An electrode tab and battery structure

Abstract

The application discloses an electrode tab and a battery structure. The electrode tab comprises a coating area and at least one thinning area. The coating area is coated with an active material. The thinning area extends from one end of the electrode tab along the length direction of the electrode tab. The active material coated on the thinning area has a thickness of n1, and the active material coated on the coating area has a thickness of n2. The relationship 0n1n2 is satisfied. The technical problem that heat runaway substances cannot be effectively released in the case of heat runaway in the existing battery structure is solved.

Description

Technical Field

[0001] This application relates to the field of battery safety technology, and in particular to an electrode sheet and a battery structure. Background Technology

[0002] To meet the growing consumer demand for longer driving range in electric vehicles, the power battery industry is continuously promoting the research and application of high-energy-density battery cells. In cell design, increasing energy density is one of the effective means to improve the overall vehicle range. Currently, common technical approaches include increasing the areal density of electrode sheets and the compaction density of active materials, thereby storing more energy within a limited volume. While these techniques have achieved some success in improving energy output, they also pose greater challenges to the thermal management and safety performance of the battery cells.

[0003] Especially for longer battery cell structures, due to their length-extending internal structure, the gas and heat generated inside the cell need to be released along a long exhaust path during extreme conditions such as thermal runaway. Such structures are more prone to rapid increases in internal pressure under high energy density designs, and the inability to expel gas and heat in time not only accelerates the spread of thermal runaway but may also lead to serious safety accidents such as explosions and fires, posing significant safety hazards. Therefore, in the design of high-energy-density battery cells, how to balance energy density with a safe release mechanism under thermal runaway conditions has become a pressing technical problem to be solved in this field. Utility Model Content

[0004] One objective of this application is to provide an electrode sheet and a battery structure that aims to solve the technical problem of the inability to effectively release thermal runaway substances in the event of thermal runaway in existing cell structures.

[0005] To achieve the above objectives, this application provides the following solution: an electrode sheet comprising a coating region coated with an active material; and at least one thinning region extending from one end of the electrode sheet along its length, wherein the thickness of the active material coated in the thinning region is n1, and the thickness of the active material coated in the coating region is n2, satisfying the relationship: 0 ≤ n1 <n2。

[0006] Optionally, the thickness of the active material coated in the thinning region is n1, and the thickness of the active material coated in the coating region is n2, satisfying the relationship: 0≤n1≤2 / 3n2.

[0007] Optionally, the length of the thinned region is t1, and the total length of the electrode sheet is t2, satisfying the relationship: 0 <t1≤t2。

[0008] Optionally, the length of the thinned region is t1, and the total length of the electrode sheet is t2, satisfying the relationship: 0.5t2 <t1≤t2。

[0009] Optionally, the number of thinning zones is m, satisfying the relationship: 1≤m≤4, where m is an integer.

[0010] Optionally, when the number of thinning regions is greater than 1, the thinning regions are arranged in parallel and at equal intervals along the width direction of the electrode sheet.

[0011] Optionally, in the width direction of the electrode sheet, the thinning region is concentrated in the central region of the electrode sheet.

[0012] Optionally, in the width direction of the electrode sheet, the thinning region is symmetrically distributed about the central axis of the electrode sheet along its length direction.

[0013] Optionally, the width of the thinning zone is d, satisfying the relationship: 1mm≤d≤3mm.

[0014] To achieve the above objectives, this application provides a solution: a battery structure including a positive electrode and a negative electrode, wherein the positive electrode and / or the negative electrode adopts the aforementioned electrode plates.

[0015] Optionally, when both the positive and negative electrode plates use the above-mentioned electrode plates, the positions of the thinning regions in the negative electrode plate and the positive electrode plate are opposite, and the area of ​​the thinning region in the negative electrode plate is smaller than the area of ​​the thinning region in the positive electrode plate.

[0016] Optionally, the battery structure also includes an explosion-proof valve, with the thinned area positioned close to the explosion-proof valve.

