Battery cell and electric device

Abstract

The application discloses an electric core and an electric device. The electric core comprises a shell, an electrode assembly, a current collecting plate and an insulating piece. The electrode assembly is arranged in the shell, and has a first electrode end and a side wall connected with each other. The first electrode end has a first area and a second area. The current collecting plate is connected to the first electrode end. In a first direction, a projection of the current collecting plate on the first electrode end at least partially overlaps the first area. The insulating piece comprises a first part, a second part and a third part connected in sequence. The first part is connected to a side of the current collecting plate away from the first electrode end. The second part is arranged obliquely. The third part is connected to the side wall. In a second direction, a distance between the third part and the current collecting plate is a. In the first direction, a thickness of the current collecting plate is b, and a length of the second part is c. a, b and c satisfy the following conditions: the second area and the second part form an electrolyte channel, and the electrolyte channel is beneficial to improving the electrolyte infiltration effect of the electric core.

Description

Technical Field

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

[0002] A battery cell with a full tab structure has multiple tabs at the end of the cell. These tabs are flattened to form a polarized end face. The superposition of multiple tabs helps to reduce the internal resistance of the cell, increase the charge and discharge rate of the cell, and reduce the temperature rise during charge and discharge.

[0003] Currently, the end face of the omnipolar battery cell is connected to a current collector, and an adhesive layer is attached to the end face of the cell and the current collector. The end face of the cell is blocked by the adhesive layer, making it difficult for the electrode liquid to enter the cell, which leads to poor electrolyte wetting. Summary of the Invention

[0004] In view of this, it is necessary to provide a battery cell that is conducive to improving the electrolyte wetting effect.

[0005] Some embodiments of this application provide a battery cell, which includes a housing, an electrode assembly, a current collector, and an insulating component. The electrode assembly is disposed within the housing and has a first electrode end and a sidewall connected to the first electrode end. The first electrode end has a first region and a second region. The current collector is connected to the first electrode end, and along a first direction perpendicular to the current collector, the projection of the current collector onto the first electrode end at least partially overlaps with the first region. The insulating component includes a first part, a second part, and a third part connected sequentially. The first part is connected to the side of the current collector away from the first electrode end. Along the first direction, the second part is inclined, and the third part is connected to the sidewall. Along a second direction perpendicular to the first direction, the distance between the third part and the current collector is 'a'. Along the first direction, the thickness of the current collector is 'b', and the length of the second part is 'c'. a, b, and c satisfy...

[0006] In the above embodiments, the second portion is inclined along the first direction, which facilitates the formation of an electrolyte channel between the second portion and the second region, enabling the electrolyte to enter the electrode assembly from the second region, thereby satisfying the requirements of… This allows the second part to have a sufficient length to be formed, which also helps reduce the risk that the second part might be too long and bend towards the second region, thus blocking the electrolyte channel and improving the electrolyte wetting effect of the battery cell.

[0007] In some embodiments, the second region is disposed around the first region.

[0008] In the above embodiments, the second region is arranged around the first region, which is beneficial to ensure that the current collector does not extend beyond the end of the first electrode when viewed along the first direction, thereby reducing the risk of short circuit caused by the current collector coming into contact with the housing or an electrode with a different polarity than the current collector.

[0009] In some embodiments, the first portion is disposed around the collector plate, and the third portion is disposed around the sidewall.

[0010] In the above embodiments, the first part is arranged around the current collector and the third part is arranged around the side wall. This is beneficial to increasing the contact area between the insulating component and the current collector and the side wall, thereby improving the effect of the insulating component in restricting the movement of the current collector. It is also beneficial to increase the area of ​​the insulating component covering the edge of the current collector and the side wall, reducing the risk of short circuit caused by the current collector contacting the housing, and also reducing the risk of short circuit caused by the tab at the end of the first electrode contacting the housing.

[0011] In some embodiments, a, b, and c satisfy...

[0012] In the above embodiments, when a, b, and c satisfy... This allows the second part to have room to move, reducing the tension it exerts on the first and third parts when the second part is taut, thus reducing the risk of the first part detaching from the collector plate or the third part detaching from the sidewall under stress.

[0013] In some embodiments, a satisfies 1mm ≤ a ≤ 5mm.

