Cover plate assembly and battery monomer

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery monomer. The embodiment of the utility model provides a cover plate assembly which comprises a cover plate, an electrode terminal, a bearing part and a flanging part, and the electrode terminal is arranged on the cover plate; the bearing part and the turnup part are arranged on the cover plate, the turnup part is closer to the leading-out end of the electrode terminal than the bearing part, and the bearing part and the turnup part are at least partially separated along the thickness direction of the cover plate so as to clamp the peripheral edge of the electrode terminal; wherein the flange part comprises at least two first flanges, every two adjacent first flanges are arranged at intervals in the circumferential direction of the electrode terminal to form a notch part, the bearing part comprises a plurality of first bearing sections, each first bearing section is arranged opposite to the corresponding notch part in the thickness direction of the cover plate, and each first bearing section is provided with a reinforcing part. The technical problem that the bearing strength of the cover plate to the electrode terminal is insufficient is solved, and the bearing capacity of the cover plate to the electrode terminal is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a cover plate assembly and a battery cell. BACKGROUND

[0002] In the related art, the cover plate assembly comprises a cover plate body and an electrode terminal. After the cover plate body and the electrode terminal are assembled, a recess is easily formed on the side of the cover plate body close to the battery cell, which causes the cover plate body to have insufficient bearing capacity for the electrode terminal. SUMMARY

[0003] The application provides a cover plate assembly and a battery cell, which solve the technical problem of insufficient bearing strength of the cover plate for the electrode terminal and improve the bearing capacity of the cover plate for the electrode terminal.

[0004] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the application comprises:

[0005] In a first aspect, the application provides a cover plate assembly, comprising a cover plate, an electrode terminal, a bearing portion and a flange portion, the electrode terminal is arranged on the cover plate, the bearing portion and the flange portion are arranged on the cover plate, the flange portion is closer to the lead-out end of the electrode terminal than the bearing portion, along the thickness direction of the cover plate, the bearing portion and the flange portion are at least partially spaced apart to sandwich the electrode terminal, wherein the flange portion comprises at least two first flanges, along the circumferential direction of the electrode terminal, the adjacent two first flanges are spaced apart to form a gap portion, the bearing portion comprises a plurality of first bearing segments, along the thickness direction of the cover plate, each first bearing segment is arranged opposite to the corresponding gap portion, and the first bearing segment is provided with a reinforcing portion.

[0006] The cover plate assembly provided in the application is arranged on the side of the cover plate away from the lead-out end of the electrode terminal along the thickness direction of the cover plate, and the flange portion is arranged on the side of the cover plate close to the lead-out end of the electrode terminal, the bearing portion and the flange portion are at least partially spaced apart, and the electrode terminal is sandwiched between the flange portion and the bearing portion to realize the positioning of the electrode terminal. The flange portion comprises at least two first flanges, the at least two first flanges are spaced apart along the circumferential direction of the electrode terminal, and each first flange is arranged opposite to the electrode terminal to sandwich the electrode terminal between the first flange and the bearing portion.

[0007] At least two first flanges are arranged at intervals to form a gap along the circumference of the electrode terminal, each first bearing segment is arranged opposite to the gap, and the first bearing segment is provided with a reinforcing portion. Along the thickness direction of the cover plate, at least one side of the electrode terminal away from the electrode terminal lead-out end abuts against the first bearing segment, and the other side of the electrode terminal close to the electrode terminal lead-out end abuts against the first flange. The first bearing segment is provided with a reinforcing portion, which can enhance the overall strength of the bearing portion, improve the bearing capacity of the bearing portion, improve the torsional resistance of the first bearing segment, reduce the deformation of the first bearing segment, and thus improve the sealing performance between the electrode terminal and the cover plate.

[0008] In a second aspect, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly, a tab, and the cover plate assembly described in any of the above embodiments. The shell has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly and the tab are arranged in the receiving cavity, and the tab is connected with the electrode assembly and the electrode terminal respectively. The cover plate assembly is connected with the shell to block the opening.

[0009] Along the thickness direction of the cover plate, the bearing portion is at least partially spaced apart from the flange portion, and each first flange is arranged opposite to the electrode terminal to position the first flange and the bearing portion relative to the electrode terminal. At least two first flanges are arranged at intervals to form a gap along the circumference of the electrode terminal, each first bearing segment is arranged opposite to the gap, and the first bearing segment is provided with a reinforcing portion. Along the thickness direction of the cover plate, at least one side of the electrode terminal away from the tab abuts against the first bearing segment, and the other side of the electrode terminal close to the tab abuts against the first flange. The first bearing segment is provided with a reinforcing portion, which can enhance the overall strength of the bearing portion, improve the bearing capacity of the bearing portion, improve the torsional resistance of the first bearing segment, reduce the deformation of the first bearing segment, and thus improve the sealing performance between the electrode terminal and the cover plate, and improve the performance of the battery monomer. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0011] Figure 1 FIG. 1 is a structural schematic diagram of a cover plate assembly of the present application;

[0012] Figure 2 FIG. 1 is a structural schematic diagram of a cover plate assembly of the present application;

[0013] Figure 3 FIG. 1 is a structural schematic diagram of a cover plate assembly of the present application; Figure 1a cross-sectional view in the D-D direction;

[0014] Figure 4 is Figure 1 a cross-sectional view in the E-E direction;

[0015] Figure 5 is a schematic view of a projection of the bearing portion and the through hole in the thickness direction of the cover plate.

[0016] [Legend of Reference Signs]

[0017] 1: cover plate; 10: through hole;

[0018] 2: electrode terminal; 21: outer peripheral edge; 211: first outer peripheral edge; 212: second outer peripheral edge;

[0019] 3: bearing portion; 31: first bearing section; 311: reinforcing portion; 3111: first end; 3112: second end; 32: second bearing section; 321: third end;

[0020] 4: flange portion; 41: first flange; 42: notch portion;

[0021] 5: seal;

[0022] A: thickness direction of the cover plate; B: first direction; C: second direction. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms “first”, “second” and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a specific order or primary and secondary relationship.

