Battery pack, battery pack and electric device

Abstract

The present disclosure provides a battery pack, a battery pack and an electrical device. The battery pack comprises a plurality of batteries, a plurality of conductive pieces and a plurality of insulating sheets. Each battery is provided with a first pole, a second pole and an explosion-proof valve on the same side of the plurality of batteries, and the polarity of the first pole and the second pole is opposite. Each conductive piece electrically connects the first pole of one of the two adjacent batteries with the second pole of the other, and an insulating gap is provided between the two conductive pieces connected to the first pole and the second pole of the same battery. The plurality of insulating sheets are provided on one side of the plurality of batteries, and at least partially cover the plurality of explosion-proof valves of the plurality of batteries and the plurality of insulating gaps of the plurality of batteries, respectively. Each insulating sheet can be independently lifted relative to other insulating sheets when the corresponding explosion-proof valve is opened. When a certain battery is in thermal runaway, the corresponding insulating sheet will be independently lifted, and the other insulating sheets will remain in place, maintaining the insulation integrity of the non-failed battery area and improving the safety of the battery pack.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and in particular to a battery pack, a battery pack having the battery pack, and an electrical device having the battery pack. Background Technology

[0002] Batteries with positive and negative terminals of opposite polarity are known. Placing the positive and negative terminals on the same side of the battery can shorten the current path and reduce the length of the connectors. However, due to the limited space at the battery end, the conductive parts connected to the positive and negative terminals of the same battery are close together, and the insulation gap between them is usually narrow. To improve the insulation performance of the battery pack, the battery pack also includes an insulating sheet. In related technologies, a single insulating sheet covers one side of the battery pack where the terminals are located. However, when a battery experiences thermal runaway, the ejected high-temperature gas may lift a large portion or even the entire insulating sheet, exposing the insulation gap between adjacent batteries. In this case, the electrolyte or metal particles ejected from the thermally runaway battery may accumulate in the insulation gap between the terminals of adjacent batteries, forming a conductive path and posing a short-circuit risk to adjacent batteries. Utility Model Content

[0003] In view of this, the present disclosure provides a battery pack to at least solve or improve the problem of a high risk of short circuit between adjacent batteries when a certain battery experiences thermal runaway.

[0004] The battery pack disclosed herein includes multiple batteries, multiple conductive elements, and multiple insulating sheets. Each battery has a first terminal, a second terminal, and an explosion-proof valve on the same side of the multiple batteries, with the first and second terminals having opposite polarities. Each conductive element electrically connects the first terminal of one of two adjacent batteries to the second terminal of the other, and an insulating gap is provided between two conductive elements connected to the first and second terminals of the same battery, respectively. Multiple insulating sheets are disposed on one side of the multiple batteries, each at least partially covering the multiple explosion-proof valves of the multiple batteries, and each at least partially covering the multiple insulating gaps of the multiple batteries, wherein each insulating sheet can be independently lifted relative to the other insulating sheets when the corresponding explosion-proof valve is opened.

[0005] When a battery experiences thermal runaway, the sudden increase in internal pressure triggers the explosion-proof valve to open, rapidly releasing high-temperature, high-pressure ejected material to reduce impact on adjacent batteries. At this time, the insulating sheet corresponding to that battery is independently lifted by the high-pressure gas, forming a directional pressure relief channel, while the insulating sheets of other batteries remain in place, continuing to cover their respective insulation gaps, thus maintaining the insulation integrity of the areas of the unaffected batteries. This independent insulation protection significantly improves the safety and reliability of the battery pack under thermal runaway conditions.

[0006] This disclosure also provides a battery pack. The battery pack includes a housing and the aforementioned battery pack housed within the housing.

[0007] This disclosure also provides an electrical appliance. The electrical appliance includes the aforementioned battery pack, or includes the aforementioned battery module. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of the present disclosure.

[0012] Figure 2 for Figure 1 A schematic diagram of the structure of multiple batteries.

[0013] Figure 3 for Figure 1 A schematic front view of multiple batteries.

[0014] Figure 4 yes Figure 3 A schematic enlarged view showing that part A in the middle has an insulating sheet.

