Battery

Abstract

A battery, comprising: an integrated cell frame comprising a rectangular frame (1), and a terminal assembly (4), a sealing assembly (6) and an explosion-proof valve (7) that are arranged on the rectangular frame (1), the rectangular frame (1) being provided with a terminal mounting hole (16), a liquid injection hole (15) and an explosion-proof hole (17), the terminal assembly (4) being fixed at the terminal mounting hole (16), the sealing assembly (6) being fixed at the liquid injection hole (15), and the explosion-proof valve (7) being fixed at the explosion-proof hole (17); a cell core assembly comprising a cell core (3), an insulating film (33) covering the outer surface of the cell core (3), and a limiting insulator (5), tabs (31, 32) of the cell core (3) being electrically connected to the terminal assembly (4); two shell covers (2) respectively welded to two sides of the rectangular frame (1); and an electrolyte. During processing of the rectangular frame (1), the terminal assembly (4) can be fixed at the terminal mounting hole (16), the sealing assembly (6) at the liquid injection hole (15), and the explosion-proof valve (7) at the explosion-proof hole (17) so as to obtain the integrated cell frame. By replacing the cover plate structure of traditional batteries with the integrated cell frame, a very thin battery structure can be achieved in the battery size design.

Description

A type of battery Technical Field

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

[0002] The existing battery casing includes a cylindrical body and two cover plates. The two cover plates seal both ends of the cylindrical body along its length. An explosion-proof hole is machined into the cylindrical body, while the core mounting hole and electrolyte filling hole are machined into the cover plates. During battery assembly, the core assembly is first installed in the cylindrical body. The terminal assembly is then fixed to the terminal mounting holes in the cover plates. Next, the cover plate with the fixed terminal assembly seals the opening of the cylindrical body. The terminals of the terminal assembly are electrically connected to the tabs of the core assembly. Finally, an explosion-proof valve is installed in the explosion-proof hole, electrolyte is injected, formation is performed, and the sealing assembly seals the electrolyte filling hole.

[0003] In the aforementioned batteries, the cover structure is fixed and the casing processing cost is high, making it impossible to achieve some battery size designs, and the battery assembly efficiency is low.

[0004] Application content

[0005] The technical problem to be solved by this application is to provide a battery that addresses the issues of existing batteries having a fixed cover structure, high casing processing costs, and making it impossible to design certain battery sizes.

[0006] To address the aforementioned technical problems, embodiments of this application provide a battery, comprising:

[0007] An integrated battery cell frame includes a rectangular frame with a accommodating space, a terminal assembly, a sealing assembly, and an explosion-proof valve disposed on the rectangular frame. The rectangular frame is provided with a terminal mounting hole, a liquid injection hole, and an explosion-proof hole. The terminal assembly is fixed at the terminal mounting hole, the sealing assembly is fixed at the liquid injection hole, and the explosion-proof valve is fixed at the explosion-proof hole.

[0008] The electrode core assembly is disposed within the receiving space of the rectangular frame. The electrode core assembly includes an electrode core, an insulating film covering the outer surface of the electrode core, and a limiting insulating member disposed between the electrode core and the rectangular frame. The electrode tab of the electrode core is electrically connected to the electrode post assembly.

[0009] Two caps are welded to both sides of the rectangular frame to seal the receiving space;

[0010] The electrolyte is disposed within a sealed space enclosed by the two shell covers and the rectangular frame.

[0011] Optionally, the rectangular frame of the integrated cell frame includes a first frame edge, a second frame edge, a third frame edge, and a fourth frame edge. The first frame edge and the second frame edge are arranged opposite each other in the horizontal direction, and the third frame edge and the fourth frame edge are arranged opposite each other in the vertical direction, with the third frame edge located above the fourth frame edge.

[0012] Optionally, the pole mounting hole and the injection hole are both located on the third frame edge, and the explosion-proof hole is located on the first frame edge, the second frame edge, or the third frame edge.

[0013] Optionally, the electrode mounting hole is located on the first frame edge or the second frame edge, the liquid injection hole and the electrode mounting hole are located on the same frame edge, and the explosion-proof hole is located on the first frame edge, the second frame edge, or the third frame edge.

[0014] Optionally, the integrated cell frame further includes heat dissipation fins disposed on the outer side of the rectangular frame, the heat dissipation fins being arranged at intervals perpendicular to the outer side of the rectangular frame;

[0015] When the pole mounting hole is located on the third frame edge, the heat dissipation fins are located on the first frame edge and / or the second frame edge.

[0016] When the pole mounting hole is located on the first frame edge or the second frame edge, the heat dissipation fins are located on the third frame edge.