[0014] In the above embodiments, the distance 'a' between the third part and the collector plate satisfies 1mm ≤ a ≤ 5mm, which is beneficial for increasing the amount of electrolyte that the electrolyte channel can accommodate. In embodiments where the electrolyte enters the electrolyte channel through the through-hole on the collector plate, the distance 'a' between the third part and the collector plate satisfies 1mm ≤ a ≤ 5mm, which is beneficial for shortening the distance between the through-hole and the outermost ring of the electrode assembly, thereby reducing the stroke of the electrolyte to reach the outermost ring or multiple outer rings of the electrode assembly, thus improving the wetting efficiency and consequently improving the electrolyte wetting effect of the battery cell.

[0015] In some embodiments, a satisfies 2mm≤a≤4mm.

[0016] In the above embodiments, the distance 'a' between the third part and the collector plate also satisfies 2mm≤a≤4mm, which is beneficial for balancing the capacity of the electrolyte channel and the stroke of the electrolyte flowing to the outermost ring of the electrode assembly.

[0017] In some embodiments, b satisfies 0.1mm ≤ b ≤ 1mm.

[0018] In the above embodiments, the thickness b of the manifold satisfies 0.1mm≤b≤1mm, which is beneficial to improving the strength of the manifold, reducing the risk of the manifold being too thin and being welded through, and also reducing the risk of the manifold being too thick and occupying too much space in the receiving cavity.

[0019] In some embodiments, b satisfies 0.2mm≤b≤0.5mm.

[0020] In the above embodiments, the thickness b of the collector plate also satisfies 0.2mm≤b≤0.5mm, which is beneficial to balancing the strength of the collector plate and the space occupied by the collector plate.

[0021] In some embodiments, the collector plate is provided with a through hole that extends through the collector plate in a first direction.

[0022] In the above embodiments, the through hole facilitates the entry of electrolyte between the current collector and the end of the first electrode, thereby improving the electrolyte wetting effect of the battery cell.

[0023] In some embodiments, the distance between the through hole and the second region is d along a second direction perpendicular to the first direction, and the length of the projection of the first portion onto the collector plate along the second direction is e, where d and e satisfy d > e.

[0024] In the above embodiments, d and e satisfy d > e, which helps to reduce the risk of the first part covering and blocking the through hole.

[0025] In some embodiments, along the second direction, a and d satisfy a*d≤16mm 2 .

[0026] In the above embodiments, a and d satisfy a*d≤16mm 2 This helps to shorten the distance between the through hole and the outermost ring of the electrode assembly, thereby reducing the travel distance of the electrolyte to the outermost ring or multiple outer rings of the electrode assembly, thus improving the wetting efficiency and improving the electrolyte wetting effect of the battery cell.

[0027] In some embodiments, e satisfies 2mm≤e≤4mm.

[0028] In the above embodiments, e satisfies 2mm≤e≤4mm, which also helps to reduce the risk of the first part being too long and covering or blocking the through hole.

[0029] In some embodiments, the electrode assembly further has a second electrode end, wherein the first electrode end is located at one end of the sidewall and the second electrode end is located at the other end of the sidewall along a first direction.

[0030] In addition, this application also provides an electrical device that is beneficial to improving performance.

[0031] Some embodiments of this application provide an electrical device, which includes a device body and a battery cell as described in any of the above embodiments, the battery cell being mounted on the device body.

[0032] In the above embodiments, the electrolyte wetting effect of the battery cell is improved, thereby improving the rate performance, discharge capacity and service life of the battery cell, which in turn helps to improve the performance and service life of electrical equipment.

[0033] The battery cell in this application includes a housing and electrode assemblies, current collectors, and insulating components located within the housing. The technical solution adopted in this application allows the second portion to have a shapeable length, and also helps reduce the risk of the second portion becoming too long and bending towards the second region, thus blocking the electrolyte channels, thereby improving the electrolyte wetting effect of the battery cell. Attached Figure Description

[0034] Figure 1 This is a side view of a battery cell provided in an embodiment of this application.

[0035] Figure 2 for Figure 1 A cross-sectional view of the cell along section line I-I.

[0036] Figure 3 for Figure 2 A magnified view of part A in the middle.

[0037] Figure 4 This is a top view of the battery cell after it has been concealed in the housing, according to an embodiment of this application.

