Coating device and battery

Abstract

The utility model provides a coating device and a battery. Wherein the coating device comprises a coating die head and a plurality of coating pipelines, the coating die head is provided with a plurality of coating channels, coating outlets and coating inlets, the coating outlets and the coating inlets are communicated with the coating channels, and the coating outlets are used for coating the same or different coatings; the coating pipeline comprises a feeding pipe, one end of the feeding pipe is connected with the coating inlet, and a coating valve is arranged on the feeding pipe. According to the embodiment of the utility model, the coating die head comprising the plurality of coating channels and the plurality of coating pipelines are arranged, and each coating pipeline is provided with the coating valve, so that each coating channel can be independently controlled, that is, each coating channel can independently control continuous coating and intermittent coating; therefore, when the same or different slurry layers are subjected to clearance coating and continuous coating, the problem of dislocation between the slurry layers can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a coating device and battery. BACKGROUND

[0002] The pole piece of part lithium ion battery usually includes current collector and active material slurry layer and ceramic slurry layer coated on the current collector, when making the pole piece, need coating device is utilized on the current collector coating active material slurry layer and ceramic slurry layer.

[0003] The coating device in the related art is usually divided into external ceramic slurry coating and built-in ceramic slurry coating, wherein the external ceramic slurry coating is prone to misalignment of the active material slurry layer and the ceramic slurry layer during the coating process due to its structural limitations, and the built-in ceramic slurry coating can only perform continuous coating and cannot perform gap coating process. SUMMARY

[0004] To solve the problem that the coating device in the related art cannot control the coating of the ceramic slurry layer and the active material slurry layer separately, the utility model provides a coating device.

[0005] The coating device of the utility model embodiment comprises:

[0006] The coating die head has a plurality of coating channels, a coating outlet and a coating inlet connected with the coating channels, and the plurality of coating outlets are used for coating the same or different coating layers.

[0007] The plurality of coating pipelines comprise a feeding pipe, one end of the feeding pipe is connected with the coating inlet, and a coating valve is arranged on the feeding pipe.

[0008] The coating device of the utility model embodiment comprises:

[0009] Therefore, the coating device of the utility model embodiment can simultaneously meet the needs of continuous and gap coating of the same or different slurry layers, and can also avoid misalignment between the slurry layers, thereby improving the coating precision.

[0010] In some embodiments, the coating device of the utility model embodiment comprises:

[0011] a coating die having a first coating channel and a first coating outlet and a first coating inlet in communication with the first coating channel, the first coating outlet being used for coating a first slurry layer; the coating die further having a second coating channel and a second coating outlet and a second coating inlet in communication with the second coating channel, the second coating outlet being used for coating a second slurry layer;

[0012] a first coating pipeline, the first coating pipeline comprising a first supply pipe, a first supply outlet of the first supply pipe being in communication with the first coating inlet, the first supply pipe further being provided with a first coating valve; an active material slurry

[0013] a second coating pipeline, the second coating pipeline comprising a second supply pipe, a second supply outlet of the second supply pipe being in communication with the second coating inlet, the second supply pipe further being provided with a second coating valve; a ceramic slurry

[0014] a supply system having a supply port and a return port, a first supply inlet of the first supply pipe being in communication with the supply port, a second supply inlet of the second supply pipe being in communication with the supply port.

[0015] The coating device of the embodiment of the present application can simultaneously meet the needs of continuous and intermittent coating of the second slurry layer and the first slurry layer, and can improve the coating precision.

[0016] Therefore, the coating device of the embodiment of the present application can simultaneously meet the needs of continuous and intermittent coating of the second slurry layer and the first slurry layer, and can improve the coating precision.

[0017] In some embodiments, the first coating line further comprises a first return pipe, a first return inlet of the first return pipe is in communication with the first supply pipe, a first return valve is arranged on the first return pipe, and a first return outlet of the first return pipe is in communication with the return port.

[0018] In some embodiments, the first supply pipe comprises a first supply branch pipe and a second supply branch pipe, the first coating line further comprises a first gap valve, the first gap valve comprises a first gap inlet, a first gap outlet and a second gap outlet;

[0019] one end of the first supply branch pipe is connected with the first coating inlet, the other end of the first supply branch pipe is connected with the first gap outlet, and the first coating valve is arranged on the first supply branch pipe;

[0020] one end of the second supply branch pipe is connected with the first gap inlet, the other end of the second supply branch pipe is connected with the second gap inlet, the first return inlet of the first return pipe is connected with the second gap outlet.

