Cover assembly, battery and battery pack

Abstract

This utility model relates to the field of battery technology and discloses a cover plate assembly, a battery, and a battery pack, comprising: a cover plate body with a through-hole for an electrode post along its thickness direction, the width of the cover plate body being d along its width direction; and an electrode post passing through the through-hole, the electrode post comprising a first segment, the length of the first segment being a along its length direction, and the width of the first segment being b along its width direction, satisfying a > b and 3mm ≤ b ≤ (d-6)mm; wherein d, a, and b are all in mm. This utility model facilitates the processing and forming of the electrode post while reducing the expansion deformation of the cover plate body along its width direction, ensuring the assembly accuracy of the cover plate assembly and the housing.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to cover plate assembly, battery and battery pack. Background Technology

[0002] The cover assembly is a crucial component of a battery, serving not only to encapsulate the internal structure but also to facilitate current input and output. Among these components, the terminals are critical for current delivery. With increasingly stringent industry requirements for battery charge / discharge rates, the demand for higher current-carrying capacity in the terminals is also growing. Current technologies typically employ cylindrical terminals, and to enhance their current-carrying capacity, at least two terminals are usually used, leading to a complex assembly process and low assembly efficiency for the cover assembly. Utility Model Content

[0003] In view of this, the present invention provides a cover plate assembly, a battery and a battery pack to solve the problems of complex assembly process and low assembly efficiency of the cover plate assembly in the prior art.

[0004] In a first aspect, this utility model provides a cover plate assembly, comprising:

[0005] The cover plate body has a through-hole in the thickness direction and the width of the cover plate body is d in the width direction.

[0006] An electrode post is inserted through the electrode post hole. The electrode post includes a first post segment. The length of the first post segment is a, and the width of the first post segment is b, satisfying a > b and 3 mm ≤ b ≤ (d-6) mm. Wherein, the units of d, a, and b are all mm.

[0007] Beneficial effects: While facilitating the processing and forming of the pole post, it reduces the expansion deformation of the cover plate body along the width direction, ensuring the assembly accuracy of the cover plate assembly and the housing.

[0008] In one optional embodiment, the width d of the cover plate body satisfies 9mm≤d≤30mm.

[0009] In one alternative implementation, the length of the cover plate body along the length direction is c, satisfying a≤1 / 5×c.

[0010] Beneficial effects: It avoids the pole occupying too much space along the length direction, which facilitates the layout of other components on the cover plate body.

[0011] In one optional embodiment, the first column segment has a first cross section perpendicular to the thickness direction. The outer contour of the first cross section includes two straight segments and two arc segments. The two straight segments are arranged relatively spaced apart along the width direction, and the two arc segments are arranged relatively spaced apart along the length direction. The two arc segments are respectively connected to the two ends of the two straight segments on the same side.

[0012] Beneficial effects: Setting the first segment of the electrode post as a cylindrical body with an elongated oval cross-section facilitates the processing and shaping of the electrode post while improving its current carrying capacity.

[0013] In one optional embodiment, the cover plate body has a first surface and a second surface disposed opposite to each other along the thickness direction. The cover plate assembly further includes a riveting member disposed on the first surface. The riveting member has a riveting hole extending through it along the thickness direction and a riveting surface is formed thereon. The pole post passes through both the pole post hole and the riveting hole. The pole post further includes a second column segment riveted to the riveting surface and connected to the end of the first column segment away from the first surface.

[0014] Beneficial effect: The second column segment is formed by riveting and deforming the pole post, and the pole post and the riveting component are fixed to the cover plate body by riveting the second column segment to the riveting component.

[0015] In one optional embodiment, the pole post further includes a third column segment and a pole post base plate. The third column segment is connected to the end of the first column segment away from the second column segment, and the pole post base plate is connected to the end of the third column segment away from the first column segment. The third column segment passes through the pole post hole, and the cover plate body is sandwiched between the riveting member and the pole post base plate.

[0016] Beneficial effects: By utilizing the limiting effect of the pole base plate on one side of the cover plate body and the riveting effect of the second pole section and the riveting parts on the other side of the cover plate body, the pole can be fixedly installed.

[0017] In one alternative embodiment, the cover plate assembly further includes an upper insulating member, at least a portion of which is sandwiched between the riveted member and the first surface; and / or,

[0018] The cover plate assembly further includes a lower insulating member disposed on the second surface.

[0019] Beneficial effects: By setting the upper insulating component, insulation between the riveted component and the cover plate body is achieved; by setting the lower insulating component, insulation between the cover plate body and the battery cell is achieved.

