Battery monomer, battery and electric device

Abstract

The embodiment of the invention provides a battery monomer, a battery and an electric device. The battery cell comprises: an electrode lead-out part for leading out the electric energy of the battery cell; the electrode assembly comprises a main body and a tab, the tab comprises a transition part and a connecting part, the transition part is connected between the connecting part and the main body, and the connecting part is connected with the electrode leading-out part to form a connecting area; the insulating component comprises a first insulator fixed on the main body and a third insulator fixed on the connecting part, and the insulating component further comprises a second insulator connected between the first insulator and the third insulator; and the part, from the first connecting part to the second connecting part, of the tab is not fixed on the insulating component. According to the battery monomer, the battery and the electric device provided by the embodiment of the invention, the problem that the tab is torn due to the bonding force between the insulating component and the tab when the tab is unfolded, bent or moved can be solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] At present, secondary batteries mainly include a shell and an electrode assembly disposed in the shell. The shell is provided with an electrode terminal, and the electrode assembly is provided with a tab, which is electrically connected to the electrode terminal. In the related art, an insulating member is covered on the tab to protect the tab. However, the tab may tear after being covered with the insulating member. Therefore, how to reduce the problem of tab tearing has become a new issue. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a battery cell, a battery and an electrical device, which are helpful in solving the problem of tab tearing caused by the bonding force between the insulating component and the tab when the tab is unfolded, bent or moved.

[0004] In a first aspect, a battery cell is provided, comprising: an electrode lead-out portion for leading out electric energy of the battery cell; an electrode assembly, comprising a main body and a pole lug, the pole lug comprising a transition portion and a connecting portion, the transition portion being connected between the connecting portion and the main body, the connecting portion being connected to the electrode lead-out portion and forming a connecting area; an insulating member, the insulating member comprising a first insulator fixed to the main body and a third insulator fixed to the connecting portion, the insulating member further comprising a second insulator connected between the first insulator and the third insulator; wherein a portion of the pole lug from the first connection point to the second connection point is not fixed to the insulating member, the first connection point is the connection point between the main body and the pole lug, and the second connection point is the edge of the connecting area closest to the transition portion.

[0005] In this embodiment, by not fixing the portion from the first connection to the second connection of the pole ear to the insulating component, the stress concentration problem generated from the first connection to the second connection during the expansion, bending or movement of the pole ear can be alleviated, which is beneficial to reducing the problem of pole ear tearing during the expansion, bending or movement of the pole ear.

[0006] In a possible implementation, a portion of the electrode tab from the first connection point to the second connection point is not fixed to the second insulator.

[0007] In this embodiment, by not fixing the portion of the pole ear from the first connection to the second connection to the second insulator, the pole ear can release stress during the unfolding, bending or movement of the pole ear, reducing the tension applied to the pole ear by the insulating component and reducing the risk of the pole ear breaking.

[0008] In one possible implementation, the first insulator includes a first insulating layer and a first adhesive coating, the third insulator includes a third insulating layer and a third adhesive coating, the first insulating layer is bonded to the main body through the first adhesive coating, and the third insulating layer is bonded to the connecting part through the third adhesive coating; the second insulator includes a second insulating layer, and the surface of the second insulating layer facing the pole ear is exposed.

[0009] In this embodiment, by setting the surface of the second insulating layer facing the tab to be exposed, the portion of the tab from the first connection point to the second connection point can be not fixed to the insulating member, thereby reducing the pulling force applied by the insulating member to the tab during the tab is unfolded, bent or moved, thereby reducing the risk of the tab breaking. In addition, the material used for the adhesive coating can be reduced, thereby reducing costs.

[0010] In one possible implementation, the first insulator includes a first insulating layer and a first adhesive coating, the second insulator includes a second insulating layer and a second adhesive coating, and the third insulator includes a third insulating layer and a third adhesive coating; the second insulator also includes a fourth insulating layer, the fourth insulating layer is bonded to the second insulating layer through the second adhesive coating, and the surface of the fourth insulating layer facing the tab is exposed.

[0011] In this embodiment, by bonding the fourth insulating layer to the second adhesive coating and exposing its surface facing the tab, the portion of the tab from the first connection point to the second connection point can be not fixed to the insulating member, thereby reducing the pulling force applied by the insulating member to the tab during the tab is unfolded, bent or moved, thereby reducing the risk of the tab breaking. In addition, the fourth insulating layer only needs to be bonded to the position corresponding to the tab from the first connection point to the second connection point, thereby reducing the manufacturing complexity of the insulating member.

[0012] In a possible implementation manner, along the expansion direction of the insulating component, the first insulator and the third insulator have the same size.

[0013] In this embodiment, the sizes of the first insulator and the third insulator are set to be the same in the development direction of the insulating member, which can simplify the preparation of the insulating member.

[0014] In a possible implementation manner, along the expansion direction of the insulating member, the first insulator and the third insulator have different sizes.

[0015] In this embodiment, by providing the insulating member with an asymmetric structure, it is advantageous to ensure that the third insulator does not extend to the connection region of the adjacent electrode assembly while ensuring the bonding force between the main body and the first insulator.

[0016] In a possible implementation manner, along the expansion direction of the insulating component, the size of the first insulator is larger than the size of the third insulator.

[0017] In this embodiment, an asymmetric insulating component is used, and the size of the first insulator is set to be larger than that of the third insulator, so as to ensure the size of each insulator in the insulating component, which can ensure that the bonding force between the main body and the first insulator is large enough and ensure that the third insulator does not extend to the connection area of ​​the adjacent electrode assembly.

[0018] In a possible implementation manner, the first insulator and the third insulator have different colors.

[0019] In this embodiment, by setting the colors of the first insulator and the third insulator to be different, a charge coupled device (CCD) camera can identify the position of the insulating component by color. When the positions of the first insulator and the third insulator are reversed, the CCD camera will alarm after detecting it, thereby achieving a fool-proof effect.

[0020] In a possible implementation, the first adhesive coating layer and the third adhesive coating layer have different colors.

[0021] In this embodiment, by applying adhesive coatings of different colors so that the first insulator and the third insulator have different colors, it can be ensured that the first insulator and the third insulator will not be pasted upside down, which can play a fool-proof role.

[0022] In a possible implementation manner, the first adhesive coating is spaced apart from the first connection point, and / or the third adhesive coating is spaced apart from the second connection point.

[0023] In this embodiment, by spacing the first adhesive coating from the first connection, and / or spacing the third adhesive coating from the second connection, the first connection can be protected from being pulled by the first adhesive coating and the second connection can be protected from being pulled by the third adhesive coating during the unfolding, bending or movement of the tab, thereby reducing the risk of the tab breaking.

[0024] In a possible implementation manner, the first insulator, the second insulator and the third insulator are integrally formed.

[0025] In this embodiment, the first insulator, the second insulator and the third insulator are integrally arranged, so that the strength of the insulating component can be improved and the risk of falling off can be reduced.

[0026] In a possible implementation manner, at least one of the first insulator, the second insulator, and the third insulator is formed independently.

