Pole piece, battery and manufacturing method of pole piece

Abstract

The application discloses a pole piece, and discloses a battery and a manufacturing method of the pole piece, wherein the pole piece comprises a current collector and an active material layer, the current collector has a thickness direction, the active material layer is connected to one side of the current collector along the thickness direction, and the active material layer is provided with a heat exchange flow channel for flowing of a heat exchange medium, so that the distance between the heat exchange medium and the current collector is shortened, the heat transfer path of the current collector to the heat exchange medium can be shortened, the thermal resistance can be reduced, the heat of the pole piece can be quickly taken away, the heat dissipation capacity of the battery is improved, the risk of thermal runaway of the battery is reduced, and the use safety of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an electrode, a battery, and a method for manufacturing the electrode. Background Technology

[0002] If a battery operates at high temperatures for an extended period, it is prone to thermal runaway, leading to battery failure or even explosion, posing a risk to the battery, the vehicle, and even people. To prevent battery failure and maintain the battery within its operating temperature range, a thermal management module is needed. This module absorbs battery heat, lowers the battery temperature, and ensures battery safety.

[0003] Existing thermal management modules are generally liquid cooling plates. Liquid cooling plates can remove heat from the surface of the battery, but they cannot remove internal heat from the battery cell in time, resulting in a higher risk of thermal runaway. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an electrode that can reduce the risk of thermal runaway in batteries.

[0005] The present invention also proposes a battery having the above-mentioned electrodes.

[0006] The present invention also proposes a manufacturing method for manufacturing the above-mentioned electrode sheet.

[0007] The electrode according to a first aspect embodiment of the present invention comprises: Current collector, having a thickness direction; An active material layer is connected to one side of the current collector along the thickness direction, and the active material layer is provided with heat exchange channels for the flow of heat exchange medium.

[0008] The electrode sheet according to the first aspect of the present invention has at least the following beneficial effects: By integrating the heat exchange channel onto the active material layer, the distance between the heat exchange medium and the current collector is shortened, which reduces the heat transfer path from the current collector to the heat exchange medium, reduces thermal resistance, and quickly removes heat from the electrode, thereby improving the battery's heat dissipation capacity, reducing the risk of thermal runaway, and thus improving the battery's safety.

[0009] In some embodiments of the present invention, the inner wall of the heat exchange channel is provided with a heat-conducting layer.

[0010] In some embodiments of the present invention, the current collector has a first direction perpendicular to the thickness direction, and the current collector is provided with tabs on one side along the first direction. The active material layer has a high-heat region near the tabs and a low-heat region away from the tabs. The heat exchange channel includes a plurality of first channels located in the high-heat region and a plurality of second channels located in the low-heat region. The density of the distribution of the first channels is greater than the density of the distribution of the second channels; and / or, The sum of the effective flow areas of all the first flow channels is greater than the sum of the effective flow areas of all the second flow channels.

[0011] In some embodiments of the present invention, the heat exchange channel has an inlet and an outlet, at least a portion of the first channel is connected to the second channel, the inlet is connected to the inlet end of the first channel and / or the inlet end of the second channel, and the outlet is connected to the outlet end of the second channel.

[0012] In some embodiments of the present invention, the heat exchange channel further includes a first collecting channel and a second collecting channel, wherein the first collecting channel connects to each of the first channels and the second collecting channel connects to each of the second channels.

[0013] In some embodiments of the present invention, the plurality of first flow channels include at least two annular flow channel segments and strip flow channel segments, wherein in adjacent annular flow channel segments, one of the annular flow channel segments extends around the outer periphery of another annular flow channel segment, and the strip flow channel segment connects the two adjacent annular flow channel segments.

[0014] In some embodiments of the present invention, the plurality of second channels are arranged radially or in a dendritic pattern.

[0015] In some embodiments of the present invention, the active material layer has a side surface perpendicular to the thickness direction, and a portion of the second flow channel is close to the edge of the side surface; and / or, a portion of the first flow channel is close to the edge of the side surface.

[0016] The battery according to a second aspect embodiment of the present invention comprises: The shell has a receiving cavity; A battery cell is housed within the receiving cavity. The battery cell includes a positive electrode and a negative electrode that are separated from each other. The positive electrode and / or the negative electrode are the electrodes described in the above embodiments.

