figure 7In the shown embodiment, the connecting end 21 of the baffle 20 is a square end, the free end 22 is a 1 / 2 circle arc end, and the center of the sealing rib 24 also coincides with the center of the free end 22.
[0054] Please refer to Figure 3 The application also provides a semi-finished battery 1, which comprises the top cover assembly 100, the shell 200 and an electric core (not shown in the figure) described above. The electric core is accommodated in the shell 200, the top cover assembly 100 is connected to the top of the shell 200 and is in sealed connection with the shell 200. The battery 1 further comprises electrolyte, which is injected into the shell 200 through the injection port 11 and the electric core is immersed in the electrolyte. The battery includes but is not limited to a lithium battery. The battery 1 has the same technical effects as the top cover assembly 100, which will not be described here.
[0055] Please refer to Figure 9 , Figure 9 It is a schematic view of injecting electrolyte into the battery 1.
[0056] The injection nozzle 300 is pushed downward to open the baffle 20, and then the injection process can be started.
[0057] Please refer to Figure 10 , Figure 10 It is a schematic view of exhausting gas from the battery 1.
[0058] During the production of the battery 1, gas is generated in the battery 1. The baffle 20 can be pushed open by the gas tube needle 400, and the vacuum system can be used to exhaust gas from the battery 1, so that the exhaust process can be completed.
[0059] It should be noted that during the injection or exhaust process, the baffle 20 can be pushed open by the injection nozzle 300 or the gas tube needle 400, and the injection or exhaust process can be immediately performed, the interval time is short, compared with the scheme of temporarily plugging the injection port 11 by the temporary plug, the influence on the internal environment of the battery 1 is small, and the production efficiency of the battery 1 can be improved.
[0060] Please refer to Figure 11 , Figure 11 It is a schematic view of welding the baffle 20 to the cover plate 10.
[0061] The baffle 20 needs to be fixed before the battery 1 is shipped, for example, the baffle 20 can be welded to the cover plate 10.
[0062] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the scope of protection of the application.
Claims
1. A top cover assembly of a battery, characterized by comprising: The application relates to a top cover assembly of a battery, which comprises the following parts: a cover plate provided with a liquid injection port; a baffle plate, one end of which is a connecting end and the other end is a free end, the connecting end being movably mounted at the liquid injection port of the cover plate and connected to the cover plate for facing one side of the battery interior, the baffle plate having an open position and a closed position, in the open position, the liquid injection port being opened, and in the closed position, the liquid injection port being covered by the baffle plate.
2. The roof assembly of claim 1, wherein, The connecting end is rotationally connected to the cover plate, and the rotation axis is parallel to the plane of the cover plate.
3. The roof assembly of claim 2, wherein, The top cover assembly further comprises an elastic torsion member, which connects the cover plate and the baffle plate, and the baffle plate is reset from the open position to the closed position by the elastic restoring force of the elastic torsion member.
4. The roof assembly of claim 3, wherein, One of the cover plate and the baffle plate is provided with a shaft hole, and the other is provided with a shaft body, the shaft hole and the shaft body being gap-fitted, the connecting end being rotationally connected to the cover plate at the shaft hole, and the elastic torsion member being sleeved outside the shaft body, and two torsion arms of the elastic torsion member abutting against the cover plate and the baffle plate respectively.
5. The roof assembly of claim 4, wherein, The elastic torsion member comprises a first elastic torsion member and a second elastic torsion member, the first elastic torsion member being sleeved outside the shaft body, two torsion arms of the first elastic torsion member abutting against the cover plate and the baffle plate respectively, the second elastic torsion member being sleeved outside the shaft body, and two torsion arms of the second elastic torsion member abutting against the cover plate and the baffle plate respectively.
6. The roof assembly of any one of claims 2 to 5, wherein, The free end is further provided with a connecting part, and in the closed position, the connecting part is connected to the cover plate.
7. The roof assembly of claim 6, wherein, The connecting part is a magnetic part, and the cover plate is further provided with a magnetic matching part, the magnetic part and the magnetic matching part being attracted to each other.
8. The roof assembly of any one of claims 1 to 5, wherein, The side surface of the baffle plate facing the cover plate is further provided with a sealing rib, and in the closed position, the sealing rib is arranged around the liquid injection port and is clamped between the cover plate and the baffle plate.
9. The roof assembly of claim 8, wherein, The liquid injection port is a circular port, and in the closed position, the center of the sealing rib coincides with the center of the liquid injection port, and the inner diameter of the sealing rib is at least 4 mm larger than the diameter of the liquid injection port.
10. A semi-finished battery, characterized by The application further relates to a battery, which comprises the following parts: a shell; a battery core accommodated in the shell; the top cover assembly according to any one of claims 1 to 9, which is connected to the top of the shell and is sealingly connected to the shell.