Sheet-shaped battery and power supply device

Abstract

The utility model discloses a sheet battery and a power supply device. The sheet battery comprises a plurality of positive plates, a plurality of negative plates, a plurality of groups of positive current collectors and a plurality of groups of negative current collectors. The plurality of positive plates and the plurality of negative plates are alternately stacked; each group of positive current collectors comprises a plurality of positive current collectors connected with the leading-out side of the corresponding positive plate, and the span of the plurality of positive current collectors accounts for more than 50% of the length of the leading-out side; each group of negative current collectors comprises a plurality of negative current collectors connected with the leading-out side of the corresponding negative plate, and the span of the plurality of negative current collectors accounts for more than 50% of the length of the leading-out side. Compared with the prior art that a positive current collector and a negative current collector are arranged in a small area of a leading-out side, the positive current collector and the negative current collector are uniformly distributed in a large area of the leading-out side, so that the stroke of electrons reaching the positive current collector and the stroke of electrons reaching the negative current collector can be shortened; the physical impedance of the sheet-shaped battery can be reduced, and the discharge efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage power technology, and more specifically, to a sheet battery and power supply device. Background Technology

[0002] The current collector is one of the components of a lithium-ion battery. It not only carries the active material, but also collects and outputs the current generated by the electrode active material, which helps to reduce the internal resistance of the lithium-ion battery and improve the battery's coulombic efficiency, cycle stability and rate performance.

[0003] In existing technologies, considering production efficiency and cost, current collectors are generally positioned close to the tabs of the same polarity; that is, the positive current collector is positioned close to the positive tab, and the negative current collector is positioned close to the negative tab. However, since the positive and negative tabs are generally spaced apart, there is a certain distance between them. This causes electrons near the negative tab to travel a longer distance in the electrolyte to reach the positive current collector, and electrons near the positive tab to travel a longer distance in the electrolyte to reach the negative current collector. This increases physical impedance and thus affects discharge efficiency. Utility Model Content

[0004] This application provides a sheet battery and a power supply device.

[0005] An embodiment of this application provides a sheet-like battery comprising a plurality of positive electrode sheets, a plurality of negative electrode sheets, a plurality of sets of positive current collectors, and a plurality of sets of negative current collectors. The plurality of positive electrode sheets and the plurality of negative electrode sheets are stacked alternately; each set of positive current collectors includes a plurality of positive current collectors connected to the lead-out side of a corresponding positive electrode sheet, the span of the plurality of positive current collectors being greater than 50% of the length of the lead-out side; each set of negative current collectors includes a plurality of negative current collectors connected to the lead-out side of a corresponding negative electrode sheet, the span of the plurality of negative current collectors being greater than 50% of the length of the lead-out side.

[0006] Thus, both the positive and negative current collectors are distributed over most of the lead-out side. Therefore, compared to the prior art sheet batteries where the positive and negative current collectors are only distributed over a small portion of the lead-out side, the sheet battery of this application can shorten the path of electrons to the positive current collector and the path of electrons to the negative current collector. According to the resistance law R=ρ*L / S, this can reduce the internal physical impedance of the sheet battery and improve the discharge efficiency.

[0007] In some embodiments, the positive current collector and the negative current collector have the same shape and size.

[0008] Thus, by setting the shape and size of the positive current collector and the negative current collector to be the same, the production efficiency of the current collector can be improved, the production cost of the current collector can be reduced, and the number of electrons near the positive electrode and the number of electrons near the negative electrode entering the positive current collector and the negative current collector can be the same, thereby improving the stability of the discharge.

[0009] In some embodiments, the thickness of the positive current collector accounts for 5% to 25% of the total thickness of the positive electrode, and the thickness of the negative current collector accounts for 5% to 25% of the total thickness of the negative electrode.

[0010] Thus, by making the thickness of the positive current collector 5% to 25% of the thickness of the positive electrode and the thickness of the negative current collector 5% to 25% of the thickness of the negative electrode, compared to the prior art where the thickness of the current collector needs to be large enough to ensure the electron flux, this application reduces the thickness of the current collector and increases the number of current collectors, thus ensuring the electron flux while avoiding the cost increase caused by increasing the number of current collectors.

[0011] In some embodiments, the thickness of the positive current collector accounts for 10% of the total thickness of the positive electrode, and the thickness of the negative current collector accounts for 10% of the total thickness of the negative electrode.

[0012] This ensures that the current can flow smoothly through the current collector during charging and discharging, reducing the resistance of the sheet battery and reducing the energy loss of the sheet battery.

