Collecting plate, battery and electric equipment

Abstract

The utility model relates to a collector plate, a battery and electric equipment, and relates to the technical field of batteries. The collector plate is used for being arranged between a roll core and a pole of a battery cell, and comprises a plate body, a pole connecting part and a plurality of fusing pieces, the disc body is used for being connected with a tab of a battery cell, the pole connecting part is used for being connected with a pole of the battery cell, the pole connecting part is arranged in the middle of the disc body, and a gap is formed between the pole connecting part and the disc body. The plurality of fusing pieces are connected between the disc body and the pole connecting part, the disc body and the pole connecting part are connected and conducted through the fusing pieces, and a temperature difference exists between the fusing temperatures of at least two fusing pieces. The current collecting disc provided by the utility model can solve the problem that the current collecting disc in the prior art can only perform fusing protection on the battery through a fusing structure and cannot reflect the internal working condition of the battery in advance, so that the safety of the battery is poor.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a collecting plate, a battery, and an electrical device. Background Art

[0002] During the battery cell production and assembly process, a current collector plate is typically installed between the winding core and the battery casing to provide electrical continuity. However, when operating under high current conditions or when a short circuit occurs, heat can accumulate inside the battery, leading to thermal runaway and ultimately, explosion. Therefore, a fuse structure is required on the current collector plate to prevent further thermal runaway and improve battery safety.

[0003] In the prior art, the collector tray fuse structure is typically configured to immediately fuse when the temperature reaches a preset temperature, thereby severing the battery circuit and preventing further operation. However, in actual use, this structure only reveals the internal battery temperature and other conditions when the collector tray fuse structure fuses after reaching the preset temperature, that is, when the battery stops operating. At this point, the internal battery temperature is generally close to the temperature at which thermal runaway occurs, resulting in poor battery safety. Utility Model Content

[0004] The purpose of this application is to provide a current collecting tray, a battery and an electrical device, which can solve the problem in the prior art that the current collecting tray can only provide fuse protection for the battery through a fuse structure but cannot reflect the internal working conditions of the battery in advance, resulting in poor battery safety.

[0005] In order to achieve the above-mentioned objectives, in a first aspect, the present application provides a current collecting disk for being arranged between the winding core and the pole of a battery cell, the current collecting disk comprising a disk body, a pole connecting portion and a plurality of fuses. The disk body is used to connect to the lug of the battery cell, the pole connecting portion is used to connect to the pole of the battery cell, the pole connecting portion is arranged in the middle of the disk body, and a gap is provided between the pole connecting portion and the disk body. A plurality of fuses are connected between the disk body and the pole connecting portion, the disk body and the pole connecting portion are connected and conducted through the fuses, and there is a temperature difference between the melting temperatures of at least two fuses.

[0006] Based on the above-mentioned embodiment of the present application, when the current collecting disk is in use, the current collecting disk is arranged between the electrode tab and the electrode post of the battery cell as a current collecting and conducting structure, and the fuse is arranged between the disk body and the electrode post connection portion as a connecting structure between the two. At the same time, the fuse can also melt when the internal heat of the battery cell is serious to cut off the current from the disk body to the electrode post connection portion, thereby cutting off the connection between the electrode tab and the electrode post, so that the connection between the battery cell and the external circuit is disconnected, thereby achieving the effect of protecting the battery cell and electrical equipment. By providing at least two fuses with different melting temperatures, when the battery cell is abnormally heated due to external or internal factors, when the battery cell temperature reaches the lowest melting temperature of the fuse, the fuse corresponding to the melting temperature will melt, and the internal resistance of the battery cell will increase, so that the internal heating condition of the battery can be fed back to the outside in a timely manner in the form of resistance value changes, so as to timely adjust the current condition of the battery cell to avoid further heating. At the same time, the melting of a single fuse at this time will not lead to the complete disconnection of the input and output circuits of the battery cell, and the battery cell can still continue to work. If the heating situation inside the battery cell cannot be controlled, at this time there is still at least one fuse that continues to work until the temperature inside the battery cell rises to the highest melting temperature corresponding to the remaining fuses. At this time, the last fuse blows, and the input and output circuits of the battery cell are completely disconnected to avoid thermal runaway of the battery cell. In summary, based on the above-mentioned settings of the present application, not only can the fuse be set to provide fuse protection when the battery cell is abnormally heated, but also based on the difference in the melting temperatures of different fuses, the temperature changes inside the battery cell can be reflected in stages at the same time as the fuse blows, thereby timely controlling the current situation of the battery cell from the outside, thereby further improving the safety of the battery cell when in use.

