Single battery

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery, and a battery cover plate assembly comprises a metal cover plate, a battery cover plate and a battery cover plate, the insulating part is arranged on one side of the large surface of the metal cover plate, and an avoiding hole is formed in the position, corresponding to the through hole, of the insulating part; the insulating part extends towards one side deviating from the metal cover plate to form a plurality of convex parts, and the plurality of convex parts are arranged around the avoiding hole; the distance between two convex parts with the farthest distance in the plurality of convex parts is defined as p; and in the two convex parts with the farthest distance, the height of the convex part with the highest height raised by the insulating part is q, and p / q is more than or equal to 1 and less than or equal to 20. According to the battery cover plate assembly provided by the utility model, the convex part is arranged, so that the diaphragm close to one side of the insulating part can be supported, the diaphragm is prevented from being adsorbed to the avoiding hole or the through hole due to negative pressure, the avoiding hole or the through hole is prevented from being blocked, and the smooth operation of secondary liquid injection is ensured.

Description

[0001] The present application is a divisional application of the invention entitled "Battery cover plate assembly and single battery", the original application date is July 16, 2024, and the application number is 2024216849737. TECHNICAL FIELD

[0002] The utility model relates to a battery technical field, concretely relates to a single battery. BACKGROUND

[0003] The battery generally includes a cell, a shell and a cover plate, wherein the cover plate is sealingly arranged at the opening of the shell to form an accommodating cavity with the shell and the cover plate, and the cell is arranged in the accommodating cavity. The cover plate is usually provided with a liquid injection hole to facilitate the injection of electrolyte. The preparation form of the cell includes winding type and laminated type, and no matter winding type or laminated type, a separator needs to be arranged between the positive plate and the negative plate. After the cell is loaded into the accommodating cavity, the edge of the separator is arranged towards the cover plate.

[0004] However, the negative pressure in the negative pressure formation process can cause the separator to be adsorbed at the liquid injection hole, thereby blocking the liquid injection hole and affecting the secondary injection of the battery. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a battery to solve the problem that the separator easily blocks the through hole and affects the secondary injection of the battery.

[0006] In a first aspect, the utility model provides a battery cover plate assembly, comprising:

[0007] A metal cover plate having a through hole formed therein;

[0008] An insulating member arranged on one side of the large face of the metal cover plate, the insulating member having a relief hole corresponding to the position of the through hole; the insulating member extends to form a plurality of protrusions on the side away from the metal cover plate, and the plurality of protrusions are arranged around the relief hole;

[0009] The distance between the two protrusions farthest apart in the plurality of protrusions is defined as p; the height of the protrusion with the highest height protruding from the insulating member among the two protrusions farthest apart is q, and 1≤p / q≤20 is satisfied.

[0010] Beneficial effects: the battery cover plate assembly provided by the embodiment of the utility model, a plurality of convex parts are formed on the side of the insulating part away from the metal cover plate and are arranged around the avoiding hole; by arranging the convex parts, the diaphragm on the side of the insulating part can be supported, the diaphragm is prevented from being adsorbed on the avoiding hole or the through hole due to negative pressure, the avoiding hole or the through hole is prevented from being blocked, and thus the secondary liquid injection is ensured to be carried out smoothly. The relationship between p and q is further limited, so that when p becomes larger, q also needs to be correspondingly higher, and when the diaphragm is in the negative pressure adsorption state, the diaphragm in the middle of the two convex parts will not be partially blocked from the through hole due to the larger spacing between the convex parts; meanwhile, in order to prevent the convex parts from interfering with the installation of the battery cell, the height of the convex parts should not be too high, and correspondingly, the distance p between the two convex parts farthest apart in the plurality of convex parts should also not be too large.