[0025] Reference to an“embodiment” in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that that the embodiments described in this application can be combined with each other in their various permutations and combinations.

[0026] In the description of the application, it should be noted that unless specifically defined and limited, the terms“mounting”,“connecting”,“connecting”,“attaching” should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0027] The term“and / or” in this application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” in this application generally represents that the front and rear associated objects have an“or” relationship.

[0028] “Multiple” appearing in this application refers to more than two (including two), and similarly, “multiple groups” refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).

[0029] In the related art, the cover plate assembly includes a cover plate body and an electrode terminal. After the cover plate body and the electrode terminal are assembled, a recess is easily formed on the side of the cover plate body close to the battery cell, resulting in insufficient bearing capacity of the cover plate body to the electrode terminal.

[0030] In view of this, with reference to Figures 1 to 3 , the application provides a cover plate 1 assembly, which includes a cover plate 1, an electrode terminal 2, a bearing part 3 and a flange part 4, the electrode terminal 2 is provided with the cover plate 1; the bearing part 3 and the flange part 4 are both provided on the cover plate 1, the flange part 4 is closer to the lead-out end of the electrode terminal 2 than the bearing part 3, along the thickness direction A of the cover plate 1, the bearing part 3 and the flange part 4 are at least partially spaced apart to clamp the electrode terminal 2; wherein the flange part 4 includes at least two first flanges 41, along the circumferential direction of the electrode terminal 2, the adjacent two first flanges 41 are spaced apart to form a gap part 42, along the thickness direction A of the cover plate 1, each first flange 41 is oppositely arranged with part of the outer circumferential surface 21 of the electrode terminal 2, the bearing part 3 includes a plurality of first bearing segments 31, along the thickness direction A of the cover plate 1, each first bearing segment 31 is oppositely arranged with a corresponding gap part 42, and the first bearing segment 31 is provided with a reinforcing part 311.

[0031] Specifically, along the thickness direction A of the cover plate 1, the bearing part 3 is arranged on the side of the cover plate 1 away from the lead-out end of the electrode terminal 2, the flanging part 4 is arranged on the side of the cover plate 1 close to the lead-out end of the electrode terminal, the bearing part 3 is at least partially spaced apart from the flanging part 4, and the electrode terminal 2 is clamped between the flanging part 4 and the bearing part 3 to achieve the limiting of the electrode terminal 2. The flanging part 4 includes at least two first flanges 41, which are arranged in a spaced apart manner along the circumference of the electrode terminal 2, and each of the first flanges 41 is arranged opposite to the electrode terminal 2 so that the electrode terminal 2 is clamped between the first flange 41 and the bearing part 3.

[0032] Along the circumference of the electrode terminal, the at least two first flanges 41 are arranged in a spaced apart manner to form a gap part 42, each first bearing segment 31 is arranged opposite to the gap part 42, and the first bearing segment 31 is provided with a reinforcing part 311. The first bearing segment 31 is arranged opposite to the gap part 42, that is, along the thickness direction A of the cover plate 1, the projection of the first bearing segment 31 does not coincide with the projection of the first flange 41, and the projection of the first flange 41 does not coincide with the projection of the reinforcing part 311. Along the thickness direction A of the cover plate 1, the side of the electrode terminal 2 away from the lead-out end of the electrode terminal abuts against at least the first bearing segment 31, and the side of the electrode terminal 2 close to the lead-out end of the electrode terminal abuts against the first flange 41. The first bearing segment 31 is provided with the reinforcing part 311, which can enhance the overall strength of the bearing part 3 and improve the bearing capacity of the bearing part 3 on the one hand, and can improve the torsional resistance of the first bearing segment 31 and reduce the deformation of the first bearing segment 31, thereby improving the sealing performance between the electrode terminal 2 and the cover plate 1.

[0033] After the electrode terminal 2 and the cover plate 1 are assembled, the cover plate 1 on the side close to the lead-out end of the electrode terminal needs to be rolled to form a first flange 41 that is pressed against the electrode terminal 2. The strength of the bearing part 3 needs to be high during the rolling process. The cover plate 1 on the side close to the battery cell has a material surplus, and the cover plate 1 on the side away from the lead-out end of the electrode terminal can be pressed and formed into a reinforcing part 311 to improve the overall strength of the cover plate 1 connected to the electrode terminal 2. Since the gap part 42 does not have the first flange 41 to fix the electrode terminal 2, the strength of the first bearing segment 31 needs to be strengthened to reduce the probability of sealing failure between the electrode terminal 2 and the cover plate 1 due to insufficient bearing capacity of the first bearing segment 31.

[0034] It should be understood that, along the thickness direction A of the cover plate 1, the cover plate 1 has a mounting hole for accommodating the electrode terminal 2, and the electrode terminal 2 can penetrate the mounting hole to connect with the battery cell through the tab; or part of the electrode terminal 2 is located in the mounting hole, and the tab of the battery cell extends into the mounting hole to connect with the electrode terminal 2. Among them, the lead-out end of the electrode terminal 2 is the side connected with the busbar.

[0035] The outer side wall of the electrode terminal 2 protrudes outward to form an outer periphery 21, the outer periphery 21 of the electrode terminal 2 is clamped between the first flange 41 and the bearing portion 3, along the thickness direction A of the cover plate 1, the outer periphery 21 of the electrode terminal 2 is at least in abutment with the first bearing section 31 away from the side of the electrode terminal lead-out end, and the outer periphery 21 of the electrode terminal 2 is in abutment with the first flange 41 close to the side of the electrode terminal lead-out end.

