Battery monomer, battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, and discloses a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, an electrode assembly, a first tab and a first adhesive tape, and the shell is provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity, the electrode assembly is constructed into a laminated battery cell, the laminated battery cell comprises a plurality of positive plates and a plurality of negative plates, the positive plates and the negative plates are laminated along the thickness direction of the electrode assembly, and the electrode assembly is provided with a first side surface and a second side surface which are opposite to each other in the length direction; the first tab is arranged on the first side surface; the first adhesive tape is adhered to the first side face, the size of the first adhesive tape is D1 in the width direction of the electrode assembly, the size of the electrode assembly is L in the length direction of the electrode assembly, and L is larger than or equal to 250 mm, and D1 / L is larger than or equal to 0.0064 and smaller than or equal to 0.15. The reliability of the single battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] With the maturity and development of battery technology, batteries are being widely used in an increasing number of fields. Battery electrodes are a key component of battery performance; electrode assemblies are composed of multiple positive and negative electrodes stacked together. In electrode assemblies where multiple positive and negative electrodes are stacked, the electrode stacking is relatively loose, making them prone to wrinkling, which leads to a decrease in battery performance. Utility Model Content

[0003] This application provides a battery cell, a battery device, and an electrical appliance that improves the reliability of the battery cell.

[0004] To achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, an electrode assembly, a first tab, and a first adhesive tape. The casing has a receiving cavity; the electrode assembly is disposed within the receiving cavity, and the electrode assembly is constructed as a stacked cell, the stacked cell including a positive electrode and a negative electrode, the positive and negative electrode being multiple and stacked along the thickness direction of the electrode assembly, the electrode assembly having a first side and a second side opposite to each other in the length direction; the first tab is disposed on the first side; the first adhesive tape is adhered to the first side, the first adhesive tape having a size D1 along the width direction of the electrode assembly, and the electrode assembly having a size L along the length direction of the electrode assembly, satisfying: L≥250mm and 0.0064≤D1 / L≤0.15.

[0006] The first tape has a size of D1, and the electrode assembly has a size of L, satisfying: L≥250mm and 0.0064≤D1 / L≤0.15. On the one hand, the first tape can bond the electrode assembly together more firmly, enhance the stability of the electrode assembly, and reduce the probability of the positive or negative electrode sheet flipping and wrinkling. On the other hand, it can also keep the heat dissipation of the electrode assembly within a reasonable range, enabling the battery cell to operate at high efficiency, reducing the risk of battery cell overheating, and improving the stability and reliability of battery cell operation.

[0007] Secondly, embodiments of this application provide a battery device, including the battery cell described in any one of the embodiments of this application.

[0008] Thirdly, embodiments of this application provide an electrical device, including the electrical device described in any one of the embodiments of this application. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the specific embodiments of this application or 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 application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0011] Figure 2 A top view of the battery cell provided in an embodiment of this application;

[0012] Figure 3 The structure of the electrode assembly is shown;

[0013] Figure 4 for Figure 3 Top view;

[0014] Figure 5 for Figure 3 A bottom view;

[0015] Figure 6 for Figure 3 Side view;

[0016] Figure 7 This is a schematic diagram of the structure of the stacked battery cell provided in an embodiment of this application.

[0017] [Explanation of Labels in the Attached Image]

[0018] 100 for a single battery cell;

[0019] 110 outer casing; 111 outer casing; 112 cover plate;

[0020] Electrode assembly 120; laminated cell 130; positive electrode 131; negative electrode 132;

[0021] First electrode 140°; Second electrode 150°;

[0022] First tape 160; First part 161; Second part 162; Third part 163;

[0023] First side view 170; Second side view 171; Third side view 172; Fourth side view 173; Fifth side view 174; Sixth side view 175;

[0024] Injection hole 180;

[0025] Length direction X; width direction Y; thickness direction Z. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0028] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0033] In some embodiments, the battery can be a battery pack, which includes a battery housing and individual battery cells, with the individual battery cells or battery modules housed within the battery housing.

[0034] In some embodiments, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. 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.

[0035] With the maturity and development of battery technology, batteries have been widely used in more and more fields. As the core component of energy conversion and storage, the improvement of battery performance is directly related to the improvement of energy utilization efficiency and the achievement of sustainable development goals.

[0036] Electrode assemblies can be composed of stacked cells, which refer to multiple independent sheet-like positive and negative electrode sheets stacked together. The positive and negative electrode sheets are not arranged continuously. For example, in the stacking direction, the stacked cell includes a negative electrode sheet, a separator, a positive electrode sheet, a separator, a negative electrode sheet, a separator, and a positive electrode sheet arranged in sequence.