[0011] In a second aspect, the utility model further provides a single battery, which comprises:

[0012] A shell;

[0013] And the battery cover plate assembly as described above is sealingly arranged at the opening of the shell, and the battery cover plate assembly and the shell enclose a containing cavity;

[0014] A battery cell, which is arranged in the containing cavity;

[0015] The insulating part is located between the battery cell and the battery cover plate assembly;

[0016] The battery cell comprises a diaphragm, and the porosity of the diaphragm is c, wherein the value range of c is 30%≤c≤50%, and at this time, p / q satisfies 2≤p / q≤18.

[0017] Beneficial effects: the battery provided by the embodiment of the utility model, when the porosity c of the diaphragm is larger, the permeability of the electrolyte is better correspondingly, but at this time, the diaphragm material is relatively soft and is easy to be adsorbed and block the through hole, therefore, the distance p between the two convex parts farthest apart in the plurality of convex parts should not be too large. When the porosity c of the diaphragm is smaller, the permeability of the electrolyte is poor correspondingly, but at this time, the diaphragm material is relatively hard and is not easy to block the through hole due to negative pressure adsorption, therefore, the distance p between the two convex parts farthest apart in the plurality of convex parts can be appropriately increased. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0019] Figure 1 is a schematic view of the battery cover plate assembly of the utility model;

[0020] Figure 2 is a schematic view of the insulating part of the utility model;

[0021] Figure 3 is a bottom view of the insulating part of the utility model;

[0022] Figure 4 is a partial enlarged view of Figure 3 ;

[0023] Figure 5 is a schematic view of the A-A section of Figure 4 ;

[0024] Figure 6 is a schematic view of the single battery of the utility model;

[0025] Figure 7 is a schematic view of the exploded state of the single battery of the utility model;

[0026] Figure 8 is a schematic view of the exploded state of another single battery of the utility model;

[0027] Explanation of reference signs:

[0028] 1, battery cover plate assembly; 11, metal cover plate; 111, through hole; 12, insulating part; 121, avoiding hole; 122, convex part;

[0029] 2, shell; 3, electric core; 31, diaphragm; 32, pole lug; 4, insulating fixed layer; 5, pole. Specific implementation

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below by combining the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0031] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the device or element must have a specific orientation, a specific orientation and operation, therefore, cannot be understood as limiting the utility model. In addition, the terms "first", "second" and "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the device or element must have a specific orientation, a specific orientation and operation, therefore, cannot be understood as limiting the utility model. In addition, the terms "first", "second" and "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0034] The battery generally includes a cell, a shell and a cover plate, wherein the cover plate is sealingly arranged at the opening of the shell to form an accommodation cavity with the shell and the cover plate, and the cell is arranged in the accommodation cavity. After the battery is assembled, the inside of the accommodation cavity needs to be injected with liquid, and an injection hole is usually formed on the cover plate so that electrolyte can be injected into the battery through the injection hole. The preparation form of the cell includes winding type and laminated type, and no matter the winding type or the laminated type, a separator needs to be arranged between the positive plate and the negative plate. After the cell is loaded into the accommodation cavity, the edge of the separator is arranged towards the cover plate.

[0035] In a one-time injection process, electrolyte is injected into the accommodation cavity from the injection hole under the action of positive pressure, at this time, the electrolyte is easy to wash away the separator, and will not affect normal injection. After the electrolyte is injected into the cell, a negative pressure formation process is needed, in this process, the inside of the battery shell is in a negative pressure state, the separator is easy to be adsorbed at the injection hole due to the negative pressure, which causes blockage of the injection hole and affects the secondary injection of the battery.

[0036] The embodiments of the utility model are described below in combination with Figures 1 to 8 , the description of the utility model.

[0037] According to the embodiments of the utility model, on the one hand, a battery cover plate assembly 1 is provided, which comprises:

[0038] A metal cover plate 11 is provided with a through hole 111;

[0039] The insulating piece 12 is arranged on one side of the large face of the metal cover plate 11, and the insulating piece 12 is provided with a relief hole 121 corresponding to the position of the through hole 111; the insulating piece 12 is extended to form a plurality of protrusions 122 on the side away from the metal cover plate 11, and the plurality of protrusions 122 are arranged around the relief hole 121;

[0040] The distance between the two protrusions 122 farthest away in the plurality of protrusions 122 is defined as p; the height of the protrusion 122 with the highest height protruding from the insulating piece 12 among the two protrusions 122 farthest away is q, and 1≤p / q≤20 is satisfied.

