Battery cell, battery assembly, and electric device

Abstract

The embodiment of the present application provides a kind of electric core, battery assembly and electric equipment, including pole core, and the wrapping component of wrapping pole core, wrapping component is the component of non-metal material supposes metal material, wrapping component includes wrapping part and the lead-out part of connecting wrapping part, wrapping part is used to wrap pole core, lead-out part is used to connect power supply.Correspondingly, the metal material of power supply, lead-out part and wrapping part forms heating loop, to generate heat by the metal material in wrapping part, pole core is heated.Utilize the metal material in the wrapping part of wrapping pole core as heating piece, without additional increase heating piece, reduce cost, save battery thickness space, improve the effective capacity of battery.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a battery cell, battery assembly, and electrical device. Background Technology

[0002] With the increasing prevalence of electronic products, soft-pack lithium-ion batteries, with their advantages of light weight, large capacity, and high energy density, are widely used in cameras, laptops, mobile phones, and other fields. Existing lithium-ion rechargeable batteries generally consist of a casing, electrode core, and electrolyte.

[0003] However, the use of lithium-ion batteries is greatly affected by ambient temperature. In low-temperature environments, especially in cold winters, the viscosity of the electrolyte usually increases, which slows down the lithium-ion exchange rate, increases the internal resistance of the battery, makes it easy for the battery capacity to be underutilized, and causes lithium dendrite precipitation in the battery, resulting in safety issues. As a result, lithium-ion batteries are difficult to maintain effective use.

[0004] Currently, external heating is commonly used to improve battery capacity. However, external heating increases costs, has limited temperature improvement, poor reliability, and also reduces battery thickness and capacity. Utility Model Content

[0005] This application provides battery cells, battery modules, and electrical devices to meet the requirements for low-temperature battery use.

[0006] In a first aspect, embodiments of this application provide a battery cell, including...

[0007] Extreme core;

[0008] A packaging assembly that encloses the electrode core; wherein the packaging assembly is a non-metallic material sandwiched with a metallic material; the packaging assembly includes an enclosing portion and a lead-out portion connected to the enclosing portion, the enclosing portion being used to enclose the electrode core, and the lead-out portion being used to connect to a power supply;

[0009] The power supply, the lead-out portion, and the metal material of the wrapping portion form a heating circuit to generate heat through the metal material of the wrapping portion to heat the electrode core.

[0010] In one possible implementation, the lead-out portion includes a first lead-out electrode and a second lead-out electrode; when the first lead-out electrode and the second lead-out electrode are connected to the power supply, the power supply, the first lead-out electrode, the metal material of the wrapping portion, and the second lead-out electrode form a heating circuit.

[0011] In one possible implementation, the wrapping portion includes a first portion located on the upper surface of the pole core and a second portion located on the lower surface of the pole core;

[0012] The first lead is electrically connected to the first part, and the second lead is electrically connected to the second part.

[0013] In one possible implementation, the package portion further includes a side that electrically connects the first portion and the second portion.

[0014] In one possible implementation, both the first lead and the second lead include the metal layer.

[0015] In one possible implementation, the first lead includes the first metal material layer and the metal layer, and the second lead includes the metal layer and the second non-metal material layer.

[0016] In one possible implementation, both the first lead and the second lead include a metal layer and a second non-metallic material layer.

[0017] In one possible implementation, the battery cell further includes: a first tab and a second tab; the first tab and the second tab are electrically connected to the battery cell respectively, and the first tab and the second tab have opposite polarities.

[0018] In one possible implementation, the first lead and the second lead are electrically connected to the first tab and the second tab, respectively, and the electrode core, the first tab, the first lead, the metal material of the encapsulation portion, the second lead, and the second tab form a heating circuit.

[0019] In one possible implementation, the packaging assembly includes: a first non-metallic material, a metal layer, and a second non-metallic material layer stacked sequentially in a direction away from the pole core.

[0020] In one possible implementation, the packaging component includes a packaging film.

[0021] In one possible implementation, the packaging film comprises an aluminum-plastic film, wherein the metal material is aluminum foil.

[0022] In one possible implementation, the first non-metallic material layer comprises a polyamide layer, and the second non-metallic material layer comprises a polyamide layer.

[0023] Secondly, this application provides a battery assembly, including the battery cell described in the first aspect, and a protection board assembly; the protection board assembly and the battery cell are electrically connected.

[0024] In one possible implementation, the lead-out portion includes a first lead-out electrode and a second lead-out electrode; when the first lead-out electrode and the second lead-out electrode are connected to the power supply, the power supply, the first lead-out electrode, the metal material of the wrapping portion, and the second lead-out electrode form a heating circuit.

[0025] In one possible implementation, the battery cell includes a first tab and a second tab, the first tab and the second tab being electrically connected to the battery cell respectively, the first tab and the second tab having opposite polarities.

[0026] In one possible implementation, the protection plate assembly includes: a substrate, a first connector, and a second connector; the first connector is electrically connected to the substrate and the first tab, and the second connector is electrically connected to the substrate and the second tab.

[0027] In one possible implementation, the protection board assembly further includes a third connector and a fourth connector; the third connector is electrically connected to the substrate and the first lead, and the fourth connector is electrically connected to the substrate and the second lead.

[0028] In one possible implementation, at least one of the first connector, the second connector, the third connector, and the fourth connector is disposed on the substrate.

[0029] In one possible implementation, the third connector and the fourth connector are also electrically connected to the first connector and the second connector, respectively.

[0030] In one possible implementation, the third connector and the fourth connector are also electrically connected to an external power source, respectively.

[0031] In one possible implementation, the first lead and the second lead are electrically connected to the first tab and the second tab, respectively; the electrode core, the first tab, the first lead, the metal material of the encapsulation portion, the second lead, and the second tab form a heating circuit.

[0032] In one possible implementation, the protection board assembly includes: a first switch; the first switch is connected to the second tab and the second lead to control the opening or closing of the electrical connection between the second tab and the second lead;

[0033] And / or, the protection board assembly further includes: a second switch; the second switch is connected to the first tab and the first lead to control the opening or closing of the electrical connection between the first tab and the second lead.

[0034] In one possible implementation, the protection board assembly further includes: a first current-limiting resistor; the first current-limiting resistor is connected to the first tab and the first lead;

[0035] And / or, the protection board assembly further includes: a second current-limiting resistor, the second current-limiting resistor being connected to the second tab and the second lead.

