Cover plate assembly, battery cell and battery

Abstract

The utility model provides a cover plate assembly, a battery cell and a battery, and relates to the technical field of batteries. The cover plate assembly comprises a cover plate and an insulating layer; the cover plate has a first surface configured to face the electrode assembly; the insulating layer is arranged on the first surface; the insulating part is arranged on one side, deviating from the cover plate, of the insulating layer; wherein the edge line X of the insulating layer is located on the inner side of the outer edge line Z of the cover plate, and a distance exists between the edge line X and the outer edge line Z. According to the scheme, on one hand, the insulativity of the surface of the cavity wall, used for forming the battery cell, of the inner cavity of the cover plate can be improved, and therefore electric contact between a conductive part in the battery cell and the cover plate can be effectively avoided. And on the other hand, the unfavorable conditions of agglomeration or explosion welding and the like of the edge of the insulating layer due to the influence of welding heat when the cover plate and the shell are welded can be avoided, so that the welding quality of the cover plate and the shell and the insulation protection property of the insulating layer can be ensured. Therefore, the insulation protection performance of the insulation cover plate can be improved.

Description

TECHNICAL FIELD

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

[0002] The battery cell comprises a shell, an electrode assembly and a cover plate assembly. The electrode assembly is arranged in the shell, and the cover plate assembly comprises a cover plate covering the shell, a pole post penetrating the cover plate and connected with the electrode assembly, and an insulating piece insulating and separating the cover plate from the electrode assembly.

[0003] In the related art, although the insulating piece can achieve insulation and protection between the cover plate and the electrode assembly, the insulation and protection performance is poor, thereby adversely affecting the reliability of the battery cell. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a cover plate assembly, a battery cell and a battery, which can improve the insulation and protection performance between the cover plate assembly and the electrode assembly.

[0005] In a first aspect, embodiments of the present application provide a cover plate assembly, comprising a cover plate and an insulating layer; the cover plate has a first surface configured to face an electrode assembly; the insulating layer is arranged on the first surface; and an insulating piece is arranged on a side of the insulating layer away from the cover plate; wherein an edge line X of the insulating layer is located inside an outer edge line Z of the cover plate, and a distance is provided between the edge line X and the outer edge line Z.

[0006] In an embodiment, a distance A is provided between the edge line X and the outer edge line Z, and the distance A satisfies: 0.5mm≤A≤2mm.

[0007] In an embodiment, the edge line X and the outer edge line Z are equidistantly arranged.

[0008] In an embodiment, a thickness D of the insulating layer satisfies: 50μm≤D≤300μm.

[0009] In an embodiment, the cover plate assembly further comprises an insulating piece arranged on the side of the insulating layer away from the cover plate; wherein the edge line X is located between an outer edge line Y of the insulating piece and the outer edge line Z.

[0010] In an embodiment, the cover plate assembly further comprises a pole post mounted on the cover plate, and the pole post is configured to be directly connected with a tab; wherein a height dimension H of the insulating piece satisfies: 2mm≤H≤5mm.

[0011] In an embodiment, the insulating piece comprises a first ring, an end surface of one end of the first ring is connected with the insulating layer, and an outer edge line of the first ring is the outer edge line Y of the insulating piece.

[0012] In an embodiment, the distance between the inner circumferential surface of the first ring and the outer circumferential surface of the first ring is B, and 0.1mm≤B≤2.0mm is satisfied; or, the cover plate assembly is applied to a square shell battery cell, the first ring is a rectangular ring having a long side and a wide side, and on the wide side of the first ring, the distance between the inner circumferential surface of the first ring and the outer circumferential surface of the first ring is B, and 0.1mm≤B≤2.0mm is satisfied.

[0013] In an embodiment, the cover plate assembly further comprises a pole, the pole is arranged through the cover plate; the insulating piece further comprises a second ring, the second ring is arranged in the first ring and connected with the first ring; the second ring is sleeved on one end of the pole; wherein, the outer circumferential surface of the pole is provided with a flange, and the flange is overlapped with one side of the second ring away from the cover plate.

[0014] In an embodiment, the cover plate is provided with a liquid injection hole, and the insulating piece further comprises a shunt blocking piece, the shunt blocking piece is arranged in the first ring and connected with the first ring; the shunt blocking piece is arranged opposite to the liquid injection hole, and the edge of the shunt blocking piece is provided with a liquid discharge hole.