[0015] Figure 5 This is a schematic diagram of the structure of an insulating sheet according to an embodiment of the present disclosure.

[0016] Figure 6 This is a schematic diagram of the structure of an insulating sheet according to another embodiment of the present disclosure.

[0017] Figure 7 This is a schematic diagram of the structure of an insulating sheet according to another embodiment of the present disclosure.

[0018] Figure 8 This is a schematic diagram of the structure of an insulating substrate and an insulating sheet according to an embodiment of the present disclosure.

[0019] Figure 9 This is a schematic diagram of the structure of an insulating sheet according to another embodiment of the present disclosure.

[0020] Figure 10 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure.

[0021] Figure 11 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0022] Figure Labels

[0023] 100—Battery pack; 10—Battery; 11—First terminal; 12—Second terminal; 13—Explosion-proof valve; 14—Insulation gap; 20—Conductive component; 30—Insulating sheet; 30a—First insulating sheet; 30b—Second insulating sheet; 30c—Third insulating sheet; 31—First side edge; 32—Second side edge; 321—Weak part; 322—Connecting section; 323—Disconnecting section; 33—Third side edge; 40—Insulating substrate; 200—Battery pack; 210—Box; 220—Box top cover; 230—Battery management system; 300—Electrical equipment. Detailed Implementation

[0024] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0025] refer to Figures 1 to 4 This disclosure provides a battery pack 100. The battery pack 100 includes a plurality of batteries 10, a plurality of conductive elements 20, and a plurality of insulating sheets 30. Each battery 10 has a first terminal 11, a second terminal 12, and an explosion-proof valve 13 on the same side of the plurality of batteries 10. The first terminal 11 and the second terminal 12 have opposite polarities. That is, one of the first terminal 11 and the second terminal 12 is a positive terminal, and the other is a negative terminal. In one example, the first terminal 11 can be a positive terminal, and the second terminal can be a negative terminal. The battery pack 100 can be formed by connecting a plurality of battery cells 10 with equivalent capacity and internal resistance. For example, the plurality of battery cells 10 can be connected in series to form the battery pack 100, or the plurality of battery cells 10 can be connected in parallel to form the battery pack 100, or a portion of the plurality of battery cells 10 can be connected in series and another portion can be connected in parallel to form the battery pack 100.

[0026] Each conductive element 20 electrically connects the first terminal 11 of one of two adjacent batteries 10 to the second terminal 12 of the other. An insulating gap 14 is provided between the two conductive elements 20 connected to the first terminal 11 and the second terminal 12 of the same battery 10. Multiple insulating sheets 30 are disposed on one side of the multiple batteries 10, each at least partially covering the multiple explosion-proof valves 13 of the multiple batteries 10, and each at least partially covering the multiple insulating gaps 14 of the multiple batteries 10. Each insulating sheet 30 can be independently lifted relative to other adjacent insulating sheets when the corresponding explosion-proof valve 13 is opened. The conductive element 20 can electrically connect the terminals of at least two individual batteries 10, i.e., the current output terminals of the battery 10, to realize the series or parallel connection of multiple individual batteries 10.

[0027] For ease of description, in the accompanying drawings of this disclosure, arrows X+ and X- respectively indicate opposite sides in a first direction, and arrows Y+ and Y- respectively indicate opposite sides in a second direction.

[0028] In the battery pack 100, multiple batteries 10 are arranged in an array, with multiple rows of batteries 10 along a first direction, and multiple batteries 10 arranged in each row along a second direction. A first terminal 11, a second terminal 12, and an explosion-proof valve 13 are provided on the same side of the multiple batteries 10; this same side can be either the Z+ side or the Z- side. Adjacent batteries 10 are electrically connected by conductive elements 20, including batteries 10 adjacent to each other along the first and second directions. Each conductive element 20 connects terminals of different polarities of two adjacent batteries 10, such as the positive terminal of any battery 10 to the negative terminal of an adjacent battery 10, to achieve series connection between the batteries 10. An insulating gap 14 is provided between the first terminal 11 and the second terminal 12 of each battery 10 to ensure electrical isolation. This prevents direct contact between the positive and negative terminals from causing a short circuit, ensuring the safe operation of the battery pack 10.