[0036] In one possible implementation, the protection board assembly further includes: a protection module; the protection module is connected to the battery cell and is used to perform protection processing on the battery cell, the protection processing including at least one of overcharge protection, over-discharge protection, overcurrent protection and short circuit protection;

[0037] The battery assembly includes a processing module connected to the protection module, the first switch, and the second switch, and is used to control the first switch and the second switch to open or close according to the working state of the protection module.

[0038] In one possible implementation, the number of battery cells is multiple; the protection board assembly includes a first switch and multiple third switches;

[0039] The first tab of the first battery cell is connected to the first lead; the second tab of the Nth battery cell is connected to the first tab of the (N+1)th battery cell, where N is an integer greater than 1.

[0040] The first switch is connected between the second tab and the second lead of the last said cell; each of the third switches is connected between the second lead and the first lead of the adjacent cell.

[0041] In one possible implementation, the number of battery cells is multiple; the protection board assembly includes multiple first switches;

[0042] The first tab and the first lead of each of the battery cells are connected; the second tab of the Nth battery cell is connected to the first tab of the (N+1)th battery cell, where N is an integer greater than 1.

[0043] Each of the first switches is connected between the second tab and the second lead of one of the battery cells.

[0044] In one possible implementation, the number of battery cells is multiple; the protection board assembly includes multiple first switches and multiple third switches;

[0045] The first tab and the first lead of each of the battery cells are connected; each first switch is connected between the second tab and the second lead of one of the battery cells; each third switch is connected between the second lead and the first lead of two adjacent battery cells.

[0046] In one possible implementation, it further includes: step adhesive tape, which is disposed at the sealing step of the battery cell to protect the battery cell.

[0047] In one possible implementation, it further includes: head adhesive tape, the head adhesive tape wrapping the head of the protective plate assembly and the battery cell; the head of the battery cell includes the first lead, the second lead, the first tab and the second tab.

[0048] Thirdly, this application provides an electrical device including the battery assembly described in the second aspect.

[0049] The battery cell, battery assembly, and electrical device provided in this application include an electrode core and a packaging assembly that encloses the electrode core. The packaging assembly is made of non-metallic materials, assuming a metallic material. The packaging assembly includes a wrapping portion and a lead-out portion connecting the wrapping portion. The wrapping portion is used to wrap the electrode core, and the lead-out portion is used to connect to a power supply. Accordingly, the power supply, the lead-out portion, and the metallic material of the wrapping portion form a heating circuit to generate heat through the metallic material in the wrapping portion, thereby heating the electrode core. The solution in this application utilizes the metallic material in the wrapping portion of the electrode core as a heating element, eliminating the need for additional heating elements, reducing costs, saving battery thickness space, and increasing the effective capacity of the battery. Attached Figure Description

[0050] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0051] Figure 1 Schematic diagram of the battery cell provided in this application Figure 1 ;

[0052] Figure 2 Schematic diagram of the battery cell provided in this application Figure 2 ;

[0053] Figure 3 Schematic diagram of the battery cell provided in this application Figure 3 ;

[0054] Figure 4 Schematic diagram of the battery assembly provided in this application Figure 1 ;

[0055] Figure 5Schematic diagram of the battery assembly provided in this application Figure 2 ;

[0056] Figure 6 Schematic diagram of the battery assembly provided in this application Figure 3 ;

[0057] Figure 7 Schematic diagram of switch connection provided in this application Figure 1 ;

[0058] Figure 8 This is a schematic diagram of the heating circuit provided in this application;

[0059] Figure 9 Schematic diagram of switch connection provided in this application Figure 2 ;

[0060] Figure 10 This is a schematic diagram of the resistor connection provided in this application;

[0061] Figure 11 A circuit diagram of the protection module provided in this application;

[0062] Figure 12 Schematic diagram of multi-cell series connection provided in this application Figure 1 ;

[0063] Figure 13 Schematic diagram of multi-cell series connection provided in this application Figure 2 ;

[0064] Figure 14 Schematic diagram of multi-cell series connection provided in this application Figure 3 ;

[0065] Figure 15 A circuit diagram of the protection module provided in this application;

[0066] Figure 16 Schematic diagram of the battery assembly provided in this application Figure 4 ;

[0067] Figure 17 Schematic diagram of the battery assembly provided in this application Figure 5 .

[0068] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0069] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0070] With the increasing prevalence of electronic products, soft-pack lithium-ion batteries, with their advantages of light weight, large capacity, and high energy density, are widely used in cameras, laptops, mobile phones, and other fields. Existing lithium-ion rechargeable batteries generally consist of a casing, electrode core, and electrolyte.

[0071] However, the use of lithium-ion batteries is greatly affected by ambient temperature. In low-temperature environments, especially in cold winters, the viscosity of the electrolyte usually increases, which slows down the lithium-ion exchange rate, increases the internal resistance of the battery, makes it easy for the battery capacity to be underutilized, and causes lithium dendrite precipitation in the battery, resulting in safety issues. As a result, lithium-ion batteries are difficult to maintain effective use.

[0072] Currently, external heating is commonly used to improve battery capacity. However, external heating increases costs, has limited temperature improvement, poor reliability, and also reduces battery thickness and capacity.

[0073] Therefore, this application proposes a battery cell, including an electrode core and a wrapping portion that wraps the electrode core. The metal material in the wrapping portion is used as a heating element to meet the requirements for low-temperature use of the battery, without the need for additional heating elements, thereby reducing costs, saving battery thickness space, and increasing the effective capacity of the battery.

[0074] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0075] Figure 1 The schematic diagram of the battery cell provided in this application is as follows: Figure 1 As shown, the battery cell provided in this application includes:

[0076] The electrode core 101, and the packaging assembly 120 that encloses the electrode core 101; wherein, the packaging assembly 120 is a non-metallic material sandwiching a metallic material.

[0077] The packaging assembly 120 includes a wrapping portion and a lead-out portion that connects to the wrapping portion. The wrapping portion is used to wrap the electrode core 101, and the lead-out portion is used to connect to the power supply.

[0078] The power supply, the lead-out part, and the metal material of the wrapping part form a heating circuit to generate heat through the metal material of the wrapping part to heat the pole core 101.