[0036] Optionally, with reference to Figure 1 and Figure 3 , the electrode terminal 2 includes two first outer peripheries 211 and two second outer peripheries 212, along a first direction B, the two first outer peripheries 211 are oppositely arranged, along a second direction C, the two second outer peripheries 212 are oppositely arranged, the size of the second outer periphery 212 in the first direction B is greater than the size of the first outer periphery 211 in the second direction C, the first direction B and the second direction C are perpendicular to each other along the thickness direction A of the cover plate 1; the first flange 41 is at least partially oppositely arranged with the corresponding first outer periphery 211, along the thickness direction A of the cover plate 1, the first bearing section 31 is at least partially oppositely arranged with the corresponding second outer periphery 212.

[0037] Along the thickness direction A of the cover plate 1, the first flange 41 is at least partially oppositely arranged with the corresponding first outer periphery 211, and the first flange 41 fixes and limits the first outer periphery 211 of the electrode terminal 2; along the thickness direction A of the cover plate 1, the first bearing section 31 is at least partially oppositely arranged with the corresponding second outer periphery 212, and the first bearing section 31 fixes and limits the second outer periphery 212 of the electrode terminal 2. Among them, the second outer periphery 212 is a long side section, and the first outer periphery 211 is a short side section. Because the size of the second outer periphery 212 in the first direction B is longer, the second outer periphery 212 has a larger disturbance when it is pressed, and the side of the second outer periphery 212 away from the battery cell corresponds to the notch portion 42 of the flange portion 4. The side of the second outer periphery 212 away from the battery cell is not provided with the first flange 41 for limiting the electrode terminal 2, so it is necessary to limit the electrode terminal 2, that is, along the thickness direction A of the cover plate 1, the first bearing section 31 is at least partially oppositely arranged with the corresponding second outer periphery 212, so as to enhance the connection between the electrode terminal 2 and the cover plate 1.

[0038] In one specific embodiment, the first flange 41 is two, each first flange 41 is at least partially oppositely arranged with the corresponding first outer periphery 211 along the thickness direction A of the cover plate 1, and the first bearing section 31 is two, each first bearing section 31 is at least partially oppositely arranged with the corresponding second outer periphery 212 along the thickness direction A of the cover plate 1.

[0039] Specifically, along the first direction B, the two first outer circumferential edges 211 are oppositely arranged, and the two first flanges 41 are oppositely arranged; along the second direction C, the two first bearing segments 31 are oppositely arranged. Along the thickness direction A of the cover plate 1, each first flange 41 is at least partially oppositely arranged with the corresponding first outer circumferential edge 211, and each first flange 41 fixes and limits the first outer circumferential edge 211 of the electrode terminal 2; along the thickness direction A of the cover plate 1, each first bearing segment 31 is at least partially oppositely arranged with the corresponding second outer circumferential edge 212, and each first bearing segment 31 fixes and limits the second outer circumferential edge 212 of the electrode terminal 2. Wherein, the second outer circumferential edge 212 is a long edge segment, and the first outer circumferential edge 211 is a short edge segment. Since the size of the second outer circumferential edge 212 in the first direction B is relatively large, the second outer circumferential edge 212 has a relatively large degree of disturbance when being pressed. In addition, the side of the second outer circumferential edge 212 away from the battery cell corresponds to the notch portion 42 of the flange portion 4, and the side of the second outer circumferential edge 212 away from the battery cell is not provided with the first flange 41 for limiting the electrode terminal 2. Therefore, it is necessary to limit the electrode terminal 2, that is, along the thickness direction A of the cover plate 1, each first bearing segment 31 is at least partially oppositely arranged with the corresponding second outer circumferential edge 212, so as to enhance the connection between the electrode terminal 2 and the cover plate 1.

[0040] It should be understood that each first flange 41 is at least partially oppositely arranged with the corresponding first outer circumferential edge 211, which can be that each first flange 41 is partially oppositely arranged with the corresponding first outer circumferential edge 211; or, a part of each first flange 41 is oppositely arranged with the first outer circumferential edge 211; or, along the thickness direction of the cover plate 1, the projection of each first flange 41 coincides with the corresponding first outer circumferential edge. Each first bearing segment 31 is at least partially oppositely arranged with the corresponding second outer circumferential edge 212, which can be that each first bearing segment 31 is partially oppositely arranged with the corresponding second outer circumferential edge 212; or, a part of each first bearing segment 31 is oppositely arranged with the corresponding second outer circumferential edge 212; or, along the thickness direction of the cover plate 1, the projection of each first bearing segment 31 coincides with the second outer circumferential edge 212.

[0041] Optionally, with reference to Figure 3 and Figure 4, the maximum size of the electrode terminal 2 along the first direction B is l, and the maximum size of the reinforcing portion 311 along the first direction B is L, and the following is satisfied: 0.1≤L / l≤0.7. Along the first direction B, the maximum size of the electrode terminal 2 is l, that is, along the first direction B, the maximum size of the second outer edge 212 is l, and the maximum size of the reinforcing portion 311 is L. Along the first direction B, the larger the size of the electrode terminal 2, the greater the disturbance of the second outer edge 212 when it is pressed, and the longer the length of the reinforcing portion 311 required. The ratio L / l of the maximum size L of the reinforcing portion 311 to the maximum size l of the electrode terminal 2 can be 0.13, 0.15, 0.16, 0.18, 0.2, 0.24, 0.26, 0.28, 0.3, 0.35, 0.4, 0.43, 0.45, 0.48, 0.5, 0.55, 0.58, 0.6, 0.64, 0.66, or 0.68.