[0015] In an embodiment, the shunt blocking piece comprises a third ring, a connecting arm and a blocking plate connected in sequence, the third ring is connected with the first ring, the blocking plate is located on one side of the third ring away from the cover plate and arranged opposite to the liquid injection hole, and the connecting arm has a plurality of connecting arms, the plurality of connecting arms are arranged in a circumferential direction of the liquid injection hole, and the distance between adjacent two connecting arms is the liquid discharge hole.

[0016] In an embodiment, the cover plate assembly further comprises an explosion-proof valve, the explosion-proof valve is mounted on the cover plate, and the insulating piece further comprises a support frame, the support frame is arranged in the first ring and connected with the first ring; the support frame is arranged opposite to the air inlet of the explosion-proof valve; the support frame is provided with a relief groove and an exhaust through hole connected in communication, and the relief groove is located on one side of the support frame facing the explosion-proof valve.

[0017] In an embodiment, the insulating piece further comprises a positioning piece; the positioning piece is arranged in the first ring and connected with the support frame; the positioning piece is arranged opposite to the end of the explosion-proof valve; one side of the positioning piece facing the explosion-proof valve is provided with a positioning groove, and the positioning groove is attached to the end of the explosion-proof valve.

[0018] In a second aspect, the embodiments of the present application provide an electric cell, which comprises a shell, an electrode assembly and the aforementioned cover plate assembly; the electrode assembly is arranged in the shell; the cover plate is covered with the shell, and one end of the insulating piece away from the cover plate is in abutment with the electrode assembly.

[0019] In a third aspect, the embodiments of the present application provide a battery, which comprises the aforementioned electric cell, and the electric cell has a plurality of electric cells connected in series and / or in parallel.

[0020] The beneficial effects of the embodiments of the present application are as follows:

[0021] In the embodiments of this application, by setting the edge line X to be located inside the outer edge line Z, and by having a distance between the edge line X and the outer edge line Z, on the one hand, the insulation of the surface of the inner cavity wall of the cover plate used to form the battery cell can be improved, thereby effectively preventing electrical contact between the conductive components inside the battery cell and the cover plate. On the other hand, it can prevent the edge of the insulation layer from agglomerating or bursting due to welding heat during the welding of the cover plate and the shell, thereby ensuring the welding quality of the cover plate and the shell and the insulation protection of the insulation layer. Thus, the insulation protection of the insulating cover plate can be improved. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application;

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 This is a partial structural schematic diagram of the cover plate assembly provided in an embodiment of this application;

[0026] Figure 4 This is a partial structural schematic diagram of another part of the cover plate assembly provided in an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the structure of the insulating component provided in an embodiment of this application;

[0028] Figure 6 A cross-sectional view of the cover plate assembly provided in the embodiments of this application;

[0029] Figure 7 yes Figure 5 Enlarged view of point B in the middle;

[0030] Figure 8 This is a schematic diagram of the insulation component provided in an embodiment of this application from another perspective;

[0031] Figure 9 The embodiments of this application provide schematic diagrams of the battery cell structure;

[0032] Figure 10 The embodiments of this application provide a schematic diagram of the battery cell structure.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-Cover plate assembly; 11-Cover plate; 111-First surface; 112-Outer edge line Z;

[0035] 12 - Insulation layer; 121 - Edge line X;

[0036] 13-Insulating component; 131-First ring; 132-Second ring; 133-Outer edge line Y; 134-Flow divider; 1341-Drain hole; 1342-Third ring; 1343-Connecting arm; 1344-Baffle; 135-Support frame; 1351-Allowing groove; 1352-Exhaust through hole; 136-Positioning component; 1361-Positioning groove;

[0037] 14-Pole post; 141-Flange;

[0038] 15 - Sealing ring;

[0039] 2-Battery cell; 21-Housing shell; 22-Injection port; 23-Explosion-proof valve;

[0040] 3-Battery; 31-Box body; 32-Box cover. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0044] Please see Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of a cover plate assembly 1 provided by an embodiment of the present application, Figure 2 is Figure 1 An embodiment of the present application provides a cover plate assembly 1. The cover plate assembly 1 comprises a cover plate 11 and an insulation layer 12. The cover plate 11 has a first surface 111 configured to face an electrode assembly. The insulation layer 12 is arranged on the first surface 111. Wherein, an edge line X121 of the insulation layer 12 is located inside an outer edge line Z112 of the cover plate 11, and a distance is provided between the edge line X121 and the outer edge line Z112.