[0007] In some embodiments, at least two fuses are made of different materials, and there is a temperature difference between the fusing temperatures of the fuses made of different materials.

[0008] Based on the above embodiments of the present application, the fuses are made of materials with different fusing temperatures to achieve the difference in fusing temperatures between the fuses.

[0009] In some embodiments, a fuse element includes a fuse portion having a cross-sectional area perpendicular to the connection between the disk and the terminal, which is smaller than the cross-sectional area of ​​the remaining portion of the fuse element in the direction perpendicular to the connection between the disk and the terminal. The cross-sectional areas of the fuse portions of at least two fuse elements differ, resulting in a temperature difference between the melting temperatures of the at least two fuse elements.

[0010] Based on the above-described embodiments of the present application, by forming a fusing portion on the fuse, when the fuse is in use, the fuse will preferentially blow at the location of the fusing portion with a smaller cross-sectional area. Furthermore, by providing fusing portions with different cross-sectional areas on different fuses, different fusing temperatures can be achieved between the different fuses.

[0011] In some embodiments, the maximum melting temperature of the fuse is lower than the thermal runaway temperature of the battery cell.

[0012] Based on the above-mentioned embodiments of the present application, when the current collecting disk is used, it is necessary to cut off the current before the battery cell reaches the thermal runaway temperature to avoid the occurrence of thermal runaway. Therefore, the highest melting temperature of multiple fuses should be lower than the temperature of the battery cell during thermal runaway to ensure that all fuses can melt before the battery cell undergoes thermal runaway, so as to completely cut off the input and output circuits of the battery cell.

[0013] In some embodiments, the collecting disk further includes an insulating member, which is disposed in a gap between the disk body and the pole connecting portion.

[0014] Based on the above-mentioned embodiments of the present application, by arranging an insulating part in the gap position between the disk body and the pole connection part, on the one hand, the insulating part can serve as a connecting mechanism between the disk body and the pole connection part, so that the relative position between the disk body and the pole connection part can be fixed before and after the fuse is blown. On the other hand, the arrangement of the insulating part can also enhance the insulation effect between the disk body and the pole connection part, ensuring that only the fuse is used as a connecting conductive part between the two, so that after all the fuses are blown, the effect of cutting off the current of the battery cell can be achieved, thereby further improving the safety of the battery cell.

[0015] In some embodiments, the insulating member is located on a side of the fuse close to the winding core, and the insulating member covers a projection of the fuse toward the winding core.

[0016] Based on the above-mentioned embodiments of the present application, it is possible to catch the metal dripping from the fuse after it blows, thereby preventing the liquid metal generated after the fuse blows from dripping to the core position and causing damage to the core, and at the same time preventing the dripping metal material from overlapping with other structures and causing problems such as short circuit of the battery cell.

[0017] In some embodiments, a hollow portion is further provided on the disk body, and the extending direction of the hollow portion is the same as the direction of ion flow in the battery cell.

[0018] Based on the above-mentioned embodiments of the present application, by providing a hollow portion, and the extension direction of the hollow portion is the same as the ion flow direction, the flow of ions and electrolyte is further facilitated.

[0019] In a second aspect of the present application, a battery is provided, comprising a terminal, a winding core, and the aforementioned current collecting disk. The winding core is provided with a terminal lug at the end thereof, the current collecting disk is provided between the winding core and the terminal, the disk body is directly or indirectly connected to the terminal lug, and the terminal connecting portion is connected to the terminal.