[0042] Optionally, the maximum size L of the reinforcing portion 311 satisfies: 5mm≤L≤40mm, and the maximum size l of the electrode terminal 2 satisfies: 15mm≤l≤60mm. The maximum size L of the reinforcing portion 311 can be 6mm, 8mm, 10mm, 13mm, 15mm, 18mm, 20mm, 22mm, 25mm, 27mm, 30mm, 35mm, 38mm, or 39mm. The maximum size l of the electrode terminal can be 18mm, 20mm, 24mm, 27mm, 30mm, 33mm, 35mm, 38mm, 40mm, 42mm, 45mm, 47mm, 50mm, 53mm, 56mm, 58mm, or 59mm.

[0043] Optionally, with reference to Figure 1 , both of the second outer edges 212 are configured as straight lines, both of the first outer edges 211 include first arc-shaped segments, and along the first direction B, the two first outer edges 211 protrude in a direction away from each other. Both of the second outer edges 212 are configured as straight lines, both of the second outer edges 212 include first arc-shaped segments, and along the first direction B, the two first outer edges 211 protrude in a direction away from each other, so that the outer edge of the electrode terminal 2 is configured as a ring-shaped track. The length of the second outer edge 212 along the first direction B is longer, and the disturbance when it is pressed is greater, so the reinforcing portion 311 needs to be provided to fix and limit the second outer edge 212.

[0044] Optionally, with reference to Figure 1The bearing part 3 further comprises two second bearing segments 32, which are oppositely arranged along the first direction B, and comprise second arc-shaped segments, which protrude towards each other along the first direction B. The second bearing segments 32 are oppositely arranged with the corresponding first outer peripheral edges 211 along the thickness direction A of the cover plate 1. The bearing part 3 comprises two oppositely arranged second bearing segments 32 along the first direction B, and comprises two oppositely arranged first bearing segments 31 along the second direction C, which are connected between the two second bearing segments 32, so that the bearing part 3 is configured as a ring-shaped track. The first bearing segments 31 are long side segments of the ring-shaped track, and the second bearing segments 32 are short side segments of the ring-shaped track. The arc-shaped second bearing segments 32 are used to release stress and reduce the stress concentration between the second bearing segments 32 and the first bearing segments 31, which are caused by the electrode terminal 2. The first outer peripheral edges 211 are clamped between the corresponding first flanges 41 and the second bearing segments 32, and the second outer peripheral edges 212 are clamped between the notch parts 42 and the first bearing segments 31, so as to limit the electrode terminal 2.

[0045] If the first bearing segments 31 are arc-shaped, and the first outer peripheral edges 211 are clamped between the first flanges 41 and the second bearing segments 32 to strengthen the fixation of the electrode terminal 2, the length of the reinforcing part 311 can be reduced, that is, the ratio between the maximum size of the reinforcing part 311 and the maximum size of the electrode terminal 2 is reduced, under the condition that the size of the electrode terminal 2 is unchanged.

[0046] Optionally, referring to Figure 3 and Figure 4 , the maximum size of the reinforcing part 311 is L, and the maximum size of the electrode terminal 2 is l, and the following condition is satisfied: 0.2≤L / l≤0.7. The second bearing segments 32 are located on the short sides of the ring-shaped track, and the first outer peripheral edges 211 are clamped between the first flanges 41 and the second bearing segments 32. The second bearing segments 32 and the first flanges 41 bear a part of the stress caused by the pressure of the electrode terminal 2, so that the length of the reinforcing part 311 arranged on the first bearing segments 31 can be reduced, and the ratio between the maximum size of the reinforcing part 311 and the maximum size of the electrode terminal 2 is reduced.

[0047] The ratio L / l between the maximum size L of the reinforcing part 311 and the maximum size l of the electrode terminal 2 can be 0.22, 0.24, 0.26, 0.28, 0.3, 0.35, 0.4, 0.43, 0.45, 0.48, 0.5, 0.55, 0.58, 0.6, 0.64, 0.66 or 0.68.

[0048] Optionally, referring to Figure 4In the first direction B, the reinforcing portion 311 has a first end 3111 and a second end 3112, and the second bearing segment 32 has a third end 321 farthest from the electrode terminal 2, the distance between the first end 3111 and the adjacent third end 321 is X1, and the distance between the second end 3112 and the adjacent third end 321 is X2, satisfying: |X1-X2|≤3mm. In the first direction B, if the distance difference between the distance X1 between the first end 3111 and the adjacent third end 321 and the distance X2 between the second end 3112 and the adjacent third end 321 is too large, it indicates that the reinforcing portion 311 is offset, resulting in an asymmetric structure of the first bearing segment 31, that is, the long side structure of the annular track-shaped bearing portion 3 is asymmetric, one side has stronger structural strength, and the other side has weaker structural strength.

[0049] The difference between the distance X1 between the first end 3111 and the adjacent third end 321 and the distance X2 between the second end 3112 and the adjacent third end 321 can be 0.1mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2.1mm, 2.5mm, 2.7mm or 2.9mm.

[0050] Alternatively, the distance X1 between the first end 3111 and the adjacent third end 321 satisfies: 5mm≤X1≤15mm, and the distance X2 between the second end 3112 and the adjacent third end 321 satisfies: 5mm≤X2≤15mm. Wherein, the distance X1 between the first end 3111 and the adjacent third end 321 can be 5.4mm, 6mm, 7.5mm, 8mm, 9mm, 10mm, 10.8mm, 12mm, 13mm, 14mm, 14.5mm or 14.8mm. The distance X2 between the second end 3112 and the adjacent third end 321 can be 5.6mm, 6mm, 7.5mm, 8mm, 9mm, 10mm, 10.8mm, 12mm, 13mm, 14mm, 14.5mm or 14.8mm.