[0029] When a battery 10 experiences thermal runaway, the sudden increase in internal pressure triggers the explosion-proof valve 13 to open, rapidly releasing high-temperature, high-pressure jets. If electrolyte leakage or metal particles accumulate between the terminals of adjacent batteries 10, it may cause an external short circuit in the battery 10. Based on this structure, when a battery 10 experiences thermal runaway, the insulating sheet 30 covering the explosion-proof valve 13 will be independently lifted under the action of high-pressure gas, forming a directional pressure relief channel. Meanwhile, the insulating sheets 30 of the other batteries 10 remain in place, continuing to cover their respective explosion-proof valves 13 and insulation gaps 14, thereby maintaining the insulation integrity of the areas of the undamaged batteries 10. Through independent insulation protection, the safety and reliability of the battery pack 100 under thermal runaway conditions are significantly improved.

[0030] refer to Figures 4 to 6 Multiple insulating sheets 30 can be connected together, or they can be formed as a single unit. That is, insulating sheets 30a, 30b, and 30c are interconnected, with the connection points indicated by dashed lines. Multiple independent insulating sheets 30 can be connected into a single module by bonding or mechanical fixing. Alternatively, an integrated insulating sheet can be directly used to cover the explosion-proof valve 13 and insulation gap 14 of multiple batteries 10 using injection molding or stamping processes, eliminating the need for additional assembly steps. This improves the assembly efficiency and structural stability of the insulating sheets 30, while simplifying the production process.

[0031] Continue to refer to Figure 1 and Figure 5The insulating sheet 30 has a first side edge 31, which connects it to other adjacent insulating sheets. When the corresponding explosion-proof valve 13 is opened, the insulating sheet 30 bends and deforms at the first side edge 31, thus being lifted up; that is, the insulating sheet 30 can deform in the Z-direction. The first side edge 31 of the insulating sheet 30 connects to other adjacent insulating sheets, forming a physical constraint. Other side edges may be completely or partially disconnected from other adjacent insulating sheets, allowing the insulating sheet 30 to be lifted independently under the action of high-pressure gas. These other side edges include three additional edges adjacent to or opposite the first side edge 31. When the explosion-proof valve 13 is opened, the corresponding insulating sheet 30 undergoes a controllable directional folding movement under the action of high-pressure gas, ensuring that the insulating sheet 30 is fully lifted while preventing complete detachment. Simultaneously, the connecting edges can serve as a positioning reference for the insulating sheet 30 during installation, improving alignment accuracy and efficiency during batch assembly.

[0032] Continue to refer to Figure 4 and Figure 5 As one way to achieve this, the insulating sheet 30 is connected to other adjacent insulating sheets only through the first side edge 31 to form a physical constraint, while the other side edges are completely disconnected from other adjacent insulating sheets. This ensures that when any battery 10 thermally runs away, the insulating sheet 30 corresponding to that battery 10 can be lifted up quickly and without obstruction, while the adjacent insulating sheets 30 are not affected.

[0033] refer to Figure 6 As one implementation, the insulating sheet 30 may also have a second side edge 32 adjacent to the first side edge 31. The insulating sheet 30 is also connected to other adjacent insulating sheets through the second side edge 32. The second side edge 32 is provided with a weak portion 321, which breaks when the insulating sheet 30 is lifted. The weak portion 321 may be completely broken in the middle and connected near the third side edge 33, such as... Figure 7 The weak portion 321 can be connected along the dotted line of the second side edge 32. According to the above structure, the insulating sheet 30 is connected to other adjacent insulating sheets via the first side edge 31, forming a physical constraint. The second side edge 32 has a weak portion 321. In the event of thermal runaway of any battery 10, the weak portion 321 of the second side edge 32 of the insulating sheet 30 corresponding to that battery 10 breaks, thereby allowing the insulating sheet 30 to be lifted independently. This ensures the integrity of the insulating sheet 30 in the initial state and allows for rapid breakage during thermal runaway, enabling the corresponding insulating sheet 30 to be lifted independently.