[0020] Based on the above-mentioned embodiments of the present application, the battery provided herein includes the above-mentioned current collecting tray. Through the configuration of the above-mentioned current collecting tray, when the internal temperature of the battery rises during use, the fuses on the current collecting tray can melt sequentially as the temperature rises until all fuses melt. At this time, the input and output circuits of the battery are disconnected to reduce the possibility of further temperature rise of the battery, thereby improving the safety of the battery during use. At the same time, each fuse will cause the internal resistance of the battery to change after melting, thereby reflecting the changes in the internal temperature and operating state of the battery in the form of changes in the battery internal resistance, so as to adjust the battery operating state in a timely manner by adjusting the battery current from the outside.

[0021] The third aspect of the present application provides an electrical device, which includes a device body and the above-mentioned battery. A battery cavity is provided inside the device body, and the battery is provided in the battery cavity.

[0022] Based on the above embodiments of the present application, the electrical equipment provided by the present application includes the above batteries, and therefore also has the above beneficial effects. To avoid repetition, they will not be described here.

[0023] In some embodiments, the power-consuming device further includes a battery management system, which is electrically connected to the battery and can measure and control the current condition in the battery.

[0024] Based on the above-mentioned embodiments of the present application, the battery management system can detect the internal resistance of the battery, identify the changes in the temperature and working status inside the battery through the changes in the internal resistance of the battery, and at the same time adjust or cut off the internal current of the battery according to the changes in the internal resistance of the battery to avoid further heating inside the battery and causing thermal runaway.

[0025] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following detailed description, they are used to explain the present application but do not constitute a limitation of the present application. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the collecting plate provided in an embodiment of the present application.

[0028] Figure 2 Schematic plan view of the collecting plate provided in an embodiment of the present application.

[0029] Figure 3 Schematic diagram of the structure of the battery provided in the embodiment of the present application.

[0030] Description of Reference Numerals

[0031] 1. Disk; 11. Gap; 2. Pole connection; 3. Fuse; 31. Fuse part; 4. Insulator; 5. Hollow part; 6. Pole; 7. Shell; 71. Cover; 8. Winding core. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of this application, it should be noted that, unless otherwise stated, the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0038] During the battery cell production and assembly process, a current collector plate is typically installed between the winding core and the battery casing to provide electrical continuity. However, when operating under high current conditions or when a short circuit occurs, heat can accumulate inside the battery, leading to thermal runaway and ultimately, explosion. Therefore, a fuse structure is required on the current collector plate to prevent further thermal runaway and improve battery safety.

[0039] In the prior art, the collector tray fuse structure is typically configured to immediately fuse when the temperature reaches a preset temperature, thereby severing the battery circuit and preventing further operation. However, in actual use, this structure only reveals the internal battery temperature and other conditions when the collector tray fuse structure fuses after reaching the preset temperature, that is, when the battery stops operating. At this point, the internal battery temperature is generally close to the temperature at which thermal runaway occurs, resulting in poor battery safety.

[0040] In order to solve the above problems in the prior art, according to the first aspect of the present application, an embodiment of the present application provides a current collecting plate, which is used to be arranged between the winding core 8 and the pole 6 of the battery cell. Figures 1 to 3 As shown in the figure, the current collecting disk includes a disk body 1, a pole connecting portion 2, and multiple fuses 3. The disk body 1 is used to connect to the tab (not shown) of the battery cell, and the pole connecting portion 2 is used to connect to the pole 6 of the battery cell. The pole connecting portion 2 is arranged in the middle of the disk body 1, and a gap 11 is provided between the pole connecting portion 2 and the disk body 1. Multiple fuses 3 are connected between the disk body 1 and the pole connecting portion 2. The disk body 1 and the pole connecting portion 2 are connected and conductive through the fuses 3, and there is a temperature difference between the melting temperatures of at least two fuses 3.

[0041] It should be noted that the current collecting tray in the present application can be applicable to a variety of battery structures including cylindrical batteries and square batteries. At the same time, the current collecting tray in the present application is not only applicable to winding core structure batteries, but can also be applicable to battery structures processed by lamination process after adaptive adjustment of the current collecting tray structure.

