Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a shell with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity, and the electrode assembly comprises a main body part and a tab part led out from the end part of at least one side of the main body part in the first direction; the insulating part is bonded with the electrode assembly and is used for insulating and isolating the inner wall of the accommodating cavity from the tab part; wherein the insulating part comprises a first insulating section and a second insulating section which are connected with each other, and the first insulating section covers at least part of the first end surface of the tab part in the first direction and also covers at least part of the surfaces of the two opposite sides of the tab part in the second direction; the second insulating section covers a second end face, close to one side of the inner wall of the accommodating cavity, of the tab part in a third direction and is bonded with the first insulating section, the second direction is crossed with the first direction, and the third direction is crossed with the second direction and the first direction.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Secondary batteries, especially lithium ion batteries, have the advantages of high voltage, large specific energy, long cycle life, green and pollution-free, wide working temperature range and small self-discharge, and are widely used in portable electronic devices and large new energy electric vehicles, which have great significance in solving human environmental pollution and energy crisis. With the wide application of lithium ion batteries, battery reliability has become a problem that producers are closely concerned about. CONTENT OF THE UTILITY MODEL

[0003] In one aspect of the present disclosure, a battery monomer is provided, comprising:

[0004] A shell having a receiving cavity;

[0005] An electrode assembly arranged in the receiving cavity, the electrode assembly comprising a main body portion and a tab portion extending from an end portion of at least one side of the main body portion in a first direction; and

[0006] An insulating member bonded to the electrode assembly for insulating and isolating the inner wall of the receiving cavity and the tab portion;

[0007] The insulating member comprises a first insulating segment and a second insulating segment connected to each other, the first insulating segment covers at least part of a first end surface of the tab portion in the first direction, and also covers at least part of the surface on opposite sides of the tab portion in a second direction, the second insulating segment covers a second end surface of the tab portion adjacent to one side of the inner wall of the receiving cavity in a third direction, and is bonded to the first insulating segment, the second direction intersects the first direction, and the third direction intersects both the second direction and the first direction.

[0008] In the present embodiment, the first insulating segment of the insulating member covers at least part of the first end surface of the tab portion in the first direction and at least part of the surface on opposite sides of the tab portion in the second direction, and the second insulating segment of the insulating member covers the second end surface of the tab portion adjacent to one side of the inner wall of the receiving cavity in the third direction, which can realize effective insulating and isolating effect between the tab portion and the inner wall of the shell. The bonding of the second insulating segment to the first insulating segment enables the first insulating segment and the second insulating segment to better cover the tab portion, reduces the possibility of the insulating member being warped and folded during the assembly of the battery monomer, reduces the risk of the position of the tab portion adjacent to the inner wall of the shell contacting the shell to cause internal short circuit of the electrode assembly or corrosion and thinning of the shell to cause liquid leakage, and is conducive to improving the reliability of the battery monomer.

[0009] In some embodiments, the second direction is perpendicular to the first direction, and the third direction is perpendicular to both the second direction and the first direction.

[0010] In the embodiment, the insulating member can effectively realize the insulation isolation of the tab part and the inner wall of the shell by the cladding of the tab part in the three mutually perpendicular directions.

[0011] In some embodiments, the first insulating segment extends from one end of the tab part to the other end along the third direction, the length of the first insulating segment along the third direction in the unfolded state of the insulating member is defined as a first length L1, the length of the main body part along the third direction is defined as a second length L2, and the first length L1 and the second length L2 satisfy: L1=L2.

[0012] In the embodiment, by equating the first length L1 of the first insulating segment along the third direction to the second length L2 of the main body part along the third direction, a more comprehensive cladding of the tab part along the third direction is realized, and such length is conducive to the first insulating segment and the main body part jointly forming the overall cladding of the tab part, improving the insulation isolation effect.

[0013] In some embodiments, the first insulating segment also clads the two sides of the end of the main body part adjacent to the tab part along the second direction, the second insulating segment is butt-jointed with the first insulating segment along the third direction, the length of the second insulating segment along the third direction in the unfolded state of the insulating member is defined as a third length L3, the thickness of the main body part along the second direction is defined as a first thickness T1, and the third length L3 and the first thickness T1 satisfy: L3>T1.

[0014] In the embodiment, by making the third length L3 of the second insulating segment greater than the first thickness T1 of the main body part along the second direction, the second insulating segment can more fully clad the second end surface of the tab part, and the length of the second insulating segment beyond the first thickness T1 can be used to bond the first insulating segment on the other side, so that the insulating member is less likely to be warped and folded during the assembly of the battery monomer, reducing the risk of internal short circuit of the battery monomer or corrosion and thinning of the shell to leak liquid, and further improving the reliability of the battery monomer.

[0015] In some embodiments, the third length L3 and the first thickness T1 satisfy: L3 / T1≥1.5.

[0016] In the embodiment, L3 is 1.5 times or more than T1, so that the second insulating segment obtains a length beyond the first thickness T1, which is conducive to increasing the bonding area of the part beyond the first thickness T1 to improve the bonding reliability.

[0017] In some embodiments, the position where the second insulating segment is butt-jointed with the first insulating segment along the third direction is located on one side of the tab part along the second direction, and the second insulating segment is bonded with the surface of the first insulating segment on the other side of the tab part along the second direction after bypassing the second end surface.

[0018] In the present embodiment, by bonding the second insulating section after bypassing the second end face, the bonded edge portion of the insulating member is located on the upper side of the second end face, so that when the electrode assembly with the insulating member is assembled into the case, the second insulating section extends from the lower side to the upper side, and when subjected to the upward pressing or scraping force of the opening end of the case, the bonding between the second insulating section and the first insulating section becomes tighter, thereby reducing the possibility of the second insulating section being folded or buckled.

[0019] In some embodiments, the first insulating section extends from one end of the tab portion to the other end in the third direction, the length of the first insulating section in the third direction in the unfolded state of the insulating member is defined as a first length L1, the length of the main body portion in the third direction is defined as a second length L2, and the first length L1 and the second length L2 satisfy: L1>L2.

[0020] In the present embodiment, by making the first length L1 of the first insulating section in the third direction greater than the second length L2 of the main body portion in the same direction, on the one hand, a more comprehensive covering effect of the tab portion in the third direction is achieved, and on the other hand, the first insulating section can have an overhanging portion to assist the second insulating section in covering the second end face.

[0021] In some embodiments, the first insulating section also covers both sides of the end portion of the main body portion adjacent to the tab portion in the second direction, the thickness of the main body portion in the second direction is defined as a first thickness T1, and the first length L1, the second length L2 and the first thickness T1 satisfy: L1≥L2+0.5*T1.

[0022] In the present embodiment, by making the overhanging size of the first insulating section not less than 0.5 times the thickness of the main body portion, the overhanging portion of the first insulating section also participates in the covering of the second end face, improving the insulation isolation effect of the second end face relative to the inner wall of the case.

