Pole piece, battery cell and battery

Abstract

The utility model provides a pole piece, battery cell and battery, the pole piece of the embodiment of the utility model comprises a body, tabs and first gummed paper, the body is provided with a first groove arranged on one side of the body, part of tabs is arranged in the first groove, the first gummed paper is arranged in the first groove, and the first gummed paper covers the part of tabs in the first groove. The first gummed paper comprises a first hot melt adhesive layer, the first hot melt adhesive layer is suitable for thermal deformation so as to fill a gap formed between the first groove and the tab, and the pole piece disclosed by the embodiment of the utility model has the characteristic that the safety of the battery cell and the energy density of the battery cell can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a pole piece and the electric core with it. BACKGROUND

[0002] With the requirement of user to lithium ion battery charging time is higher and higher, the lithium ion battery with high charging rate characteristic embedded middle lug structure has gradually replaced the conventional lug structure, the embedded lug needs to set the empty foil area slot position for welding lug on the pole piece, after completing the lug welding, usually pastes a layer of insulating adhesive tape on the surface of the lug and the empty foil area slot position area, plays the role of insulation protection.

[0003] The insulating adhesive tape in the related art needs to cover the active material on the edge of the slot position when pasting, so as to ensure effective insulation, but the area of the adhesive tape overlapping with the active material will increase the thickness of the pole piece, and then increase the thickness of the electric core and reduce the energy density of the electric core. SUMMARY

[0004] To solve the technical problem of reducing the energy density of the electric core by the pole piece in the related art, the utility model provides a pole piece.

[0005] The utility model embodiment pole piece includes

[0006] The body has the first recess groove on one side of the body,

[0007] The lug is partially arranged in the first recess groove,

[0008] The first adhesive tape is arranged in the first recess groove, and the first adhesive tape covers the part of the lug located in the first recess groove.

[0009] The first adhesive tape includes a first hot melt adhesive layer, and the first hot melt adhesive layer is suitable for being deformed by heat or pressure to fill the gap formed between the first recess groove and the lug.

[0010] The pole piece of the utility model embodiment sets the first adhesive tape including the first hot melt adhesive layer in the first recess groove for connecting the lug, so that the first hot melt adhesive layer fills the gap formed between the first recess groove and the lug in the hot pressing formation process after the pole piece is processed to form the electric core. On the one hand, the first adhesive tape can fully cover the first recess groove, thereby avoiding the exposure of the current collector in the first recess groove and improving the safety performance of the electric core. On the other hand, the first adhesive tape will not increase the thickness of the pole piece, and thus will not increase the thickness of the electric core and reduce the energy density of the electric core.

[0011] In some embodiments, the body further has a second recess groove corresponding to the first recess groove arranged on the other side of the body,

[0012] The pole piece further comprises a second adhesive paper, the second adhesive paper is arranged in the second groove, and the second adhesive paper comprises a second hot melt adhesive layer.

[0013] The first hot melt adhesive layer is a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer.

[0014] The second hot melt adhesive layer is a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer.

[0015] In some embodiments, the first adhesive paper fills a gap between the first groove and the tab, and a top surface of the first hot melt adhesive layer is flush with a top surface of the first groove.

[0016] The second adhesive paper fills the second groove, and a top surface of the second hot melt adhesive layer is flush with a top surface of the second groove.

[0017] In some embodiments, a volume of the tab arranged in the first groove is V1, a volume of the first adhesive paper is V2, a volume of the first groove is V3, and V3=V1+V2.

[0018] In some embodiments, a volume of the second adhesive paper is V4, a volume of the second groove is V5, and V5=V4.

[0019] In some embodiments, the body comprises a current collector and first and second active material layers respectively coated on two sides of the current collector.

[0020] The first groove is arranged in the first active material layer, and the second groove is arranged in the second active material layer.

[0021] In some embodiments, the first adhesive paper further comprises a first adhesive layer and a first substrate layer, the first substrate layer is arranged between the first adhesive layer and the first hot melt adhesive layer, and an outer edge of the first adhesive layer is connected to the current collector to cover the tab.

[0022] The first hot melt adhesive layer covers the first substrate layer and fills a gap between the first substrate layer, the first adhesive layer, the tab and the first groove.

