A battery

Abstract

The utility model discloses a battery, including casing, a plurality of positive pole assembly, a plurality of negative pole assembly, positive pole assembly includes positive pole sheet and insulating bag, and positive pole sheet sets up in insulating bag, and negative pole assembly and positive pole assembly are alternately stacked in casing, and negative pole assembly includes negative pole sheet and insulating bag, and negative pole sheet sets up in insulating bag, wherein, insulating bag is equipped with opening, and positive pole sheet or negative pole sheet passes through the opening and goes out insulating bag. The battery solves the technical problem that the connecting portion of the isolation film is easy to break, resulting in the overall failure of the isolation film.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] With the rapid development of new energy vehicles and the energy storage industry, lithium-ion batteries, as energy storage devices with high energy density, high safety, and long cycle life, are constantly evolving in terms of technology, and their structural form is gradually shifting from traditional wound batteries to stacked batteries. Compared with wound batteries, stacked batteries have significant advantages in improving volumetric energy density and cell consistency, making them an important development direction for power batteries.

[0003] In a stacked battery structure, positive electrode plates, negative electrode plates, and separators are stacked alternately to form a cell unit. The separator is located between adjacent electrode plates, and its function is to achieve electrical isolation and ion conduction between the positive and negative electrodes, ensuring the safety and reversibility of the cell at high energy density. In existing technologies, the separator usually adopts an integral continuous structure, with multiple circular regions corresponding to the shape of the electrode plates arranged sequentially along the length direction. Adjacent circular regions are connected by connecting strips to form an integrated structure to meet the requirements of automated high-speed stacking processes.

[0004] However, this type of separator membrane has structural weaknesses at the connection points between circular areas. Due to the narrow width of the connection points and the lack of independent support, they are prone to warping and wrinkling during the stacking process due to localized stress concentration, and in severe cases, even breakage, leading to the overall failure of the separator membrane. Utility Model Content

[0005] One objective of this invention is to provide a battery that addresses the technical problem that the connection points of the separator are prone to breakage, leading to the overall failure of the separator.

[0006] To achieve the above objectives, the present invention provides a solution as follows: a battery comprising: a casing; multiple positive electrode components, each positive electrode component including a positive electrode sheet and an insulating bag, the positive electrode sheet being disposed in the insulating bag; and multiple negative electrode components, the negative electrode components and the positive electrode components being alternately stacked in the casing, each negative electrode component including a negative electrode sheet and an insulating bag, the negative electrode sheet being disposed in the insulating bag; wherein, the insulating bag has an opening through which the positive electrode sheet or the negative electrode sheet passes through the opening into the insulating bag.

[0007] Optionally, the width of the opening is A1, the positive electrode is circular, the negative electrode is circular, and the diameter of the positive or negative electrode is D1, where A1 < D1.

[0008] Optionally, the insulating bag includes a first side and a folded edge, with at least a portion of the opening along the first side, the folded edge being connected to the first side, and the insulating bag folding along the folded edge when it is assembled in the housing.

[0009] Optionally, the opening includes a first opening and a second opening that are interconnected, the maximum distance between the first opening and the second opening is A2, the positive electrode is circular, the negative electrode is circular, the diameter of the positive electrode or the negative electrode is D1, and A2 > D1; the insulating bag includes a second side, the first side and the second side are connected and set at an angle, the first opening is opened along the first side, the second opening is opened along the second side, one end of the folded edge is connected to the first side, and the other end is connected to the second side.

[0010] Optionally, the positive or negative electrode includes a current collector and an active material layer, with the active material layer covering opposite sides of the current collector.

[0011] Optionally, in the thickness direction of the positive electrode sheet, the thickness of the positive electrode sheet or the negative electrode sheet is A3, and the thickness of the active material layer on one side is A4, where 0.14≤A3 / A4≤0.24.

[0012] Optionally, 9μm≤A3≤35μm.

