Top cover support, top cover assembly and battery

Abstract

The top cover support is applied to the battery, the battery is provided with a liquid injection hole, the top cover support comprises a support plate and a first convex part, the support plate is provided with a first surface and a second surface which are opposite to each other, the first convex part is arranged on the first surface in a protruding mode, and the first convex part is arranged on the second surface in a protruding mode. The top cover support is provided with a buffer groove and a liquid passing hole at least penetrating through the groove side wall of the buffer groove, the buffer groove is partially formed in the first protruding part, a groove opening of the buffer groove penetrates through the second surface, and the groove bottom wall of the buffer groove is opposite to the liquid injection hole. According to the technical scheme provided by the utility model, the impact effect on the naked battery cell when the electrolyte is injected can be weakened, so that the production yield of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover bracket, a top cover component and a battery. Background Art

[0002] Lithium batteries usually include a shell, a bare cell and a top cover assembly, wherein the bare cell is arranged inside the shell, and the top cover assembly is arranged at the opening of the shell to achieve sealing and electrical connection of the bare cell. The top cover assembly includes a bare aluminum sheet and a plastic bracket, the plastic bracket is arranged on the inner surface of the bare aluminum sheet, the bare aluminum sheet is provided with a liquid injection hole, and the plastic bracket is provided with a liquid through hole corresponding to the liquid injection hole, and the electrolyte can be injected into the shell through the liquid injection hole and the liquid through hole.

[0003] However, the injection hole and the liquid hole of the existing top cover assembly are simple through-hole structures, so that the electrolyte will directly impact the bare cell when injected. In particular, when the injection parameters fluctuate, the electrolyte will impact the diaphragm of the bare cell, resulting in the problem of pole piece overlap and short circuit when the impact is severe. Utility Model Content

[0004] The main purpose of the utility model is to provide a top cover bracket, which is intended to weaken the impact of electrolyte injection on the bare battery cell, thereby improving the production yield of the battery.

[0005] In order to achieve the above-mentioned purpose, the top cover bracket proposed by the utility model is applied to a battery, wherein the battery is provided with a liquid injection hole, and the top cover bracket comprises:

[0006] a bracket plate having opposing first and second surfaces; and

[0007] The first convex portion is convexly arranged on the first surface, the top cover bracket is provided with a buffer groove and a liquid hole at least penetrating the groove side wall of the buffer groove, the buffer groove is partially arranged on the first convex portion and the groove opening penetrates the second surface, and the groove bottom wall of the buffer groove is arranged opposite to the liquid injection hole.

[0008] Optionally, the first surface is the inner surface of the support plate and is arranged close to the bare cell of the battery, and the side wall of the buffer groove includes a first wall segment and a second wall segment, the first wall segment is connected between the second wall segment and the support plate, and the second wall segment is connected to the bottom wall of the buffer groove.

[0009] Optionally, the first wall segments are arranged gradually approaching the center in a direction close to the second wall segment.

[0010] Optionally, the angle between the first wall segment and the central axis of the buffer groove is β, and the value of β is 110° to 160°.

[0011] Optionally, the liquid-passing hole penetrates both the second wall segment and the bottom wall of the buffer tank.

[0012] Optionally, the ratio of the height of the liquid passage hole to the depth of the buffer groove is 30% to 70%.

[0013] Optionally, a plurality of the liquid passage holes are provided, and the plurality of the liquid passage holes are distributed at intervals along the circumference of the buffer groove.

[0014] Optionally, the top cover bracket further includes a second protrusion protruding from the first surface, the inner surface of the second protrusion protrudes from the inner surface of the first protrusion and is used to abut against the bare battery cell.

[0015] Optionally, the notch of the buffer groove is arranged opposite to the injection hole, and the width of the notch of the buffer groove is greater than the aperture of the injection hole.

[0016] The utility model further provides a top cover assembly, comprising a top cover body and the above-mentioned top cover bracket, wherein the top cover bracket is arranged on the top cover body, and the top cover body is provided with a liquid injection hole.