[0023] In some embodiments, the second adhesive paper further comprises a second adhesive layer and a second substrate layer, the second substrate layer is arranged between the second adhesive layer and the second hot melt adhesive layer, the second adhesive layer is connected to the current collector, the second hot melt adhesive layer covers the second substrate layer and fills a gap between the second substrate layer and the second adhesive layer and the second groove.

[0024] The utility model further provides a kind of electric core.

[0025] The electrode piece is used for the electrode core of the battery.

[0026] The utility model discloses a battery.

[0027] The battery is used for the battery. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model clearer, the utility model will be further described in detail in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and not to limit the utility model.

[0029] Figure 1 It is the structural schematic diagram before the first adhesive paper of the utility model electrode piece is heated and deformed.

[0030] Figure 2 It is the sectional view before the first adhesive paper of the utility model electrode piece is heated and deformed.

[0031] Figure 3 It is the structural schematic diagram after the first adhesive paper of the utility model electrode piece is heated and deformed.

[0032] Figure 4 It is the sectional view after the first adhesive paper of the utility model electrode piece is heated and deformed.

[0033] In the drawing:

[0034] 1, the body;101, the first recess;102, the second recess;103, the current collector;104, the first active material layer;105, the second active material layer.

[0035] 2, the tab;

[0036] 3, the first adhesive paper;301, the first hot melt adhesive layer;302, the first base material layer;303, the first adhesive layer;

[0037] 4, the second adhesive paper;401, the second hot melt adhesive layer;402, the second base material layer;403, the second adhesive layer. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model clearer, the utility model will be further described in detail in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and not to limit the utility model.

[0039] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "a plurality of" is two or more than two, unless otherwise specified.

[0040] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, the meaning of "a plurality of" is two or more than two, unless otherwise specified.

[0041] The utility model discloses a pole piece. Figures 1-4 The utility model discloses a pole piece.

[0042] The utility model discloses a pole piece including body 1, pole ear 2 and first adhesive paper 3.

[0043] As Figures 1-4 As shown in the drawing, body 1 has first recess 101 arranged at one side of body 1, that is to say, body 1 has two sides opposite in its thickness direction, and one side of body 1 is provided with first recess 101.

[0044] It can be understood that the body 1 of the pole piece usually includes a current collector 103 and an active material layer coated on both sides of the current collector 103 in the thickness direction, and the first recess 101 is not provided with the active material layer.

[0045] Part of pole ear 2 is arranged in first recess 101, that is to say, a part of pole ear 2 is arranged in first recess 101 and connected with the current collector 103 corresponding to first recess 101.

[0046] First adhesive paper 3 is arranged in first recess 101, and first adhesive paper 3 covers the part of pole ear 2 located in first recess 101.

[0047] Among them, first adhesive paper 3 includes first hot melt adhesive layer 301, and first hot melt adhesive layer 301 is suitable for being deformed by heat or pressure to fill the gap formed between first recess 101 and pole ear 2.

[0048] The first adhesive paper 3 is arranged in the first groove 101 for connecting the tab 2, so that the first adhesive layer is filled in the gap between the first groove 101 and the tab 2 in the hot-pressing formation process after the electrode sheet is processed to form the battery cell, on the one hand, the first adhesive paper 3 can fully cover the first groove 101, thereby avoiding the current collector 103 in the first groove 101 from being exposed, and improving the safety performance of the battery cell; on the other hand, the first adhesive paper 3 does not increase the thickness of the electrode sheet, thereby also not increasing the thickness of the battery cell and reducing the energy density of the battery cell.

[0049] Therefore, the electrode sheet has the characteristics of improving the safety performance of the battery cell and the energy density of the battery cell.

[0050] In some embodiments, the body 1 also has a second groove 102 corresponding to the first groove 101 arranged on the other side of the body 1,

[0051] That is, the body 1 has two opposite sides in the thickness direction thereof, one side of the body 1 is provided with the first groove 101, and the other side of the body 1 is provided with the second groove 102.

[0052] It can be understood that the body 1 of the electrode sheet usually includes the current collector 103 and the active material layer coated on both sides of the current collector 103 in the thickness direction, and the second groove 102 is also not provided with the active material layer.