[0017] The battery according to the second aspect embodiment of the present invention has at least the following beneficial effects: The electrode using the first aspect embodiment of the present invention integrates the heat exchange channel on the active material layer, thereby shortening the distance between the heat exchange medium and the current collector. This shortens the heat transfer path from the current collector to the heat exchange medium, reduces thermal resistance, and quickly removes heat from the electrode, thereby improving the battery's heat dissipation capacity, reducing the risk of thermal runaway, and thus improving the battery's safety.

[0018] In some embodiments of the present invention, the heat exchange channel has a liquid inlet and a liquid outlet, the housing is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel is connected to the liquid inlet, and the liquid outlet channel is connected to the liquid outlet.

[0019] In some embodiments of the present invention, the current collector has a first direction perpendicular to the thickness direction, the positive electrode sheet is provided with a positive electrode tab on one side along the first direction, and the negative electrode sheet is provided with a negative electrode tab on one side along the first direction; The active material layer is provided with a first high-heat zone, a second high-heat zone, and a low-heat zone. The first high-heat zone is close to the positive electrode tab, and the second high-heat zone is close to the negative electrode tab. The heat exchange channel includes a plurality of first channels and a plurality of second channels. The first high-heat zone and the second high-heat zone are respectively provided with the first channels, and the low-heat zone is provided with the second channels. The density of the distribution of the first channels is greater than the density of the distribution of the second channels.

[0020] In some embodiments of the present invention, the current collector has a second direction, the first direction, the second direction, and the thickness direction are perpendicular to each other, the heat exchange channel has an inlet and an outlet, the first high-heat zone and the second high-heat zone are arranged side by side along the second direction, the active material layer is provided with the inlet on both sides along the first direction, at least part of the first channel is connected to the second channel, the inlet end of the first channel is connected to the inlet, and the outlet end of the second channel is connected to the outlet.

[0021] A method for manufacturing an electrode according to a third aspect embodiment of the present invention, for manufacturing the electrode described in the first aspect embodiment of the present invention, includes the following steps: S1: Obtain a current collector, an active substance, a conductive agent, and a template material, wherein the template material is solid at a first temperature and decomposes and volatilizes at a second temperature, and the first temperature is lower than the second temperature; S2: Mix the active material and the conductive agent to form a mixture, and at the first temperature, dope the template material with the mixture to form an active material layer with the template material; S3: Press the active material layer with the template material and the current collector together, and heat the active material layer with the template material to a second temperature to cause the template material to decompose and volatilize, thereby forming the heat exchange channel in the active material layer.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the electrode structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the battery according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the template material according to an embodiment of the present invention.

[0024] Figure label: Current collector 100, active material layer 200, heat exchange channel 210, liquid inlet 211, liquid outlet 212, first channel 213, first annular channel section 2131, second annular channel section 2132, third annular channel section 2133, first strip channel section 2134, second strip channel section 2135, second channel 214, first converging channel 215, second converging channel 216, low-heat zone 220, first high-heat zone 230, second high-heat zone 240, tab 300, shell 400, positive tab 510, negative tab 520, template material 600. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0027] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0029] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] As mentioned earlier, if a battery operates at high temperatures for extended periods, it is prone to thermal runaway, leading to battery failure or even explosion, posing a risk to the battery, the vehicle, and even people. To prevent battery failure and maintain the battery within its operating temperature range, a thermal management module is needed. This module absorbs battery heat, lowers the battery temperature, and ensures battery safety. Existing thermal management modules are generally liquid cooling plates. While liquid cooling plates can remove heat from the battery's surface, they cannot effectively remove internal heat from the battery cells, resulting in a higher risk of thermal runaway.

[0031] Reference Figure 1 , Figure 1 This is a schematic diagram of the electrode structure in the first aspect embodiment of the present invention. As shown in the figure, the first aspect embodiment of the present invention proposes an electrode comprising a current collector 100 and an active material layer 200. The current collector 100 has a thickness direction, and the active material layer 200 is connected to one side of the current collector 100 along the thickness direction. The active material layer 200 is provided with a heat exchange channel 210 for supplying a heat exchange medium. The heat exchange medium can exchange heat with the current collector 100, thereby reducing thermal resistance, quickly removing heat from the electrode, improving the heat dissipation capacity of the battery, reducing the risk of thermal runaway of the battery, and thus improving the safety of battery use.