[0038] Figure 5 This is a side view of the battery cell after it has been concealed in the housing, according to an embodiment of this application.

[0039] Figure 6 This is a partial cross-sectional view of the battery cell after it has been concealed in the casing, according to an embodiment of this application.

[0040] Figure 7 This is a schematic diagram showing the relationship between the values ​​of a, d, and e in this application.

[0041] Figure 8 This is a schematic diagram of an electrical device provided in an embodiment of this application.

[0042] Explanation of main component symbols

[0043] 100 cells

[0044] Casing 10

[0045] Shell body 11

[0046] Cover 12

[0047] Containment cavity 101

[0048] Electrode assembly 20

[0049] First electrode end 21

[0050] District 1, 211

[0051] Second District 212

[0052] Side wall 22

[0053] Second electrode end 23

[0054] 30 Collection Panel

[0055] Main body 301

[0056] Connecting part 302

[0057] Through hole 31

[0058] Insulating component 40

[0059] Part 1, Chapter 41

[0060] Part 2, page 42

[0061] Part 3, 43

[0062] Insulating gasket 50

[0063] First conductive element 60

[0064] Second conductive component 70

[0065] Current interruption structure 71

[0066] Electrolyte channel 10a

[0067] Equipment body 200

[0068] 1000 electrical appliances

[0069] First direction X

[0070] Second direction Y Detailed Implementation

[0071] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0072] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0073] The term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular. For example, in numerical terms, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is straight or plane, the component can be considered a "straight line" or "plane".

[0074] It should be noted that when a parameter is greater than, equal to or less than a certain endpoint value, it should be understood that the endpoint value is allowed to have a tolerance of ±5%.

[0075] Unless otherwise specified, the term "multiple" as used herein refers to one or more.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0077] This application discloses a battery cell, comprising a housing, an electrode assembly, a current collector, and an insulating component. The electrode assembly is disposed within the housing and has a first electrode end and a sidewall connected to the first electrode end. The first electrode end has a first region and a second region. The current collector is connected to the first electrode end, and along a first direction perpendicular to the current collector, the projection of the current collector onto the first electrode end at least partially overlaps with the first region. The insulating component includes a first part, a second part, and a third part connected sequentially. The first part is connected to the side of the current collector away from the first electrode end. Along the first direction, the second part is inclined, and the third part is connected to the sidewall. Along a second direction perpendicular to the first direction, the distance between the third part and the current collector is 'a'. Along the first direction, the thickness of the current collector is 'b', and the length of the second part is 'c'. a, b, and c satisfy the following conditions:

[0078] The aforementioned inclined arrangement between the second region and the second part facilitates the formation of an electrolyte channel between the second part and the second region, enabling the electrolyte to enter the electrode assembly from the second region. This is achieved by satisfying a, b, and c. This allows the second part to have a sufficient length to be formed, which also helps reduce the risk that the second part might be too long and bend towards the second region, thus blocking the electrolyte channel and improving the electrolyte wetting effect of the battery cell.

[0079] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0080] Please see Figures 1 to 3 This application provides a battery cell 100, which includes a housing 10, an electrode assembly 20, a current collector 30, and an insulating member 40. The electrode assembly 20 is disposed inside the housing 10 and has a first electrode end 21 and a side wall 22 connected to the first electrode end 21. The current collector 30 is connected to the first electrode end 21, and the insulating member 40 is connected to the current collector 30 and the side wall 22.

[0081] In some embodiments, please refer to Figure 1 and Figure 2 The housing 10 includes a conductive housing body 11 and a cover 12, which are insulated from each other. The housing body 11 and the cover 12 are surrounded by a receiving cavity 101 for receiving the electrode assembly 20.

[0082] In some embodiments, please refer to Figure 1 and Figure 2 The shell body 11 and the cover body 12 are arranged in a cylindrical structure, and the battery cell 100 is a cylindrical battery.

[0083] In some embodiments, please refer to Figure 3 An insulating gasket 50 is fixed between the shell body 11 and the cover body 12, and the insulating gasket 50 insulates the cover body 12 from the shell body 11.