[0027] In this embodiment, at least one of the first insulator, the second insulator and the third insulator is formed independently, and when a part of the insulating component fails, only the part of the insulator needs to be replaced without replacing the entire insulating component, thereby reducing costs.

[0028] In a possible implementation, the battery cell includes a first electrode assembly and a second electrode assembly that are adjacent to each other, and an insulating component corresponding to the first electrode assembly and an insulating component corresponding to the second electrode assembly are independently integrally formed.

[0029] In this embodiment, the insulating component corresponding to the first electrode assembly and the insulating component corresponding to the second electrode assembly are independently integrally formed, which can enhance the overall strength of the insulating component corresponding to the first electrode assembly and the overall strength of the insulating component corresponding to the second electrode assembly, and when the insulating component corresponding to a certain electrode assembly fails, only the corresponding insulating component needs to be replaced, thereby reducing costs.

[0030] In a possible implementation, the battery cell includes a first electrode assembly and a second electrode assembly that are adjacent to each other, and a third insulator corresponding to the first electrode assembly and a third insulator corresponding to the second electrode assembly are integrally formed.

[0031] In this embodiment, the third insulator included in the insulating component corresponding to the first electrode assembly and the third insulator included in the insulating component corresponding to the second electrode assembly are integrally formed, so that the insulating component corresponding to the first electrode assembly and the insulating component corresponding to the second electrode assembly can be combined together as much as possible to improve production capacity.

[0032] In a possible implementation, the first insulator and the second insulator corresponding to the first electrode assembly are integrally formed, and the first insulator and the second insulator corresponding to the second electrode assembly are integrally formed.

[0033] In this embodiment, the first insulator and the second insulator included in the insulating component corresponding to the first electrode assembly are integrally formed, the first insulator and the second insulator included in the insulating component corresponding to the second electrode assembly are integrally formed, and the third insulator included in the insulating component corresponding to the first electrode assembly and the third insulator included in the insulating component corresponding to the second electrode assembly are integrally formed. In the event that a part of the insulation fails, only the part of the insulator needs to be replaced, thereby reducing costs.

[0034] In one possible implementation, the first insulator corresponding to the first electrode assembly is formed independently, the first insulator corresponding to the second electrode assembly is formed independently, and the second insulator and the third insulator corresponding to the first electrode assembly are integrally formed with the second insulator and the third insulator corresponding to the second electrode assembly.

[0035] In this embodiment, the first insulator included in the insulating component corresponding to the first electrode assembly is molded independently, the second insulator and the third insulator included in the insulating component corresponding to the first electrode assembly and the second insulator and the third insulator included in the insulating component corresponding to the second electrode assembly are molded integrally, and the first insulating component included in the insulating component corresponding to the second electrode assembly is molded independently. In the event that a part of the insulation fails, only the part of the insulator needs to be replaced, thereby reducing costs.

[0036] In a possible implementation, the insulating component corresponding to the first electrode assembly and the insulating component corresponding to the second electrode assembly are integrally formed.

[0037] In this embodiment, the insulating component corresponding to the first electrode assembly and the insulating component corresponding to the second electrode assembly are integrally formed, and only one insulating component needs to be covered between two adjacent electrode assemblies, which reduces the number of splicing times and eliminates the need for fool-proofing, thereby improving production capacity.

[0038] In a possible implementation, the electrode lead portion and the connection portion are welded, and the connection area is a weld print area.

[0039] In this embodiment, the connection strength between the electrode lead-out portion and the electrode tab can be improved by welding the electrode lead-out portion and the connection portion.

[0040] In one possible implementation, the electrode lead-out portion includes an electrode terminal, which is welded to the connecting portion; or, the electrode lead-out portion includes an electrode terminal and a connecting member, the connecting portion is electrically connected to the electrode terminal via the connecting member, and the connecting portion is welded to the connecting member.

[0041] In this embodiment, the electrode terminal and the connecting portion are directly welded without connecting through a connecting member, which can reduce costs and improve the space utilization of the battery cell. The connecting portion and the electrode terminal are connected through a connecting member, which facilitates the connection of the tab and the electrode terminal.

[0042] In a possible implementation, the electrode lead portion is disposed on the first wall of the battery cell, the transition portion is connected between the first end surface of the body and the connection portion, and the first end surface is disposed opposite to the first wall.

[0043] In this embodiment, by bending the transition portion relative to the first end surface of the main body, the space occupied by the tab can be greatly saved.

[0044] In a second aspect, a battery is provided, comprising the battery cell provided in the first aspect.

[0045] In a third aspect, an electrical device is provided, comprising the battery according to the second aspect, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0047] Figure 1 It is a structural schematic diagram of a vehicle disclosed in one embodiment of the present application.

[0048] Figure 2 It is a schematic diagram of the structure of a battery disclosed in one embodiment of the present application.

[0049] Figure 3 It is a schematic exploded view of a battery cell disclosed in an embodiment of the present application.

[0050] Figure 4 Shows Figure 3 A cross-sectional view of a portion of a battery cell in which the tab is in a non-bent state.

[0051] Figure 5 A schematic exploded view of a battery cell according to another embodiment of the present application is shown.

[0052] Figure 6 A schematic cross-sectional view of an insulating component in an expanded state according to an embodiment of the present application is shown.

[0053] Figure 7 A schematic cross-sectional view of another insulating component in an expanded state according to an embodiment of the present application is shown.

[0054] Figure 8 A top view of an insulating component in an expanded state according to an embodiment of the present application is shown.

[0055] Fig. 9 A top view of another insulating component in an expanded state according to an embodiment of the present application is shown.

[0056] Fig.10 Shows Figure 4 A cross-sectional view of a battery cell including two adjacent electrode assemblies.

[0057] Fig.11 Shows Figure 4 Another cross-sectional view of a battery cell including two adjacent electrode assemblies.

[0058] Fig.12 Shows Fig.11 A top view of an insulating component in an unfolded state.

[0059] Fig.13 Shows Fig.11 A top view of another insulating component in the unfolded state.

[0060] Fig.14 Shows Fig.11 A top view of another insulating component in the expanded state.

[0061] Description of reference numerals:

[0062] 1-vehicle; 80-motor; 60-controller; 100-battery; 111-first housing; 112-second housing; 20-battery cell; 211-housing; 212-cover; 22-electrode assembly; 23-connecting member; 24-insulating member; 214-electrode terminal; 214a-positive electrode terminal; 214b-negative electrode terminal; 221-ear; 221a-first ear; 221b-second ear; 222-body; 2221-first end surface ; 2222-first side; 2211-transition part; 2212-connection part; 201-electrode lead-out part; 202-connection area; 203-first connection; 204-second connection; 241-first insulator; 242-second insulator; 243-third insulator; 2411-first insulating layer; 2412-first adhesive coating; 2421-second insulating layer; 2422-second adhesive coating; 2431-third insulating layer; 2432-third adhesive coating Layer; 2423-fourth insulating layer; 22a-first electrode assembly; 221a-ear of the first electrode assembly; 222a-main body of the first electrode assembly; 2211a-transition portion of the first electrode assembly; 2212a-connecting portion of the first electrode assembly; 24a-insulating component corresponding to the first electrode assembly; 241a-first insulator corresponding to the first electrode assembly; 242a-second insulator corresponding to the first electrode assembly; 243a-third insulator corresponding to the first electrode assembly; 22b-second electrode assembly; 221b-ear of the second electrode assembly; 222b-main body of the second electrode assembly; 2211b-transition portion of the second electrode assembly; 2212b-connecting portion of the second electrode assembly; 24b-insulating component corresponding to the second electrode assembly; 241b-first insulator corresponding to the second electrode assembly; 242b-second insulator corresponding to the second electrode assembly; 243b-third insulator corresponding to the second electrode assembly; Y-expansion direction of the insulating component. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0065] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0066] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0067] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0068] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0069] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0070] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0071] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0072] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0073] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0074] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the positive electrode active material may include at least one of the following materials: a lithium-containing phosphate, a lithium transition metal oxide, and their respective modified compounds.