[0045] Specifically, the insulation layer 12 can be formed on the cover plate 11 by spraying, or can be formed on the cover plate 11 by plating.

[0046] It can be understood that when the cover plate assembly 1 is applied to the battery cell 2, one end of the insulation piece 13 away from the cover plate 11 abuts against the electrode assembly, so as to prevent the electrode assembly from shaking relative to the shell of the battery cell 2. The battery cell 2 can be a cylindrical battery cell 2, or a square shell battery cell 2.

[0047] It can be understood that the material of the insulation layer 12 is not limited in the present application, which is any insulation material that does not react with the electrolyte and can withstand the working temperature of the battery cell 2, for example, perfluoroalkoxy alkoxy (PFA), ceramic material, ultraviolet curing glue, etc. The ceramic material includes but is not limited to nano ceramic graphene composite material, alumina titanium ceramic material, alumina ceramic material, zirconia ceramic material, chromium oxide ceramic material.

[0048] In the present embodiment, by arranging the edge line X121 inside the outer edge line Z112 and providing a distance between the edge line X121 and the outer edge line Z112, on the one hand, the insulation property of the cover plate 11 for forming the surface of the inner cavity wall of the battery cell 2 can be improved, so that the conductive components inside the battery cell 2 can be effectively prevented from electrically contacting the cover plate 11; on the other hand, the edge of the insulation layer 12 can be prevented from gathering or welding explosion and other adverse conditions due to the influence of welding heat when the cover plate 11 and the shell 21 are welded, so that the welding quality of the cover plate 11 and the shell 21 and the insulation protection property of the insulation layer 12 can be ensured. In this way, the insulation protection property of the insulation cover plate 11 can be improved.

[0049] In addition, by improving the insulation property of the cover plate 11 for forming the surface of the inner cavity wall of the battery cell 2, the cover plate 11 can also be effectively prevented from being corroded by the electrode liquid.

[0050] Please refer to Figure 3 , Figure 3 is a partial structural schematic diagram of a cover plate assembly 1 provided by an embodiment of the present application. In an embodiment, a distance A is provided between the edge line X121 and the outer edge line Z112, and satisfies: 0.5mm≤A≤2mm.

[0051] It is understood that the spacing A between the edge line X121 and the outer edge line Z112 includes, but is not limited to, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 1.8mm, and 2mm.

[0052] In this embodiment, by limiting the distance A between the edge line X121 and the outer edge line Z112, on the one hand, it can avoid the adverse situation of the edge of the insulating layer 12 agglomerating or bursting due to welding heat during the welding of the cover plate 11 and the housing 21 due to the small distance A, thereby ensuring the welding quality of the cover plate 11 and the housing 21 and the insulation protection of the insulating layer 12; on the other hand, it can avoid the insulating layer 12 insufficiently covering the part of the first surface 111 located inside the cell 2 due to the large distance A, thereby effectively ensuring the insulation protection between the cover plate 11 and the internal components of the cell 2. In this way, the reliability of the cell 2 can be improved.

[0053] Please refer to the following: Figure 2 In one embodiment, the edge line X121 and the outer edge line Z112 are equidistant. This effectively improves the consistency of insulation protection at the edge of the cover plate 11, thereby enhancing the reliability of the battery cell 2.

[0054] It is understandable that setting the outer edge line Z112 and the edge line X121 at equal intervals can make the distance between any two points between the outer edge line Z112 and the edge line X121 equal or approximately equal.

[0055] Please see Figure 4 , Figure 4 This is a partial structural schematic diagram of another part of the cover plate assembly 1 provided in an embodiment of this application. In one embodiment, the thickness D of the insulating layer 12 is: 50μm≤D≤300μm.

[0056] It is understood that the thickness D of the insulating layer 12 includes, but is not limited to, 50μm, 56μm, 62μm, 68μm, 74μm, 80μm, 86μm, 92μm, 98μm, 104μm, 110μm, 116μm, 122μm, 128μm, 134μm, 140μm, 146μm, 152μm, 158μm, 164μm, 170μm, etc. μm, 176μm, 182μm, 188μm, 194μm, 200μm, 206μm, 212μm, 218μm, 224μm, 230μm, 236μm m, 242μm, 248μm, 254μm, 260μm, 266μm, 272μm, 278μm, 284μm, 290μm, 296μm, 300μm.