[0037] Each positive and negative electrode is independent, unlike wound cells. In stacked cells, adjacent positive or negative electrode sheets are stacked together. Compared to wound batteries, where the positive and negative electrode sheets are tightly packed, stacked cells have looser stacking of positive and negative electrode sheets, making them more prone to wrinkling and leading to reduced battery performance.

[0038] In view of this, this application proposes a battery cell, which includes a casing, an electrode assembly, a first tab, and a first adhesive tape. The casing has a receiving cavity; the electrode assembly is disposed in the receiving cavity, and the electrode assembly is constructed as a stacked cell, which includes a positive electrode and a negative electrode. There are multiple positive and negative electrode sheets stacked along the thickness direction of the electrode assembly. The electrode assembly has a first side and a second side opposite to each other in the length direction; the first tab is disposed on the first side; the first adhesive tape is adhered to the first side. The size of the first adhesive tape is D1 along the width direction of the electrode assembly, and the size of the electrode assembly is L along the length direction of the electrode assembly, satisfying: L≥250mm and 0.0064≤D1 / L≤0.15.

[0039] In the above scheme, the size of the first tape is D1, and the size of the electrode assembly is L, satisfying: L≥250mm and 0.0064≤D1 / L≤0.15. On the one hand, the first tape can more firmly bond the positive and negative electrode plates of the electrode assembly together, enhance the stability of the electrode assembly, and reduce the probability of the electrode plates flipping and wrinkling. On the other hand, it can also keep the heat dissipation of the electrode assembly within a reasonable range, so that the battery cell can operate with high efficiency, reduce the risk of battery cell overheating, and improve the stability and reliability of battery cell operation.

[0040] The battery disclosed in this application can be used, but is not limited to, in vehicles, and can also be used in other electrical devices with structural beams, wherein the battery is able to avoid the structural beams of other electrical devices.

[0041] The battery disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft that have longitudinal beams and are designed to allow the battery to avoid these structural beams. A power system for such an electrical device can be constructed using the battery disclosed in this application.

[0042] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, heavy trucks, buses, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0043] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0044] 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. The vehicle type can be a sedan, SUV, heavy truck, or bus, etc. A battery is installed inside the vehicle, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source, powering the vehicle's electrical system, such as meeting the power needs for starting, navigation, and operation.

[0045] The vehicle may also include a controller and a motor, with the controller controlling the battery to power the motor, for example, for the vehicle's power needs during starting, navigation, and driving.

[0046] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0047] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application; Figure 2 A top view of the battery cell provided in an embodiment of this application; Figure 3 The structure of the electrode assembly is shown; Figure 4 for Figure 3 Top view; Figure 5 for Figure 3 A bottom view; Figure 6 for Figure 3 Side view; Figure 7 This is a schematic diagram of the structure of the stacked battery cell provided in an embodiment of this application.

[0048] Please refer to Figures 1 to 7 In this embodiment, the battery cell 100 includes a housing 110, an electrode assembly 120, a first tab 140, and a first adhesive tape 160. The housing 110 has a receiving cavity. The electrode assembly 120 is disposed in the receiving cavity. The electrode assembly 120 is constructed as a stacked cell 130. The stacked cell 130 includes a positive electrode 131 and a negative electrode 132. Multiple positive electrode 131 and negative electrode 132 are stacked along the thickness direction Z of the electrode assembly 120. The electrode assembly 120 has a first side 170 and a second side 171 opposite each other in the length direction X; a first tab 140 is disposed on the first side 170; a first tape 160 is bonded to the first side 170, and the first tape 160 has a size D1 along the width direction Y of the electrode assembly 120, and the electrode assembly 120 has a size L along the length direction X of the electrode assembly 120, satisfying: L≥250mm and 0.0064≤D1 / L≤0.15.

[0049] The outer casing 110 is located on the outermost side of the battery cell 100. The outer casing 110 protects the electrode assembly 120 (laminated cell 130), the first tab 140 and the first adhesive tape 160 from external impurities, thereby improving the service life of the electrode assembly 120 (laminated cell 130), the first tab 140 and the first adhesive tape 160.

[0050] Along the length direction X of the electrode assembly 120, the electrode assembly 120 has a first side 170 and a second side 171 that are disposed opposite to each other, that is, along the length direction X of the electrode assembly 120, the projections of the first side 170 and the second side 171 coincide.