[0076] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0077] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0078] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0079] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.

[0080] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0081] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0082] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0083] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0084] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0085] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0086] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0087] In some embodiments, the electrode assembly is a laminate structure.

[0088] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0089] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0090] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0091] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0092] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0093] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0094] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0095] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film. The housing includes a shell and a cover plate.

[0096] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0097] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0098] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0099] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0100] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0101] Currently, a battery cell mainly includes a shell and an electrode assembly arranged in the shell. The shell is provided with electrode terminals, and the electrode assembly is provided with tabs. The tabs are directly or indirectly electrically connected to the electrode terminals to realize the extraction of electrical energy inside the battery cell to the outside of the battery cell.

[0102] In order to protect the tabs, the tabs are covered with insulating components in the related art. If the insulating components are bonded to the tabs on their entire surface, stress points exist between the tabs and the main body of the electrode assembly and between the tabs and the electrode terminals or connecting components. When the tabs are unfolded, bent or moved, the tabs bonded to the insulating components may be torn.

[0103] In view of this, an embodiment of the present application provides a battery cell, which helps to solve the problem of the pole ear tearing caused by the bonding force between the insulating component and the pole ear when the pole ear is unfolded, bent or moved by setting the portion of the pole ear from the first connection to the second connection to be not fixed to the insulating component.

[0104] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0105] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0106] For example, Figure 1As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 80, a controller 60 and a battery 100 may be arranged inside the vehicle 1. The controller 60 is used to control the battery 100 to supply power to the motor 80. For example, a battery 100 may be arranged at the bottom, front or rear of the vehicle 1. The battery 100 may be used to supply power to the vehicle 1. For example, the battery 100 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0107] For example, Figure 2 , which is a schematic diagram of the structure of a battery 100 according to an embodiment of the present application. The battery 100 may include a plurality of battery cells 20. In addition to the battery cells 20, the battery 100 may also include a box body, the interior of the box body is a hollow structure, and the plurality of battery cells 20 may be accommodated in the box body. Figure 2 As shown, the box body may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are buckled together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the combination of multiple battery cells 20, and at least one of the first box body part 111 and the second box body part 112 has an opening. For example, Figure 2 As shown, only one of the first box body 111 and the second box body 112 is a hollow cuboid with an opening, and the other is in a plate shape to cover the opening. Here, taking the second box body 112 as a hollow cuboid with only one face as an opening face, and the first box body 111 as a plate-shaped example, the first box body 111 covers the opening of the second box body 112 to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. After the multiple battery cells 20 are connected in parallel, in series or in mixed series, they are placed in the box body formed by the first box body 111 and the second box body 112 being buckled together.

[0108] For example, unlike Figure 2 As shown, the first box body 111 and the second box body 112 can both be hollow cuboids and each have only one open face, the opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box with a closed chamber. A plurality of battery cells 20 are connected in parallel, in series or in a mixed combination and are placed in the box formed by the first box body 111 and the second box body 112 buckled together.

[0109] Figure 3 A schematic exploded view of a battery cell 20 according to an embodiment of the present application is shown. Figure 4 A schematic exploded view of a battery cell 20 according to another embodiment of the present application is shown.

[0110] like Figure 3 and Figure 4 As shown, the battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212, wherein the wall of the shell 211 and the cover plate 212 are both referred to as the wall of the battery cell 20. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined. For example, the shell 211 may be a hollow cuboid or a cube or a cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a cube, one of the planes of the shell 211 is an open face, that is, the plane does not have a wall body so that the inside and outside of the shell 211 are connected. When the shell 211 may be a hollow cylinder, the end face of the shell 211 is an open face, that is, the end face does not have a wall body so that the inside and outside of the shell 211 are connected. The cover plate 212 covers the opening and is connected to the shell 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0111] The battery cell 20 further includes two electrode terminals 214. The cover plate 212 is generally in the shape of a flat plate, and the two electrode terminals 214 are fixed on the flat surface of the cover plate 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b.

[0112] like Figure 3 and Figure 4 As shown, each electrode assembly 22 has a tab 221, including a first tab 221a and a second tab 221b. The first tab 221a and the second tab 221b have opposite polarities. When the first tab 221a is a positive tab, the second tab 221b is a negative tab. For example, Figure 3 As shown, the first tab 221a of one or more electrode assemblies 22 is connected to the positive electrode terminal 214a, and the second tab 221b of one or more electrode assemblies 22 is connected to the negative electrode terminal 214b. Figure 4 As shown, the first tab 221a of one or more electrode assemblies 22 is connected to the positive electrode terminal 214a through a connecting member 23, and the second tab 221b of one or more electrode assemblies 22 is connected to the negative electrode terminal 214b through another connecting member 23.

[0113] As an example, a pressure relief mechanism 213 may be further provided on one wall of the battery cell 20. The pressure relief mechanism 213 is used to be actuated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.

[0114] Optionally, the pressure relief mechanism 213 may be disposed on the cover plate 212 , or on any wall of the housing 211 .

[0115] like Figure 3 and Figure 4 As shown, the battery cell 20 further includes an insulating member 24 , which is disposed on a side of the pole lug 221 away from the cover plate 212 and is fixedly connected to the pole lug 221 to play an insulating role.

[0116] Figure 5 FIG. 2 shows a cross-sectional view of a battery cell 20 according to an embodiment of the present application. In one embodiment, the battery cell 20 may be formed by being installed in a housing with the tab bent. Figure 3 and Figure 4 In another embodiment, the battery cell 20 can also be formed by directly inserting the battery cell 20 into the housing without bending the tabs.

[0117] like Figure 5 As shown, the battery cell 20 includes: an electrode lead-out portion 201, used to lead out the electrical energy of the battery cell 20; an electrode assembly 22, including a main body 222 and a pole ear 221, the pole ear 221 includes a transition portion 2211 and a connecting portion 2212, the transition portion 2211 is connected between the connecting portion 2212 and the main body 222, the connecting portion 2212 is connected to the electrode lead-out portion 201 and forms a connecting area 202; an insulating member 24, the insulating member 24 includes a first insulator 241 fixed to the main body 222 and a third insulator 243 fixed to the connecting portion 2212, and the insulating member 24 also includes a second insulator 242 connected between the first insulator 241 and the third insulator 243. The portion of the tab 221 from the first connection 203 to the second connection 204 is not fixed to the insulating component 24 . The first connection 203 is the connection between the main body 222 and the tab 221 . The second connection 204 is the edge of the connection region 202 closest to the transition portion 2211 .