[0023] In some embodiments, the first insulating section has an overhanging portion relative to the main body portion in the third direction, the overhanging portion bonds at least part of the second end face, the second insulating section is in abutment with the first insulating section in the third direction, and at least part of the second insulating section covers the second end face by bonding with the overhanging portion.

[0024] In the present embodiment, by bonding at least part of the second end face with the overhanging portion of the first insulating section relative to the main body portion, and making at least part of the second insulating section cover the second end face by bonding with the overhanging portion, a multi-layer stacked insulation structure can be formed on the second end face, thereby further improving the insulation isolation effect of the second end face relative to the inner wall of the case, and also improving the strength of the insulating member at this position, reducing the risk of the tab portion piercing the insulating member at this position.

[0025] In some embodiments, the overhanging portion includes at least one of a first overhanging section overhanging the first end surface in the third direction, a second overhanging section overhanging a surface of the tab portion on one side of the second direction in the third direction, and a third overhanging section overhanging a surface of the tab portion on the other side of the second direction in the third direction.

[0026] In the present embodiment, by the overhanging portion overhanging the overhanging section of at least one of the first end surface, the third end surface, and the fourth end surface, it is advantageous to form a multi-layer stacked insulation structure at a corresponding position of the second end surface of the tab as needed, thereby improving the flexibility of the insulation member arrangement.

[0027] In some embodiments, the position where the second insulation section abuts the first insulation section in the third direction is located at the second end surface, and the second insulation section is bonded to the first insulation section on the surface of the tab portion on the other side of the second direction after passing by the second end surface.

[0028] In the present embodiment, by locating the position where the second insulation section abuts the first insulation section in the third direction at the second end surface, and bonding the second insulation section to the first insulation section on the surface of the tab portion on the other side after passing by the second end surface, a multi-layer stacked insulation structure can be formed at the second end surface of the tab portion, further improving the insulation isolation effect and strength in this area.

[0029] In some embodiments, the first insulation section and the second insulation section are an integral structure.

[0030] In the present embodiment, by making the first insulation section and the second insulation section an integral structure, the manufacturing and assembly of the insulation member relative to the electrode assembly can be simplified, and the formed structure is more stable and reliable.

[0031] In some embodiments, the insulation member includes an insulation tape.

[0032] In the present embodiment, by using the insulation tape to cover and adhere the electrode assembly, a more reliable assembly effect can be achieved, and the process can be saved and the efficiency can be improved.

[0033] In one aspect of the present disclosure, a battery device is provided, comprising: the aforementioned battery cell.

[0034] The battery employing the above-mentioned battery cell embodiment can improve reliability.

[0035] In one aspect of the present disclosure, a power consuming device is provided, comprising: the aforementioned battery device.

[0036] The power consuming device employing the above-mentioned battery device embodiment can improve reliability. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0038] The present disclosure can be more clearly understood with reference to the following detailed description together with the accompanying drawings, in which:

[0039] Figure 1 is a structural schematic diagram of some embodiments of the battery device according to the present disclosure;

[0040] Figure 2 is an exploded schematic diagram of some embodiments of the battery device according to the present disclosure;

[0041] Figure 3 is an assembled structural schematic diagram of some embodiments of the battery cell according to the present disclosure;

[0042] Figure 4 is Figure 3 is an exploded structural schematic diagram of the embodiment shown in

[0043] Figure 5 is a structural schematic diagram of the electrode assembly in some embodiments of the battery cell according to the present disclosure;

[0044] Figure 6 is a dimensional relationship schematic diagram of the insulation member in an unfolded state and the electrode assembly in some embodiments of the battery cell according to the present disclosure;

[0045] Figure 7 (a) and (c) of are schematic diagrams of different folded states of the insulation member in some embodiments of the battery cell according to the present disclosure, respectively;

[0046] Figure 7 (b) and (d) of Figure 7 are schematic diagrams of the assembly of the insulation member and the electrode assembly shown in (a) and (c) of

[0047] Figure 8 is a dimensional relationship schematic diagram of the insulation member in an unfolded state and the electrode assembly in other embodiments of the battery cell according to the present disclosure;

[0048] Figure 9 (a) of is a schematic diagram of the insulation member in other embodiments of the battery cell according to the present disclosure;

[0049] Figure 9 (b)-(h) of Figure 9 are schematic diagrams of the assembly process of the insulation member and the electrode assembly shown in (a) of at different viewing angles.

[0050] It should be understood that the dimensions of the various parts shown in the drawings are not drawn to scale. In addition, the same or similar reference numerals are used to represent the same or similar parts throughout the specification.

[0051] BRIEF DESCRIPTION OF DRAWINGS

[0052] 11, housing; 12, end cap; 13, first pole post; 14, second pole post; 15, first connecting piece; 16, second connecting piece; 17, pressure relief mechanism; 18, liquid injection valve; 181, sealing spike; 182, plug; 183, liquid injection hole;

[0053] 20, electrode assembly; 21, main body portion; 22, tab portion; 221, first end surface; 222, second end surface; 223, third end surface; 224, fourth end surface;

[0054] 30, insulating member; 31, first insulating section; 312, overhanging portion; 3121, first overhanging section; 3122, second overhanging section; 3123, third overhanging section; 32, second insulating section;

[0055] 40, battery device; 41, battery cell; 42, case;

[0056] 50, vehicle; 51, controller; 52, motor; 53, axle; 54, wheel;

[0057] dr1, first direction; dr2, second direction; dr3, third direction. DETAILED DESCRIPTION

[0058] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0059] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "include" and "have" and any variations thereof in the specification and claims of the present disclosure and the above description of drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of the present disclosure, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0061] Reference to "an embodiment" or "the embodiments" in this disclosure means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described in this disclosure can be combined with each other in their various permutations and combinations.

[0062] In the description of the embodiments of the disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, if the character " / " appears in the disclosure, it generally means that the front and rear associated objects are in an "or" relationship.

[0063] In the description of the embodiments of the disclosure, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0064] In the description of the embodiments of the disclosure, the term "at least one" refers to one or more than two (including two), and similarly, "at least one group" refers to one group or more than two groups (including two groups), and "at least one piece" refers to one piece or more than two pieces (including two pieces). In the description of the embodiments of the disclosure, the term "at least part" refers to part or all.

[0065] Unless specifically stated, in the description of the embodiments of the disclosure, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0066] In the description of the embodiments of the disclosure, unless otherwise specifically stated and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0067] In this embodiment of the disclosure, a battery device refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. A battery cell is the smallest unit constituting a battery device. A battery cell includes electrode components capable of undergoing electrochemical reactions. A battery cell can be a rechargeable battery, meaning a battery cell that can be recharged after discharge to activate its active materials and continue to be used.

[0068] The battery cells of this disclosure are applicable to various battery devices. A battery device may include a housing and battery cells, the housing providing space for the battery cells, which are then mounted inside the housing. The housing may be made of metal. The battery cell is the smallest unit constituting a battery device. The battery cell includes electrode components capable of undergoing electrochemical reactions.