[0051] Alternatively, referring to Figure 4 The minimum distance between the first end 3111 and the adjacent second bearing segment 32 is equal to the minimum distance between the second end 3112 and the adjacent second bearing segment 32. That is, the reinforcing portion 311 is located in the middle of the first bearing segment 31, the distances between the two ends of the reinforcing portion 311 and the corresponding adjacent second bearing segment 32 are equal, the structural strength of the first bearing segment 31 is uniform, the first bearing segment 31 is uniformly structurally reinforced, and the existence of structural weak points is reduced.

[0052] Alternatively, referring to Figure 1Each first bearing segment 31 is provided with a reinforcing portion 311, and projections of two reinforcing portions 311 at least partially overlap along the second direction C. Each first bearing segment 31 is provided with a reinforcing portion 311 for structural reinforcement to bear the second outer circumferential wall 212. And projections of two reinforcing portions 311 at least partially overlap along the second direction C, so that the first bearing segment 31 can obtain relatively uniform structural reinforcement, and reduce the existence of structural weak points.

[0053] Optionally, referring to Figure 1 , Figure 3 and Figure 4 , the two reinforcing portions 311 are directly opposite along the second direction C; the maximum size of the reinforcing portion 311 along the first direction B is L, and the maximum size of the electrode terminal 2 is l, and 0.1≤L / l≤0.6 is satisfied. The projections of the two reinforcing portions 311 overlap along the second direction C, so that the first bearing segment 31 with a relatively long length can obtain uniform structural reinforcement, improve the bearing capacity of the electrode terminal 2, and reduce the existence of structural weak points. At this time, the maximum size of the reinforcing portion 311 along the first direction B can be reduced.

[0054] Wherein, the ratio L / l of the maximum size L of the reinforcing portion 311 to the maximum size l of the electrode terminal 2 can be 0.12, 0.15, 1.17, 0.19, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.35, 0.4, 0.43, 0.45, 0.48, 0.5, 0.55 or 0.58.

[0055] Optionally, referring to Figure 1 and Figure 5 , the bearing portion 3 is annular and surrounds the through hole 10, and the projection area of the through hole 10 along the thickness direction A of the cover plate 1 is s, and the projection area of the bearing portion 3 is S, and 0.25≤s / S≤0.9 is satisfied; the maximum size of the reinforcing portion 311 along the first direction B is L, and the maximum size of the electrode terminal 2 is l, and 0.1≤L / l≤0.58 is satisfied. The bearing portion 3 is annular and surrounds the through hole 10, and the electrode terminal 2 penetrates through the through hole 10, and when the projection area s of the through hole 10 along the thickness direction A of the cover plate 1 and the projection area S of the bearing portion 3 satisfy 0.25≤s / S≤0.9, the maximum size L of the reinforcing portion 311 along the first direction B and the maximum size l of the electrode terminal 2 satisfy 0.1≤L / l≤0.58. When the projection area s of the through hole 10 is large and the projection area S of the bearing portion 3 is small, in order to satisfy the structural reinforcement of the first bearing segment 31, it is necessary to increase the maximum size of the reinforcing portion 311.

[0056] The ratio s / S of the projected area s of the through hole 10 to the projected area S of the bearing portion 3 can be 0.27, 0.29, 0.3, 0.32, 0.33, 0.35, 0.38, 0.4, 0.43, 0.45, 0.46, 0.48, 0.5, 0.52, 0.53, 0.55, 0.58, 0.57, 0.6, 0.65, 0.7, 0.72, 0.76, 0.78, 0.8, 0.81, 0.85, 0.86, 0.88, or 0.89.

[0057] The ratio L / l of the maximum dimension L of the reinforcing portion 311 to the maximum dimension l of the electrode terminal 2 can be 0.12, 0.15, 0.17, 0.19, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.35, 0.4, 0.43, 0.45, 0.48, 0.5, 0.55, or 0.56.

[0058] Optionally, the projected area s of the through hole 10 satisfies: 200mm 2 ≤ s ≤ 600mm 2 , and the projected area S of the bearing portion 3 satisfies: 300mm 2 ≤ s ≤ 800mm 2 . The projected area s of the through hole 10 can be 210mm 2 , 230mm 2 , 260mm 2 , 280mm 2 , 300mm 2 , 330mm 2 , 350mm 2 , 380mm 2 , 400mm 2 , 420mm 2 , 440mm 2 , 460mm 2 , 490mm 2 , 510mm 2 , 540mm 2 , 550mm 2 , 560mm 2 , 575mm 2 , 580mm 2 , 588mm 2 , 592mm 2 , or 596mm 2 .

[0059] The projected area S of the bearing portion 3 can be 310mm 2 , 330mm 2 , 350mm 2 , 380mm2 400mm 2 420mm 2 440mm 2 460mm 2 490mm 2 510mm 2 540mm 2 550mm 2 560mm 2 575mm 2 580mm 2 588mm 2 592mm 2 600mm 2 620mm 2 630mm 2 650mm 2 680mm 2 720mm 2 740mm 2 750mm 2 760mm 2 780mm 2 785mm 2 790mm 2 or 795mm 2 .

[0060] Optionally, with reference to Figure 4 , along the thickness direction A of the cover plate 1, the minimum thickness of the first bearing section 31 is H, and along the first direction B, the maximum size of the reinforcing portion 311 is L, and the following is satisfied: 0.0125≤H / L≤0.3. The smaller the thickness H of the first bearing section 31, the larger the size L of the reinforcing portion 311 that is needed. However, since the reinforcing portion 311 is extruded from part of the material of the first bearing section 31, if the thickness H of the first bearing section 31 is small, a long reinforcing portion 311 cannot be extruded, thereby reducing the structural reinforcement effect of the electrode terminal 2, and therefore the following is satisfied: 0.0125≤H / L≤0.3. The ratio H / L of the minimum thickness H of the first bearing section 31 to the maximum size L of the reinforcing portion 311 can be 0.0128, 0.013, 0.015, 0.018, 0.02, 0.023, 0.025, 0.026, 0.0275, 0.028, 0.029, 0.0295, or 0.0298.