[0013] In some embodiments, the positive current collector has a length of 3-30 mm along the lead-out side, and the negative current collector has a length of 3-30 mm along the lead-out side.

[0014] Thus, by setting the lengths of the positive current collector and the negative current collector to 3-30 mm, compared to the prior art where the current collector needs to be long enough to ensure electron flux, this application reduces the length of the current collector and increases the number of current collectors, thus ensuring electron flux while avoiding increased costs due to the increased number of current collectors.

[0015] In some embodiments, the positive current collector has a length of 3-5 mm along the lead-out side, and the negative current collector has a length of 3-5 mm along the lead-out side.

[0016] This helps to enhance the structural stability of the positive and negative current collectors, reduce deformation or damage to the current collectors, and improve the ease of connection between the positive and negative current collectors and external circuits.

[0017] In some implementations, the number of a group of positive current collectors is greater than 2, and the number of a group of negative current collectors is greater than 2.

[0018] Thus, by setting the number of positive and negative current collectors to be greater than 2, compared to the prior art which only sets one positive current collector around the positive electrode and one negative current collector around the negative electrode, setting more positive and negative current collectors can increase the path for electrons to enter the current collector, thereby improving the discharge efficiency.

[0019] In some embodiments, a plurality of positive current collectors of the same group are equidistantly distributed on the lead-out side, and / or a plurality of negative current collectors of the same group are equidistantly distributed on the lead-out side.

[0020] In this way, by distributing multiple positive current collectors and multiple negative current collectors equidistantly on the positive and negative electrodes, electrons along the length of the electrodes have a nearby current collector, thus eliminating the need for electrons near the positive and negative electrodes to travel a long distance to enter the current collector, reducing physical impedance and improving discharge efficiency.

[0021] In some embodiments, multiple positive current collectors from different groups are aligned and / or aligned on the lead-out side, and multiple negative current collectors from different groups are aligned on the lead-out side.

[0022] In this way, by aligning multiple positive current collectors from different groups on the positive electrode and multiple negative current collectors from different groups on the negative electrode, it is convenient to weld multiple positive current collectors and multiple negative current collectors, thereby improving the production efficiency of the sheet battery. No other connecting materials are needed to weld multiple positive current collectors, reducing production costs. Moreover, the alignment will not interfere with adjacent current collectors, avoiding short circuits.

[0023] In some embodiments, the lead-out side of the positive electrode and the lead-out side of the negative electrode are arranged facing the same side, and the plurality of positive current collectors and the plurality of negative current collectors corresponding to adjacent positive and negative electrodes are alternately distributed.

[0024] Thus, by aligning the lead-out sides of the positive and negative electrodes to the same side, space can be effectively utilized, reducing the overall size of the battery or energy storage device. By alternating the distribution of the positive and negative current collectors on the positive and negative electrodes, the space on the lead-out side can be fully utilized, and electrons from both the positive and negative electrodes can be uniformly introduced into the current collector.

[0025] In some embodiments, the gap between two adjacent positive current collectors and negative current collectors is 1-2 mm.

[0026] Thus, by setting the gap between the positive current collector and the negative current collector to 1-2 mm, it is possible to prevent the positive current collector and the negative current collector from coming into contact with each other and causing a short circuit.

[0027] In some embodiments, the total length of the gap accounts for 10%-20% of the length of the lead-out side.

[0028] Thus, by setting the total width of the gap to be 10%-20% of the length of the lead-out side, it is possible to arrange as many positive and negative current collectors as possible on the lead-out side, which in turn helps reduce the electron travel in the positive and negative electrodes, thereby reducing physical impedance and improving discharge efficiency.

[0029] In some embodiments, the sheet battery includes a positive tab, a negative tab, a first current collector and a second current collector, with a plurality of positive current collectors connected to the positive tab through the first current collector and a plurality of negative current collectors connected to the negative tab through the second current collector.

[0030] In this way, electrons in multiple positive current collectors can flow out from the positive electrode through the first current collector band, and electrons in multiple negative current collectors can flow out from the negative electrode through the second current collector band, which reduces the electron travel distance.

[0031] In some embodiments, the first current collector includes an aluminum current collector strip, and the second current collector includes a nickel current collector strip.

[0032] Thus, compared to the movement of electrons from the electrolyte to the tab, the impedance of the current collector aluminum strip and the current collector nickel strip is smaller, which reduces the distance electrons can travel.

[0033] In some embodiments, the sheet battery includes a sodium battery or a lithium battery.