[0041] In the embodiment, the material of the metal cover plate 11 can be aluminum, aluminum alloy or stainless steel, etc.

[0042] The through hole 111 is arranged on the metal cover plate 11, so that the electrolyte can be injected into the battery through the through hole 111. The insulating piece 12 is provided with a relief hole 121 corresponding to the position of the through hole 111, so that the smooth injection of the electrolyte is not interfered by the insulating piece 12 during the injection process.

[0043] The battery cover plate assembly 1 of the embodiment is applied to a battery. During the assembly of the battery, the battery cell 3 is first assembled into the shell 2, and then the battery cover plate assembly 1 is sealed and arranged at the opening of the shell 2. The insulating piece 12 of the battery cover plate assembly 1 can abut against the battery cell 3 to prevent the battery cell 3 from moving along the assembly direction, and the insulating piece 12 can insulate the battery cell 3 and the metal cover plate 11. Since the battery cell 3 includes a diaphragm 31, under normal circumstances, the diaphragm 31 will not block the through hole 111, and during the first injection process, the electrolyte is injected into the accommodating cavity under the action of positive pressure through the through hole 111. At this time, the electrolyte is easy to flush away the diaphragm 31, and will not affect the normal injection. After the electrolyte is injected into the battery, a negative pressure formation process is needed, during which the inside of the battery is in a negative pressure state. The diaphragm 31 close to the insulating piece 12 is easy to be adsorbed at the relief hole 121 or the through hole 111 due to the negative pressure, which blocks the relief hole 121 or the through hole 111 and affects the second injection of the battery.

[0044] The battery cover plate assembly provided by the embodiment of the utility model can support the diaphragm 31 close to the insulating piece 12 through the protrusions 122, avoid the diaphragm 31 from being adsorbed at the relief hole 121 or the through hole 111 due to the negative pressure, prevent the diaphragm 31 from blocking the relief hole 121 or the through hole 111, and ensure the smooth second injection.

[0045] The battery cover plate assembly provided by the embodiment of the utility model further limits the relationship between p and q, so that when p is large, q also needs to be high correspondingly, prevents the diaphragm 31 from being partially blocked from the through hole 111 in the middle of the two convex parts 122 when the diaphragm 31 is in a negative pressure adsorption state due to the large spacing between the convex parts 122; at the same time, in order to avoid interference caused by the convex part 122 to the installation of the battery cell 3, the height of the convex part 122 should not be too high, and correspondingly, the distance p between the two convex parts 122 that are farthest apart in the plurality of convex parts 122 should not be too large.

[0046] Need to be explained, since the diaphragm 31 blocks the escape hole 121 or the through hole 111, the effect achieved is consistent, and both will cause abnormal injection of electrolyte in the secondary liquid injection process. In order to simplify the description, the diaphragm 31 blocks the escape hole 121 or the through hole 111 in the following will be simplified as the diaphragm 31 blocks the through hole 111, which will not mislead the person skilled in the art that the diaphragm 31 cannot block the escape hole 121.

[0047] The metal cover plate 11 is further provided with a pole 5.

[0048] In some embodiments, the value range of p is 6mm≤p≤20mm, and the value range of q is 1mm≤q≤6mm.

[0049] As an optional implementation form, the value of p can be 6mm or 7mm or 8mm or 8.5mm or 9mm or 10mm or 10.3mm or 11mm or 12mm or 15mm or 17mm or 18mm or 19mm or 20mm, etc.

[0050] As an optional implementation form, the value of q can be 1mm or 1.5mm or 2mm or 2.8mm or 3mm or 4mm or 4.5mm or 5mm or 5.6mm or 6mm, etc.