[0042] Specifically, the specific shapes of the disc body 1 and the terminal connection portion 2 in this application can be any suitable configuration. For example, the disc body 1 can be specifically configured as a circular, oval, square, or other polygonal structure, and the terminal connection portion 2 can also be configured as one of the aforementioned various shapes. Taking a cylindrical battery as an example, in this case, the battery cell portion is an overall cylindrical structure, and the disc body 1 portion of the current collector can be configured as a corresponding circular structure, with a circular hole in the middle of the disc body 1, and the terminal connection portion 2 is disposed within the circular hole with a gap 11 between the disc body 1 and the terminal connection portion 2.

[0043] Furthermore, in the present application, the fuse 3 can be fixed to the disk body 1 and the pole connection part 2 respectively by welding or the like during specific setting. The welding connection can not only ensure a higher connection strength, but also reduce the impact on the conduction effect between the fuse 3 and the disk body 1 and the pole connection part 2.

[0044] Based on the above-mentioned embodiments of the present application, when the current collecting disk is in use, the current collecting disk is arranged between the pole ear and the pole 6 of the battery cell as a current collecting and conducting structure, and the fuse 3 is arranged between the disk body 1 and the pole connecting part 2 as a connecting structure between the two. At the same time, the fuse 3 can also melt when the heat inside the battery cell is severe to cut off the current from the disk body 1 to the pole connecting part 2, and then cut off the connection between the pole ear and the pole 6, so that the connection between the battery cell and the external circuit is disconnected, thereby achieving the effect of protecting the battery cell and electrical equipment.

[0045] By setting at least two fuses 3 with different melting temperatures, when the battery cell is abnormally heated due to external or internal factors, when the battery cell temperature reaches the lowest melting temperature of the fuse 3, a fuse 3 corresponding to the melting temperature will melt, and the internal resistance of the battery cell will increase, so that the heating situation inside the battery can be fed back to the outside in a timely manner in the form of a change in resistance value, so as to adjust the current situation of the battery cell in time to avoid the heating situation from becoming more serious. At the same time, the melting of a single fuse 3 at this time will not cause the complete disconnection of the battery cell input and output circuits, and the battery cell can still continue to work. If the heating situation inside the battery cell cannot be controlled, at this time there is still at least one fuse 3 to continue working until the temperature inside the battery cell rises to the highest melting temperature corresponding to the remaining fuses 3. At this time, the last fuse 3 will melt, and the input and output circuits of the battery cell will be completely disconnected to avoid the battery cell from eventually experiencing thermal runaway.

[0046] In summary, based on the above-mentioned settings of the present application, not only can the fuse 3 be set to provide fuse protection when abnormal heat is generated inside the battery cell, but also based on the difference in the melting temperatures of different fuses 3, the temperature changes inside the battery cell can be reflected in stages when the fuse 3 melts, thereby timely controlling the current of the battery cell from the outside, thereby further improving the safety of the battery cell when in use.

[0047] Specifically, when the battery cell is operating normally, the current generated by the winding core 8 is transmitted to the disk body 1 through the pole ear, and then transmitted to the pole connection part 2 through the fuse 3, and finally transmitted to the pole 6 part of the battery cell. The input and output of the battery cell current is realized through the connection between the pole 6 and the outside world.

[0048] When the internal temperature of the battery cell is abnormally heated due to external factors, for example, three fuses 3 are provided and the melting temperatures of the three fuses 3 are different. When the internal temperature of the battery cell reaches the lowest melting temperature of the three fuses 3, the fuse 3 with the lowest melting temperature will melt, causing the conductive structure between the disk body 1 and the pole connection part 2 to change from three fuses 3 to two fuses 3, thereby changing the internal resistance of the battery cell, while the battery cell remains connected to the outside world. At this time, the outside world can identify the abnormal temperature inside the battery cell through the change in the internal resistance of the battery cell, and can prevent the internal temperature of the battery cell from rising further by reducing the battery cell current.

[0049] Subsequently, when reducing the battery cell current or other methods cannot prevent the further temperature rise inside the battery cell, when the internal temperature of the battery cell reaches the melting temperature in the middle of the three fuses 3, the second fuse 3 will melt, and the abnormal temperature inside the battery cell will be reflected to the outside world in the form of changes in the internal resistance of the battery cell, so as to timely understand and adjust the working conditions inside the battery cell.