[0017] Optionally, the pole assembly includes:

[0018] A pole, comprising a first pole piece and a second pole piece connected in sequence;

[0019] An outer connecting piece is disposed on the outside of the rectangular frame and is fixedly connected to the first pole piece of the pole post;

[0020] An external insulating component is disposed outside the pole mounting hole, located between the external connecting piece and the rectangular frame;

[0021] An inner insulating component is disposed inside the electrode mounting hole, located between the second electrode component and the rectangular frame of the electrode;

[0022] The first sealing ring is sleeved on the first pole piece. When the pole piece is fixed to the outer connecting piece, the second pole piece abuts the sealing end face of the first sealing ring against the pole mounting hole of the rectangular frame.

[0023] Optionally, the pole post further includes a third pole post fixedly connected to the second pole post, the third pole post and the first pole post being located on opposite sides of the second pole post, and the third pole post being welded and fixed to the tab of the pole core in the pole core assembly.

[0024] Optionally, the thickness of the first electrode post is 0.8 mm to 3.5 mm; the height of the third electrode post is 4 mm to 10 mm.

[0025] Optionally, the first and second electrode members of the electrode post have a circular cross-section, and the electrode post mounting hole is a first circular hole provided on the rectangular frame, the cross-sectional area of ​​the first circular hole being 20 mm². 2 ~60mm 2 .

[0026] Optionally, the explosion-proof hole is a blind hole provided on the rectangular frame, and the explosion-proof valve is a groove provided on the blind hole.

[0027] Optionally, the explosion-proof hole includes a first mounting hole, a second mounting hole, and a pressure relief hole that are connected sequentially from the outside to the inside along the thickness direction of the frame edge.

[0028] Optionally, the explosion-proof valve includes an explosion-proof sheet with grooves and an explosion-proof membrane. The explosion-proof sheet is welded to the second mounting hole, and the explosion-proof membrane is attached to the first mounting hole. There is a first mounting gap between the explosion-proof sheet and the explosion-proof membrane, which is 0.3 mm to 1 mm.

[0029] Optionally, the ratio of the area of ​​the groove to the capacity of the battery is 0.5 to 3.5 mm. 2 / Ah.

[0030] Optionally, the injection hole is a second circular hole disposed on the rectangular frame, and the second circular hole is centrally arranged along the width direction of the rectangular frame; the sealing assembly includes a sealing rivet and a second sealing ring sleeved on the sealing rivet, the sealing rivet is riveted into the second circular hole, and the second sealing ring abuts against the opening of the second circular hole.

[0031] Optionally, the area where the cover and the side of the rectangular frame overlap in the width direction is the welding area between the cover and the integrated cell frame.

[0032] In the battery of this application, since the explosion-proof hole, terminal mounting hole, and electrolyte filling hole are all located on a rectangular frame, the terminal assembly can be fixed to the terminal mounting hole, the sealing assembly to the electrolyte filling hole, and the explosion-proof valve to the explosion-proof hole during the processing of the rectangular frame, thus obtaining an integrated cell frame. Then, the terminal assembly and the casing are assembled onto the integrated cell frame. By replacing the traditional battery cover structure with an integrated cell frame, an extremely thin battery structure can be achieved in the battery size design. At the same time, the integrated cell frame has low processing costs and is suitable for mass production. Compared to assembling individual parts one by one, the battery in this application has a higher degree of integration, thereby improving battery assembly efficiency. Attached Figure Description

[0033] Figure 1 is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0034] Figure 2 is an exploded view of Figure 1;

[0035] Figure 3 is an exploded view of the integrated cell frame in Figure 1;

[0036] Figure 4 is an enlarged view of part A in Figure 3;

[0037] Figure 5 is a schematic diagram of the core assembly in Figure 1;

[0038] Figure 6 is a schematic diagram of the spacer in Figure 5;

[0039] Figure 7 is a cross-sectional view of Figure 1;

[0040] Figure 8 is an enlarged view of part B in Figure 7;

[0041] Figure 9 is a cross-sectional view of Figure 1 from another direction;

[0042] Figure 10 is an enlarged view of section C in Figure 9;

[0043] Figure 11 is a schematic diagram of the structure of a battery provided in another embodiment of this application.

[0044] The reference numerals in the accompanying drawings are as follows:

[0045] 1. Rectangular frame; 11. First frame edge; 12. Second frame edge; 13. Third frame edge; 14. Fourth frame edge; 15. Injection hole; 16. Terminal mounting hole; 17. Explosion-proof hole; 18. Step groove; 19. Heat dissipation fins; 2. Shell cover; 3. Terminal core; 31. Positive electrode tab; 32. Negative electrode tab; 33. Insulating film; 4. Terminal assembly; 41. Outer connecting piece; 42. First sealing ring; 43. Inner insulation component; 44. Outer insulation component 45. First pole piece; 46. Second pole piece; 47. Third pole piece; 5. Limiting insulating component; 51. Insulating fixing plate; 52. Spacer ring; 521. Connecting part; 522. Supporting part; 523. Third base plate; 524. Vertical support plate; 525. Side plate; 526. Circular protrusion; 527. Air passage; 528. Second gap; 6. Sealing component; 7. Explosion-proof valve; 71. Explosion-proof sheet; 72. Explosion-proof membrane. Detailed Implementation