[0017] The beneficial effects of this application are as follows: Compared to the safety hazards caused by limited thermal diffusion in high-energy-density cells during thermal runaway in existing technologies, this application addresses the issue by creating thinning zones on the electrode sheets. These thinning zones, by reducing the coating thickness of the active material or leaving it uncoated, effectively increase the porosity and gas channels within the core package, thereby enhancing local porosity and gas diffusion capabilities. The spaced distribution of multiple thinning zones ensures both the overall structural integrity and electrochemical performance of the electrodes, while also creating longitudinal or radial channels to promote efficient heat and gas removal, mitigating the rapid accumulation of pressure and temperature within the cell and reducing the safety risks associated with limited thermal diffusion. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an electrode sheet provided in an embodiment of this application; Figure 2 This is provided by the embodiments of this application. Figure 1 A cross-sectional view along the AA direction; Figure 3 This is a schematic diagram of a battery structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of another battery structure provided in an embodiment of this application.

[0020] Explanation of icon numbers: 10. Coating area; 20. Thinning area; 30. Positive electrode sheet; 40. Negative electrode sheet; 50. Explosion-proof valve. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0024] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an electrode sheet provided in an embodiment of this application. Figure 1 The X direction shown is the electrode width direction, and the Y direction shown is the electrode length direction.

[0025] This application provides an electrode sheet designed to alleviate safety hazards in existing high-energy-density battery cells caused by restricted thermal diffusion due to obstructed exhaust paths and rapid increases in internal pressure during thermal runaway. By locally modifying the electrode sheet structure, this application effectively improves the cell's heat release capability under extreme operating conditions while maintaining its basic electrochemical performance.

[0026] Specifically, the electrode plate includes a coating area 10 and at least one thinning area 20. The coating area 10 has a conventional structure and is coated with electrode active material of a conventional thickness, mainly responsible for the electrochemical reaction function. Among them, the thinning area 20 extends from one end of the electrode plate along the length direction of the plate, is distributed at multiple specific positions, extends and arranges in a strip or stripe shape, and has a certain interval between adjacent thinning areas 20. The interval between the thinning areas 20 can be flexibly adjusted according to the size and structure design of the battery cell, and the preferred range of the interval is 5 mm to 8 mm, which can not only maintain good electrode integrity but also provide sufficient slow-release space when thermal runaway occurs.

[0027] Structurally, the thickness n1 of the active material coated in the thinning area 20 and the thickness n2 of the active material coated in the coating area satisfy the relationship: 0 ≤ n1 < n2. That is, the thinning area 20 has any one or a combination of the following two forms: First, the thinning area 20 is still coated with active material, but the coated thickness is significantly less than that of the conventional coating area 10. While ensuring partial electrochemical activity, the compaction density of this area is reduced and the local porosity is increased. Second, the thinning area 20 is not coated with active material at all, and the original state of the current collector is retained, further improving the pore permeability and gas channel ability of this area.

[0028] In this embodiment, the present application introduces the thinning area 20 into the electrode plate structure. On the premise of not significantly affecting the performance of the battery cell under normal conditions, when signs of thermal runaway such as overheating and gas evolution occur inside the battery cell, due to the property that the thinning area 20 has a lower compaction degree and a higher gas diffusion channel ability, the release efficiency of gas and heat inside the core package is significantly improved. Especially in the core package structure after winding or stacking, longitudinal or radial interval channels are formed between multiple thinning areas 20, enabling the battery cell to have a path for quickly导出 heat and gas in a specific direction, thereby effectively suppressing local pressure accumulation and sudden temperature rise, and improving the thermal stability and safety performance of the whole core.

[0029] Please refer to Figure 2 , Figure 2 is a cross-sectional view taken along the A-A direction provided by the embodiment of the present application. In some optimized embodiments, the thickness of the active material coated in the thinning area 20 is further limited. The thickness of the active material coated in the thinning area 20 is n1, and the thickness of the active material coated in the coating area 10 is n2. The two satisfy the following relationship: 0 ≤ n1 ≤ (2 / 3)·n2. In other words, the thinning area 20 can be not coated with active material at all (i.e., n1 = 0), or can be coated with a thinner layer of active material, and its thickness shall not exceed two-thirds of the conventional coating area 10.

