Cover plate, battery cell and battery pack

Abstract

The utility model relates to battery technology field discloses a kind of cover plate, electric core and battery package, the cover plate of the utility model includes cover plate body, first insulating part, second insulating part and pole. Cover plate cancels riveting block, and first insulating part is flattened to make it crimped in the inside of protruding portion on connecting wall. Cover plate cancels riveting block, can reduce the height of pole, can reduce the material of pole, to be able to reduce the cost of cover plate;And the height of pole outside cover plate body is less than the height of pole outside cover plate body when setting riveting block, beneficial to improve the volumetric energy density of electric core and battery package. The outer diameter D1 of connecting wall and the inner diameter D2 of protruding portion satisfy 0.1mm≤(D2-D1) / 2≤0.52mm, so that it can avoid the diameter of connecting wall to be flattened too large and interfere with the protruding portion of first insulating part, can prevent the diameter of connecting wall to be too large and damage first insulating part by outwardly straining, beneficial to guarantee the insulation protection effect of first insulating part.

Description

Technical Field

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

[0002] The existing cover plate includes a cover plate body, terminals, a first insulating component, a second insulating component, a sealing ring, and a riveting block. The first insulating component is located on the outer surface of the cover plate body, the riveting block is located on the first insulating component, and the second insulating component is located on the outer surface of the cover plate body facing the inner side. The terminals pass through the second insulating component, the cover plate body, and the riveting block and are then riveted and fixed to the riveting block. With this structure, the riveting block is relatively thick, and the terminals need to pass through it, resulting in a high terminal height and increased material usage, thus increasing the material cost of the cover plate. Furthermore, the significant height occupied by the riveting block and terminals on the outer surface of the cover plate body will affect the volumetric energy density of the battery cells and the battery pack. Utility Model Content

[0003] In view of this, the present invention provides a cover plate, a battery cell, and a battery pack to solve the problems in the prior art where the cover plate is riveted to the terminal post by a riveting block, resulting in high terminal post height, high cost, and impact on the volumetric energy density of the battery cell and battery pack.

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

[0005] Cover plate body;

[0006] A first insulating element is disposed on the side surface of the cover plate body facing the outside of the cover plate, and the circumferential outer edge of the first insulating element faces the protrusion protruding from the outside of the cover plate.

[0007] The second insulating element is disposed on the surface of the cover plate body facing the inside of the cover plate;

[0008] The pole includes a base plate and a column portion disposed on the base plate. The column portion has a connecting wall on its circumferential outer edge facing the outer side of the cover plate. After the pole is riveted, the connecting wall is pressed against the first insulating member on the circumferential inner side of the protrusion. The outer diameter of the connecting wall is D1, and the inner diameter of the protrusion is D2. 0.1mm≤(D2-D1) / 2≤0.52mm, where D1 and D2 are in mm.

[0009] Beneficial effects: This cover plate structure eliminates the riveting block. By setting a connecting wall on the pole, before riveting, the connecting wall is located on the side surface of the pole facing the outside of the cover plate. The pole passes through the cover plate body and the first insulating member, flattening the connecting wall so that it presses against the first insulating member inside the protrusion, thereby fixing the pole to the cover plate body. Eliminating the riveting block reduces the height of the pole and the amount of material used, thus reducing the cost of the cover plate. Furthermore, the height of the pole extending beyond the outside of the cover plate body is less than that when the riveting block is used, which is beneficial for improving the volumetric energy density of the cell and battery pack. The outer diameter D1 of the connecting wall and the inner diameter D2 of the protrusion satisfy 0.1mm≤(D2-D1) / 2≤0.52mm. This avoids the connecting wall becoming too large after being flattened, which could interfere with the protrusion of the first insulating member. It also prevents the connecting wall from becoming too large and damaging the first insulating member, thus ensuring the insulating and protective function of the first insulating member.

[0010] In one optional embodiment, the outer diameter of the protrusion is D3, where 0.9mm ≤ (D3-D2) / 2 ≤ 2mm, and D3 is in mm.