[0079] In this embodiment, the packaging assembly 120 is a non-metallic material sandwiching a metallic material. The packaging assembly 120 includes a wrapping portion and a lead-out portion. The lead-out portion is used to connect to a power supply. When the lead-out portion is connected to the power supply, current can flow through the metallic material of the wrapping portion, causing the metallic material to generate heat, thereby heating the electrode core 101. Utilizing the metallic material in the packaging assembly 120 wrapping the electrode core 101 as a heating element meets the requirements for low-temperature battery use, eliminates the need for additional heating elements, reduces costs, saves battery thickness space, and increases the effective capacity of the battery.

[0080] In some alternative implementations, such as Figure 2 As shown, the packaging assembly 120 includes a first non-metallic material layer 104, a metal layer 103, and a second non-metallic material layer 102 stacked sequentially in a direction away from the electrode core 101. The first non-metallic material layer 104 provides electrical insulation to prevent internal short circuits in the battery; the metal layer 103 provides excellent gas and moisture barrier properties to prevent oxygen and moisture from the external environment from entering the battery; and the second non-metallic material layer 102 ensures the overall sealing of the packaging assembly and resists the physical and chemical effects of the external environment.

[0081] In one possible implementation, the packaging assembly 120 includes a packaging film that reduces the space occupied by the battery thickness and increases the effective capacity of the battery.

[0082] For example, the packaging film is a composite film of a metal layer and a plastic layer. The metal layer has excellent barrier properties, effectively preventing the penetration of water vapor, oxygen, or other gases. The plastic layer has good sealing and flexibility, allowing the packaging to adapt to changes in the shape and size of the electrode core 101, and also has good chemical stability, resisting the corrosion of the electrolyte.

[0083] In one possible implementation, the packaging film 102 comprises an aluminum-plastic film, and correspondingly, the metal layer 103 of the packaging film 102 is aluminum foil. Aluminum foil provides excellent barrier properties, effectively preventing the penetration of moisture, oxygen, or other gases, protecting the chemical components inside the battery cell. The aluminum-plastic film also has a lighter weight, helping to reduce the overall weight of the battery and increase energy density. Furthermore, the aluminum-plastic film has good flexibility and formability, enabling it to adapt to different shapes and sizes of the electrode core 101 design.

[0084] For example, the packaging film 102 may also include steel-plastic film, copper-plastic film, etc. The metal layer of steel-plastic film is stainless steel foil, and the metal layer of copper-plastic film is copper foil.

[0085] In one possible implementation, the first non-metallic material layer 104 comprises a polypropylene layer, and the second non-metallic material layer 102 comprises a polyamide layer. The polypropylene layer exhibits excellent chemical stability against organic solvents in the electrolyte and can effectively isolate the metal layer 103 from the electrolyte, preventing short circuits. The polyamide layer possesses excellent abrasion resistance and puncture resistance, enabling it to withstand external impacts and friction, protecting the metal layer 103, the polypropylene layer, and the electrode core 101 from physical damage.

[0086] For example, the electrode core 101 is disposed within the packaging assembly 120, such as Figure 1 As shown, the electrode core 101 is located between the two packaging components 120. The electrode core 101 is encapsulated by fusing the polypropylene layers of the two packaging components 120 together. Both packaging components 120 include a polypropylene layer. The polypropylene layer is used as an insulating layer between the electrode core 101 and the metal layer 103. Therefore, the metal layer 103 inside the packaging component 120 is a rectangular conductor that wraps around the electrode core 101.

[0087] For example, packaging component 120 may also include a housing structure.

[0088] For example, the core 101 includes a positive electrode, a negative electrode, and a separator. The separator is located between the positive and negative electrode to prevent direct contact between the positive and negative electrode, which could lead to a short circuit, while allowing ions to pass through. The core may also include an electrolyte that can wet the space between the positive and negative electrode and the separator, allowing ions to move freely between the positive and negative electrodes.

[0089] For example, the external power supply can be either the core or an external power source.

[0090] In some alternative implementations, such as Figure 3 As shown, the lead-out portion includes a first lead-out electrode 122 and a second lead-out electrode 121. When the first lead-out electrode 122 and the second lead-out electrode 121 are connected to a power supply, the power supply, the first lead-out electrode 122, the metal material of the wrapping portion, and the second lead-out electrode 121 form a heating circuit, which can also be called a conductive circuit. Specifically, the power supply, the metal material in the first lead-out electrode 122, the metal material of the wrapping portion, and the metal material in the second lead-out electrode 121 form a heating circuit. Therefore, when the first lead-out electrode 122 and the second lead-out electrode 121 are connected to the power supply, current flows through the metal material of the wrapping portion, thereby generating heat through the metal material of the wrapping portion to heat the electrode core 101.

[0091] For example, the first lead 122 and the second lead 121 are located on the same side of the core 101, which facilitates packaging and helps to achieve connection to the power supply in a smaller space.

[0092] In one possible implementation, such as Figure 3 As shown, the encapsulation portion includes a first portion 123 located on the upper surface of the electrode core 101 and a second portion 124 located on the lower surface of the electrode core 101. A first lead 122 is connected to the first portion 123, and a second lead 121 is connected to the second portion 124, so that the current can be distributed relatively evenly in the encapsulation portion, improving the uniformity of heat distribution and reducing the formation of local hot spots.

[0093] For example, a first lead 122 can be formed by extending the first portion 123, and a second lead 121 can be formed by extending the second portion 124. The extension of the first portion 123 refers to the portion located outside the upper surface of the electrode core 101, and the extension of the second portion 124 refers to the portion located outside the lower surface of the electrode core 101. Furthermore, the extensions of the first portion 123 and the second portion 124 are located on the same side of the electrode core 101. Based on this, there is no need to additionally provide connecting pieces for the metal layer 103 covering the portion, nor to weld the connecting pieces.

[0094] In practical applications, a first lead 122 and a second lead 121 can be provided at the sealing point of the packaging component 120. During the packaging process of the packaging component 120, the first lead 122 and the second lead 121 are reserved to simplify the process.

[0095] In one possible implementation, such as Figure 3 As shown, the wrapping portion also includes a side 125 that electrically connects the first portion 123 and the second portion 124. The side 125 is used to wrap the side of the electrode core 101. It should be noted that only one side is shown in the figure; the wrapping portion can wrap any side of the electrode core 101. When the power supply, the lead-out portion, and the metal material of the wrapping portion form a heating circuit, the metal material of the wrapping portion can generate heat, and the metal material in the side can also generate heat, ensuring uniform heat distribution throughout the electrode core.