[0046] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] As shown in Figures 1 and 2, one embodiment of this application provides a battery, comprising:

[0048] An integrated cell frame includes a rectangular frame 1 with accommodating space, terminal post assemblies 4, sealing assemblies 6, and explosion-proof valves 7 disposed on the rectangular frame 1. The rectangular frame 1 has terminal post mounting holes 16, electrolyte injection holes 15, and explosion-proof holes 17. The terminal post assembly 4 is fixed at the terminal post mounting hole 16, the sealing assembly 6 is fixed at the electrolyte injection hole 15, and the explosion-proof valve 7 is fixed at the explosion-proof hole 17. This integrated cell frame integrates the electrolyte injection hole 15, the explosion-proof valve 7, and the terminal post assembly 4 onto the rectangular frame 1, and distributes them on different sides of the rectangular frame as needed. The accommodating space within the rectangular frame 1 is used to place the terminal post assembly, providing fixed support for the terminal post assembly, and two housing covers 2 are used to seal the terminal post assembly. This integrated cell frame can be integrated with the terminal post assembly 4 and the explosion-proof valve 7 before battery assembly.

[0049] The electrolyte injection hole 15 is used to inject electrolyte into the battery, and the sealing component 6 is fixed at the electrolyte injection hole 15 after the electrolyte is injected.

[0050] The electrode core assembly is disposed within the accommodating space of the rectangular frame 1. The electrode core assembly includes an electrode core 3, an insulating film 33 covering the outer surface of the electrode core 3, and a limiting insulating member 5 disposed between the electrode core 3 and the rectangular frame 1. The electrode tab of the electrode core 3 is electrically connected to the electrode post assembly 4.

[0051] Two shell covers 2 are welded to both sides of the rectangular frame 1 to seal the space. The two shell covers 2 are connected to the rectangular frame 1 along both sides of the width direction of the rectangular frame 1, so that a sealed space is formed between the rectangular frame 1 and the shell covers 2.

[0052] The electrolyte is disposed within a sealed space enclosed by the two shell covers 2 and the rectangular frame 1.

[0053] Since the outer periphery of the electrode core 3 cannot meet the accommodating space of the rectangular frame 1, a limiting insulating member 5 is provided between the rectangular frame 1 and the electrode core 3. The limiting insulating member 5 provides insulating support for the electrode core 3, thereby limiting and fixing the electrode core 3 within the rectangular frame 1. This limiting insulating member 5 serves to fix and support the electrode core 3 within the rectangular frame 1, while simultaneously filling the gap between the electrode core 3 and the rectangular frame 1 to prevent contact between the two, thus achieving the purpose of insulation.

[0054] The “X direction” marked in Figure 2 refers to the width direction of the rectangular border 1.

[0055] As shown in Figure 3, the explosion-proof hole 17, the terminal mounting hole 16, and the liquid injection hole 15 are all located on the rectangular frame 1. Therefore, when processing the rectangular frame 1, the terminal assembly 4 can be fixed at the terminal mounting hole 16, the sealing assembly 6 can be fixed at the liquid injection hole 15, and the explosion-proof valve 7 can be fixed at the explosion-proof hole 17 to obtain an integrated cell frame. Then, the terminal assembly and the shell cover 2 are assembled onto the integrated cell frame. By replacing the traditional battery cover structure with the integrated cell frame, an extremely thin battery structure can be obtained in the battery size design. At the same time, all four sides of the rectangular frame 1 can be used to set the components of the original cover structure, which increases the arrangement area of ​​the terminal mounting position, the explosion-proof valve position, and the liquid injection hole position, making the design of each component of the battery more flexible. The processing cost of the integrated cell frame is low and it is suitable for mass production. Compared with assembling each part one by one, the battery in this application has a higher degree of integration, which can improve the battery assembly efficiency.

[0056] The rectangular frame 1 is an integral frame structure surrounding the electrode core assembly. As the main support for the battery, the integral rectangular frame 1 has higher structural strength and better support performance. Moreover, the depth of the accommodating space can be changed by adjusting the width of the rectangular frame 1 to accommodate electrode core assemblies of different thicknesses. This eliminates the need for stamping the battery casing, thereby increasing the size range of the battery casing and enabling the production of thinner casings, which is beneficial for manufacturing ultra-thin batteries.

[0057] In the battery of this application, since the explosion-proof hole 17, the terminal mounting hole 16, and the liquid injection hole 15 are all located on the rectangular frame 1, the terminal assembly 4 can be fixed at the terminal mounting hole 16, the sealing assembly 6 at the liquid injection hole 15, and the explosion-proof valve 7 at the explosion-proof hole 17 during the processing of the rectangular frame 1, thus obtaining an integrated cell frame. Then, the core assembly and the casing 2 are assembled onto the integrated cell frame. By replacing the traditional battery cover structure with an integrated cell frame, an extremely thin battery structure can be achieved during battery size design. Simultaneously, the integrated cell frame has low processing costs and is suitable for mass production. Compared to assembling individual parts one by one, the battery in this application has a higher degree of integration, thereby improving battery assembly efficiency.