[0118] It should be understood that the electrode lead-out portion 201 is used to lead the electric energy of the battery cell 20 out of the battery cell 20 and to be connected in series or in parallel with other battery cells. Figure 3 As shown, it includes an electrode terminal 214, wherein the electrode tab 221 is directly electrically connected to the electrode terminal 214; or, the electrode lead portion 21 can also be as Figure 4As shown, it includes an electrode terminal 214 and a connecting member 23 , wherein the electrode tab 221 is electrically connected to the electrode terminal 214 through the connecting member 23 .

[0119] In one example, the tab 221 may be Figure 3 and Figure 4 As shown, the electrode lead portion 201 is bent relative to the main body 222, that is, the electrode lead portion 201 is arranged opposite to the electrode assembly 22. In another example, the electrode ear 221 can be as Figure 5 As shown, there is no bending, that is, the electrode lead-out portion 201 is arranged at an angle with the electrode assembly 22. For example, the electrode lead-out portion 201 is arranged perpendicular to the electrode assembly 22.

[0120] In some embodiments, the tab 221 may be formed by extending from the first end surface 2221 of the body 222 .

[0121] For example, the tab 221 is formed by extending from a portion of the first end surface 2221 of the main body 222. Figure 5 In this example, along the extension direction of the insulating member 24, the first insulator 241 may include: Figure 5 The a section and the b section shown in the figure are as follows: the a section is the size of the first side surface 2222 of the first insulator 241 fixed to the main body 222, and the b section is the size of the first end surface 2221 of the first insulator 241 fixed to the main body 222. The second insulator 242 may include Figure 5 The c section shown in the figure is the exposed dimension of the surface of the insulating member 24 facing the pole ear 221. The third insulator 243 may include Figure 5 The section f shown is the dimension of the insulating component 24 that is fixedly connected to the connecting portion 2212 .

[0122] For another example, the tab 221 is formed by extending from the entire first end surface 2221 of the main body 222. In this example, along the extension direction of the insulating member 24, the first insulator 241 may only include Figure 5 The third insulator 243 may also include Figure 5 As shown in the f segment, the second insulator 242 is connected between the first insulator 241 and the third insulator 243, and almost covers the entire first end surface 2221.

[0123] In some examples, the exposed portion of the surface of the insulating member 24 facing the tab 221 may only cover the portion of the tab 221 from the first connection 203 to the second connection 204. In this example, Figure 5 The b segment in the figure can extend downward to the first connection 203. The f segment can extend leftward to the second connection 204, that is, the f segment is approximately equal to the sum of the d segment and the e segment, the d segment is the size of the connection area 202, and the e segment is the size of the third insulator 243 beyond the connection area 202.

[0124] In some other examples, the first insulator 241 is spaced apart from the first connection 203, and / or the third insulator 243 is spaced apart from the second connection 204. For example, Figure 5 The c section shown is the distance between the first connection 203 and the second connection 204, plus 1 mm to 10 mm. For example, the length of the c section beyond the first connection 203 is 1 mm, and the length of the c section beyond the second connection 204 is 1 mm.

[0125] Generally, stress concentration will occur at the connection between the pole tab 221 and the main body 222 and between the pole tab 221 and the electrode lead-out portion 201, that is, the first connection 203 is the stress point where the pole tab 221 and the main body 222 are connected, the second connection 204 is the stress point where the pole tab 221 and the electrode lead-out portion 201 are connected, and the transition portion 2211 may include the portion between the two stress points. The connection portion 2212 refers to the portion of the pole tab 221 used to connect to the electrode lead-out portion 201, and can also be generally understood as the gathered portion of the pole tab 221. The connection area 202 is the connection portion between the connection portion 2212 and the electrode lead-out portion 201. For example, if the connection portion 2212 is welded to the electrode lead-out portion 201, the connection area 202 is the weld mark area between the two.

[0126] As described above, the electrode assembly is formed by overlapping a plurality of positive plates and a plurality of negative plates, and each plate is formed with a pole ear, that is, the electrode assembly 22 in the embodiment of the present application may include one or more pole ears 221. In the case where the electrode assembly 22 has a plurality of pole ears 221, there are a plurality of connections between the plurality of pole ears 221 and the main body 222. When the pole ear 221 is in an unfolded state, the first connection 203 can be understood as the connection closest to the first insulator 241 among the plurality of connections, or the first connection 203 can be understood as the connection closest to the first side surface 2222 among the plurality of connections. When the pole ear 221 is in a bent state, the first connection 203 can be understood as the connection between the main body 222 and the innermost pole ear 221 of the bend. The second connection 204 is the edge of the connection area 202 closest to the transition portion 2211, and may include: when the pole ear 221 is in the unfolded state, the second connection 204 may be the position of the connection area 202 closest to the transition portion 2211; and when the pole ear is in the bent state, the second connection 204 may be the part of the connection area 202 closest to the bending zone.

[0127] In the embodiment of the present application, by arranging the second insulator 242 between the first insulator 241 and the third insulator 243 to connect the first insulator 241 and the third insulator 243 together, the connection strength of the first insulator 241 and the third insulator 243 on the electrode assembly 22 can be improved, and the risk of falling off can be reduced. In addition, by not fixing the portion from the first connection 203 to the second connection 204 of the pole ear 221 to the insulating member 24, the stress concentration problem generated from the first connection 203 to the second connection 204 can be alleviated during the unfolding, bending or movement of the pole ear 221, so that the first connection 203 is not pulled by the insulating member 24 and the second connection 225 is not pulled by the insulating member 24, which is conducive to reducing the problem of the pole ear tearing when the pole ear 221 is unfolded or bent.

[0128] In some embodiments, a portion of the tab 221 from the first connection 203 to the second connection 204 is not fixed to the second insulator 242 .

[0129] like Figure 5 As shown, the second insulator 242 can cover the portion of the pole lug 221 from the first connection 203 to the second connection 204. Therefore, the portion of the pole lug 221 from the first connection 203 to the second connection 204 is not fixed to the insulating member 24. It can also be understood that the portion of the pole lug 221 from the first connection 203 to the second connection 204 is not fixed to the second insulator 242.

[0130] In this embodiment, by not fixing the portion of the pole lug 221 from the first connection 203 to the second connection 204 to the second insulator 242, the pole lug 221 can release stress when the pole lug 221 is unfolded, bent or moved, thereby reducing the tension applied to the pole lug 221 by the insulating component 24 and reducing the risk of the pole lug 221 breaking.

[0131] Figure 6 A schematic cross-sectional view of an insulating member 24 in an expanded state according to an embodiment of the present application is shown. Figure 7 A schematic cross-sectional view of another insulating member 24 according to an embodiment of the present application in an expanded state is shown.