[0034] Thus, by shortening the path of electrons in sodium or lithium batteries to the positive current collector and to the negative current collector, the internal physical impedance of sodium or lithium batteries can be reduced, thereby improving discharge efficiency.

[0035] The power supply device according to the embodiments of this application includes a housing and a sheet battery disposed within the housing as described in any of the above embodiments.

[0036] In some embodiments, the power supply device includes an emergency starter power supply, a car battery, a power tool, or an energy storage power source.

[0037] Additional aspects and advantages of embodiments of this application 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 embodiments of this application. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0039] Figure 1 This is a schematic diagram of the power supply device according to certain embodiments of this application;

[0040] Figure 2 This is a schematic diagram of the structure of a sheet battery according to certain embodiments of this application;

[0041] Figure 3 This is a front view schematic diagram of a sheet battery according to certain embodiments of this application;

[0042] Figure 4 This is a top view schematic diagram of a sheet battery according to certain embodiments of this application.

[0043] Explanation of key component symbols:

[0044] 100. Power supply equipment; 10. Sheet battery; 11. Positive electrode; 111. Positive current collector; 12. Negative electrode; 121. Negative current collector; 13. Separator; 14. Lead-out side; 15. Positive tab; 16. Negative tab; 17. First current collector band; 18. Second current collector band; 20. Casing. Detailed Implementation

[0045] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] This disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0049] Please see Figure 1 , Figure 2 and Figure 3 An embodiment of this application provides a sheet-like battery 10 comprising a plurality of positive electrode sheets 11, a plurality of negative electrode sheets 12, a plurality of positive current collectors 111, and a plurality of negative current collectors 121. The plurality of positive electrode sheets 11 and the plurality of negative electrode sheets 12 are stacked alternately, and the positive electrode sheets 11 and negative electrode sheets 12 include aligned lead-out sides 14. Each group of positive current collectors 111 includes a plurality of positive current collectors 111 connected to the lead-out side 14 corresponding to one positive electrode sheet 11, and the span of the plurality of positive current collectors 111 is greater than 50% of the length of the lead-out side 14. Each group of negative current collectors 121 includes a plurality of negative current collectors 121 connected to the lead-out side 14 corresponding to one negative electrode sheet 12, and the span of the plurality of negative current collectors 121 is greater than 50% of the length of the lead-out side 14.

[0050] Thus, the positive current collector 111 and the negative current collector 121 are both distributed in most of the lead-out side 14. Therefore, compared with the prior art sheet battery 10 where the positive current collector 111 and the negative current collector 121 are only distributed in a small part of the lead-out side 14, the sheet battery 10 of this application can shorten the path of electrons to the positive current collector 111 and the path to the negative current collector 121. According to the resistance law R=ρ*L / S, the physical impedance inside the sheet battery 10 can be reduced, and the discharge efficiency can be improved.

[0051] The sheet-shaped battery 10 can be used to provide current to a load, and the sheet-shaped battery 10 may include a secondary battery, such as a lithium battery or a sodium battery. The sheet-shaped battery 10 is manufactured using a stacking process, in which pre-made positive and negative electrode sheets 12 are alternately stacked with a separator 13 to form a battery cell.

[0052] The power supply device 100 includes a sheet battery 10 and a housing 20. The housing 20 encloses the sheet battery 10, providing protection and support. Thus, the power supply device 100 can be used to provide power to a load. Examples of power supply devices include emergency jump starters, automotive batteries, power tools, or energy storage devices.

[0053] Specifically, the sheet-like battery 10 includes a positive electrode 11, a negative electrode 12, a positive current collector 111, and a negative current collector 121. There can be multiple positive electrode 11s and negative electrode 12s, for example, 8 or 10. Multiple positive electrode 11s and multiple negative electrode 12s are stacked alternately, and adjacent positive electrode 11s and negative electrode 12s are separated by a separator 13 to prevent short circuits. The positive electrode 11 and negative electrode 12 also have unidirectional lead-out sides 14, which can serve as the sides from which current flows into and out of the positive electrode 11 and negative electrode 12.