[0030] ​​From the perspective of thermal safety, in extreme conditions such as thermal runaway of the battery cell, a large amount of gas and heat will be rapidly released inside. If the electrode tab structures are all dense layers with high compaction and high coating thickness, the gap between the tabs is extremely small (i.e., n1≥(2 / 3)·n2), making it difficult to provide an effective path for the rapid flow of gas and heat. This can easily cause gas to accumulate inside the core package, leading to a rapid increase in pressure in a local area and even serious consequences such as expansion and rupture, fire, and explosion. By setting a thinning zone 20 with a lower coating thickness on the electrode tab (i.e., 0≤n1≤(2 / 3)·n2), not only can a microchannel with conductivity be formed after winding or laminating, but also the gas permeability and heat diffusion ability of this area can be significantly improved, thereby building an "emergency release buffer zone" for the battery cell and effectively enhancing the self-slowing release ability of the entire cell at the initial stage of thermal runaway and suppressing heat spread.

[0031] Secondly, in terms of structural strength and adaptability of battery cell forming, reasonably retaining a certain thickness (such as n1 being 1 / 3·n2 or 1 / 2·n2) can enhance the supporting effect of the thinning zone 20 on the mechanical properties of the tab, preventing problems such as wrinkles, ruptures, or interlayer misalignments during the winding process of the tab due to local non-coating. Especially in application scenarios using high-speed coating and automated lamination production lines, abnormal conditions may occur in the fully exposed current collector area during operation due to uneven tension or insufficient flexibility of the tab. Therefore, allowing partial coating of active materials as mechanical support is an effective measure to improve structural stability without sacrificing process compatibility.

[0032] In addition, in some embodiments, the length range of the thinning zone 20 is restricted. The thinning zone 20 extends along the length direction of the electrode tab, and its length is denoted as t1, and the total length of the electrode tab is t2, and the relationship is satisfied: 0<t1 ≤ t2. The thinning zone 20 can be adjusted according to different battery cell sizes and performance requirements. The length of the thinning zone 20 gradually extends from the minimum value (close to zero) to the entire length of the tab, enabling precise control of the proportion of the thinning zone 20 as needed in batteries of different specifications.

[0033] When the length t1 of the thinning zone 20 approaches t2, the thinning zone 20 almost covers the entire length of the electrode tab, enabling the gas and heat generated during thermal runaway of the battery cell to rapidly diffuse and release along the depth direction of the electrode tab, thereby greatly enhancing the thermal slow-release ability of the battery cell and preventing the accumulation of internal pressure. This is particularly significant in high-energy-density batteries that require efficient exhaust and rapid heat dissipation.

[0034] On this basis, as a further optimized implementation method, please refer to Figure 1 , Figure 1It is a schematic structural diagram of an electrode tab provided by an embodiment of the present application. In some optimized embodiments, the length t1 of the thinning zone 20 and the total length t2 of the electrode tab satisfy the following relationship: 0.5·t2 < t1 ≤ t2. That is, the length of the thinning zone 20 exceeds half of the total length of the tab, and can extend up to the entire tab length at most.

[0035] When thermal runaway occurs, the rapid decomposition of the active material generates a large amount of gas, and this process usually starts from a high-temperature point in the middle of the tab or at one end, and the heat spreads towards both ends. If the thinning zone 20 is only arranged in a small area in the length direction of the tab, it cannot meet the requirements for the rapid release of gas and heat inside the long battery cell, and it is easy to form blockages and accumulations, resulting in too high pressure and triggering an explosion risk. By setting t1 > 0.5·t2, that is, letting the thinning zone 20 cover at least more than half of the tab length, a relatively complete and continuous internal drainage channel can be formed after winding or stacking, and a release path extending longitudinally or axially is formed between the tabs, enabling gas and heat to be quickly discharged along the depth direction of the core package structure, significantly improving the slow release efficiency of the battery cell in the initial stage of thermal runaway.

[0036] In some embodiments, the number of thinning zones 20 is m, and m satisfies the relationship: 1 ≤ m ≤ 4, where m is an integer. When m ≥ 1, that is, at least one thinning zone 20 is provided on the electrode tab, which can provide a basic gas release or buffer channel for the battery cell, so that in extreme cases such as thermal runaway, the local high temperature and gas pressure caused by chemical reactions can be effectively drained, reducing the impact on the surrounding structure, lowering the heat propagation speed, and improving the overall safety level of the battery cell. At the same time, the setting of a single or a small number of thinning zones 20 will not have too much impact on the overall coating area and energy-carrying density of the electrode tab, and can maintain a relatively good energy output ability while maintaining safety.

