Cover plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate structure and a battery, the cover plate structure comprises: a plate body, which is provided with a liquid injection hole; the insert is detachably connected with the liquid injection hole, a nail hole is formed in the insert in a penetrating mode, and the axis direction of the nail hole is parallel to the axis direction of the liquid injection hole; at least one locking part is arranged on the circumferential edge of the insert, and the insert has a movable state of being separated from the plate body and a locking state of enabling the locking part to be connected with the plate body in a locking mode. According to the cover plate structure provided by the utility model, the split type design is adopted, the quick mounting and dismounting of the insert and the plate body can be realized, the function of replacing a liquid injection hole by the insert is realized, the roundness can be better ensured, hole burrs are avoided, the risks of dislocation and size out-of-tolerance are reduced, the precision is higher, and the process maturation efficiency is high. The replacement and maintenance time is short, and the production and manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a cover plate structure and a battery. Background Art

[0002] The cell cover plate is often provided with a liquid injection hole for injecting electrolyte. In the related art, the cell cover plate is often integrally formed by stamping. During the stamping process, the die punch for stamping the liquid injection hole is a vulnerable part. After long-term use, it is easy to cause the roundness of the liquid injection hole to be difficult to guarantee, the hole burrs to appear, and the risks of dislocation and dimensional tolerance to be relatively high. Summary of the Utility Model

[0003] In view of this, the utility model provides a cover plate structure and a battery to solve the problems that the roundness of the liquid injection hole of the integrally formed stamping cell cover plate is difficult to guarantee and the hole burrs are easy to appear.

[0004] In a first aspect, the utility model provides a cover plate structure, including:

[0005] A plate body, on which a liquid injection hole is formed;

[0006] An insert, detachably connected to the liquid injection hole. The insert is formed with a nail hole, and the axial direction of the nail hole is parallel to the axial direction of the liquid injection hole;

[0007] At least one locking portion is arranged on the circumferential edge of the insert. The insert has a movable state of being disengaged from the plate body and a locking state of locking the locking portion to the plate body.

[0008] Beneficial effects: The cover plate structure provided by the embodiment of the utility model can realize the rapid installation and disassembly of the insert and the plate body by detachably connecting the insert to the liquid injection hole, adopting a split design, and arranging at least one locking portion on the circumferential edge of the insert. The insert has a movable state of being disengaged from the plate body and a locking state of locking the locking portion to the plate body. Thus, the function of the insert replacing the liquid injection hole can be realized. And due to the independent manufacturing of the insert, the roundness can be better guaranteed, the hole burrs can be avoided, the risks of dislocation and dimensional tolerance can be reduced, the precision is higher, the process is mature and the efficiency is high. The replacement and maintenance time is short, and the production and manufacturing cost is low.

[0009] In an optional embodiment, a locking step is formed by the inner circumferential surface of the liquid injection hole protruding towards the axial direction. A relief groove is formed locally on the locking step, and the relief groove penetrates the locking step along the axial direction;

[0010] The relief groove is adapted to form a relief for the axial movement of the locking portion.

[0011] Beneficial effects: When assembling the insert and the liquid injection hole, by aligning the locking part with the relief groove, since the relief groove is adapted to form a relief for the movement of the locking part along the axial direction, the locking part can pass through the relief groove, so that the locking part moves from one side of the locking step to the other side, and then the abutting part and the locking part are respectively located on both sides of the locking step along the axial direction. Subsequently, by rotating the insert around the axial direction, the locking part and the relief groove can be misaligned, preventing the locking part from disengaging from the relief groove along the axial direction. It is convenient to lock the insert on the plate body.

[0012] In an alternative embodiment, an abutting part is further formed on the circumferential edge of the insert. The abutting part and the locking part are arranged at intervals along the axial direction, and a clamping ring groove is formed in the area between the abutting part and the locking part along the axial direction.

[0013] In the locked state, the abutting part and the locking part are respectively located on both sides of the locking step along the axial direction, so that the locking step is embedded in the clamping ring groove.

[0014] Beneficial effects: The abutting part and the locking part are arranged at intervals along the axial direction, and a clamping ring groove is formed in the area between the abutting part and the locking part along the axial direction. In the locked state, the locking step is embedded in the clamping ring groove, so that the close fit between the insert and the plate body can be ensured, and the installation of the insert is guaranteed to be reliable.

[0015] In an alternative embodiment, the cover plate structure further includes: a sealing ring, which is sleeved in the clamping ring groove of the insert, and in the locked state, the sealing ring abuts between the locking step and the abutting part.