[0069] The battery device disclosed in this embodiment is applicable to various electrical devices that use battery devices. These electrical devices can be mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; and 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. This disclosure does not impose any particular limitation on the aforementioned electrical devices. The battery device can be used to power electrical devices such as vehicles, for example, to provide power for vehicle operation or driving.

[0070] In some related technologies, after the leads are soldered onto the electrode assembly of the battery cell, tab protective adhesive is pasted on the outside of the tab. The tab protective adhesive is used to prevent the tab from contacting the battery cell casing and corroding the casing, and to reduce the risk of internal short circuits in the battery cell.

[0071] Research has revealed that during the assembly of battery cells, the electrode assembly needs to be pushed into the housing from the open end. At this time, the tab protective adhesive attached to the end of the electrode assembly near the housing may be scraped or squeezed by the open end due to not being tightly adhered, causing it to lift or fold. This means that the tab is not effectively covered by the tab protective adhesive, which may come into contact with the inner wall of the housing, leading to risks such as internal short circuits of the electrode assembly or corrosion and thinning of the housing and leakage, thus affecting the reliability of the battery cell.

[0072] In view of this, the present disclosure provides a battery cell, a battery device, and an electrical device that can improve reliability.

[0073] In one aspect of this disclosure, a battery cell is provided, comprising:

[0074] The shell has a receiving cavity;

[0075] An electrode assembly, disposed within a receiving cavity, includes a main body and an electrode tab extending from at least one end of the main body in a first direction; and

[0076] An insulating component, bonded to the electrode assembly, used to insulate and isolate the inner wall of the receiving cavity and the electrode lugs;

[0077] The insulating component includes a first insulating segment and a second insulating segment connected to each other. The first insulating segment covers at least a portion of the first end face of the electrode tab in a first direction and also covers at least a portion of the surfaces of the electrode tab on opposite sides in a second direction. The second insulating segment covers the second end face of the electrode tab on the side adjacent to the inner wall of the receiving cavity in a third direction and is bonded to the first insulating segment. The second direction intersects the first direction, and the third direction intersects both the second and first directions.

[0078] In this embodiment, by covering at least a portion of the first end face of the tab in the first direction and at least a portion of the opposite sides in the second direction with the first insulating segment of the insulating member, and by covering the second end face of the tab on the side adjacent to the inner wall of the receiving cavity in the third direction with the second insulating segment of the insulating member, effective insulation and isolation between the tab and the inner wall of the housing can be achieved. The bonding between the second insulating segment and the first insulating segment allows the first and second insulating segments to better maintain the covering of the tab, reducing the possibility of the insulating member lifting and folding during the assembly of the battery cell, reducing the risk of the tab coming into contact with the inner wall of the housing and causing internal short circuits in the electrode assembly or corrosion and thinning of the housing and leakage, which is beneficial to improving the reliability of the battery cell.

[0079] Figure 1 This is a schematic diagram of the structure of some embodiments of the electrical device according to this disclosure. For convenience, a vehicle is used as an example for explanation. Reference Figure 1 Vehicle 50 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles or hybrid vehicles, etc. A battery device 40 can be installed at the bottom, front, or rear of vehicle 50.

[0080] The battery device 40 can be used to power the vehicle 50. For example, the battery device 40 can serve as the operating power source for the vehicle 50's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 50. The battery device 40 can not only serve as the operating power source for the vehicle 50, but also as the driving power source for the vehicle 50, replacing or partially replacing fuel or natural gas to provide propulsion for the vehicle 50.

[0081] The interior of vehicle 50 may also include an axle 53, wheels 54, a motor 52, and a controller 51. The controller 51 controls the power supply from the battery device 40 to the motor 52. For example, when vehicle 50 uses the battery device 40 as its drive power source, the battery device 40 replaces or partially replaces fuel or natural gas to provide the motor 52 with the power required for constant speed and acceleration. The motor 52 drives the axle 53 to rotate, thereby rotating the wheels 54.

[0082] Figure 2 This is an exploded view of some embodiments of the battery device according to the present disclosure. (See reference) Figure 2 In some embodiments, the battery device 40 includes a battery cell 41 and a housing 42. The housing 42 may include a casing and a cover that covers the opening side of the casing. The casing and cover provide housing space for the battery cell 41 and provide functions such as sealing and impact protection, and can also prevent liquids or other foreign objects from adversely affecting the charging, discharging or safety of the battery module.

[0083] The housing 42 can be made of metal, non-metal, or a mixture of materials. The shell and lid can be of various shapes, such as cuboids or cylinders. The shell can be a hollow structure open on one side, and the lid can also be a hollow structure open on one side; the open side of the lid fits over the open side of the shell to form the internal storage space. In other embodiments, the lid is a plate-like structure that fits over the open side of the shell to form the internal storage space.

[0084] The battery cell 41 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 this embodiment does not limit it.

[0085] In some embodiments, the battery device 40 may include a plurality of battery cells 41, which may be arranged within a housing 42 along at least one of the length and width directions of the housing 42. At least one row of battery cells 41 may be provided as needed. Alternatively, one or more layers of battery cells 41 may be provided along the height direction of the battery device 40 as required.

[0086] The individual battery cells 41 are electrically connected, such as in series, parallel, or a combination thereof, to achieve the required electrical performance parameters of the battery device 40. A combination thereof refers to multiple battery cells 41 being connected in both series and parallel. Adjacent battery cells 41 can be electrically connected through busbars. Multiple battery cells 41 are arranged in rows, and one or more rows of battery cells 41 can be arranged inside the housing 42 as needed.

[0087] In some embodiments, multiple battery cells 41 may first be connected in series, parallel, or in a mixed manner to form a battery module, and then the multiple battery modules may be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 42. In other embodiments, all battery cells 41 are directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 41 is housed within the housing 42.

[0088] Figure 3 This is a schematic diagram of the assembly structure of some embodiments of the battery cell according to the present disclosure. Figure 4 yes Figure 3 The exploded structure diagram of the embodiment shown is illustrated. Figure 5 This is a schematic diagram of the electrode assembly structure according to some embodiments of the battery cell of this disclosure. Figure 6 This is a schematic diagram showing the dimensional relationship between the insulating element and the electrode assembly in the unfolded state in some embodiments of the battery cell according to this disclosure.

[0089] refer to Figures 3-6 This disclosure provides a battery cell 41, including a housing 11, an electrode assembly 20, and an insulating member 30. The housing 11 has a receiving cavity. The electrode assembly 20 is disposed within the receiving cavity and includes a main body 21 and a tab 22 extending from at least one end of the main body 21 in a first direction dr1. The insulating member 30 is bonded to the electrode assembly 20 and serves to insulate and isolate the inner wall of the receiving cavity and the tab 22. The insulating member 30 includes a first insulating segment 31 and a second insulating segment 32 connected to each other. The first insulating segment 31 covers at least a portion of the first end face 221 of the tab 22 in the first direction dr1 and also covers at least a portion of the surfaces of the tab 22 on opposite sides in the second direction dr2. The second insulating segment 32 covers the second end face 222 of the tab 22 on the side adjacent to the inner wall of the receiving cavity in the third direction dr3 and is bonded to the first insulating segment 31. The second direction dr2 intersects the first direction dr1, and the third direction dr3 intersects both the second direction dr2 and the first direction dr1.

