Single cell and battery pack

Abstract

The application relates to the technical field of batteries, and specifically discloses a single battery and a battery pack. The single battery comprises a shell with a containing cavity and a battery cell assembly arranged in the containing cavity; and further comprises an electrode and an explosion-proof valve, both of which are arranged on the shell. Specifically, the shell has a first wall plate and a second wall plate which are different from each other, the electrode is arranged on the first wall plate, and the explosion-proof valve is arranged on the second wall plate. Part of the second wall plate protrudes in a direction away from the battery cell assembly to form a boss, the boss is provided with an explosion-proof hole which is in communication with the containing cavity, and the explosion-proof valve is arranged on the boss to close the explosion-proof hole. In the battery pack, the boss and part of the cable tie are located on the same side of the second wall plate. The technical scheme provided by the application can leave a gap between the explosion-proof valve and the battery cell assembly, ensure the smoothness of the explosion-proof valve, and does not additionally occupy the internal space of the battery shell and the space of the battery pack.

Description

[0001] This application claims priority to Chinese Patent Application No. 202422681510.1, filed on November 1, 2024, entitled "Single Battery Cell and Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more particularly to a single cell battery and a battery pack. Background Technology

[0003] As a core technology product in new energy technology, the safety performance of batteries has always been a performance indicator that needs to be given sufficient attention.

[0004] In existing technologies, batteries are designed with thermoelectric separation, that is, the battery electrodes and the explosion-proof valve are designed on different sides of the battery to prevent the electrolyte and high-temperature gas ejected in the event of battery thermal runaway from coming into contact with the electrodes, thereby improving the safety of the battery system.

[0005] However, this design would encroach on the space on the side of the explosion-proof valve. The bare cells inside the battery casing are close to the explosion-proof valve, and the bare cells are prone to accumulating, which would cause the valve to become obstructed. Adding an explosion-proof valve air passage or internal support inside the casing would further encroach on the internal design space of the cells, resulting in a decrease in battery energy density. Utility Model Content

[0006] This application provides a single battery cell and a battery pack that ensures the smooth flow of the explosion-proof valve without taking up additional internal space in the battery casing.

[0007] In a first aspect, this application proposes a single-cell battery, comprising: a casing having a accommodating cavity; a cell assembly disposed within the accommodating cavity; and electrodes and an explosion-proof valve, both disposed on the casing. The casing has a first wall panel and a second wall panel on opposite sides, the electrodes are disposed on the first wall panel, and the explosion-proof valve is disposed on the second wall panel. A portion of the second wall panel protrudes in a direction away from the cell assembly to form a boss, and an explosion-proof hole communicating with the accommodating cavity is provided on the boss. The explosion-proof valve is disposed on the boss to close the explosion-proof hole.

[0008] In this embodiment, the electrodes and the explosion-proof valve are disposed on the first and second wall panels on different sides of the single-cell battery casing, achieving a thermoelectric separation design. This avoids the impact of electrolyte and other emissions from the single-cell battery on the electrodes during thermal runaway, improving the safety performance of the single-cell battery. Furthermore, the second wall panel protrudes outward to form a boss, on which the explosion-proof valve is mounted. This creates a space between the explosion-proof valve and the cell assembly, reducing the possibility of the cell assembly clogging the explosion-proof valve during battery thermal runaway, ensuring smooth discharge of emissions. The boss design does not occupy internal space within the single-cell battery casing, thus maintaining the energy density of the single-cell battery. The explosion-proof valve is installed on the boss through an explosion-proof hole, facilitating installation and reducing manufacturing difficulty.

[0009] As one alternative embodiment of this application, the first wall panel and the second wall panel are located on opposite sides of the housing.

[0010] As one alternative embodiment of this application, the second wall panel includes:

[0011] The base plate has an opening running through it in the direction away from the cell assembly;

[0012] A sealing plate, attached to the periphery of the opening to seal it;

[0013] The sealing plate protrudes from the base plate in the direction away from the cell assembly to form a boss. There is a gap between the sealing plate and the cell assembly. Explosion-proof holes are opened on the sealing plate, and explosion-proof valves are installed in the explosion-proof holes.