[0017] The utility model also proposes a battery, comprising a shell, a bare cell and the aforementioned top cover assembly, wherein the shell has an installation cavity and an installation opening connected to the installation cavity, the bare cell is arranged in the installation cavity, and the top cover assembly is sealed on the installation opening.

[0018] Optionally, the battery further comprises a sealing nail, wherein the sealing nail is inserted into the liquid injection hole, and an end portion of the sealing nail extends into the buffer groove, and a groove bottom wall of the buffer groove is arranged opposite to the sealing nail.

[0019] In the technical solution of the utility model, the top cover bracket is provided with a buffer groove and a liquid hole corresponding to the injection hole. When the electrolyte is injected into the installation cavity through the injection hole, the electrolyte will be blocked by the bottom wall of the buffer groove opposite to the injection hole and cannot flow directly into the installation cavity. Instead, it flows through the liquid hole located on the side wall of the buffer groove to flow into the installation cavity. In this way, it can avoid the electrolyte directly impacting the bare battery cell, and the problem of pole piece overlap and short circuit when the impact is severe, thereby improving the production yield of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1This is a structural schematic diagram of an embodiment of the top cover assembly of the utility model;

[0022] Figure 2 for Figure 1 Bottom view of the middle top cover bracket;

[0023] Figure 3 for Figure 2 a cross-sectional view of the top cover bracket shown;

[0024] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0025] Figure 5 It is a cross-sectional view of another embodiment of the top cover bracket of the utility model.

[0026] Description of Figure Numbers:

[0027] Label name Label name 10 Top cover bracket 142 Second wall segment 11 Bracket plate 15 Liquid hole 12 first convex part 20 Top cover body 13 second convex part 21 Filling hole 14 Buffer tank 30 Pole 141 First wall segment

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0033] Lithium batteries usually include a shell, a bare cell and a top cover assembly, wherein the bare cell is arranged inside the shell, and the top cover assembly is arranged at the opening of the shell to achieve sealing and electrical connection of the bare cell. The top cover assembly includes a bare aluminum sheet and a plastic bracket, the plastic bracket is arranged on the inner surface of the bare aluminum sheet, the bare aluminum sheet is provided with a liquid injection hole, and the plastic bracket is provided with a liquid through hole corresponding to the liquid injection hole, and the electrolyte can be injected into the shell through the liquid injection hole and the liquid through hole.

[0034] However, the injection hole and the liquid hole of the existing top cover assembly are simple through-hole structures, so that the electrolyte will directly impact the bare cell when injected. In particular, when the injection parameters fluctuate, the electrolyte will impact the diaphragm of the bare cell, resulting in the problem of pole piece overlap and short circuit when the impact is severe.

[0035] In view of this, the utility model proposes a top cover bracket, which is applied to the top cover assembly of a battery. The battery includes a shell and a bare cell. The shell has a mounting cavity and a mounting opening connected to the mounting cavity. The bare cell is arranged in the mounting cavity, and the top cover assembly is sealed on the mounting opening. Please refer to Figures 1 to 3 The top cover assembly includes a top cover body 20, a pole 30 and a connecting piece (the structure of the connecting piece is not shown in the drawings, but is Figure 2 The installation position of the connecting piece is indicated by the hatched line in the figure), one end of the pole 30 is exposed on the outer surface of the top cover assembly, the connecting piece is arranged on the inner surface of the top cover bracket 10 and is used to connect the pole 30 and the bare battery cell, the top cover body 20 is provided with a liquid injection hole 21, and the top cover bracket 10 is arranged on the inner surface of the top cover body 20.

[0036] Please refer to Figures 2 to 4 In one embodiment of the present utility model, the top cover bracket 10 includes:

[0037] A support plate 11 having a first surface and a second surface opposite to each other; and

[0038] The first protrusion 12 is protruding from the first surface of the bracket plate 11. The top cover bracket 10 is provided with a buffer groove 14 and a liquid hole 15 that at least passes through the side wall of the buffer groove 14. The buffer groove 14 is partially provided on the first protrusion 12 and the groove opening passes through the second surface of the bracket plate 11. The bottom wall of the buffer groove 14 is arranged opposite to the injection hole 21.