[0090] As an example, the battery cell 41 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include square battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0091] The housing 11 can be used to encapsulate the electrode assembly 20 and electrolyte, etc. The housing 11 can be a steel housing, an aluminum housing, a composite metal housing (such as a copper-aluminum composite housing), etc. (Reference) Figure 3 and Figure 4The battery cell 41 may also include an end cap 12, which covers the opening of the housing 11. A first terminal 13, a second terminal 14, a pressure relief mechanism 17, and a liquid injection valve 18 may be disposed on the end cap 12. The first terminal 13 may be electrically connected to the tab 22 on one side of the electrode assembly 20 via a first connector 15, and the second terminal 14 may be electrically connected to the tab 22 on the other side of the electrode assembly 20 via a second connector 16.

[0092] The first terminal 13 and the second terminal 14 may have opposite polarities and are used to connect to external conductive components, respectively. The first connector 15 and the second connector 16 may both be made of conductive materials such as metal or alloy to achieve electrical connection between the terminal and the tab. The first connector 15 and the second connector 16 may be fixedly connected to the tabs 22 on both sides of the electrode assembly 20 by welding. In some embodiments, the battery cell 41 may not include the first connector 15 or the second connector 16, so that the first terminal 13 or the second terminal 14 can be directly welded to the tab 22.

[0093] The pressure relief mechanism 17 refers to an element or component that is activated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 41 reaches a predetermined threshold. This threshold design varies depending on design requirements. The threshold may depend on one or more materials among the positive electrode, negative electrode, electrolyte, and separator in the battery cell 41. The pressure relief mechanism 17 can take the form of an explosion-proof valve, gas valve, pressure relief valve, or safety valve, and can specifically employ pressure-sensitive or temperature-sensitive elements or structures. That is, when the internal pressure or temperature of the battery cell 41 reaches the predetermined threshold, the pressure relief mechanism 17 actuates, or a weak structure in the pressure relief section is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature.

[0094] The electrolyte injection valve 18 can be used to inject electrolyte into the battery cell 41. Figure 4 In this design, the electrolyte filling valve 18 may include an electrolyte filling hole 183, a plug 182, and a sealing pin 181. The plug 182 is inserted into the electrolyte filling hole 183 to prevent electrolyte leakage. The sealing pin 181 is fixed to the upper side of the plug 182 to prevent external contaminants from entering the battery cell.

[0095] The electrode assembly 20 may include a first electrode and a second electrode with opposite polarities, and a separator disposed between the first electrode and the second electrode. In some embodiments, the first electrode is a positive electrode and the second electrode is a negative electrode. In other embodiments, the first electrode is a negative electrode and the second electrode is a positive electrode. During the charging and discharging process of a single battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode. The separator, disposed between the positive and negative electrode, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0096] In some embodiments, the positive electrode may include a positive current collector substrate and a positive active material layer disposed on at least one surface of the positive current collector substrate.

[0097] As an example, the positive electrode current collector substrate has two surfaces opposite each other in its own thickness direction, and the positive electrode active material layer is disposed on either or both of the two opposite surfaces of the positive electrode current collector substrate.

[0098] As an example, the positive electrode current collector substrate can be a metal foil or a composite current collector. For example, as a metal foil, silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc., can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by applying a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) onto a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive electrode active material layer may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this disclosure is not limited to these materials, and other conventional materials that can be used as positive electrode active material layers in batteries may also be used. These positive electrode active material layers 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 iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0100] In some embodiments, the negative electrode sheet may include a negative current collector substrate.

[0101] As an example, the negative electrode current collector substrate 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. 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 applying a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) onto a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0102] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.

[0103] As an example, the negative electrode current collector substrate has two surfaces opposite each other in its own thickness direction, and the negative electrode active material layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector substrate.

[0104] As an example, the negative electrode active material layer may employ a type of negative electrode active material layer known in the art for use in battery cells. As an example, the negative electrode active material layer 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. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this disclosure is not limited to these materials, and other conventional materials that can be used as negative electrode active material layers in batteries may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0105] In some embodiments, the positive electrode current collector substrate can be made of aluminum, and the negative electrode current collector substrate can be made of copper.

[0106] In some embodiments, the separator is a separator membrane. This disclosure 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.

[0107] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrode plates, or it can be located between the positive and negative electrode plates while being attached to the surface of the positive electrode plate and / or the surface of the negative electrode plate.

[0108] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrode plates, serving both to transport ions and to isolate the positive and negative electrodes.

[0109] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0110] As an example, liquid electrolytes include electrolyte salts and solvents.

[0111] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0112] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0113] As an example, gel electrolytes include a polymer-based backbone network combined with an ionic liquid—a lithium salt.

[0114] As an example, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0115] As an example, polymer solid electrolytes can be polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0116] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0117] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0118] The electrode assembly 20 includes a main body 21 that can be a wound structure formed by winding a positive electrode, a negative electrode, and a separator, or a stacked structure formed by overlapping positive electrode, negative electrode, and a separator. One or more positive and negative electrode sheets can be provided respectively. As an example, multiple positive electrode sheets and multiple negative electrode sheets are alternately arranged along the electrode thickness direction.

[0119] In some embodiments, the main body 21 may be cylindrical, flat, or polygonal. A tab 22 may be led out from one or both ends of the main body 21 in the first direction dr1. Corresponding to the positive and negative electrode sheets, the led-out tab 22 may include a positive tab and a negative tab. The positive tab can be formed by cutting or trimming the current collector substrate of the positive electrode sheet, or it can be connected to the side of the current collector substrate of the positive electrode sheet by welding. The negative tab can be formed by cutting or trimming the current collector substrate of the negative electrode sheet, or it can be connected to the side of the current collector substrate of the negative electrode sheet by welding.

[0120] exist Figure 5 In the middle, the second direction dr2 intersects the first direction dr1, and the third direction dr3 intersects both the second direction dr2 and the first direction dr1. Here, "intersection" refers to the presence of an angle between the two directions, which can be a right angle, an acute angle, or an obtuse angle. The main body 21 has tabs 22 on both sides of the first direction dr1. Here, we take... Figure 5 The leftmost electrode tab 22 is used as an example for explanation. The middle part of the electrode tab 22 on the third direction dr3 can be smaller than the two ends on the second direction dr2, which illustrates the effect of welding the multi-layer electrode tabs in this part to the first connector 15.

[0121] As can be seen, the tab portion 22 extends outward relative to the main body portion 21 along the first direction dr1, and has a certain width and height in the second direction dr2 and the third direction dr3, respectively. When placed... Figure 4 In the case of the housing 11 shown, the lower end surface of the tab 22 (i.e., the second end face 222) is adjacent to the bottom inner wall of the housing 11. The first end face 221 of the tab 22 in the first direction dr1 and the third end face 223 and the fourth end face 224 opposite in the second direction dr2 are respectively adjacent to the inner walls of the three sides of the housing 11. Here, each end face of the tab 22 can be a plane, an arc surface, or a combination of a plane and an arc surface.