[0058] In one embodiment, the thickness of the rectangular frame 1 is 0.8mm to 3.5mm, and the thickness of the cover 2 is 0.1mm to 0.5mm. The rectangular frame 1 with a relatively large frame thickness serves as the main support for the battery casing, while the thinner cover 2 seals the rectangular frame 1 and protects the electrode core assembly. This achieves the protective function of the battery casing, and the combination of the rectangular frame 1 and the thinner cover 2 reduces the overall thickness of the battery, resulting in a higher utilization rate of the battery in the thickness direction, thereby improving the assembly ratio and facilitating the manufacture of ultra-thin batteries.

[0059] In one embodiment, as shown in FIG3, the rectangular frame 1 includes a first frame edge 11, a second frame edge 12, a third frame edge 13 and a fourth frame edge 14. The first frame edge 11 and the second frame edge 12 are arranged opposite each other in the horizontal direction, and the third frame edge 13 and the fourth frame edge 14 are arranged opposite each other in the vertical direction, with the third frame edge 13 located above the fourth frame edge 14.

[0060] The first frame edge 11, the second frame edge 12, the third frame edge 13 and the fourth frame edge 14 connected in sequence enclose the space of the rectangular frame 1. The rectangular frame 1 can be formed by extruding a whole frame, by bending a strip of material and connecting the ends, or by assembling the four frame edges.

[0061] In one embodiment, the electrode mounting hole 16 is located on the first frame edge 11 or the second frame edge 12, the liquid injection hole 15 and the electrode mounting hole 16 are located on the same frame edge, and the explosion-proof hole 17 is located on the first frame edge 11, the second frame edge 12 or the third frame edge 13.

[0062] Since the terminal mounting hole 16 is located on the first frame edge 11 or the second frame edge 12, and the first frame edge 11 and the second frame edge 12 are arranged opposite each other in the horizontal direction, the terminal assembly 4 can avoid the bottom of the battery.

[0063] Furthermore, since there is a gap between the tab side of the electrode core assembly and the rectangular frame 1, when the injection hole 15 and the terminal mounting hole 16 are located on the same frame edge, the electrolyte can be injected into the gap between the electrode core assembly and the rectangular frame 1, which facilitates the injection of electrolyte into the battery.

[0064] Setting the explosion-proof hole 17 away from the fourth frame edge 14 can prevent the explosion-proof valve 7 from being installed at the bottom of the battery and affecting its normal use.

[0065] In one embodiment, as shown in FIG3, there are two pole mounting holes 16, located on the first frame edge 11 and the second frame edge 12 respectively, the liquid injection hole 15 is located on the first frame edge 11, and the explosion-proof hole 17 is located on the third frame edge 13.

[0066] In other embodiments, the pole mounting hole 16 and the liquid injection hole 15 may both be located on the third frame edge 13, and the explosion-proof hole 17 may be located on the first frame edge 11, the second frame edge 12, or the third frame edge 13.

[0067] In one embodiment, as shown in FIG2, the integrated cell frame further includes heat dissipation fins 19 disposed on the outer side of the rectangular frame 1, the heat dissipation fins 19 being arranged at intervals perpendicular to the outer side of the rectangular frame 1. These heat dissipation fins 19 can increase the heat dissipation area of ​​the battery and improve its heat dissipation efficiency.

[0068] When the terminal mounting hole 16 is located on the third frame edge 13, the heat dissipation fins 19 are located on the second frame edge 12 and / or the first frame edge 11, so that the heat dissipation fins 19 avoid the bottom of the rectangular frame 1 and the terminal assembly 4, thereby not affecting the normal use of the battery.

[0069] When the terminal mounting hole 16 is located on the second frame edge 12 or the first frame edge 11, the heat dissipation fins 19 are located on the third frame edge 13, so that the heat dissipation fins 19 avoid the bottom of the rectangular frame 1 and the terminal assembly 4, thus not affecting the normal use of the battery.

[0070] In one embodiment, as shown in Figures 3 and 4, a stepped groove 18 communicating with a receiving space is provided on at least one side of the rectangular frame 1 in its width direction. The cover 2 is disposed within the stepped groove 18 and welded to the rectangular frame 1. During the installation of the cover 2, the stepped groove 18 can be used to position and limit the cover 2, facilitating subsequent welding operations. The stepped groove 18 serves to limit the cover 2 located on the rectangular frame 1, facilitating the relative positioning between the cover 2 and the rectangular frame 1, thereby improving the welding quality between the cover 2 and the rectangular frame 1.

[0071] The stepped groove 18 can be processed by machining, stamping or roll forming.

[0072] In one embodiment, the depth of the stepped groove 18 is the same as the thickness of the cover 2, so that the top surface of the cover 2 is flush with the corresponding side surface of the frame body.