[0057] In the embodiment, by limiting the thickness D of the insulation layer 12, on the one hand, the insulation layer 12 can avoid being too small in thickness D, so as to effectively ensure the reliability of the insulation between the cover plate 11 and the electrode assembly; on the other hand, the insulation layer 12 can avoid being too large in thickness D, so as to improve the utilization rate of the internal space of the battery cell 2, and control the material cost of the insulation layer 12.

[0058] Referring to Figure 1 and Figure 4 In an embodiment, the cover plate assembly 1 further comprises an insulation piece 13. The insulation piece 13 is arranged on the side of the insulation layer 12 away from the cover plate 11. Wherein, the edge line X121 is located between the outer edge line Y133 of the insulation piece 13 and the outer edge line Z112.

[0059] Specifically, the insulation piece 13 can be cemented with the first surface 111 and / or the insulation layer 12, or can be heat-fused connected with the first surface 111 and / or the insulation layer 12.

[0060] It can be understood that when the cover plate assembly 1 is applied to the battery cell 2, the outer edge of the insulation piece 13 faces the inner wall of the shell 21 of the battery cell 2.

[0061] In the embodiment, by setting the edge line X121 between the outer edge line Y133 and the outer edge line Z112, the coverage of the insulation layer 12 to the surface of the cover plate 11 towards the inside of the battery cell can be improved, so that the insulation of the surface of the cover plate 11 used to form the inner cavity wall of the battery cell 2 can be improved, so as to effectively avoid the electrically conductive components inside the battery cell 2 from being in electrical contact with the cover plate 11. In this way, the insulation protection of the insulation cover plate 11 can be improved.

[0062] Referring to Figure 1 and Figure 4 In an embodiment, the cover plate assembly 1 further comprises a pole 14. The pole 14 is mounted on the cover plate 11. The pole 14 is configured to be directly connected with the tab. Wherein, the height dimension H of the insulation piece 13 satisfies: 2mm≤H≤5mm.

[0063] It can be understood that the cover plate 11 is provided with a mounting through hole, and the pole 14 is arranged in the through hole.

[0064] Correspondingly, the cover plate assembly 1 further comprises a sealing ring 15. The sealing ring 15 seals the fitting part between the cover plate 11 and the pole 14, so as to avoid leakage of the electrolyte from the fitting part therebetween.

[0065] It can be understood that the height dimension H of the insulating piece 13 includes but is not limited to 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3.0 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm.

[0066] It can be understood that in the related art, an adapter is arranged between the pole 14 and the tab, and the tab is connected with the pole 14 through the adapter. In the embodiment, by directly connecting the pole 14 with the tab, the arrangement in the related art can be omitted, so that the height dimension of the electrode assembly can be increased, so that the end surface of the electrode assembly is closer to the end cover, and thus the height dimension H of the insulating piece 13 can be reduced. In this way, the space utilization inside the battery cell 2 can be improved, and the energy density of the battery cell 2 can be improved.

[0067] Specifically, the tab is connected with the inner wall of the tab connecting groove on the side of the pole 14 facing the electrode assembly.

[0068] Please refer to Figure 5 , Figure 5 is a structural schematic diagram of the insulating piece 13 provided by the embodiment of the present application. In an embodiment, the insulating piece 13 includes a first ring 131. The end surface of one end of the first ring 131 is connected with the insulating layer 12. The outer edge line of the first ring 131 is the outer edge line Y133 of the insulating piece 13.

[0069] It can be understood that the end of the first ring 131 away from the cover plate 11 abuts against the electrode assembly, so as to prevent the electrode assembly from shaking relative to the shell of the battery cell 2.

[0070] Since the first surface 111 of the cover plate 11 is provided with the tab insulating layer 12, the demand of the battery cell 2 on the insulating piece 13 to insulate and separate the electrode assembly and the cover plate 11 is reduced. Based on this, in the embodiment, by arranging the insulating piece 13 as the first ring 131, the material amount of the first insulating piece 13 can be reduced, so that the weight of the cover plate assembly 1 can be reduced, so as to facilitate the lightweight design of the battery cell 2. At the same time, by arranging the insulating piece 13 as the first ring 131, the embodiment can provide more arrangement space for the tab, so that the difficulty of arranging the tab with more layers can be reduced, so as to improve the production efficiency.

[0071] Please refer to Figure 3 In an embodiment, the spacing between the inner circumferential surface of the first ring 131 and the outer circumferential surface of the first ring 131 is B, which satisfies: 0.1 mm≤B≤2.0 mm.