[0011] Beneficial effects: (D3-D2) / 2 is the wall thickness of the protrusion extending radially along the first insulating part. 0.9mm≤(D3-D2) / 2≤2mm, which can ensure the minimum thickness of the protrusion, prevent the protrusion from cracking, and ensure the insulating and protective function of the protrusion. At the same time, it can also avoid the waste of materials and space caused by the excessive thickness of the protrusion.

[0012] In one alternative embodiment, the diameter of the column portion is D4, where 16mm ≤ D4 ≤ 32mm.

[0013] Beneficial effects: This ensures the lower limit of the diameter of the column body, which guarantees the current carrying capacity of the electrode, and also avoids excessive material usage in the electrode due to an excessively large diameter of the column body, thus helping to control the cost of the cover plate.

[0014] In one alternative implementation, 21mm≤D1≤37mm, 21.2mm≤D2≤37.2mm, and 24.2mm≤D3≤40.2mm.

[0015] In one optional embodiment, the cover plate body has a positioning protrusion circumferentially arranged on the side facing the second insulating member, and the second insulating member has a slot that engages with the positioning protrusion on the side facing the cover plate body.

[0016] Beneficial effects: The positioning protrusion and the slot can cooperate to prevent the second insulating component from moving relative to the cover plate body and can position the second insulating component on the cover plate body.

[0017] In one optional embodiment, a planar segment is provided on the peripheral sidewall of the base plate, the slot is located on the peripheral outer side of the base plate, the end of the second insulating member near the base plate is provided with a limiting step that engages with the base plate, and the bottom of the slot is located on the side of the base plate facing the outer side of the cover plate near the inner side of the cover plate.

[0018] Beneficial effects: When the pole is subjected to torque, the force on the pole is transmitted to the second insulating component and the cover plate body. The positioning protrusion and the slot are engaged to position the second insulating component on the cover plate body. The bottom plate and the limiting step of the second insulating component are engaged to position the pole. The flat section of the pole itself abuts against the limiting step to prevent the pole from rotating relative to the cover plate body.

[0019] In one alternative embodiment, a positioning groove is provided in the middle of the side surface of the column portion facing the outside of the cover plate.

[0020] Beneficial effects: During the production of the electrode post, it is convenient to determine the center position of the electrode post through the positioning groove. In the automated production process, it is convenient to grasp the center point of the electrode post according to the positioning groove, and then position the connecting plate according to the center point of the electrode post. After positioning, the connecting plate is welded to the post body.

[0021] In one alternative embodiment, the second insulating member has a mounting hole through which the column portion passes, and a positioning post is provided on one side surface of the second insulating member facing the inner side of the cover plate. The positioning post is located on the side of the mounting hole, and the connecting piece of the battery cell is adapted to be inserted into the positioning post.

[0022] Beneficial effect: This allows the connecting piece to be pre-positioned using the positioning post during welding, making it easier to weld the connecting piece onto the base plate of the pole post later.

[0023] Secondly, this utility model also provides a battery cell, including the cover plate described in any one of the above descriptions. The battery cell including the cover plate has the same technical effects as the cover plate, and will not be described again here.

[0024] Thirdly, this utility model also provides a battery pack, including the aforementioned battery cells. The battery pack includes a cover plate, which has the same technical effects as the cover plate, and will not be described in detail here. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a top view of a cover plate according to an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 Sectional view along axis AA;

[0028] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0029] Figure 4 for Figure 1 BB-direction sectional view;

[0030] Figure 5 for Figure 1 A schematic diagram of the connecting wall of the central pole before riveting;

[0031] Figure 6 This is a bottom view of a cover plate according to an embodiment of the present utility model;

[0032] Figure 7 This is an exploded view of a cover plate according to an embodiment of the present utility model;

[0033] Figure 8 for Figure 7 A magnified view of part B in the middle.