[0084] In some embodiments, the electrode assembly 20 includes a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. The positive electrode, separator, and negative electrode are stacked and then wound to form a wound structure. The positive electrode is formed by bonding a positive active material layer onto a metal layer, and the negative electrode is formed by bonding a negative active material layer onto a metal layer. Different metal materials are used for electrodes of different polarities.

[0085] As an example, the positive electrode includes an aluminum layer, on which one or more positive electrode active material layers, such as lithium nickel cobalt manganese oxide, lithium cobalt manganese oxide, lithium cobalt oxide, lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium manganese oxide, lithium manganese iron phosphate, or cobalt-free materials, are uniformly coated, along with an edge protective slurry. The electrode is then cold-pressed to obtain the positive electrode. Specifically, the positive electrode active material layer may consist of 97.8 wt% lithium nickel cobalt manganese oxide, 0.8 wt% polyvinylidene fluoride, and 1.4 wt% conductive carbon black. The protective slurry may consist of 90.0 wt% Al₂O₃ and 10.0 wt% polyvinylidene fluoride. The negative electrode includes a copper layer, on which one or more negative electrode active material layers, such as artificial graphite, natural graphite, or silicon, are uniformly coated, followed by cold pressing to obtain the negative electrode. The negative electrode active material layer can specifically consist of 97.7 wt% artificial graphite, 1.3 wt% carboxymethyl cellulose, and 1.0 wt% styrene-butadiene rubber.

[0086] In some embodiments, the separator is an insulating film material such as polyethylene film, polypropylene film, polyester film, or polyimide film, so as to isolate the positive electrode and the negative electrode.

[0087] In some embodiments, please refer to Figure 2 and Figure 3 The outermost layer of the wound electrode assembly 20 forms a sidewall 22, which can be formed by a positive electrode sheet, for example, the outermost layer of the wound structure is a positive electrode sheet. The sidewall 22 can also be formed by a negative electrode sheet, for example, the outermost layer of the wound structure is a negative electrode sheet.

[0088] In some embodiments, along the first direction X, a plurality of tabs are cut from the positive or negative electrode sheet at one end of the electrode assembly 20. The plurality of tabs are flattened to form a first electrode end 21. The polarity of the first electrode end 21 can be either positive or negative, and no specific limitation is made here.

[0089] Please see Figure 4 The first electrode end 21 has a first region 211 and a second region 212, both of which are flattened areas of the electrode end 21.

[0090] In some embodiments, please refer to Figure 4 The second region 212 is arranged around the first region 211, which is beneficial to ensure that the current collector 30 does not exceed the end 21 of the first electrode when observed along the first direction X, and reduces the risk of short circuit caused by the current collector 30 coming into contact with the housing 10 or an electrode with a different polarity than the current collector 30.

[0091] Please see Figures 3 to 5The first electrode end 21 is connected to the current collector 30, so that the polarity of the current collector 30 is the same as that of the first electrode end 21. Along the first direction X perpendicular to the current collector 30, the projection of the current collector 30 onto the first electrode end 21 at least partially overlaps with the first region 211, so that the current collector 30 does not contact the second region 212.

[0092] In some embodiments, please refer to Figure 4 and Figure 5 The collector plate 30 is provided with a through hole 31, through which electrolyte can enter between the collector plate 30 and the first zone 211, thereby allowing the electrolyte to enter the interior of the electrode assembly 20.

[0093] In some embodiments, the electrolyte contains a lithium salt and a solvent. The lithium salt may be LiPF6, LiBF4, LiClO4, LiB(C6H), LiCH3SO3, LiCF3SO3, LiN(SO2CF3)2, LiC(SO2CF3)3, or LiBOB. The solvent may be a carbonate compound, a carboxylic acid ester compound, an ether compound, other organic solvents, or a combination thereof.

[0094] In some embodiments, please refer to Figure 4 and Figure 5 The number of through holes 31 provided in the collector plate 30 can be one or more, and no specific limitation is made here.

[0095] In some embodiments, the manifold 30 is welded to the first electrode end 21. The welding method can be resistance welding, laser welding, arc welding, or ultrasonic welding.

[0096] In some embodiments, please refer to Figure 3 The collector plate 30 includes a main body 301 and a connecting part 302. The main body 301 is welded to the first electrode end 21. The connecting part 302 extends out from the main body 301 and is folded to be electrically connected to the cover 12, so that the polarity of the cover 12 is the same as the polarity of the first electrode end 21.