[0021] In some embodiments, the first coating line further comprises a first circulation pipe, the coating die further has a first circulation port in communication with the first coating channel, a first circulation inlet of the first circulation pipe is in communication with the first circulation port, and a first circulation outlet of the first circulation pipe is in communication with the first return pipe.

[0022] In some embodiments, the second coating line further comprises a second return pipe, a second return inlet of the second return pipe is in communication with the second supply pipe, a second return valve is arranged on the second return pipe, and a second return outlet of the second return pipe is in communication with the return port.

[0023] In some embodiments, the second supply pipe comprises a third supply branch pipe and a fourth supply branch pipe, the second coating line further comprises a second gap valve, the second gap valve comprises a second gap inlet, a third gap outlet and a fourth gap outlet;

[0024] one end of the third supply branch pipe is connected with the second coating inlet, the other end of the third supply branch pipe is connected with the third gap outlet, and the second coating valve is arranged on the third supply branch pipe;

[0025] one end of the fourth supply branch pipe is connected with the second gap inlet, the other end of the fourth supply branch pipe is connected with the supply port, and the second return inlet of the second return pipe is connected with the fourth gap outlet.

[0026] In some embodiments, the second coating pipeline further comprises a second circulation pipe, and the coating die further has a second circulation port in communication with the second coating channel, a second circulation inlet of the second circulation pipe is in communication with the second circulation port, and a second circulation outlet of the second circulation pipe is in communication with the second return pipe.

[0027] In some embodiments, the first coating channel has a first buffer cavity, and the second coating channel has a second buffer cavity.

[0028] The utility model further provides a kind of battery, including the pole piece coated using the coating device described in above embodiment, the pole piece includes current collector and the first slurry layer and second slurry layer on the current collector, the first slurry layer and the second slurry layer are distributed along the width direction of the pole piece, and at least one side edge of the current collector width direction is exposed to the first slurry layer, and covered with the second slurry layer. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the utility model embodiment, the drawings needed to be used in the description of the utility model embodiment will be simply introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without the creative labor of the person skilled in the art.

[0030] Figure 1 It is the structural schematic diagram of the coating device of the utility model embodiment;

[0031] Figure 2 It is the pole piece coated by the coating device of the utility model embodiment.

[0032] In the drawing:

[0033] 1, coating die;101, first coating channel;1011, first coating outlet;1012, first coating inlet;1013, first circulation port;1014, first buffer cavity;102, second coating channel;1021, second coating outlet;1022, second coating inlet;1023, second circulation port;1024, second buffer cavity;

[0034] 2, first coating pipeline;

[0035] 201, first supply pipe;2011, first supply inlet;2012, first supply outlet;

[0036] 202, first return pipe;2021, first return inlet;2022, first return outlet;

[0037] 203, first supply branch pipe;

[0038] 204, second feed branch pipe;

[0039] 205, first gap valve; 2051, first gap inlet; 2052, first gap outlet; 2053, second gap outlet;

[0040] 206, first circulation pipe; 2061, first circulation inlet; 2062, first circulation outlet; 2063, first circulation valve;

[0041] 3, second coating pipe;

[0042] 301, second feed pipe; 3011, second feed inlet; 3012, second feed outlet;

[0043] 302, second return pipe; 3021, second return inlet; 3022, second return outlet;

[0044] 303, third feed branch pipe;

[0045] 304, fourth feed branch pipe;

[0046] 305, second gap valve; 3051, second gap inlet; 3052, third gap outlet; 3053, fourth gap outlet;

[0047] 306, second circulation pipe; 3061, second circulation inlet; 3062, second circulation outlet; 3063, second circulation valve;

[0048] 4, feed system; 401, feed port; 402, return port;

[0049] 5, first coating valve;

[0050] 6, second coating valve;

[0051] 7, first return valve;

[0052] 8, second return valve;

[0053] 9, pole piece; 901, current collector; 902, second slurry layer; 903, first slurry layer;

[0054] 10, conveying roller. DETAILED DESCRIPTION

[0055] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clearly understood, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0056] In the description of the utility model, it is necessary to understand that the orientation or positional relationship 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 positional relationship shown based on the drawings, 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, unless otherwise specified.