[0132] like Figure 6 As shown, the first insulator 241 includes a first insulating layer 2411 and a first adhesive coating 2412, the third insulator 243 includes a third insulating layer 2431 and a third adhesive coating 2432, the first insulating layer 2411 is bonded to the main body 222 through the first adhesive coating 2412, the third insulating layer 2431 is bonded to the connecting portion 2212 through the third adhesive coating 2432, and the second insulator 242 includes a second insulating layer 2421, and the surface of the second insulating layer 2421 facing the pole ear 221 is exposed.

[0133] It should be understood that the surface of the second insulating layer 2421 facing the pole lug 221 is exposed, which can be understood as that the side of the second insulating layer 2421 facing the pole lug 221 is not provided with an adhesive coating.

[0134] In this embodiment, by setting the surface of the second insulating layer 2421 facing the pole lug 221 to be exposed, the portion of the pole lug 221 from the first connection 203 to the second connection 204 can be not fixed to the second insulator 242, thereby reducing the pulling force applied by the insulating member 24 to the pole lug 221 during the unfolding, bending or movement of the pole lug 221, thereby reducing the risk of breaking the pole lug 221. In addition, the material used for the adhesive coating can be reduced, thereby reducing costs.

[0135] like Figure 7 As shown, the first insulator 241 includes a first insulating layer 2411 and a first adhesive coating 2412, the second insulator 242 includes a second insulating layer 2421 and a second adhesive coating 2422, and the third insulator 243 includes a third insulating layer 2431 and a third adhesive coating 2422; the second insulator 242 also includes a fourth insulating layer 2423, which is bonded to the second insulating layer 2421 via the second adhesive coating 2422, and the surface of the fourth insulating layer 2423 facing the pole ear 221 is exposed.

[0136] It should be understood that the surface of the fourth insulating layer 2423 facing the pole lug 221 is exposed, which can be understood as that the side of the fourth insulating layer 2423 facing the pole lug 221 is not provided with an adhesive coating.

[0137] In this embodiment, by bonding the fourth insulating layer 2423 to the second adhesive coating 2422 and exposing its surface facing the tab 221, the portion of the tab 221 from the first connection 203 to the second connection 204 is not fixed to the second insulator 242, thereby reducing the pulling force applied by the insulating member 24 to the tab 221 during the unfolding, bending or movement of the tab 221, thereby reducing the risk of breaking the tab 221. In addition, the fourth insulating layer 2423 only needs to be bonded to the position corresponding to the tab 221 from the first connection 203 to the second connection 204, thereby reducing the manufacturing complexity of the insulating member 24.

[0138] The material of the insulating layer in the embodiment of the present application may include at least one of PP material, PE material, PET material, etc. The thickness of the insulating layer plus the adhesive coating may range from 0.001 mm to 0.5 mm. For example, the thickness of the first insulator 241 is Figure 7 The thickness of the second insulator 232 excluding the fourth insulating layer 2423 and the thickness of the third insulator 243 are both within the range of 0.001 mm to 0.5 mm.

[0139] Figure 8 A top view of an insulating component 24 in an expanded state according to an embodiment of the present application is shown. Fig. 9 A top view of another insulating member 24 in an expanded state according to an embodiment of the present application is shown.

[0140] In one embodiment, along the expansion direction Y of the insulating member 24 , the first insulator 241 and the third insulator 243 have the same size.

[0141] It can also be understood that the insulating member 24 is a symmetrical structure. Figure 8 As shown, the size of the first insulator 241 is L1, and the size of the third insulator 242 is also L1.

[0142] The expansion direction Y of the insulating member 24 can be understood as Figure 8 The arrangement directions of the first insulator 241 , the second insulator 242 , and the third insulator 243 in the expanded state of the insulating member 24 are shown.

[0143] As can be seen from the above description, in order to disperse the stress of the first connection 203, the first insulator 241 fixed to the main body 222 needs to have a certain size. Similarly, in order to disperse the stress of the second connection 204, the third insulator 243 fixed to the connection portion 2212 also needs to have a certain size. In some embodiments, the size of the first insulator 241 and the size of the third insulator 243 can be set according to the size of the insulator required for fixed connection with the main body 222 and the size of the insulator required for fixed connection with the connection portion 2212. For example, if the size of the insulator required for fixed connection with the connection portion 2212 is smaller, the first insulator 241 and the third insulator 243 can be set to the size of the insulator required for fixed connection with the connection portion 2212.

[0144] In this embodiment, the sizes of the first insulator 241 and the third insulator 243 are set to be the same along the development direction Y of the insulating member 24 , so that the preparation of the insulating member 24 can be simplified.

[0145] In the development direction Y of the insulating member 24 , the first insulator 241 and the third insulator 243 have different sizes.

[0146] It can also be understood that the insulating member 24 is an asymmetric structure. Fig. 9 As shown, the size of the first insulator 241 is L1, and the size of the third insulator 242 is L2.

[0147] In this embodiment, by configuring the insulating member 24 to have an asymmetric structure, it is advantageous to ensure the bonding force between the main body 222 and the insulating member 24 while ensuring that the insulating member 24 does not extend to the connection region of the adjacent electrode assembly.

[0148] In some embodiments, along the expansion direction Y of the insulating member 24 , a size of the first insulator 241 is greater than a size of the third insulator 243 .

[0149] For example, Figure 5 As shown, the size of the first insulator 241 is equal to a+b, and the size of the third insulator 242 is equal to c+d, wherein a+b is greater than d+e.

[0150] When the insulating member 24 is a symmetrical structure, the size of the first insulator 241 needs to be reduced so that the insulating member 24 does not extend to the connection area of ​​the adjacent electrode assembly, but this may cause the bonding force between the insulating member 24 and the main body 222 to be small, resulting in the risk of the insulating member 24 being folded and having a poor appearance. In this embodiment, an asymmetrical insulating member 24 is used, and the size of the first insulator 241 is set to be larger than the size of the third insulator 243, so as to ensure the size of each insulator, which can ensure that the bonding force between the main body 222 and the insulating member 24 is large enough and that the insulating member 24 does not extend to the connection area of ​​the adjacent electrode assembly.

[0151] In some embodiments, the first insulator 241 and the third insulator 243 have different colors. For example, the color of the first insulator 241 is yellow, and the color of the third insulator 243 is blue.

[0152] When the tab 221 is attached to the insulating member 24, the gluing mechanism has a CCD camera that detects whether the insulating member 24 is attached. The CCD camera identifies whether the insulating member 24 is attached by the color of the insulating member 24. When the same color asymmetric insulating member 24 is used, since the sizes of the first insulator 241 and the third insulator 243 are different, the CCD camera cannot identify whether the positions of the first insulator 241 and the third insulator 243 are attached incorrectly, so there is a problem of not being able to prevent mistakes. In this embodiment, by setting the colors of the first insulator 241 and the third insulator 243 to be different, the CCD camera can identify the position of the insulating member 24 by color. When the positions of the first insulator 241 and the third insulator 243 are attached in reverse, the CCD camera will alarm after checking, which has a fool-proof effect.