[0053] The second adhesive paper 4 is arranged in the second groove 102, and the second adhesive paper 4 includes a second hot-melt adhesive layer 401, and the second hot-melt adhesive layer 401 is suitable for being deformed by heat or pressure to fill the second groove 102;

[0054] The first hot-melt adhesive layer 301 is a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer;

[0055] When the first hot-melt adhesive layer 301 is a heat-sensitive adhesive layer, the first hot-melt adhesive layer 301 is filled in the gap between the first groove 101 and the tab 2 by heat in the hot-pressing formation process after the electrode sheet is processed to form the battery cell;

[0056] When the first hot-melt adhesive layer 301 is a pressure-sensitive adhesive layer, the first hot-melt adhesive layer 301 is filled in the gap between the first groove 101 and the tab 2 by pressure in the hot-pressing formation process after the electrode sheet is processed to form the battery cell.

[0057] The second hot-melt adhesive layer 401 is a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer;

[0058] When the second hot-melt adhesive layer 301 is a heat-sensitive adhesive layer, the second hot-melt adhesive layer 301 is filled in the gap between the second groove 101 and the tab 2 by heat in the hot-pressing formation process after the electrode sheet is processed to form the battery cell;

[0059] When the second hot melt adhesive layer 301 is a pressure-sensitive adhesive layer, in the hot-pressing formation process of the pole piece after the battery cell is processed, the second hot melt adhesive layer 301 is filled in the gap formed between the second groove 102 and the tab 2 under pressure.

[0060] The pole piece of the embodiment of the utility model discloses a second adhesive paper 4 including a second hot melt adhesive layer is arranged in the second groove 102 for connecting the tab 2, so that in the hot-pressing formation process of the pole piece after the battery cell is processed, the second hot melt adhesive layer is filled in the second groove 102 under heat or pressure, on the one hand, the second adhesive paper 4 can fully cover the second groove 102, thereby the current collector 103 in the second groove 102 can be avoided to be exposed, and the safety performance of the battery cell is improved, on the other hand, the second adhesive paper 4 will not increase the thickness of the pole piece, thereby the thickness of the battery cell and the energy density of the battery cell can also be avoided to be reduced.

[0061] In some embodiments, the first adhesive paper 3 fills the gap formed between the first groove 101 and the tab 2, and the top surface of the first hot melt adhesive layer 301 is flush with the top surface of the first groove 101.

[0062] The top surface of the first hot melt adhesive layer 301 is the side surface of the first hot melt adhesive layer 301 away from the current collector 103.

[0063] The second adhesive paper 4 fills the second groove 102, and the top surface of the second hot melt adhesive layer 401 is flush with the top surface of the second groove 102.

[0064] The top surface of the second hot melt adhesive layer 401 is the side surface of the second hot melt adhesive layer 401 away from the current collector 103.

[0065] The pole piece of the embodiment of the utility model discloses that the top surface of the first hot melt adhesive layer 301 is flush with the top surface of the first groove 101 and the top surface of the second hot melt adhesive layer 401 is flush with the top surface of the second groove 102, which can avoid increasing the thickness of the pole piece, and thereby the thickness of the battery cell and the energy density of the battery cell can also be avoided to be reduced.

[0066] In some embodiments, the volume of the tab 2 arranged in the first groove 101 is V1, the volume of the first adhesive paper 3 is V2, the volume of the first groove 101 is V3, and V3=V1+V2.

[0067] The pole piece of the embodiment of the utility model discloses that V3=V1+V2, which can make the top surface of the first hot melt adhesive layer 301 flush with the top surface of the first groove 101, can avoid increasing the thickness of the pole piece, and thereby the thickness of the battery cell and the energy density of the battery cell can also be avoided to be reduced.

[0068] In some embodiments, the volume of the second adhesive paper 4 is V4, the volume of the second groove 102 is V5, and V5=V4.

[0069] The second thermal adhesive layer 401 is flush with the top surface of the second groove 102 by setting V3=V5=V4, so that the thickness of the pole piece and the thickness of the battery cell can be avoided from increasing, and the energy density of the battery cell can be avoided from reducing.

[0070] In some embodiments, the body 1 comprises a current collector 103 and a first active material layer 104 and a second active material layer 105 coated on both sides of the current collector 103; the first groove 101 is arranged on the first active material layer 104, and the second groove 102 is arranged on the second active material layer 105.

[0071] It can be understood that the first groove 101 can be formed by intermittent coating or laser etching the first active material layer 104, and the second groove 102 can be formed by intermittent coating or laser etching the second active material layer 105.