[0122] exist Figure 6 In the diagram, the insulating member 30 on the left is in an unfolded state, illustrating the relative positions of the first insulating section 31 and the second insulating section 32. To achieve insulation between the tab 22 and the housing 11, the first insulating section 31 covers at least a portion of the first end face 221 of the tab 22, and also covers at least a portion of the surfaces of the third end face 223 and the fourth end face 224 on opposite sides of the tab 22 in the second direction dr2. The second insulating section 32 covers the second end face 222 of the tab 22.

[0123] The covering relationship here is mainly reflected in the shielding effect based on projection. For example, the orthographic projection of the first insulating segment 31 in the first direction dr1 completely includes at least a portion of the orthographic projection of the first end face 221 in the first direction dr1, thereby effectively shielding the first end face 221 in the first direction dr1. Similarly, the orthographic projection of the first insulating segment 31 in the second direction dr2 completely includes at least a portion of the surfaces of the third end face 223 and the fourth end face 224 in the second direction dr2, and the orthographic projection of the second insulating segment 32 in the third direction dr3 completely includes the orthographic projection of the second end face 222 in the third direction dr3. The covering relationship here can be that the two are bonded and fixed, or that the two are in contact but not fixed, or that the two are not in contact but have a gap, or that there are other intermediate components between the two, etc.

[0124] In this embodiment, by covering at least a portion of the first end face 221 of the tab 22 in the first direction dr1 and at least a portion of the opposite sides of the surface in the second direction dr2 with the first insulating segment 31 of the insulating member 30, and by covering the second end face 222 of the tab 22 on the side adjacent to the inner wall of the receiving cavity in the third direction dr3 with the second insulating segment 32 of the insulating member 30, effective insulation and isolation between the tab 22 and the inner wall of the housing 11 can be achieved. The bonding between the second insulating segment 32 and the first insulating segment 31 allows the first insulating segment 31 and the second insulating segment 32 to better maintain the covering of the tab 22, reducing the possibility of the insulating member 30 lifting and folding during the assembly of the battery cell 41, reducing the risk of the tab coming into contact with the inner wall of the housing 11 and causing internal short circuits in the electrode assembly or corrosion and thinning of the housing 11 and leakage, which is beneficial to improving the reliability of the battery cell 41.

[0125] refer to Figures 4-6 In some embodiments, the second direction dr2 is perpendicular to the first direction dr1, and the third direction dr3 is perpendicular to both the second direction dr2 and the first direction dr1.

[0126] Here, the first direction dr1, the second direction dr2, and the third direction dr3 can correspond to the width, thickness, and height of the battery cell 41, respectively. By covering the tab 22 in these three mutually perpendicular directions with the insulating member 30, the tab 22 can be effectively insulated from the inner wall of the housing 11.

[0127] refer to Figure 6 In some embodiments, the first insulating segment 31 extends from one end of the tab portion 22 to the other end along the third direction dr3. The length of the first insulating segment 31 along the third direction dr3 in the state where the insulating member 30 is unfolded is defined as the first length L1, and the length of the main body portion 21 along the third direction dr3 is defined as the second length L2. The first length L1 and the second length L2 satisfy: L1=L2.

[0128] exist Figure 6 In the image, the left side shows the unfolded insulating member 30, and the right side shows the tab portion 22 and the main body portion 21 as seen from the first direction dr1. Here, the first insulating segment 31 can be configured as a rectangle, extending from the lower end to the upper end of the tab portion 22 along the third direction dr3. The second insulating segment 32 can also be configured as a rectangle, protruding relative to the first insulating segment 31 along the third direction dr3. In other embodiments, the first insulating segment 31 and the second insulating segment 32 can be configured as other shapes, not limited to rectangles.

[0129] In this embodiment, by making the first length L1 of the first insulating segment 31 in the third direction dr3 equal to the second length L2 of the main body 21 in the same direction, a more comprehensive covering effect on the tab 22 in the third direction dr3 is achieved. Moreover, such a length is beneficial for the first insulating segment 31 and the main body 21 to jointly form an overall covering of the tab 22, thereby improving the insulation and isolation effect.

[0130] Figure 7 (a) and (c) are schematic diagrams of different folding states of the insulating element in some embodiments of the battery cell according to the present disclosure. Figure 7 (b) and (d) are respectively Figure 7 Schematic diagrams of the assembly of the insulating component and the electrode assembly shown in (a) and (c).

[0131] refer to Figure 6 and Figure 7 In some embodiments, the first insulating segment 31 also covers the ends of the main body 21 adjacent to the tab 22 on both sides of the second direction dr2. The second insulating segment 32 and the first insulating segment 31 are connected on the third direction dr3. The length of the second insulating segment 32 along the third direction dr3 in the state where the insulating member 30 is unfolded is defined as the third length L3. The thickness of the main body 21 along the second direction dr2 is defined as the first thickness T1. The third length L3 and the first thickness T1 satisfy: L3>T1.

[0132] The first insulating section 31 can cover both sides of the end of the main body 21 by bonding it to the surfaces of both sides of the end of the main body 21, or by bonding it to other insulating components (such as insulating films) disposed outside the main body 21. Figure 7 In (a), refer to Figure 6 The schematic diagram shows an arc with an arrow, indicating that the first insulating segment 31 can be folded into a U-shaped cross-section so that... Figure 7 (b) covers both ends of the tab portion 22 and the main body portion 21.

[0133] exist Figure 6 and Figure 7 In the image, it can be seen that the second insulating segment 32 and the first insulating segment 31 are connected on the third-direction dr3, and the connection position is already visible. Figure 6 The second insulating segment 32 and the first insulating segment 31 can be an integral structure, for example, cut from a whole insulating film; or they can be made separately and then fixed together by tape, ultrasound or heat fusion.

[0134] The second insulation section 32 can be referenced. Figure 7 (c) and (d) and Figure 6The curved line with the arrowhead bends relative to the first insulating section 31 at the docking position, thereby sealing the U-shaped structure formed by the first insulating section 31 from the bottom, thus covering the second end face of the tab 22. At this time, the length of the second insulating section 32 along the third direction dr3 is converted into the dimension along the second direction dr2. By making the third length L3 of the second insulating section 32 greater than the first thickness T1 of the main body along the second direction dr2, the second insulating section 32 can more fully cover the second end face of the tab 22. Furthermore, the length of the second insulating section 32 exceeding the first thickness T1 can be used to bond the first insulating section 31 on the other side. This makes the insulating component 30 less likely to warp or fold during the assembly of the battery cell 41, reducing the risk of internal short circuits in the battery cell 41 or corrosion and thinning of the casing 11 and leakage, which is beneficial to further improving the reliability of the battery cell 41.

[0135] In some embodiments, the third length L3 and the first thickness T1 satisfy: L3 / T1≥1.5.