[0014] In this embodiment, the boss is designed as a structure in which the base plate and the sealing plate cooperate. When the individual battery is placed in the battery pack, this structure allows the sealing plate to contact the inner wall of the battery pack relatively stably, thereby ensuring the stability of the individual battery placement.

[0015] As one alternative embodiment of this application, the explosion-proof valve includes a frame and an explosion-proof plate connected to the inner ring of the frame, and the sealing plate has a plate surface facing the battery cell assembly;

[0016] The explosion-proof sheet is located on the side of the plate that is away from the battery cell assembly, and the side of the explosion-proof sheet that is away from the battery cell assembly is flush with the side of the sealing plate that is away from the battery cell assembly.

[0017] In this embodiment, there is a gap between the explosion-proof sheet and the plate surface, which further increases the gap between the explosion-proof sheet and the cell assembly, increases the venting space, and can further reduce the blockage of the cell assembly when the single cell experiences thermal runaway.

[0018] As one of the alternative embodiments of this application, a connecting edge is formed at the connection position between the sealing plate and the base plate, and a gap is left between the connecting edge and the edge of the second wall plate.

[0019] As one of the optional embodiments of this application, the connecting edge includes a set of opposing first connecting edges and a set of opposing second connecting edges, wherein the distance between the first connecting edge and the edge of the second wall panel is d mm, satisfying 1 ≤ d.

[0020] In this embodiment, the setting of d being greater than or equal to 1 mm ensures the reliability and operability of welding between the second wall panel and other parts of the outer casing.

[0021] As one of the alternative embodiments of this application, the distance between the second connecting edge and the edge of the second wall panel is D mm, which satisfies 10 ≤ D.

[0022] As one of the alternative embodiments of this application, the height of the protruding boss is H mm, which satisfies 1≤H≤5.

[0023] Secondly, this application also discloses a battery pack, comprising: a housing having a receiving cavity; a battery module disposed within the receiving cavity, including a plurality of the aforementioned single cells, the plurality of single cells being stacked and arranged; and a binding assembly including at least one cable tie, the at least one cable tie surrounding the outer wall of the battery module; wherein a portion of the cable tie contacts the surface of the second wall panel excluding the boss.

[0024] In this embodiment, since the part of the cable tie that contacts the second wall panel protrudes outward relative to the second wall panel, the cable tie itself occupies the space between the second wall panel and the inner wall of the box. Both the boss and the cable tie are set on the side of the single battery cell located on the second wall panel. This allows the boss to at least partially utilize the space occupied by the protruding cable tie, ensuring that it does not encroach on the space inside the cell casing, while also reducing the encroachment on the box space.

[0025] As one of the alternative embodiments of this application, the bundling assembly also includes end plates, which are disposed on both sides of the stack of battery modules, and the two ends of the cable tie are fixed to the two end plates.

[0026] As one of the alternative embodiments of this application, the height of the protrusion of the boss is H mm, and the thickness of the cable tie is h mm, satisfying h≥H.

[0027] In this embodiment, since the height of the protrusion of the boss is less than the height of the cable tie, the boss will not occupy any additional space inside the box, further improving the space utilization of the battery pack. When the boss is flush with the cable tie, the emissions from the individual battery cells will pass over the cable tie after being ejected from the explosion-proof valve, reducing contact with the cable tie. This reduces direct contact between the high-temperature gas and electrolyte and the cable tie, thereby reducing the risk of cable tie insulation failure. Ultimately, this reduces the space occupied inside the box while reducing the impact of thermal runaway on the cable tie.