[0039] In the technical solution of the utility model, the top cover bracket 10 is provided with a buffer groove 14 and a liquid hole 15 corresponding to the injection hole 21. When the electrolyte is injected into the installation cavity through the injection hole 21, the electrolyte will be blocked by the bottom wall of the buffer groove 14 opposite to the injection hole 21, and cannot flow directly into the installation cavity, but flows through the liquid hole 15 located on the side wall of the buffer groove 14 to flow into the installation cavity. In this way, it is possible to avoid the electrolyte directly impacting the bare battery cell, and the problem of pole piece overlap and short circuit when the impact is severe, thereby improving the production yield of the battery.

[0040] For more information, please refer to Figure 3 and Figure 4 In one embodiment, the first surface is the inner surface of the bracket plate 11 and is arranged close to the bare cell of the battery, that is, the first protrusion 12 is arranged on the inner surface of the bracket plate 11, and the notch of the buffer groove 14 passes through the outer surface of the bracket plate 11 and is arranged facing the injection hole 21. In this way, the first protrusion 12 can utilize the space of the installation cavity without occupying the external space of the top cover bracket 10, which is conducive to reducing the outer contour size and volume of the battery. At this time, when the electrolyte is injected into the installation cavity through the injection hole 21, the electrolyte will first flow into the buffer groove 14 through the notch of the buffer groove 14, and be blocked by the bottom wall of the buffer groove 14, and turn to flow into the liquid hole 15, and finally flow into the installation cavity through the liquid hole 15.

[0041] Of course, please refer to Figure 5 In another embodiment, the second surface may be the inner surface of the bracket plate 11 and arranged close to the bare cell of the battery, that is, the first protrusion 12 is arranged on the outer surface of the bracket plate 11, and the notch of the buffer groove 14 penetrates the inner surface of the bracket plate 11 and is arranged away from the injection hole 21. At this time, when the electrolyte is injected into the installation cavity through the injection hole 21, the electrolyte will first hit the bottom wall of the buffer groove 14, and then flow through the liquid hole 15 after bypassing the bottom wall of the buffer groove 14, and then flow into the buffer groove 14 through the liquid hole 15, and finally flow into the installation cavity through the notch of the buffer groove 14.

[0042] It should be noted that the inner surface of the above-mentioned part or structure refers to the surface of the part or structure facing the installation cavity of the shell when the battery assembly production is completed. For example, the inner surface of the top cover bracket 10 is located in the installation cavity.

[0043] Specifically, the connecting piece is provided with a clearance opening corresponding to the first protrusion 12, so that the connecting piece can be installed on the inner surface of the bracket plate 11 from the inside to the outside. Optionally, in this embodiment, the groove side wall of the buffer groove 14 includes a first wall section 141 and a second wall section 142, the first wall section 141 is connected between the second wall section 142 and the bracket plate 11, and the second wall section 142 is connected to the groove bottom wall of the buffer groove 14.

[0044] Further optionally, the first wall section 141 is gradually arranged to approach the center in the direction close to the second wall section 142. That is, in the direction in which the top cover assembly is installed into the installation opening, the cross-sectional width dimension of the buffer groove 14 area defined by the first wall section 141 is gradually arranged. In this way, since the cross-sectional width dimension of the second wall section 142 is smaller than the cross-sectional width dimension of the first wall section 141, the second wall section 142 can avoid the connecting piece well during the installation process of the connecting piece, which facilitates the installation of the connecting piece on the inner surface of the bracket plate 11 from the inside to the outside, thereby improving the installation convenience of the connecting piece. Of course, in other embodiments, the cross-sections of the first wall section 141 and the second wall section 142 may be arranged to be the same, or the first wall section 141 may be arranged to gradually move away from the center in the direction close to the second wall section 142.

[0045] Optionally, the angle between the first wall segment 141 and the central axis of the buffer tank 14 is β, and the value of β is 110° to 160°. The angle β within this value range can enable the first wall segment 141 to play a better guiding role when the electrolyte is injected, thereby improving the flow smoothness of the electrolyte in the buffer tank 14. It can be understood that if the angle β is too small, the first wall segment 141 will play a great obstructive role when the electrolyte is injected, thereby significantly affecting the fluidity of the electrolyte. If the angle β is too large, the cross-sectional width of the first wall segment 141 changes slowly, which is not conducive to reducing the cross-sectional width of the second wall segment 142. Preferably, β is 130° to 150°.