[0013] Optionally, the housing includes a cover and a base, the base having a mounting cavity and a mounting opening, the cover being disposed at the mounting opening to close the mounting opening, and the positive electrode assembly and the negative electrode assembly being alternately stacked in the mounting cavity.

[0014] Optionally, the battery includes a terminal assembly and an insulating portion. The terminal assembly is insulated within the cover and extends through the cover. The positive electrode and the terminal are electrically connected. The insulating portion is located on the side of the cover away from the mounting cavity and covers a portion of the terminal assembly and the cover.

[0015] Optionally, the housing includes a protrusion that protrudes from the cover in a direction away from the mounting cavity, and the base protrudes in a direction away from the mounting cavity to form the protrusion. The protrusion and the cover surround a groove, through which the pole penetrates the groove, and at least a portion of the insulating portion is disposed in the groove.

[0016] The beneficial effects of this utility model are as follows:

[0017] A battery includes a casing, a plurality of positive electrode components, and a plurality of negative electrode components; the positive electrode component includes a positive electrode sheet and an insulating bag, the positive electrode sheet being disposed in the insulating bag, the negative electrode components and the positive electrode components being alternately stacked in the casing, the negative electrode component includes a negative electrode sheet and an insulating bag, the negative electrode sheet being disposed in the insulating bag, wherein the insulating bag has an opening, through which the positive electrode sheet or the negative electrode sheet passes through the opening and exits the insulating bag.

[0018] In practical applications, by separately encapsulating the positive and negative electrodes in insulating bags with openings in the bags, the electrodes can be led out from these openings, achieving an organic unity of functional connection and physical isolation between the electrodes. This structure avoids the weak connection segments formed between electrodes in traditional continuous separators, reducing the risk of separator wrinkles and tears due to localized stress concentration during stacking, thereby improving the mechanical stability and product yield of the stacked structure. Furthermore, the independent encapsulation of the electrodes within the insulating bags effectively prevents direct contact or micro-short circuits between the positive and negative electrodes, enhancing the safety performance of the battery cell. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of the present utility model;

[0021] Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A magnified schematic diagram of a portion of region A in the middle;

[0022] Figure 3 This is a schematic diagram of the structure of the insulating bag not assembled inside the housing according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the insulating bag assembled inside the shell according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the insulating bag not assembled inside the housing according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the insulating bag assembled inside the housing, provided in an embodiment of this utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the insulating bag not assembled inside the housing according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the insulating bag assembled inside the shell according to an embodiment of the present invention;

[0028] Figure 9This is a structural schematic diagram provided by an embodiment of the present invention to illustrate the maximum distance between the first opening and the second opening.

[0029] Explanation of icon numbers:

[0030] 20. Shell; 21. Cover; 22. Base; 221. Mounting cavity; 222. Mounting port; 23. Protrusion; 24. Groove; 30. Positive electrode assembly; 31. Positive electrode sheet; 311. Current collector; 312. Active material layer; 32. Insulating bag; 321. Opening; 3211. First opening; 3212. Second opening; 322. First side; 323. Second side; 324. Folded edge; 40. Negative electrode assembly; 41. Negative electrode sheet; 50. Electrode post; 60. Insulating part; 70. Thickness direction of the electrode sheet. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that the thickness of the insulating diaphragm is generally 1μm to 8μm. The bag shown in the attached figure has a noticeable thickness, but this is only for the purpose of illustrating the technical solution. In reality, this thickness is negligible.

[0033] Please see Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the cross-sectional structure of the battery provided in an embodiment of the present invention. Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A magnified schematic diagram of a portion of region A in the middle. Figure 3 This is a schematic diagram of the structure of the insulating bag 32 not assembled inside the housing 20 according to an embodiment of the present invention.