[0032] For example, when the battery is working, the heat exchange medium flows into the heat exchange channel 210 from the outside of the battery. Since the heat exchange channel 210 is integrated on the active material layer 200, the distance between the heat exchange medium and the current collector 100 is shortened, which can shorten the heat transfer path from the current collector 100 to the heat exchange medium, reduce thermal resistance, and quickly remove the heat from the electrode to improve the heat dissipation capacity of the battery, reduce the risk of thermal runaway of the battery, and thus improve the safety of battery use.

[0033] It should be noted that the heat exchange medium can be a low-viscosity, high-specific-heat-capacity, and high-boiling-point dielectric fluid. When the battery is in a high-temperature environment, the heat exchange medium can cool the active material layer 200 and the current collector 100; when the battery is in a low-temperature environment, the heat exchange medium can heat the active material layer 200 and the current collector 100, thereby ensuring the battery's charging and discharging efficiency. Details will not be elaborated here. It is understood that the heat exchange medium is a thermally conductive oil such as silicone oil. Silicone oil has stable chemical properties and good thermal conductivity. When silicone oil flows within the heat exchange channel, it does not undergo a redox reaction with the active material layer, and it can quickly remove heat from the electrode sheets.

[0034] It should be noted that the current collector 100 can be a metal foil or a composite current collector 100. In some embodiments, the metal foil is aluminum foil or copper foil. The composite current collector 100 includes an insulating support layer, a first metal layer, and a second metal layer, wherein the insulating support layer is a polymer, and the first metal layer and the second metal layer are respectively disposed on the upper and lower surfaces of the insulating support layer. Both the first metal layer and the second metal layer are aluminum metal layers or copper metal layers. The polymer material is selected from one or more of terephthalate, polyamide, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyethylene terephthalate.

[0035] In this embodiment, the inner wall of the heat exchange channel 210 is provided with a heat-conducting layer, which facilitates the rapid transfer of heat from the active material layer 200 to the heat exchange medium, thereby improving the heat exchange efficiency of the heat exchange medium and thus improving the heat dissipation capacity of the battery.

[0036] For example, by using atomic layer deposition (ALD), a thermally conductive layer is formed on the inner wall of the heat exchange channel 210. The thermal conductivity of this layer is greater than that of the active material layer 200, which facilitates the rapid transfer of heat from the active material layer 200 to the heat exchange medium, thereby improving the heat exchange efficiency of the heat exchange medium and thus enhancing the battery's heat dissipation capacity. It is understood that ALD is a method that deposits materials layer by layer onto a substrate surface in the form of single-atom films; details will not be elaborated upon here.

[0037] In this embodiment, the current collector 100 has a first direction, which is perpendicular to the thickness direction. The current collector 100 has a tab 300 on one side along the first direction. The active material layer 200 has a high-heat zone near the tab 300 and a low-heat zone 220 away from the tab 300. The heat exchange channel 210 includes a plurality of first channels 213 and a plurality of second channels 214. The plurality of first channels 213 are located in the high-heat zone, and the plurality of second channels 214 are located in the low-heat zone 220. The density of the distribution of the first channels 213 is greater than the density of the distribution of the second channels 214, which can prevent thermal runaway in the high-heat zone and avoid overcooling of the low-heat zone 220, thus avoiding waste of the cold energy of the heat exchange medium.

[0038] For example, density refers to the total length of the flow channels per unit area. The density of the distribution of the first flow channel 213 refers to the total length of the first flow channel 213 per unit area, and the density of the distribution of the second flow channel 214 refers to the total length of the second flow channel 214 per unit area. The first flow channel 213 is densely distributed in the high-heat zone, and the second flow channel 214 is sparsely distributed in the low-heat zone 220. This can increase the flow rate of the heat exchange medium in the high-heat zone, prevent thermal runaway in the high-heat zone, and avoid overcooling of the low-heat zone 220, which would lead to a waste of the cold energy of the heat exchange medium.

[0039] In this embodiment, the sum of the effective flow areas of all first flow channels 213 is greater than the sum of the effective flow areas of all second flow channels 214, which can increase the flow rate of the heat exchange medium in the high-heat zone, so as to prevent thermal runaway in the high-heat zone and avoid the waste of cold energy of the heat exchange medium due to overcooling of the low-heat zone 220.