[0054] The positive electrode 11 and the negative electrode 12 can serve as reaction carriers for electrochemical reactions to convert into electrical energy. Taking the sheet battery 10 as an example of a lithium-ion battery, the positive electrode 11 is made of materials such as lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, or ternary materials (such as lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide), and the negative electrode 12 can be made of materials such as graphite, silicon, and carbon. During the charging of a lithium-ion battery, the positive electrode 11 absorbs charge, causing lithium atoms to ionize into lithium ions and electrons. That is, lithium ions are deintercalated from the positive electrode 11, pass through the electrolyte and the separator 13, and then intercalate into the negative electrode 12. The negative electrode 12 is in a lithium-rich state and combines with electrons at the negative electrode 12 to form lithium atoms. During the discharging of a lithium-ion battery, the negative electrode 12 absorbs charge, causing lithium atoms to ionize into lithium ions and electrons. That is, lithium ions are deintercalated from the negative electrode 12, pass through the electrolyte and the separator 13, and then intercalate into the positive electrode 11. The positive electrode 11 is in a lithium-rich state and combines with electrons at the positive electrode 11 to form lithium atoms.

[0055] The current collector, as an important component of the sheet battery 10, includes a positive current collector 111 and a negative current collector 121. The positive current collector 111 and the negative current collector 121 can be used as carriers to output the current generated by the positive electrode 11 and the negative electrode 12 to the outside, or to input the external current to the positive electrode 11 and the negative electrode 12.

[0056] The positive current collector 111 can be made of aluminum foil, and the negative current collector 121 can be made of copper foil, or both the positive and negative current collectors 111 and 121 can be made of nickel foil. Aluminum foil has lower conductivity than copper foil, but it only requires half the mass of copper foil to deliver the same amount of power. Therefore, using aluminum foil as the positive current collector 111 helps improve the energy density of lithium-ion batteries. Furthermore, aluminum foil is cheaper than copper foil, reducing costs. During the charging or discharging process of a lithium-ion battery, a dense oxide film forms on the surface of the aluminum foil current collector, improving its corrosion resistance. Copper foil has higher conductivity, but it is easily oxidized at higher potentials; therefore, copper foil can be used as a low-potential negative current collector 121 material. Nickel foil is relatively inexpensive, reducing costs, and it has good conductivity and is stable in acidic and alkaline solutions. Therefore, nickel foil can be used as both a positive and negative current collector.

[0057] A set of positive current collectors 111 is welded to the lead-out side 14 of each positive electrode 11, and a set of negative current collectors 121 is welded to the lead-out side 14 of each negative electrode 12. The number of each set of positive current collectors 111 and each set of negative current collectors 121 can be multiple. For example, the number of each set of positive current collectors 111 can be 3, 4 or 5, and the number of each set of negative current collectors 121 can be 3, 4 or 5, etc.

[0058] The span of multiple positive current collectors 111 accounts for more than 50% of the length of the lead-out side 14. That is, in the length direction of the lead-out side 14 of the positive electrode 11, the span of the first positive current collector 111 and the last positive current collector needs to account for 50% of the length of the lead-out side 14 of the positive electrode 11. This makes it possible for electrons in the positive electrode 11 that are far away from the first positive current collector 111 to not need to move to the first positive current collector 111, thereby reducing the electron movement distance and reducing physical impedance.

[0059] The span of multiple negative current collectors 121 accounts for more than 50% of the length of the lead-out side 14. That is, in the length direction of the lead-out side 14 of the negative electrode 12, the span of the first negative current collector 121 and the last negative current collector needs to account for 50% of the length of the lead-out side 14 of the negative electrode 12. This allows electrons in the negative electrode 12 that are far away from the first negative current collector 121 to not need to move to the first negative current collector 121, thereby reducing the electron movement path and reducing physical impedance.

[0060] Please see Figure 3 In some embodiments, the positive current collector 111 and the negative current collector 121 have substantially the same shape and size.

[0061] Thus, by setting the shape and size of the positive current collector 111 and the negative current collector 121 to be the same, the production efficiency of the current collector can be improved, the production cost of the current collector can be reduced, and the number of electrons in the positive electrode 11 and the negative electrode 12 entering the positive current collector 111 and the negative current collector 121 can be the same, thereby improving the stability of the discharge.

[0062] Specifically, the positive current collector 111 and the negative current collector 121 can be cut using die-cutting methods, including metal die-cutting and laser die-cutting. When producing the positive current collector 111 and the negative current collector 121, the shapes and dimensions of the produced positive current collector 111 and negative current collector 121 need to be designed to be identical. That is, the same set of molds can be used to cut the positive current collector 111 and negative current collector 121, thus eliminating the need to design molds with different shapes and sizes for the positive current collector 111 and negative current collector 121, reducing production costs and improving production efficiency. For example, the shapes of the positive current collector 111 and negative current collector 121 can be cylindrical or prismatic, etc., and the length, width, and thickness of the molds used to cut the positive current collector 111 and negative current collector 121 are set to be the same.