[0073] In one embodiment, as shown in Figures 3, 7, and 8, the pole assembly 4 includes:

[0074] The pole includes a first pole piece 45 and a second pole piece 46 connected in sequence.

[0075] The outer connecting piece 41 is disposed on the outside of the rectangular frame 1 and is fixedly connected to the first pole piece 45 of the pole piece;

[0076] The outer insulating component 44 is disposed outside the pole mounting hole 16, located between the outer connecting piece 41 and the rectangular frame 1;

[0077] The inner insulating member 43 is disposed inside the pole mounting hole 16, between the second pole member 46 and the rectangular frame 1.

[0078] The first sealing ring 42 is sleeved on the first pole piece 45. When the pole piece is fixed with the outer connecting piece 41, the second pole piece 46 abuts the sealing end face of the first sealing ring 42 against the pole mounting hole 16 of the rectangular frame 1.

[0079] Among them, the inner insulating component 43 achieves insulation between the second pole piece 46 and the inner side of the rectangular frame 1, the outer insulating component 44 achieves insulation between the outer connecting piece 41 and the outer side of the rectangular frame 1, and the first sealing ring 42 improves the sealing between the pole mounting hole 16 and the pole.

[0080] The pole assembly 4 is split into multiple parts, so that each part can be assembled separately from the inside and outside of the rectangular frame 1, reducing the assembly restrictions of the pole mounting hole 16 on each part.

[0081] In other embodiments, the pole assembly 4 can be integrally injection molded from the pole, the outer connecting piece 41, and the insulating part.

[0082] In one embodiment, as shown in FIG3, the first pole piece 45 and the second pole piece 46 of the pole piece have a rectangular cross-section, and the pole piece mounting hole 16 is a first waist-shaped hole provided on the rectangular frame 1, and the side of the first waist-shaped hole is at least 2mm away from the side of the rectangular frame 1.

[0083] Since the cover 2 is welded to both sides of the rectangular frame 1, thermal stress will be generated at the edge of the rectangular frame 1 in the width direction when the cover 2 is welded. Therefore, the distance between the pole mounting hole 16 and the edge of the rectangular frame 1 is limited to at least 2mm to avoid the situation of weld burn-through, weld leakage or excessive deformation when the hole is too close to the edge.

[0084] The length of the first oblong hole ranges from 7 to 50 mm, and the cross-sectional area of ​​the first oblong hole is 14 mm².2 ~100mm 2 The cross-sectional area of ​​the first oblong hole is larger than the current-carrying area of ​​the electrode post. The current-carrying area is limited by limiting the cross-sectional area of ​​the first oblong hole. The higher the battery rate, the larger the current-carrying area, and the longer the length of the first oblong hole needs to be designed.

[0085] In one embodiment, as shown in Figures 7 and 8, the pole mounting hole 16 is eccentrically positioned along the width direction of the rectangular frame 1. The distance between the axis of the pole mounting hole 16 and the side of the rectangular frame 1 is 0.2 to 0.4 times the width of the rectangular frame 1, so that the first pole member 45 is positioned upwards. This allows the external connecting piece 41 connected to the first pole member 45 to be positioned upwards, and the external connecting piece 41 can be designed to be larger in size, which is beneficial for the external connecting piece 41 to be electrically connected to the external module.

[0086] The width of the rectangular frame 1 ranges from 8 to 55 mm. The larger the width of the rectangular frame 1, the larger the eccentric distance of the first oblong hole can be designed. Specifically, the width of the rectangular frame 1 is usually 8 to 10 mm. In this case, the axis of the first oblong hole is 1 to 2 mm away from the center of the rectangular frame 1.

[0087] In one embodiment, as shown in Figures 3, 7, and 8, the pole post further includes a third pole post 47 fixedly connected to the second pole post 46. The third pole post 47 and the first pole post 45 are respectively located on both sides of the second pole post 46. The third pole post 47 is welded and fixed to the tab of the pole core 3 in the pole core assembly. The provision of the third pole post 47 increases the length of the pole post, thereby increasing the contact area between the pole post and the tab, so as to facilitate welding the tab and the pole post.

[0088] In one embodiment, as shown in Figures 3 and 8, the first electrode post 45 includes a first segment, a second segment, and a third segment connected in sequence. The first segment of the first electrode post 45 is integrally formed with the third electrode post 47 and the second electrode post 46. The first segment and the second segment of the first electrode post 45 are welded together. The second segment is made of copper, the same material as the first segment, and the third segment is made of aluminum. When the electrode post is a negative electrode post, the first electrode post 45, the second electrode post 46, and the third electrode post 47 are copper-aluminum composite electrode posts.

[0089] Because aluminum has better welding performance and copper has better electrical conductivity, the first pole piece 45 has good welding performance and electrical conductivity when the third section is welded to the tab of the pole core 3 and the first and second sections are used for electrical conduction.