[0040] It should be noted that the effective flow area of ​​the first flow channel 213 refers to the cross-sectional area of ​​the first flow channel 213 along the flow direction perpendicular to the heat exchange medium, and the effective flow area of ​​the second flow channel 214 refers to the cross-sectional area of ​​the second flow channel 214 along the flow direction perpendicular to the heat exchange medium, without any limitation.

[0041] In this embodiment, the heat exchange channel 210 has an inlet 211 and an outlet 212. The inlet end of the first channel 213 is connected to the inlet 211, the outlet end of the first channel 213 is connected to the inlet end of the second channel 214, and the outlet end of the second channel 214 is connected to the outlet 212, so that the heat exchange medium passes through the low-heat zone 220 and the high-heat zone in sequence. When the heat exchange medium flows through the high-heat zone, although the heat exchange medium has absorbed some of the heat from the low-heat zone 220 and the temperature of the heat exchange medium rises, the temperature of the heat exchange medium is still lower than the temperature of the high-heat zone. Because the first channel 213 is dense, the heat exchange medium can efficiently absorb a large amount of heat from the high-heat zone to fully cool the low-heat zone 220 and the high-heat zone. No limitation is made here.

[0042] In another embodiment, the inlet end of the first flow channel 213 is connected to the liquid inlet 211, the inlet end of the second flow channel 214 is connected to the liquid inlet 211, the outlet end of the first flow channel 213 is connected to the liquid outlet 212, and the outlet end of the second flow channel 214 is connected to the liquid outlet 212. The first flow channel 213 and the second flow channel 214 are arranged in parallel, and the heat exchange medium flows through the first flow channel 213 and the second flow channel 214 respectively, which can also fully cool the low heat zone 220 and the high heat zone. No limitation is made here.

[0043] In this embodiment, the heat exchange channel 210 further includes a first collecting channel 215 and a second collecting channel 216. The liquid inlet 211 is connected to each of the first channels 213 through the first collecting channel 215, and the liquid outlet 212 is connected to each of the second channels 214 through the second collecting channel 216. In this way, the external heat exchange medium is distributed to each of the first channels 213 through the first collecting channel 215, and the heat exchange medium in the second channel 214 is merged through the second collecting channel 216 and flows to the outside from the liquid outlet 212. This simplifies the channel structure and ensures uniform distribution of the heat exchange medium.

[0044] In this embodiment, the multiple first flow channels 213 include at least two annular flow channel segments and at least two strip flow channel segments. The at least two annular flow channel segments include a first annular flow channel segment 2131, a second annular flow channel segment 2132, and a third annular flow channel segment 2133. The at least two strip flow channel segments include a first strip flow channel segment 2134 and a second strip flow channel segment 2135. The second annular flow channel segment 2132 extends around the outer periphery of the first annular flow channel segment 2131, and the third annular flow channel segment 2133 extends around the outer periphery of the second annular flow channel segment 2132. The two ends of the first strip flow channel segment 2134 are respectively connected to the first annular flow channel segment 2131 and the second annular flow channel segment 2132. The two ends of the second strip flow channel segment 2135 are respectively connected to the second annular flow channel segment 2132 and the third annular flow channel segment 2133. This can increase the effective heat exchange area in the high-heat zone, ensure uniform cooling in the high-heat zone, and thus reduce the risk of thermal runaway in the high-heat zone.

[0045] It should be noted that multiple first strip-shaped flow channel sections 2134 are configured, and these multiple first strip-shaped flow channel sections 2134 are arranged circumferentially around the first annular flow channel section 2131. Multiple second strip-shaped flow channel sections 2135 are configured, and these multiple second strip-shaped flow channel sections 2135 are arranged circumferentially around the second annular flow channel section 2132. On the one hand, this can reduce the flow resistance of the heat exchange medium. On the other hand, it can cool the area where the high-heat zone is located between the first annular flow channel section 2131 and the second annular flow channel section 2132, and also cool the area where the high-heat zone is located between the third annular flow channel section 2133 and the second annular flow channel section 2132, ensuring uniform cooling of the high-heat zone. No restrictions are imposed here.