[0020] In one alternative embodiment, the cover plate assembly further includes a seal disposed around the third column segment and inserted into the pole hole.

[0021] Beneficial effects: By setting a sealing element, a sealing effect is achieved between the pole and the cover plate body, ensuring the sealing effect of the cover plate assembly.

[0022] Secondly, this utility model also provides a battery, comprising:

[0023] The housing has an opening at least at one end;

[0024] The aforementioned cover assembly is connected to the housing and seals the opening to enclose and form an accommodating space;

[0025] The battery cell is disposed within the receiving space.

[0026] Thirdly, this utility model also provides a battery pack, including the aforementioned battery. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of a cover plate assembly according to an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 The exploded view of the cover plate assembly is shown.

[0030] Figure 3 This is a structural schematic diagram of the first cross section of an embodiment of the present utility model;

[0031] Figure 4 for Figure 1 Top view of the cover plate assembly shown;

[0032] Figure 5 for Figure 4 A cross-sectional view of the middle cover plate assembly along the AA direction;

[0033] Figure 6 for Figure 5 A partially enlarged schematic diagram of the middle cover plate assembly.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Cover plate body; 11. Pole post hole; 12. First surface; 13. Second surface; 2. Pole post; 21. First column segment; 211. First cross section; 2111. Straight segment; 2112. Arc segment; 22. Second column segment; 23. Third column segment; 24. Pole post base plate; 3. Riveting component; 31. Riveting hole; 32. Riveting surface; 4. Upper insulating component; 5. Lower insulating component; 6. Sealing component. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, a cover plate assembly is provided, comprising: a cover plate body 1 having a through-hole 11 along the thickness direction, the width of the cover plate body 1 being d along the width direction; a pole 2 passing through the through-hole 11, the pole 2 including a first pole segment 21, the length of the first pole segment 21 being a along the length direction, and the width of the first pole segment 21 being b along the width direction, satisfying a>b, 3mm≤b≤(d-6)mm; wherein, the units of d, a, and b are all mm.

[0039] The cover plate assembly of this embodiment facilitates the processing and forming of the pole post 2, while reducing the expansion deformation of the cover plate body 1 along the width direction, and ensuring the assembly accuracy of the cover plate assembly and the shell.

[0040] It is worth noting that if the value of b is too small, it will not meet the molding process requirements of the electrode post 2 and will not be convenient for the processing and molding of the electrode post 2; if the value of b is too large, the distance between the edge of the first column segment 21 and the cover plate body 1 along the width direction will be too close, resulting in excessive expansion deformation of the cover plate body 1 along the width direction after the electrode post 2 and the cover plate body 1 are assembled, which will lead to poor assembly accuracy of the cover plate assembly and the shell, affecting the assembly quality and airtightness of the battery.

[0041] It should be noted that the cover plate assembly in this embodiment is applied to a blade battery. The cover plate body 1 of the blade battery has a large aspect ratio, that is, the length of the cover plate body 1 is large and the width is small. Currently, the industry has increasingly higher requirements for the charge and discharge rate of batteries, which requires an increase in the current carrying capacity of the terminal post 2, that is, an increase in the cross-sectional area of ​​the terminal post 2 in the direction perpendicular to the thickness. In the prior art, the cross-section of the terminal post 2 in the direction perpendicular to the thickness is usually circular. Since the width of the cover plate body 1 of the blade battery is small, it is not convenient to increase the diameter of the circle. Therefore, the prior art usually sets two cylindrical terminal posts 2 to increase the current carrying capacity. Such a setting leads to a complicated assembly process and low assembly efficiency of the cover plate assembly. In this embodiment, the dimension of the terminal post 2 along the length direction of the cover plate body 1 is increased (that is, a>b), which can improve the current carrying capacity of the terminal post 2 without increasing the number of terminal posts 2, thus ensuring assembly efficiency.

[0042] Specifically, in one embodiment, such as Figure 4 As shown, the width d of the cover plate body 1 satisfies 9mm≤d≤30mm.

[0043] Optionally, d can be any value among 9mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, and 30mm, or a value between any two of these values.

[0044] In one embodiment, such as Figure 4 As shown, the length of the cover plate body 1 along the length direction is c, which satisfies a ≤ 1 / 5 × c. That is, the length a of the first column segment 21 satisfies b < a ≤ 1 / 5 × c. This arrangement avoids the pole column 2 occupying too much space along the length direction, and facilitates the layout of other components on the cover plate body 1.

[0045] It is worth noting that if the value of a is too large, the pole 2 will occupy too much space on the cover plate body 1, resulting in too little remaining space on the cover plate body 1, which is not convenient for the layout of other components on the cover plate body 1 (such as injection holes, QR codes, positive and negative electrode markings, etc.).