[0097] In some embodiments, please refer to Figure 3 The battery cell 100 also includes a first conductive element 60 and a second conductive element 70 located within the receiving cavity 101. The first conductive element 60 is electrically connected to the connecting portion 302 and is also connected to the second conductive element 70. The second conductive element 70 is electrically connected to the cover 12, thereby realizing the electrical connection between the connecting portion 302 and the cover 12. The second conductive element 70 is also provided with a current interruption structure 71. When the electrode assembly 20 malfunctions and causes the internal air pressure of the receiving cavity 101 to be too high, the current interruption structure 71 disconnects the second conductive element 70 from the first conductive element 60 to interrupt the current.

[0098] In related technologies, after connecting the first housing 10 and the second housing 10, electrolyte is injected into the receiving cavity 101. The electrolyte passes through the through hole 31 of the current collector 30 to enter between the current collector 30 and the first region 211, and the electrolyte enters the interior of the electrode assembly 20 from the first region 211. Insulating adhesive is attached to the surface of the current collector 30 away from the first region 211, the surface of the second region 212, and the surface of the side wall 22. The insulating adhesive can restrict the movement of the current collector 30. However, the adhesion of the insulating adhesive to the second region 212 makes it difficult for the electrolyte to enter the interior of the electrode assembly 20 from the second region 212, resulting in poor electrolyte wetting effect of the battery cell 100.

[0099] In some embodiments of this application, please refer to Figure 5 and Figure 6 The insulating component 40 includes a first part 41, a second part 42, and a third part 43 connected in sequence. The first part 41 is connected to the side of the current collector 30 away from the first electrode end 21. Along the first direction X, the second part 42 is inclined, and the third part 43 is connected to the sidewall 22. Along the second direction Y perpendicular to the first direction X, the distance between the third part 43 and the current collector 30 is a. Along the first direction X, the thickness of the current collector 30 is b, and the length of the second part 42 is c. a, b, and c satisfy... The first part 41 is connected to the collector plate 30, and the third part 43 is connected to the side wall 22, which restricts the movement of the collector plate 30. Along the first direction X, the second part 42 is inclined, which facilitates the formation of an electrolyte channel 10a between the second part 42 and the second region 212, allowing the electrolyte to enter the electrode assembly 20 from the second region 212. By ensuring that a, b, and c satisfy... This allows the second part 42 to have a sufficient length for shaping, which also helps reduce the risk that the second part 42 is too long and bends in the direction of the second region 212, blocking the electrolyte channel 10a. This, in turn, helps improve the electrolyte wetting effect of the cell 100. It also helps reduce the risk that the second part 42 is too long and bends in the direction away from the second region 212, occupying more space. This reduces the risk of interference between the insulating component 40 and the insulating pad 50, the first conductive component 60 or the second conductive component 70, and thus helps reduce the difficulty of assembling the cell 100.

[0100] It is understandable that by reducing the space occupied by the insulation component 40, the internal structure of the cell 100 can be made more compact, thereby reducing the overall space occupied by the cell 100 and thus improving the energy density of the cell 100.

[0101] It should be noted that you should refer to [link / reference]. Figure 5 and Figure 6The electrolyte can enter from the through hole 31 between the collector plate 30 and the first zone 211, and then enter from the collector plate 30 and the first zone 211 into the electrolyte channel 10a between the second part 42 and the second zone 212. For example... Figure 4 Alternatively, a portion of the edge of the collector 30 may not be in contact with the insulating element 40, allowing the electrolyte to enter the electrolyte channel 10a between the collector 30 and the second zone 212 from this non-contact position. Of course, there are other ways for the electrolyte to enter the electrolyte channel 10a, which will not be elaborated upon here.

[0102] For ease of understanding, this application provides the following embodiments and comparative examples to illustrate the formula. The influence of electrolyte wetting effect is explained.

[0103] Example

[0104] The current collector 30 is connected to the end 21 of the first electrode by welding. Along the first direction X, the projection of the current collector 30 onto the end 21 of the first electrode overlaps with the first region 211. Along the first direction X, the length of the electrode assembly 20 is 65 mm. Along the second direction Y, the diameter of the electrode assembly 20 is 20 mm. The distance a = 2 mm between the third part 43 and the current collector 30, the thickness b = 0.4 mm of the current collector 30, and the length c = 2.1 mm of the second part 42, where a, b, and c satisfy... After the electrolyte wetting process was completed in the cell 100, a charge-discharge test was performed. After the charge-discharge test was completed, no black spots or lithium plating were observed in the electrode assembly 20.

