Battery cover plate assembly and battery

Abstract

The application relates to the technical field of secondary batteries, and discloses a battery cover plate assembly and a battery. The battery cover plate assembly comprises: an insulating plate, which is provided with a liquid injection hole; and a flow guide structure, which is detachably assembled at the position of the liquid injection hole, is provided with a through hole suitable for being in communication with the liquid injection hole along an axial direction, and is provided with at least one flow guide groove on a circumferential wall surface. The flow guide structure is suitable for selectively adjusting the liquid outlet direction of the flow guide groove. The battery cover plate assembly provided by the application can be tested and verified for multiple times after the primary insulating plate and the flow guide structure are manufactured during the battery development stage, the insulating plate does not need to be repeatedly manufactured, the development cost is greatly reduced, the flow guide structure can be conveniently replaced after the edge of the flow guide structure is abraded by a tool, the whole insulating plate does not need to be replaced, the later maintenance cost is greatly reduced, the insulating plate and the flow guide structure are in a split type, the material and the aperture size of the flow guide structure can be selected according to needs, and the use requirements of different working conditions can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary batteries, and in particular to a battery cover assembly and a battery. Background Art

[0002] Power batteries are widely used in electric vehicles and energy storage fields. As battery technology becomes increasingly mature, the requirements for battery performance and safety are increasing.

[0003] In existing technology, the lower plastic, which serves as insulation, is often made of injection-molded plastic, which has relatively low strength. The lower plastic is typically provided with an injection hole. During injection, a tooling is inserted into the hole, but this tooling wears the edge of the hole, making it a vulnerable area. If the hole is damaged, it cannot be replaced independently, requiring the entire lower plastic to be replaced.

[0004] Furthermore, during the injection process, the rapid flow of electrolyte can impact the electrode assembly, causing damage. Properly adjusting the electrolyte flow direction can reduce this impact, but during the battery development phase, each adjustment to the flow angle requires the production of a new lower plastic, resulting in high development costs. Summary of the Invention

[0005] In view of this, the present invention provides a battery cover assembly and a battery to solve the problem that the edge area of ​​the liquid injection hole of the lower plastic is easily worn, and each time the diversion angle is adjusted during the battery development stage, a new lower plastic needs to be produced, resulting in high development costs.

[0006] In a first aspect, the present invention provides a battery cover assembly, comprising:

[0007] an insulating plate having a liquid injection hole formed thereon;

[0008] The guide structure is detachably assembled at the position of the liquid injection hole, the guide structure is provided with a through hole in the axial direction suitable for conducting with the liquid injection hole, and the circumferential wall surface of the guide structure is provided with at least one guide groove;

[0009] The guide structure is suitable for selectively adjusting the liquid outflow direction of the guide groove.

[0010] Beneficial effects: By rationally adjusting the flow direction of the electrolyte, the impact on the electrode group can be reduced. In the battery development stage, in order to determine the optimal diversion angle for each battery device, multiple rounds of verification are required. The battery cover assembly provided by the embodiment of the present invention has a diversion structure suitable for selectively adjusting the liquid outlet direction of the diversion groove, thereby facilitating the adjustment of the diversion angle of the diversion groove. After the insulating plate and the diversion structure are made once, multiple tests and verifications can be carried out without repeatedly making the insulating plate, which greatly reduces the development cost. In addition, an injection hole is provided on the insulating plate, and the diversion structure is provided so that the diversion structure can be detachably assembled at the position of the injection hole. After the tooling causes wear to the edge of the diversion structure, it can be easily replaced without replacing the entire insulating plate, which greatly reduces the subsequent maintenance cost. The insulating plate and the diversion structure adopt a split structure. The material and aperture size of the diversion structure can be selected as needed to achieve state switching of the injection hole to meet the use requirements of different working conditions.

[0011] In an optional embodiment, the guide structure includes an overlapping portion, and a supporting portion is formed on the circumferential edge of the insulating plate located at the injection hole, and the supporting portion is suitable for supporting the overlapping portion.

[0012] Beneficial effect: By overlapping the overlapping part on the supporting part, the supporting part supports the overlapping part, so that the guide structure can be installed at the position where the injection hole is opened on the insulating plate, avoiding the guide structure from accidentally sliding into the inside of the battery cell.