[0034] This utility model provides a battery, including a housing 20, a plurality of positive electrode components 30, and a plurality of negative electrode components 40; the positive electrode component 30 includes a positive electrode sheet 31 and an insulating bag 32, the positive electrode sheet 31 is disposed in the insulating bag 32, the negative electrode components 40 and the positive electrode components 30 are alternately stacked in the housing 20, the negative electrode component 40 includes a negative electrode sheet 41 and an insulating bag 32, the negative electrode sheet 41 is disposed in the insulating bag 32, wherein the insulating bag 32 has an opening 321, through which the positive electrode sheet 31 or the negative electrode sheet 41 passes through the insulating bag 32.

[0035] In practical applications, by encapsulating the positive electrode 31 and the negative electrode 41 in an insulating bag 32, and creating an opening 321 in the insulating bag 32, the electrode can be led out from the opening 321, achieving an organic unity of functional connection and physical isolation of the electrode. This structure avoids the weak connection segments formed between the electrode in traditional continuous separators, reducing the risk of separator wrinkles and tears due to local stress concentration during stacking, thereby improving the mechanical stability of the stacked structure and product yield. On the other hand, the independent encapsulation of the electrode within the insulating bag 32 effectively prevents direct contact or micro-short circuits between the positive and negative electrode, improving the safety performance of the cell.

[0036] In one embodiment, see Figure 3 and Figure 4 The width of the opening 321 is A1, the positive electrode 31 is circular, the negative electrode 41 is circular, and the diameter of the positive electrode 31 or the negative electrode 41 is D1, where A1 < D1.

[0037] In practical applications, before the positive electrode 31 or negative electrode 41 is accommodated, the width A1 of the opening 321 of the insulating bag 32 is greater than or equal to the diameter D1 of the positive electrode 31 or negative electrode 41. After the positive electrode 31 or negative electrode 41 is accommodated, the opening 321 is partially closed, so that the width A1 of the opening 321 is less than the diameter D1 of the positive electrode 31 or negative electrode 41. By setting the width A1 of the opening 321 of the insulating bag 32 to be less than the diameter D1 of the positive electrode 31 or negative electrode 41 (i.e., A1 < D1), it can be ensured that after the electrode passes through the insulating bag 32, its main body is still reliably covered by the insulating bag 32, with only the tab or lead-out section exposed. This avoids misalignment or exposure of the electrode body during stacking, thereby effectively improving the electrical isolation and structural stability between the electrodes. Meanwhile, the smaller opening size 321 enhances the sealing force of the insulating bag 32 in the opening 321 area, restricting the displacement and rotation of the electrode, preventing electrode displacement or even damage due to assembly stress or vibration, and further improving the safety and reliability of the entire cell structure. This structural design balances the feasibility of electrode lead-out with the integrity of the isolation function, effectively controlling the risk of local electric field concentration and insulation failure while ensuring the feasibility of electrical connection.

[0038] In one embodiment, see Figure 5 and Figure 6 The insulating bag 32 is square and includes a first side 322 and a folded edge 324. At least a portion of the opening 321 is opened along the first side 322. The folded edge 324 is connected to the first side 322. When the insulating bag 32 is assembled in the housing 20, the insulating bag 32 is folded along the folded edge 324.

[0039] In practical applications, when the insulating bag 32 has a square or polygonal structure, by providing a folded edge 324 connected to the first side 322 on the insulating bag 32, the corners of the insulating bag 32 protruding from the edge of the circular housing 20 can be folded in an orderly manner along the folded edge 324 when assembled into the circular housing 20. This effectively gathers the geometric corners, ensuring that the insulating bag 32 fits snugly inside the circular housing 20. This structure not only avoids spatial interference caused by corner stacking or wrinkles, but also reduces the actual width of the opening 321 on the insulating bag 32 by folding the corners, making the width of the opening 321 smaller than the diameter of the electrode, further improving the tightness of the wrapping between the electrode and the insulating bag 32. This design ensures that the electrode can be smoothly led out without being exposed, and significantly enhances the electrical insulation safety and assembly stability at the opening 321, improving the overall safety, reliability, and manufacturing consistency of the battery.