[0105] Comparative Example

[0106] The current collector 30 is connected to the end 21 of the first electrode by welding. Along the first direction X, the projection of the current collector 30 onto the end 21 of the first electrode overlaps with the first region 211. Along the first direction X, the length of the electrode assembly 20 is 65 mm. Along the second direction Y, the diameter of the electrode assembly 20 is 20 mm. The distance a = 2 mm between the third part 43 and the current collector 30, the thickness b = 0.4 mm of the current collector 30, and the length c = 3 mm of the second part 42. a, b, and c do not satisfy... After the electrolyte wetting process is completed in the cell 100, a charge-discharge test is performed. After the charge-discharge test is completed, lithium plating occurs on the outermost ring of the electrode assembly 20.

[0107] The charge / discharge test process in this embodiment is as follows:

[0108] The first step is to charge cell 100 at a constant current of 2C (1C represents the current that fully charges the cell in 1 hour) to the full charge voltage (e.g., 4.2V) at 25℃, and then charge cell 100 at a constant voltage of 4.2V to 0.05C.

[0109] The second step is to let the battery cell 100 stand for 30 minutes;

[0110] The third step is to discharge cell 100 at 10C to its full discharge voltage (e.g., 2.5V).

[0111] Fourth step, let the battery cell 100 stand for 60 minutes;

[0112] Fifth, repeat steps one through four 100 times.

[0113] In this embodiment, the criterion for determining black spots is as follows: observe the electrode assembly 20 when the battery cell 100 is fully charged; if the area of ​​black spots on the surface of the electrode assembly 20 is greater than 0.25 cm², then... 2 When black or grayish-black spots appear, it is determined that black spots have appeared on electrode assembly 20.

[0114] In this embodiment, the criterion for determining lithium plating is: observe the electrode assembly 20 when the battery cell 100 is fully charged; if the surface of the electrode assembly 20 shows an area greater than 0.25 cm²... 2 When silvery-white or silvery-gray spots are observed on the surface of electrode assembly 20 and dendritic crystals can be observed on the surface of the electrode assembly 20 under a scanning electron microscope, it is determined that lithium plating has occurred in electrode assembly 20.

[0115] It is understood that in other embodiments, the present application can also complete the charge and discharge test of the battery cell 100 through other processes, and the determination methods for black spots and lithium plating can also be changed accordingly, which will not be elaborated here.

[0116] In some embodiments, please refer to Figure 4 and Figure 5 The first part 41 is arranged around the current collector 30, and the third part 43 is arranged around the side wall 22. This helps to increase the contact area between the insulating member 40 and the current collector 30 and the side wall 22, thereby improving the effect of the insulating member 40 in restricting the movement of the current collector 30. It also helps to increase the area of ​​the insulating member 40 covering the edge of the current collector 30 and the side wall 22, reducing the risk of short circuit caused by the current collector 30 contacting the housing 10, and also reducing the risk of short circuit caused by the tab of the first electrode end 21 contacting the housing 10.

[0117] In some embodiments, the insulating member 40 is a single-sided adhesive. The adhesive surface of the first portion 41 contacts the surface of the collector 30 opposite to the first electrode end 21, and the adhesive surface of the third portion 43 contacts the sidewall 22. The use of an adhesive to fix the insulating member 40 to the electrode assembly 20 facilitates its attachment. Furthermore, the single-sided adhesive nature of the adhesive facilitates the application of the insulating member 40. Additionally, the thin, flexible adhesive reduces the space occupied by the insulating member 40 within the receiving cavity 101.

[0118] In some other embodiments, the insulating element 40 may also be provided as an insulating adhesive with adhesive on both sides.

[0119] In some embodiments, the insulating element 40 includes multiple layers of insulating adhesive, which can be laminated together to improve the strength of the insulating element 40. Specifically, it can be one layer, two layers or three layers, without any specific limitation.