[0051] According to the embodiment of the utility model, on the other hand, a single battery is also provided, which comprises:

[0052] The shell 2;

[0053] And the battery cover plate assembly 1 as described above is sealingly arranged at the opening of the shell 2, and the battery cover plate assembly 1 and the shell 2 form an accommodating cavity;

[0054] The battery cell 3 is arranged in the accommodating cavity; the battery cell 3 comprises a diaphragm 31, and the porosity of the diaphragm 31 is c, wherein the value range of c is 30%≤c≤50%, and at this time, p / q satisfies: 2≤p / q≤18.

[0055] In the embodiment, the porosity of the diaphragm 31 is c, when the porosity c of the diaphragm 31 is larger, the corresponding electrolyte has better permeability, but at this time, the diaphragm 31 is softer, and is easy to be adsorbed and block the through hole, therefore, the distance p between the two farthest convex parts 122 in the corresponding plurality of convex parts 122 is not too large, that is, in the embodiment, the upper limit of p / q is 18, which is less than the maximum value 20 of p / q. When the porosity c of the diaphragm 31 is smaller, the corresponding electrolyte has poor permeability, but at this time, the diaphragm 31 is harder, and is not easy to block the through hole due to negative pressure adsorption, therefore, the distance p between the two farthest convex parts 122 in the corresponding plurality of convex parts 122 can be appropriately increased, that is, in the embodiment, the lower limit of p / q is 2, which is greater than the minimum value 1 of p / q.

[0056] In some embodiments, the thickness of the diaphragm 31 is d, wherein d is in the range of 4 μm≤d≤28 μm, at this time, p / q satisfies: 2≤p / q≤12.5.

[0057] In the embodiment, the thickness of the diaphragm 31 is d, the smaller the thickness d of the diaphragm 31, the larger the deformation amount of the diaphragm 31 under the same negative pressure condition, and then the diaphragm 31 is more likely to block the through hole 111 after negative pressure formation, therefore, the distance p between the two farthest convex parts 122 in the corresponding plurality of convex parts 122 is not too large, that is, in the embodiment, the upper limit of p / q is 12.5, which is less than the maximum value 20 of p / q. When the thickness d of the diaphragm 31 is larger, the deformation amount of the diaphragm 31 is smaller under the same negative pressure condition, and then the diaphragm 31 is not easy to block the through hole after negative pressure formation, therefore, the distance p between the two farthest convex parts 122 in the corresponding plurality of convex parts 122 can be appropriately increased, that is, in the embodiment, the lower limit of p / q is 2, which is greater than the minimum value 1 of p / q.

[0058] In some embodiments, in combination with Figure 8 As shown in the figure, the battery cell 3 further comprises: an insulating fixing layer 4, the insulating fixing layer 4 is at least partially arranged on the side of the battery cell 3 close to the battery cover plate assembly 1.

[0059] Along the length direction of the metal cover plate 11, the length of the insulating fixing layer 4 is defined as L1, and the length of the battery cell 3 is defined as L2, and it satisfies: 0.05≤L1 / L2≤0.4.

[0060] Wherein, the length direction of the metal cover plate 11 is the direction of the longest side of each side of the metal cover plate 11.

[0061] By arranging the insulating fixing layer 4 at least partially on the side of the battery cell 3 close to the battery cover plate assembly 1, the diaphragm 31 can be constrained by the insulating fixing layer 4, and the situation that the diaphragm 31 is blocked due to negative pressure adsorption can be reduced. The longer the length L1 of the insulating fixing layer 4 along the length direction of the battery cell 3, the better the fixing ability, and the diaphragm 31 is less likely to block the through hole 111. However, the length L1 of the insulating fixing layer 4 along the length direction of the battery cell 3 should not be too long, so as to avoid that the insulating fixing layer 4 covers too large an area on the side of the battery cell 3 close to the battery cover plate assembly 1, and avoids affecting the impregnation effect of the electrolyte on the battery cell 3. In addition, once the battery cell expands, the too long insulating fixing layer 4 will also damage the side of the battery cell, which has certain safety hazards.