[0051] As a key component of a battery, the tabs primarily serve to connect the internal and external electrical components. Specifically, through their conductive metal strips, the tabs efficiently transfer current from inside the battery to the outside, or introduce external current into the battery, thus ensuring the smooth flow of electrical energy. This connection is fundamental to the normal operation of the battery.

[0052] The material of the tab can be the same as that of the current collector, specifically, it can be at least one of the following: silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium. The tab can be formed by cutting the current collector or it can be a separate metal part. The positive tab is electrically connected to the positive electrode plate, and the negative tab is electrically connected to the negative electrode plate.

[0053] The battery cell 100 also includes a first tab 140, which is disposed on the first side 170. The first tab 140 can connect multiple positive plates 131 or multiple negative plates 132 together. The first tab 140 can conduct the current of the battery cell 100 to an external power device and can conduct the electrical energy of the external power source into the battery cell 100.

[0054] The battery cell 100 also includes a first adhesive tape 160, which is used to bond the electrode assembly 120, improve the stability of the stacking of the positive electrode 131 and the negative electrode 132 in the stacked cell 130, reduce the risk of wrinkling of the positive electrode 131 or the negative electrode 132, and thus improve the stability of the electrode assembly 120.

[0055] For example, the size D1 of the first tape 160 can be 1-50mm, such as 1mm, 3mm, 5mm, 6mm, 7mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 25mm, 28mm, 30mm, 35mm, 40mm, 42mm, 44mm, 46mm, 48mm, 50mm.

[0056] The size L of the electrode assembly 120 is ≥250mm, for example, 250mm, 251mm, 260mm, 270mm, 280mm, 290mm, 300mm, 310mm, 320mm, 330mm, 340mm.

[0057] For example, D1 / L can be 0.0064, 0.0065, 0.008, 0.01, 0.012, 0.015, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.85, 0.9, 0.1, 0.11, 0.12, 0.13, 0.14, or 0.15.

[0058] To improve battery energy density, the length of electrode assembly 120 is increased. For the stacked cell 130, the end of electrode assembly 120 in the length direction X is in a relatively loose state. By comprehensively controlling the relationship between the size of the first adhesive tape 160 and the size of electrode assembly 120, the size of the first adhesive tape 160 is D1, and the size of electrode assembly 120 is L, satisfying: L≥250mm and 0.0064≤D1 / L≤0.15. On the one hand, this makes the positive electrode 131 and negative electrode 132 of electrode assembly 120 more firmly bonded together, enhances the stability of the stacked cell 130 structure, and reduces the probability of the positive electrode 131 and negative electrode 132 folding and wrinkling. On the other hand, it can also control the heat dissipation of stacked cell 130 within a reasonable range, enabling the battery cell 100 to operate at high efficiency, reducing the risk of overheating of battery cell 100, and improving the stability and reliability of battery cell 100 operation.

[0059] For example, the length L of the electrode assembly 120 can also be in the range of 300mm-800mm. This makes the positive electrode 131 and negative electrode 132 of the electrode assembly 120 more firmly bonded together, enhances the stability of the stacked cell 130 structure, and reduces the probability of the positive electrode 131 and negative electrode 132 folding and wrinkling. On the other hand, it can also control the heat dissipation of the stacked cell 130 within a reasonable range, so that the battery cell 100 can operate with high efficiency, reduce the risk of the battery cell 100 overheating, and improve the stability and reliability of the battery cell 100 operation.

[0060] In some embodiments, the electrode assembly 120 includes a separator. A separator is disposed between adjacent positive electrode plates 131 and negative electrode plates 132 along the thickness direction Z of the electrode assembly 120. The separator is used to prevent the two adjacent electrode plates from conducting electricity. Exemplarily, the separator can be constructed as an insulating sheet, and the material of the insulating sheet can be constructed as insulating materials such as polyethylene, polypropylene film, and polyester film. This application embodiment does not limit the specific material of the separator.

[0061] Along the thickness direction Z of the electrode assembly 120, a separator is also provided on the outer side of the outermost positive electrode 131 or negative electrode 132. That is to say, the outermost two layers of the electrode assembly 120 in the thickness direction Z are separators, thereby preventing the outermost positive electrode 131 or negative electrode 132 from conducting electricity, reducing the probability of leakage in the battery cell 100, and improving the stability of the operation of the battery cell 100.

[0062] Please refer to Figures 1 to 7 In this embodiment, a portion of the first tape 160 extends to the side of the electrode assembly 120 in the thickness direction Z.