[0120] In some embodiments, the insulating adhesive includes a substrate and an adhesive layer disposed on the substrate. The adhesive layer is disposed on one side of the substrate to form an insulating adhesive with adhesiveness on one side only, and adhesive layers are disposed on two opposite sides of the substrate to form an insulating adhesive with adhesiveness on both sides only.

[0121] In some embodiments, please refer to Figure 5 and Figure 6 The length c of the second part 42 also satisfies This length allows the second part 42 to have a suitable length for forming, and also reduces the risk that an excessively long second part 42 might bend towards the second region 212 and block the electrolyte channel 10a, or reduce the risk that an excessively long second part 42 might bend away from the second region 212 and occupy more space. The length c of the second part 42 also satisfies... At the same time, it also helps to allow the second part 42 to have room to move, reducing the tension that the second part 42 exerts on the first part 41 and the third part 43 when the second part 42 is taut, thereby reducing the risk that the first part 41 will detach from the collector plate 30 or the third part 43 will detach from the side wall 22 under force.

[0122] In some embodiments, the distance 'a' between the third portion 43 and the collector plate 30 satisfies 1mm ≤ a ≤ 5mm, which is beneficial for increasing the amount of electrolyte that the electrolyte channel 10a can accommodate. In embodiments where the electrolyte enters the electrolyte channel 10a through the through hole 31 on the collector plate 30, the distance 'a' between the third portion 43 and the collector plate 30 satisfies 1mm ≤ a ≤ 5mm, which is beneficial for shortening the distance between the through hole 31 and the outermost ring of the electrode assembly 20, reducing the travel distance of the electrolyte to the outermost ring or multiple outer rings of the electrode assembly 20, thereby improving the electrolyte wetting efficiency and thus improving the electrolyte wetting effect of the battery cell 100. The specific value of 'a' can be 1mm, 2mm, 3mm, 4mm, or 5mm, etc., and will not be listed here.

[0123] In some embodiments, the distance a between the third part 43 and the collector plate 30 also satisfies 2mm≤a≤4mm, which is beneficial for balancing the capacity of the electrolyte channel 10a and the stroke of the electrolyte flowing to the outermost ring of the electrode assembly 20.

[0124] In some embodiments, the thickness b of the manifold 30 satisfies 0.1mm ≤ b ≤ 1mm. This is beneficial for improving the strength of the manifold 30, reducing the risk of the manifold 30 being too thin and thus being welded through, and also for reducing the risk of the manifold 30 being too thick and occupying too much space within the receiving cavity 101. The specific value of b can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, etc., and will not be listed here.

[0125] In some embodiments, the thickness b of the collector plate 30 also satisfies 0.2mm≤b≤0.5mm, which is beneficial for balancing the strength of the collector plate 30 and the space occupied by the collector plate 30.

[0126] In some embodiments, please refer to Figure 6 Along the second direction Y perpendicular to the first direction X, the distance between the through hole 31 and the second area 212 is d. Along the first direction X, the length of the projection of the first part 41 on the collector plate 30 in the second direction Y is e, which satisfies d>e, which helps to reduce the risk of the first part 41 covering and blocking the through hole 31.

[0127] In some embodiments, the projection of the first portion 41 onto the collector plate 30, with a length e in the second direction Y, satisfies 2mm ≤ e ≤ 4mm. This is beneficial for increasing the contact area between the first portion and the collector plate 30, enhancing the effect of the insulating member 40 in restricting the movement of the collector plate 30, and reducing the risk of contact between the collector plate 30 and the housing 10. The fact that the projection of the first portion 41 onto the collector plate 30, with a length e in the second direction Y, satisfies 2mm ≤ e ≤ 4mm also helps reduce the risk that the first portion 41 may be too long and cover or obstruct the through hole 31.

[0128] In some embodiments, please refer to Figure 6 and Figure 7 When the distance 'a' between the third part 43 and the collector plate 30 is constant, the distance 'd' between the through hole 31 and the second zone 212 satisfies a*d≤16mm. 2 This helps to shorten the distance between the through hole 31 and the outermost ring of the electrode assembly 20, reduce the travel distance of the electrolyte to the outermost ring or multiple outer rings of the electrode assembly 20, thereby improving the wetting efficiency and thus improving the electrolyte wetting effect of the battery cell 100.