[0153] In other embodiments, the first adhesive coating 2412 and the third adhesive coating 2432 are different in color. For example, the first adhesive coating 2412 is yellow, and the third adhesive coating 2432 is blue.

[0154] In this embodiment, by applying adhesive coatings of different colors so that the first insulator 241 and the third insulator 243 have different colors, it can be ensured that the first insulator 241 and the third insulator 243 will not be pasted upside down, which can play a fool-proof role.

[0155] In some embodiments, the first adhesive coating 2412 is spaced apart from the first connection 203 , and / or the third adhesive coating 2432 is spaced apart from the second connection 204 .

[0156] In the embodiment of the present application, in the expansion direction Y of the insulating member 24, the size of the first adhesive coating 2412 and the first insulating layer 2411 may be the same or different. Similarly, in the expansion direction Y of the insulating member 24, the size of the third adhesive coating 2432 and the third insulating layer 2431 may be the same or different.

[0157] For example, when the first adhesive coating 2412 and the first insulating layer 2411 have the same size, the second insulator 242 may extend beyond the first connection 203. When the third adhesive coating 2432 and the third insulating layer 2431 have the same size, the second insulator 242 may extend beyond the second connection 204.

[0158] For another example, when the size of the first adhesive coating 2412 is smaller than the first insulating layer 2411, the second insulator 242 may not extend beyond the first connection 203, while the side of the first adhesive coating 2412 close to the second insulator 242 is not flush with the first insulating layer 2411, and the first insulating layer 2411 extends beyond the first connection 203. When the size of the third adhesive coating 2432 is smaller than the third insulating layer 2431, the second insulator 242 may not extend beyond the second connection 204, while the side of the third adhesive coating 2432 close to the second insulator 242 is not flush with the third insulating layer 2431, and the third insulating layer 2431 extends beyond the second connection 204. In this embodiment, the first insulating layer 2411 and the second insulating layer 2421 may be fixedly bonded, and the second insulating layer 2421 and the third insulating layer 2431 may be fixedly bonded, on the side of the insulating member 24 away from the tab 221.

[0159] In this embodiment, by spacing the first adhesive coating 2412 and the first connection 203, and / or spacing the third adhesive coating 2432 and the second connection 204, the first connection 203 is not pulled by the first adhesive coating 2412 and the second connection 204 is not pulled by the third adhesive coating 2432 during the unfolding, bending or movement of the pole ear 221, thereby reducing the risk of breakage of the pole ear 221.

[0160] In one example, the first insulator 241 , the second insulator 242 , and the third insulator 243 are integrally formed.

[0161] For example, the first insulating layer 2411 , the second insulating layer 2421 , and the third insulating layer 2431 are integrally formed, and then the first adhesive coating 2412 and the third adhesive coating 2432 are coated on the first insulating layer 2411 and the third insulating layer 2431 , respectively.

[0162] In this embodiment, the first insulator 241 , the second insulator 242 , and the third insulator 243 are integrally provided, so that the strength of the insulating component 24 can be improved and the risk of falling off can be reduced.

[0163] In another example, at least one of the first insulator 241 , the second insulator 242 , and the third insulator 243 is molded independently.

[0164] For example, the first insulator 241 is formed independently, and the second insulator 242 and the third insulator 243 are formed integrally. For another example, the first insulator 241 and the second insulator 242 are formed integrally, and the third insulator 243 is formed independently. For another example, the first insulator 241, the second insulator 242, and the third insulator 243 are each formed independently.

[0165] Optionally, if at least one of the first insulator 241, the second insulator 242 and the third insulator 243 is formed independently, when the insulating member 24 is fixed to the electrode assembly 22, the part including the second insulator 242 can be installed to the corresponding position first, and then the part not including the second insulator 242 can be installed to the corresponding position, and the edge of the part not including the second insulator 242 should press the edge of the part including the second insulator 242. For example, the first insulator 241, the second insulator 242 and the third insulator 243 are each formed independently, and the second insulator 242 is first placed at a position corresponding to the portion from the first connection 203 to the second connection 204 of the pole ear 221, and then the first insulator 241 is fixed to the main body 222 connected to the transition portion 2211 and the third insulator 243 is fixed to the connection portion 2212 connected to the transition portion 2211, wherein the edge of the first insulator 241 presses the edge of the second insulator 242 so that the first insulator 241 and the second insulator 242 can be spliced ​​together, and the edge of the third insulator 243 presses the edge of the second insulator 242 so that the third insulator 243 and the second insulator 242 can be spliced ​​together.

[0166] In this embodiment, at least one of the first insulator 241, the second insulator 242 and the third insulator 243 is formed independently. When a part of the insulating component 24 fails, only the part of the insulator needs to be replaced without replacing the entire insulating component 24, thereby reducing costs.

[0167] The above description is directed to an electrode assembly 22 in a battery cell 20. Figures 10 to 14 The battery cell 20 includes two adjacent electrode assemblies 22 as an example for description. When the battery cell 20 includes a plurality of electrode assemblies 22 , the insulation of the tabs 221 of any two adjacent electrode assemblies 22 is applicable to the following embodiments.

[0168] First, two adjacent electrode assemblies 22 include a first electrode assembly 22a and a second electrode assembly 22b, the first electrode assembly 22a includes a main body 222a and a pole ear 221a, the pole ear 221a of the first electrode assembly 22a includes a transition portion 2211a and a connecting portion 2212a, the second electrode assembly 22b includes a main body 222b and a pole ear 221b, the pole ear 221b of the second electrode assembly 22b includes a transition portion 2211b and a connecting portion 2212b. The electrode lead-out portion corresponding to the first electrode assembly 22a and the electrode lead-out portion corresponding to the second electrode assembly 22b are arranged on the same wall of the battery cell 20, the insulating member 24a corresponding to the first electrode assembly 22a includes a first insulator 241a, a second insulator 242a and a third insulator 243a, the insulating member 24b corresponding to the second electrode assembly 22b includes a first insulator 241b, a second insulator 242b and a third insulator 243b, and Figure 5 Similarly, the first insulator 241a corresponding to the first electrode assembly 22a includes a segment and b segment, the second insulator 242a corresponding to the first electrode assembly 22a includes c segment, the third insulator 243a corresponding to the first electrode assembly 22a includes f segment, d segment is the size of the connection area 202a of the first electrode assembly 22a, and e segment is the size of the third insulator 243a corresponding to the first electrode assembly 22a beyond the connection area 202a. G segment is the distance between the edge of the connection area 202a of the first electrode assembly 22a and the center line of the first electrode assembly 22a and the second electrode assembly 22b. The sizes corresponding to the second electrode assembly 22b can refer to the first electrode assembly 22a, and are not shown in the figure for simplicity.