[0016] Beneficial effects: By providing a sealing ring, and in the locked state, the sealing ring abuts between the locking step and the abutting part, it can ensure that the gap between the insert and the liquid injection hole is in a sealed state, guarantee the sealing effect, and avoid liquid leakage.

[0017] In an alternative embodiment, the number of locking parts is multiple, and the multiple locking parts are arranged at intervals around the circumference of the insert.

[0018] The number of relief grooves is the same as the number of locking parts, and they are arranged in one-to-one correspondence.

[0019] Beneficial effects: The multiple locking parts are arranged at intervals around the circumference of the insert. When the insert is clamped with the plate body, it can achieve multi-point force application and ensure the connection effect.

[0020] In an alternative embodiment, along the axial direction of the nail hole, the thickness of the locking part is L, satisfying: 0.3mm < L < 1.5mm.

[0021] Beneficial effect: By limiting the lower limit of the thickness L of the locking portion, the structural strength of the locking portion can be ensured, the locking portion can be prevented from breaking, and the insert can be locked on the plate body. By limiting the upper limit of the thickness L of the locking portion, material waste caused by excessive thickness can be avoided, and the overall thickness of the insert along the axial direction can be avoided, thereby saving the size occupied by the cover plate structure along the axial direction and improving the overall energy density of the battery pack.

[0022] In an optional embodiment, the material of the insert is different from the material of the plate body, and the strength of the material of the insert is higher than the strength of the material of the plate body.

[0023] Beneficial effect: By making the strength of the material of the insert higher than the strength of the material of the plate body, the service life of the parts can be increased, the accuracy of the insert can be guaranteed, and the sealing nail can be better adapted.

[0024] In an optional embodiment, the insert further includes: a guide portion, which is arranged at a circumferential edge of the insert on a side away from the abutment portion along the axial direction.

[0025] Beneficial effect: By providing a guide portion on the circumferential edge of the insert away from the abutment portion along the axial direction, the insert can be guided by the guide portion when it is installed into the injection hole, thereby improving assembly efficiency, reducing the collision between the corners of the insert and the corners of the injection hole, and avoiding wear.

[0026] In an optional embodiment, the cover plate structure further includes:

[0027] A sealing nail, which is suitable for being installed in a nail hole to seal the nail hole;

[0028] The sealing nail cover is arranged on the plate body to limit the sealing nail from moving in the direction of escaping from the nail hole along the axial direction.

[0029] Beneficial effect: After the injection is completed, the sealing nail is installed in the nail hole to seal the nail hole, which can seal the nail hole and prevent leakage. The sealing nail cover and the sealing nail achieve double sealing to ensure the sealing effect, which is safer and more reliable.

[0030] In a second aspect, the utility model further provides a battery, comprising: the cover plate structure as described above.

[0031] Since the battery includes a cover plate structure, it has the same effect as the cover plate structure and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of the cover plate structure of the present utility model;

[0034] Figure 2 is Figure 1 partial enlarged view of;

[0035] Figure 3 Cross-sectional schematic diagram of the cover plate structure of the present utility model;

[0036] Figure 4 Cross-sectional view of the assembled state of the insert, sealing ring and plate body of the present utility model;

[0037] Figure 5 Cross-sectional view of the disassembled state of the insert, sealing ring and plate body of the present utility model;

[0038] Figure 6 Partial enlarged view of the bottom view of the plate body of the present utility model;

[0039] Figure 7 is Figure 3 enlarged view of part A in;

[0040] Explanation of reference numerals:

[0041] 1. Plate body; 11. Liquid injection hole; 12. Relief groove; 13. Locking step; 14. Support step;

[0042] 2. Sealing ring; 3. Insert; 31. Locking part; 32. Abutting part; 33. Guiding part; 34. Nail hole; 35. Snap ring groove;

[0043] 4. Sealing nail; 5. Sealing nail cover. Specific embodiments

[0044] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0045] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0046] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0048] The cell cover plate often has a liquid injection hole for injecting electrolyte. In the related art, the cell cover plate is often integrally formed by stamping. During the stamping process, the die punch for stamping the liquid injection hole is a vulnerable part. After long-term use, it is easy to make it difficult to ensure the roundness of the liquid injection hole, resulting in burrs on the hole and a relatively high risk of misalignment and dimensional tolerance.

[0049] The stamping die has a complex structure, high die repair difficulty, high cost, and high requirements for supporting equipment. Moreover, different product models require different specifications of dies, resulting in high production costs and a long production and manufacturing cycle of the dies.