[0062] In some embodiments, along the length direction of the metal cover plate 11, the length L1 of the insulating fixing layer 4 is in the range of 20mm≤L1≤40mm. The length L2 of the battery cell 3 is in the range of 100mm≤L2≤400mm.

[0063] As an optional implementation form, the length L1 can be 20mm or 21mm or 23mm or 25mm or 27mm or 28mm or 30mm or 31mm or 33mm or 35mm or 37mm or 38mm or 39mm or 40mm, etc.

[0064] As an optional implementation form, the length L2 can be 100mm or 115mm or 120mm or 180mm or 200mm or 230mm or 270mm or 300mm or 350mm or 400mm, etc.

[0065] In some embodiments, in combination with Figure 7 As shown in FIG. 1, the battery cell 3 is a winding battery cell, and the battery cell 3 includes a positive electrode sheet, a negative electrode sheet, and a diaphragm 31 separating the positive electrode sheet and the negative electrode sheet. The battery cell 3 also includes a tab 32.

[0066] The leading end of the tab 32 is located on the same side of the battery as the battery cover plate assembly 1. The shortest distance h between the diaphragm 31 on the side of the battery cell 3 close to the battery cover plate assembly 1 and the convex part 122 is in the range of 0mm≤h≤5mm. At this time, p / q satisfies: 2≤p / q≤13.

[0067] When the leading end of the tab 32 is located on the same side of the battery as the battery cover plate assembly 1, by limiting the shortest distance h between the diaphragm 31 on the side of the battery cell 3 close to the battery cover plate assembly 1 and the convex part 122, it can be ensured that there is an initial distance between the diaphragm 31 and the convex part 122, and the diaphragm 31 is less likely to be blocked due to negative pressure adsorption on the through hole 111 in the subsequent formation process.

[0068] Additionally, the shortest distance h between the diaphragm 31 on the side of the battery cell 3 close to the battery cover plate assembly 1 and the convex part 122 can be controlled by controlling the overhanging amount of the diaphragm 31.

[0069] In some embodiments, the battery cell 3 is a laminated battery cell, and the battery cell 3 includes a battery cell body, an insulating film, and a tab 32, the insulating film being arranged between the battery cell body and the shell 2.

[0070] The leading end of the tab 32 is located on a different side of the monomer battery from the battery cover plate assembly 1, and the shortest distance between the insulating film and the convex part 122 is m, where the value of m is in the range of 0mm≤m≤4mm, and at this time, p / q satisfies: 2.2≤p / q≤18.

[0071] In this embodiment, the insulating film can be a mylar film wrapped around the outer circumferential side of the battery cell body, or a diaphragm 31 separating the positive and negative plates, or other insulating films arranged on the battery cell 3.

[0072] When the leading end of the tab 32 is located on a different side of the monomer battery from the battery cover plate assembly 1, by limiting the shortest distance m between the insulating film and the convex part 122, the initial spacing between the diaphragm 31 and the convex part 122 can be ensured, and the diaphragm 31 is not easily adsorbed to the through hole 111 due to negative pressure in the subsequent formation process, thereby preventing the through hole 111 from being blocked.

[0073] In some embodiments, the heights of the plurality of convex parts 122 protruding from the insulating member 12 are the same.

[0074] By setting the heights of the plurality of convex parts 122 protruding from the insulating member 12 to be the same, the molding of the insulating member 12 can be facilitated, and under the premise of satisfying the above relationships, the balanced support effect of each convex part 122 can be ensured, and the convex part 122 can better prevent blockage.

[0075] In some embodiments, along the extension direction of the convex part 122, the cross-sectional area of the convex part 122 parallel to the plane in which the insulating member 12 is located gradually decreases.