[0169] It should be understood that the insulating component 24a corresponding to the first electrode assembly 22a and the insulating component 24b corresponding to the second electrode assembly 22b can both adopt the symmetrical structure or the asymmetrical structure described above, and the first insulator 241a and the third insulator 243a included in the insulating component 24a corresponding to the first electrode assembly 22a can be of the same color or different colors, and the first insulator 241b and the third insulator 243b included in the insulating component 24b corresponding to the second electrode assembly 22b can be of the same color or different colors, and the embodiment of the present application is not limited to this.

[0170] In one embodiment, if Fig.10 As shown, the battery cell 20 includes a first electrode assembly 22a and a second electrode assembly 22b adjacent to each other, and an insulating member 24a corresponding to the first electrode assembly 22a and an insulating member 24b corresponding to the second electrode assembly 22b are independently integrally formed.

[0171] Optionally, the insulating member 24a corresponding to the first electrode assembly 22a and the insulating member 24b corresponding to the second electrode assembly 22b are not spliced ​​together. For example, the distance between the insulating member 24a corresponding to the first electrode assembly 22a and the center line of the first electrode assembly 22a and the second electrode assembly 22b is 1mm to 10mm, and the distance between the insulating member 24b corresponding to the second electrode assembly 22b and the center line of the first electrode assembly 22a and the second electrode assembly 22b is 1mm to 10mm. Fig.10 As shown, segment e is segment g minus 1mm to 10mm.

[0172] In other words, only two insulating components are needed for the first electrode assembly 22a and the second electrode assembly 22b. The two insulating components are integrally formed.

[0173] Furthermore, the insulating member 24a corresponding to the first electrode assembly 22a and the insulating member 24b corresponding to the second electrode assembly 22b are arranged at intervals.

[0174] In this embodiment, the insulating component 24a corresponding to the first electrode assembly 22a and the insulating component 24b corresponding to the second electrode assembly 22b are independently integrally formed, which can enhance the overall strength of the insulating component 24a corresponding to the first electrode assembly 22a and the overall strength of the insulating component 24b corresponding to the second electrode assembly 22b, and when the insulating component corresponding to a certain electrode assembly fails, only the corresponding insulating component needs to be replaced, thereby reducing costs.

[0175] In another embodiment, if Fig.11As shown, the battery cell 20 includes adjacent first and second electrode assemblies 22a and 22b, and the third insulator 243a included in the insulating member 24a corresponding to the first electrode assembly 22a and the third insulator 243b included in the insulating member 24b corresponding to the second electrode assembly 22b are integrally formed.

[0176] In other words, the third insulator 243a included in the insulating component 24a corresponding to the first electrode assembly 22a and the third insulator 243b included in the insulating component 24b corresponding to the second electrode assembly 22b are integrally formed.

[0177] In this embodiment, the third insulator 243a included in the insulating component 24a corresponding to the first electrode assembly 22a and the third insulator 243b included in the insulating component 24b corresponding to the second electrode assembly 22b are integrally formed, so that the insulating component 24a corresponding to the first electrode assembly 22a and the insulating component 24b corresponding to the second electrode assembly 22b can be combined together as much as possible to improve production capacity.

[0178] In another embodiment, if Fig.12 As shown, the insulating component 24a corresponding to the first electrode assembly 22a includes a first insulator 241a and a second insulator 242a that are integrally formed, and the insulating component 24b corresponding to the second electrode assembly 22b includes a first insulator 241b and a second insulator 242b that are integrally formed.

[0179] In this embodiment, the third insulator 243a included in the insulating member 24a corresponding to the first electrode assembly 22a and the third insulator 243b included in the insulating member 24b corresponding to the second electrode assembly 22b are integrally formed. For the first electrode assembly 22a and the second electrode assembly 22b, only three insulating members may be required.

[0180] In this embodiment, the first insulator 241a and the second insulator 242a included in the insulating component 24a corresponding to the first electrode assembly 22a are integrally formed, the first insulator 241b and the second insulator 242b included in the insulating component 24b corresponding to the second electrode assembly 22b are integrally formed, and the third insulator 243a included in the insulating component 24a corresponding to the first electrode assembly 22a and the third insulator 243b included in the insulating component 24b corresponding to the second electrode assembly 22b are integrally formed. When a part of the insulation fails, only the part of the insulator needs to be replaced, thereby reducing costs.

[0181] In another embodiment, if Fig.13As shown, the first insulator 241a included in the insulating component 24a corresponding to the first electrode assembly 22a is formed independently, the second insulator 242a and the third insulator 243a included in the insulating component 24a corresponding to the first electrode assembly 22a and the second insulator 242b and the third insulator 243b included in the insulating component 24b corresponding to the second electrode assembly 22b are formed as one piece, and the first insulator 241b included in the insulating component 24b corresponding to the second electrode assembly 22b is formed independently.

[0182] That is, only three insulating members may be required for the first electrode assembly 22a and the second electrode assembly 22b.

[0183] In this embodiment, the first insulator 241a included in the insulating component 24a corresponding to the first electrode assembly 22a is formed independently, the second insulator 242a and the third insulator 243a included in the insulating component 24a corresponding to the first electrode assembly 22a and the second insulator 242b and the third insulator 243b included in the insulating component 24b corresponding to the second electrode assembly 22b are formed integrally, and the first insulator 241b included in the insulating component 24b corresponding to the second electrode assembly 22b is formed independently. When a part of the insulation fails, only the part of the insulator needs to be replaced, thereby reducing costs.

[0184] In other embodiments, Fig.14 As shown, the insulating component 24a corresponding to the first electrode assembly 22a and the insulating component 24b corresponding to the second electrode assembly 22b are integrally formed.

[0185] In other words, only one sheet of the insulating member is required for the first electrode assembly 22a and the second electrode assembly 22b.

[0186] In this embodiment, the insulating component 24a corresponding to the first electrode assembly 22a and the insulating component 24b corresponding to the second electrode assembly 22b are integrally formed, and only one insulating component needs to be covered between two adjacent electrode assemblies, which reduces the number of splicing times and eliminates the need for fool-proofing, thereby improving production capacity.

[0187] In some embodiments, the electrode lead portion 201 is welded to the connection portion 2212, and the connection region 202 is a welding region.

[0188] In this embodiment, the connection strength between the electrode lead-out portion 201 and the electrode tab 221 can be improved by welding the electrode lead-out portion 201 and the connection portion 2212 .

[0189] like Figure 3 As shown, the electrode lead-out portion 201 may include an electrode terminal 214, and the electrode terminal 214 is welded to the connecting portion 2212; or Figure 4As shown, the electrode lead-out portion 201 may include an electrode terminal 214 and a connecting member 23 , and the connecting portion 2212 is electrically connected to the electrode terminal 214 via the connecting member 23 , and the connecting portion 2212 and the connecting member 23 are welded.

[0190] In this embodiment, the electrode terminal 214 and the connecting portion 2212 are directly welded without connecting through the connecting member 23, which can reduce costs and improve the space utilization of the battery cell 20. The connecting portion 2212 and the electrode terminal 214 are connected through the connecting member 23, which facilitates the connection of the tab 221 and the electrode terminal 214.