[0046] Optionally, the liquid-passing hole 15 penetrates the second wall section 142 and the bottom wall of the buffer tank 14 at the same time. In this way, the processing and forming of the liquid-passing hole 15 is facilitated, and the liquid-passing hole 15 can be closer to the bottom wall of the buffer tank 14, which is conducive to the electrolyte flowing from the buffer tank 14 into the liquid-passing hole 15 more smoothly when injected. Of course, in other embodiments, the liquid-passing hole 15 can also be arranged on the first wall section 141, or a part of the liquid-passing hole 15 can be arranged on the first wall section 141 and the other part can be arranged on the second wall section 142.

[0047] Optionally, a plurality of liquid holes 15 are provided, and the plurality of liquid holes 15 are spaced and distributed along the circumference of the second wall section 142. In this way, the impact force of the electrolyte when it is injected into the installation cavity can be further dispersed and weakened by the plurality of liquid holes 15 with small apertures, thereby facilitating the improvement of the electrolyte infiltration efficiency. Figure 2The embodiment shown has four liquid-passing holes 15, which are evenly spaced and the central angle corresponding to each liquid-passing hole 15 is approximately 90°. Of course, in other embodiments, only one or two liquid-passing holes 15 may be provided.

[0048] Specifically, the cross-sectional shape of the buffer tank 14 can be circular, elliptical, triangular, square or other polygonal, etc., which is not specifically limited in the present application. For example, in an embodiment where the cross-sectional shape of the buffer tank 14 is triangular, optionally, three liquid-passing holes 15 are provided, and are respectively arranged corresponding to the three sides of the triangle.

[0049] In order to ensure that the liquid hole 15 has a larger flow cross-sectional area, optionally, the ratio of the height of the liquid hole 15 to the depth of the buffer groove 14 is 30% to 70%. Figure 4 The ratio of H1 to H2 is shown to be 30% to 70%. Preferably, the ratio of the height of the liquid-passing hole 15 to the depth of the buffer groove 14 is 45% to 65%.

[0050] Optionally, the top cover bracket 10 also includes a second protrusion 13 protruding from the first surface (i.e., the inner surface) of the bracket plate 11, and the inner surface of the second protrusion 13 protrudes from the inner surface of the first protrusion 12, and is used to abut against the bare battery cell. That is, in the direction in which the top cover assembly is installed into the installation opening, the inner surface of the second protrusion 13 is higher than the inner surface of the first protrusion 12. In this way, the positioning and limiting effect of the bare battery cell can be achieved by the second protrusion 13 abutting against the bare battery cell, so that the bare battery cell can be maintained in a relative position in the installation cavity. Secondly, the inner surface of the first protrusion 12 and the bare battery cell are arranged at intervals, so that the impact force acting on the bottom wall of the buffer tank 14 when the electrolyte is injected will not be directly transmitted to the bare battery cell, which is conducive to maintaining the position stability of the bare battery cell. Of course, in other embodiments, the inner surface of the first protrusion 12 and the inner surface of the second protrusion 13 can also be arranged flush, or the inner surface of the first protrusion 12 can protrude from the inner surface of the second protrusion 13.

[0051] Optionally, the notch of the buffer tank 14 is arranged opposite to the injection hole 21, and the width of the notch of the buffer tank 14 is greater than the diameter of the injection hole 21. In this way, the electrolyte can flow more smoothly from the injection hole 21 into the buffer tank 14, thereby improving the flow smoothness and stability of the electrolyte. Of course, in other embodiments, the notch of the buffer tank 14 and the injection hole 21 may be arranged in the length direction of the top cover bracket 10 (i.e. Figure 1 The buffer groove 14 is arranged at intervals in the Y direction as shown, or the slot width of the buffer groove 14 is less than or equal to the aperture of the liquid injection hole 21.