[0013] In an optional embodiment, the guide structure is provided with a rotation-stopping portion on the circumferential outer surface of the overlap portion, and the insulating plate is provided with a rotation-stopping abutting portion surrounding the support portion, and the rotation-stopping portion matches the shape of the rotation-stopping abutting portion;

[0014] When the anti-rotation part cooperates with the anti-rotation abutment part, it is suitable for limiting the rotation of the guide structure around the axis; when the anti-rotation part is separated from the anti-rotation abutment part, it is suitable for rotating the guide structure to a preset angle, and by cooperating with the anti-rotation part again, the angle adjustment of the guide structure is achieved.

[0015] Beneficial effects: By adopting a rotation-stopping part and a rotation-stopping abutting part with matching shapes, the rotation of the guide structure around the axis can be restricted when the rotation-stopping part and the rotation-stopping abutting part cooperate with each other, thereby fixing the guide groove at a predetermined angle. Since the guide structure can be detachably assembled at the position of the liquid injection hole, the guide structure can be rotated to a preset angle by disassembling the guide structure, and the angle of the guide structure can be adjusted by re-cooperating the rotation-stopping part and the rotation-stopping abutting part. In this way, the angle adjustment can be achieved. During the battery development stage, after manufacturing the insulating plate and the guide structure once, multiple tests and verifications can be carried out without repeatedly manufacturing the insulating plate, which greatly reduces the development cost. In addition, it can ensure that the angle of the guide groove is in a specific position each time, avoiding the angle change caused by the contact between the liquid injection tooling and the guide structure, ensuring the accuracy of each angle, and ensuring that the test results are free of deviation.

[0016] In an optional embodiment, the anti-rotation portion includes a polygonal structure formed on the circumferential outer surface of the overlapping portion, the number of sides of the polygonal structure is N, and N≥3;

[0017] The anti-rotation abutting portion comprises a polygonal groove which is formed on the insulating plate and matches the polygonal structure.

[0018] Beneficial Effect: By adopting a polygonal structure, the circumferential outer surface of the overlap portion can be equally divided, ensuring that the angle of each rotation of the anti-rotation portion is accurate. The larger the number of sides of the polygonal structure, the smaller the angle of each rotation, thereby increasing the adjustment accuracy of the diversion structure.

[0019] In an optional embodiment, the polygonal structure is an equilateral polygon.

[0020] In an optional embodiment, the circumferential wall surface of the guide structure is provided with M guide grooves, and M≥2.

[0021] Beneficial effect: By reasonably setting the number of guide grooves opened on the circumferential wall of the guide structure and by setting the angle between adjacent guide grooves, the liquid discharge direction of the guide groove can be guaranteed, thereby facilitating the adjustment of the guide angle of the guide groove.

[0022] In an optional embodiment, a plurality of guide grooves are arranged at equal intervals around the circumferential wall of the guide structure.

[0023] In an optional embodiment, the opening length of the M guide grooves surrounding the circumferential wall of the guide structure is P, and the circumference of the circumferential wall of the guide structure is S, satisfying: 5%≤P / S≤50%.

[0024] In an optional embodiment, the material strength of the flow-guiding structure is greater than the material strength of the insulating plate.

[0025] Beneficial effect: By adopting a relatively high-strength guide structure in combination with the insulating plate, it is possible to take into account both cost and improve the structural performance of the injection position.

[0026] In a second aspect, the present invention further provides a battery comprising:

[0027] case;

[0028] And the battery cover assembly as described above is arranged on the opening of the shell.

[0029] Because the battery includes a battery cover assembly, it has the same effect as the battery cover assembly and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 Schematic diagram of the decomposed state of the battery of the present invention;

[0032] Figure 2 This is a front view schematic diagram of the insulating plate and the flow guide structure of the present invention;

[0033] Figure 3 for Figure 2 A partial enlarged view of

[0034] Figure 4 This is a schematic diagram of the back side of the insulating plate and the guide structure of the present invention;

[0035] Figure 5 for Figure 4 A partial enlarged view of

[0036] Figure 6 is a schematic diagram of the diversion structure of the present invention;

[0037] Figure 7 is a top view of the insulating board of the present invention;

[0038] Figure 8 for Figure 7 Schematic diagram of the BB section.