[0028] One of the above technical solutions has the following advantages or beneficial effects:

[0029] 1. In this embodiment, the electrodes and the explosion-proof valve are disposed on the first and second wall panels on different sides of the single-cell battery casing, achieving a thermoelectric separation design. This avoids the impact of electrolyte and other emissions from the single-cell battery on the electrodes during thermal runaway, improving the safety performance of the single-cell battery. Furthermore, the second wall panel protrudes outward to form a boss, on which the explosion-proof valve is mounted. This allows for a space between the explosion-proof valve and the cell assembly, reducing the likelihood of the cell assembly clogging the explosion-proof valve during battery thermal runaway, thus ensuring smooth discharge of emissions. The explosion-proof valve is installed on the boss through an explosion-proof hole, which facilitates installation and reduces processing difficulty.

[0030] 2. Since the part of the cable tie that contacts the second wall panel protrudes outward relative to the second wall panel, the cable tie itself occupies the space between the second wall panel and the inner wall of the box. Both the boss and the cable tie are set on the side of the single battery cell located on the second wall panel. This allows the boss to at least partially utilize the space occupied by the protruding cable tie. While ensuring that it does not encroach on the space inside the cell casing, it can also reduce the encroachment on the box space. Attached Figure Description

[0031] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0032] Figure 1 This is an exploded view of the overall structure of a single battery cell provided in the embodiments of this application;

[0033] Figure 2 This is an exploded view provided in an embodiment of this application to illustrate the structure of the second wall panel and the explosion-proof valve;

[0034] Figure 3 This is an overall cross-sectional view of a single battery cell provided in an embodiment of this application;

[0035] Figure 4 This is provided by the embodiments of this application. Figure 3 A magnified view of part A in the middle;

[0036] Figure 5 This is a schematic diagram provided in an embodiment of this application to illustrate the distance between the connecting edge and the second wall panel;

[0037] Figure 6 This is an exploded view of the overall structure of the battery pack provided in the embodiments of this application;

[0038] Figure 7 This is an overall cross-sectional view of the battery pack provided in the embodiments of this application;

[0039] Figure 8 yes Figure 7 A magnified view of part B in the middle section;

[0040] Figure 9 This is a structural diagram provided in the embodiments of this application for demonstrating the interaction between cable ties and a battery module.

[0041] Reference numerals: 1. Outer shell; 10. Receiving cavity; 100. Spacer space; 11. First wall panel; 12. Second wall panel; 121. Base plate; 122. Sealing plate; 1220. Plate surface; 13. Shell;

[0042] 2. Battery cell assembly; 21. Main body; 22. Electrode tabs;

[0043] 3. Electrodes;

[0044] 4. Explosion-proof valve; 41. Frame; 42. Explosion-proof plate;

[0045] 5. Boss; 50. Explosion-proof hole;

[0046] 6. Connecting edge; 61. First connecting edge; 62. Second connecting edge;

[0047] 7. Box body; 70. Receiving cavity; 71. Bottom box; 72. Box lid;

[0048] 8. Battery module;

[0049] 9. Bundling assembly; 91. Cable tie; 92. End plate; Z, first direction. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0052] The following is in conjunction with the appendix Figures 1 to 9 This application will be further described below.

[0053] Reference Figure 1This application discloses a single-cell battery. It includes a housing 1 and a cell assembly 2. The housing 1 has a receiving cavity 10, and the cell assembly 2 is disposed within the receiving cavity 10. It also includes electrodes 3 and an explosion-proof valve 4, both disposed on the housing 1. The housing 1 has a first wall plate 11 and a second wall plate 12 on opposite sides. The electrodes 3 are disposed on the first wall plate 11, and the explosion-proof valve 4 is disposed on the second wall plate 12. A portion of the second wall plate 12 protrudes in a direction away from the cell assembly 2 to form a boss 5. The boss 5 has an explosion-proof hole 50 communicating with the receiving cavity 10, and the explosion-proof valve 4 is disposed on the boss 5 to close the explosion-proof hole 50.