[0136] In this embodiment, L3 is more than 1.5 times T1, which allows the second insulating segment 32 to have a length that exceeds the first thickness T1, which is beneficial to increase the bonding area of ​​the excess part and improve the bonding reliability.

[0137] refer to Figure 7 In some embodiments, the second insulating segment 32 and the first insulating segment 31 are positioned on one side of the tab 22 in the second direction dr2 at the third direction dr3. After the second insulating segment 32 passes around the second end face 222, it is bonded to the surface of the first insulating segment 31 on the other side of the tab 22 in the second direction dr2.

[0138] exist Figure 7 and Figure 8 In (b), relative to the first insulating segment 31 folded into a U-shape, the second insulating segment 32 connects to the first insulating segment 31 on one side of the first insulating segment 31, and the second insulating segment 32 is bent and passes over the second end face from the underside of the tab 22, then bends upward and adheres to the other side surface of the first insulating segment 31, thereby forming Figure 8 The structure shown in (d) is as follows.

[0139] In this embodiment, by bonding the second insulating segment 32 to the first insulating segment 31 after bypassing the second end face 222, the bonding edge of the insulating member 30 is located on the upper side of the second end face 222. Thus, when the electrode assembly 20 with the insulating member 30 installed is installed into the housing 11, the second insulating segment 32 extends from bottom to top. When subjected to upward squeezing or scraping force from the open end of the housing 11, it is easier to make the bonding between the second insulating segment 32 and the first insulating segment 31 tighter, thereby reducing the possibility of the second insulating segment 32 folding or lifting up.

[0140] Figure 8 This is a schematic diagram comparing the dimensional relationship between the insulating element and the electrode assembly in the unfolded state in some other embodiments of the battery cell according to this disclosure. (See reference) Figure 9 In some embodiments, the first insulating segment 31 extends from one end of the tab portion 22 to the other end along the third direction dr3. The length of the first insulating segment 31 along the third direction dr3 in the state where the insulating member 30 is unfolded is defined as the first length L1, and the length of the main body portion 21 along the third direction dr3 is defined as the second length L2. The first length L1 and the second length L2 satisfy: L1>L2.

[0141] exist Figure 9 In the middle, the left side shows the unfolded insulating member 30, and the right side shows the tab 22 and the main body 21 as seen from the first direction dr1. Here, the first insulating section 31 can be set as a rectangle, extending from the lower end to the upper end of the tab 22 along the third direction dr3.

[0142] In this embodiment, by making the first length L1 of the first insulating segment 31 in the third direction dr3 greater than the second length L2 of the main body 21 in that direction, on the one hand, a more comprehensive covering effect of the tab portion 22 on the third direction dr3 can be achieved, and on the other hand, the first insulating segment 31 can have an extended portion 312 to assist the second insulating segment 32 in covering the second end face 222.

[0143] Figure 9 (a) is a schematic diagram of the insulation element in some other embodiments of the battery cell according to the present disclosure. Figure 8 (b)-(h) are respectively Figure 9 (a) is a schematic diagram of the assembly process of the insulating component and electrode assembly from different perspectives.

[0144] refer to Figure 9 and Figure 8 In some embodiments, the first insulating segment 31 also covers the end of the main body 21 adjacent to the tab 22 on both sides of the second direction dr2. The thickness of the main body 21 along the second direction dr2 is defined as the first thickness T1. The first length L1, the second length L2 and the first thickness T1 satisfy: L1≥L2+0.5*T1.

[0145] The first insulating section 31 can cover both sides of the end of the main body 21 by bonding it to the surfaces of both sides of the end of the main body 21, or by bonding it to other insulating components (such as insulating films) disposed outside the main body 21. Figure 9 In (a), refer to Figure 8 The schematic diagram shows an arc with an arrow, indicating that the first insulating segment 31 can be folded into a U-shaped cross-section so that... Figure 9 (b) covers both ends of the tab portion 22 and the main body portion 21.

[0146] In this embodiment, by making the length of the first insulating segment 31 greater than that of the main body 21 by at least 0.5 times the thickness of the main body 21, the extended portion of the first insulating segment 31 can also participate in the covering effect of the second end face 222, thereby improving the insulation and isolation effect of the second end face 222 relative to the inner wall of the housing.

[0147] refer to Figure 8 and Figure 8 In some embodiments, the first insulating segment 31 has an overhang 312 on the third-direction dr3 relative to the tab 22, the overhang 312 being bonded to at least a portion of the second end face 222, the second insulating segment 32 being mated to the first insulating segment 31 on the third-direction dr3, and at least a portion of the second insulating segment 32 covering the second end face 222 by bonding with the overhang 312.

[0148] exist Figure 9 The extended portion 312 of the first insulating segment 31 relative to the main body 21 is indicated by a double-dotted line. Here, the second insulating segment 32 and the first insulating segment 31 can be an integral structure, for example, cut from a whole insulating film; or they can be made separately and then fixed together by tape, ultrasound, or heat fusion.

[0149] In this embodiment, at least a portion of the second end face 222 is bonded to the first insulating segment 31 relative to the extended portion 312 of the main body 21, and at least a portion of the second insulating segment 32 covers the second end face 222 by bonding with the extended portion 312. This allows the formation of a multi-layered stacked insulating structure on the second end face 222, thereby further improving the insulation isolation effect of the second end face 222 relative to the inner wall of the housing, and also improving the strength of the insulating member at this location, reducing the risk of the tab 22 puncturing the insulating member 30 at this location.

[0150] refer to Figure 8 and Figure 9In some embodiments, the extended portion 312 includes at least one of a first extended segment 3121, a second extended segment 3122, and a third extended segment 3123. The first extended segment 3121 extends beyond the first end face 221 in the third direction dr3, the second extended segment 3122 extends beyond the surface of the tab 22 on one side in the second direction dr2 in the third direction dr3, and the third extended segment 3123 extends beyond the surface of the tab 22 on the other side in the second direction dr2 in the third direction dr3.

[0151] exist Figure 9 In the original text, the extended portion 312 is rectangular and divided into a first extended segment 3121, a second extended segment 3122, and a third extended segment 3123 by a double-dotted line. In other embodiments, the extended portion 312 may include only one or two of the first extended segment 3121, the second extended segment 3122, and the third extended segment 3123. These three extended segments may cover the sides of the second end face 222 that are adjacent to the first end face 221, the third end face 223, and the fourth end face 224, respectively, and extend to the inside of the second end face 222.

[0152] Figure 9 (c), (e), and (g) illustrate the states in which the second extension segment 3122, the first extension segment 3121, and the third extension segment 3123 cover the three directional sides of the second end face 222, respectively. Since the third extension segment 3123 is connected to the second insulating segment 32, the second insulating segment 32, together with the third extension segment 3123, covers at least a portion of the second end face 222, and the second insulating segment 32 can continue to extend upward after bypassing the second end face 222 and adhere to the first insulating segment 31.