[0034] Continue to refer to Figure 6 and Figure 7The insulating sheet 30 also has a third side edge 33 opposite to the first side edge 31. The weak portion 321 includes a connecting section 322 and a disconnecting section 323 extending along the second side edge 32. The disconnecting section 323 extends from the first side edge 31 to the third side edge 33, and the connecting section 322 extends from the third side edge 33 to the first side edge 31 to the disconnecting section 323. When the explosion-proof valve 13 is opened, the impact force generated by the high-pressure gas will directly act on the corresponding insulating sheet 30. Since the connecting section 322 of the insulating sheet 30 is the weak portion 321, it will break under the impact force, and the insulating sheet 30 will be lifted up independently.

[0035] Continue to refer to Figure 6 and Figure 7 The length of the connecting segment 322 is L1, and the length of the disconnecting segment 323 is L2, with 5% ≤ L1 / L2 ≤ 50%. Preferably, the ratio L1 / L2 can range from 10% to 40%. More preferably, the ratio L1 / L2 can range from 20% to 40%. Alternatively, the ratio L1 / L2 can also be 25%, 30%, or 35%. Based on the above ranges, the installation reliability and responsiveness to impact of the insulating sheet 30 are achieved. If the connecting segment 322 is too short, it may lead to insufficient connection strength and accidental breakage during processing or installation. If the connecting segment 322 is too long, it may delay timely breakage in case of thermal runaway, affecting the independent lifting of the corresponding insulating sheet 30.

[0036] Back Figure 1 and Figure 2 Multiple batteries 10 are arranged in two rows along a first direction, and each row of batteries 10 is arranged along a second direction perpendicular to the first direction. Multiple insulating sheets 30 are arranged in two rows corresponding to the two rows of batteries 10, also along the first direction and the second direction. The first edge of each insulating sheet 30 is located at the end of the insulating sheet 30 closest to the other row of insulating sheets 30 in the first direction. The arrangement of the insulating sheets 30 corresponds one-to-one with the arrangement of the batteries 10, ensuring that the insulating sheets 30 accurately cover each battery 10. Furthermore, in the event of thermal runaway in a single battery 10, the corresponding insulating sheet 30 can be independently lifted, preventing the insulating sheets 30 of other batteries 10 that have not runaway from being accidentally triggered. This avoids electrolyte leakage or accumulation of metal particles between the terminals of adjacent batteries 10, preventing external short circuits in the batteries 10.

[0037] Back Figure 2 and Figure 5The two rows of batteries 10 are cylindrical batteries 10, arranged alternately along a second direction. Two rows of insulating sheets 30 are also arranged alternately along the second direction. One row of insulating sheets 30 includes a first insulating sheet 30a, and the other row includes a second insulating sheet 30b and a third insulating sheet 30c. A portion of the first side edge 31 of the first insulating sheet 30a is connected to the second insulating sheet 30b, and another portion is connected to the third insulating sheet 30c. The two rows of cylindrical batteries 10 are arranged alternately in the second direction, and the corresponding insulating sheets 30 are also arranged alternately, so that the first insulating sheet 30a is simultaneously connected across rows to both the second insulating sheet 30b and the third insulating sheet 30c of the other row. This ensures that when a single insulating sheet 30 is lifted, the first side edge 31 of the first insulating sheet 30a is simultaneously constrained by both the second insulating sheet 30b and the third insulating sheet 30c, preventing tearing at the first side edge 31.

[0038] refer to Figure 8 The battery pack 100 also includes an insulating substrate 40, with multiple insulating sheets 30 integrally formed with the insulating substrate 40. Each insulating sheet 30 is connected to the insulating substrate 40 via a weak portion 321 surrounding it. When an insulating sheet 30 is lifted, the weak portion 321 breaks, causing the insulating sheet 30 to separate from the insulating substrate 40. The insulating sheet 30 is connected to the insulating substrate 40 via the weak portion 321, ensuring that each insulating sheet 30 can respond independently while maintaining the overall structural strength. When the battery 10 experiences thermal runaway, the high-voltage impact force on the corresponding insulating sheet 30 will act on the preset weak portion 321, causing it to break, thus achieving controllable separation and independent lifting of the insulating sheet 30 from the substrate.