[0054] In one example, the first wall panel 11 and the second wall panel 12 are located on opposite sides of the outer casing 1. Specifically, the single battery cell has a first direction Z, the outer casing 1 is generally square, and the outer casing 1 includes a first wall panel 11, a housing 13, and a second wall panel 12 arranged sequentially along the first direction Z. The housing 13 is hollow internally and open at both ends along the first direction Z. The first wall panel 11 covers one open end of the housing 13 along the first direction Z, and the second wall panel 12 covers the other open end of the housing 13 along the first direction Z; this allows the housing 13, the first wall panel 11, and the second wall panel 12 to form a closed accommodating cavity 10. Optionally, both the first wall panel 11 and the second wall panel 12 are welded to the housing 13.

[0055] The battery cell assembly 2 is formed from a positive electrode, a negative electrode, and a separator through a stacking or winding process. The formed battery cell assembly 2 includes a main body 21 and tabs 22. The main body 21 is formed by stacking the positive electrode, negative electrode, and separator. The tabs 22 are formed by stacking tabs of either the positive electrode or the negative electrode. The tabs 22 are connected to corresponding electrodes 3 to achieve electrical connection between the battery cell assembly 2 and the electrodes 3.

[0056] Combination Figure 2 and Figure 3 In this embodiment, the electrode 3 and the explosion-proof valve 4 are disposed on the first wall plate 11 and the second wall plate 12 on different sides of the single cell, realizing a thermoelectric separation design. This avoids the impact of electrolyte and other emissions from the single cell on the electrode 3 during thermal runaway, thus improving the safety performance of the single cell. Furthermore, the second wall plate 12 protrudes outward to form a boss 5, on which the explosion-proof valve 4 is mounted. This allows a space 100 to be formed between the explosion-proof valve 4 and the cell assembly 2, reducing the possibility of the cell assembly 2 blocking the explosion-proof valve 4 during battery thermal runaway, ensuring smooth discharge of emissions. The boss 5 does not occupy the internal space of the single cell casing 1, thereby ensuring the energy density of the single cell. Finally, the explosion-proof valve 4 is installed on the boss 5 through an explosion-proof hole 50, which facilitates the installation of the explosion-proof valve 4 and reduces processing difficulty.

[0057] It should be noted that in some other alternative embodiments, the outer shell 1 may also be in other shapes, such as cylindrical or irregular shapes.

[0058] Reference Figure 2 , Figure 3 and Figure 4 As one optional embodiment of this application, the second wall panel 12 includes a base plate 121 and a sealing plate 122. The base plate 121 has an opening 1210 extending through it in a direction away from the battery cell assembly 2. The opening 1210 and the outer periphery of the base plate 121 are spaced apart. The sealing plate 122 is connected to the periphery of the opening 1210 to close it. The sealing plate 122 protrudes from the base plate 121 in a direction away from the battery cell assembly 2 to form the aforementioned boss 5. The aforementioned gap space 100 is left between the sealing plate 122 and the battery cell assembly 2. An explosion-proof hole 50 is formed on the sealing plate 122, and an explosion-proof valve 4 is disposed within the explosion-proof hole 50.

[0059] Understandably, the sealing plate 122 can be directly welded to the side of the base plate 121 facing away from the cell assembly 2, or it can be welded to the inner wall of the opening 1210, or a raised frame can be provided on the side of the base plate 121 facing away from the cell assembly 2, and the sealing plate 122 can be welded to the raised frame. In short, it is necessary to ensure that there is a gap of 100 between the side of the sealing plate 122 facing the cell assembly 2 and the cell assembly 2, so as to increase the venting space and avoid blockage.

[0060] It should be noted that there are multiple options for the connection structure between the boss 5 and the second wall plate 12. For example, the boss 5 can be formed directly and integrally from the second wall plate 12 by stamping, or the boss 5 can be formed by welding with the second wall plate 12.

[0061] In this embodiment, the boss 5 is designed as a structure in which the base plate 121 and the sealing plate 122 cooperate. When the single battery is placed in the battery pack, this structure is designed so that the sealing plate 122 can contact the inner wall of the battery pack relatively stably, thereby ensuring the stability of the single battery placement.