[0063] Please see Figure 4 In some embodiments, the thickness of the positive current collector 111 accounts for 5% to 25% of the total thickness of the positive electrode 11, and the thickness of the negative current collector 121 accounts for 5% to 25% of the total thickness of the negative electrode 12.

[0064] Thus, by making the thickness of the positive current collector 111 account for 5% to 25% of the thickness of the positive electrode 11, and the thickness of the negative current collector 121 account for 5% to 25% of the thickness of the negative electrode 12, compared to the prior art where the thickness of the current collector needs to be large enough to ensure the electron flux, this application reduces the thickness of the current collector and increases the number of current collectors, thus ensuring the electron flux while avoiding the cost increase caused by increasing the number of current collectors.

[0065] When designing the molds for the positive current collector 111 and the negative current collector 121, the dimensions of the positive electrode 11 and the negative electrode 12 need to be considered, so as to ensure the electron flux while avoiding an increase in production costs due to increasing the number of positive current collectors 111 and negative current collectors 121.

[0066] Specifically, the thickness of the positive current collector 111 needs to be determined based on the thickness of the positive electrode 11, such that the thickness of the positive current collector 111 accounts for 5% to 25% of the total thickness of the positive electrode 11. The thickness of the negative current collector 121 needs to be determined based on the thickness of the negative electrode 12, such that the thickness of the negative current collector 121 accounts for 5% to 25% of the total thickness of the negative electrode 12. For example, if the thickness of the positive electrode 11 is 100 micrometers, then the thickness of the positive current collector 111 is 5 micrometers to 25 micrometers; if the thickness of the negative electrode 12 is 100 micrometers, then the thickness of the negative current collector 121 is 5 micrometers to 25 micrometers.

[0067] It should be noted that, based on the calculation of the total width of the positive electrode 11 and the negative electrode 12 being 90%, taking the calculation of the thickness of the positive current collector 111 as an example, a single positive electrode 11 accounts for 45%, two positive current collectors 111 each account for 22.5%, and ten positive current collectors 111 each account for 4.5%. Thus, the thickness of the positive current collector 111 accounts for 5% to 25% of the total thickness of the positive electrode 11.

[0068] In some embodiments, the thickness of the positive electrode 11 is between 50 and 100 micrometers, and preferably, the thickness of the corresponding positive current collector 111 is between 2.5 and 25 micrometers.

[0069] In some embodiments, the thickness of the negative electrode 12 is between 50 and 100 micrometers, and preferably, the thickness of the corresponding negative current collector 121 is between 2.5 and 25 micrometers.

[0070] Preferably, the thickness of the positive current collector 111 accounts for 10% of the total thickness of the positive electrode 11, and the thickness of the negative current collector 121 accounts for 10% of the total thickness of the negative electrode 12. In this way, it can be ensured that the current can pass smoothly through the positive current collector 111 and the negative current collector 121 during charging and discharging, thereby reducing the resistance of the sheet battery 10 and reducing the energy loss of the sheet battery 10.

[0071] Please see Figure 2 and Figure 3 In some embodiments, the positive current collector 111 has a length of 3-30 mm along the lead-out side 14, and the negative current collector 121 has a length of 3-30 mm along the lead-out side 14.

[0072] Thus, by setting the length of the positive current collector and the negative current collector 121 to 3-30 mm, compared to the prior art where the current collector needs to be long enough to ensure the electron flux, this application reduces the length of the current collector and increases the number of current collectors, thus ensuring the electron flux while avoiding the cost increase caused by increasing the number of current collectors.

[0073] When designing the molds for the positive current collector 111 and the negative current collector 121, the dimensions of the positive electrode 11 and the negative electrode 12 need to be considered, so as to ensure the electron flux while avoiding an increase in production costs due to increasing the number of positive current collectors 111 and negative current collectors 121.

[0074] Specifically, the length of the produced positive current collector 111 needs to be determined based on the length of the lead-out side 14 of the positive electrode 11 and the number of positive current collectors 111, such that the length of the positive current collector 111 along the length direction of the lead-out side 14 is 3-30 mm. The length of the produced negative current collector 121 needs to be determined based on the thickness of the negative electrode 12, such that the length of the negative current collector 121 along the length direction of the lead-out side 14 is 3-30 mm. It should be noted that the more positive current collectors 111 and negative current collectors 121 there are, the smaller their dimensions along the length direction of the lead-out side 14 will be.