[0061] Optionally, the minimum thickness H of the first bearing segment 31 satisfies: 0.5mm≤H≤1.5mm. The minimum thickness H of the first bearing segment 31 can be: 0.55mm, 0.58mm, 0.6mm, 0.7mm, 0.8mm, 0.85mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.45mm.

[0062] Optionally, referring to Figure 3 , the cover plate 1 assembly further comprises a sealing member 5, which is arranged at least between the bearing part 3 and the outer peripheral edge 21 of the electrode terminal 2 along the thickness direction A of the cover plate 1. The sealing member 5 is arranged at least between the bearing part 3 and the outer peripheral edge 21 of the electrode terminal 2 along the thickness direction A of the cover plate 1 to seal and insulate between the bearing part 3 and the electrode terminal 2. In a specific embodiment, the sealing member 5 is arranged between the bearing part 3 and the outer peripheral edge 21 of the electrode terminal 2, between the inner wall of the cover plate 1 facing the through hole 10 and between the first flange 41 and the electrode terminal 2.

[0063] The material of the sealing member 5 can be silicone strips, liquid foam, ethylene propylene diene rubber (EPDM), polypropylene (PP) and polyethylene terephthalate (PET), etc. The cover plate 1 and the electrode terminal 2 are pressed against each other, so that the sealing member 5 is elastically deformed, thereby realizing the sealing between the electrode terminal 2 and the cover plate 1.

[0064] It should be noted that the elastic force generated by the sealing member 5 after being pressed will be applied to the electrode terminal 2, and the first flange 41 can be opposite to the outer peripheral edge of the electrode terminal 2 in the thickness direction of the cover plate 1, thereby limiting the electrode terminal 2.

[0065] Optionally, referring to Figure 1 and Figure 4 The reinforcing part 311 is configured as a protruding part protruding from the side of the first bearing segment 31 away from the first flange 41. The reinforcing part 311 protrudes towards the direction of the battery cell, reducing the situation that the adhesion between the electrode terminal 2 and the cover plate 1 is uneven and has gaps due to the reinforcing part 311 protruding towards the first flange 41, thereby affecting the sealing; at the same time, the difficulty of molding and the manufacturing cost are reduced due to the need to correspondingly set a recess on the electrode terminal 2 because the reinforcing part 311 protrudes towards the first flange 41.

[0066] Optionally, referring to Figure 3 and Figure 4In the thickness direction A of the cover plate 1, the maximum dimension F of the reinforcing portion 311 protruding away from the lead-out end of the electrode terminal 2, and the compression amount f of the sealing member 5 satisfy: 0.18≤F / f≤0.56. The maximum dimension F of the reinforcing portion 311 protruding away from the lead-out end of the electrode terminal 2 is the maximum dimension F of the reinforcing portion 311 protruding away from the battery cell. The compression amount f of the sealing member 5 is the thickness of the sealing member 5 after being compressed. The reinforcing portion 311 enhances the strength of the first bearing section 31 to resist the rebound force of the sealing member 5, and reduces the bending phenomenon of the first bearing section 31 caused by stress. The greater the compression amount f of the sealing member 5, the greater the rebound force, and the greater the thickness of the reinforcing portion 311 required.

[0067] The ratio F / f between the maximum dimension F of the reinforcing portion 311 protruding away from the lead-out end of the electrode terminal and the compression amount f of the sealing member 5 can be 0.185, 0.19, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.35, 0.4, 0.43, 0.45, 0.48, 0.5, 0.55, or 0.558.

[0068] Optionally, the maximum dimension F of the reinforcing portion 311 protruding away from the lead-out end of the electrode terminal satisfies: 0.1mm≤F≤0.5mm, and the compression amount f of the sealing member 5 satisfies: 0.3mm≤f≤0.9mm.

[0069] The maximum dimension F of the reinforcing portion 311 protruding away from the lead-out end of the electrode terminal can be 0.12mm, 0.14mm, 0.15mm, 0.17mm, 0.18mm, 0.185mm, 0.19mm, 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.35mm, 0.4mm, 0.43mm, 0.45mm, 0.48mm, or 0.49mm.

[0070] The compression amount f of the sealing member 5 can be 0.35mm, 0.4mm, 0.43mm, 0.45mm, 0.48mm, 0.49mm, 0.52mm, 0.56mm, 0.58mm, 0.6mm, 0.65mm, 0.7mm, 0.73mm, 0.75mm, 0.79mm, 0.8mm, 0.81mm, 0.84mm, 0.86mm, 0.88mm, or 0.89mm.

[0071] Optionally, with reference to Figure 3 and Figure 4, the maximum dimension of the reinforcing portion 311 along the thickness direction A of the cover plate 1 is F, the maximum dimension of the reinforcing portion 311 along the first direction B is L, and 0.5≤F*L≤20 is satisfied. The greater the thickness of the reinforcing portion 311 is, the more beneficial it is to enhance the structural strength of the first bearing section 31, and the longer the length of the reinforcing portion 311 is, the more beneficial it is to enhance the structural strength of the first bearing section 31. However, the reinforcing portion 311 is formed by extrusion of the material of the first bearing section 31, and because the material of the first bearing section 31 is limited, the greater the thickness of the reinforcing portion 311 after forming is, the smaller the length of the reinforcing portion 311 that can be formed is. Therefore, the length and the thickness of the reinforcing portion 311 need to be balanced, and 0.5≤F*L≤20 needs to be satisfied.

[0072] The product F*L of the maximum dimension F of the reinforcing portion 311 and the maximum dimension L of the reinforcing portion 311 can be 1, 2, 3, 4, 5, 6, 7, 8, 8.8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 19.5.