[0052] Optionally, the battery also includes a sealing pin (not shown in the drawings), which is sealingly inserted into the injection hole 21, and the end of the sealing pin extends into the buffer groove 14, and the bottom wall of the buffer groove 14 is arranged opposite to the sealing pin. In this way, after the electrolyte injection is completed, the injection hole 21 is blocked by the sealing pin, and the end of the sealing pin is accommodated by the volume of the buffer groove 14. The structure is simple and easy to implement. Secondly, since the bottom wall of the buffer groove 14 is aligned with the sealing pin, the problem of the sealing pin falling into the interior of the shell can be avoided. Further optionally, the width dimension D of the buffer groove 14 corresponding to the second wall section 142 is ≥1.5mm, for example, D is 3mm or 4mm.

[0053] The utility model also provides a top cover assembly, which includes a top cover body and a top cover bracket. The specific structure of the top cover bracket refers to the above embodiment. Since the top cover assembly adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The top cover bracket is arranged on the top cover body, and the top cover body is provided with a liquid injection hole.

[0054] The utility model also proposes a battery, including a shell, a bare cell and a top cover assembly, the top cover assembly includes a top cover body and a top cover bracket, the specific structure of the top cover bracket refers to the above embodiment, since the top cover assembly adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the battery includes a shell and a bare cell, the shell has an installation cavity and an installation opening connected to the installation cavity, the bare cell is arranged in the installation cavity, and the top cover assembly is sealed on the installation opening.

[0055] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A top cover bracket, applied to a battery, wherein the battery is provided with a liquid injection hole, characterized in that: The top cover bracket comprises: a bracket plate having opposing first and second surfaces; and The first convex portion is convexly arranged on the first surface, the top cover bracket is provided with a buffer groove and a liquid hole at least penetrating the groove side wall of the buffer groove, the buffer groove is partially arranged on the first convex portion and the groove opening penetrates the second surface, and the groove bottom wall of the buffer groove is arranged opposite to the liquid injection hole.

2. The top cover bracket according to claim 1, characterized in that: The first surface is the inner surface of the support plate and is arranged close to the bare cell of the battery. The side wall of the buffer groove includes a first wall segment and a second wall segment. The first wall segment is connected between the second wall segment and the support plate, and the second wall segment is connected to the bottom wall of the buffer groove.

3. The top cover bracket according to claim 2, characterized in that: The first wall segments are arranged gradually approaching the center in a direction close to the second wall segment.

4. The top cover bracket according to claim 3, characterized in that: The included angle between the first wall segment and the central axis of the buffer groove is β, and the value of β is 110° to 160°.

5. The top cover bracket according to claim 2, characterized in that: The liquid-passing hole penetrates the second wall section and the bottom wall of the buffer tank at the same time.

6. The top cover bracket according to claim 2, characterized in that: The notch of the buffer groove is arranged opposite to the injection hole, and the width of the notch of the buffer groove is larger than the aperture of the injection hole; And / or, the top cover bracket also includes a second protrusion protruding from the first surface, the inner surface of the second protrusion protrudes from the inner surface of the first protrusion, and is used to abut against the bare battery cell.

7. The top cover bracket according to claim 1, characterized in that: The ratio of the height of the liquid-passing hole to the depth of the buffer groove is 30% to 70%; And / or, the liquid passage holes are provided in plurality, and the plurality of liquid passage holes are distributed at intervals along the circumference of the buffer groove.

8. A top cover assembly, characterized in that: It comprises a top cover body and a top cover bracket as described in any one of claims 1 to 7, wherein the top cover bracket is arranged on the top cover body, and the top cover body is provided with a liquid injection hole.

9. A battery, characterized in that: It comprises a shell, a bare battery cell and a top cover assembly as described in claim 8, wherein the shell has an installation cavity and an installation opening connected to the installation cavity, the bare battery cell is arranged in the installation cavity, and the top cover assembly is sealed on the installation opening.

10. The battery according to claim 9, characterized in that The battery further comprises a sealing nail, which is inserted into the liquid injection hole and has an end portion extending into the buffer groove, and a groove bottom wall of the buffer groove is arranged opposite to the sealing nail.

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