[0040] Further, see Figure 7 , Figure 8 and Figure 9 The opening 321 includes a first opening 3211 and a second opening 3212 that are interconnected. The maximum distance between the first opening 3211 and the second opening 3212 is A2. The positive electrode 31 is circular, and the negative electrode 41 is circular. The diameter of the positive electrode 31 or the negative electrode 41 is D1, where A2 > D1. The insulating bag 32 includes a second side 323. The first side 322 and the second side 323 are connected and set at an angle. The first opening 3211 is opened along the first side 322, and the second opening 3212 is opened along the second side 323. One end of the folded edge 324 is connected to the first side 322, and the other end is connected to the second side 323.

[0041] In practical applications, by designing the opening 321 to include a first opening 3211 and a second opening 3212 that are interconnected and opened along the first side 322 and the second side 323 respectively, and controlling the maximum distance A2 between the first opening 3211 and the second opening 3212 to be greater than the electrode diameter D1, the electrode can smoothly pass through the opening 321 and exit the insulating bag 32 without being limited by the size of the traditional circular opening 321. This effectively improves the process allowance and tolerance during assembly and reduces the risk of jamming caused by misalignment during the insertion of the electrode into the insulating bag 32. Furthermore, the insulating bag 32 is angled by the first side 322 and the second side 323, and a folded edge 324 connects the two. When assembled into the housing 20, the folded edge 324 can be folded along the corner area, so that the insulating bag 32 fits into the circular inner cavity structure of the housing 20. The folded edge 324 closes the first opening 3211 and the second opening 3212, thereby compressing the width of the exposed portion of the electrode to be smaller than the diameter of the electrode after actual assembly. This enhances the covered area and electrical insulation of the electrode, and prevents electrolyte or foreign matter from entering the insulating bag 32, improving the structural sealing and safety of the battery. Overall, this structure, while balancing the adaptability of the opening 321 size and assembly flexibility, significantly optimizes the matching structure between the insulating bag 32 and the electrode, as well as the overall reliability of the battery.

[0042] In this embodiment, the insulating bag 32 is square, with the first side 322 and the second side 323 being two adjacent edges of the insulating bag 32, and the angle between the orientation of the first opening 3211 and the orientation of the second opening 3212 is 90°. In other embodiments, the insulating bag 32 may also be pentagonal, hexagonal, or irregular in shape, or other shapes.

[0043] In one embodiment, see Figure 2 The positive electrode 31 or the negative electrode 41 includes a current collector 311 and an active material layer 312, with the active material layer 312 covering the opposite sides of the current collector 311.

[0044] In practical applications, by designing the positive electrode 31 or negative electrode 41 to include a current collector 311 and active material layers 312 covering their opposite sides, the electrochemical reactions on both sides of the electrode are more balanced, which helps reduce one-sided overheating or local polarization, improving the cycle stability and lifespan of the battery. Furthermore, the current collector 311, located in the middle and covered by the active layers on both sides, has better mechanical support and structural strength, making it less prone to bending or cracking due to local stress during stacking or winding, thus improving the overall assembly yield. This structure ensures both electrochemical performance and structural strength and process reliability, providing a foundation for the realization of high-performance batteries.

[0045] Furthermore, referring to Figure 2In the thickness direction of the positive electrode 31, the thickness of the positive electrode 31 or the negative electrode 41 is A3, and the thickness of the active material layer 312 on one side is A4, 0.14≤A3 / A4≤0.24, 9μm≤A3≤35μm.

[0046] In practical applications, by limiting the ratio between the overall thickness A3 of the positive electrode 31 or negative electrode 41 and the thickness A4 of the single-sided active material layer 312 in the thickness direction to 0.14 ≤ A3 / A4 ≤ 0.24, an excellent balance between structural stability and electrochemical performance can be achieved. On the one hand, when A3 / A4 < 0.14, it means that the active material layer 312 is too thick relative to the current collector 311, which can easily lead to problems such as warping and peeling of the electrode during manufacturing, stacking, or use, resulting in decreased structural stability and mechanical strength. At the same time, it may cause problems such as increased electrode interface resistance and uneven reaction during fast charging. On the other hand, when A3 / A4 > 0.24, it indicates that the current collector 311 is relatively thick, and the proportion of active material is reduced, which not only reduces the energy density per unit volume or unit mass but also causes a decrease in material utilization. Therefore, limiting it to between 0.14 and 0.24 effectively ensures the loading ratio and uniform distribution of active material, taking into account electrochemical performance, energy density, and structural strength, thereby improving the overall battery efficiency and lifespan stability.

