Battery and battery pack

Abstract

The utility model relates to battery technical field discloses battery and battery package, connect setting through a plurality of hot melt area including: insulating film and bottom supporting plate, the length of bottom supporting plate is L, the setting number of hot melt area is a on the same straight line along the length direction of bottom supporting plate, the width of bottom supporting plate is W, the setting number of hot melt area is b on the same straight line along the width direction of bottom supporting plate, in L <=220mm range, the value of a satisfies 2 <= a <= 6, in L >220mm range, the value of a satisfies 4 <= a <=10, in W <=35mm range, the value of b satisfies 1 <= b <=3, in W >35mm range, the value of b satisfies 2 <= b <=5, the utility model can make the number of hot melt area according to the size of bottom supporting plate and set specifically, guarantee the fastness of the connection of bottom supporting plate and insulating film while reducing the processing difficulty, avoid the risk of causing insulation bad or pole knock injury risk caused by the separation of bottom supporting plate and insulating film.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries and battery packs. Background Technology

[0002] The insulating film, also known as Mylar film, is soft and flexible. In lithium-ion batteries, it is used to coat the battery cells, preventing the separator from being scratched by the aluminum casing when the electrode assembly is installed, and also providing insulation. The base plate mainly supports the bottom of the electrode assembly, protecting the electrode assembly from interference and damage to the inner wall of the casing. In current technology, a hot-melt process is usually used to connect and fix the insulating film and the base plate. However, the size of the base plate varies for different battery models, leading to a risk of detachment between the base plate and the insulating film, causing poor insulation or damage to the electrode assembly. Utility Model Content

[0003] In view of this, the present invention provides a battery and battery pack to solve the problem in the prior art where the bottom plate and insulating film are at risk of detachment, which may lead to poor insulation or damage to the electrode assembly.

[0004] In a first aspect, this utility model provides a battery, comprising: an electrode assembly; an insulating film covering at least one side of the electrode assembly; and a base plate disposed on the side of the insulating film away from the electrode assembly, wherein the insulating film and the base plate are connected by a plurality of heat-fused regions; the base plate has a length L, and the number of heat-fused regions arranged along the same straight line along the length direction of the base plate is a; the base plate has a width W, and the number of heat-fused regions arranged along the same straight line along the width direction of the base plate is b; in the range of L≤220mm, the value of a satisfies 2≤a≤6; in the range of L>220mm, the value of a satisfies 4≤a≤10; in the range of W≤35mm, the value of b satisfies 1≤b≤3; and in the range of W>35mm, the value of b satisfies 2≤b≤5.

[0005] Beneficial effects: The number of hot-melt areas along the length of the base plate is limited according to its different lengths, and the number of hot-melt areas along the width of the base plate is limited according to its different widths. Therefore, the number of hot-melt areas can be specifically set according to the size of the base plate, which reduces the processing difficulty while ensuring the firmness of the connection between the base plate and the insulating film, and avoids the risk of poor insulation or damage to the pole due to the detachment of the base plate and the insulating film.

[0006] In one optional implementation, the value of a satisfies 2≤a≤4 within the range of L≤130mm; and the value of a satisfies 3≤a≤6 within the range of 130mm<L≤220mm.

[0007] In one optional implementation, the value of a satisfies 4 ≤ a ≤ 7 within the range of 220 mm < L ≤ 300 mm; and the value of a satisfies 5 ≤ ​​a ≤ 10 within the range of L > 300 mm.

[0008] In one alternative embodiment, on a projection plane perpendicular to the thickness direction of the base plate, the orthographic projection shape of a plurality of the hot-melt regions includes at least one of the following shapes: strip, square, L-shaped, T-shaped, cross-shaped, X-shaped, circle, triangle, oblong, ellipse, polygon, and rhombus.

[0009] Beneficial effects: The shape of the hot-melt zone can be selected according to the actual situation, improving the flexibility of the connection between the base plate and the insulating film.