[0050] Finally, if the first two adjustments are unable to control the temperature rise inside the battery cell, when the internal temperature of the battery cell finally reaches the highest melting temperature of the fuse 3, the last fuse 3 will melt, and the circuit connection between the disk body 1 and the pole connection part 2 will be completely disconnected, thereby completely disconnecting the circuit connection between the battery cell and the outside world, which serves as a last resort to prevent thermal runaway of the battery cell.

[0051] In addition, it should be noted that the abnormal heating inside the battery cell until the battery cell thermal runaway usually includes several stages, such as the overheating stage, the heating stage, and the gas generation stage, and the temperature of the battery cell and the temperature change rate are different in each stage. Therefore, when setting the melting temperature difference of each fuse 3, the melting temperature of each fuse 3 can be set to the critical temperature of the battery cell in each stage. For example, the melting temperature of one fuse 3 can be set to the temperature of the battery cell when it is about to enter the heating stage in the overheating stage, and the melting temperature of another fuse 3 can be set to the temperature of the battery cell when it is about to enter the gas generation stage in the heating stage, so that the fuse 3 can more clearly and accurately reflect the situation inside the battery cell when it melts.

[0052] In the embodiment of the present application, the difference in fusing temperature between the fuse elements 3 can be achieved in any suitable manner.

[0053] In an exemplary embodiment provided in the present application, at least two fuses 3 may be made of different materials, and there is a temperature difference between the fusing temperatures of the fuses 3 made of different materials.

[0054] Based on the above-mentioned embodiment of the present application, taking the setting of three fuses 3 as an example, in one case, the three fuses 3 are set to three materials with different melting temperatures. For example, the three fuses 3 can be set to three different materials, namely, lead-tin alloy, lead-antimony alloy, and copper. In this case, when the temperature inside the battery cell rises abnormally, the three fuses 3 will melt at different temperatures. In another case, two of the three fuses 3 are set to the same material, while the other fuse 3 is set to another material with a different melting temperature. In this case, as the temperature inside the battery cell rises, two fuses will melt. Once, the two fuses 3 set to the same material will melt together, and the other time, the other fuse 3 will melt alone.

[0055] Alternatively, in another exemplary embodiment provided herein, a fuse 3 may be formed with a fuse portion 31, wherein the cross-sectional area of ​​the fuse portion 31 in a direction perpendicular to the direction from the disk body 1 to the pole connecting portion 2 is smaller than the cross-sectional area of ​​the remaining portions of the fuse 3 in the same direction. The cross-sectional areas of the fuse portions 31 of at least two fuses 3 differ, resulting in a temperature difference between the melting temperatures of the at least two fuses 3.

[0056] Based on the above-described embodiments of the present application, by forming a fusing portion 31 on the fuse 3, when the fuse 3 is in use, the fuse 3 will preferentially fuse at the location of the fusing portion 31 with a smaller cross-sectional area. Furthermore, by providing fusing portions 31 with different cross-sectional areas on different fuses 3, different fusing temperatures can be achieved between different fuses 3.

[0057] Specifically, if the cross-sectional area of ​​the fuse 3 is set to be large, the fuse 3 may not be quickly blown when in use, even if the battery core temperature reaches the melting temperature. However, by providing the fuse portion 31 on the fuse 3, the fuse 3 can be quickly blown when the melting temperature is reached, thereby improving the sensitivity of the fuse 3 and thus improving the overall safety of the battery core. At the same time, it can reduce the impact on the overall strength of the fuse 3, preventing the fuse 3 from being torn apart due to factors such as shaking during normal use.

[0058] Furthermore, in the present application, the fuse part 31 is provided so that when the fuse 3 blows, it preferentially blows at the fuse part 31. Therefore, it can be understood that the above-mentioned cross-sectional area restrictions on the fuse part 31 in the present application are all for limiting the size of the fuse 3 and the fuse part 31 in the thickness direction, that is, the above-mentioned cross-sectional areas all refer to the cross-sectional area of ​​the fuse 3 in the direction perpendicular to the disk body 1 to the pole connecting part 2.