[0153] In this embodiment, the extended portion 312 extends beyond at least one of the first end face 221, the third end face 223, and the fourth end face 224, which facilitates the formation of a multi-layered stacked insulation structure at the corresponding position of the second end face 222 of the tab portion 22 as needed, thereby improving the flexibility of the insulation component arrangement.

[0154] refer to Figure 9 In some embodiments (a)-(h), the second insulating segment 32 and the first insulating segment 31 are located at the second end face 222 on the third direction dr3, and the second insulating segment 32 is bonded to the surface of the first insulating segment 31 on the other side of the tab portion 22 on the second direction dr2 after bypassing the second end face 222.

[0155] When installing the insulating component 30, refer to Figure 9 (a) First, the first insulating segment 31 can be folded into a U-shape, with the protruding portion 312 and the second insulating segment 32 located on the lower side. Then, refer to Figure 9(b) allows the first insulating section 31 to be fitted onto the outside of the tab 22 from the side. (See reference) Figure 9 (c) and (d) allow the second protruding segment 3122 of the protruding portion 312 to be bent to adhere to the side of the second end face 222 of the electrode lug 22. See also... Figure 4 (e) and (f) allow the first extended segment 3121 adjacent to the second extended segment 3122 to be bent to adhere to the other side of the second end face 222 of the pole lug 22. Then, refer to Figure 6 (g) and (h) allow the third extension segment 3123 and the second insulating segment 32 to be bent together and bonded to the second end face 222 of the electrode lug 22. At this time, the mating position of the third extension segment 3123 and the second insulating segment 32 is located at the second end face 222. The second insulating segment 32 extends upward after passing around the second end face 222 and is bonded and fixed to the first insulating segment 31.

[0156] In this embodiment, by positioning the second insulating segment 32 and the first insulating segment 31 at the second end face 222 on the third direction dr3, and by bonding the second insulating segment 32 to the first insulating segment 31 on the other side surface of the tab 22 after bypassing the second end face 222, a multi-layered stacked insulating structure can be formed on the second end face 222 of the tab 22. This further improves the insulation isolation effect of the second end face 222 relative to the inner wall of the housing, and also increases the strength of the insulating component at this position, reducing the risk of the tab 22 puncturing the insulating component 30 at this position.

[0157] In some embodiments, the first insulating segment 31 and the second insulating segment 32 are an integral structure.

[0158] In this embodiment, by making the first insulating segment 31 and the second insulating segment 32 an integral structure, the manufacturing of the insulating component 30 and its assembly relative to the electrode assembly 20 can be simplified, making the resulting structure more stable and reliable.

[0159] In some embodiments, the insulating element 30 includes insulating tape.

[0160] The bonding of the insulating component 30 to the tab portion 22, the main body portion 21, and other parts thereof can be achieved by applying adhesive or by directly using insulating tape. The insulating tape may include a substrate layer and an adhesive layer attached to the surface of the substrate layer. The substrate layer may be made of materials such as polyethylene terephthalate (PET), and the adhesive layer may be made of pressure-sensitive adhesive. The insulating tape can be obtained by straight-line cutting of a long piece of insulating paper at regular intervals, or by multiple cuts from multiple directions on a larger area of ​​insulating paper.

[0161] In this embodiment, wrapping and pasting the electrode assembly with insulating tape can achieve a more reliable assembly effect, and also helps to save processes and improve efficiency.

[0162] The various embodiments of the battery cell 41 described above can be applied to various battery packs, battery modules, or electrical devices that use the battery cell 41. Therefore, in one aspect of this disclosure, a battery device 40 is provided, including the battery cell 41 of any of the foregoing embodiments. The battery device employing the battery cell 41 embodiments described above can improve reliability.

[0163] In one aspect of this disclosure, an electrical device is provided, including the battery device 40 of any of the foregoing embodiments. The electrical device employing the battery device embodiments described above can improve reliability.

[0164] In some specific embodiments, such as Figure 7 , Figure 4 and Figure 8 As shown, the battery cell includes a housing 11, an electrode assembly 20, and an insulating member 30. The housing 11 has a receiving cavity. The electrode assembly 20 is disposed within the receiving cavity and includes a main body 21 and a tab 22 extending from at least one end of the main body 21 in a first direction dr1. The insulating member 30 includes insulating tape and is bonded to the electrode assembly 20 to insulate the inner wall of the receiving cavity and the tab 22.

[0165] The insulating component 30 includes a first insulating segment 31 and a second insulating segment 32 that are connected to each other, and the first insulating segment 31 and the second insulating segment 32 are an integral structure.

[0166] The first insulating section 31 covers the first end face 221 of the tab 22 in the first direction dr1, and also covers the surfaces of the tab 22 on the opposite sides in the second direction dr2. The first insulating section 31 also covers the ends of the main body 21 adjacent to the tab 22 on both sides in the second direction dr2.

[0167] The second insulating segment 32 and the first insulating segment 31 are joined on the third direction dr3, covering the second end face 222 of the tab portion 22 on the side adjacent to the inner wall of the receiving cavity on the third direction dr3, and is bonded to the first insulating segment 31. The second direction dr2 is perpendicular to the first direction dr1, and the third direction dr3 is perpendicular to both the second direction dr2 and the first direction dr1.

[0168] The first insulating segment 31 extends from one end of the tab portion 22 along the third direction dr3 to the other end. The length of the first insulating segment 31 along the third direction dr3 in the state where the insulating member 30 is unfolded is defined as the first length L1. The length of the main body portion 21 along the third direction dr3 is defined as the second length L2. The length of the second insulating segment 32 along the third direction dr3 in the state where the insulating member 30 is unfolded is defined as the third length L3. The thickness of the main body portion 21 along the second direction dr2 is defined as the first thickness T1. The first length L1 and the second length L2 satisfy L1=L2, and the third length L3 and the first thickness T1 satisfy L3 / T1≥1.5.

[0169] The second insulating segment 32 and the first insulating segment 31 are joined on the third direction dr3 at one side of the tab 22 in the second direction dr2. After the second insulating segment 32 passes around the second end face 222, it is bonded to the surface of the first insulating segment 31 on the other side of the tab 22 in the second direction dr2.

[0170] In some specific embodiments, such as Figure 9 , ​ and ​ As shown, the battery cell includes a housing 11, an electrode assembly 20, and an insulating member 30. The housing 11 has a receiving cavity. The electrode assembly 20 is disposed within the receiving cavity and includes a main body 21 and a tab 22 extending from at least one end of the main body 21 in a first direction dr1. The insulating member 30 includes insulating tape and is bonded to the electrode assembly 20 to insulate the inner wall of the receiving cavity and the tab 22.

[0171] The insulating component 30 includes a first insulating segment 31 and a second insulating segment 32 that are connected to each other, and the first insulating segment 31 and the second insulating segment 32 are an integral structure.

[0172] The first insulating section 31 covers the first end face 221 of the tab 22 in the first direction dr1, and also covers the surfaces of the tab 22 on the opposite sides in the second direction dr2. The first insulating section 31 also covers the ends of the main body 21 adjacent to the tab 22 on both sides in the second direction dr2.