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

[0035] 1. Cover plate body; 11. Positioning protrusion; 2. First insulating component; 21. Protrusion; 3. Second insulating component; 31. Slot; 32. Positioning post; 4. Pole post; 41. Base plate; 411. Flat section; 42. Column part; 421. Positioning groove; 43. Connecting wall. 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 Figures 1 to 8 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, a cover plate is provided, comprising a cover plate body 1, a first insulating member 2, a second insulating member 3, and a pole post 4.

[0039] The first insulating member 2 is disposed on the outer side of the cover plate body 1 facing the outside of the cover plate, and the outer circumferential edge of the first insulating member 2 is provided with a protruding and folded protrusion 21 facing the cover plate; the second insulating member 3 is disposed on the inner side of the cover plate body 1 facing the inside of the cover plate; the pole post 4 includes a base plate 41 and a column part 42 disposed on the base plate 41, and the outer circumferential edge of the column part 42 facing the outside of the cover plate is provided with a connecting wall 43. After the pole post 4 is riveted, the connecting wall 43 is pressed onto the first insulating member 2 on the inner circumferential side of the protrusion 21; the outer diameter of the connecting wall 43 is D1, the inner diameter of the protrusion 21 is D2, 0.1mm≤(D2-D1) / 2≤0.52mm, and the units of D1 and D2 are mm.

[0040] The outer diameter of the connecting wall 43 is the diameter of the outer peripheral wall after the connecting arm is flattened, the inner diameter of the protrusion 21 is the diameter of the inner wall surface of the protrusion 21, and the outer diameter of the protrusion 21 is the diameter of its outer wall surface.

[0041] This structure eliminates the rivet block in the cover plate. A connecting wall 43 is provided on the terminal post 4. Before riveting, the connecting wall 43 is located on the side surface of the post portion 42 facing the outer side of the cover plate. The post portion 42 passes through the cover plate body 1 and the first insulating member 2, pressing the connecting wall 43 flat to press it against the first insulating member 2 inside the protrusion 21, thereby fixing the terminal post 4 to the cover plate body 1. Eliminating the rivet block reduces the height of the terminal post 4, reduces the material used, and thus reduces the cost of the cover plate. Furthermore, the height of the terminal post 4 extending beyond the cover plate body 1 is less than the height when the rivet block is present, which is beneficial for improving the volumetric energy density of the cell and battery pack. The outer diameter D1 of the connecting wall 43 and the inner diameter D2 of the protrusion 21 satisfy 0.1mm≤(D2-D1) / 2≤0.52mm. This can prevent the diameter of the connecting wall 43 from becoming too large after being flattened, thus avoiding interference with the protrusion 21 of the first insulating member 2. It can also prevent the diameter of the connecting wall 43 from becoming too large and opening outward to damage the first insulating member 2, which is beneficial to ensuring the insulating and protective function of the first insulating member 2.

[0042] like Figure 3 As shown, in some embodiments, the outer diameter of the protrusion 21 is D3, 0.9mm≤(D3-D2) / 2≤2mm, where D3 is in mm. (D3-D2) / 2 is the wall thickness of the protrusion 21 extending radially along the first insulating member 2, 0.9mm≤(D3-D2) / 2≤2mm. This ensures the minimum thickness of the protrusion 21, preventing cracking and guaranteeing its insulating and protective function; it also avoids excessive thickness of the protrusion 21, which would waste material and space.

[0043] like Figure 3As shown, the diameter of the column portion 42 in the middle of the height direction of the pole post 4 is the smallest, and the diameter of the column portion 42 affects the current carrying capacity of the pole post 4. In some embodiments, the diameter of the column portion 42 is D4, 16mm≤D4≤32mm. This ensures the lower limit of the diameter of the column portion 42, which guarantees the current carrying capacity of the pole post 4. At the same time, it also avoids excessive material usage in the pole post 4 due to an excessively large diameter of the column portion 42, which helps control the cost of the cover plate.

[0044] In some alternative embodiments, 21mm≤D1≤37mm, 21.2mm≤D2≤37.2mm, and 24.2mm≤D3≤40.2mm.