[0096] In one possible implementation, both the first lead 122 and the second lead 121 include a metal layer 103. That is, after forming the first lead 122 and the second lead 121, removing the first non-metallic material layer 104 and the second non-metallic material layer 102 from the first lead 122 and the second lead 121 exposes the metal layer 103 in the first lead 122 and the metal layer 103 in the second lead 121. Then, the first lead 122 and the second lead 121 only include a metal layer 103, facilitating connection to a power source. For example, the first lead 122 and the second lead 121 only including a metal layer 103 facilitates connection to the heating contact point of the protection plate 31, which is used to connect to the power source.

[0097] In one possible implementation, the first lead 122 includes a first non-metallic material layer 104 and a metal layer 103, and the second lead 121 includes a metal layer 103 and a second non-metallic material layer 102. That is, the first lead 122 and the second lead 121 are respectively connected to the second non-metallic material layer 102 and the first non-metallic material layer 104.

[0098] For example, the first lead 122 and the second lead 121 are located on the same side of the substrate 31 in the protection plate assembly 3 of the battery cell, which facilitates battery assembly. In order to enhance the strength of the leads, the first lead 122 and the second lead 121 are respectively attached to the second non-metallic material layer 102 and the first non-metallic material layer 104, that is, the first lead 122 includes the first non-metallic material layer 104 and the metal layer 103, and the second lead 121 includes the metal layer 103 and the second non-metallic material layer 102.

[0099] For example, if the encapsulation portion includes a first portion located on the upper surface of the electrode core 101 and a second portion located on the lower surface of the electrode core 101, and a first lead-out electrode 122 is formed by an extension of the first portion and a second lead-out electrode 121 is formed by an extension of the second portion, and if the first lead-out electrode 122 and the second lead-out electrode 121 are disposed on the same side of the substrate 31, the first non-metallic material layer 104 of the first lead-out electrode 122 and the second non-metallic material layer 102 of the second lead-out electrode 121 can be removed. Then, the first lead-out electrode 122 includes a first non-metallic material layer 104 and a metal layer 103, and the second lead-out electrode 121 includes a metal layer 103 and a second non-metallic material layer 102.

[0100] For example, the first non-metallic material layer 104 and / or the second non-metallic material layer 102 of the lead-in electrode can be removed by laser cleaning.

[0101] Based on the above embodiments, there are two possible structures for the lead-out electrode: one where both the first non-metallic material layer 104 and the second non-metallic material layer 102 in the packaging assembly 120 are peeled off, and the other where only one of the first non-metallic material layer 104 and the second non-metallic material layer 102 is peeled off. In the case where both the first non-metallic material layer 104 and the second non-metallic material layer 102 are peeled off, the metal layer 103 (e.g., aluminum foil) is only about 30 to 40 micrometers thick, which can be welded using nanosecond lasers. After welding, additional adhesive needs to be applied to the surface for fixation. The adhesive application area must include both the first non-metallic material layer 104 and the second non-metallic material layer 102 to prevent the aluminum layer from breaking due to direct stress. In the case where only one of the first non-metallic material layer 104 and the second non-metallic material layer 102 is peeled off, the lead-out electrode includes both the metal layer 103 and the first non-metallic material layer 104, or includes both the metal layer 103 and the second non-metallic material layer 102, which enhances the strength of the lead-out electrode. Only conductive adhesive can be used for bonding.

[0102] In one possible implementation, such as Figure 3 As shown, the battery cell also includes a first tab 132 and a second tab 131. The tabs are electrical connectors between the battery core 101 and the external circuit. The first tab 132 and the second tab 131 are electrically connected to the battery core 101, and the polarities of the first tab 132 and the second tab 131 are opposite. For example, the first tab 132 and the second tab 131 are electrically connected to the positive and negative terminals of the battery core 101, respectively.

[0103] In one possible implementation, the first lead 122 and the second lead 121 are electrically connected to the first tab 132 and the first tab 131, respectively. That is, the first tab 132 is connected to the first lead 122, and the second tab 131 is connected to the second lead 121. Thus, the electrode core 101, the first tab 132, the first lead 122, the metal material of the encapsulation portion, the second lead 121, and the second tab 131 form a heating circuit. At this time, the battery cell can supply power to the metal material of the encapsulation portion, causing the metal material to generate heat. The battery cell can then simultaneously heat internally and externally, improving battery heating efficiency.

[0104] For example, the first electrode tab 132 and the second electrode tab 131 can be located between the first lead-out electrode 122 and the second lead-out electrode 121. The positional relationship between the electrode tab and the lead-out electrode can also be determined according to the actual situation, and is not limited here.

[0105] For example, both the first tab 132 and the second tab 131 are provided with tab adhesive. The tabs are insulated from the metal layer 103 in the packaging assembly 120 by the tab adhesive and the first non-metallic material layer 104 in the packaging assembly 120, so as to prevent the tabs from short-circuiting through the metal layer 103 in the packaging assembly 120, and at the same time, to prevent the metal layer 103 from being directly short-circuited and thus unable to form a heating circuit.

[0106] The battery cell provided in this application includes an electrode core and a packaging assembly that encapsulates the electrode core. The metal material in the packaging assembly is used as a heating element, eliminating the need for an additional heating element, reducing costs, saving battery space, and increasing the effective capacity of the battery.

[0107] This application also provides a battery assembly, such as Figures 4-6 As shown, the battery assembly includes a cell 1 and a protection board assembly 3. The protection board assembly 3 is electrically connected to the cell 1 and is used to protect the cell 1.

[0108] In one possible implementation, the lead-out portion of the battery cell 1 includes a first lead 122 and a second lead 121. When the first lead 122 and the second lead 121 are connected to a power supply, the power supply, the first lead 122, the metal material of the wrapping portion, and the second lead 121 form a heating circuit, thereby generating heat through the metal material of the wrapping portion to heat the battery core 101.

[0109] In one possible implementation, the first lead 122 and the second lead 121 are electrically connected to the second tab 131. The electrode core 101, the first tab 132, the first lead 122, the metal material of the encapsulation portion, the second lead 121, and the second tab 131 can form a heating circuit. Power is supplied to the metal material of the encapsulation portion through the electrode core 101, allowing the metal material to generate heat and heat the battery core.