[0072] In the embodiment, through the above definition, on the one hand, the minimum value of the distance between the inner circumferential surface of the first ring 131 and the outer circumferential surface of the first ring 131 can be ensured to ensure the strength of the first ring 131, so that the reliability of the abutment of the first ring 131 with the electrode assembly can be improved; on the other hand, the distance between the inner circumferential surface of the first ring 131 and the outer circumferential surface of the first ring 131 is not too large to affect the arrangement of the tab, so that more tabs can be arranged to improve the utilization rate of the internal space of the battery cell 2.

[0073] In another embodiment, the cover plate assembly 1 is applied to a square battery cell 2, and the first ring 131 is a rectangular ring with a long side and a wide side. On the wide side of the first ring 131, the distance between the inner circumferential surface of the first ring 131 and the outer circumferential surface of the first ring 131 is B, which satisfies: 0.1mm≤B≤2.0mm.

[0074] In the embodiment, through the above definition, on the one hand, the minimum value of the distance between the inner circumferential surface of the first ring 131 and the outer circumferential surface of the first ring 131 can be ensured to ensure the strength of the first ring 131, so that the reliability of the abutment of the first ring 131 with the electrode assembly can be improved; on the other hand, the distance between the inner circumferential surface of the first ring 131 and the outer circumferential surface of the first ring 131 is not too large to affect the arrangement of the tab, so that more tabs can be arranged to improve the utilization rate of the internal space of the battery cell 2.

[0075] Please refer to Figure 5 and Figure 6 , Figure 6 The embodiment of the application provides a sectional view of the cover plate assembly 1. In an embodiment, the cover plate assembly 1 further comprises a pole 14. The pole 14 is provided through the cover plate 11. The insulating piece 13 further comprises a second ring 132. The second ring 132 is arranged in the first ring 131 and connected with the first ring 131. The second ring 132 is sleeved on one end of the pole 14. The outer circumferential surface of the pole 14 is provided with a flange 141. The flange 141 is overlapped with the side of the second ring 132 away from the cover plate 11. In this way, the stability of the insulating piece 13 on the side of the cover plate 11 can be improved by overlapping the flange 141 of the pole 14 with the second ring 132, so that the stability of the structure of the cover plate assembly 1 can be improved.

[0076] It can be understood that the pole 14 has two, which are a positive pole 14 and a negative pole 14. Correspondingly, the second ring 132 has two, which are arranged correspondingly with the two poles 14.

[0077] Please refer to Figure 1 and Figure 7 , Figure 7 Figure 5The enlarged view of the middle B. In an embodiment, the cover plate 11 is provided with a liquid injection hole 22. The insulation piece 13 further comprises a flow distribution baffle 134. The flow distribution baffle 134 is arranged in the first ring 131 and connected with the first ring 131. The flow distribution baffle 134 is arranged opposite to the liquid injection hole 22. The edge of the flow distribution baffle 134 is provided with a liquid discharge hole 1341. In this way, when the liquid injection process is performed, after the electrolyte flows through the liquid injection hole 22, it will first flow to the flow distribution baffle 134 to alleviate the impact force of the electrolyte flow by the flow distribution baffle 134; and then, the electrolyte will flow into the inside of the battery cell 2 through the liquid discharge hole 1341 of the edge of the flow distribution baffle 134, so that the electrolyte will not directly impact the components inside the battery cell 2, to alleviate the impact force of the electrolyte injected into the battery cell 2, and avoid damage to the components inside the battery cell 2. In this way, the yield of the finished battery cell 2 can be effectively improved.

[0078] The flow distribution baffle 134 is connected with the first ring 131 through the second ring 132. Specifically, the flow distribution baffle 134 is connected with the outer circumferential surface of the second ring 132.

[0079] Please refer to Figure 7 In an embodiment, the flow distribution baffle 134 comprises a third ring 1342, a connecting arm 1343 and a baffle plate 1344 connected in sequence. The third ring 1342 is connected with the first ring 131. The baffle plate 1344 is located on the side of the third ring 1342 away from the cover plate 11 and is arranged opposite to the liquid injection hole 22. The connecting arm 1343 has a plurality of connecting arms. The plurality of connecting arms 1343 are arranged in a circumferential direction of the liquid injection hole 22. The spacing between the adjacent two connecting arms 1343 is the liquid discharge hole 1341. In this way, the spacing between the baffle plate 1344 and the liquid injection hole 22 can be increased, so that the injected electrolyte can be buffered through the spacing, to reduce the impact force received by the baffle plate 1344, so that the stress state of the flow distribution baffle 134 can be improved.