[0063] Along the thickness direction Z of the electrode assembly 120, the electrode assembly 120 has two sides, namely the outer sides where the two outermost electrodes (positive electrode 131 or negative electrode 132) of the electrode assembly 120 are located. A portion of the first adhesive tape 160 extends to the side of the electrode assembly 120 in the thickness direction Z, that is, the length of the first adhesive tape 160 extends to the side of the electrode assembly 120 in the thickness direction Z.

[0064] The first tape 160 extends to the side of the electrode assembly 120 in the thickness direction Z, which can more comprehensively cover and fix the electrode assembly 120, further reducing the risk of the positive electrode 131 and negative electrode 132 of the electrode assembly 120 being flipped. It also expands the contact area between the first tape 160 and the electrode assembly 120, thereby improving the stability and reliability of the stacking and fixing of the positive electrode 131 and negative electrode 132. During the use of the battery cell 100, this enhanced fixing effect helps to prevent multiple stacked positive electrode 131 and negative electrode 132 from loosening or shifting due to external factors such as vibration and impact, thereby ensuring the normal operation and safety of the battery cell 100.

[0065] Please refer to Figures 1 to 7 In this embodiment, the electrode assembly 120 has a third side 172 and a fourth side 173. The third side 172 and the fourth side 173 are disposed opposite to each other along the thickness direction Z of the electrode assembly 120. The first adhesive tape 160 includes a first part 161, a second part 162 and a third part 163 connected in sequence. The first part 161 is bonded to the third side 172, the second part 162 is bonded to the first side 170, and the third part 163 is bonded to the fourth side 173.

[0066] Along the thickness direction Z of the electrode assembly 120, the electrode assembly 120 has a third side surface 172 and a fourth side surface 173 disposed opposite to each other, and the projections of the third side surface 172 and the fourth side surface 173 coincide along the thickness direction Z of the electrode assembly 120.

[0067] The first part 161 is bonded to the third side 172, the second part 162 is bonded to the first side 170, and the third part 163 is bonded to the fourth side 173. Along the thickness direction Z of the electrode assembly 120, at least a portion of the projections of the first part 161 and the third part 163 can overlap.

[0068] The first adhesive tape 160 comprehensively covers and secures the three sides of the electrode assembly 120 (third side 172, first side 170, and fourth side 173) through its three sections. This all-around securing method makes the electrode stack more robust and significantly enhances the structural stability of the battery cell 100. When the battery is subjected to external forces, the first adhesive tape 160 can provide effective support and cushioning, reducing the risk of deformation and damage to the electrode assembly 120. The all-around securing and protection helps prevent safety hazards such as short circuits and electrolyte leakage inside the electrode assembly 120. Especially in harsh environments such as vibration and impact, this design ensures the normal operation and safety of the battery.

[0069] Furthermore, the integrated design of the first adhesive tape 160 (comprising three parts) simplifies the assembly process of the battery cell 100. The first adhesive tape 160 can be applied to the three sides of the electrode assembly 120 in one go, eliminating the need to process multiple separate adhesive tape components, which helps improve production efficiency and reduce manufacturing costs.

[0070] Please refer to Figures 1 to 7 In this embodiment, along the length direction X of the electrode assembly 120, the dimensions of the first part 161 and the third part 163 are d, which satisfy: 5mm≤d≤80mm.

[0071] Given the weak binding ability of the opening surface (first side 170) of the electrode assembly 120 and the low heat dissipation efficiency of the electrode assembly 120, by comprehensively controlling the dimensions of the first part 161 and the third part 163 in the length direction X of the electrode assembly 120, the dimensions of the first part 161 and the third part 163 are both d, satisfying: 5mm≤d≤80mm. On the one hand, the first tape 160 can more firmly stack the positive electrode 131 and the negative electrode 132 of the electrode assembly 120 together, reducing the probability of wrinkles or folds in the electrode assembly 120 (positive electrode 131 or negative electrode 132). On the other hand, it can also reduce the risk of overheating damage to the battery cell 100 and improve the stability and reliability of the battery cell 100 operation.

[0072] For example, the size of d can be 5mm, 6mm, 9mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, or 80mm.

[0073] Please refer to Figures 1 to 7 In this embodiment, d satisfies: 8mm≤d≤60mm.

[0074] The requirement that d satisfies 8mm≤d≤60mm is achieved. On the one hand, the first tape 160 can be used to more firmly fix the stacked cells 130 of the electrode assembly 120 together, reducing the probability of wrinkles or folds in the positive electrode 131 and negative electrode 132. On the other hand, it can further reduce the risk of overheating damage to the battery cell 100 and further improve the stability and reliability of the battery cell 100 operation.