[0073] Optionally, each reinforcing portion 311 is configured as a reinforcing rib extending along the first direction B. The reinforcing portion 311 is configured as a continuous reinforcing rib extending along the first direction B, which is better formed.

[0074] Optionally, with reference to Figure 4 The reinforcing portion 311 has a first end 3111 along the first direction B, and the second bearing section 32 has a third end 321 farthest from the electrode terminal 2, and the distance between the first end 3111 and the adjacent third end 321 is X1, and 5mm≤X1≤15mm is satisfied. If the distance between the reinforcing portion 311 and the adjacent third end 321 is too far along the first direction B, the force of the first flange 41 on the electrode terminal 2 can be quickly transmitted to the first bearing section 31, and the first bearing section 31 is at greater risk of deformation; if the distance between the reinforcing portion 311 and the adjacent third end 321 is too close, the reinforcing portion 311 has a sealing failure problem at the connection between the first bearing section 31 and the second bearing section 32, and the electrode terminal 2, the bearing portion 3, and the seal 5 are not firmly attached.

[0075] The distance X1 between the first end 3111 and the adjacent third end 321 can be 5.4mm, 5.8mm, 6mm, 7mm, 8mm, 8.5mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 14.5mm, or 14.8mm.

[0076] Optionally, each reinforcing portion 311 comprises a plurality of sub-reinforcing ribs (not shown in the figure), which are arranged at intervals along the first direction B and each extends along the first direction B. The plurality of sub-reinforcing ribs arranged at intervals along the first direction B can be dispersed in more areas of the first bearing segment 31, which means that the reinforcing area of the first bearing segment 31 is longer, thereby making the structural strength of the first bearing segment 31 higher.

[0077] The application also provides a battery monomer, which comprises a shell, an electrode assembly, a tab, and the cover plate 1 assembly described in any of the above embodiments. The shell has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly and the tab are arranged in the receiving cavity, and the tab is connected with the electrode assembly and the electrode terminal respectively. The cover plate assembly is connected with the shell to block the opening. The battery monomer provided in the embodiments of the application has the reinforcing portion 311 arranged on the bearing portion 3 of the cover plate 1 assembly, which can structurally reinforce the first bearing segment 31 and improve the structural strength of the cover plate 1.

[0078] Along the thickness direction of the cover plate 1, the bearing portion 3 is arranged on the side of the cover plate 1 close to the electrode assembly, the flange portion 4 is arranged on the side of the cover plate 1 away from the electrode assembly, and the bearing portion 3 and the flange portion 4 are at least partially spaced apart. Each first flange 41 is arranged opposite to the electrode terminal 2 to realize the positioning of the first flange 41 and the bearing portion 3 on the electrode terminal 2. Along the circumferential direction of the electrode terminal 2, at least two first flanges 41 are arranged at intervals to form a gap portion 42. Each first bearing segment 31 is arranged opposite to the gap portion 42, and the first bearing segment 31 is provided with the reinforcing portion 311. Along the thickness direction of the cover plate 1, the side of the electrode terminal 2 connected with the tab at least abuts against the first bearing segment 31, and the side of the electrode terminal 2 away from the tab abuts against the first flange 41. The first bearing segment 31 is provided with the reinforcing portion 311, which can enhance the overall strength of the bearing portion 3, improve the bearing capacity of the bearing portion 3, improve the torsional resistance of the first bearing segment 31, and reduce the deformation of the first bearing segment 31, thereby achieving the purposes of improving the sealing performance between the electrode terminal 2 and the cover plate 1 and improving the performance of the battery monomer.

[0079] The electrode terminal 2 in the application is a racetrack type, which has a long side segment and a short side segment. The electrode terminal 2 in the application is a rolled edge fixed type electrode terminal 2. Specifically, the two first outer circumferential edges 211 of the electrode terminal 2 are short side segments, and the two second outer circumferential edges 212 are long side segments. The first flange 41 and the second bearing segment 32 are arranged corresponding to the first outer circumferential edge 211, and the first outer circumferential edge 211 is clamped between the first flange 41 and the second bearing segment 32. The first bearing segment 31 is arranged opposite to the second outer circumferential edge 212, and the first bearing segment 31 is provided with the reinforcing portion 311 protruding towards the electrode core. The reinforcing portion 311 can enhance the structural strength of the first bearing segment 31 and improve the reliability of the connection and sealing between the cover plate 1 and the electrode terminal 2.

[0080] It should also be noted that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. In the context of the specification, the term "and / or" means "and" or "or", and the term "or" means "and" or "or". In the context of the specification, the term "exemplary" means "example" or "an example of".

[0081] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0082] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

[0083] Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized by The utility model relates to a cover plate, electrode terminal, bearing part and turn -up part, the bearing part and the turn -up part are all arranged to the cover plate, the turn -up part is closer to the electrode terminal's lead -out end compared with the bearing part, along the thickness direction of the cover plate, the bearing part and the turn -up part are at least partially spaced apart to sandwich the electrode terminal, wherein the turn -up part includes at least two first turn -ups, along the circumference of the electrode terminal, two adjacent first turn -ups are spaced apart to form a gap part, along the thickness direction of the cover plate, each first turn -up is opposite to the part of the outer circumference of the electrode terminal, the bearing part includes a plurality of first bearing segments, along the thickness direction of the cover plate, each first bearing segment is opposite to the corresponding gap part, and the first bearing segment is provided with a reinforcing part. The electrode terminal includes two first outer circumferences and two second outer circumferences, two first outer circumferences are opposite along a first direction, two second outer circumferences are opposite along a second direction, the size of the second outer circumference in the first direction is greater than the size of the first outer circumference in the second direction, and the first direction, the second direction and the thickness direction of the cover plate are perpendicular to each other. Along the thickness direction of the cover plate, the first turn -up is at least partially opposite to the corresponding first outer circumference, and along the thickness direction of the cover plate, the first bearing segment is at least partially opposite to the corresponding second outer circumference. The maximum size of the reinforcing part is L, and the maximum size of the electrode terminal is l along the first direction, and 0.1<=L / l<=0.7 is satisfied. The maximum size L of the reinforcing part satisfies 5mm<=L<=40mm, and the maximum size l of the electrode terminal satisfies 15mm<=l<=60mm.