[0050] In addition, when the cell cover plate is often integrally formed by stamping, taking the plate body made of aluminum as an example, it is easy to cause the local material strength around the liquid injection hole not to be improved and the wear risk is relatively high.

[0051] The cover plate structure provided by the embodiment of the present utility model, by adopting a split design, can ensure the roundness of the position of the liquid injection hole, avoid burrs on the hole, reduce the risk of misalignment and dimensional tolerance, has higher precision, mature technology and high efficiency. The replacement and repair time is short, and the production and manufacturing cost is low. Moreover, a material with better mechanical properties can be selected for the local area around the liquid injection hole to improve its precision and part life, and better adapt to the sealing rubber nails.

[0052] The following combinesFigures 1 to 7 , describe embodiments of the present utility model.

[0053] According to an embodiment of the present utility model, on the one hand, a cover plate structure is provided, including:

[0054] A plate body 1, on which a liquid injection hole 11 is provided;

[0055] An insert 3, detachably connected to the liquid injection hole 11, and a nail hole 34 is formed through the insert 3, and the axial direction of the nail hole 34 is parallel to the axial direction of the liquid injection hole 11;

[0056] At least one locking portion 31 is provided on the circumferential edge of the insert 3. The insert 3 has a movable state of being disengaged from the plate body 1 and a locking state of locking the locking portion 31 to the plate body 1.

[0057] In this embodiment, the plate body 1 can be made of a metal material, such as aluminum. The liquid injection hole 11 is provided on the plate body 1 and can be formed by stamping.

[0058] The insert 3, as an independent component, can be detachably connected to the liquid injection hole 11. The insert 3 can be assembled in the liquid injection hole 11, and a nail hole 34 is formed through the inside of the insert 3. Thus, during the liquid injection stage, the insert 3 is directly in contact with the liquid injection device, avoiding the contact between the liquid injection hole 11 and the liquid injection device, and preventing risks such as liquid injection failure or liquid leakage caused by factors such as insufficient roundness, burrs, misalignment, and dimensional tolerance of the liquid injection hole 11. And after the liquid injection is completed, the sealing nail 4 is installed in the nail hole 34 to block the nail hole 34, ensuring the installation accuracy of the sealing nail 4.

[0059] In order to facilitate the detachable connection between the insert 3 and the liquid injection hole 11, at least one locking portion 31 is provided on the circumferential edge of the insert 3. The insert 3 has a movable state of being disengaged from the plate body 1 and a locking state of locking the locking portion 31 to the plate body 1. Thus, it is convenient to install the insert 3 on the plate body 1, and when the insert 3 needs to be repaired or replaced, it can be quickly disassembled.

[0060] The cover plate structure provided by the embodiment of the present utility model, by setting the insert 3 to be detachably connected to the liquid injection hole 11, adopting a split design, and at least one locking portion 31 is provided on the circumferential edge of the insert 3. The insert 3 has a movable state of being disengaged from the plate body 1 and a locking state of locking the locking portion 31 to the plate body 1; thus, the quick installation and disassembly of the insert 3 and the plate body 1 can be realized, enabling the insert 3 to replace the function of the liquid injection hole 11, and due to the independent manufacturing of the insert 3, better roundness can be ensured, avoiding the occurrence of hole burrs, reducing the risks of misalignment and dimensional tolerance, with higher precision, mature process and high efficiency. The time for replacement and repair is short, and the production and manufacturing cost is low.

[0061] In some embodiments, in combination withFigure 2 , Figure 4 As shown in Figure 4 , a locking step 13 is formed by protruding the inner peripheral surface of the liquid injection hole 11 towards the axial direction. A relief groove 12 is formed locally on the locking step 13, and the relief groove 12 penetrates the locking step 13 along the axial direction;

[0062] The relief groove 12 is adapted to form a relief for the movement of the locking portion 31 along the axial direction.

[0063] In some embodiments, in combination with Figure 2 , Figure 4 As shown in Figure 4 , a contact portion 32 is further formed on the circumferential edge of the insert 3. The contact portion 32 and the locking portion 31 are arranged at intervals along the axial direction, and a clamping ring groove 35 is formed in the region between the contact portion 32 and the locking portion 31 along the axial direction;

[0064] In the locked state, the contact portion 32 and the locking portion 31 are respectively located on both sides of the locking step 13 along the axial direction, so that the locking step 13 is embedded in the clamping ring groove 35.