[0046] In one embodiment, such as Figure 3 As shown, the first column segment 21 has a first cross-section 211 perpendicular to the thickness direction. The outer contour of the first cross-section 211 includes two straight segments 2111 and two arc segments 2112. The two straight segments 2111 are spaced apart relative to each other along the width direction, and the two arc segments 2112 are spaced apart relative to each other along the length direction. The two arc segments 2112 are respectively connected to the two ends of the two straight segments 2111 on the same side. With this configuration, the first column segment 21 of the pole post 2 is set as a column with an oblong cross-section (also known as a racetrack shape), which facilitates the processing and shaping of the pole post 2 while improving the current carrying capacity of the pole post 2.

[0047] It is worth noting that the straight segment 2111 extends along the length direction of the cover plate body 1, and the two straight segments 2111 are spaced apart along the width direction of the cover plate body 1. That is, the length direction of the first column segment 21 is in the same direction as the length direction of the cover plate body 1, and the width direction of the first column segment 21 is in the same direction as the width direction of the cover plate body 1.

[0048] In one embodiment, such as Figure 5 and Figure 6 As shown, the cover plate body 1 has a first surface 12 and a second surface 13 arranged opposite to each other along the thickness direction. The cover plate assembly also includes a riveting member 3, which is disposed on the first surface 12. The riveting member 3 has a riveting hole 31 extending through it along the thickness direction, and a riveting surface 32 is formed on it. The pole post 2 passes through both the pole post hole 11 and the riveting hole 31. The pole post 2 also includes a second column segment 22, which is riveted to the riveting surface 32 and connected to the end of the first column segment 21 away from the first surface 12. With this arrangement, the second column segment 22 is formed by the riveting deformation of the pole post 2, and is fixed to the riveting member 3 by the second column segment 22, thereby fixing the pole post 2 and the riveting member 3 on the cover plate body 1.

[0049] It is worth noting that before riveting the pole post 2, the original shape of the second column segment 22 (before deformation) is the same as the shape of the first column segment 21. Riveting the original second column segment 22 deforms it so that the deformed second column segment 22 can be riveted to the riveting surface 32 of the riveting member 3, thereby fixing the pole post 2, the riveting member 3, and the cover plate body 1.

[0050] In one embodiment, such as Figure 5 and Figure 6 As shown, the pole post 2 also includes a third pole segment 23 and a pole post 2 base plate. The third pole segment 23 is connected to the end of the first pole segment 21 away from the second pole segment 22. The pole post 2 base plate is connected to the end of the third pole segment 23 away from the first pole segment 21. The third pole segment 23 passes through the pole post hole 11. The cover plate body 1 is sandwiched between the riveting part 3 and the pole post 2 base plate.

[0051] It is worth noting that, such as Figure 6 As shown, the outer wall of the third column segment 23 protrudes outward from the outer wall of the first column segment 21 to form a stepped surface at the connection between the first column segment 21 and the third column segment 23, and the side of the rivet 3 facing the first surface 12 abuts against the stepped surface.

[0052] It should be noted that the pole post 2 is fixedly installed by using the limiting effect of the base plate of the pole post 2 on one side of the cover plate body 1 and the riveting effect of the second column section 22 and the riveting piece 3 on the other side of the cover plate body 1.

[0053] In one embodiment, such as Figure 2 and Figure 6 As shown, the cover plate assembly also includes an upper insulating member 4, at least a portion of which is sandwiched between the riveting member 3 and the first surface 12. By providing the upper insulating member 4, insulation between the riveting member 3 and the cover plate body 1 is achieved.

[0054] In one embodiment, such as Figure 1 , Figure 2 and Figure 5 As shown, the cover plate assembly also includes a lower insulating member 5, which is disposed on the second surface 13. By providing the lower insulating member 5, insulation between the cover plate body 1 and the battery cell is achieved.

[0055] In one embodiment, such as Figure 6 As shown, the cover plate assembly also includes a sealing element 6, which surrounds the third column segment 23 and is inserted into the pole post hole 11. By providing the sealing element 6, a sealing effect is achieved between the pole post 2 and the cover plate body 1, ensuring the sealing effect of the cover plate assembly.

[0056] The following observations examine the assembly of cover plate bodies 1 and pole posts 2 with different sizes. The assembly results of the embodiments and comparative examples are shown in Table 1. The embodiments refer to cover plate bodies 1 and pole posts 2 that meet the requirements of this embodiment, while the comparative examples refer to cover plate bodies 1 and pole posts 2 that do not meet the requirements of this embodiment.