[0075] Preferably, the positive current collector 111 has a length of 3-5 mm along the lead-out side 14, and the negative current collector 121 has a length of 3-5 mm along the lead-out side 14. This helps to enhance the structural stability of the positive current collector 111 and the negative current collector 121, reduce deformation or damage to the positive current collector 111 and the negative current collector 121, and improve the ease of connection between the positive current collector 111 and the negative current collector 121 and external circuits.

[0076] Please refer to it again. Figure 2 and Figure 3 In some embodiments, the number of a group of positive current collectors 111 is greater than 2, and the number of a group of negative current collectors 121 is greater than 2.

[0077] Thus, by setting the number of positive current collectors 111 and negative current collectors 121 to be greater than 2, compared to the prior art where only one positive current collector 111 is set around the positive electrode 15 and only one negative current collector 121 is set around the negative electrode 16, setting more positive current collectors 111 and negative current collectors 121 can increase the path for electrons to enter the current collector, thereby improving the discharge efficiency.

[0078] Specifically, the sheet battery 10 needs to achieve high-rate discharge, which requires reducing the internal physical impedance of the sheet battery 10. By setting more than 2 positive current collectors 111 on a single positive electrode 11 and more than 2 negative current collectors 121 on a single negative electrode 12, the path for electrons in the positive electrode 11 to enter the positive current collector 111 is increased, and the path for electrons in the negative electrode 12 to enter the negative current collector 121 is increased.

[0079] Compared to having only one or two positive current collectors 111 on a single positive electrode 11 and only one or two negative current collectors 121 on a single negative electrode 12, the path of electrons on the positive electrode 11 into the positive current collector 111 is shortened, and the path of electrons on the negative electrode 12 into the negative current collector 121 is shortened. Thus, according to the law of resistance, the physical impedance inside the sheet battery 10 can be reduced.

[0080] Please see Figure 2 and Figure 3 In some embodiments, multiple positive current collectors 111 of the same group of positive current collectors 111 are equidistantly distributed on the lead-out side 14, and multiple negative current collectors 121 of the same group of negative current collectors 121 are equidistantly distributed on the lead-out side 14.

[0081] In this way, by distributing multiple positive current collectors 111 and multiple negative current collectors 121 at equal intervals on the positive electrode 11 and the negative electrode 12, electrons in the length direction of the electrode have close current collectors, so that electrons do not need to travel a long distance to enter the current collector, reducing physical impedance and improving discharge efficiency.

[0082] Specifically, multiple positive current collectors 111, welded to a single positive electrode 11, are evenly spaced on the lead-out side 14. For example, if a group of positive current collectors 111 contains eight positive current collectors 111, then the eight positive current collectors 111 can divide the lead-out side 14 on the positive electrode 11 into nine equal parts. Thus, electrons at different positions on the positive electrode 11 are all close to the positive current collectors 111 along the length of the positive electrode 11.

[0083] Multiple negative current collectors 121, welded to a single negative electrode 12, are evenly distributed on the lead-out side 14. For example, if a group of negative current collectors 121 contains eight negative current collectors 121, then the eight negative current collectors 121 can divide the lead-out side 14 on the negative electrode 12 into nine equal parts. Thus, electrons at different positions on the negative electrode 12 are all close to the negative current collectors 121 along the length of the negative electrode 12.

[0084] Please see Figures 1 to 4 In some embodiments, multiple positive current collectors 111 from different groups are aligned on the lead-out side 14, and multiple negative current collectors 121 from different groups are aligned on the lead-out side 14.

[0085] In this way, by aligning multiple positive current collectors 111 in different groups on the positive electrode 11 and multiple negative current collectors 121 in different groups on the negative electrode 12, it is convenient to weld multiple positive current collectors 111 and multiple negative current collectors 121, thereby improving the production efficiency of the sheet battery 10. No other connecting materials are needed to weld multiple positive current collectors 111, reducing production costs. Moreover, the alignment will not interfere with adjacent current collectors, avoiding short circuits.

[0086] Specifically, multiple sets of positive current collectors 111 are welded onto multiple positive electrode plates 11. The multiple positive electrode plates 11 are aligned, so that when connecting multiple positive electrode plates 11 via multiple positive current collectors 111, only the aligned positive current collectors 111 need to be welded, eliminating the need for intermediate materials between the positive current collectors 111 as a connection carrier. This improves welding efficiency and saves costs.