[0037] As the value of m increases, the distribution of the thinning zones 20 on the tab becomes more uniform, and theoretically, the heat release path can be further refined and the local heat diffusion efficiency can be improved. However, when m exceeds 4, that is, when the number of thinning zones 20 is greater than 4, the negative impacts will gradually appear. For example: more thinning zones 20 will significantly reduce the conventional coating area 10, lowering the overall active material loading, and directly affecting the capacity level of the battery cell; and a large number of modified structures will introduce more boundary regions and thickness transition regions, easily forming regions with uneven electrochemical performance, and then affecting the cycle stability and rate performance.

[0038] Therefore, by limiting the number m of the thinning zones 20 to between 1 and 4, it can not only ensure that the battery cell has a certain degree of safety slow release mechanism, but also avoid the structural degradation, performance loss and manufacturing problems caused by too many thinning zones 20, achieving a good balance between safety and energy density.

[0039] Furthermore, as an optimized implementation, when the number of thinning regions 20 is greater than 1, i.e., m ≥ 2, the multiple thinning regions 20 are preferably arranged in parallel and at equal intervals along the width direction of the electrode sheet. This arrangement not only achieves a regular distribution of the thinning regions 20 structurally, facilitating process implementation and quality control, but also balances the thermal response capability of the electrode sheet in the width direction.

[0040] In the event of thermal runaway or localized overheating, uneven distribution of the thinning regions 20 can lead to heat accumulation in certain areas, which cannot be released or alleviated in a timely manner, increasing the unevenness of heat diffusion and the risk of localized structural damage. By uniformly distributing multiple thinning regions 20 along the width of the electrode sheet, multiple relatively independent heat release channels can be constructed. This allows different areas to quickly initiate gas release and pressure relief when heated or reacting, effectively dispersing heat energy and gas pressure, and improving the cell's response to sudden events.

[0041] Meanwhile, the evenly spaced arrangement can keep the stress and coating thickness distribution of the electrode as balanced as possible in the width direction, reduce the problem of local stress concentration or electrochemical performance differences caused by uneven distribution of the thinning area, and help improve the stability and cycle life of the overall cell structure.

[0042] In some optimized embodiments, the thinning region 20 is not uniformly distributed along the width direction of the electrode sheet, but is further optimized to be concentrated in the central region of the electrode sheet. The central region refers to a certain range of areas near the central axis of symmetry as the electrode sheet extends from the edge to the center along its width direction.

[0043] When a battery cell operates under abnormal conditions, a temperature rise or reactive zone often occurs first in the center of the electrode sheet. If the thinning zone 20 is located in the center, it can quickly respond to the temperature rise and achieve heat release, pressure relief, or other preset functions, thereby effectively delaying or even blocking the development of thermal runaway. At the same time, the central region of the electrode sheet is usually in a position of relatively uniform stress during the winding or stacking of the battery cell. Concentrating the thinning zone 20 in this region helps to avoid the problem of local mechanical strength reduction at the edge of the electrode sheet, and prevents structural defects such as local breakage, uneven winding, or deformation caused by edge modification.

[0044] Based on this, as an optimized implementation, in some embodiments, multiple thinning regions 20 disposed on the electrode sheet are symmetrically distributed in the width direction about the central axis of the electrode sheet along its length direction. The electrode sheet is usually a long strip structure, with its length much greater than its width, and its length direction corresponds to the main axis direction of battery winding or stacking. The central axis refers to the geometric center line along the length direction of the electrode sheet. The multiple thinning regions 20 are located on both sides of the central axis in the width direction, and they are basically consistent with each other in terms of size, spacing, shape, and modification parameters, thus forming a mirror-symmetrical distribution.