[0057] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal glue injection of two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0058] The utility model discloses a coating device. Figure 1 The utility model discloses a coating device.

[0059] The utility model discloses a coating device, which comprises a coating die head 1 and a plurality of coating pipelines.

[0060] The coating die head 1 has a plurality of coating channels, a coating outlet and a coating inlet connected with the coating channels, and the plurality of coating outlets are used for coating the same or different coating layers; the coating pipeline comprises a feeding pipe, one end of the feeding pipe is connected with the coating inlet, and a coating valve is arranged on the feeding pipe.

[0061] The utility model discloses a coating device, which comprises a coating die head 1 and a plurality of coating pipelines.

[0062] Therefore, the coating device of the utility model embodiment can simultaneously meet the needs of continuous and intermittent coating of the same or different slurry layers, and can also avoid the problem that the slurry layers are not misaligned, thereby improving the coating precision.

[0063] The utility model discloses a coating device. Figure 1 Further describe the coating device of the utility model embodiment Therefore, the coating device of the utility model embodiment can simultaneously meet the needs of continuous and intermittent coating of the same or different slurry layers, and can also avoid the problem that the slurry layers are not misaligned, thereby improving the coating precision.

[0064] The coating device includes a coating die 1, a first coating pipeline 2, a second coating pipeline 3 and a feeding system 4, and further includes a conveying roller 10, which is used to drive the current collector 901 arranged thereon to move.

[0065] The coating die 1 has a first coating channel 101, a first coating outlet 1011 and a first coating inlet 1012 connected with the first coating channel 101, and the first coating outlet 1011 is used to coat the first slurry layer 903 on the current collector 901 arranged on the conveying roller 10; the coating die 1 further has a second coating channel 102, a second coating outlet 1021 and a second coating inlet 1022 connected with the second coating channel 102, and the second coating outlet 1021 is used to coat the second slurry layer 902 on the current collector 901 arranged on the conveying roller 10;

[0066] The first coating pipeline 2 includes a first feeding pipe 201, a first feeding outlet 2012 of the first feeding pipe 201 is connected with the first coating inlet 1012, and the first feeding pipe 201 is further provided with a first coating valve 5;

[0067] The second coating pipeline 3 includes a second feeding pipe 301, a second feeding outlet 3012 of the second feeding pipe 301 is connected with the second coating inlet 1022, and the second feeding pipe 301 is further provided with a second coating valve 6;

[0068] The feeding system 4 has a feeding port 401 and a return port 402, a first feeding inlet 2011 of the first feeding pipe 201 is connected with the feeding port 401, and a second feeding inlet 3011 of the second feeding pipe 301 is connected with the feeding port 401.

[0069] The utility model discloses a first coating pipeline 2 and a second coating pipeline 3 are arranged for the first coating channel 101 for coating the first slurry layer 903 and the second coating channel 102 for coating the second slurry layer 902 respectively, and the first coating pipeline 2 is arranged as a first feeding pipe 201 provided with a first coating valve 5, and the second coating pipeline 3 is arranged as a second feeding pipe 301 provided with a second coating valve 6.

[0070] It can be understood that the first slurry layer can be an active material slurry layer, and the second slurry layer can be a ceramic slurry layer.

[0071] Therefore, the coating device can meet the needs of continuous and intermittent coating of the second slurry layer 902 and the first slurry layer 903, and improve the coating precision.

[0072] In some embodiments, the first coating pipeline 2 further comprises a first return pipe 202, a first return inlet 2021 of the first return pipe 202 is in communication with the first feeding pipe 201, a first return valve 7 is arranged on the first return pipe 202, and a first return outlet 2022 of the first return pipe 202 is in communication with the return port 402.