[0087] Multiple negative electrode plates 12 are welded with multiple sets of negative current collectors 121. The multiple negative electrode plates 12 are aligned, so by aligning the multiple sets of negative current collectors 121 on the lead-out side 14, when connecting the multiple negative electrode plates 12 via the multiple negative current collectors 121, only the aligned negative current collectors 121 need to be welded, eliminating the need for intermediate materials as connecting carriers between the negative current collectors 121, thus improving welding efficiency and saving costs. Furthermore, by aligning the multiple positive current collectors 111 and the multiple negative current collectors 121 on the lead-out side 14, interference between adjacent positive current collectors 111 and negative current collectors 121, preventing short circuits, is avoided.

[0088] Please see Figure 3 and Figure 4 In some embodiments, multiple positive current collectors 111 and multiple negative current collectors 121 corresponding to adjacent positive electrode plates 11 and negative electrode plates 12 are alternately distributed.

[0089] In this way, by alternately distributing the positive electrode fluid and the negative current collector 121 on the positive electrode plate 11 and the negative electrode plate 12, the space on the lead-out side 14 can be fully utilized, and the electrons in the positive electrode plate 11 and the negative electrode plate 12 can be uniformly introduced into the current collector.

[0090] Specifically, multiple positive current collectors 111 and multiple negative current collectors 121 are welded alternately on adjacent positive electrode plates 11 and negative electrode plates 12. That is, between two adjacent positive current collectors 111 on a single positive electrode plate 11, there is a negative current collector 121 on the adjacent negative electrode plate 12, and between two adjacent negative current collectors 121 on a single negative electrode plate 12, there is a positive current collector 111 on the adjacent positive electrode plate 11. Thus, the space on the lead-out side 14 can be fully utilized without interference between the positive current collectors 111 and the negative current collectors 121.

[0091] Please see Figure 3 In some embodiments, the gap between two adjacent positive current collectors 111 and negative current collectors 121 is 1-2 mm.

[0092] Thus, by setting the gap between the positive current collector 111 and the negative current collector 121 to 1-2 mm, it is possible to prevent the positive current collector and the negative current collector 121 from coming into contact with each other and causing a short circuit.

[0093] The interval between the positive current collector 111 and the negative current collector 121 is [missing information]. Figure 3 The projected distance between two adjacent positive current collectors 111 and negative current collectors 121 in the direction of the front view of the schematic diagram.

[0094] Specifically, the gap between two adjacent positive current collectors 111 and negative current collectors 121 can be set to 1 mm or 2 mm, and the total length of the gap is 10% or 20% of the length of the lead-out side 14. This allows for the arrangement of as many positive current collectors 111 and negative current collectors 121 as possible on the lead-out side 14 while avoiding contact between them. This reduces the path of electrons from the positive electrode 11 and negative electrode 12 into the positive current collectors 111 and negative current collectors 121, thereby reducing physical impedance and improving discharge efficiency.

[0095] Please see Figure 2 and Figure 3 In some embodiments, the sheet battery 10 includes a positive tab 15, a negative tab 16, a first current collector 17 and a second current collector 18, a plurality of positive current collectors 111 are connected to the positive tab 15 through the first current collector 17, and a plurality of negative current collectors 121 are connected to the negative tab 16 through the second current collector 18.

[0096] In this way, electrons in multiple positive current collectors 111 can flow out of the positive electrode tab 15 through the first current collector 17, and electrons in multiple negative current collectors 121 can flow out of the negative electrode tab 16 through the second current collector 18. Compared with the movement of electrons from the electrolyte to the electrode tab, the impedance of the first current collector 17 and the second current collector 18 is smaller, which reduces the movement distance of electrons.

[0097] Specifically, the sheet battery 10 also includes a positive electrode tab 15 and a negative electrode tab 16. The sheet battery 10 includes positive and negative electrodes, with the positive electrode tab 15 corresponding to the positive electrode and the negative electrode tab 16 corresponding to the negative electrode. The positive electrode tab 15 and the negative electrode tab 16 can be metallic conductors that draw electrons from the positive electrode 11 and the negative electrode 12. The positive electrode tab 15 can be made of aluminum, and the negative electrode tab 16 can be made of nickel or copper plated with nickel. The positive electrode tab 15 and the negative electrode tab 16 are respectively disposed at both ends of the lead-out side 14 and can connect to multiple sets of positive current collectors 111 and multiple sets of negative current collectors 121.