[0059] Alternatively, in another exemplary embodiment provided in the present application, the fuse 3 can be made of different materials and a fuse portion 31 can be provided on the fuse 3. By combining the above two methods, the difference between the fusing temperatures of different fuses 3 can be expanded to better achieve the indication effect of abnormal temperature conditions inside the battery cell.

[0060] Furthermore, when specifically configuring the fuse 3, it is best to configure a fuse portion 31 with a smaller cross-sectional area on a fuse 3 made of a low-melting-point material, and a fuse portion 31 with a larger cross-sectional area on a fuse 3 made of a high-melting-point material. This avoids configuring a fuse portion 31 with a larger cross-sectional area on a fuse 3 made of a low-melting-point material, while simultaneously configuring a fuse portion 31 with a smaller cross-sectional area on a fuse 3 made of a high-melting-point material, thereby avoiding the situation in which the fuses 3 have similar melting temperatures as a result of the above configuration.

[0061] In the embodiments of the present application, the specific number of fuses 3 can be selected based on actual conditions. In specific configurations, the number of fuses 3 can be set to 2 to 5 as much as possible. If the number of fuses 3 is too small, the current requirement from the disc body 1 to the pole connection portion 2 may not be met. If the number of fuses 3 is too large, the number of welds between the fuse 3, the disc body 1, and the pole connection portion 2 increases, further complicating the production process and affecting processing efficiency.

[0062] In addition, it should be noted that, in the present application, the maximum melting temperature of the fuse 3 should be lower than the thermal runaway temperature of the battery cell.

[0063] Based on the above-mentioned embodiments of the present application, when the current collecting disk is used, it is necessary to cut off the current before the battery cell reaches the thermal runaway temperature to avoid the occurrence of thermal runaway. Therefore, the highest melting temperature of the multiple fuses 3 should be lower than the temperature of the battery cell when thermal runaway occurs, to ensure that all fuses 3 can be melted before thermal runaway occurs in the battery cell, so as to completely cut off the input and output circuits of the battery cell.

[0064] refer to Figure 1 and Figure 2 As shown in , in some embodiments of the present application, the collecting disk may further include an insulating member 4 , which is disposed in the gap 11 between the disk body 1 and the pole connecting portion 2 .

[0065] Based on the above-described embodiment of the present application, by providing an insulating member 4 in the gap 11 between the disc body 1 and the pole connection portion 2, the insulating member 4 can, on the one hand, serve as a connecting mechanism between the disc body 1 and the pole connection portion 2, thereby fixing the relative position between the disc body 1 and the pole connection portion 2 before and after the fuse 3 blows. On the other hand, the provision of the insulating member 4 can also enhance the insulation effect between the disc body 1 and the pole connection portion 2, ensuring that only the fuse 3 serves as the connecting conductive member between the two. Thus, after all fuses 3 have blown, the current in the battery cell can be cut off, further improving the safety of the battery cell.

[0066] In addition, it should be noted that the above-mentioned insulating member 4 is arranged in the gap 11 between the disk body 1 and the pole connecting part 2 in this application, which does not mean that the insulating member 4, the disk body 1 and the pole connecting part 2 are all located on the same horizontal plane.

[0067] It can be understood that the pole connecting portion 2 is arranged in the middle of the disk body 1 and a gap is provided between the two. In the specific setting, the disk body 1 and the pole connecting portion 2 can be located in the same horizontal plane, or the pole connecting portion 2 can protrude upward from the disk body 1 or be recessed downward from the disk body 1. Since the pole connecting portion 2 needs to be connected to the pole 6, in order to avoid direct contact between the pole 6 and the disk body 1, which may cause failure of the fuse 3, it is usually set that the pole connecting portion 2 protrudes from the disk body 1.

[0068] Based on this, let's take the example of a case where both the disc 1 and the pole connection 2 are configured as circular structures, with the pole connection 2 positioned within the circular hole in the center of the disc 1. When the disc 1 and the pole connection 2 are located on the same horizontal plane, the insulator 4 can be configured as a ring-shaped structure surrounding the exterior of the pole connection 2. When the pole connection 2 protrudes from the disc 1, in one scenario, the insulator 4 can be positioned at an angle to connect to the disc 1 and the pole connection 2, respectively. In another scenario, the insulator 4 can be configured as a circular structure and connected to the circular hole, with the pole connection 2 positioned directly above and connected to the insulator 4.