[0010] In one alternative embodiment, on a projection plane perpendicular to the thickness direction of the base plate, the orthographic projection of a single hot-melt region is an elongated strip that extends along the width direction of the base plate, with at least one hot-melt region provided at each of the opposite ends of the base plate along its length direction.

[0011] Beneficial effects: The elongated hot-melt area extends along the width of the base plate, thus allowing only one hot-melt area to be set along the width of the base plate. This also enables effective fixing of the base plate and the insulating film along the width, and at least at both ends of the base plate along the length of the base plate to the insulating film, improving the connection stability between the base plate and the insulating film.

[0012] In one optional embodiment, on a projection plane perpendicular to the thickness direction of the base plate, the orthographic projection shapes of a plurality of hot-melt regions include a first shape and a second shape. The hot-melt regions of the first shape are located at the middle position of the base plate along the length and width directions, and the hot-melt regions of the second shape are located at the four corners of the base plate. The first shape includes any one of a strip shape, a cross shape, and an oblong shape, and the second shape includes any one of a square shape, a circle shape, and a triangle shape.

[0013] Beneficial effects: Hot-melt zones are set in the middle and four corners of the base plate, making the connection between the base plate and the insulating film more secure. In addition, the shape of the hot-melt zone is set according to different positions, which improves the compatibility between the hot-melt zone and the base plate.

[0014] In one optional embodiment, on a projection plane perpendicular to the thickness direction of the base plate, the orthographic projection shapes of a plurality of hot-melt regions include L-shapes and T-shapes. The L-shaped hot-melt regions are located at the four corners of the base plate, and at least one T-shaped hot-melt region is provided between two hot-melt regions along the length direction of the base plate.

[0015] Beneficial effects: Multiple heat-fusion zones are set along the two long sides of the base plate, making the connection between the base plate and the insulating film more secure. Furthermore, the shape of the heat-fusion zones is set according to different positions, improving the compatibility between the heat-fusion zones and the base plate.

[0016] In one optional embodiment, the length of the base plate is L and the width of the base plate is W, satisfying 100mm≤L≤500mm and 10.5mm≤W≤80mm.

[0017] In one optional embodiment, the base plate has a through hole that extends along the thickness direction, and the orthographic projection of the hot-melt area and the orthographic projection of the through hole do not overlap on the projection plane perpendicular to the thickness direction of the base plate.

[0018] Beneficial effect: The hot-melt area should be avoided at the opening position to prevent blockage of the through hole and affect its performance.

[0019] Secondly, this utility model also provides a battery pack, comprising a plurality of the aforementioned batteries. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of one arrangement of the hot-melt region in a first embodiment of the present utility model. Figure 2 This is a structural schematic diagram of another arrangement of the hot-melt region in a first embodiment of the present utility model. Figure 3 This is a structural schematic diagram of another arrangement of the hot-melt region in the first embodiment of the present utility model. Figure 4 This is a structural schematic diagram of one arrangement of the hot-melt region in a second embodiment of the present utility model. Figure 5 This is a structural schematic diagram of another arrangement of the hot-melt region in a second embodiment of the present utility model. Figure 6 This is a structural schematic diagram of another arrangement of the hot-melt region in a second embodiment of the present utility model. Figure 7 This is a schematic diagram of the third embodiment of the hot-melt region of this utility model.

[0022] Explanation of reference numerals in the attached figures: 1. Insulating film; 2. Base plate; 21. Through hole; 3. Hot melt area; 4. First shape; 5. Second shape. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a battery is provided, comprising: an electrode assembly; an insulating film 1 covering at least one side of the electrode assembly; and a base plate 2 disposed on the side of the insulating film 1 away from the electrode assembly. The insulating film 1 and the base plate 2 are connected by a plurality of heat-fused regions 3. The length of the base plate 2 is L, the number of heat-fused regions 3 disposed along the same straight line along the length direction of the base plate 2 is a, the width of the base plate 2 is W, and the number of heat-fused regions 3 disposed along the same straight line along the width direction of the base plate 2 is b. In the range of L≤220mm, the value of a satisfies 2≤a≤6; in the range of L>220mm, the value of a satisfies 4≤a≤10; in the range of W≤35mm, the value of b satisfies 1≤b≤3; and in the range of W>35mm, the value of b satisfies 2≤b≤5.