[0065] When the insert 3 is assembled with the liquid injection hole 11, by aligning the locking portion 31 with the relief groove 12, since the relief groove 12 is adapted to form a relief for the movement of the locking portion 31 along the axial direction, the locking portion 31 can pass through the relief groove 12, so that the locking portion 31 moves from one side of the locking step 13 to the other side, and then the contact portion 32 and the locking portion 31 are respectively located on both sides of the locking step 13 along the axial direction. Subsequently, by rotating the insert 3 around the axial direction, the locking portion 31 and the relief groove 12 can be misaligned, preventing the locking portion 31 from disengaging from the relief groove 12 along the axial direction. It is convenient to lock the insert 3 on the plate body 1.

[0066] The contact portion 32 and the locking portion 31 are arranged at intervals along the axial direction, and a clamping ring groove 35 is formed in the region between the contact portion 32 and the locking portion 31 along the axial direction; in the locked state, the locking step 13 is embedded in the clamping ring groove 35, so as to ensure the close fit between the insert 3 and the plate body 1 and ensure the reliable installation of the insert 3.

[0067] When the insert 3 needs to be disassembled, the insert 3 can be rotated around the axial direction to align the locking portion 31 with the relief groove 12, and the insert 3 can be pulled along the axial direction to enable the locking portion 31 to pass through the relief groove 12, thereby disassembling the insert 3.

[0068] In some embodiments, in combination with Figure 2 , Figure 3 , Figure 7 As shown in Figure 7 , the cover structure further includes: a sealing ring 2, the sealing ring 2 is sleeved in the clamping ring groove 35 of the insert 3, and in the locked state, the sealing ring 2 abuts between the locking step 13 and the contact portion 32.

[0069] By setting the sealing ring 2, and in the locked state, the sealing ring 2 abuts between the locking step 13 and the abutting portion 32, it can ensure that the gap between the insert 3 and the liquid injection hole 11 is in a sealed state, guarantee the sealing effect, and avoid liquid leakage.

[0070] In some embodiments, the number of the locking portions 31 is multiple, and the multiple locking portions 31 are arranged at intervals around the circumferential direction of the insert 3;

[0071] The number of the relief grooves 12 is the same as the number of the locking portions 31, and they are arranged in one-to-one correspondence.

[0072] The multiple locking portions 31 are arranged at intervals around the circumferential direction of the insert 3; when the insert 3 is clamped with the plate body 1, it can achieve multi-point force application and ensure the connection effect.

[0073] In this embodiment, the number of the locking portions 31 can be two, and the two locking portions 31 are symmetrically arranged. When the insert 3 is inserted into the plate body 1, the locking portions 31 pass through the relief grooves 12, and then the insert 3 is rotated around the axis direction, and the rotation angle is greater than 45° and less than 180°, so that the locking portions 31 can be misaligned with the relief grooves 12, preventing the locking portions 31 from disengaging from the relief grooves 12 along the axis direction. It is convenient to lock the insert 3 on the plate body 1.

[0074] In some embodiments, in combination Figure 5 As shown, along the axis direction of the nail hole 34, the thickness of the locking portion 31 is L, satisfying: 0.3 mm < L < 1.5 mm.

[0075] By limiting the lower limit of the thickness L of the locking portion 31, the structural strength of the locking portion 31 can be ensured, avoiding the fracture of the locking portion 31, and further ensuring that the insert 3 can be locked on the plate body 1. And by limiting the upper limit of the thickness L of the locking portion 31, the material waste caused by too thick thickness can be avoided, and the overall thickness of the insert 3 along the axis direction can be prevented from being too large, thereby saving the size occupation of the cover plate structure along the axis direction and improving the overall energy density of the battery pack.

[0076] In some embodiments, the material of the insert 3 is different from the material of the plate body 1, and the strength of the material of the insert 3 is higher than the strength of the material of the plate body 1.

[0077] In this embodiment, the material of the plate body 1 can be aluminum or aluminum alloy, etc., and the material of the insert 3 can be steel or steel alloy, etc.

[0078] By making the strength of the material of the insert 3 higher than the strength of the material of the plate body 1, the part life can be improved, the precision of the insert 3 can be ensured, and the sealing nail 4 can be better adapted.

[0079] In some embodiments, in combination Figure 4As shown, the insert 3 further includes: a guide portion 33 , which is arranged at a circumferential edge of the insert 3 on a side away from the abutment portion 32 along the axial direction.

[0080] In this embodiment, the guide portion 33 may be a chamfer or a rounded corner formed on the insert 3 .

[0081] By providing a guide portion 33 on the circumferential edge of the insert 3 away from the abutment portion 32 along the axial direction, the insert 3 can be guided by the guide portion 33 when it is installed into the injection hole 11, thereby improving the assembly efficiency, reducing the collision between the corners of the insert 3 and the corners of the injection hole 11, and avoiding wear.