[0129] As an example, please refer to Figure 7 The condition is that d > e and a*d ≤ 16mm. 2 In the case where the distance a between the third part 43 and the collector plate 30 satisfies 2mm≤a≤4mm, the distance d between the through hole 31 and the second area 212 satisfies the filling area of ​​part B in the figure.

[0130] In some embodiments, please refer to Figure 2 The electrode assembly 20 also has a second electrode end 23 along the first direction X. The first electrode end 21 is located at one end of the sidewall 22, and the second electrode end 23 is located at the other end of the sidewall 22. The polarity of the second electrode end 23 is opposite to that of the first electrode end 21.

[0131] In some embodiments, a current collector 30 is connected to the second electrode end 23, and an insulating member 40 is connected to the side wall 22 on the current collector 30 on the second electrode end 23. The current collector 30 is electrically connected to the shell body 11, so that the polarity of the shell body 11 is the same as the polarity of the second electrode end 23.

[0132] It should be noted that the arrangement between the second electrode end 23 and the current collector 30 and the insulating member 40 can refer to the above-described embodiment of the arrangement between the first electrode end 21 and the current collector 30 and the insulating member 40, and will not be repeated here.

[0133] Please see Figure 8 The embodiments of this application also provide an electrical device 1000, which includes a device body 200 and a battery cell 100 as described in any of the above embodiments, the battery cell 100 being installed in the device body 200. The electrolyte wetting effect of the battery cell 100 is improved, thereby improving the rate performance, discharge capacity and service life of the battery cell 100, which in turn helps to improve the performance and service life of the electrical device 1000.

[0134] Since the electrical equipment 1000 adopts the technical solution of any of the above embodiments of the battery cell 100, it has at least the beneficial effects brought about by the technical solution of any of the above embodiments of the battery cell 100, which will not be repeated here.

[0135] Among them, electrical equipment 1000 can be electric vehicles, household appliances, power tools, laptops, digital cameras, lighting equipment, or portable mobile energy devices, etc., which will not be listed here.

[0136] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A battery cell, characterized in that, include: case; An electrode assembly is disposed within the housing. The electrode assembly has a first electrode end and a sidewall connected to the first electrode end. The first electrode end has a first region and a second region. A current collector is connected to the end of the first electrode, and along a first direction perpendicular to the current collector, the projection of the current collector on the end of the first electrode at least partially overlaps with the first region; An insulating component includes a first part, a second part, and a third part connected in sequence. The first part is connected to the side of the current collector disk opposite to the end of the first electrode along a first direction. The second part is inclined along a first direction. The third part is connected to the sidewall along a second direction perpendicular to the first direction. The distance between the third part and the current collector disk is 'a'. The thickness of the current collector disk along the first direction is 'b'. The length of the second part is 'c'. 'a', 'b', and 'c' satisfy... <c < a+b.

2. The battery cell according to claim 1, characterized in that, The second zone is disposed around the first zone.

3. The battery cell according to claim 1, characterized in that, The first portion is arranged around the collector plate, and the third portion is arranged around the side wall.

4. The battery cell according to claim 1, characterized in that, a, b, and c satisfy <c < a + 0.5b.

5. The battery cell according to claim 1, characterized in that, a satisfies 1mm≤a≤5mm.

6. The battery cell according to claim 5, characterized in that, a satisfies 2mm≤a≤4mm.

7. The battery cell according to claim 1, characterized in that, b satisfies 0.1mm≤b≤1mm.

8. The battery cell according to claim 7, characterized in that, b satisfies 0.2mm≤b≤0.5mm.

9. The battery cell according to claim 1, characterized in that, The collector plate is provided with a through hole, which extends through the collector plate along the first direction.

10. The battery cell according to claim 9, characterized in that, Along a second direction perpendicular to the first direction, the distance between the through hole and the second region is d, and along the first direction, the length of the projection of the first part on the collector plate in the second direction is e, satisfying d > e.

11. The battery cell according to claim 10, characterized in that, a and d satisfy a*d≤16mm².

12. The battery cell according to claim 10, characterized in that, e satisfies 2mm≤e≤4mm.

13. An electrical appliance, characterized in that, It includes a device body and a battery cell as described in any one of claims 1 to 12, wherein the battery cell is mounted on the device body.

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