Pole piece and solid-state battery

Abstract

The utility model discloses a kind of pole piece, and a solid-state battery is disclosed, wherein pole piece includes current collector and active material layer, current collector has thickness direction, active material layer is connected to the thickness direction of current collector one side, current collector is equipped with for the heat exchange medium flow heat exchange runner, part heat exchange runner is dendritic distribution or radial distribution, so that heat exchange medium can directly occur heat exchange with current collector, can reduce thermal resistance, quickly take away the heat of current collector and active material layer, to improve the heat dissipation capacity of solid-state battery, reduce the thermal runaway risk of solid-state battery, to improve the use safety of solid-state battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an electrode and a solid-state battery. 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. Utility Model Content

[0004] This invention aims to solve at least 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 solid-state batteries.

[0005] This invention also proposes a solid-state battery having the aforementioned electrodes.

[0006] According to the electrode sheet in the first aspect embodiment of the present invention, it is applied to a solid-state battery, the electrode sheet comprising: Current collector, having a thickness direction; An active material layer is attached to one side of the current collector along the thickness direction; The current collector is provided with heat exchange channels for the flow of heat exchange medium, and some of the heat exchange channels are distributed in a dendritic or radial pattern.

[0007] The electrode sheet according to the first aspect of the present invention has at least the following beneficial effects: By integrating the heat exchange channels onto the current collector, the heat exchange medium can directly exchange heat with the current collector, which can reduce thermal resistance and quickly remove heat from the current collector and the active material layer. Moreover, since some heat exchange channels are distributed in a dendritic or radial pattern, the cooling of the current collector can be ensured to be uniform, thereby improving the heat dissipation capacity of the solid-state battery, reducing the risk of thermal runaway, and thus improving the safety of solid-state battery use.

[0008] In some embodiments of this utility model, the current collector is provided with a heat exchange channel for the flow of the heat exchange medium.

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

[0010] In some embodiments of this utility model, the current collector has a thickness direction and a first direction perpendicular to the thickness direction. The current collector has an electrode tab on one side along the first direction. The current collector has a high-heat region near the electrode tab and a low-heat region away from the electrode tab. 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 this utility model, the heat exchange channel has a liquid inlet and a liquid outlet, at least part of the first channel is connected to the second channel, the liquid inlet is connected to the inlet end of the first channel and / or the inlet end of the second channel, and the liquid outlet is connected to the outlet end of the second channel.

[0012] In some embodiments of this utility model, 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 this utility model, the plurality of first flow channels include at least two annular flow channel segments and strip flow channel segments. 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 this invention, the plurality of second flow channels are arranged radially or in a dendritic pattern.

[0015] In some embodiments of this 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] In some embodiments of this utility model, the current collector includes a first foil and a second foil stacked along the thickness direction of the current collector, and the first foil and the second foil are connected and enclosed to form the heat exchange channel.

[0017] The solid-state battery according to a second aspect embodiment of the present invention includes: 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. A solid electrolyte layer is connected between the positive electrode and the negative electrode. The positive electrode and / or the negative electrode are the electrodes described in the above embodiments.

[0018] The solid-state battery according to the second aspect embodiment of the present invention has at least the following beneficial effects: The electrode using the first aspect of this utility model integrates the heat exchange channels onto the current collector, allowing the heat exchange medium to directly exchange heat with the current collector. This reduces thermal resistance and quickly removes heat from the current collector and the active material layer. Furthermore, since some heat exchange channels are distributed in a dendritic or radial pattern, it ensures uniform cooling of the current collector, thereby improving the heat dissipation capacity of the solid-state battery, reducing the risk of thermal runaway, and thus improving the safety of the solid-state battery.

[0019] In some embodiments of this utility model, the heat exchange channel has a liquid inlet and a liquid outlet, the shell 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.

[0020] In some embodiments of this utility model, 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 current collector 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.

[0021] In some embodiments of this utility model, 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 current collector 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.

[0022] Additional aspects and advantages of this 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 sheet structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a solid-state battery according to an embodiment of the present invention.