[0110] In one possible implementation, the protection board assembly 3 includes a substrate 31 and a connector 33. The connector 33 includes a third connector 331 and a fourth connector 334. The third connector 331 connects the substrate 31 and the first lead 122, and the fourth connector 334 connects the substrate 31 and the second lead 121. Thus, the connection between the lead and the power supply can be achieved through the third connector 331 and the fourth connector 334.

[0111] For example, the first connector 332 and the second connector 333 can be connected to the lead first, and then to the substrate 3.

[0112] For example, the third connector 331 and the fourth connector 334 can be connected to the substrate 3 via heating contacts on the substrate 3. The third connector 331 and the fourth connector 334 can also be heating contacts on the substrate 3 to realize the connection between the lead-out electrode and the power supply.

[0113] In one possible implementation, such as Figure 4 As shown, the battery cell 1 includes a first tab 132 and a second tab 131. The first tab 132 and the second tab 131 are respectively connected to the electrode core. The polarities of the first tab 132 and the second tab 131 are opposite. For example, the first tab 132 is connected to the positive electrode of the electrode core 101, and the second tab 131 is connected to the negative electrode of the electrode core 101.

[0114] In one possible implementation, the protection board assembly 3 includes a connector 33, which includes a first connector 332 and a second connector 333. The first connector 332 electrically connects to the substrate 31 and the first tab 132, and the second connector 333 electrically connects to the substrate 31 and the second tab 131. The connection between the battery cell 1 and the external circuit can then be achieved through the first connector 332 and the second connector 333 on the protection board assembly 3.

[0115] For example, the first connector 332 and the second connector 333 can be connected to the tab first and then to the substrate 3.

[0116] In one possible implementation, at least one of the first connector 332, the second connector 333, the third connector 331, and the fourth connector 334 is disposed on the substrate 31. The substrate 31 can then serve as a support plate for the connectors and also enable interconnection of the connectors.

[0117] For example, the battery cell polarity typically consists of one aluminum polarity and one copper polarity. The connector material can be nickel, which has good conductivity and corrosion resistance, ensuring long-term battery performance. The connection between the tabs and the connector can be laser welded, as can the connection between the lead-out electrode and the connector.

[0118] In one possible implementation, the third connector 331 and the fourth connector 334 are also electrically connected to the first connector 332 and the second connector 333, respectively. That is, the third connector 331 is connected to the first connector 332, and the fourth connector 334 is connected to the second connector 333. Thus, the first tab 132 and the first lead 122 are connected through the third connector 331 and the first connector 332, and the second tab 131 and the second lead 121 are connected through the fourth connector 334 and the second connector 333. This achieves the connection between the tab and the lead, allowing the battery cell 1 to supply power to the metal material of the encapsulation portion, causing the metal material of the encapsulation portion to generate heat. At this time, the battery cell can simultaneously heat internally and externally, improving the battery heating efficiency.

[0119] For example, the third connector 331 and the fourth connector 334 can also be electrically connected to an external power source, so that the external power source, the first lead 122, the metal material of the wrapping part, and the second lead 121 can form a heating circuit, so that the metal material of the wrapping part generates heat to heat the battery cell.

[0120] For example, when the power supply is cell 1, the protection board assembly 3 may include a switch for controlling whether the tabs and leads are connected, so as to control whether cell 1 supplies power to the metal material of the encasing part.

[0121] In one possible implementation, the protection board assembly 3 further includes a first switch K1, which is connected to the second tab 131 and the second lead 121, such as... Figure 7 As shown, this controls the opening or closing of the electrical connection between the second tab 131 and the second lead 121. The first switch K1 can then control whether the battery cell 1 supplies power to the metal material of the encasing portion.

[0122] For example, when the first switch K1 is closed, a heating circuit can be formed, such as... Figure 8 As shown, at this time, cell 1 can supply power to the metal material of the encapsulated part. When the first switch K1 is open, a heating circuit cannot be formed, and cell 1 cannot supply power to the metal material of the encapsulated part. Considering that electrochemical reactions may occur more easily at high potentials, adding a switch at the negative electrode can reduce the electrochemical instability caused by the switching operation.

[0123] In practical applications, the first switch K1 is in the open state, and when it is necessary to heat the electrode core 101, the first switch K1 is controlled to close.

[0124] For example, the first switch K1 may include a MOSFET.

[0125] In one possible implementation, the protection board assembly 3 further includes a second switch K2, which is connected to the first tab 132 and the first lead 122 to control the opening or closing of the electrical connection between the first tab 132 and the first lead 122. Thus, the second switch K2 can control whether the battery cell 1 supplies power to the metal material of the encasing portion.

[0126] In one possible implementation, the protection board assembly 3 further includes a first switch K1, which is connected to the second tab 131 and the second lead 121 to control the opening or closing of the electrical connection between the second tab 131 and the second lead 121. Thus, the first switch K1 can control whether the battery cell 1 supplies power to the metal material of the encasing portion.

[0127] In one possible implementation, the protection board assembly 3 includes a first switch K1 and a second switch K2. The first switch K1 is connected to the second tab 131 and the second lead 121, and the second switch K2 is connected to the first tab 132 and the first lead 122. Figure 9 As shown, the first switch K1 is used to control the opening or closing of the electrical connection between the second tab 131 and the second lead 121, and the second switch K2 is used to control the opening or closing of the electrical connection between the first tab 132 and the first lead 122. Furthermore, by providing switches at both the positive and negative terminals of the battery cell, the influence of the extremely thin metal layer in the packaging assembly 120 on electrochemical corrosion can be avoided.

[0128] For example, when both the first switch K1 and the second switch K2 are closed, a heating circuit can be formed, and the battery cell 1 can supply power to the metal material of the wrapped part; when either or both of the first switch K1 and the second switch K2 are open, a heating circuit cannot be formed, and the battery cell 1 cannot supply power to the metal material of the wrapped part.

[0129] In one possible implementation, the protection board assembly 3 further includes a first current-limiting resistor, which is connected to the first tab 132 and the first lead 122, such as Figure 10 As shown. When the battery volume is small, the length of the metal material in the packaging assembly 120 is small, resulting in a low total internal resistance of the metal material. A current-limiting resistor is added between the tab and the lead, which is also a current-limiting resistor added in the heating circuit to avoid excessive current.

[0130] In one possible implementation, the protection board assembly 3 further includes a second current-limiting resistor connected to the second tab 131 and the second lead 121, such as... Figure 10 As shown.