[0073] When the first slurry layer 903 is continuously coated, the first coating valve 5 is opened, the first return valve 7 is closed, the active material slurry enters the first coating channel 101 from the first feeding pipe 201 and flows out from the first coating outlet 1011;

[0074] When the first slurry layer 903 is intermittently coated, the first coating valve 5 is closed, the first return valve 7 is opened, the active material slurry enters the first return pipe 202 from the first feeding pipe 201 and flows into the feeding system 4 from the first return outlet 2022, and the first coating outlet 1011 stops coating.

[0075] The coating device of the embodiment of the utility model through setting first return pipe 202, make active material slurry can flow back to feeding system 4 when gap coating is carried out to first slurry layer 903, avoid active material slurry in first return pipe 202 excessive siltation and lead to excessive pressure, improve security.

[0076] Further, the first feeding pipe 201 includes a first feeding branch pipe 203 and a second feeding branch pipe 204, and the first coating pipeline 2 further includes a first gap valve 205, the first gap valve 205 includes a first gap inlet 2051, a first gap outlet 2052 and a second gap outlet 2053.

[0077] One end of the first feeding branch pipe 203 is connected with the first coating inlet 1012, and the other end of the first feeding branch pipe 203 is connected with the first gap outlet 2052, and the first coating valve 5 is arranged on the first feeding branch pipe 203.

[0078] One end of the second feeding branch pipe 204 is connected with the first gap inlet 2051, and the other end of the second feeding branch pipe 204 is connected with the second gap inlet 3051, the first return inlet 2021 of the first return pipe 202 is connected with the second gap outlet 2053.

[0079] When the first slurry layer 903 is continuously coated, the first coating valve 5 is opened, the first gap valve 205 is connected with the first feeding branch pipe 203 and the second feeding branch pipe 204, the active material slurry flows from the first feeding branch pipe 203 to the second feeding branch pipe 204 through the first gap valve 205, and then flows into the first coating channel 101 and flows out through the first coating outlet 1011.

[0080] When the first slurry layer 903 is gap coated, the first coating valve 5 is closed, the first gap valve 205 is connected with the first feeding branch pipe 203 and the first return pipe 202, and the active material slurry flows from the first feeding branch pipe to the first return pipe 202 through the first gap valve 205, and then flows to the feeding system 4.

[0081] In some embodiments, the first coating pipeline 2 further includes a first circulation pipe 206, and the coating die 1 further has a first circulation port 1013 connected with the first coating channel 101, a first circulation inlet 2061 of the first circulation pipe 206 is connected with the first circulation port 1013, and a first circulation outlet 2062 of the first circulation pipe 206 is connected with the first return pipe 202.

[0082] The coating device of the embodiment of the utility model through setting up first circulation pipe 206 intercommunication first coating passage 101 and first return pipe 202, when the active material slurry pressure in first coating passage 101 is too big, the surplus active material slurry in first coating passage 101 can enter first return pipe 202 backflow to feed system 4 in through first circulation pipe 206, to maintain the pressure in first coating passage 101 in normal range, can guarantee the coating quality of first coating outlet 1011 in furtherance.

[0083] In some embodiments, the second coating pipeline 3 further comprises a second return pipe 302, the second return inlet 3021 of the second return pipe 302 is in communication with the second feed pipe 301, the second return pipe 302 is provided with a second return valve 8, and the second return outlet 3022 of the second return pipe 302 is in communication with the return port 402.

[0084] When the second slurry layer 902 is continuously coated, the second coating valve 6 is opened, the second return valve 8 is closed, the ceramic slurry enters the second coating passage 102 from the second feed pipe 301, and then flows out from the second coating outlet 1021;

[0085] When the second slurry layer 902 is intermittently coated, the second coating valve 6 is closed, the second return valve 8 is opened, the ceramic slurry enters the second return pipe 302 from the second feed pipe 301, and then flows into the feed system 4 from the second return outlet 3022, and the second coating outlet 1021 stops coating;

[0086] The coating device of the embodiment of the utility model is provided with the second return pipe 302, so that the ceramic slurry can flow back to the feed system 4 when the second slurry layer 902 is intermittently coated, and the safety is improved.