[0024] Figure label: The components include: a current collector 100, a heat exchange channel 110, a liquid inlet 111, a liquid outlet 112, a first channel 113, a first annular channel section 1131, a second annular channel section 1132, a third annular channel section 1133, a first strip channel section 1134, a second strip channel section 1135, a second channel 114, a first converging channel 115, a second converging channel 116, a low-heat zone 120, a first high-heat zone 130, a second high-heat zone 140, an electrode tab 200, an active material layer 300, a shell 400, a positive electrode tab 510, and a negative electrode tab 520. Detailed Implementation

[0025] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0027] In the description of this utility model, "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 utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] In the description of this utility model, 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 this utility model. 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 including a current collector 100 and an active material layer 300. The active material layer 300 is connected to one side of the current collector 100 in the thickness direction. The current collector 100 is provided with heat exchange channels 110 for the flow of heat exchange medium. Some of the heat exchange channels 110 are distributed in a dendritic or radial pattern. The heat exchange medium can directly exchange heat with the current collector 100, which can reduce thermal resistance, quickly remove heat from the electrode, improve the heat dissipation capacity of the solid-state battery, reduce the risk of thermal runaway of the solid-state battery, and thus improve the safety of solid-state battery use.

[0032] For example, when a solid-state battery is working, the heat exchange medium flows into the heat exchange channel 110 from the outside of the solid-state battery. Since the heat exchange channel 110 is integrated on the current collector 100, the heat exchange medium can directly exchange heat with the current collector 100, which can reduce thermal resistance and quickly remove heat from the current collector 100 and the active material layer 300. Moreover, since some of the heat exchange channels 110 are distributed in a dendritic or radial pattern, it can ensure that the current collector 100 is cooled evenly, thereby improving the heat dissipation capacity of the solid-state battery, reducing the risk of thermal runaway of the solid-state battery, and thus improving the safety of solid-state battery use.

[0033] It should be noted that the heat exchange medium can be a dielectric fluid with low viscosity, high specific heat capacity, and high boiling point. When the solid-state battery is in a high-temperature environment, the heat exchange medium can cool the current collector 100; when the solid-state battery is in a low-temperature environment, the heat exchange medium can heat the current collector 100, thereby ensuring the charging and discharging efficiency of the solid-state battery. Details will not be elaborated here.

[0034] It should be noted that the current collector 100 can be a metal foil or a composite current collector. In some embodiments, the metal foil is aluminum foil or copper foil. The composite current collector 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 and second metal layers are respectively disposed on the upper and lower surfaces of the insulating support layer. Both the first and second metal layers are aluminum or copper metal layers, and 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 110 is provided with a heat-conducting layer, which is conducive to the rapid transfer of heat from the current collector 100 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 solid-state battery.

[0036] For example, by using atomic layer deposition (ALD) to form a thermally conductive layer on the inner wall of the heat exchange channel 110, the heat from the current collector 100 can be quickly transferred to the heat exchange medium, improving the heat exchange efficiency of the heat exchange medium and thus enhancing the heat dissipation capacity of the solid-state battery. It is understood that ALD is a method that deposits material layer by layer onto a substrate surface in the form of single-atom films, which will not be detailed here.

[0037] In this embodiment, the current collector 100 has a thickness direction and a first direction, the first direction being perpendicular to the thickness direction. The current collector 100 has a tab 200 on one side along the first direction. The current collector 100 has a high-heat zone near the tab 200 and a low-heat zone 120 away from the tab 200. The heat exchange channel 110 includes a plurality of first channels 113 and a plurality of second channels 114. The plurality of first channels 113 are located in the high-heat zone, and the plurality of second channels 114 are located in the low-heat zone 120. The density of the distribution of the first channels 113 is greater than the density of the distribution of the second channels 114, which can prevent thermal runaway in the high-heat zone and avoid overcooling of the low-heat zone 120, thus avoiding waste of the cold energy of the heat exchange medium.

[0038] For example, during the charging and discharging process of a solid-state battery, the current collector 100 generates high heat near the tab 200, forming a high-heat zone near the tab 200 and a low-heat zone 120 away from the tab 200. The first flow channel 113 is densely distributed in the high-heat zone, while the second flow channel 114 is sparsely distributed in the low-heat zone 120. 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 the low-heat zone 120, which would lead to a waste of the heat exchange medium's cold energy.

[0039] It should be noted that density refers to the total length of the flow channels per unit area. The density of the distribution of the first flow channel 113 refers to the total length of the first flow channel 113 per unit area, and the density of the distribution of the second flow channel 114 refers to the total length of the second flow channel 114 per unit area.

[0040] In this embodiment, the sum of the effective flow areas of all first flow channels 113 is greater than the sum of the effective flow areas of all second flow channels 114, 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 120.