[0045] In some embodiments, the cover plate body 1 is provided with a connecting hole for the pole post 4 to pass through. The diameter of the connecting hole is D, and the outer diameter of the protrusion 21 is larger than the diameter of the connecting hole, and satisfies 1.5mm≤(D1-D) / 2≤2mm. This ensures the width of the connecting wall 43 overlapping the solid part of the cover plate body 1, so that the pole post 4 can be stably held on the cover plate body 1. When the pole post 4 is subjected to external force, it can prevent the pole post 4 from falling off the cover plate body 1.

[0046] like Figure 3 and Figure 6 As shown, the cover plate body 1 has a positioning protrusion 11 on the side facing the second insulating member 3, and the second insulating member 3 has a slot 31 on the side facing the cover plate body 1 that engages with the positioning protrusion 11. The positioning protrusion 11 and the slot 31 engage with each other to prevent the second insulating member 3 from moving relative to the cover plate body 1 and to position the second insulating member 3 on the cover plate body 1.

[0047] In some embodiments, a planar segment 411 is provided on the peripheral sidewall of the base plate 41, and the slot 31 is located on the circumferential outer side of the base plate 41. The end of the second insulating member 3 near the base plate 41 is provided with a limiting step that engages with the base plate 41, and the bottom of the slot 31 is located on the side of the base plate 41 facing the outer side of the cover plate, close to the inner side of the cover plate. When the pole post 4 is subjected to torque, the force on the pole post 4 is transmitted to the second insulating member 3 and the cover plate body 1. The positioning protrusion 11 engages with the slot 31 to position the second insulating member 3 on the cover plate body 1. The base plate 41 engages with the limiting step of the second insulating member 3 to position the pole post 4. The planar segment 411 of the pole post 4 abuts against the limiting step to prevent the pole post 4 from rotating relative to the cover plate body 1.

[0048] Optionally, such as Figure 3 and Figure 8As shown, in some embodiments, the second insulating member 3 is provided with a mounting hole for the column portion 42 to pass through. The slot 31 and the positioning protrusion 11 are both arranged around the mounting hole. The circumferential path of the slot 31 on the second insulating member is non-circular, and the circumferential path of the positioning protrusion 11 is also non-circular. The positioning protrusion 11 is inserted into the slot 31 to realize the insertion and positioning of the second insulating member 3 and the cover plate body 1. The insertion and mating structure is simple and reliable.

[0049] like Figure 3 and Figure 4 As shown, after the connecting wall 43 is flattened, it is flush with the outer surface of the column portion 42 facing the cover plate. The outer surfaces of the connecting wall 43 and the column portion 42 facing the cover plate protrude from the outer surface of the protrusion 21 facing the cover plate, which facilitates the welding of connecting tabs onto the column portion 42 during subsequent cell assembly. The inner surface of the base plate 41 protrudes from the inner surface of the cover plate, so that the connecting tabs can be welded onto the base plate 41.

[0050] like Figure 3 and Figure 4 As shown, in some embodiments, the center of the side surface of the column portion 42 facing the outer side of the cover plate is provided with a positioning groove 421. During the production process of the pole post 4, the center position of the pole post 4 can be easily determined by the positioning groove 421. During the automated production process, the center point of the pole post 4 can be easily grasped according to the positioning groove 421, and then the connecting plate can be positioned according to the center point of the pole post 4. After positioning, the connecting plate is welded to the column portion 42.

[0051] like Figure 3 and Figure 6 As shown, in some embodiments, the second insulating member 3 has a positioning post 32 on one side surface facing the inside of the cover plate. The positioning post 32 is located on the side of the mounting hole. The connecting piece of the battery cell is suitable for insertion into the positioning post 32. In this way, when welding the connecting piece, the connecting piece can be pre-positioned by the positioning post 32, which facilitates the subsequent welding of the connecting piece to the base plate 41 of the pole post 4.

[0052] According to an embodiment of the present invention, another aspect provides a battery cell including the cover plate of any of the above.