[0080] The flow distribution baffle 134 is connected with the first ring 131 through the second ring 132. Specifically, the flow distribution baffle 134 is connected with the outer circumferential surface of the second ring 132.

[0081] Please refer to Figure 5 and Figure 8 , Figure 8 is another view of the structure of the insulation piece 13 provided by the embodiment of the present application. In an embodiment, the cover plate assembly 1 further comprises an explosion-proof valve 23. The explosion-proof valve 23 is installed on the cover plate 11. The insulation piece 13 further comprises a support frame 135. The support frame 135 is arranged in the first ring 131 and connected with the first ring 131. The support frame 135 is arranged opposite to the air inlet of the explosion-proof valve 23. The support frame 135 is provided with a relief groove 1351 and an exhaust hole 1352 connected in communication. The relief groove 1351 is located on the side of the support frame 135 facing the explosion-proof valve 23.

[0082] It can be understood that the avoidance groove 1351 can avoid the insulation piece 13 interfering with the explosion-proof valve 23.

[0083] In the embodiment, by arranging the support frame 135, the diaphragm and the pole piece and other components can avoid blocking the inlet of the explosion-proof valve 23, so that when the explosion-proof valve 23 is opened, the gas in the battery cell 2 can be smoothly discharged through the explosion-proof valve. In this way, the probability of the battery cell 2 running out of control or even exploding can be reduced.

[0084] Please refer to Figure 7 and Figure 8 In an embodiment, the insulation piece 13 further comprises a positioning piece 136. The positioning piece 136 is arranged in the first ring 131 and connected with the support frame 135. The positioning piece 136 is arranged opposite to the end of the explosion-proof valve 23. The side of the positioning piece 136 facing the explosion-proof valve 23 is provided with a positioning groove 1361. The positioning groove 1361 is in close contact with the end of the explosion-proof valve 23. In this way, the installation of the insulation piece 13 to the explosion-proof valve 23 can be positioned, so that the operability of the insulation piece 13 installed to one side of the cover plate 11 and the accuracy of the installation position can be improved.

[0085] Among them, the positioning piece 136 has two, respectively located on both sides of the support frame 135. The two positioning pieces 136 are matched with the two ends of the explosion-proof valve 23 respectively. The positioning piece 136 adjacent to the shunt blocking piece 134 is also connected with the shunt blocking piece 134, specifically, the positioning piece 136 is connected with the third ring 1342.

[0086] Please refer to Figure 9 , Figure 9 The embodiment of the application provides a structural schematic diagram of the battery cell 2. Accordingly, the embodiment of the application also provides a battery cell 2. The battery cell 2 comprises a shell 21, an electrode assembly and the aforementioned cover plate assembly 1. The electrode assembly is arranged in the shell 21. The cover plate 11 is covered with the shell 21. The end of the insulation piece 13 away from the cover plate 11 abuts against the electrode assembly.

[0087] In the embodiment, by adopting the cover plate assembly 1 provided by some embodiments of the application, the insulation of the cover plate 11 for forming the surface of the inner cavity wall of the battery cell 2 can be improved, so that the conductive components in the battery cell 2 can be effectively prevented from being in electrical contact with the cover plate 11. In this way, the reliability of the battery cell 2 can be improved.

[0088] Please refer to Figure 10 , Figure 10 The embodiment of the application provides a structural schematic diagram of the battery cell 2. The embodiment of the application provides a battery 3. The battery 3 comprises the aforementioned battery cell 2. There are a plurality of battery cells 2. The plurality of battery cells 2 are connected in series and / or in parallel.

[0089] It can be understood that the plurality of battery cells 2 can be connected in series, connected in parallel, or connected in series in one part and connected in parallel in another part.

[0090] It can be understood that the battery 3 can further include a box body 31 and a box cover 32 covering the box body 31. The battery cell 2 is arranged in the box body 31.

[0091] In the embodiment, by using the battery cell 2 provided by some embodiments of the present application, the insulation of the cover plate 11 used to form the surface of the inner cavity wall of the battery cell 2 can be improved, so that the electrically conductive components inside the battery cell 2 can be effectively prevented from being in electrical contact with the cover plate 11. In this way, the reliability of the battery 3 can be improved.