[0131] For example, each switch can be disposed on the substrate 31. Each current-limiting resistor can also be disposed on the substrate 31.

[0132] In one possible implementation, the protection board assembly 3 further includes a protection module connected to the battery cell 1, used to protect the battery cell 1. The protection process includes at least one of overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection. The battery also includes a processing module connected to the protection module, a first switch K1, and a second switch K2, used to control the first switch K1 and the second switch K2 to open or close according to the operating state of the protection module.

[0133] For example, when a battery cell is overcharged, the internal side reactions heat up, causing the temperature to rise. Continuing to heat the cell at this point will accelerate the risk of thermal runaway. Therefore, the processing module can control the first switch K1 and the second switch K2 to turn off during the overcharge protection process. Heating the battery cell aims to improve battery performance in low-temperature environments. However, when the cell enters the over-discharge protection state, heating cannot solve the problem of low voltage, and heating the cell consumes additional energy. Therefore, the processing module can control the first switch K1 and the second switch K2 to turn off during the over-discharge protection process. During overcurrent or short circuits, the battery cell generates a large amount of heat instantaneously. Therefore, the processing module can control the first switch K1 and the second switch K2 to turn off during the overcurrent or short circuit protection process. Correspondingly, when the protection module is not in operation, the processing module can control the first switch K1 and the second switch K2 to open.

[0134] The protection board assembly 3 may include not only a protection module with overcharge, over-discharge, overcurrent, and short-circuit protection functions, but also a switch for connecting the heating circuit. This switch can be controlled by a high-level output from the processing module; that is, the switch closes when it receives a high-level signal. If the processing module is a battery management system, the switch in the heating circuit can be controlled by communication between the battery management system and the protection chip, with the protection chip outputting a high-level signal.

[0135] For example, such as Figure 11 As shown, the protection module may include protection chip U1 and protection chip U2. Protection chips U1 and U2 can provide overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection for the battery cell. Two control modules are connected between the positive terminal and the positive output terminal of the battery cell. Protection chip U1 is connected to control module Q1 to control the conduction or cutoff of control module Q1, and protection chip U2 is connected to control module Q2 to control the conduction or cutoff of control module Q2. Thus, the two control modules can control whether to supply power to external devices.

[0136] For example, the control module includes a first MOSFET, a second MOSFET, a first diode, and a second diode. The source of the first MOSFET is connected to the positive terminal of the battery cell, the drain of the first MOSFET is connected to the drain of the second MOSFET, and the source of the second MOSFET is connected to the positive output terminal of the battery cell. The anode of the first diode is connected to the source of the first MOSFET, and the cathode of the first diode is connected to the drain of the first MOSFET. The anode of the second diode is connected to the source of the second MOSFET, and the cathode of the second diode is connected to the drain of the second MOSFET.

[0137] In one possible implementation, such as Figure 4As shown, the protection board assembly 3 also includes solder 32, and the connectors and components are connected to the substrate 31 via the solder 32. The components include at least one of a switch and a current-limiting resistor. The substrate 31 is used to support the heating contacts, connecting pieces, and components.

[0138] For example, the first connector 332, the third connector 331, the fourth connector 334, and the components are all connected to the substrate 31 via solder 32. The components may include switches, current limiting switches, and may also include resistors, capacitors, and other devices in the protection module.

[0139] For example, the substrate 31 may also be provided with a charging interface and a discharging interface as inputs and outputs. The battery can be connected to a charger through the charging interface to replenish the battery's power, and the battery can provide power to external devices through the discharging interface.

[0140] The substrate 31 can be provided with a positive interface and a negative interface for connecting to the battery cell. The positive interface can be connected to the first tab 132, and the negative interface can be connected to the second tab 131. The interface is mainly used for electrical connection and signal transmission, and the connecting piece is mainly used to provide a current conduction path. Therefore, the positive interface can also be connected to the first connector 332, and the negative interface can be connected to the second connector 333, so as to realize the connection between the tab and the lead.

[0141] The substrate 31 may be provided with a first port and a second port that are respectively connected to the first lead 122 and the second lead 121. The first port may also be connected to a third connector 331, and the second port may also be connected to a fourth connector 334, so as to realize the connection between the tab and the lead.

[0142] In one possible implementation, the battery includes multiple cascaded cells, and the protection board assembly 3 includes a first switch K1 and multiple third switches K3, such as... Figure 12 As shown. The first tab 132 of the first cell is connected to the first lead 122, and the second tab 131 of the Nth cell is connected to the first tab 132 of the (N+1)th cell, thus achieving cell cascading, where N is an integer greater than 0. A first switch K1 is connected between the second tab 131 and the second lead 121 of the last cell, and each third switch K3 is connected between the second lead 121 and the first lead 122 of an adjacent cell. When both the first switch K1 and each third switch K3 are closed, the entire group of cells can be heated simultaneously. When not heating, the third switch K3 must be disconnected to prevent the battery from being affected by electrochemical corrosion.

[0143] The applicant also discovered that, due to the low voltage of individual battery cells, multiple cells need to be connected in series to increase the power of the battery pack. However, due to the consistency of the cell manufacturing process and the consistency of the usage environment, differences arise between the cells, further leading to overcharging, over-discharging, and ineffective full charging and discharging of the battery pack, thus reducing battery utilization. The heating circuit formed in this application can also serve as an equalization discharge circuit, and the equalization current of this equalization discharge circuit is much greater than that of existing equalization circuits, which can fulfill the requirements of rapid equalization to ensure battery consistency.

[0144] In one possible implementation, the battery includes multiple cascaded cells, and the protection board assembly 3 includes multiple first switches K1, such as... Figure 13 As shown, the first tab 132 and the first lead 122 of each cell are connected, and the second tab 131 of the Nth cell is connected to the first tab 132 of the (N+1)th cell, thus cascading the cells. Here, N is an integer greater than 0. Each first switch K1 is connected to the second tab 131 and the second lead 121 of one cell. By setting a first switch K1 between the second tab 131 and the second lead 121 of each cell, individual control of whether each cell is heated can be achieved.

[0145] For example, heating can be performed simultaneously or at different times, depending on the needs. Furthermore, this heating circuit can also serve as a discharge circuit during battery equalization; due to its high heating power, high battery equalization power, and short equalization time, rapid battery heating can be achieved.