[0053] In this cell structure, the rivet block is eliminated from the cover plate, which reduces the height of the terminal post 4 and the material used for the terminal post 4, thereby reducing the cost of the cover plate. Furthermore, the height of the terminal post 4 extending beyond the cover plate body 1 is less than the height when the rivet block is present, which helps to improve the volumetric energy density of the cell. The outer diameter D1 of the connecting wall 43 and the inner diameter D2 of the protrusion 21 satisfy 0.1mm≤(D2-D1) / 2≤0.52mm. This prevents the connecting wall 43 from becoming too large after being flattened, thus avoiding interference with the protrusion 21 of the first insulating member 2. It also prevents the connecting wall 43 from becoming too large and opening outwards, damaging the first insulating member 2, thus ensuring the insulating and protective function of the first insulating member 2.

[0054] According to an embodiment of the present invention, another aspect provides a battery pack including the battery cells described in the above embodiments.

[0055] In this battery pack structure, the rivet block is eliminated from the cover plate, which reduces the height of the terminal post 4 and the amount of material used, thereby reducing the cost of the cover plate. Furthermore, the height of the terminal post 4 extending beyond the cover plate body 1 is less than the height when the rivet block is present, which helps to improve the volumetric energy density of the battery pack. The outer diameter D1 of the connecting wall 43 and the inner diameter D2 of the protrusion 21 satisfy 0.1mm≤(D2-D1) / 2≤0.52mm. This prevents the connecting wall 43 from becoming too large after being flattened, thus avoiding interference with the protrusion 21 of the first insulating member 2. It also prevents the connecting wall 43 from becoming too large and opening outwards, damaging the first insulating member 2, thus ensuring the insulating and protective function of the first insulating member 2.

[0056] 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, characterized in that, include: Cover plate body; A first insulating element is disposed on the side surface of the cover plate body facing the outside of the cover plate, and the outer edge of the first insulating element is provided with a protrusion protruding outward toward the outside of the cover plate. The second insulating element is disposed on the surface of the cover plate body facing the inside of the cover plate; The pole includes a base plate and a column portion disposed on the base plate. The column portion has a connecting wall on its circumferential outer edge facing the outer side of the cover plate. After the pole is riveted, the connecting wall is pressed against the first insulating member on the circumferential inner side of the protrusion. The outer diameter of the connecting wall is D1, and the inner diameter of the protrusion is D2. 0.1mm≤(D2-D1) / 2≤0.52mm, where D1 and D2 are in mm.

2. The cover plate according to claim 1, characterized in that, The outer diameter of the protrusion is D3, 0.9mm≤(D3-D2) / 2≤2mm, where D3 is in mm.

3. The cover plate according to claim 1 or 2, characterized in that, The diameter of the column part is D4, and 16mm≤D4≤32mm.

4. The cover plate according to claim 3, characterized in that, 21mm≤D1≤37mm, 21.2mm≤D2≤37.2mm, 24.2mm≤D3≤40.2mm.

5. The cover plate according to claim 1 or 2, characterized in that, The cover plate body has a positioning protrusion on the side facing the second insulating member, and the second insulating member has a slot on the side facing the cover plate body that engages with the positioning protrusion.

6. The cover plate according to claim 5, characterized in that, The base plate has a flat section on its peripheral sidewall. The slot is located on the outer periphery of the base plate. The end of the second insulating member near the base plate has a limiting step that engages with the base plate. The bottom of the slot is located on the side of the base plate facing the outer side of the cover plate, close to the inner side of the cover plate.

7. The cover plate according to claim 1 or 2, characterized in that, A positioning groove is provided in the middle of the side surface of the column facing the outside of the cover plate.

8. The cover plate according to claim 1 or 2, characterized in that, The second insulating member has a mounting hole for the column portion to pass through, and a positioning post is provided on the side surface of the second insulating member facing the inside of the cover plate. The positioning post is located on the side of the mounting hole, and the connecting piece of the battery cell is adapted to be inserted and positioned on the positioning post.

9. A battery cell, characterized in that, The cover plate included in any one of claims 1 to 8.

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

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