[0046] In this embodiment, the multiple second flow channels 214 are radially distributed, which allows the heat exchange medium to quickly reach various positions in the low-heat zone 220, uniformly cool the low-heat zone 220, and reduce the flow resistance of the heat exchange medium.

[0047] As another implementation, the multiple second flow channels 214 are distributed in a dendritic pattern, which can realize graded flow, uniformly cool the low heat zone 220, and reduce the flow resistance of the heat exchange medium.

[0048] In this embodiment, the active material layer 200 has a side surface perpendicular to the thickness direction, and a portion of the second flow channel 214 is close to the edge of the side surface, which can precisely cool the edge of the current collector 100 to avoid thermal runaway at the edge of the current collector 100, thereby improving the safety of the battery.

[0049] In this embodiment, a portion of the first flow channel 213 is located near the edge of the side, which can precisely cool the edge of the current collector 100 to prevent thermal runaway at the edge of the current collector 100, thereby improving the safety of the battery.

[0050] Reference Figure 2 , Figure 2 This is a schematic diagram of the battery structure according to an embodiment of the present invention. As shown in the figure, a second aspect embodiment of the present invention provides a battery including a housing 400 and a battery cell. The housing 400 has a receiving cavity, and the battery cell is housed in the receiving cavity. The battery cell includes a positive electrode and a negative electrode, which are separated. The positive electrode and / or the negative electrode are the same electrodes as those in the first aspect embodiment of the present invention, which can reduce thermal resistance and quickly dissipate heat from the electrodes to improve the battery's heat dissipation capacity, reduce the risk of thermal runaway, and thus improve the battery's safety in use.

[0051] For example, when the battery is working, the heat exchange medium flows into the heat exchange channel 210 from the outside of the battery. Since the heat exchange channel 210 is integrated on the active material layer 200, the distance between the heat exchange medium and the current collector 100 is shortened, which can shorten the heat transfer path from the current collector 100 to the heat exchange medium, reduce thermal resistance, and quickly remove the heat from the electrode to improve the heat dissipation capacity of the battery, reduce the risk of thermal runaway of the battery, and thus improve the safety of battery use.

[0052] Since the battery adopts all the technical solutions of the electrode sheets in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here. The battery can be a lithium battery or a solid-state battery. When the battery is a lithium battery, the positive and negative electrode sheets are separated by a separator; when the battery is a solid-state battery, the positive and negative electrode sheets are separated by a solid electrolyte layer.

[0053] In this embodiment, the housing 400 is provided with an inlet channel and an outlet channel. The inlet channel is connected to the inlet port 211, and the outlet channel is connected to the outlet port 212. The heat exchange channel 210 is connected to an external heat exchange system through the inlet channel and the outlet channel, which can form a complete heat exchange cycle system and provide a continuous heat exchange medium for the heat exchange channel 210, thereby improving the safety of battery use.

[0054] For example, the inlet and outlet channels are integrated on the housing 400. The inlet 211 of the heat exchange channels 210 of each electrode is connected to the inlet channel through a branch pipe, and the outlet 212 of the heat exchange channels 210 of each electrode is connected to the outlet channel through a manifold. The inlet and outlet channels are connected to an external heat exchange system, forming a complete heat exchange circulation system that provides a continuous supply of heat exchange medium to the heat exchange channels 210, thereby improving the safety of battery use. The external heat exchange system includes a heat exchanger, which can be a finned heat exchanger or a plate heat exchanger. The manifold or branch pipe can be a manifold, and there are no restrictions on its use.

[0055] In this embodiment, the current collector 100 has a second direction, and the first direction, the second direction, and the thickness direction are perpendicular to each other. A positive electrode sheet has a positive electrode tab 510 on one side along the first direction, and a negative electrode sheet has a negative electrode tab 520 on one side along the first direction. The positive and negative electrode sheets are located on the same side. The active material layer 200 has a first high-heat region 230, a second high-heat region 240, and a low-heat region 220. The first high-heat region 230 is close to the positive electrode tab 510, and the second high-heat region 240 is close to the negative electrode tab 520. The heat exchange channel 210 includes a first channel. The first high-heat zone 230 and the second high-heat zone 240 are respectively provided with the first flow channel 213, and the low-heat zone 220 is provided with the second flow channel 214. The distribution density of the first flow channel 213 is greater than that of the second flow channel 214. During the charging and discharging process of the battery, it is ensured that the heat on both sides of the positive tab 510 and the negative tab 520 can be quickly carried away by the heat exchange medium, so that the temperature distribution of the battery cell is more uniform, thereby reducing the risk of thermal runaway of the battery cell at the positive tab 510 or the negative tab 520.