[0087] Further, the second feed pipe 301 comprises a third feed branch pipe 303 and a fourth feed branch pipe 304, and the second coating pipeline 3 further comprises a second gap valve 305, the second gap valve 305 comprises a second gap inlet 3051, a third gap outlet 3052 and a fourth gap outlet 3053;

[0088] One end of the third feed branch pipe 303 is connected with the second coating inlet 1022, the other end of the third feed branch pipe 303 is connected with the third gap outlet 3052, and the second coating valve 6 is arranged on the third feed branch pipe 303;

[0089] One end of the fourth feed branch pipe 304 is connected with the second gap inlet 3051, the other end of the fourth feed branch pipe 304 is in communication with the feed port 401, and the second return inlet 3021 of the second return pipe 302 is connected with the fourth gap outlet 3053.

[0090] When the second slurry layer 902 is continuously coated, the second coating valve 6 is opened, the second gap valve 305 connects the third supply branch pipe 303 and the fourth supply branch pipe 304, and the ceramic slurry flows from the third supply branch pipe 303 to the fourth supply branch pipe 304 through the second gap valve 305, and then flows into the second coating channel 102, and finally flows out through the second coating outlet 1021;

[0091] When the second slurry layer 902 is gap coated, the second coating valve 6 is closed, the second gap valve 305 connects the third supply branch pipe 303 and the second return pipe 302, and the ceramic slurry flows from the third supply branch pipe 303 to the second return pipe 302 through the second gap valve 305, and then flows to the supply system 4.

[0092] In some embodiments, the second coating pipeline 3 further comprises a second circulation pipe 306, and the coating die 1 further has a second circulation port 1023 connected with the second coating channel 102, a second circulation inlet 3061 of the second circulation pipe 306 is connected with the second circulation port 1023, and a second circulation outlet 3062 of the second circulation pipe 306 is connected with the second return pipe 302.

[0093] The coating device in the embodiment of the utility model can maintain the pressure in the first coating channel 101 within a normal range by connecting the first coating channel 101 and the first return pipe 202 through the first circulation pipe 206 when the pressure of the active material slurry in the first coating channel 101 is too high, so that the coating quality of the first coating outlet 1011 can be ensured.

[0094] In some embodiments, the first coating channel 101 has a first buffer cavity 1014, and the second coating channel 102 has a second buffer cavity 1024.

[0095] The coating device in the embodiment of the utility model can buffer the active material slurry entering the first coating channel 101 by arranging the first buffer cavity 1014 in the first coating channel 101, so that the pressure fluctuation of the active material slurry in the first coating channel 101 can be avoided. Similarly, the coating device in the embodiment of the utility model can buffer the ceramic slurry entering the second coating channel 102 by arranging the second buffer cavity 1024 in the second coating channel 102, so that the pressure fluctuation of the active material slurry in the second coating channel 102 can be avoided.

[0096] The utility model further provides a battery.

[0097] The battery in the embodiment of the utility model comprises the pole piece 9 coated by the coating device as described in the above embodiment, like Figure 2As shown, the pole piece 9 comprises a current collector 901 and a first slurry layer 903 and a second slurry layer 902 arranged on the current collector 901, the first slurry layer 903 and the second slurry layer 902 are distributed along the width direction of the pole piece, at least one side edge of the current collector 901 in the width direction is exposed from the first slurry layer 903 and covered with the second slurry layer 902;

[0098] It can be understood that the first slurry layer 901 can be an active material slurry layer; the second slurry layer 902 can be a ceramic slurry layer.

[0099] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; 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 coating apparatus, characterized in that, include: A coating die head having multiple coating channels and coating outlets and coating inlets connected to the coating channels, wherein the multiple coating outlets are used to coat the same or different coatings; Multiple coating pipelines, each including a feed pipe, one end of which is connected to the coating inlet, and a coating valve is provided on the feed pipe.