[0062] Reference Figure 2 and Figure 4 As one optional embodiment of this application, the explosion-proof valve 4 includes a frame 41 and an explosion-proof plate 42 connected to the inner ring of the frame 41. The sealing plate 122 has a plate surface 1220 facing the second wall plate 12, and the explosion-proof plate 42 is located on the side of the plate surface 1220 facing away from the second wall plate 12. The side of the explosion-proof plate 42 facing away from the battery cell assembly 2 is flush with the side of the sealing plate 122 facing away from the battery cell assembly 2, or the side of the explosion-proof plate 42 facing away from the battery cell assembly 2 is closer to the battery cell assembly 2 than the side of the sealing plate 122 facing away from the battery cell assembly 2.

[0063] The frame 41 is designed to facilitate a more convenient and stable welding connection between the explosion-proof sheet 42 and the inner circumferential wall of the explosion-proof hole 50, thereby ensuring that the weaker explosion-proof sheet 42 is the one that is damaged in the event of thermal runaway. Understandably, the connection point between the explosion-proof sheet 42 and the frame 41 can also be weakened, for example, by indentation.

[0064] In this embodiment, the explosion-proof sheet 42 is further away from the battery cell assembly 2 than the plate surface 1220, and there is a gap between the explosion-proof sheet 42 and the plate surface 1220. This further increases the gap between the explosion-proof sheet 42 and the battery cell assembly 2, leaving more venting space. Without increasing the volume, it can further reduce the venting blockage of the battery cell assembly 2.

[0065] Reference Figure 4 and Figure 5 As one of the optional embodiments of this application, a connecting edge 6 is formed at the connection position between the base plate 121 of the boss 5 and the second wall plate 12, and a gap is left between the connecting edge 6 and the edge of the second wall plate 12.

[0066] Specifically, the second wall panel 12 is rectangular. The length direction of the second wall panel 12 is parallel to the length direction of the cell assembly 2, and the width direction of the second wall panel 12 is parallel to the thickness direction of the cell assembly 2. The connecting edge 6 includes a set of opposing first connecting edges 61 and a set of opposing second connecting edges 62. The first connecting edges 61 are opposite each other and are parallel to the short sides of the second wall panel 12, and the second connecting edges 62 are opposite each other and are parallel to the long sides of the second wall panel 12.

[0067] The distance between the first connecting edge 61 and the short side of the second wall panel 12 is the same, both being d mm, satisfying 1 ≤ d. The distance between the second connecting edge 62 and the long side of the second wall panel 12 is the same, both being D mm, satisfying 10 ≤ d. The protrusion height of the boss 5 is H mm, satisfying 1 ≤ H ≤ 5.

[0068] It should be noted that, in this embodiment, the protrusion height of the aforementioned boss 5 is Hmm, which refers to the height of the sealing plate 122 protruding away from the cell assembly 2 relative to the base plate 121 by Hmm. That is, it can be understood that the distance between the side of the sealing plate 122 facing away from the cell assembly 2 and the side of the base plate 121 facing away from the cell assembly 2 is Hmm. This setting ensures a certain gap between the boss 5 and the cell assembly 2 while reducing the space occupied by the boss 5 in the battery pack.

[0069] In this embodiment, setting d to be greater than or equal to 1 mm ensures the reliability and operability of welding between the second wall panel 12 and other parts of the outer casing 1. It is understood that, under current welding processes, d to be greater than or equal to 1 mm is a suitable choice if the second wall panel 12 is to be welded to the casing 13 reliably and conveniently.