[0098] The sheet-like battery 10 also includes a first current collector 17 and a second current collector 18. The impedance of the first current collector 17 and the second current collector 18 is lower than that of the electrolyte in the positive electrode 11 and the negative electrode 12. Multiple positive current collectors 111 and positive tabs 15 can be welded to the first current collector 17, allowing the multiple positive current collectors 111 to connect to the positive tabs 15 through the first current collector 17, thereby enabling electrons in the positive electrode 11 to flow into the positive tabs 15 through the positive current collectors 111 and the first current collector 17.

[0099] Multiple negative current collectors 121 and negative electrode tabs 16 can be welded to the second current collector band 18, so that multiple negative current collectors 121 can be connected to the negative electrode tabs 16 through the second current collector band 18, thereby allowing electrons in the negative electrode 12 to flow into the negative electrode tabs 16 through the negative current collectors 121 and the second current collector band 18.

[0100] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0101] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sheet-shaped battery, characterized in that, The sheet-shaped battery includes: Multiple positive electrode plates; Multiple negative electrode plates, wherein the multiple positive electrode plates and the multiple negative electrode plates are stacked alternately; Multiple sets of positive current collectors, each set of positive current collectors including multiple positive current collectors connected to the lead-out side of a corresponding positive electrode, wherein the span of the multiple positive current collectors accounts for more than 50% of the length of the lead-out side; Multiple sets of negative current collectors, each set of negative current collectors including multiple negative current collectors connected to the lead side of a corresponding negative electrode, wherein the span of the multiple negative current collectors accounts for more than 50% of the length of the lead side.

2. The sheet-shaped battery according to claim 1, characterized in that, The positive current collector and the negative current collector have the same shape and size.

3. The sheet-shaped battery according to claim 2, characterized in that, The thickness of the positive current collector accounts for 5% to 25% of the total thickness of the positive electrode, and the thickness of the negative current collector accounts for 5% to 25% of the total thickness of the negative electrode.

4. The sheet-shaped battery according to claim 3, characterized in that, The thickness of the positive current collector accounts for 10% of the total thickness of the positive electrode, and the thickness of the negative current collector accounts for 10% of the total thickness of the negative electrode.

5. The sheet-shaped battery according to claim 2, characterized in that, The positive current collector has a length of 3-30 mm along the lead-out side, and the negative current collector has a length of 3-30 mm along the lead-out side.

6. The sheet-shaped battery according to claim 2, characterized in that, The positive current collector has a length of 3-5 mm along the lead-out side, and the negative current collector has a length of 3-5 mm along the lead-out side.

7. The sheet-shaped battery according to claim 1, characterized in that, The number of positive current collectors in one group is greater than 2, and the number of negative current collectors in one group is greater than 2.

8. The sheet-shaped battery according to claim 7, characterized in that, Multiple positive current collectors of the same group are equidistantly distributed on the lead-out side, and / or multiple negative current collectors of the same group are equidistantly distributed on the lead-out side.

9. The sheet-shaped battery according to claim 1, characterized in that, Multiple positive current collectors from different groups are aligned on the lead-out side, and / or multiple negative current collectors from different groups are aligned on the lead-out side.

10. The sheet-shaped battery according to claim 1, characterized in that, The lead-out side of the positive electrode and the lead-out side of the negative electrode are arranged facing the same side, and the plurality of positive current collectors and the plurality of negative current collectors corresponding to adjacent positive and negative electrodes are alternately distributed.

11. The sheet-shaped battery according to claim 1 or 9, characterized in that, The gap between adjacent positive current collectors and negative current collectors is 1-2 mm.

12. The sheet-shaped battery according to claim 11, characterized in that, The total length of the gap accounts for 10%-20% of the length of the lead-out side.

13. The sheet-shaped battery according to claim 1, characterized in that, The sheet-shaped battery includes a positive electrode tab, a negative electrode tab, a first current collector strip, and a second current collector strip. A plurality of positive current collectors are connected to the positive electrode tab through the first current collector strip, and a plurality of negative current collectors are connected to the negative electrode tab through the second current collector strip.

14. The sheet-shaped battery according to claim 13, characterized in that, The first current collector includes an aluminum current collector strip, and the second current collector includes a nickel current collector strip.

15. The sheet-shaped battery according to claim 1, characterized in that, The sheet-shaped battery includes sodium batteries or lithium batteries.

16. A power supply device, characterized in that, The power supply device includes a housing and a sheet battery as described in any one of claims 1-15 disposed within the housing.

17. The power supply device according to claim 16, characterized in that, The power supply equipment includes emergency start-up power supplies, automotive batteries, power tools, or energy storage power supplies.

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