[0047] In one embodiment, reference is made to Figure 1 The housing 20 includes a cover 21 and a base 22. The base 22 forms an installation cavity 221 and an installation opening 222. The cover 21 is disposed at the installation opening 222 to close the installation opening 222. The positive electrode assembly 30 and the negative electrode assembly 40 are alternately stacked in the installation cavity 221.

[0048] In practical applications, by constructing the housing 20 as including a cover 21 and a base 22, and forming a mounting cavity 221 and a mounting opening 222 on the base 22, the positive electrode assembly 30 and the negative electrode assembly 40 are alternately stacked in the mounting cavity 221, and the mounting opening 222 is closed by the cover 21, which can significantly improve assembly convenience and structural sealing. Specifically, the mounting cavity 221 provides a stable space for the components, which helps the electrode assemblies maintain a regular stacking order and positional accuracy, preventing displacement or shifting during handling or packaging; the mounting opening 222 allows the electrode assemblies to be smoothly placed into or removed from the mounting cavity 221, improving production assembly efficiency. The mounting opening 222 is closed by the cover 21, which can effectively improve the overall sealing performance of the housing 20, preventing external moisture or impurities from entering the battery, thereby enhancing the safety and environmental adaptability of the cell. At the same time, the cover 21, as an independent structure, facilitates maintenance, replacement, and subsequent processing, improving the modular design level and maintenance convenience of the whole machine. Therefore, this structure can balance assembly efficiency, cell stability, and safety sealing, significantly improving the overall performance of the entire battery.

[0049] In this embodiment, the cover 21 and the base 22 are connected by welding, which is different from the traditional method of stamping the cover 21 and the base 22. The welding method leaves no gap between the cover 21 and the base 22, eliminates the need for sealing rings or other waterproof structures, and results in a stronger connection between the cover 21 and the base 22, which can withstand greater air pressure.

[0050] Furthermore, referring to Figure 1 The battery includes a terminal post 50 assembly and an insulating part 60. The terminal post 50 assembly is insulated on the cover 21 and penetrates the cover 21. The positive electrode 31 and the terminal post 50 are electrically connected. The insulating part 60 is located on the side of the cover 21 away from the mounting cavity 221 and covers part of the terminal post 50 assembly and the cover 21.

[0051] In practical applications, by setting the terminal post 50 assembly and the insulating part 60 on the cover 21, and insulatingly penetrating the cover 21 through the terminal post 50 assembly, the positive electrode 31 can be electrically connected to the terminal post 50. Simultaneously, by setting the insulating part 60 on the side of the cover 21 away from the mounting cavity 221 to cover part of the terminal post 50 assembly and the cover 21, the overall performance of the battery in terms of electrical connection safety, structural stability, and operational reliability can be effectively improved. Specifically, the setting of the terminal post 50 assembly enables a stable and reliable electrical connection between the internal electrode plates of the battery and the external circuit. Furthermore, by insulating the terminal post 50 assembly within the cover 21, short circuits between conductive parts and the casing 20 or external metal components are prevented, improving overall safety. The insulating part 60 is located outside the cover 21 and covers part of the terminal post 50 and the area of ​​the cover 21, effectively preventing leakage or breakdown caused by external contact, conductive foreign objects, or environmental moisture, thereby further improving the insulation protection capability and operational safety of the entire battery structure.