[0041] It should be noted that the effective flow area of ​​the first flow channel 113 refers to the cross-sectional area of ​​the first flow channel 113 along the flow direction perpendicular to the heat exchange medium, and the effective flow area of ​​the second flow channel 114 refers to the cross-sectional area of ​​the second flow channel 114 along the flow direction perpendicular to the heat exchange medium, and there is no limitation here.

[0042] In this embodiment, the heat exchange channel 110 has an inlet 111 and an outlet 112. The inlet end of the first channel 113 is connected to the inlet 111, the outlet end of the first channel 113 is connected to the inlet end of the second channel 114, and the outlet end of the second channel 114 is connected to the outlet 112, so that the heat exchange medium passes through the low-heat zone 120 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 120 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 113 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 120 and the high-heat zone. No limitation is made here.

[0043] In another embodiment, the inlet end of the first flow channel 113 is connected to the liquid inlet 111, the inlet end of the second flow channel 114 is connected to the liquid inlet 111, the outlet end of the first flow channel 113 is connected to the liquid outlet 112, and the outlet end of the second flow channel 114 is connected to the liquid outlet 112. The first flow channel 113 and the second flow channel 114 are arranged in parallel, and the heat exchange medium flows through the first flow channel 113 and the second flow channel 114 respectively, which can also fully cool the low heat zone 120 and the high heat zone. No limitation is made here.

[0044] In this embodiment, the heat exchange channel 110 further includes a first collecting channel 115 and a second collecting channel 116. The liquid inlet 111 is connected to each of the first channels 113 through the first collecting channel 115, and the liquid outlet 112 is connected to each of the second channels 114 through the second collecting channel 116. In this way, the external heat exchange medium is distributed to each of the first channels 113 through the first collecting channel 115, and the heat exchange medium in the second channel 114 is merged through the second collecting channel 116 and flows to the outside from the liquid outlet 112. This simplifies the channel structure and ensures uniform distribution of the heat exchange medium.

[0045] In this embodiment, the plurality of first flow channels 113 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 1131, a second annular flow channel segment 1132, and a third annular flow channel segment 1133. The at least two strip flow channel segments include a first strip flow channel segment 1134 and a second strip flow channel segment 1135. The second annular flow channel segment 1132 extends around the outer periphery of the first annular flow channel segment 1131, and the third annular flow channel segment 1133 extends around the outer periphery of the second annular flow channel segment 1132. The two ends of the first strip flow channel segment 1134 are respectively connected to the first annular flow channel segment 1131 and the second annular flow channel segment 1132. The two ends of the second strip flow channel segment 1135 are respectively connected to the second annular flow channel segment 1132 and the third annular flow channel segment 1133. This can increase the effective heat exchange area in the high-heat zone, ensure uniform cooling in the high-heat zone, and thereby reduce the risk of thermal runaway in the high-heat zone.

[0046] It should be noted that multiple first strip-shaped flow channel sections 1134 are configured, and these multiple first strip-shaped flow channel sections 1134 are arranged circumferentially around the first annular flow channel section 1131. Multiple second strip-shaped flow channel sections 1135 are configured, and these multiple second strip-shaped flow channel sections 1135 are arranged circumferentially around the second annular flow channel section 1132. 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 1131 and the second annular flow channel section 1132, and also cool the area where the high-heat zone is located between the third annular flow channel section 1133 and the second annular flow channel section 1132, ensuring uniform cooling of the high-heat zone. No restrictions are imposed here.

[0047] In this embodiment, multiple second flow channels 114 are radially distributed, which allows the heat exchange medium to quickly reach various positions in the low-heat zone 120, uniformly cool the low-heat zone 120, and reduce the flow resistance of the heat exchange medium.

[0048] As another implementation, the multiple second flow channels 114 are distributed in a dendritic pattern, which can realize graded flow, uniformly cool the low-heat zone 120, and reduce the flow resistance of the heat exchange medium.

[0049] In this embodiment, the active material layer 300 has a side surface perpendicular to the thickness direction, and part of the second flow channel 114 is close to the edge of the side surface, which can accurately 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 solid-state battery use.

[0050] In this embodiment, a portion of the first flow channel 113 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 solid-state battery use.

[0051] In this embodiment, the current collector 100 includes a first foil and a second foil. The first foil and the second foil are stacked along the thickness direction of the current collector 100. The first foil and the second foil are connected and enclosed to form a heat exchange channel 110, which makes it easier to manufacture the heat exchange channel 110 on the current collector 100, thereby reducing the manufacturing difficulty of the current collector 100.