2. The cover plate assembly of claim 1, wherein, Both the second outer circumferences are configured as straight lines, both the first outer circumferences include first arc segments, and both the first outer circumferences protrude in a direction away from each other along the first direction. The bearing part further includes two second bearing segments, both the second bearing segments are opposite along the first direction, both the second bearing segments include second arc segments, and both the second bearing segments protrude in a direction away from each other along the first direction; and along the thickness direction of the cover plate, the second bearing segment is opposite to the corresponding first outer circumference.

3. The cover plate assembly of claim 2, wherein, The maximum size of the reinforcing part is L, and the maximum size of the electrode terminal is l along the first direction, and 0.2<=L / l<=0.7 is satisfied.

4. The cover plate assembly of claim 3, wherein, The reinforcing part has a first end and a second end along the first direction, the second bearing segment has a third end farthest away from the electrode terminal, the distance between the first end and the adjacent third end is X1, the distance between the second end and the adjacent third end is X2, and |X1-X2|<=3mm is satisfied.

5. The cover plate assembly of claim 2, wherein, The distance X1 between the first end and the adjacent third end satisfies 5mm<=X1<=15mm, and the distance X2 between the second end and the adjacent third end satisfies 5mm<=X2<=15mm.

6. The cover plate assembly of claim 5, wherein, ​ 7. The cover plate assembly of claim 6, wherein, ​ 8. The cover plate assembly of claim 6, wherein, ​ 9. The cover plate assembly of claim 8, wherein, ​ 10. The cover plate assembly of claim 8, wherein, The minimum distance between the first end and the adjacent second bearing section is equal to the minimum distance between the second end and the adjacent second bearing section.

11. The cover plate assembly of claim 6, wherein, Each of the first bearing sections is provided with a reinforcing portion, and projections of two of the reinforcing portions at least partially overlap in the second direction.

12. The cover plate assembly of claim 11, wherein, The two reinforcing portions face each other in the second direction. In the first direction, the maximum dimension of the reinforcing portion is L, and the maximum dimension of the electrode terminal is l, satisfying 0.1≤L / l≤0.

6.

13. The cover plate assembly of claim 3, wherein, The bearing portion is configured in a ring shape and encloses a through hole, and a projected area of the through hole in the thickness direction of the cover plate is s, and a projected area of the bearing portion is S, satisfying 0.25≤s / S≤0.

9. In the first direction, the maximum dimension of the reinforcing portion is L, and the maximum dimension of the electrode terminal is l, satisfying 0.1≤L / l≤0.

58.

14. The cover plate assembly of claim 13, wherein, The projection area s of the through hole satisfies: 200mm 2 ≤ s ≤ 600mm 2 The projection area S of the bearing portion satisfies: 300mm 2 ≤ s ≤ 800mm 2 .

15. The cover plate assembly of claim 1, wherein, In the thickness direction of the cover plate, the minimum thickness of the first bearing section is H, and in the first direction, the maximum dimension of the reinforcing portion is L, satisfying 0.0125≤H / L≤0.

3.

16. The cover plate assembly of claim 15, wherein, The minimum thickness H of the first bearing section satisfies 0.5mm≤H≤1.5mm.

17. The cover plate assembly of claim 1, wherein, The cover plate assembly further comprises a sealing member, which is arranged at least between the bearing portion and the outer periphery of the electrode terminal in the thickness direction of the cover plate.

18. The cover plate assembly of claim 17, wherein, The reinforcing portion is configured as a protruding portion protruding from the side surface of the first bearing section away from the first flange.

19. The cover plate assembly of claim 18, wherein, In the thickness direction of the cover plate, the maximum dimension of the reinforcing portion protruding toward the lead-out end of the electrode terminal is F, and the compression amount of the sealing member is f, satisfying 0.18≤F / f≤0.

56.

20. The cover plate assembly of claim 19, wherein, The maximum dimension F of the reinforcing portion protruding toward the lead-out end of the electrode terminal satisfies 0.1mm≤F≤0.5mm, and the compression amount f of the sealing member satisfies 0.3mm≤f≤0.9mm.

21. The cover plate assembly of claim 19, wherein, In the thickness direction of the cover plate, the maximum dimension of the reinforcing portion is F, and in the first direction, the maximum dimension of the reinforcing portion is L, satisfying 0.5≤F*L≤20.

22. The cover plate assembly of claim 6, wherein, Each of the reinforcing portions is configured as a reinforcing rib extending in the first direction.

23. The cover plate assembly of claim 22, wherein, In the first direction, the first end of the reinforcing portion and the third end of the second bearing section most distal to the electrode terminal have a distance X1 therebetween, satisfying 5mm≤X1≤15mm.

24. The cover plate assembly of claim 1, wherein, Each of the reinforcing portions comprises a plurality of sub-reinforcing ribs arranged at intervals in the first direction, and each of the sub-reinforcing ribs extends in the first direction.

25. A battery cell, characterized by Comprising: a housing having a receiving cavity and an opening communicating with the receiving cavity; an electrode assembly and a tab, the electrode assembly and the tab being arranged in the receiving cavity, and the tab being connected with the electrode assembly and the electrode terminal, respectively; the cover plate assembly of any one of claims 1 to 24, the cover plate assembly being connected with the housing to seal the opening.

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