[0090] In other embodiments, the first electrode post 45, the second electrode post 46, and the third electrode post 47 can be integrally formed and are all made of copper. When the electrode post is a positive electrode post, the first electrode post 45, the second electrode post 46, and the third electrode post 47 are integrally formed copper electrode posts.

[0091] In one embodiment, the thickness of the first pole piece 45 is 0.8mm to 3.5mm, and the height of the pole piece mounting hole 16 is greater than the thickness of the first pole piece 45. When the thickness of the first pole piece 45 is 0.8mm to 3.5mm, it is advantageous to process the pole piece mounting hole 16 on a frame edge with limited width. The first pole piece 45 needs to be welded to the outer connecting piece 41, forming two weld seams. When the thickness of the first pole piece 45 is less than 0.8mm, the two weld seams between the first pole piece 45 and the outer connecting piece 41 are prone to interference, affecting the welding quality and hindering the fixed connection between the first pole piece 45 and the outer connecting piece 41. When the thickness of the first pole piece 45 is greater than 3.5mm, the first pole piece 45 occupies too much area of ​​the outer connecting piece 41, which is detrimental to the electrical connection between the outer connecting piece 41 and the outer connecting piece. In this embodiment, the thickness of the first pole piece 45 is 1mm.

[0092] The height of the third electrode post 47 is 4mm to 10mm to balance the welding length between the third electrode post 47 and the tab, as well as the cost of the electrode post. When the height of the third electrode post 47 is less than 4mm, the overlapping area between the third electrode post 47 and the tab of the electrode core is insufficient, which cannot guarantee the welding quality between the tab and the third electrode post 47. When the height of the third electrode post 47 is greater than 10mm, the internal space occupied by the third electrode post 47 is too large, which is not conducive to the utilization rate of the internal space of the battery. In this embodiment, the height of the third electrode post 47 is 6mm.

[0093] In one embodiment, the width of the second pole piece 46 is at least 2 mm greater than the thickness of the first pole piece 45, and a stepped structure is formed between the second pole piece 46 and the first pole piece 45. This stepped structure can limit the insertion depth of the pole piece when it passes through the pole piece mounting hole 16 from the inside to the outside of the rectangular frame 1, which facilitates assembly and positioning.

[0094] In other embodiments, as shown in FIG11, the cross-sections of the first pole post 45 and the second pole post 46 can be circular. The cross-sectional area of ​​the first pole post 45 can be smaller than that of the second pole post 46. The bottom surface of the second pole post 46 can be welded and fixed to the tab of the pole core 3 in the pole core assembly. The first pole post 45 passes through the pole post mounting hole from the inside to the outside of the rectangular frame 1 and is fixed to the outer connecting piece 41. The pole post mounting hole 16 is a first circular hole provided on the rectangular frame 1, and the cross-sectional area of ​​the first circular hole is 20mm². 2 ~60mm 2 .

[0095] At the base magnification, the frame width is 15mm, and the diameter of the first circular hole is 7.5mm.

[0096] At this point, the first circular hole can be centered along the width direction of the rectangular frame 1. The "Y direction" marked in Figure 11 refers to the width direction of the rectangular frame 1.

[0097] In one embodiment, as shown in Figures 3 and 8, the outer connecting piece 41 is provided with a first through hole extending through its thickness direction. The first pole piece 45 passes through the pole mounting hole 16 of the rectangular frame 1 and extends into the first through hole, where it is welded and fixed to the outer connecting piece 41. The first through hole supports and limits the first pole piece 45, facilitating subsequent welding of the first pole piece 45 and the outer connecting piece 41.

[0098] In one embodiment, as shown in Figures 3 and 8, the outer insulating member 44 includes a first substrate, a first limiting ring disposed on one side of the first substrate, a second limiting ring disposed on the other side of the first substrate, and a second through hole penetrating the first substrate.

[0099] The first pole piece 45 extends through the second through hole to the outer connecting piece 41 located inside the first limiting ring, and the second limiting ring is embedded in the pole mounting hole 16 of the rectangular frame 1.

[0100] When installing the pole assembly 4 onto the rectangular frame 1, the second limiting ring is first inserted into the pole mounting hole 16 of the rectangular frame 1 to fix the outer insulating component 44 onto the rectangular frame 1. Then, the outer connecting piece 41 is inserted into the first limiting ring of the outer insulating component 44. Finally, the first pole component 45 is passed through the second through hole and welded to the outer connecting piece 41. In summary, the first limiting ring, the second limiting ring, and the second through hole enable the rectangular frame 1 to support the outer insulating component 44, the outer connecting piece 41, and the pole during assembly, facilitating subsequent welding between the outer insulating component 44, the outer connecting piece 41, and the pole.

[0101] In one embodiment, as shown in Figures 3 and 8, the inner insulating member 43 includes a second substrate, a first groove disposed on one side of the second substrate, and a third through hole penetrating the second substrate. The second pole member 46 is embedded in the first groove and presses the first sealing ring 42 sleeved on the first pole member 45 into the third through hole.