[0075] For example, the size of d can be 8mm, 9mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, or 60mm.

[0076] Please refer to Figures 1 to 7 In this embodiment, along the width direction Y of the electrode assembly 120, the size of the electrode assembly 120 is W, which satisfies: 0.04≤D1 / W≤0.4.

[0077] For example, the size D1 of the first adhesive tape 160 can be 1-50mm, such as 1mm, 3mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm, 25mm, 30mm, 40mm, 50mm, etc., and the size W of the electrode assembly 120 can be 80-130mm, such as 85mm, 90mm, 91mm, 96mm, 100mm, 110mm, 120mm, 130mm, and D1 / W can be 0.04, 0.06, 0.10, 0.11, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, etc.

[0078] The value of 0.04≤D1 / W≤0.4 can reduce the probability of interference between the first tape 160 and the first tab 140, making the current transmission of the electrode assembly 120 more stable. On the other hand, it can make the first tape 160 more firmly fix the multiple stacked positive electrode plates 131 and negative electrode plates 132 together, making the battery cell 100 operate more stably and reliably, and greatly reducing the probability of battery cell 100 failure.

[0079] Please refer to Figures 1 to 7 In this embodiment, the electrode assembly 120 has a fifth side 174 and a sixth side 175. Along the width direction Y of the electrode assembly 120, the fifth side 174 and the sixth side 175 are arranged opposite to each other. The distance between the first tape 160 and the fifth side 174 or the sixth side 175 is D2, which satisfies: 5mm≤D2≤30mm.

[0080] For example, the distance D2 between the first tape 160 and the fifth side 174 or the sixth side 175 can be 5mm, 6mm, 7mm, 10mm, 15mm, 17mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, or 30mm.

[0081] Along the width direction Y of the electrode assembly 120, the projections of the fifth side 174 and the sixth side 175 coincide. The distance between the first tape 160 and the fifth side 174 or the sixth side 175 is D2, which satisfies: 5mm≤D2≤30mm. This ensures that the first tape 160 does not excessively restrict the expansion of the electrode assembly 120, thus allowing the electrode assembly 120 to have a certain expansion and contraction space during charging and discharging. On the other hand, it reduces the probability of the first tape 160 interfering with other structures (such as the first tab 140), reduces the probability of the positive electrode 131 and the negative electrode 132 folding, and improves the stability and reliability of the battery cell 100.

[0082] In addition, the distance between the first tape 160 and the fifth side 174 or the sixth side 175 is D2, which satisfies: 5mm≤D2≤30mm. This can also reduce stress concentration and deformation of the electrode assembly 120, thereby extending the service life of the battery cell 100 and improving its performance.

[0083] Please refer to Figures 1 to 7 In this embodiment, along the width direction Y of the electrode assembly 120, the distance between the first tape 160 and the first tab 140 is D3, which satisfies: 5mm≤D3≤20mm.

[0084] For example, the distance D3 between the first tape 160 and the first tab 140 can be 5mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, or 20mm.

[0085] When the battery cell 100 is running, current flows through the first tab 140, which generates heat. If the distance between the first tab 140 and the first adhesive tape 160 is too close, the first adhesive tape 160 will be heated, which may cause the adhesion of the first adhesive tape 160 to deteriorate, and the electrode may become loose or shift.

[0086] The distance between the first tape 160 and the first tab 140 is D3, which satisfies: 5mm≤D3≤20mm. This allows the first tape 160 to more firmly fix multiple stacked electrode sheets together, reducing the probability of the positive electrode sheet 131 and the negative electrode sheet 132 being flipped or wrinkled, and improving the stability and reliability of the battery cell 100.

[0087] For example, Figure 1 and Figure 2 The image shown depicts the battery cell cover during the assembly process, not a structural diagram of a battery cell that has already been assembled.

[0088] Please refer to Figures 1 to 7 In this embodiment, the outer shell 110 includes a shell 111 and a cover plate 112. The shell 111 has an opening, and the cover plate 112 is connected to the shell 111 to block the opening. The cover plate 112 is provided with an injection hole 180. The projection of the injection hole 180 on the first side 170 overlaps with the projection of the first tape 160.