[0070] In one optional example, the upper limit of d can be less than or equal to 2 mm. This setting ensures that the distance between the first connecting edge 61 and the edge of the second wall plate 12 is kept within a small range, thereby increasing the area of ​​the boss 5 while maintaining stable welding. This has two advantages: first, it allows the boss 5 to make more sufficient contact with the inner wall of the battery pack when the single cell is placed inside the battery pack, thereby improving stability; second, it increases the volume of the gap space 100 formed between the boss 5 and the cell assembly 2, which can further reduce the blockage of the explosion-proof valve 4 and ensure the smooth discharge of electrolyte and high-temperature gas in the event of thermal runaway of the single cell.

[0071] It should be noted that the values ​​of d and D mentioned above are not strict limitations; in some other cases, the values ​​of d and D can still be adjusted. For example, with improvements in welding processes, d can be chosen to be less than 1 mm.

[0072] Reference Figures 6 to 9 This application also discloses a battery pack, which includes a housing 7, a battery module 8 disposed in the housing 7, and a strapping assembly 9 for securing the battery module 8.

[0073] The housing 7 includes a base 71 and a cover 72. The base 71 has an open receiving cavity 70, and the cover 72 is placed over the opening to close the receiving cavity 70. A battery module 8 is disposed within the receiving cavity 70, and the battery module 8 includes multiple individual batteries as described above, stacked together. A binding assembly 9 includes at least one cable tie 91, which surrounds the outer wall of the battery module 8. A portion of at least one cable tie 91 contacts the surface of the second wall panel 12, excluding the boss 5. Specifically, the cable tie 91 in contact with the second wall panel 12 is located on the side of the second connecting edges 62 that are opposite to each other.

[0074] As one optional embodiment of this application, the bundling assembly 9 further includes end plates 92, which are disposed on both sides of the battery module 8 in the stacking direction, and the two ends of the cable tie 91 are fixed to the two end plates 92. Optionally, the cable tie 91 and the end plates 92 can be connected by bolts or by welding for steel straps.

[0075] It should be noted that in this embodiment, cable ties 91 are provided at both ends in the height direction of the single battery cell, that is, the cable ties 91 and the end plate 92 cooperate to form a binding assembly 9. However, it is not excluded that in other optional embodiments, the cable ties 91 are a continuous strip, arranged in a ring around the outer periphery of the battery module 8.

[0076] In this embodiment, since the part of the cable tie 91 that contacts the second wall panel 12 protrudes outward relative to the second wall panel 12, the cable tie 91 itself occupies the space between the second wall panel 12 and the inner wall of the housing 7. The boss 5 and the cable tie 91 are both located on the side of the single battery cell located on the second wall panel 12. This allows the boss 5 to at least partially utilize the space occupied by the protrusion of the cable tie 91, ensuring that it does not encroach on the space inside the cell housing 13, while also reducing the encroachment on the space of the housing 7.

[0077] Reference Figure 7 and Figure 8 As one of the alternative embodiments of this application, the thickness of the cable tie 91 is h mm, which satisfies h ≥ H.

[0078] In this embodiment, since the height of the protrusion of the boss 5 is less than the height of the protrusion of the cable tie 91, the boss 5 will not occupy any additional space inside the housing 7, thus further improving the space utilization of the battery pack.

[0079] Furthermore, when the side of the boss 5 facing away from the second wall panel 12 is on the same plane as the side of the cable tie 91 facing away from the second wall panel 12, that is, when the explosion-proof valve 4 and the cable tie 91 are at the same height, the discharge from the individual battery is reduced after being ejected from the explosion-proof valve 4, thus reducing contact with the cable tie 91. This reduces the direct contact between the high-temperature gas and electrolyte and the cable tie 91, thereby reducing the risk of insulation failure of the cable tie 91. Ultimately, this reduces the space occupied inside the housing 7 while reducing the impact of thermal runaway on the cable tie 91. In this configuration, the boss 5 can directly contact the inner wall of the housing 7 as a support structure for the individual battery, thus allowing for more stable placement of the individual battery.

[0080] An exhaust structure is provided on the bottom wall of the housing 7 corresponding to the explosion-proof valve 4, facilitating the rapid and smooth discharge of effluent after it exits the explosion-proof valve 4. This involves other improvements to the battery pack, which will not be elaborated upon in this case.