[0102] The outer periphery of the second electrode post 46, which is embedded in the first groove, is wrapped by the inner insulating member 43 to prevent the casing 2 from contacting the second electrode post 46 and conducting electricity when the battery is squeezed, thereby improving the safety of the battery.

[0103] In one embodiment, the explosion-proof hole 17 includes a first mounting hole, a second mounting hole, and a pressure relief hole that are sequentially connected from the outside to the inside along the thickness direction of the frame edge. When the explosion-proof sheet 71 is fixed to the second mounting hole by seam welding, the second mounting hole is two stepped holes with different cross-sections disposed between the first mounting hole and the pressure relief hole, forming a first through hole connected to the first mounting hole and a second through hole connected to the pressure relief hole. The cross-sectional area of ​​the first through hole is larger than that of the second through hole, and the distance between the explosion-proof sheet 71 and the explosion-proof membrane 72 is adjusted by controlling the depth of the first through hole.

[0104] The inner side of the explosion-proof hole 17 is a limiting insulating member 5 that abuts against the inner wall of the rectangular frame 1. The explosion-proof valve 7 needs to have a certain gap with the limiting insulating member 5 so that pressure can be applied to the explosion-proof valve 7 to trigger it. Therefore, in this application, the explosion-proof hole 17 is designed as a first mounting hole, a second mounting hole, and a pressure relief hole that are sequentially connected from the outside to the inside along the thickness direction of the rectangular frame 1, so that the stepped surface between the pressure relief hole and the second mounting hole can support the explosion-proof valve 7, and the pressure inside the battery can be applied to the explosion-proof valve 7 through the pressure relief hole.

[0105] In one embodiment, as shown in Figures 3, 9 and 10, the explosion-proof valve 7 includes an explosion-proof sheet 71 with grooves and an explosion-proof membrane 72. The explosion-proof sheet 71 is welded to a second mounting hole, and the explosion-proof membrane 72 is attached to a first mounting hole.

[0106] A first installation gap, 0.3mm to 1mm, exists between the explosion-proof disc 71 and the explosion-proof membrane 72. This gap is designed to prevent the explosion-proof valve 7 from failing to detonate normally when the battery's internal pressure reaches the preset pressure, as the explosion-proof membrane 72 covers the engravings on the explosion-proof disc 71, thus increasing the detonation pressure. If the first installation gap between the explosion-proof disc 71 and the explosion-proof membrane 72 is less than 0.3mm, the distance between them is too small, making it easy for the membrane 72 to adhere to the disc 71, increasing its detonation pressure and preventing it from meeting design requirements. If the first installation gap is greater than 1mm, the depth of the second installation hole in the explosion-proof hole 17 becomes too large, making it difficult to arrange the explosion-proof disc 71 along the thickness of the rectangular frame 1. Alternatively, the structural strength of the step supporting the explosion-proof disc 71 may not meet the requirements.

[0107] In one embodiment, the second mounting hole is a first stepped hole connecting the first mounting hole and the pressure relief hole, and the edge of the explosion-proof sheet 71 is fixed to the first stepped hole by through welding. When the explosion-proof sheet 71 is fixed to the second mounting hole by through welding, the second mounting hole is a first stepped hole connecting the first stepped hole and the pressure relief hole, wherein one end of the first stepped hole is connected to the first mounting hole and the other end is connected to the pressure relief hole. The gap between the explosion-proof sheet 71 and the explosion-proof membrane 72 is controlled by adjusting the depth of the first stepped hole to ensure that a reasonable first mounting gap is maintained between them.

[0108] In one embodiment, the ratio of the area of ​​the groove to the battery capacity is 0.5–3.5 mm². 2 / Ah. The cross-sectional area of ​​the grooves on the explosion-proof plate 71 is set according to the battery capacity. The larger the battery capacity, the more energy may be released in the event of thermal runaway. Therefore, a larger groove is needed to ensure timely release of internal pressure in dangerous situations and prevent battery explosion. If the ratio of the cross-sectional area of ​​the groove to the battery capacity is less than 0.5 mm... 2 / Ah, which affects the venting speed of the pressure relief hole after the score breaks open; if the ratio of the cross-sectional area of ​​the score to the capacity of the battery is greater than 3.5mm... 2 / Ah, which can easily cause the groove to burst prematurely, meaning the opening pressure of the explosion-proof valve is low, causing the valve to open frequently. This prevents the battery from operating under normal pressure, thus affecting the explosion-proof performance of the valve. Specifically, the ratio of the cross-sectional area of ​​the groove to the battery capacity is 0.5mm². 2 / Ah, 0.8mm 2 / Ah, 1.0mm 2 / Ah, 1.2mm 2 / Ah, 1.5mm 2 / Ah, 2.0mm 2 / Ah, 2.5mm 2 / Ah, 3.0mm 2 / Ah, 3.5mm 2 / Ah or a range of values ​​consisting of any two points. Preferably, the ratio of the area of ​​the notch to the battery capacity is 1.0-1.5 mm². 2 / Ah.