[0045] The symmetrical distribution not only maintains geometric balance but, more importantly, creates excellent symmetry in material properties and stress distribution. In actual processing, this helps maintain the consistency of the modified layer's effect during winding or stacking, avoiding problems such as uneven thickness, winding stress misalignment, and stacking stress imbalance caused by unilateral modification. Furthermore, during battery use, the volume expansion caused by charging and discharging has directional characteristics. The symmetrically distributed thinning region 20 can effectively guide the expansion stress to be released synchronously on both sides, thereby avoiding localized stress concentration or deformation imbalance, further improving the structural stability and lifespan of the cell during cycling.

[0046] In some optimized embodiments, the width of the thinning region 20 disposed on the electrode sheet is d, preferably satisfying the following relationship: 1mm≤d≤3mm. If the width of the thinning region 20 is less than 1mm, the resulting pore space is limited, making it difficult to effectively regulate the flow of high-pressure gas in practical use. Furthermore, due to its small size, the pressure relief channel is limited, which may lead to local accumulation of gas between the electrode sheet and the diaphragm in extreme cases, increasing the risk of membrane rupture or bulging and reducing safety performance.

[0047] Conversely, if the width of the thinning region 20 exceeds 3mm, although the pore volume increases, it will occupy too much inactive area, reduce the active material load per unit area, and thus adversely affect the energy density of the battery. Furthermore, the modification of the wide region will disrupt the overall mechanical balance of the electrode, affect its deformation adaptability during winding or stacking, and reduce structural stability.

[0048] Therefore, it is preferable to set the width of the thinning region 20 between 1 mm and 3 mm, which can realize the rapid pressure relief and heat dissipation function of the pore structure under thermal runaway, while taking into account energy density, structural integrity and manufacturing process adaptability, thereby improving the performance of the cell structure while taking into account its energy density and group compatibility.

[0049] Please see Figure 3 , Figure 3 This is a schematic diagram of a battery structure provided in an embodiment of this application.

[0050] This application also provides a battery structure to fully leverage the technical advantages of the aforementioned electrode sheets in improving battery safety performance. Specifically, the battery structure includes a positive electrode 30 and a negative electrode 40, wherein both the positive electrode 30 and / or the negative electrode 40 employ the aforementioned electrode sheets, i.e., at least one of them employs the aforementioned electrode sheet. The electrode sheet has at least one thinning region 20, which is used to improve the control capability of thermal runaway while maintaining the basic electrochemical performance of the electrode sheet.

[0051] This application introduces a thinning region 20 on the positive electrode 30 and / or the negative electrode 40. During normal operation, the battery structure maintains excellent energy density and electrochemical stability. In extreme cases of thermal runaway caused by abnormal operating conditions (such as overcharging, external short circuits, or high-temperature environments), the thinning region 20 effectively forms a rapid pressure relief path for internal gas and heat, thereby reducing the risk of explosion due to increased internal pressure and improving the overall safety level of the battery structure. The thinning region 20 offers flexible adjustment in size, number, and arrangement, thus providing good adaptability and scalability to the electrode sheets and battery structure, making it suitable for battery cell products with different capacities, sizes, and performance levels.

[0052] In some embodiments of this application, in order to further optimize the energy efficiency and safety performance of the battery structure, both the positive electrode 30 and the negative electrode 40 adopt the electrode structure with the thinning region 20 provided above. Structurally, the position of the thinning region 20 in the negative electrode 40 is opposite to the position of the thinning region 20 in the positive electrode 30, so that the thinning region 20 can be precisely matched when the two are wound or stacked, thereby improving the continuity of the exhaust channel and the heat release efficiency of the overall core pack.

[0053] Based on this, since the negative electrode, as the lithium-ion insertion carrier, needs to maintain a relatively sufficient reserve of active material during normal operation of the battery cell, it is necessary to ensure that lithium ions can be stably and effectively inserted and extracted during charge and discharge cycles. If an excessively large blank thinning region 20 is set in the negative electrode sheet 40, it may lead to insufficient active material, thereby affecting the negative electrode capacity, causing a decrease in negative electrode utilization, and even affecting the lifespan and performance stability of the entire battery cell.