[0076] This facilitates injection molding of the insulating member 12 and reduces process difficulty.

[0077] In some embodiments, the number of convex parts 122 is N, where 2≤N≤8.

[0078] By limiting the lower limit of the number of convex parts 122, the situation of insufficient support effect of the diaphragm 31 due to too few convex parts can be avoided, and the diaphragm 31 is prevented from blocking the through hole 111 and affecting the secondary injection of the battery. By limiting the upper limit of the number of convex parts 122, material waste can be avoided while ensuring the support effect of the diaphragm 31, and too many convex parts 122 can also affect the injection efficiency.

[0079] In some embodiments, the avoiding hole 121 is a circular hole; the plurality of convex portions 122 are evenly distributed around the avoiding hole 121.

[0080] By evenly distributing the plurality of convex portions 122 around the avoiding hole 121, each convex portion 122 can have a balanced supporting effect on the diaphragm 31, better play a role in preventing blockage, and avoid the diaphragm 31 from blocking the through hole 111, affecting the secondary liquid injection of the battery.

[0081] Obviously, the above embodiments are only examples for clearly illustrating, and are not a limitation on the embodiments. Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the present application.

Claims

1. A single cell, characterized by, The application relates to a battery cover plate assembly and a battery. The battery cover plate assembly (1) is sealedly arranged at an opening of the shell (2), and the battery cover plate assembly (1) and the shell (2) form a containing cavity. The battery core (3) is arranged in the containing cavity. The battery cover plate assembly (1) comprises a metal cover plate (11) with a through hole (111) formed therein, an insulating piece (12) arranged on one side of the metal cover plate (11), and a plurality of protrusions (122) formed on the side of the insulating piece (12) away from the metal cover plate (11). The distance between the two protrusions (122) farthest from each other in the plurality of protrusions (122) is defined as p. The height of the protrusion (122) with the highest height protruding from the insulating piece (12) among the two protrusions (122) farthest from each other is defined as q. The insulating piece (12) is located between the battery core (3) and the battery cover plate assembly (1). The battery core (3) comprises a diaphragm (31) with a porosity c, wherein the value range of c is 30%<=c<=50%, and p / q satisfies 2<=p / q<=18. The battery core (3) is a laminated battery core, and the battery core (3) comprises a battery core body, an insulating film and a tab (32). The leading end of the tab (32) is located on the different side of the battery cover plate assembly (1) and the battery, and the shortest distance between the insulating film and the protrusion (122) is m, wherein the value range of m is 0mm<=m<=4mm. The number of the protrusions (122) is N, wherein 2<=N<=8.

2. The cell according to claim 1, wherein The value range of p is 6mm<=p<=20mm, and the value range of q is 1mm<=q<=6mm.

3. The cell according to claim 1, wherein The thickness of the diaphragm (31) is d, wherein the value range of d is 4um<=d<=28um, and p / q satisfies 2<=p / q<=12.

5.

4. The cell according to claim 1, wherein The battery core (3) further comprises an insulating fixing layer (4) arranged at least partially on the side of the battery core (3) close to the battery cover plate assembly (1). Along the length direction of the metal cover plate (11), the length of the insulating fixing layer (4) is defined as L1, and the length of the battery core (3) is defined as L2, and 0.05<=L1 / L2<=0.4 is satisfied.

5. The cell according to claim 1, wherein P / q satisfies 2.2<=p / q<=18.

6. The cell according to claim 1, wherein The heights of the plurality of protrusions (122) protruding from the insulating piece (12) are the same.

7. The cell according to claim 1, wherein Along the extension direction of the protrusion (122), the cross-sectional area of the protrusion (122) gradually decreases in parallel to the plane where the insulating piece (12) is located.

8. The cell according to any one of claims 1, 3 to 5, characterized in that, The avoiding hole (121) is a circular hole, and the plurality of protrusions (122) surround the avoiding hole (121) and are uniformly distributed.

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