[0026] Using the battery of this embodiment, the number of hot-melt areas 3 along the length direction of the base plate 2 is limited according to the different lengths of the base plate 2, and the number of hot-melt areas 3 along the width direction of the base plate 2 is limited according to the different widths of the base plate 2. Therefore, the number of hot-melt areas 3 can be specifically set according to the size of the base plate 2, which reduces the processing difficulty while ensuring the firm connection between the base plate 2 and the insulating film 1, and avoids the risk of poor insulation or damage to the terminal due to the detachment of the base plate 2 and the insulating film 1.

[0027] It is worth noting that the battery cell also includes a casing, with the electrode assembly, insulating film 1, and base plate 2 all housed within the casing. The insulating film 1 and base plate 2 inside the battery cell serve as insulation protection between the electrode assembly and the casing, preventing the charged electrode assembly from directly contacting the inner wall of the casing and causing internal short-circuit corrosion. Specifically, for the electrode assembly of a square battery cell, the insulating film 1 primarily wraps around the bottom and four sides of the electrode assembly to form an insulating protective layer. The base plate 2 supports the bottom of the electrode assembly, meaning it is located on the side of the insulating film 1 on the bottom of the electrode assembly, away from the electrode assembly. Furthermore, a hot-melt process is used to connect and fix the insulating film 1 and the base plate 2, preventing the risk of insulation failure between the casing and the bottom of the electrode assembly inside the battery cell due to the peeling of the base plate 2 and the insulating film 1. However, if the number of hot-melt zones 3 is too small along the length and / or width of the base plate 2, the connection between the base plate 2 and the insulating film 1 cannot be guaranteed, and the base plate 2 and the insulating film 1 are prone to detachment. If the number of hot-melt zones 3 is too large, the hot-melt process will become complicated, the processing difficulty will increase, and the production efficiency will be affected.

[0028] Therefore, in this embodiment, an appropriate number of hot melt areas 3 are set according to different base plate 2 lengths and widths, which can ensure the connection between the base plate 2 and the insulating film 1, and avoid the processing technology being too complicated.

[0029] For example, please see Figure 1 The number of hot-melt zones 3 along the same straight line along the length of the base plate 2 is a=2; please refer to Figure 2 The number of hot-melt zones 3 along the same straight line along the length of the base plate 2 is a=3; please refer to Figure 4 The number of hot-melt zones 3 along the same straight line along the length of the base plate 2 is a=3; please refer to Figure 7 The number of hot-melt zones 3 along the same straight line along the length of the base plate 2 is a=3. Please refer to [link / reference]. Figure 1 The number of hot-melt zones 3 along the same straight line in the width direction of the base plate 2 is b=1; please refer to Figure 2 The number of hot-melt zones 3 along the same straight line in the width direction of the base plate 2 is b=1; please refer to Figure 4 The number of hot-melt zones 3 along the same straight line in the width direction of the base plate 2 is b=3; please refer to Figure 7 The number of hot-melt zones 3 set along the same straight line in the width direction of the bottom support plate 2 is b=2.

[0030] Furthermore, in one embodiment, the value of a satisfies 2≤a≤4 within the range of L≤130mm; and the value of a satisfies 3≤a≤6 within the range of 130mm<L≤220mm.

[0031] Furthermore, in one embodiment, within the range of 220mm < L ≤ 300mm, the value of a satisfies 4 ≤ a ≤ 7; within the range of L > 300mm, the value of a satisfies 5 ≤ ​​a ≤ 10.

[0032] It is worth noting that both a and b are positive integers.