[0056] For example, during the charging and discharging process of the battery, the electrode plate generates high heat near the tab 300, causing the active material layer 200 to form a first high-heat zone 230 near the positive tab 510 and a second high-heat zone 240 near the negative tab 520. By arranging multiple first flow channels 213 in the first high-heat zone 230 and the second high-heat zone 240 respectively, the heat exchange medium can be ensured to cool the first high-heat zone 230 and the second high-heat zone 240, making the temperature distribution of the battery cell more uniform, thereby reducing the risk of thermal runaway of the battery cell at the positive tab 510 or the negative tab 520.

[0057] In this embodiment, the first high-heat zone 230 and the second high-heat zone 240 are arranged side by side along the second direction. The active material layer 200 is provided with liquid inlets 211 on both sides along the second direction. At least part of the first flow channel 213 is connected to the second flow channel 214. The inlet end of the first flow channel 213 is connected to the liquid inlet 211, and the outlet end of the second flow channel 214 is connected to the liquid outlet 212. The first high-heat zone 230 and the second high-heat zone 240 are cooled efficiently, thereby reducing the risk of thermal runaway of the battery cell at the positive tab 510 or the negative tab 520.

[0058] It should be noted that the first flow channel 213 of the first high-heat zone 230 and the first flow channel 213 of the second high-heat zone 240 are arranged in parallel. The first flow channel 213 of the first high-heat zone 230 is connected to the liquid inlet 211 and the liquid outlet 212 respectively, and the first flow channel 213 of the second high-heat zone 240 is connected to the liquid inlet 211 and the liquid outlet 212 respectively. This can also efficiently cool the first high-heat zone 230 and the second high-heat zone 240, and no limitation is made here.

[0059] Reference Figure 1 , Figure 3 , Figure 3 This is a schematic diagram of the template material 600 according to an embodiment of the present invention. As shown in the figure, a third aspect embodiment of the present invention provides a method for manufacturing an electrode sheet, used to manufacture the electrode sheet of the first aspect embodiment of the present invention, comprising the following steps: S1: Obtain current collector 100, active material, conductive agent, and template material 600. At a first temperature, template material 600 is solid; at a second temperature, template material 600 decomposes and volatilizes. The first temperature is lower than the second temperature. S2: Mix the active material and conductive agent to form a mixture. At the first temperature, dope the template material 600 with the mixture to form an active material layer 200 with template material 600. S3: Press the active material layer 200 with template material 600 and the current collector 100 together. Heat the active material layer 200 with template material 600 to the second temperature to decompose and volatilize the template material 600, thereby forming a heat exchange channel 210 within the active material layer 200. This integration of the heat exchange channel 210 on the active material layer 200 reduces thermal resistance, quickly removes heat from the electrode, improves the battery's heat dissipation capacity, reduces the risk of thermal runaway, and thus improves the battery's safety.

[0060] It is understandable that by using template material 600, a heat exchange channel 210 of a specific shape can be pre-designed, which facilitates the manufacture of the heat exchange channel 210, and no restrictions are imposed here.

[0061] It should be noted that template material 600 can be materials such as polymethyl methacrylate microspheres that can decompose and volatilize at high temperatures, and there are no restrictions on this.

[0062] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An electrode, characterized in that, include: The current collector (100) has a thickness direction; An active material layer (200) is connected to one side of the current collector (100) along the thickness direction, and the active material layer (200) is provided with a heat exchange channel (210) for the flow of heat exchange medium.

2. The electrode sheet according to claim 1, characterized in that, The inner wall of the heat exchange channel (210) is provided with a heat-conducting layer.