[0072] In some embodiments, as shown in Figure 4 The first adhesive paper 3 further comprises a first adhesive layer 303 and a first substrate layer 302, the first substrate layer 302 is arranged between the first adhesive layer 303 and the first thermal adhesive layer 301, the outer edge of the first adhesive layer 303 is connected with the current collector 103 to cover the tab 2; the first thermal adhesive layer 301 covers the first substrate layer 302 and fills the gap between the first substrate layer 302, the first adhesive layer 303, the tab 2 and the first groove 101.

[0073] In some embodiments, as shown in Figure 4 The second adhesive paper 4 further comprises a second adhesive layer 403 and a second substrate layer 402, the second substrate layer 402 is arranged between the second adhesive layer 403 and the second thermal adhesive layer 401, the second adhesive layer 403 is connected with the current collector 103, the second thermal adhesive layer 401 covers the second substrate layer 402 and fills the gap between the second substrate layer 402 and the second adhesive layer 403 and the second groove 102.

[0074] The utility model provides a kind of battery cell.

[0075] The battery cell of the embodiment of the utility model comprises the pole piece described in the above embodiment.

[0076] The battery cell of the embodiment of the utility model by setting the pole piece described in the above embodiment, the safety and energy density of battery cell can be improved.

[0077] The utility model provides a kind of battery.

[0078] The battery of the embodiment of the utility model comprises the battery cell described in the above embodiment.

[0079] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A pole piece, characterized in that, The application relates to a battery tab (2) and a battery tab (2) manufacturing method. The application comprises: a body (1) having a first groove (101) on one side of the body (1); a tab (2) partially arranged in the first groove (101), a first adhesive paper (3) arranged in the first groove (101), and covering the part of the tab (2) in the first groove (101); 2. The pole piece of claim 1, wherein the first adhesive paper (3) comprises a first hot-melt adhesive layer (301) which is adapted to be deformed by heat or pressure to fill the gap between the first groove (101) and the tab (2). the body (1) further has a second groove (102) on the other side of the body (1) corresponding to the first groove (101), the application further comprises a second adhesive paper (4) arranged in the second groove (102), and the second adhesive paper (4) comprises a second hot-melt adhesive layer (401) which is adapted to be deformed by heat or pressure to fill the second groove (102); the first hot-melt adhesive layer (301) is a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer; 3. The pole piece of claim 2, wherein the second hot-melt adhesive layer (401) is a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer. the first adhesive paper (3) fills the gap between the first groove (101) and the tab (2), and the top surface of the first hot-melt adhesive layer (301) is flush with the top surface of the first groove (101); 4. The pole piece of claim 1, wherein the second adhesive paper (4) fills the second groove (102), and the top surface of the second hot-melt adhesive layer (401) is flush with the top surface of the second groove (102).

5. The pole piece of claim 2, wherein the volume of the tab (2) arranged in the first groove (101) is V1, the volume of the first adhesive paper (3) is V2, and the volume of the first groove (101) is V3, V3=V1+V2.

6. The pole piece of claim 2, wherein the volume of the second adhesive paper (4) is V4, and the volume of the second groove (102) is V5, V5=V4. the body (1) comprises a current collector (103) and first and second active material layers (104, 105) respectively coated on both sides of the current collector (103); 7. The pole piece of claim 6, wherein the first groove (101) is arranged in the first active material layer (104), and the second groove (102) is arranged in the second active material layer (105). the first adhesive paper (3) further comprises a first adhesive layer (303) and a first substrate layer (302), the first substrate layer (302) is arranged between the first adhesive layer (303) and the first hot-melt adhesive layer (301), and the outer edge of the first adhesive layer (303) is connected to the current collector (103) to cover the tab (2); the first hot-melt adhesive layer (301) covers the first substrate layer (302) and fills the gap between the first substrate layer (302), the first adhesive layer (303), the tab (2) and the first groove (101).

8. The pole piece of claim 6, wherein The second adhesive paper (4) further comprises a second adhesive layer (403) and a second substrate layer (402), the second substrate layer (402) is arranged between the second adhesive layer (403) and the second hot melt adhesive layer (401), The second adhesive layer (403) is connected with the current collector (103), The second hot melt adhesive layer (401) covers the second substrate layer (402) and fills the gap between the second substrate layer (402), the second adhesive layer (403) and the second groove (102).

9. An electric cell characterized by The pole piece comprises the pole piece according to any one of claims 1-8.

10. A battery, characterized by The battery cell comprises the battery cell according to claim 9.

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