[0173] The second insulating segment 32 and the first insulating segment 31 are joined on the third direction dr3, covering the second end face 222 of the tab portion 22 on the side adjacent to the inner wall of the receiving cavity on the third direction dr3, and is bonded to the first insulating segment 31. The second direction dr2 is perpendicular to the first direction dr1, and the third direction dr3 is perpendicular to both the second direction dr2 and the first direction dr1.

[0174] The first insulating segment 31 extends from one end of the tab portion 22 along the third direction dr3 to the other end. The length of the first insulating segment 31 along the third direction dr3 in the unfolded state of the insulating member 30 is defined as the first length L1. The length of the main body portion 21 along the third direction dr3 is defined as the second length L2. The thickness of the main body portion 21 along the second direction dr2 is defined as the first thickness T1. The first length L1 and the second length L2 satisfy L1>L2. The first length L1, the second length L2 and the first thickness T1 satisfy: L1≥L2+0.5*T1.

[0175] The first insulating segment 31 has an overhang 312 on the third-direction dr3 relative to the main body 21. The overhang 312 is bonded to at least a portion of the second end face 222. The second insulating segment 32 is mated with the first insulating segment 31 on the third-direction dr3. At least a portion of the second insulating segment 32 covers the second end face 222 by bonding with the overhang 312.

[0176] The extended portion 312 includes a first extended segment 3121, a second extended segment 3122, and a third extended segment 3123. The first extended segment 3121 extends beyond the first end face 221 in the third direction dr3. The second extended segment 3122 extends beyond the surface of the tab 22 on one side in the second direction dr2 in the third direction dr3. The third extended segment 3123 extends beyond the surface of the tab 22 on the other side in the second direction dr2 in the third direction dr3.

[0177] The second insulating segment 32 and the first insulating segment 31 are located at the second end face 222 on the third direction dr3. After the second insulating segment 32 passes around the second end face 222, it is bonded to the surface of the first insulating segment 31 on the other side of the tab 22 in the second direction dr2.

[0178] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0179] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The housing (11) has a receiving cavity; An electrode assembly (20) is disposed within the receiving cavity, the electrode assembly (20) comprising a main body portion (21) and an electrode tab portion (22) extending from at least one end of the main body portion (21) in a first direction (dr1); and An insulating element (30) is bonded to the electrode assembly (20) to insulate and isolate the inner wall of the receiving cavity from the tab (22). The insulating member (30) includes a first insulating segment (31) and a second insulating segment (32) connected to each other. The first insulating segment (31) covers at least a portion of the first end face (221) of the tab (22) in the first direction (dr1) and also covers at least a portion of the surfaces of the tab (22) on opposite sides in the second direction (dr2). The second insulating segment (32) covers the second end face (222) of the tab (22) in the third direction (dr3) adjacent to the inner wall of the receiving cavity and is bonded to the first insulating segment (31). The second direction (dr2) intersects the first direction (dr1), and the third direction (dr3) intersects both the second direction (dr2) and the first direction (dr1).

2. The battery cell according to claim 1, characterized in that, The second direction (dr2) is perpendicular to the first direction (dr1), and the third direction (dr3) is perpendicular to both the second direction (dr2) and the first direction (dr1).

3. The battery cell according to claim 1 or 2, characterized in that, The first insulating segment (31) extends from one end of the tab (22) to the other end along the third direction (dr3). The length of the first insulating segment (31) along the third direction (dr3) in the state where the insulating member (30) is unfolded is defined as a first length L1. The length of the main body (21) along the third direction (dr3) is defined as a second length L2. The first length L1 and the second length L2 satisfy: L1=L2.

4. The battery cell according to claim 3, characterized in that, The first insulating segment (31) also covers the end of the main body (21) adjacent to the tab (22) on both sides in the second direction (dr2). The second insulating segment (32) and the first insulating segment (31) are connected in the third direction (dr3). The length of the second insulating segment (32) along the third direction (dr3) in the state where the insulating member (30) is unfolded is defined as the third length L3. The thickness of the main body (21) along the second direction (dr2) is defined as the first thickness T1. The third length L3 and the first thickness T1 satisfy: L3>T1.

5. The battery cell according to claim 4, characterized in that, The third length L3 and the first thickness T1 satisfy: L3 / T1≥1.

5.

6. The battery cell according to any one of claims 4-5, characterized in that, The second insulating segment (32) and the first insulating segment (31) are joined at the third direction (dr3) on one side of the tab (22) in the second direction (dr2). After the second insulating segment (32) passes around the second end face (222), it is bonded to the surface of the first insulating segment (31) on the other side of the tab (22) in the second direction (dr2).

7. The battery cell according to claim 1 or 2, characterized in that, The first insulating segment (31) extends from one end of the tab (22) to the other end along the third direction (dr3). The length of the first insulating segment (31) along the third direction (dr3) in the state where the insulating member (30) is unfolded is defined as a first length L1. The length of the main body (21) along the third direction (dr3) is defined as a second length L2. The first length L1 and the second length L2 satisfy: L1>L2.

8. The battery cell according to claim 7, characterized in that, The first insulating segment (31) also covers the end of the main body (21) adjacent to the tab (22) on both sides in the second direction (dr2). The thickness of the main body (21) along the second direction (dr2) is defined as the first thickness T1. The first length L1, the second length L2 and the first thickness T1 satisfy: L1≥L2+0.5*T1.

9. The battery cell according to claim 7 or 8, characterized in that, The first insulating segment (31) has an overhang (312) relative to the main body (21) in the third direction (dr3), the overhang (312) being bonded to at least a portion of the second end face (222), the second insulating segment (32) being abutted to the first insulating segment (31) in the third direction (dr3), and at least a portion of the second insulating segment (32) covering the second end face (222) by bonding with the overhang (312).

10. The battery cell according to claim 9, characterized in that, The extended portion (312) includes at least one of a first extended segment (3121), a second extended segment (3122), and a third extended segment (3123), wherein the first extended segment (3121) extends beyond the first end face (221) in the third direction (dr3), the second extended segment (3122) extends beyond the surface of the tab (22) on one side in the second direction (dr2) in the third direction (dr3), and the third extended segment (3123) extends beyond the surface of the tab (22) on the other side in the second direction (dr2) in the third direction (dr3).

11. The battery cell according to any one of claims 7-10, characterized in that, The second insulating segment (32) and the first insulating segment (31) are located at the second end face (222) on the third direction (dr3). After the second insulating segment (32) passes around the second end face (222), it is bonded to the surface of the first insulating segment (31) on the other side of the tab (22) in the second direction (dr2).

12. The battery cell according to any one of claims 1-11, characterized in that, The first insulating segment (31) and the second insulating segment (32) are an integral structure.

13. The battery cell according to any one of claims 1-12, characterized in that, The insulating component (30) includes insulating tape.

14. A battery device (40), characterized in that, include: The battery cell according to any one of claims 1-13.

15. An electrical appliance, characterized in that, include: The battery device (40) according to claim 14.

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