[0039] refer to Figure 9 The multiple insulating sheets 30 are not connected to each other. The multiple insulating sheets 30 are independently fixed to the corresponding batteries 10, and there is no stress connection between the multiple insulating sheets 30. This ensures that in the event of thermal runaway of any battery 10, the opening action of its corresponding insulating sheet 30 will not interfere with the adjacent insulating sheets 30 at all.

[0040] Continue to refer to Figure 9 The multiple insulating sheets 30 do not overlap with each other, meaning that the movement of the insulating sheets 30 is completely independent and will not trigger a chain reaction. When one insulating sheet 30 is lifted up by thermal runaway impact, its movement trajectory has no intersection with other insulating sheets 30, fundamentally eliminating stress interference.

[0041] Back Figure 2The battery 10 is a cylindrical battery. A first terminal 11, a second terminal 12, and an explosion-proof valve 13 are located on the end face of the cylindrical battery 10. The second terminal 12 surrounds and is spaced apart from the first terminal 11. The explosion-proof valve 13 is located between the first terminal 11 and the second terminal 12. The first terminal 11 is located at the center of the end face of the battery 10. The first terminal 11 can be the positive terminal. The second terminal 12 is arranged in a ring around the periphery. The second terminal 12 can be the negative terminal. The two are electrically isolated by an insulating gap 14. The explosion-proof valve 13 is located between the first terminal 11 and the second terminal 12, that is, at the insulating gap 14, to prevent short circuits caused by electrolyte or impurities carried by gas contacting the terminals during pressure relief.

[0042] refer to Figures 1 to 9 The insulating sheet 30 is made of ceramicized silicone rubber, glass fiber, or polycarbonate. All three materials are highly insulating, effectively blocking current conduction between batteries 10 and preventing short circuits caused by accidental contact between the battery casing, terminals, or other components. Even in harsh environments such as humidity and high temperatures, its insulation performance does not easily degrade, ensuring long-term reliable electrical isolation.

[0043] <Example Battery Pack>

[0044] According to an embodiment of the present disclosure, a battery pack 200 is in Figure 10 The following is an example illustrating the overall structure of the battery pack 200. It should be noted that the structure of the battery pack 200 is not limited to the description below. For example, one or more elements mentioned below may be omitted or replaced, and their layout relationships may be altered.

[0045] like Figure 10 As shown, the battery pack 200 may include a housing 210, a housing top cover 220, multiple batteries 10, and a battery management system 230. The multiple batteries 10 are electrically connected to each other. The housing 210 is used to house the batteries 10 and the battery management system 230. The batteries 10 are electrically connected to the battery management system 230 to realize the charging and discharging process of the multiple batteries 10. The housing 210 and housing top cover 220 serve as external protective structures, typically made of metal or composite materials, and have waterproof, dustproof, and impact-resistant functions, providing a safe operating environment for the internal components such as the batteries 10 and the battery management system 230.

[0046] The battery pack 200 may also include a battery group composed of multiple batteries 10 connected in series and parallel, and integrate a battery management system 230 (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are housed within the receiving cavity of the housing 210 and sealed by the housing top cover 220, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 200 can serve as a rechargeable battery and a power source for new energy vehicles, primarily used for storing and providing electrical energy.

[0047] <Example Electrical Equipment>

[0048] This utility model embodiment also provides an electrical device 300, which may include the battery pack 200 described above.

[0049] By way of example only, electrical equipment 300 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, engineering vehicles, etc.

[0050] In addition, electrical equipment 300 can also be used for the storage, conversion and release of recyclable electrical energy.

[0051] In a non-restrictive example, refer to Figure 11 The electrical equipment 300 can be an electric vehicle 300, and the battery pack 200 can be used as a power source to provide power to the electric vehicle 300.