[0033] In one embodiment, such as Figures 1 to 7 As shown, on the projection plane perpendicular to the thickness direction of the base plate 2, the orthographic projection shapes of several hot-melt regions 3 include at least one of the following shapes: strip, square, L-shaped, T-shaped, cross-shaped, X-shaped, circular, triangular, oblong, elliptical, polygonal, and rhomboid. This arrangement allows for the selection of the shape of the hot-melt regions 3 according to actual conditions, improving the flexibility of the connection between the base plate 2 and the insulating film 1.

[0034] It is worth noting that the orthographic projection shapes of several hot-melt regions 3 can be the same or different; they can be partially the same or completely different. The specific settings can be made according to the actual situation.

[0035] Of course, in other alternative embodiments, the orthographic shape of the hot-melt region 3 on the projection plane perpendicular to the thickness direction of the base plate 2 can also be other regular or irregular shapes.

[0036] The following describes in detail various implementation methods for the hot melt zone 3 of different shapes.

[0037] In the first implementation, such as Figures 1 to 3 As shown, on the projection plane perpendicular to the thickness direction of the base plate 2, the orthographic projection of a single hot-melt area 3 is a strip shape, which extends along the width direction of the base plate 2, and at least one hot-melt area 3 is provided at each of the opposite ends along the length direction near the base plate 2.

[0038] This configuration allows the elongated hot-melt area 3 to extend along the width of the base plate 2, thus enabling only one hot-melt area 3 to be set along the width of the base plate 2 (which can be understood as a row of hot-melt areas 3 set along the length). It also enables effective fixing of the base plate 2 and the insulating film 1 along the width, and at least at both ends of the base plate 2 along the length of the insulating film 1 to be hot-melted and fixed, thereby improving the connection stability of the base plate 2 and the insulating film 1.

[0039] For details, please refer to Figure 1 Alternatively, only two heat-melting zones 3 can be provided. In this case, the two heat-melting zones 3 are located at opposite ends of the base plate 2 along its length. Please refer to [link / reference]. Figure 2 and Figure 3Alternatively, more hot-melt areas 3 can be set, such as three or four. In this case, a hot-melt area 3 is set at each of the two opposite ends along the length direction of the bottom support plate 2, and the remaining hot-melt areas 3 are set at intervals between the two hot-melt areas 3 at the ends along the length direction of the bottom support plate 2. Furthermore, the hot-melt areas 3 between the two hot-melt areas 3 at the ends are set at equal intervals along the length direction of the bottom support plate 2.

[0040] For example, when three heat-melting regions 3 are spaced apart along the length of the base plate 2, one heat-melting region 3 is provided at each of the opposite ends of the base plate 2 along the length, and the remaining heat-melting region 3 is provided between the two heat-melting regions 3 located at the ends along the length of the base plate 2. When four heat-melting regions 3 are spaced apart along the length of the base plate 2, one heat-melting region 3 is provided at each of the opposite ends of the base plate 2 along the length, and the remaining two heat-melting regions 3 are sequentially spaced between the two heat-melting regions 3 located at the ends along the length of the base plate 2.

[0041] In the second implementation, such as Figures 4 to 6 As shown, on the projection plane perpendicular to the thickness direction of the base plate 2, the orthographic projection shapes of several hot-melt regions 3 include a first shape 4 and a second shape 5. The hot-melt regions 3 of the first shape 4 are located at the middle position of the base plate 2 along the length and width directions, and the hot-melt regions 3 of the second shape 5 are located at the four corners of the base plate 2. The first shape 4 includes any one of a strip shape, a cross shape, and an oblong shape, and the second shape 5 includes any one of a square shape, a circle shape, and a triangle shape.

[0042] With this configuration, hot-melt areas 3 are provided in the middle and at the four corners of the base plate 2, making the connection between the base plate 2 and the insulating film 1 more secure. Furthermore, the shape of the hot-melt areas 3 is set according to different positions, improving the compatibility between the hot-melt areas 3 and the base plate 2.

[0043] It should be noted that in the above technical solution, the "central position" is not the absolute midpoint, but a small area formed around the midpoint.