3. The electrode sheet according to claim 1, characterized in that, The current collector (100) has a first direction perpendicular to the thickness direction, and the current collector (100) has a tab (300) on one side along the first direction. The active material layer (200) has a high-heat region near the tab (300) and a low-heat region (220) away from the tab (300). The heat exchange channel (210) includes a plurality of first channels (213) located in the high-heat region and a plurality of second channels (214) located in the low-heat region (220). The density of the distribution of the first channels (213) is greater than the density of the distribution of the second channels (214); and / or, The sum of the effective flow areas of all the first flow channels (213) is greater than the sum of the effective flow areas of all the second flow channels (214).

4. The electrode sheet according to claim 3, characterized in that, The heat exchange channel (210) has an inlet (211) and an outlet (212), at least part of the first channel (213) is connected to the second channel (214), the inlet (211) is connected to the inlet end of the first channel (213) and / or the inlet end of the second channel (214), and the outlet (212) is connected to the outlet end of the second channel (214).

5. The electrode sheet according to claim 3, characterized in that, The heat exchange channel further includes a first converging channel (215) and a second converging channel (216), wherein the first converging channel (215) connects to each of the first channels (213) and the second converging channel (216) connects to each of the second channels (214).

6. The electrode sheet according to claim 3, characterized in that, The plurality of first flow channels (213) include at least two annular flow channel segments and strip flow channel segments, wherein in adjacent annular flow channel segments, one of the annular flow channel segments extends around the outer periphery of another annular flow channel segment, and the strip flow channel segment connects the two adjacent annular flow channel segments.

7. The electrode sheet according to claim 3, characterized in that, Multiple second channels (214) are distributed radially or dendritly.

8. The electrode sheet according to claim 3, characterized in that, The active material layer (200) has a side surface perpendicular to the thickness direction, and a portion of the second flow channel (214) is close to the edge of the side surface; and / or, a portion of the first flow channel (213) is close to the edge of the side surface.

9. A battery, characterized in that, include: The housing (400) is provided with a receiving cavity; A battery cell is housed within the receiving cavity, the battery cell comprising a positive electrode and a negative electrode separated therefrom, the positive electrode and / or the negative electrode being the electrode as described in any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that, The heat exchange channel (210) has a liquid inlet (211) and a liquid outlet (212). The shell (400) is provided with a liquid inlet channel and a liquid outlet channel. The liquid inlet channel is connected to the liquid inlet (211), and the liquid outlet channel is connected to the liquid outlet (212).

11. The battery according to claim 9, characterized in that, The current collector (100) has a first direction perpendicular to the thickness direction, the positive electrode sheet is provided with a positive electrode tab (510) on one side along the first direction, and the negative electrode sheet is provided with a negative electrode tab (520) on one side along the first direction. The active material layer (200) is provided with a first high-heat zone (230), a second high-heat zone (240) and a low-heat zone (220). The first high-heat zone (230) is close to the positive electrode tab (510), and the second high-heat zone (240) is close to the negative electrode tab (520). The heat exchange channel (210) includes a plurality of first channels (213) and a plurality of second channels (214). The first high-heat zone (230) and the second high-heat zone (240) are respectively provided with the first channels (213), and the low-heat zone (220) is provided with the second channels (214). The density of the distribution of the first channels (213) is greater than the density of the distribution of the second channels (214).

12. The battery according to claim 11, characterized in that, The current collector (100) has a second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other. The heat exchange channel (210) has an inlet (211) and an outlet (212). The first high-heat zone (230) and the second high-heat zone (240) are arranged side by side along the second direction. The active material layer (200) is provided with the inlet (211) on both sides along the first direction. At least part of the first channel (213) is connected to the second channel (214). The inlet end of the first channel (213) is connected to the inlet (211), and the outlet end of the second channel (214) is connected to the outlet (212).

13. A method for manufacturing an electrode sheet, used to manufacture the electrode sheet according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1: Obtain a current collector (100), an active substance, a conductive agent, and a template material (600), wherein, at a first temperature, the template material (600) is solid, and at a second temperature, the template material (600) can decompose and volatilize, and the first temperature is lower than the second temperature; S2: Mix the active material and the conductive agent to form a mixture, and at the first temperature, dope the template material (600) with the mixture to form an active material layer (200) with the template material (600). S3: Press the active material layer (200) with the template material (600) and the current collector (100) together, and heat the active material layer (200) with the template material (600) to a second temperature to decompose and volatilize the template material (600), thereby forming the heat exchange channel (210) in the active material layer (200).

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