[0191] In some embodiments, Figure 5 As shown, the electrode lead portion 21 may be disposed on the first wall of the battery cell 20 , and the transition portion 2211 may be connected between the first end surface 2221 of the main body 222 and the connection portion 2212 , wherein the first end surface 2221 is disposed opposite to the first wall.

[0192] In other words, the transition portion 2211 may be connected to the first end surface 2221 and bent relative to the first end surface 2221 .

[0193] Optionally, the first wall may be any wall of the battery cell 20 , for example, the electrode lead-out portion 201 is disposed on the cover plate 212 .

[0194] In this embodiment, by bending the transition portion 2211 relative to the first end surface 2221 of the main body 222 , the space occupied by the tab 221 can be greatly saved.

[0195] See again Figures 3 to 14 The embodiment of the present application provides a battery cell 20, including a first electrode assembly 22a and a second electrode assembly 22b adjacent to each other, each electrode assembly including a main body 222 and a pole ear 221, the pole ear 221 including a transition portion 2211 and a connecting portion 2212, the transition portion 2211 connects the main body 222 and the connecting portion 2212, and the connecting portion 2212 is connected to the electrode terminal 214 through a connecting member 23 to form a connecting area 202. The first electrode assembly 22a is provided with an insulating member 24a correspondingly, and the second electrode assembly 22b is provided with an insulating member 24b correspondingly, and each insulating member 24 includes a first insulator 241, a second insulator 242, and a third insulator 243, wherein the first insulator 241 is fixed to the main body 222, the third insulator 243 is fixed to the connecting portion 2212, the second insulator 242 is connected between the first insulator 241 and the third insulator 243, and the portion of the tab 221 from the first connection 203 to the second connection 204 is not fixed to the second insulator 242. The insulating member 24a corresponding to the first electrode assembly 22a and the insulating member 24b corresponding to the second electrode assembly 22b are integrally formed.

[0196] In this embodiment, by not fixing the transition portion 2311 to the insulating member 24, it is helpful to solve the problem of the tab 221 being torn due to the bonding force between the insulating member 24 and the tab 221 when the tab 221 is unfolded, bent or moved. In addition, the insulating member 24a corresponding to the first electrode assembly 22 and the insulating member 24b corresponding to the second electrode assembly 22b are integrally formed, and only one insulating member needs to be covered between two adjacent electrode assemblies, which reduces the number of splicing times and does not require foolproofing, thereby improving production capacity.

[0197] The embodiment of the present application also provides a battery, which includes multiple battery cells of the embodiment of the present application.

[0198] An embodiment of the present application further provides an electrical device, comprising the battery of the above embodiment, wherein the battery is used to provide electrical energy to the electrical device.

[0199] The electrical device can be Figure 1 The vehicle shown may also be any device using a battery.

[0200] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: An electrode lead-out portion, used to lead out the electrical energy of the battery cell; An electrode assembly, comprising a main body and a tab, wherein the tab comprises a transition portion and a connecting portion, wherein the transition portion is connected between the connecting portion and the main body, and the connecting portion is connected to the electrode lead-out portion to form a connecting region; an insulating member, the insulating member comprising a first insulator fixed to the main body and a third insulator fixed to the connecting portion, the insulating member further comprising a second insulator connected between the first insulator and the third insulator; The portion of the tab from the first connection point to the second connection point is not fixed to the insulating component, the first connection point is the connection point between the main body and the tab, and the second connection point is the edge of the connection area closest to the transition portion.

2. The battery cell according to claim 1, characterized in that: A portion of the tab from the first connection point to the second connection point is not fixed to the second insulator.

3. The battery cell according to claim 1 or 2, characterized in that: The first insulator includes a first insulating layer and a first adhesive coating, the third insulator includes a third insulating layer and a third adhesive coating, the first insulating layer is bonded to the main body through the first adhesive coating, and the third insulating layer is bonded to the connecting portion through the third adhesive coating; The second insulator includes a second insulating layer, and a surface of the second insulating layer facing the tab is exposed.

4. The battery cell according to claim 1 or 2, characterized in that: The first insulator includes a first insulating layer and a first adhesive coating, the second insulator includes a second insulating layer and a second adhesive coating, and the third insulator includes a third insulating layer and a third adhesive coating; The second insulator further includes a fourth insulating layer, the fourth insulating layer is bonded to the second insulating layer via the second adhesive coating, and the surface of the fourth insulating layer facing the tab is exposed.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The first insulator and the third insulator have the same size along the expansion direction of the insulating member.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The first insulator and the third insulator have different sizes along a development direction of the insulating member.

7. The battery cell according to claim 6, characterized in that: In a development direction of the insulating member, a size of the first insulator is larger than a size of the third insulator.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The first insulator and the third insulator have different colors.

9. The battery cell according to claim 3 or 4, characterized in that: The first adhesive coating layer and the third adhesive coating layer are different in color.

10. The battery cell according to any one of claims 3, 4 and 9, characterized in that: The first adhesive coating is spaced apart from the first connection, and / or the third adhesive coating is spaced apart from the second connection.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The first insulator, the second insulator and the third insulator are integrally formed.

12. The battery cell according to any one of claims 1 to 10, characterized in that: At least one of the first insulator, the second insulator, and the third insulator is molded independently.

13. The battery cell according to any one of claims 1 to 10, characterized in that: The battery cell includes a first electrode assembly and a second electrode assembly that are adjacent to each other, and the insulating member corresponding to the first electrode assembly and the insulating member corresponding to the second electrode assembly are independently integrally formed.

14. The battery cell according to any one of claims 1 to 10, characterized in that: The battery cell includes a first electrode assembly and a second electrode assembly that are adjacent to each other, and the third insulator corresponding to the first electrode assembly and the third insulator corresponding to the second electrode assembly are integrally formed.

15. The battery cell according to claim 14, characterized in that: The first insulator and the second insulator corresponding to the first electrode assembly are integrally formed, and the first insulator and the second insulator corresponding to the second electrode assembly are integrally formed.

16. The battery cell according to claim 14, characterized in that: The first insulator corresponding to the first electrode assembly is formed independently, the first insulator corresponding to the second electrode assembly is formed independently, and the second insulator and the third insulator corresponding to the first electrode assembly are integrally formed with the second insulator and the third insulator corresponding to the second electrode assembly.

17. The battery cell according to claim 14, characterized in that: The insulating component corresponding to the first electrode assembly and the insulating component corresponding to the second electrode assembly are integrally formed.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The electrode lead-out portion and the connection portion are welded, and the connection area is a weld print area.

19. The battery cell according to claim 18, characterized in that: The electrode lead-out portion includes an electrode terminal, and the electrode terminal is welded to the connecting portion; or, The electrode lead-out portion includes an electrode terminal and a connecting member, the connecting portion is electrically connected to the electrode terminal through the connecting member, and the connecting portion is welded to the connecting member.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The electrode lead-out portion is disposed on a first wall of the battery cell, the transition portion is connected between a first end surface of the main body and the connection portion, and the first end surface is disposed opposite to the first wall.

21. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 20.

22. An electrical device, characterized in that: The battery comprises the battery as claimed in claim 21, wherein the battery is used to provide electrical energy to the electrical device.

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