[0044] Specifically, in Figure 4 In the illustrated scheme, the first shape is a rectangle, and the second shape is a square. Figure 5 In the illustrated scheme, the first shape is an oblong, and the second shape is a circle. Figure 6 In the scheme shown, the first shape is a cross, and the second shape is a triangle.

[0045] In the third implementation, such as Figure 7As shown, on the projection plane perpendicular to the thickness direction of the base plate 2, the orthographic projection shapes of several hot-melt regions 3 include L-shape and T-shape. The L-shaped hot-melt regions 3 are located at the four corners of the base plate 2, and at least one T-shaped hot-melt region 3 is provided between two hot-melt regions 3 along the length direction of the base plate 2.

[0046] With this configuration, multiple hot-melt zones 3 are set along the two long sides of the base plate 2, making the connection between the base plate 2 and the insulating film 1 more secure. Furthermore, different shapes of the hot-melt zones 3 are set according to different positions, improving the adaptability of the hot-melt zones 3 to the base plate 2.

[0047] In one embodiment, such as Figure 3 As shown, the length of the base plate 2 is L, and the width of the base plate 2 is W, satisfying 100mm≤L≤500mm and 10.5mm≤W≤80mm.

[0048] It is worth noting that in this embodiment, the base plate 2 is a square plate, that is, on the projection plane perpendicular to the thickness direction of the base plate 2, the orthographic projection of the base plate 2 is a square (the four corners can be rounded), the length of the square is L, and the width of the square is W.

[0049] Optionally, L can be any value among 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, and 500mm, or a value between any two of these values.

[0050] Optionally, W can be any value from 10.5mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, or a value between any two of these values.

[0051] In one embodiment, such as Figures 1 to 7 As shown, a through hole 21 is provided on the base plate 2 along the thickness direction. On the projection plane perpendicular to the thickness direction of the base plate 2, the orthographic projection of the hot-melt area 3 and the orthographic projection of the through hole 21 do not overlap. The hot-melt area 3 needs to avoid the opening position to prevent the through hole 21 from being blocked and affecting its performance.

[0052] It is worth noting that the through hole 21 on the base plate 2 can be a wetting hole for electrolyte or a positioning hole during the process of wrapping the electrode assembly. If the hot-melting area 3 overlaps with the through hole 21, it is easy to cause blockage of the wetting hole or the positioning hole, resulting in problems such as poor wetting or assembly misalignment.

[0053] According to an embodiment of the present invention, another aspect provides a battery pack comprising a plurality of the aforementioned batteries.

[0054] In this application, "several" and "multiple" refer to two or more (including two). Similarly, "several groups" and "multiple groups" refer to two or more (including two groups), and "several pieces" and "multiple pieces" refer to two or more (including two pieces).

[0055] The battery mentioned in the embodiments of this application can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can include battery cells, battery modules, or battery packs.

[0056] A battery cell is the smallest unit that makes up a battery, and it can independently perform the functions of charging and discharging. A battery cell can be cylindrical, cuboid, or other shapes, and the embodiments of this application are not limited to this.

[0057] When there are multiple battery cells, they are connected in series, parallel, or mixed via a busbar. In some embodiments, the battery can be a battery module; when there are multiple battery cells, they are arranged and fixed to form a battery module. In some embodiments, the battery can be a battery pack, which includes a housing and battery cells, with the battery cells or battery modules housed within the housing. In some embodiments, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least part of the vehicle's floor, or a portion of the housing can be at least part of the vehicle's crossbeams and longitudinal beams.

[0058] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0059] In some embodiments, individual battery cells can be assembled into a battery module, and the number of individual battery cells contained in the battery module can be multiple, the specific number of which can be adjusted according to the application and capacity of the battery module.

[0060] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0061] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0062] In some implementations, the battery cell in this application embodiment can be a metal battery. Specifically, the metal battery may include lithium metal secondary batteries, sodium metal batteries, or magnesium metal batteries, etc. This application embodiment does not limit this.