[0146] In one possible implementation, such as Figure 14 As shown, the battery includes multiple cascaded cells, multiple first switches K1, and multiple third switches K3. Each cell's first tab 132 is connected to its first lead 122. Each first switch K1 is connected between a cell's second tab 131 and second lead 121. Each third switch K3 is connected between the second lead 121 and the first lead 122 of two adjacent cells, thus achieving cascading of the cells. The battery can achieve simultaneous heating of the entire group of cells, or individual heating of each cell.

[0147] For example, when the third switch K3 is closed, the entire group of battery cells can be heated simultaneously; when the third switch K3 is open, each battery cell can be heated individually. Furthermore, the first switch K1 can be used to supply power from the battery cells to the metal material.

[0148] For example, such as Figure 15As shown, when the battery comprises multiple cascaded cells, the protection module may include a protection chip U1. The protection chip U1 can provide overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection for the cells. A control module is connected between the negative terminal and the negative output terminal of the cell. The protection chip U1 is connected to the control module U4, which can be used to turn the control module Q1 on or off, thereby controlling whether the cell supplies power to external devices.

[0149] For example, the control module includes a first MOSFET, a second MOSFET, a first diode, and a second diode. The source of the first MOSFET is connected to the positive terminal of the battery cell, the drain of the first MOSFET is connected to the drain of the second MOSFET, and the source of the second MOSFET is connected to the positive output terminal of the battery cell. The anode of the first diode is connected to the source of the first MOSFET, and the cathode of the first diode is connected to the drain of the first MOSFET. The anode of the second diode is connected to the source of the second MOSFET, and the cathode of the second diode is connected to the drain of the second MOSFET.

[0150] In one possible implementation, the battery also includes a stepped adhesive tape 2, which is disposed at the sealing step 15 of the cell to protect the cell.

[0151] For example, the width of the sealing step 15 is 0.8mm-1.2mm.

[0152] For example, the stepped adhesive tape 2 comprises polyimide (PI) or PI fibers, and its shape can be L-shaped with a thickness of 0.1mm-0.2mm. Since the burrs and sharp edges of the protective plate 31 can easily puncture the packaging film 102, the stepped adhesive tape 2 is provided between the protective plate 31 and the packaging film 102.

[0153] For example, if the substrate 31 is located outside the battery, the L-shaped step adhesive tape 2 can be disregarded.

[0154] For example, the stepped adhesive tape 2 can be adapted to the first lead 122 and the second lead 121. For instance, the stepped adhesive tape 2 needs to be cut and designed according to the shape and size of the lead to ensure complete coverage and protection of the lead area, preventing direct contact between the lead and the external environment, thereby improving the safety and reliability of the battery cell. The lead is the current output part of the battery cell, and the stepped adhesive tape 2 needs to provide good electrical insulation performance to prevent current leakage or short circuits. The stepped adhesive tape 2 can provide additional mechanical strength to protect the lead from external damage. The lead may generate heat during battery cell operation, and the stepped adhesive tape 2 needs to have good thermal stability to ensure that it maintains its protective function under high-temperature conditions.

[0155] In one possible implementation, such as Figure 5As shown, the battery also includes head adhesive tape 4, which is used to wrap the heads of the protection board assembly 3 and the battery cell 1 to protect the battery cell 1 and the protection board assembly 3. The head of the battery cell 1 includes a first lead 122, a second lead 121, a first tab 132, and a second tab 131. Wrapping the protection circuit board and the battery cell head with head adhesive tape 4 can prevent the battery pack from being damaged by short circuits during transportation and output or by impacts during use.

[0156] For example, the battery pack encasing the substrate 31 can be folded up to the cell sealing step 15 position, further reducing the length of the battery, such as... Figure 16 As shown. Alternatively, before applying the head adhesive tape (wrapping adhesive), the connected cell tabs and protection board assembly 3 can be folded up to the cell sealing step 15 position, as shown. Figure 17 As shown, L-shaped step tape needs to be installed at this time.

[0157] This application also provides an electrical device including the aforementioned battery assembly.

[0158] For example, the electrical equipment can be conventional electrical equipment in this field, such as power equipment (e.g., electric vehicles), electronic equipment (e.g., computers, mobile phones, digital cameras, printers, fax machines, etc.), wearable devices (e.g., watches, wristbands, VR glasses, etc.), and home appliances (e.g., air conditioners, refrigerators, washing machines, microwave ovens, etc.), without any particular limitation.

[0159] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A battery cell, characterized in that, include: Extreme Core (101); A packaging assembly (120) that encloses the electrode core (101); wherein the packaging assembly (120) is a non-metallic material sandwiched with a metallic material; the packaging assembly (120) includes an enclosing portion and a lead-out portion connected to the enclosing portion, the enclosing portion being used to enclose the electrode core (101), and the lead-out portion being used to connect to a power supply. The power supply, the lead-out portion, and the metal material of the wrapping portion form a heating circuit to generate heat through the metal material of the wrapping portion to heat the pole core (101).

2. The battery cell according to claim 1, characterized in that, The lead-out portion includes a first lead-out electrode (122) and a second lead-out electrode (121); when the first lead-out electrode (122) and the second lead-out electrode (121) are connected to the power supply, the power supply, the first lead-out electrode (122), the metal material of the wrapping portion, and the second lead-out electrode (121) form a heating circuit.

3. The battery cell according to claim 2, characterized in that, The packaged portion includes a first portion located on the upper surface of the pole core (101) and a second portion located on the lower surface of the pole core (101); The first lead (122) is electrically connected to the first part, and the second lead (121) is electrically connected to the second part.

4. The battery cell according to claim 3, characterized in that, The package portion also includes a side that electrically connects the first portion and the second portion.

5. The battery cell according to claim 2, characterized in that, Both the first lead (122) and the second lead (121) include a metal layer (103).

6. The battery cell according to claim 2, characterized in that, The first lead-out electrode (122) includes a first non-metallic material layer (104) and a metal layer (103), and the second lead-out electrode (121) includes the metal layer (103) and the second non-metallic material layer (102).

7. The battery cell according to claim 2, characterized in that, Both the first lead (122) and the second lead (121) include a metal layer (103) and a second non-metallic material layer (102).

8. The battery cell according to claim 2, characterized in that, The battery cell further includes a first tab (132) and a second tab (131); the first tab (132) and the second tab (131) are electrically connected to the battery core (101), and the first tab (132) and the second tab (131) have opposite polarities.