[0082] In some embodiments, in combination Figure 3 , Figure 7 As shown, the cover plate structure also includes:

[0083] A sealing nail 4, which is suitable for being installed in the nail hole 34 to seal the nail hole 34;

[0084] The sealing nail cover 5 is disposed on the plate body 1 to limit the sealing nail 4 from moving in the direction of escaping from the nail hole 34 along the axial direction.

[0085] After the liquid injection is completed, the sealing nail 4 is installed in the nail hole 34 to block the nail hole 34, so as to seal the nail hole 34 and prevent liquid leakage.

[0086] A supporting step 14 is also formed on the plate body 1 . The supporting step 14 is formed by a local depression in the plate body 1 along the axial direction in a region surrounding the injection hole 11 . The supporting step 14 can be coaxially arranged with the locking step 13 .

[0087] The sealing nail cover 5 is arranged at the position of the supporting step 14 . In this embodiment, the sealing nail cover 5 is welded to the plate body 1 to limit the sealing nail 4 from moving in the direction of escaping from the nail hole 34 along the axial direction.

[0088] The sealing nail cover 5 and the sealing nail 4 realize double sealing, thereby ensuring the sealing effect, which is safer and more reliable.

[0089] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: the cover plate structure as described above.

[0090] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A cover plate structure, characterized in that: include: A plate body (1) having a liquid injection hole (11) formed thereon; An insert (3) is detachably connected to the injection hole (11), and a nail hole (34) is formed through the insert (3), and the axial direction of the nail hole (34) is parallel to the axial direction of the injection hole (11); At least one locking portion (31) is provided on the circumferential edge of the insert (3), and the insert (3) has an active state in which it can be disengaged from the plate body (1), and a locking state in which the locking portion (31) is locked and connected to the plate body (1).

2. The cover plate structure according to claim 1, characterized in that: The inner circumferential surface of the injection hole (11) is protruded toward the axial direction to form a locking step (13), and the locking step (13) is partially formed with a clearance groove (12), and the clearance groove (12) passes through the locking step (13) along the axial direction; The clearance groove (12) is suitable for providing clearance for the locking portion (31) to move along the axial direction.

3. The cover plate structure according to claim 2, characterized in that: The insert (3) is also provided with an abutment portion (32) on the circumferential edge thereof, the abutment portion (32) and the locking portion (31) are arranged at intervals along the axial direction, and a snap ring groove (35) is formed in the area between the abutment portion (32) and the locking portion (31) along the axial direction; In the locked state, the abutment portion (32) and the locking portion (31) are respectively located on both sides of the locking step (13) along the axial direction, so that the locking step (13) is embedded in the snap ring groove (35).

4. The cover plate structure according to claim 3, characterized in that: The cover plate structure further comprises: a sealing ring (2), wherein the sealing ring (2) is sleeved in the snap ring groove (35) of the insert (3), and in the locked state, the sealing ring (2) abuts between the locking step (13) and the abutting portion (32).

5. The cover plate structure according to claim 2, characterized in that: The number of the locking parts (31) is plural, and the plurality of locking parts (31) are arranged at intervals in the circumferential direction around the insert (3); The number of the clearance grooves (12) is the same as the number of the locking portions (31), and they are arranged in a one-to-one correspondence.

6. The cover plate structure according to any one of claims 1 to 5, characterized in that: Along the axial direction of the nail hole (34), the thickness of the locking portion (31) is L, satisfying the following relationship: 0.3 mm < L < 1.5 mm.

7. The cover plate structure according to any one of claims 1 to 5, characterized in that: The material of the insert (3) is different from the material of the plate body (1), and the strength of the material of the insert (3) is higher than the strength of the material of the plate body (1).

8. The cover plate structure according to claim 3, characterized in that: The insert (3) further comprises a guide portion (33), wherein the guide portion (33) is arranged on a circumferential edge of the insert (3) on a side away from the abutment portion (32) along the axial direction.

9. The cover plate structure according to any one of claims 1 to 5, characterized in that: The cover plate structure also includes: A sealing nail (4), wherein the sealing nail (4) is suitable for being installed in the nail hole (34) to seal the nail hole (34); A sealing nail cover (5) is provided on the plate body (1) to limit the sealing nail (4) from moving in a direction of escaping from the nail hole (34) along the axial direction.

10. A battery, characterized in that: It comprises the cover plate structure as claimed in any one of claims 1 to 9.

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