[0054] In contrast, the positive electrode has a relatively higher tolerance for the empty foil area. Especially under the premise that the thinning region 20 mainly undertakes the functions of thermal runaway exhaust and heat release, by setting a large area of ​​thinning region 20 in the positive electrode sheet 30, it is beneficial to quickly release the gas and heat accumulated inside the core package when thermal anomalies occur, reduce the internal pressure and temperature rise rate, and suppress the risk of thermal diffusion.

[0055] Therefore, in this embodiment, the areas of the thinning regions 20 in the positive and negative electrode sheets 40 are configured differently. The area of ​​the thinning region 20 in the negative electrode sheet 40 is smaller than that in the thinning region 20 in the positive electrode sheet 30. By taking into account the balance between safety improvement and capacity maintenance, it helps to improve the overall performance of the battery cell in high energy density scenarios.

[0056] Please see Figure 4 , Figure 4 This is a schematic diagram of another battery structure provided in an embodiment of this application. In some optimized embodiments, the battery structure further includes an explosion-proof valve 50 disposed on the casing, used to release high-pressure gas in a timely manner under extreme conditions such as thermal runaway, violent gas release, or abnormal temperature rise inside the battery cell, to prevent the casing structure from rupturing due to excessive internal pressure, and to improve the overall system's safety protection capability.

[0057] In this embodiment, the thinning region 20 in the electrode sheet is optimally positioned relative to the explosion-proof valve 50 in the cell structure, with the thinning region 20 facing and close to the explosion-proof valve 50. By placing the thinning region 20 closer to the explosion-proof valve 50, gas can quickly accumulate and be guided to the opening area of ​​the explosion-proof valve 50 during thermal runaway, thereby shortening the gas release path, reducing the internal pressure gradient, and improving pressure relief efficiency. To a certain extent, this guides the concentrated release of local heat and pressure inside the cell, reduces the lateral diffusion of high-temperature and high-pressure gas inside the cell, reduces the thermal conduction impact on other cells or structural components, and prevents further spread of thermal runaway.

[0058] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0059] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An electrode tab, characterized by, include: The coated area is coated with an active material; At least one thinning region extends along the length of one end of the electrode sheet, the active material coating the thinning region has a thickness of n1, and the active material coating the coating region has a thickness of n2, satisfying the relationship: 0 ≤ n1 <n2。 2. The electrode patch of claim 1, wherein, The thickness of the active material coated in the thinning zone is n1, and the thickness of the active material coated in the coating zone is n2, satisfying the relationship: 0≤n1≤2 / 3n2.

3. The electrode patch of claim 1, wherein, The length of the thinning region is t1, and the total length of the electrode sheet is t2, satisfying the relationship: 0 <t1≤t2。 4. The electrode patch of claim 3, wherein, The length of the thinned region is t1, and the total length of the electrode sheet is t2, satisfying the relationship: 0.5t2. <t1≤t2。 5. The electrode patch of claim 1, wherein, The number of thinning zones is m, and the thinning zones are spaced apart from each other, satisfying the relationship: 1≤m≤4, where m is an integer.

6. The electrode patch of claim 5, wherein, When the number of thinning regions is greater than 1, the thinning regions are arranged in parallel and at equal intervals along the width direction of the electrode sheet.

7. The electrode patch of claim 6, wherein, In the width direction of the electrode sheet, the thinning region is concentrated in the central region of the electrode sheet.

8. The electrode patch of claim 6, wherein, In the width direction of the electrode sheet, the thinning region is symmetrically distributed about the central axis of the electrode sheet along its length direction.

9. The electrode panel of any one of claims 1 to 8, wherein, The width of the thinning zone is d, which satisfies the relationship: 1mm≤d≤3mm.

10. A battery structure, characterized by It includes a positive electrode and a negative electrode, wherein the positive electrode and / or the negative electrode adopts the electrode as described in any one of claims 1 to 9.

11. The battery structure of claim 10, wherein, When both the positive electrode and the negative electrode are electrode sheets as described in any one of claims 1 to 9, the positions of the thinning regions in the negative electrode and the positive electrode are opposite, and the area of ​​the thinning region in the negative electrode is smaller than the area of ​​the thinning region in the positive electrode.

12. The battery structure according to any one of claims 10 or 11, characterized in that, The battery structure also includes an explosion-proof valve, and the thinning area is located near the explosion-proof valve.

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