9. The battery cell according to claim 8, characterized in that, The first lead-out electrode (122) and the second lead-out electrode (121) are electrically connected to the first electrode tab (132) and the second electrode tab (131) respectively. The electrode core (101), the first electrode tab (132), the first lead-out electrode (122), the metal material of the wrapping part, the second lead-out electrode (121) and the second electrode tab (131) form a heating circuit.

10. The battery cell according to any one of claims 1-9, characterized in that, The packaging assembly (120) includes a first non-metallic material layer (104), a metal layer (103), and a second non-metallic material layer (102) stacked sequentially in a direction away from the pole core (101).

11. The battery cell according to any one of claims 1-9, characterized in that, The packaging component (120) includes a packaging film.

12. The battery cell according to claim 11, characterized in that, The packaging film includes an aluminum-plastic film, and the metal material is aluminum foil.

13. The battery cell according to claim 10, characterized in that, The first non-metallic material layer (104) includes a polyamide layer, and the second non-metallic material layer (102) includes a polyamide layer.

14. A battery assembly, characterized in that, It includes the battery cell (1) as described in any one of claims 1-13, and the protection board assembly (3); the protection board assembly (3) and the battery cell (1) are electrically connected.

15. The battery assembly according to claim 14, characterized in that, The lead-out portion includes a first lead-out electrode (122) and a second lead-out electrode (121); when the first lead-out electrode (122) and the second lead-out electrode (121) are connected to the power supply, the power supply, the first lead-out electrode (122), the metal material of the wrapping portion, and the second lead-out electrode (121) form a heating circuit.

16. The battery assembly according to claim 15, characterized in that, The battery cell (1) includes a first tab (132) and a second tab (131), the first tab (132) and the second tab (131) being electrically connected to the battery core (101), and the first tab (132) and the second tab (131) having opposite polarities.

17. The battery assembly according to claim 16, characterized in that, The protection plate assembly (3) includes: a substrate (31), a first connector (332), and a second connector (333); the first connector (332) is electrically connected to the substrate (31) and the first tab (132), and the second connector (333) is electrically connected to the substrate (31) and the second tab (131).

18. The battery assembly according to claim 17, characterized in that, The protection board assembly (3) further includes a third connector (331) and a fourth connector (334); the third connector (331) is electrically connected to the substrate (31) and the first lead (122), and the fourth connector (334) is electrically connected to the substrate (31) and the second lead (121).

19. The battery assembly according to claim 18, characterized in that, At least one of the first connector (332), the second connector (333), the third connector (331), and the fourth connector (334) is disposed on the substrate (31).

20. The battery assembly according to claim 18, characterized in that, The third connector (331) and the fourth connector (334) are also electrically connected to the first connector (332) and the second connector (333), respectively.

21. The battery assembly according to claim 18, characterized in that, The third connector (331) and the fourth connector (334) are also electrically connected to an external power source, respectively.

22. The battery assembly according to claim 16, characterized in that, The first lead-out electrode (122) and the second lead-out electrode (121) are electrically connected to the first electrode tab (132) and the second electrode tab (131), respectively; the electrode core (101), the first electrode tab (132), the first lead-out electrode (122), the metal material of the wrapping part, the second lead-out electrode (121) and the second electrode tab (131) form a heating circuit.

23. The battery assembly according to claim 16, characterized in that, The protection board assembly (3) includes: a first switch (K1); the first switch (K1) connects the second tab (131) and the second lead (121) to control the opening or closing of the electrical connection between the second tab (131) and the second lead (121); And / or, the protection board assembly (3) further includes: a second switch (K2); the second switch (K2) connects the first tab (132) and the first lead (122) to control the opening or closing of the electrical connection between the first tab (132) and the second lead (121).

24. The battery assembly according to claim 23, characterized in that, The protection board assembly (3) further includes: a first current-limiting resistor; the first current-limiting resistor is connected to the first tab (132) and the first lead (122); And / or, the protection board assembly (3) further includes: a second current-limiting resistor; the second current-limiting resistor is connected to the second tab (131) and the second lead (121).

25. The battery assembly according to claim 23, characterized in that, The protection board assembly (3) further includes: a protection module; the protection module is connected to the battery cell (1) and is used to perform protection processing on the battery cell (1), the protection processing including at least one of overcharge protection, over-discharge protection, overcurrent protection and short circuit protection; The battery assembly includes a processing module connected to the protection module, the first switch (K1), and the second switch (K2), and is used to control the first switch (K1) and the second switch (K2) to open or close according to the working state of the protection module.

26. The battery assembly according to claim 16, characterized in that, The number of the battery cells (1) is multiple; the protection board assembly (3) includes a first switch (K1) and multiple third switches (K3). The first tab (132) of the first battery cell is connected to the first lead (122); the second tab (131) of the Nth battery cell is connected to the first tab (132) of the (N+1)th battery cell, where N is an integer greater than 0; The first switch (K1) is connected between the second tab (131) and the second lead (121) of the last said cell; each of the third switches (K3) is connected between the second lead (121) and the first lead (122) of the adjacent said cell.

27. The battery assembly according to claim 16, characterized in that, The number of the battery cells (1) is multiple; the protection board assembly (3) has multiple first switches (K1); The first tab (132) and the first lead (122) of each of the battery cells are connected; the second tab (131) of the Nth battery cell is connected to the first tab (132) of the (N+1)th battery cell, where N is an integer greater than 0; Each of the first switches (K1) is connected between the second tab (131) and the second lead (121) of one of the battery cells.

28. The battery assembly according to claim 16, characterized in that, The number of the battery cells (1) is multiple; the protection board assembly (3) includes multiple first switches (K1) and multiple third switches (K3). The first tab (132) and the first lead (122) of each of the cells are connected; each of the first switches (K1) is connected between the second tab (131) and the second lead (121) of one of the cells; each of the third switches is connected between the second lead (121) and the first lead (122) of two adjacent cells.

29. The battery assembly according to any one of claims 14-28, characterized in that, Also includes: Step adhesive tape (2) is provided at the sealing step of the battery cell (1) to protect the battery cell (1).

30. The battery assembly according to any one of claims 16-28, characterized in that, Also includes: Head adhesive tape (4) wraps the head of the protective plate assembly (3) and the battery cell (1); the head of the battery cell (1) includes the first lead (122), the second lead (121), the first tab (132) and the second tab (131).

31. An electrical appliance, characterized in that, Includes the battery assembly as described in any one of claims 14-30.

Images