[0057] Table 1 Assembly details of the embodiments and comparative examples

[0058]

[0059] As can be seen from Table 1, in Examples 1 to 10, the value of a satisfies a≤1 / 5×c, and the value of b satisfies 3mm≤b≤(d-6)mm. Therefore, in Examples 1 to 10, it is convenient to process and form the electrode post 2, and the electrode post 2 and the cover plate body 1 are well assembled. The cover plate body 1 does not undergo expansion deformation along the width direction, and the cover plate body 1 has sufficient remaining space along the length direction, which is convenient for the arrangement of structures such as injection holes, QR codes, and positive and negative electrode markings.

[0060] As can be seen from Table 1, in Comparative Example 1 and Comparative Example 2, the value of b is less than 3 mm. The value of b is too small, which does not meet the molding process requirements of the pole post 2 and is not convenient for the processing and molding of the pole post 2.

[0061] As can be seen from Table 1, in Comparative Examples 3 and 4, the value of b is greater than (d-6) mm. The value of b is too large, and the edge distance between the first column segment 21 and the cover plate body 1 along the width direction is too close. This results in excessive expansion deformation of the cover plate body 1 along the width direction after the electrode post 2 and the cover plate body 1 are assembled. Consequently, the assembly accuracy of the cover plate assembly and the shell is poor, affecting the assembly quality and airtightness of the battery.

[0062] As can be seen from Table 1, in Comparative Examples 5 and 6, the value of a is greater than 1 / 5×c. The value of a is too large, and the pole 2 occupies too much space on the cover plate body 1, resulting in too little remaining space on the cover plate body 1, which is not convenient for the layout of structures such as the liquid injection hole, QR code, positive and negative electrode markings on the cover plate body 1.

[0063] According to an embodiment of the present invention, another aspect provides a battery comprising:

[0064] The housing has an opening at least at one end;

[0065] The aforementioned cover assembly connects to the housing and seals the opening to enclose and form an accommodating space;

[0066] The battery cell is housed within the containment space.

[0067] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, including the battery described above.

[0068] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body has a through-hole in the thickness direction and the width of the cover plate body is d in the width direction. An electrode post is inserted through the electrode post hole. The electrode post includes a first post segment. The length of the first post segment is a, and the width of the first post segment is b, satisfying a > b and 3 mm ≤ b ≤ (d-6) mm. Wherein, the units of d, a, and b are all mm.

2. The cover plate assembly according to claim 1, characterized in that, The width d of the cover plate body satisfies 9mm≤d≤30mm.

3. The cover plate assembly according to claim 1 or 2, characterized in that, Along the length direction, the length of the cover plate body is c, which satisfies a≤1 / 5×c.

4. The cover plate assembly according to claim 1 or 2, characterized in that, The first column segment has a first cross section perpendicular to the thickness direction. The outer contour of the first cross section includes two straight segments and two circular arc segments. The two straight segments are arranged relatively spaced apart along the width direction, and the two circular arc segments are arranged relatively spaced apart along the length direction. The two circular arc segments are respectively connected to the two ends of the two straight segments on the same side.

5. The cover plate assembly according to claim 1 or 2, characterized in that, The cover plate body has a first surface and a second surface that are arranged opposite to each other along the thickness direction. The cover plate assembly also includes a riveting member, which is disposed on the first surface. The riveting member has a riveting hole that extends through it along the thickness direction and has a riveting surface. The pole post is simultaneously inserted through the pole post hole and the riveting hole. The pole post also includes a second column segment, which is riveted to the riveting surface and connected to the end of the first column segment away from the first surface.

6. The cover plate assembly according to claim 5, characterized in that, The pole post further includes a third column segment and a pole post base plate. The third column segment is connected to the end of the first column segment away from the second column segment. The pole post base plate is connected to the end of the third column segment away from the first column segment. The third column segment passes through the pole post hole. The cover plate body is sandwiched between the riveting member and the pole post base plate.

7. The cover plate assembly according to claim 5, characterized in that, The cover plate assembly further includes an upper insulating member, at least a portion of which is sandwiched between the riveted member and the first surface; and / or, The cover plate assembly further includes a lower insulating member disposed on the second surface.

8. The cover plate assembly according to claim 6, characterized in that, The cover plate assembly also includes a seal that surrounds the third column segment and is inserted into the pole hole.

9. A battery, characterized in that, include: The housing has an opening at least at one end; The cover plate assembly according to any one of claims 1 to 8 is connected to the housing and seals the opening to enclose and form a receiving space; The battery cell is disposed within the receiving space.

10. A battery pack, characterized in that, Includes the battery as described in claim 9.

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