[0089] During the production of the battery cell 100, an appropriate amount of electrolyte needs to be injected into the battery cell 100 through the injection port 180. The electrolyte is the medium for chemical reactions in the battery, and it has a significant impact on the battery's performance and lifespan. By precisely controlling the amount of electrolyte injected, it is possible to ensure that the chemical reactions inside the battery can proceed stably, thereby providing stable voltage and current output.

[0090] Since the projection of the injection hole 180 overlaps with the projection of the first tape 160, the first tape 160 protects the electrode assembly 120 when the electrolyte is injected, preventing the electrode assembly 120 from being affected by the electrolyte injection, reducing the probability of the positive electrode 131 or negative electrode 132 being flipped, and improving the stability and reliability of the battery cell 100.

[0091] Please refer to Figures 1 to 7 The battery cell 100 further includes a second tab 150, wherein the first tab 140 and the second tab 150 have opposite polarities, and the second tab 150 is disposed on the second side 171.

[0092] For example, the first electrode 140 can be configured as a positive electrode, and the second electrode 150 can be configured as a negative electrode. The polarities of the first electrode 140 and the second electrode 150 are opposite. The first electrode 140 and the second electrode 150 are respectively disposed on the first side 170 and the second side 171, that is, the first electrode 140 and the second electrode 150 are located at both ends in the length direction X of the electrode assembly 120. The first electrode 140 and the second electrode 150 can output current from the electrode assembly 120, and can also input external current into the electrode assembly 120.

[0093] Secondly, embodiments of this application provide a battery device, including the battery cell 100 as described in any one of the embodiments of this application.

[0094] The battery device proposed in this application has improved stability because it is equipped with the aforementioned battery cell 100.

[0095] Thirdly, embodiments of this application provide an electrical device, including a battery cell 100 or a battery device as described in any one of the embodiments of this application.

[0096] The electrical equipment proposed in this application embodiment has improved stability due to the presence of the aforementioned battery cells or battery devices, thereby enhancing the user experience and safety.

[0097] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0098] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0099] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

[0100] Although embodiments of this application 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 this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity; An electrode assembly is disposed within the receiving cavity. The electrode assembly is constructed as a stacked cell, which includes a positive electrode and a negative electrode. Multiple positive and negative electrodes are stacked along the thickness direction of the electrode assembly. The electrode assembly has a first side and a second side that are opposite each other in the length direction. The first electrode tab is disposed on the first side surface; A first adhesive tape is attached to the first side surface. The first adhesive tape has a size of D1 along the width direction of the electrode assembly and a size of L along the length direction of the electrode assembly, satisfying: L≥250mm and 0.0064≤D1 / L≤0.

15.

2. The battery cell according to claim 1, characterized in that, A portion of the first tape extends to the side of the electrode assembly in the thickness direction.

3. The battery cell according to claim 2, characterized in that, The electrode assembly has a third side and a fourth side, which are arranged opposite to each other along the thickness direction of the electrode assembly. The first tape includes a first part, a second part, and a third part connected in sequence. The first part is adhered to the third side, the second part is adhered to the first side, and the third part is adhered to the fourth side.

4. The battery cell according to claim 3, characterized in that, Along the length of the electrode assembly, the dimensions of the first part and the third part are d, which satisfy: 5mm≤d≤80mm.

5. The battery cell according to claim 4, characterized in that, The condition d satisfies: 8mm≤d≤60mm.

6. The battery cell according to claim 1, characterized in that, Along the width direction of the electrode assembly, the dimension of the electrode assembly is W, which satisfies: 0.04≤D1 / W≤0.

4.

7. The battery cell according to claim 1, characterized in that, The electrode assembly has a fifth side and a sixth side. The fifth side and the sixth side are arranged opposite to each other along the width direction of the electrode assembly. The distance between the first tape and the fifth side or the sixth side is D2, which satisfies: 5mm≤D2≤30mm.

8. The battery cell according to claim 1, characterized in that, Along the width direction of the electrode assembly, the distance between the first tape and the first tab is D3, which satisfies: 5mm≤D3≤20mm.

9. The battery cell according to claim 1, characterized in that, The outer casing includes a housing and a cover plate. The housing has an opening, and the cover plate is connected to the housing to seal the opening. The cover plate is provided with a liquid injection hole. The projection of the injection hole on the first side overlaps with the projection of the first tape.

10. The battery cell according to claim 1, characterized in that, The battery cell also includes a second tab, the first tab and the second tab have opposite polarities, and the second tab is disposed on the second side.

11. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-10.

12. An electrical appliance, characterized in that, Includes the battery cell according to any one of claims 1-10 or the battery device according to claim 11.

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