[0039] Description of reference numerals:

[0040] 1. Sealing plate; 2. Insulating plate; 21. Liquid injection hole; 22. Anti-rotation abutment portion; 23. Support portion; 3. Shell; 4. Diversion structure; 41. Anti-rotation portion; 42. Diversion groove; 43. Through hole; 44. Overlap portion. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] The following combination Figures 1 to 8 , describing embodiments of the present invention.

[0046] According to an embodiment of the present invention, on the one hand, a battery cover assembly is provided, comprising:

[0047] The insulating plate 2 is provided with a liquid injection hole 21;

[0048] The guide structure 4 is detachably assembled at the position of the liquid injection hole 21. The guide structure 4 is provided with a through hole 43 in the axial direction suitable for communicating with the liquid injection hole 21. The circumferential wall surface of the guide structure 4 is provided with at least one guide groove 42.

[0049] The guide structure 4 is suitable for selectively adjusting the liquid outflow direction of the guide groove 42 .

[0050] The battery cover assembly includes a sealing plate 1 and an insulating plate 2. The sealing plate 1 is welded to the housing 3 to seal the battery cell. The interior of the battery cell is suitable for accommodating the electrode group. By placing the insulating plate 2 between the electrode group and the sealing plate 1, it provides insulation and support, ensuring an exhaust channel between the electrode group and the sealing plate 1. This allows gases to escape through the exhaust channel and ultimately out of the explosion-proof valve in the event of thermal runaway.

[0051] The sealing plate 1 can be made of a plain aluminum sheet, and the insulating plate 2 can be made of plastic.

[0052] During the injection process, rapidly injected electrolyte can impact the electrode assembly, causing damage. Properly adjusting the electrolyte flow direction can reduce the impact on the electrode assembly. During the battery development phase, multiple rounds of verification are required to determine the optimal diversion angle for each battery device. The battery cover assembly provided by the embodiments of the present invention has a diversion structure 4 suitable for selectively adjusting the liquid outlet direction of the diversion groove 42, thereby facilitating adjustment of the diversion angle of the diversion groove 42. This allows for multiple test verifications after the insulating plate 2 and diversion structure 4 are fabricated once, eliminating the need for repeated fabrication of the insulating plate 2 and significantly reducing development costs.

[0053] In addition, the battery cover assembly provided by the embodiment of the present invention has an injection hole 21 on the insulating plate 2, and by providing a guide structure 4, the guide structure 4 can be detachably assembled at the position of the injection hole 21, so that after the tooling causes wear to the edge of the guide structure 4, it can be easily replaced without replacing the entire insulating plate 2, thereby greatly reducing the subsequent maintenance cost.

[0054] At the same time, the insulating plate 2 and the guide structure 4 adopt a split structure. The material and aperture size of the guide structure 4 can be selected as needed to achieve state switching of the injection hole to meet the use requirements of different working conditions.

[0055] In addition, the insulating plate 2 is made of plastic injection molding, which has low material strength and low cost. By using a high-strength guide structure 4 to cooperate with the insulating plate 2, it is possible to balance cost and improve the structural performance of the injection position.

[0056] In some embodiments, the material strength of the flow-guiding structure 4 is greater than the material strength of the insulating plate 2 .

[0057] Optionally, the insulating plate 2 may be made of plastic, such as PC, PPS, etc.; the guide structure 4 may be made of resin, which has properties such as wear resistance and insulation.

[0058] By providing at least one guide groove 42 on the circumferential wall of the guide structure 4 and rationally adjusting the liquid outlet direction of the guide groove 42, the electrolyte flow can be precisely diverted, thereby better protecting the electrode group, reducing the impact of the injection process on the electrode group, and improving the safety of the battery cell.

[0059] In some embodiments, combined Figure 3 、 Figure 6 As shown, the guide structure 4 includes an overlap portion 44 , and the insulating plate 2 is formed with a support portion 23 at the circumferential edge of the liquid injection hole 21 , and the support portion 23 is suitable for supporting the overlap portion 44 .