[0092] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the above description of the content of the specification should not be understood as a limitation of the present application.

Claims

1. A cover plate assembly, characterized by The cover plate has a first surface configured to face the electrode assembly; and an insulation layer arranged on the first surface; wherein an edge line X of the insulation layer is located inside an outer edge line Z of the cover plate, and a distance is provided between the edge line X and the outer edge line Z. The distance A between the edge line X and the outer edge line Z satisfies: 0.5mm≤A≤2mm. The edge line X is equidistantly arranged with the outer edge line Z. The thickness D of the insulation layer satisfies: 50μm≤D≤300μm.

2. The cover plate assembly of claim 1, wherein, The cover plate assembly further comprises an insulation piece arranged on a side of the insulation layer away from the cover plate; wherein the edge line X is located between an outer edge line Y of the insulation piece and the outer edge line Z.

3. The cover plate assembly of claim 1, wherein, The cover plate assembly further comprises a pole column mounted on the cover plate, and the pole column is configured to be directly connected with a tab; wherein a height dimension H of the insulation piece satisfies: 2mm≤H≤5mm.

4. The cover plate assembly of claim 1, wherein, The insulation piece comprises a first ring, an end surface of one end of the first ring is connected with the insulation layer, and an outer edge line of the first ring is the outer edge line Y of the insulation piece.

5. The cover plate assembly of any one of claims 1-4, wherein, A distance between an inner circumferential surface of the first ring and an outer circumferential surface of the first ring satisfies: 0.1mm≤B≤2.0mm. Alternatively, the cover plate assembly is applied to a square shell battery cell, the first ring is a rectangular ring with a long side and a short side, and a distance between the inner circumferential surface of the first ring and the outer circumferential surface of the first ring on the short side of the first ring satisfies: 0.1mm≤B≤2.0mm.

6. The cover plate assembly of claim 5, wherein, The cover plate assembly further comprises a pole column arranged on the cover plate, and the insulation piece further comprises a second ring arranged in the first ring and connected with the first ring, and the second ring is sleeved on one end of the pole column; wherein an outer circumferential surface of the pole column is provided with a flange, and the flange is overlapped with a side of the second ring away from the cover plate. The cover plate is provided with a liquid injection hole, the insulation piece further comprises a shunt blocking piece arranged in the first ring and connected with the first ring, the shunt blocking piece is arranged opposite to the liquid injection hole, and an edge of the shunt blocking piece is provided with a liquid discharge hole.

7. The cover plate assembly of claim 5, wherein, The shunt blocking piece comprises a third ring, a connecting arm and a blocking plate connected in sequence, the third ring is connected with the first ring, the blocking plate is located on a side of the third ring away from the cover plate and arranged opposite to the liquid injection hole, and the connecting arm has a plurality of connecting arms arranged at intervals along a circumferential direction of the liquid injection hole, and a distance between adjacent two connecting arms is the liquid discharge hole.

8. The cover plate assembly of claim 7, wherein, The cover plate assembly further comprises an explosion-proof valve mounted on the cover plate, the insulation piece further comprises a support frame arranged in the first ring and connected with the first ring, the support frame is arranged opposite to an air inlet of the explosion-proof valve, and the support frame is provided with a relief groove and an exhaust through hole connected in sequence, and the relief groove is located on a side of the support frame facing the explosion-proof valve. ​ 9. The cover plate assembly of claim 7, wherein, ​ ​ 10. The cover plate assembly of claim 7, wherein, ​ 11. The cover plate assembly of claim 10, wherein, ​ 12. The cover plate assembly of claim 7, wherein, ​ 13. The cover plate assembly of claim 12, wherein, The insulating piece further comprises a positioning piece; the positioning piece is arranged in the first ring and connected with the support frame; the positioning piece is arranged opposite to the end of the explosion-proof valve; one side of the positioning piece towards the explosion-proof valve is provided with a positioning groove, and the positioning groove is attached to the end of the explosion-proof valve.

14. An electric cell, characterized by Comprising: a housing; an electrode assembly arranged in the housing; and the cover plate assembly of any one of claims 1-13, the cover plate is covered with the housing, and the insulating piece of the cover plate assembly is away from the end of the cover plate and abuts against the electrode assembly.

15. A battery, characterized by The battery cell of claim 14 is included, and a plurality of the battery cells are connected in series and / or in parallel.

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