[0069] Furthermore, in the present application, the insulating member 4 can be connected to the gap 11 by any suitable means, for example, by providing a slot on the disc 1 so as to snap the insulating member 4 onto the disc 1. Alternatively, the insulating member 4 can be connected to the disc 1 and the pole connecting portion 2 by gluing or other means.

[0070] At the same time, in order to ensure the insulation effect of the insulating part 4 between the disk body 1 and the pole connecting part 2, in some embodiments of the present application, the insulation voltage of the insulating part 4 should meet the following requirements: when the applied DC voltage is greater than 500V, the leakage current should be less than 1mA for 60 seconds.

[0071] In some embodiments of the present application, the insulating member 4 may be disposed on a side of the fuse 3 close to the winding core 8 , and the insulating member 4 covers a projection of the fuse 3 toward the winding core 8 .

[0072] Based on the above-mentioned embodiments of the present application, it is possible to catch the metal dripping from the fuse 3 after it is melted, thereby preventing the liquid metal generated after the fuse 3 is melted from dripping to the position of the winding core 8 and causing damage to the winding core 8. At the same time, it is possible to prevent the dripping metal material from overlapping with other structures and causing problems such as short circuit of the battery cell.

[0073] Furthermore, the insulating member 4 can be made of any suitable insulating material. Furthermore, the material selection for the insulating member 4 should also take into account its high-temperature resistance so that the insulating member 4 can stably catch the dripping liquid metal. For example, the insulating member 4 can be made of various high-temperature resistant insulating materials such as ceramic, mica, and silicone rubber.

[0074] refer to Figure 1 and Figure 2 As shown in , in some embodiments of the present application, a hollow portion 5 may be further provided on the disk body 1 , and the extending direction of the hollow portion 5 is the same as the ion flow direction in the battery cell.

[0075] Based on the above-mentioned embodiments of the present application, by providing a hollow portion 5, and extending the hollow portion 5 in the same direction as the ion flow, the flow of ions and electrolyte is further facilitated. Furthermore, in a specific configuration, the hollow portion 5 can penetrate the disc body 1 along its thickness, facilitating processing while improving the flow diversion effect.

[0076] Specifically, when the battery cell is configured as a cylindrical wound core structure, the ions in the battery cell flow radially along the cylindrical structure. Therefore, the hollow portion 5 is opened along the radial direction of the battery cell, making the flow of electrolyte and ions inside the battery cell smoother. Similarly, when the battery cell is configured as a square laminated battery cell, the ions in the battery cell generally flow along the thickness direction of the laminated structure. Therefore, the direction of the opening of the hollow portion 5 can correspond to the thickness direction of the laminated structure.

[0077] On the basis of the above solution, according to the second aspect of the present application, the embodiment of the present application provides a battery, referring to Figure 3 As shown in , the battery includes a pole 6, a winding core 8 and the above-mentioned current collecting disk. The end of the winding core 8 is provided with a pole lug, and the current collecting disk is arranged between the winding core 8 and the pole 6. The disk body 1 is directly or indirectly connected to the pole lug, and the pole connecting portion 2 is connected to the pole 6.

[0078] Based on the above-described embodiments of the present application, the battery provided herein includes the above-described current collecting tray. Through the configuration of the above-described current collecting tray, when the battery experiences abnormal internal temperature rise during use, the fuses 3 on the current collecting tray can melt sequentially as the temperature rises until all fuses 3 melt. At this point, the battery's input and output circuits are disconnected, reducing the possibility of further temperature rise, thereby improving the safety of the battery during use. At the same time, each fuse 3 causes a change in the battery's internal resistance after melting, thereby reflecting changes in the battery's internal temperature and operating status to the outside world in the form of changes in the battery's internal resistance, allowing for timely external adjustments to the battery's operating status, such as by adjusting the battery's current.