[0060] By overlapping the overlapping portion 44 on the supporting portion 23, the supporting portion 23 supports the overlapping portion 44, so that the guide structure 4 can be installed at the position where the injection hole 21 is opened on the insulating plate 2, avoiding the guide structure 4 from accidentally sliding into the interior of the battery cell.

[0061] Combined with Figure 8 As shown, after the overlapping portion 44 is overlapped on the support portion 23, the upper surface of the overlapping portion 44 is not higher than the upper surface of the insulating plate 2, so that after the insulating plate 2 and the sealing plate 1 are assembled, the sealing plate 1 can avoid excessive extrusion of the guide structure 4, thereby ensuring the sealing effect.

[0062] In some embodiments, combined Figure 3 、 Figure 6 As shown, the guide structure 4 is formed with a rotation-stopping portion 41 on the circumferential outer surface of the overlap portion 44, and the insulating plate 2 is formed with a rotation-stopping abutting portion 22 around the support portion 23, and the rotation-stopping portion 41 matches the shape of the rotation-stopping abutting portion 22;

[0063] When the anti-rotation part 41 cooperates with the anti-rotation abutment part 22, it is suitable for limiting the rotation of the guide structure 4 around the axis; when the anti-rotation part 41 is separated from the anti-rotation abutment part 22, it is suitable for rotating the guide structure 4 to a preset angle, and by re-cooperating with the anti-rotation part 41 and the anti-rotation abutment part 22, the angle adjustment of the guide structure 4 is achieved.

[0064] By employing a matching anti-rotation portion 41 and an anti-rotation abutment portion 22, the anti-rotation portion 41 and the anti-rotation abutment portion 22 can restrict the flow guide structure 4 from rotating about its axis, thereby fixing the flow guide groove 42 at a predetermined angle. Because the flow guide structure 4 can be detachably assembled at the position of the liquid injection hole 21, the flow guide structure 4 can be disassembled and rotated to a preset angle. The angle of the flow guide structure 4 can then be adjusted by re-engaging the anti-rotation portion 41 and the anti-rotation abutment portion 22. This allows for angle adjustment, allowing multiple tests and verifications to be conducted during the battery development phase after the insulating plate 2 and the flow guide structure 4 are fabricated once, eliminating the need for repeated fabrication of the insulating plate 2 and significantly reducing development costs. Furthermore, the angle of the flow guide groove 42 can be guaranteed to be at a specific position each time, preventing the angle from changing when the injection tooling contacts the flow guide structure 4, ensuring the accuracy of each angle and the accuracy of the test results.

[0065] As an optional implementation form, the anti-rotation portion 41 can be a protrusion formed on the overlapping portion 44; the corresponding anti-rotation abutment portion 22 can be a plurality of grooves opened on the support portion 23, and angle adjustment can be achieved through selective cooperation between the grooves and the protrusions.

[0066] In some embodiments, the anti-rotation portion 41 includes a polygonal structure formed on the circumferential outer surface of the overlap portion 44 , and the number of sides of the polygonal structure is N, and N≥3;

[0067] The anti-rotation abutment portion 22 includes a polygonal groove formed on the insulating plate 2 and adapted to the polygonal structure.

[0068] In some embodiments, the polygonal structure is an equilateral polygon.

[0069] Alternatively, a polygonal structure can be used to equally divide the circumferential outer surface of the overlap portion 44. For example, if the polygonal structure has three sides, the flow guide structure 4 rotates 120 degrees each time. Alternatively, if the polygonal structure has six sides, the flow guide structure 4 rotates 60 degrees each time. This ensures that the rotation stop 41 rotates accurately each time.

[0070] Optionally, the number of sides of the polygonal structure can be 3, 4, 5, 6, 7, 8, etc.

[0071] When the number of sides of the polygonal structure is larger, the angle of each rotation is smaller, thereby making the adjustment accuracy of the guide structure 4 higher.

[0072] In some embodiments, combined Figure 5 、 Figure 6 As shown, the circumferential wall surface of the guide structure 4 is provided with M guide grooves 42 , and M≥2 is satisfied.