[0052] For example, ultraviolet laser ablation technology can be used to process a groove structure on the surface of the first foil or the second foil. When the first foil and the second foil are covered, the groove structure can be converted into a heat exchange channel 110, which makes it easier to manufacture the heat exchange channel 110 on the current collector 100, thereby reducing the manufacturing difficulty of the current collector 100.

[0053] It is understood that groove structures can also be processed on the surface of the first or second foil using precision electrochemical etching technology. Ultraviolet laser ablation technology and precision electrochemical etching technology are well-known existing technologies to those skilled in the art and will not be described in detail here.

[0054] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of a solid-state battery according to an embodiment of the present invention. As shown in the figure, a second aspect embodiment of the present invention provides a solid-state 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, a solid electrolyte layer, and a negative electrode. The solid electrolyte layer is connected between the positive electrode and the negative electrode. 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, thereby improving the heat dissipation capacity of the solid-state battery, reducing the risk of thermal runaway, and thus improving the safety of the solid-state battery.

[0055] When the solid-state battery is working, the heat exchange medium flows from the outside of the solid-state battery into the heat exchange channel 110 using the electrode of the first aspect embodiment of this utility model. Since the heat exchange channel 110 is integrated on the current collector 100, the heat exchange medium can directly exchange heat with the current collector 100, which can reduce thermal resistance and quickly remove the heat from the current collector 100. Moreover, since some of the heat exchange channels 110 are distributed in a dendritic or radial pattern, it can ensure that the current collector 100 is cooled evenly, thereby improving the heat dissipation capacity of the solid-state battery, reducing the risk of thermal runaway of the solid-state battery, and thus improving the safety of solid-state battery use.

[0056] Since solid-state batteries employ all the technical solutions of the electrode sheets described in the above embodiments, they possess at least all the beneficial effects brought about by the technical solutions described in the above embodiments, which will not be elaborated further here.

[0057] 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 111, and the outlet channel is connected to the outlet port 112. The heat exchange channel 110 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 110, thereby improving the safety of solid-state battery use.

[0058] For example, the inlet and outlet channels are integrated on the housing 400. The inlet 111 of the heat exchange channels 110 of each electrode is connected to the inlet channel through a branch pipe, and the outlet 112 of the heat exchange channels 110 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 110, thereby improving the safety of solid-state batteries. 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 no limitation is made here.

[0059] 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 current collector 100 has a first high-heat zone 130, a second high-heat zone 140, and a low-heat zone 120. The first high-heat zone 130 is close to the positive electrode tab 510, and the second high-heat zone 140 is close to the negative electrode tab 520. The heat exchange channel 110 includes a first channel 11. 3. The first high-heat zone 130 and the second high-heat zone 140 are respectively provided with the first flow channel 113, and the low-heat zone 120 is provided with the second flow channel 114. The distribution density of the first flow channel 113 is greater than that of the second flow channel 114. During the charging and discharging process of the solid-state 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 cell is more uniform, thereby reducing the risk of thermal runaway of the cell at the positive tab 510 or the negative tab 520.

[0060] For example, during the charging and discharging process of a solid-state battery, the current collector 100 generates high heat near the tab 200, causing the current collector 100 to form a first high-heat zone 130 near the positive tab 510 and a second high-heat zone 140 near the negative tab 520. By arranging multiple first flow channels 113 in the first high-heat zone 130 and the second high-heat zone 140 respectively, the heat exchange medium can be ensured to cool the first high-heat zone 130 and the second high-heat zone 140, making the temperature distribution of the cell more uniform, thereby reducing the risk of thermal runaway of the cell at the positive tab 510 or the negative tab 520.

[0061] In this embodiment, the first high-heat zone 130 and the second high-heat zone 140 are arranged side by side along the second direction. The current collector 100 is provided with liquid inlets 111 on both sides along the second direction. At least part of the first flow channel 113 is connected to the second flow channel 114. The inlet end of the first flow channel 113 is connected to the liquid inlet 111, and the outlet end of the second flow channel 114 is connected to the liquid outlet 112. This efficiently cools the first high-heat zone 130 and the second high-heat zone 140, thereby reducing the risk of thermal runaway of the battery cell at the positive tab 510 or the negative tab 520.