[0079] Specifically, in some embodiments of the present application, the battery can be configured as a cylindrical wound core battery. In this case, the battery may further include a housing 7 and a cover plate 71. The housing 7 is open at one end, the wound core 8 is entirely disposed within the housing 7, the cover plate 71 is sealed at the open end of the housing 7, and the pole 6 is disposed on the cover plate 71. In this case, one end of the wound core 8 is connected to the collector plate via a tab, and then to the pole 6 via the collector plate, serving as the positive electrode of the battery. The other end of the wound core 8 can also be connected to the housing 7 by providing a tab, thereby serving as the negative electrode of the battery.

[0080] Based on the above basic solution, according to the third aspect of the present application, an embodiment of the present application provides an electric device, which includes a device body and the above-mentioned battery. A battery cavity is provided inside the device body, and the battery is provided in the battery cavity.

[0081] Based on the above embodiments of the present application, the electrical equipment provided by the present application includes the above batteries, and therefore also has the above beneficial effects. To avoid repetition, they will not be described here.

[0082] In some embodiments, the electrical device further includes a battery management system (BMS), which is electrically connected to the battery and can measure and control the current in the battery.

[0083] Based on the above-mentioned embodiments of the present application, the battery management system can detect the internal resistance of the battery, identify the changes in the temperature and working status inside the battery through the changes in the internal resistance of the battery, and at the same time adjust or cut off the internal current of the battery according to the changes in the internal resistance of the battery to avoid further heating inside the battery and ultimately leading to thermal runaway.

[0084] In the embodiments of this application, the battery management system may be any suitable battery management system component in the prior art. Since this application does not involve structural improvements to such components, no specific limitations are imposed. Furthermore, the connection and control methods of the battery management system may be any suitable configuration as long as they meet the aforementioned requirements for measuring and controlling the battery current.

[0085] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.

[0086] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0087] In addition, the various implementation methods of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. A current collecting plate, used to be arranged between the winding core and the pole of the battery cell, characterized in that: The collecting plate comprises: The disc is used to connect with the tab of the battery cell; A pole connecting portion, used to connect to the pole of the battery cell, wherein the pole connecting portion is provided in the middle of the disk body, and a gap is provided between the pole connecting portion and the disk body; A plurality of fuses are connected between the disk body and the pole connection portion. The disk body and the pole connection portion are connected and conducted through the fuses, and there is a temperature difference between the melting temperatures of at least two of the fuses.

2. The collecting plate according to claim 1, characterized in that: At least two of the fuses are made of different materials, and there is a temperature difference between the fusing temperatures of the fuses made of different materials.

3. The collecting plate according to claim 1 or 2, characterized in that: The fuse is formed with a fuse portion, wherein the cross-sectional area of ​​the fuse portion in a direction perpendicular to the disk body to the pole connecting portion is smaller than the cross-sectional area of ​​other parts of the fuse in the direction; There is a difference in cross-sectional area between the fuse portions of at least two of the fuse elements, so that there is a difference in melting temperatures between the at least two of the fuse elements.

4. The collecting plate according to claim 1, characterized in that: The maximum melting temperature of the fuse is lower than the thermal runaway temperature of the battery cell.

5. The collecting plate according to claim 1, characterized in that: The current collecting disk further includes an insulating member, which is arranged in a gap between the disk body and the pole connecting portion.

6. The collecting plate according to claim 5, characterized in that: The insulating member is located on a side of the fuse close to the winding core, and the insulating member covers a projection of the fuse toward the winding core.

7. The collecting plate according to claim 1, characterized in that: The disk body is further provided with a hollow portion, and the extending direction of the hollow portion is the same as the ion flow direction in the battery core.

8. A battery, characterized in that: The battery comprises: pole; A winding core, wherein the end of the winding core is provided with a tab; and The current collecting disk according to any one of claims 1 to 7, wherein the current collecting disk is arranged between the winding core and the pole, the disk body is directly or indirectly connected to the pole lug, and the pole connecting portion is connected to the pole.

9. An electrical device, characterized in that: The electrical equipment includes: a device body, having a battery cavity disposed therein; and The battery according to claim 8, wherein the battery is disposed in the battery cavity.

10. The electrical equipment according to claim 9, characterized in that: The electric device further includes a battery management system, which is electrically connected to the battery and can measure and control the current condition in the battery.

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