2. The coating apparatus according to claim 1, characterized in that, The coating die (1) has a first coating channel (101) and a first coating outlet (1011) and a first coating inlet (1012) connected to the first coating channel (101), wherein the first coating outlet (1011) is used to coat a first slurry layer (903); the coating die (1) also has a second coating channel (102) and a second coating outlet (1021) and a second coating inlet (1022) connected to the second coating channel (102), wherein the second coating outlet (1021) is used to coat a second slurry layer (902); Multiple coating pipelines include a first coating pipeline (2) and a second coating pipeline (3); The first coating pipeline (2) includes a first feed pipe (201), the first feed outlet (2012) of the first feed pipe (201) is connected to the first coating inlet (1012), and the first feed pipe (201) is also provided with a first coating valve (5). The second coating pipeline (3) includes a second feed pipe (301), the second feed outlet (3012) of the second feed pipe (301) is connected to the second coating inlet (1022), and a second coating valve (6) is also provided on the second feed pipe (301). It also includes a feeding system (4), which has a feeding port (401) and a return port (402). The first feeding inlet (2011) of the first feeding pipe (201) is connected to the feeding port (401), and the second feeding inlet (3011) of the second feeding pipe (301) is connected to the feeding port (401).

3. The coating apparatus according to claim 2, characterized in that, The first coating pipeline (2) also includes a first return pipe (202), the first return inlet (2021) of the first return pipe (202) is connected to the first supply pipe (201), the first return pipe (202) is provided with a first return valve (7), and the first return outlet (2022) of the first return pipe (202) is connected to the return port (402).

4. The coating apparatus according to claim 3, characterized in that, The first feed pipe (201) includes a first feed branch pipe (203) and a second feed branch pipe (204), and the first coating pipeline (2) further includes a first gap valve (205), which includes a first gap inlet (2051), a first gap outlet (2052), and a second gap outlet (2053). One end of the first feed branch pipe (203) is connected to the first coating inlet (1012), and the other end of the first feed branch pipe (203) is connected to the first gap outlet (2052). The first coating valve (5) is installed on the first feed branch pipe (203). One end of the second feeding branch pipe (204) is connected to the first gap inlet (2051), and the first return inlet (2021) of the first return pipe (202) is connected to the second gap outlet (2053).

5. The coating apparatus according to claim 3, characterized in that, The first coating pipeline (2) further includes a first circulation pipe (206), and the coating die head (1) also has a first circulation port (1013) connected to the first coating channel (101). The first circulation inlet (2061) of the first circulation pipe (206) is connected to the first circulation port (1013), and the first circulation outlet (2062) of the first circulation pipe (206) is connected to the first return pipe (202).

6. The coating apparatus according to claim 2, characterized in that, The second coating pipeline (3) also includes a second return pipe (302), the second return inlet (3021) of the second return pipe (302) is connected to the second supply pipe (301), the second return pipe (302) is provided with a second return valve (8), and the second return outlet (3022) of the second return pipe (302) is connected to the return port (402).

7. The coating apparatus according to claim 6, characterized in that, The second feed pipe (301) includes a third feed branch pipe (303) and a fourth feed branch pipe (304), and the second coating pipeline (3) also includes a second gap valve (305), which includes a second gap inlet (3051), a third gap outlet (3052) and a fourth gap outlet (3053). One end of the third feed branch pipe (303) is connected to the second coating inlet (1022), and the other end of the third feed branch pipe (303) is connected to the third gap outlet (3052). The second coating valve (6) is provided on the third feed branch pipe (303). One end of the fourth feed branch pipe (304) is connected to the second gap inlet (3051), and the other end of the fourth feed branch pipe (304) is connected to the feed port (401). The second return inlet (3021) of the second return pipe (302) is connected to the fourth gap outlet (3053).

8. The coating apparatus according to claim 6, characterized in that, The second coating pipeline (3) also includes a second circulation pipe (306), and the coating die head (1) also has a second circulation port (1023) connected to the second coating channel (102). The second circulation inlet (3061) of the second circulation pipe (306) is connected to the second circulation port (1023), and the second circulation outlet (3062) of the second circulation pipe (306) is connected to the second return pipe (302).

9. The coating apparatus according to claim 2, characterized in that, The first coating channel (101) has a first buffer cavity (1014), and the second coating channel (102) has a second buffer cavity (1024).

10. A battery, characterized in that, The electrode (9) is coated using the coating apparatus as described in any one of claims 1-9, the electrode (9) comprising a current collector (901) and a first slurry layer (903) and a second slurry layer (902) disposed on the current collector (901). The first slurry layer (903) and the second slurry layer (902) are distributed along the width direction of the electrode sheet. At least one edge of the current collector (901) in the width direction is exposed in the first slurry layer (903) and covered by the second slurry layer (902).

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