[0081] The above description is only a partial implementation of the embodiments of this application and is not intended to limit the application in any way. The protection scope of the embodiments of this application is not limited thereto. Any simple modifications, equivalent changes and alterations that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A single-cell battery, characterized in that, include: The outer shell (1) has a receiving cavity (10); The battery cell assembly (2) is disposed within the accommodating cavity (10); and, The electrode (3) and the explosion-proof valve (4) are both disposed on the housing (1). The housing (1) has a first wall plate (11) and a second wall plate (12) on opposite sides. The electrode (3) is disposed on the first wall plate (11) and the explosion-proof valve (4) is disposed on the second wall plate (12). In this part, a portion of the second wall panel (12) protrudes in a direction away from the battery cell assembly (2) to form a boss (5), and an explosion-proof hole (50) is provided on the boss (5). The explosion-proof valve (4) is disposed on the boss (5) to close the explosion-proof hole (50).

2. The single-cell battery as described in claim 1, characterized in that, The first wall panel (11) and the second wall panel (12) are located on opposite sides of the outer shell (1).

3. The single-cell battery as described in claim 1, characterized in that, The second wall panel (12) includes: The base plate (121) has an opening (1210) extending through it in a direction away from the cell assembly (2); A sealing plate (122) is attached to the periphery of the opening (1210) to close the opening (1210); The sealing plate (122) protrudes away from the battery cell assembly (2) relative to the base plate (121) to form the boss (5), the explosion-proof hole (50) is opened on the sealing plate (122), and the explosion-proof valve (4) is disposed in the explosion-proof hole (50).

4. The single-cell battery as described in claim 3, characterized in that, The explosion-proof valve (4) includes a frame (41) and an explosion-proof plate (42) connected to the inner ring of the frame (41), and the sealing plate (122) has a plate surface (1220) facing the battery cell assembly (2); The explosion-proof sheet (42) is located on the side of the plate (1220) away from the battery cell assembly (2), and the side of the explosion-proof sheet (42) away from the battery cell assembly (2) is flush with the side of the sealing plate (122) away from the battery cell assembly (2).

5. The single-cell battery as described in claim 3, characterized in that, A connecting edge (6) is formed at the connection position between the sealing plate (122) and the base plate (121), and a gap is left between the connecting edge (6) and the edge of the second wall panel (12).

6. The single-cell battery as described in claim 5, characterized in that, The connecting edge (6) includes a set of opposing first connecting edges (61), the distance between the first connecting edge (61) and the edge of the second wall panel (12) is d mm, satisfying 1 ≤ d.

7. The single-cell battery as described in claim 6, characterized in that, The connecting edge (6) also includes a set of opposing second connecting edges (62), the first connecting edge (61) is connected to the second connecting edge (62), and the distance between the second connecting edge (62) and the edge of the second wall panel (12) is D mm, satisfying 10≤D.

8. The single-cell battery as described in claim 1, characterized in that, The protrusion height of the boss (5) is H mm, which satisfies 1≤H≤5.

9. A battery pack, characterized in that, include: The box (7) has a receiving cavity (70); A battery module (8) is disposed within the receiving cavity (70) and includes a plurality of individual cells as described in any one of claims 1 to 8, wherein the plurality of individual cells are stacked and arranged. The bundling assembly (9) includes at least one cable tie (91) surrounding the outer wall of the battery module (8); At least one portion of the cable tie (91) contacts the surface of the second wall panel (12) excluding the boss (5).

10. The battery pack as claimed in claim 9, characterized in that, The bundling assembly (9) also includes end plates (92), which are disposed on both sides of the stack of the battery module (8), and the two ends of the cable tie (91) are fixed to the two end plates (92).

11. The battery pack as claimed in claim 9, characterized in that, The protrusion height of the boss (5) is H mm, and the thickness of the cable tie (91) is h mm, satisfying h≥H.

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