[0063] A single battery cell typically includes an electrode assembly (also known as an electrode group). The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0064] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0065] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0066] As an example, the positive electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0068] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0069] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0072] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0073] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0074] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0075] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0076] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0077] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0078] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc. The housing includes a shell and a cover plate.

[0079] The technical solutions described in the embodiments of this application are applicable to various battery-powered electrical devices.

[0080] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0081] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0082] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle, and the battery can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, the battery can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery's power supply to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In other embodiments of this application, the battery can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing gasoline or natural gas to provide driving force for the vehicle.

[0083] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: pole group; An insulating film (1) covers at least one side of the electrode assembly; A base plate (2) is disposed on the side of the insulating film (1) away from the electrode assembly. The insulating film (1) and the base plate (2) are connected by a plurality of hot-melt regions (3). The length of the base plate (2) is L, the number of hot-melt regions (3) along the same straight line along the length direction of the base plate (2) is a, the width of the base plate (2) is W, and the number of hot-melt regions (3) along the same straight line along the width direction of the base plate (2) is b. Within the range L≤220mm, the value of a satisfies 2≤a≤6; within the range L>220mm, the value of a satisfies 4≤a≤10. Within the range of W ≤ 35 mm, the value of b satisfies 1 ≤ b ≤ 3; within the range of W > 35 mm, the value of b satisfies 2 ≤ b ≤ 5.

2. The battery according to claim 1, characterized in that, Within the range of L≤130mm, the value of a satisfies 2≤a≤4; within the range of 130mm<L≤220mm, the value of a satisfies 3≤a≤6.

3. The battery according to claim 1, characterized in that, Within the range of 220mm < L ≤ 300mm, the value of a satisfies 4 ≤ a ≤ 7; within the range of L > 300mm, the value of a satisfies 5 ≤ ​​a ≤ 10.

4. The battery according to any one of claims 1 to 3, characterized in that, On the projection plane perpendicular to the thickness direction of the base plate (2), the orthographic projection shape of several hot-melt regions (3) includes at least one of the following shapes: strip, square, L-shaped, T-shaped, cross-shaped, X-shaped, circle, triangle, oval, ellipse, polygon, rhombus.

5. The battery according to any one of claims 1 to 3, characterized in that, On the projection plane perpendicular to the thickness direction of the base plate (2), the orthographic projection of a single hot melt region (3) is a strip shape, which extends along the width direction of the base plate (2), and at least one hot melt region (3) is provided at each of the opposite ends along the length direction of the base plate (2).

6. The battery according to any one of claims 1 to 3, characterized in that, On the projection plane perpendicular to the thickness direction of the base plate (2), the orthographic projection shapes of several hot-melt regions (3) include a first shape (4) and a second shape (5). The hot-melt regions (3) of the first shape (4) are located at the middle position of the base plate (2) along the length and width directions, and the hot-melt regions (3) of the second shape (5) are located at the four corners of the base plate (2). The first shape (4) includes any one of a strip shape, a cross shape, and an oblong shape, and the second shape (5) includes any one of a square shape, a circle shape, and a triangle shape.

7. The battery according to any one of claims 1 to 3, characterized in that, On the projection plane perpendicular to the thickness direction of the base plate (2), the orthographic projection shapes of several hot-melt regions (3) include L-shape and T-shape. The L-shaped hot-melt regions (3) are located at the four corners of the base plate (2), and at least one T-shaped hot-melt region (3) is provided between two hot-melt regions (3) along the length direction of the base plate (2).

8. The battery according to any one of claims 1 to 3, characterized in that, The length of the base plate (2) is L and the width of the base plate (2) is W, satisfying 100mm≤L≤500mm and 10.5mm≤W≤80mm.

9. The battery according to any one of claims 1 to 3, characterized in that, The base plate (2) has a through hole (21) that runs through the thickness direction. On the projection plane perpendicular to the thickness direction of the base plate (2), the orthographic projection of the hot melt area (3) and the orthographic projection of the through hole (21) do not overlap.

10. A battery pack, characterized in that, The battery includes any one of claims 1 to 9.

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