[0052] Furthermore, referring to Figure 1 The housing 20 includes a protrusion 23 that protrudes from the cover 21 in a direction away from the mounting cavity 221. The base 22 protrudes in a direction away from the mounting cavity 221 to form the protrusion 23. The protrusion 23 and the cover 21 surround to form a groove 24. The pole post 50 passes through the groove 24. At least a portion of the insulating part 60 is disposed in the groove 24.

[0053] In practical applications, the protrusion 23 guides the terminal post 50 assembly to the outside of the housing 20 and into the groove 24, thus enabling the terminal post 50 to be led out without occupying the internal stacking space of the battery. This ensures high space utilization of the internal structure and improves the compactness of the external structure. The groove 24 effectively limits and protects the terminal post 50 assembly, making it less prone to displacement or loosening when subjected to external forces or connection operations. It also reduces the exposed height of the terminal post 50, minimizing the risk of contact. The insulating part 60 is disposed inside the groove 24, providing comprehensive coverage of the exposed portion of the terminal post 50 and the inner wall of the groove 24. This effectively prevents the formation of an electrical bridge between the terminal post 50 and the housing 20, thereby reducing the risk of short circuits and enhancing the protection of the terminal post 50 area against humidity, electrochemical corrosion, and contaminants.

[0054] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0055] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0056] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0057] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery, characterized in that, include: case; Multiple positive electrode components, each positive electrode component including a positive electrode sheet and an insulating bag, wherein the positive electrode sheet is disposed in the insulating bag; Multiple negative electrode components are stacked alternately with the positive electrode components in the housing. Each negative electrode component includes a negative electrode sheet and an insulating bag, with the negative electrode sheet disposed in the insulating bag. The insulating bag has an opening through which the positive or negative electrode sheet passes.

2. The battery according to claim 1, characterized in that, The width of the opening is A1, the positive electrode is circular, the negative electrode is circular, and the diameter of the positive electrode or the negative electrode is D1, where A1 < D1.

3. The battery according to claim 1, characterized in that, The insulating bag includes a first side and a folded edge, at least a portion of the opening is formed along the first side, the folded edge is connected to the first side, and when the insulating bag is assembled in the housing, the insulating bag is folded along the folded edge.

4. The battery according to claim 3, characterized in that, The opening includes a first opening and a second opening that are interconnected. The maximum distance between the first opening and the second opening is A2. The positive electrode is circular, the negative electrode is circular, and the diameter of the positive electrode or the negative electrode is D1, where A2 > D1. The insulating bag includes a second side, the first side and the second side are connected and set at an angle, the first opening is opened along the first side, the second opening is opened along the second side, one end of the folded edge is connected to the first side, and the other end is connected to the second side.

5. The battery according to claim 1, characterized in that, The positive electrode or the negative electrode includes a current collector and an active material layer, the active material layer covering the opposite sides of the current collector.

6. The battery according to claim 5, characterized in that, In the thickness direction of the positive electrode sheet, the thickness of the positive electrode sheet or the negative electrode sheet is A3, and the thickness of the active material layer on one side is A4, 0.14≤A3 / A4≤0.

24.

7. The battery according to claim 6, characterized in that, 9μm≤A3≤35μm.

8. The battery according to any one of claims 1 to 7, characterized in that, The housing includes a cover and a base. The base has an installation cavity and an installation opening. The cover is disposed at the installation opening to close the installation opening. The positive electrode assembly and the negative electrode assembly are alternately stacked in the installation cavity.

9. The battery according to claim 8, characterized in that, The battery includes a terminal assembly and an insulating portion. The terminal assembly is insulated from the cover and extends through the cover. The positive electrode and the terminal are electrically connected. The insulating portion is located on the side of the cover away from the mounting cavity and covers a portion of the terminal assembly and the cover.

10. The battery according to claim 9, characterized in that, The housing includes a protrusion that protrudes from the cover in a direction away from the mounting cavity, and the base protrudes in a direction away from the mounting cavity to form the protrusion. The protrusion and the cover surround a groove, the pole penetrates the groove, and at least a portion of the insulating portion is disposed in the groove.

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