[0073] By reasonably setting the number of guide grooves 42 opened on the circumferential wall of the guide structure 4 and by setting the angle between adjacent guide grooves 42 , the liquid discharge direction of the guide groove 42 can be ensured, thereby facilitating the adjustment of the guide angle of the guide groove 42 .

[0074] By reasonably selecting the number of sides N of the polygonal structure of the anti-rotation portion 41, as well as the number and angle of the guide grooves 42, various combinations of insulating plates 2 of different specifications and guide structures 4 of different specifications can be achieved, thereby facilitating the production of fewer insulating plates 2 and guide structures 4 during the battery development stage, allowing for more test verifications, improving test efficiency, and reducing development costs.

[0075] In some embodiments, a plurality of guide grooves 42 are arranged at equal intervals around the circumferential wall of the guide structure 4 .

[0076] In some embodiments, the opening length of the M guide grooves 42 surrounding the circumferential wall of the guide structure 4 is P, and the circumference of the circumferential wall of the guide structure 4 is S, satisfying: 5%≤P / S≤50%.

[0077] By limiting the upper limit of the ratio of the opening length of the guide groove 42 to the circumference of the circumferential wall of the guide structure 4, a decrease in structural strength caused by a large number of guide grooves 42 can be avoided. Furthermore, by limiting the lower limit of the ratio of the opening length of the guide groove 42 to the circumference of the circumferential wall of the guide structure 4, the guiding effect of the guide groove 42 can be guaranteed.

[0078] According to another aspect of an embodiment of the present invention, a battery is provided, comprising:

[0079] Shell 3;

[0080] And the battery cover assembly as described above is arranged on the opening of the shell 3.

[0081] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A battery cover assembly, characterized in that: include: Sealing plate; An insulating plate is provided between the electrode group and the sealing plate, and a liquid injection hole is provided on the insulating plate; A flow guide structure is detachably assembled at the position of the liquid injection hole, wherein the flow guide structure is provided with a through hole in the axial direction suitable for communicating with the liquid injection hole, and the circumferential wall surface of the flow guide structure is provided with at least one flow guide groove; The guide structure is suitable for selectively adjusting the liquid outflow direction of the guide groove; the guide structure includes an overlap portion, and the insulating plate is formed with a support portion on the circumferential edge of the liquid injection hole, and the support portion is suitable for supporting the overlap portion; The guide structure is provided with a rotation-stopping portion formed on the circumferential outer surface of the overlap portion, and the insulating plate is provided with a rotation-stopping abutting portion surrounding the support portion, wherein the rotation-stopping portion matches the shape of the rotation-stopping abutting portion; The anti-rotation portion is adapted to limit the rotation of the flow guide structure around the axis when it cooperates with the anti-rotation abutment portion; the anti-rotation portion is adapted to rotate the flow guide structure by a preset angle when it is disengaged from the anti-rotation abutment portion, and the angle of the flow guide structure is adjusted by the re-cooperation of the anti-rotation portion and the anti-rotation abutment portion; The anti-rotation portion includes a polygonal structure formed on the circumferential outer surface of the overlapping portion, and the polygonal structure is an equilateral polygon; The circumferential wall surface of the guide structure is provided with M guide grooves, and M≥2; the opening length of the M guide grooves surrounding the circumferential wall surface of the guide structure is P, the circumference of the circumferential wall surface of the guide structure is S, and the following is satisfied: 5%≤P / S≤50%.

2. The battery cover assembly according to claim 1, characterized in that: The number of sides of the polygonal structure is N, and N≥3; The anti-rotation abutment portion includes a polygonal groove formed on the insulating plate and adapted to the polygonal structure.

3. The battery cover assembly according to claim 1, characterized in that: The plurality of guide grooves are arranged at equal intervals around the circumferential wall surface of the guide structure.

4. The battery cover assembly according to any one of claims 1 to 2, characterized in that: The material strength of the guide structure is greater than the material strength of the insulating plate.

5. A battery, characterized in that: include: case; And a battery cover assembly as described in any one of claims 1 to 4 above, which is arranged to cover the opening of the shell.

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