[0052] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0053] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0054] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as first pole and second pole), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0055] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0056] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: Multiple batteries, each battery having a first terminal, a second terminal, and an explosion-proof valve on the same side of the multiple batteries, wherein the first terminal and the second terminal have opposite polarities; Multiple conductive elements, each electrically connecting the first terminal of one of two adjacent batteries to the second terminal of the other, with an insulating gap between the two conductive elements connected to the first and second terminals of the same battery respectively; and Multiple insulating sheets are disposed on one side of the multiple batteries, each at least partially covering multiple explosion-proof valves of the multiple batteries and at least partially covering multiple insulation gaps of the multiple batteries, wherein each insulating sheet can be lifted independently relative to other insulating sheets when the corresponding explosion-proof valve is opened.

2. The battery pack according to claim 1, characterized in that, The plurality of insulating sheets are connected together, or the plurality of insulating sheets are formed integrally.

3. The battery pack according to claim 2, characterized in that, The insulating sheet has a first side edge, and the insulating sheet is connected to other insulating sheets through the first side edge. When the corresponding explosion-proof valve is opened, the insulating sheet is bent and deformed at the first side edge and lifted up.

4. The battery pack according to claim 3, characterized in that, The insulating sheet is connected to other insulating sheets only through the first side edge.

5. The battery pack according to claim 3, characterized in that, The insulating sheet also has a second side edge adjacent to the first side edge, and the insulating sheet is also connected to other insulating sheets through the second side edge. The second side edge is provided with a weak part, which breaks when the insulating sheet is lifted.

6. The battery pack according to claim 5, characterized in that, The insulating sheet also has a third side edge opposite to the first side edge, and the weak portion includes a connecting segment and a disconnecting segment extending along the second side edge, the disconnecting segment extending from the first side edge to the third side edge, and the connecting segment extending from the third side edge to the first side edge to the disconnecting segment.

7. The battery pack according to claim 6, characterized in that, The length of the connecting segment is L1, and the length of the disconnected segment is L2, where 5% ≤ L1 / L2 ≤ 50%.

8. The battery pack according to claim 3, characterized in that, The plurality of batteries are arranged in two rows along a first direction, and each row of batteries is arranged along a second direction perpendicular to the first direction. The plurality of insulating sheets are arranged in two rows corresponding to the two rows of batteries, with the two rows of insulating sheets arranged along the first direction and each row of insulating sheets arranged along the second direction. The first side edge of each insulating sheet is located at the end of the insulating sheet in the first direction that is closer to the other row of insulating sheets.

9. The battery pack according to claim 8, characterized in that, The two rows of batteries are two rows of cylindrical batteries, which are arranged alternately along the second direction. The two rows of insulating sheets are also arranged alternately along the second direction. One row of insulating sheets includes a first insulating sheet, and the other row includes a second insulating sheet and a third insulating sheet. A portion of the first side edge of the first insulating sheet is connected to the second insulating sheet, and another portion of the first insulating sheet is connected to the third insulating sheet.

10. The battery pack according to claim 2, characterized in that, It also includes an insulating substrate, wherein the plurality of insulating sheets are integrally formed with the insulating substrate, each insulating sheet being connected to the insulating substrate by a weak portion surrounding it, wherein the weak portion breaks when the insulating sheet is lifted, thereby separating the insulating sheet from the insulating substrate.

11. The battery pack according to claim 1, characterized in that, The plurality of insulating sheets are not connected to each other.

12. The battery pack according to claim 11, characterized in that, The plurality of insulating sheets do not overlap with each other.

13. The battery pack according to claim 1, characterized in that, The battery is a cylindrical battery. The first terminal, the second terminal, and the explosion-proof valve are disposed on the end face of the cylindrical battery. The second terminal surrounds the first terminal and is spaced apart from the first terminal. The explosion-proof valve is disposed between the first terminal and the second terminal.

14. The battery pack according to claim 1, characterized in that, The insulating sheet is made of ceramicized silicone rubber, glass fiber, or polycarbonate.

15. A battery pack, characterized in that, It includes a housing and a battery pack housed in the housing according to any one of claims 1 to 14.

16. An electrical appliance, characterized in that, It includes the battery pack according to any one of claims 1 to 14, or the battery pack according to claim 15.

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