[0062] It should be noted that the first flow channel 113 of the first high-heat zone 130 and the first flow channel 113 of the second high-heat zone 140 are arranged in parallel. The first flow channel 113 of the first high-heat zone 130 is connected to the liquid inlet 111 and the liquid outlet 112 respectively, and the first flow channel 113 of the second high-heat zone 140 is connected to the liquid inlet 111 and the liquid outlet 112 respectively. This can also efficiently cool the first high-heat zone 130 and the second high-heat zone 140, and no limitation is made here.

[0063] 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. Within the scope of knowledge possessed by those skilled in the art, various changes can be made 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 sheet, used in solid-state batteries, characterized in that, include: The current collector (100) has a thickness direction; An active material layer (300) is attached to one side of the current collector (100) along the thickness direction; The current collector (100) is provided with heat exchange channels (110) for the flow of heat exchange medium, and some of the heat exchange channels (110) are distributed in a dendritic or radial pattern.

2. The electrode sheet according to claim 1, characterized in that, The inner wall of the heat exchange channel (110) is provided with a heat-conducting layer.

3. The electrode sheet according to claim 1, characterized in that, The current collector (100) has a thickness direction and a first direction perpendicular to the thickness direction. The current collector (100) has an electrode (200) on one side along the first direction. The current collector (100) has a high-heat region near the electrode (200) and a low-heat region (120) away from the electrode (200). The heat exchange channel (110) includes a plurality of first channels (113) located in the high-heat region and a plurality of second channels (114) located in the low-heat region (120). The density of the distribution of the first channels (113) is greater than the density of the distribution of the second channels (114); and / or, The sum of the effective flow areas of all the first flow channels (113) is greater than the sum of the effective flow areas of all the second flow channels (114).

4. The electrode sheet according to claim 3, characterized in that, The heat exchange channel (110) has an inlet (111) and an outlet (112), at least part of the first channel (113) is connected to the second channel (114), the inlet (111) is connected to the inlet end of the first channel (113) and / or the inlet end of the second channel (114), and the outlet (112) is connected to the outlet end of the second channel (114).

5. The electrode sheet according to claim 3, characterized in that, The heat exchange channel (110) further includes a first converging channel (115) and a second converging channel (116), wherein the first converging channel (115) connects to each of the first channels (113) and the second converging channel (116) connects to each of the second channels (114).

6. The electrode sheet according to claim 3, characterized in that, The plurality of first flow channels (113) 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 (114) are distributed radially or dendritly.

8. The electrode sheet according to claim 3, characterized in that, The active material layer (300) has a side surface perpendicular to the thickness direction, and a portion of the second flow channel (114) is close to the edge of the side surface; and / or, a portion of the first flow channel (113) is close to the edge of the side surface.

9. The electrode sheet according to claim 1, characterized in that, The current collector (100) includes a first foil and a second foil stacked along the thickness direction of the current collector (100), and the first foil and the second foil are connected and enclosed to form the heat exchange channel (110).

10. A solid-state 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 includes a positive electrode, a solid electrolyte layer, and a negative electrode. The solid electrolyte layer is connected between the positive electrode and the negative electrode. The positive electrode and / or the negative electrode is an electrode as described in any one of claims 1 to 9.

11. The solid-state battery according to claim 10, characterized in that, The heat exchange channel (110) has a liquid inlet (111) and a liquid outlet (112). 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 (111), and the liquid outlet channel is connected to the liquid outlet (112).

12. The solid-state battery according to claim 10, 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 current collector (100) is provided with a first high-heat zone (130), a second high-heat zone (140) and a low-heat zone (120). The first high-heat zone (130) is close to the positive electrode tab (510), and the second high-heat zone (140) is close to the negative electrode tab (520). The heat exchange channel (110) includes a plurality of first channels (113) and a plurality of second channels (114). The first high-heat zone (130) and the second high-heat zone (140) are respectively provided with the first channels (113), and the low-heat zone (120) is provided with the second channels (114). The density of the distribution of the first channels (113) is greater than the density of the distribution of the second channels (114).

13. The solid-state battery according to claim 12, characterized in that, The 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 (110) has an inlet (111) and an outlet (112). The first high-heat zone (130) and the second high-heat zone (140) are arranged side by side along the second direction. The collector (100) is provided with the inlet (111) on both sides along the first direction. At least part of the first channel (113) is connected to the second channel (114). The inlet end of the first channel (113) is connected to the inlet (111), and the outlet end of the second channel (114) is connected to the outlet (112).

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