[0109] Specifically, the larger the battery capacity, the larger the area of ​​its notch 71. Therefore, in the battery provided in this application, the cross-sectional area of ​​the notch 71 is 20-400 mm². 2 Specifically, it is 25mm. 2 25.6mm 2 35mm 2 40.96mm 2 45mm 2 274mm 2 314mm2 350mm 2 400mm 2 .

[0110] In other embodiments, the second mounting hole may include a first stepped hole communicating with the first mounting hole and a second stepped hole communicating with the pressure relief hole. The cross-sectional area of ​​the first stepped hole is larger than that of the second stepped hole, and the edge of the explosion-proof sheet 71 is fixed to the second stepped hole by seam welding.

[0111] In other embodiments, the explosion-proof hole 17 can be a blind hole provided on the rectangular frame 1, and the explosion-proof valve 7 can be a groove provided on the blind hole. In this case, the depth of the blind hole is 0.7 to 0.8 times the thickness of the rectangular frame 1.

[0112] In one embodiment, the injection hole 15 is a second circular hole disposed on the rectangular frame 1, and the second circular hole is centrally arranged along the width direction of the rectangular frame 1.

[0113] As shown in Figure 2, the sealing assembly 6 includes a sealing rivet and a second sealing ring sleeved on the sealing rivet. The sealing rivet is riveted into the second circular hole and the second sealing ring abuts against the opening of the second circular hole.

[0114] The second sealing ring is positioned using a stepped circular hole, facilitating its installation. Simultaneously, this increases the contact area between the second sealing ring and the injection hole 15, improving the sealing effect.

[0115] In one embodiment, the second circular hole includes a first stepped circular hole and a second stepped circular hole. The first stepped circular hole is connected to the outer side of the rectangular frame 1, and the second stepped circular hole is connected to the inner side of the rectangular frame 1. A sealing rivet is riveted to the second stepped circular hole, and the second sealing ring is abutted against the first stepped circular hole.

[0116] In one embodiment, the diameter of the second stepped circular hole is 2mm to 5mm. The thickness of the battery is typically 10mm, 15mm, or 20mm. The 2mm to 5mm injection hole 15 can meet the injection requirements while avoiding being too close to the edge of the rectangular frame 1 in the width direction.

[0117] In one embodiment, as shown in Figures 2 and 5, the electrode core 3 has a positive electrode tab 31 and a negative electrode tab 32, and the electrode post assembly 4 is provided in two sets, one set of electrode post assembly 4 is electrically connected to the positive electrode tab 31, and the other set of electrode post assembly 4 is electrically connected to the negative electrode tab 32.

[0118] The positive electrode tab 31 and the negative electrode tab 32 are located on opposite sides of the electrode core 3. The limiting insulation component 5 includes two spacers 52 and two insulating fixing plates 51. The two spacers 52 are respectively disposed on one side of the electrode core 3 with the positive electrode tab 31 or the negative electrode tab 32, and the two insulating fixing plates 51 are respectively disposed on one side of the electrode core 3 without the positive electrode tab 31 or the negative electrode tab 32.

[0119] In other embodiments, the positive electrode tab 31 and the negative electrode tab 32 are located on the same side of the electrode core 3. The limiting insulation member 5 includes a spacer 52 and three insulating fixing plates 51. The spacer 52 is located on the side of the electrode core 3 with the positive electrode tab 31 and the negative electrode tab 32. The three insulating fixing plates 51 are respectively located on the side of the electrode core 3 without the positive electrode tab 31 or the negative electrode tab 32.

[0120] In one embodiment, as shown in Figures 5 and 6, the spacer 52 includes two spaced-apart support portions 522 and a connecting portion 521 disposed between the two support portions 522. The connecting portion 521 is provided with a second gap 528 through which the positive electrode tab 31 or the negative electrode tab 32 can pass. The tab of the electrode core 3 passes through the second gap 528 and is electrically connected to the electrode post assembly 4 so that the spacer 52 supports the tab.

[0121] In one embodiment, the support portion 522 includes a third substrate 523, a plurality of vertical support plates 524 disposed on the third substrate 523, and a side plate 525 disposed on the side of the third substrate 523 to connect the plurality of vertical support plates 524 into one unit. The vertical support plates 524 are provided with air passages 527. The vertical support plates 524 can abut against the inner wall of the rectangular frame 1, and the side plate 525 can support the cover 2.

[0122] The space occupied by the spaced vertical support plates 524 and the air passages 527 on the vertical support plates 524 can reduce the space occupied by them, so that the inside of the cell has a larger space for containing electrolyte, so as to inject more electrolyte and improve energy density.

[0123] In one embodiment, the third substrate 523 of the support portion 522 includes a horizontal support plate and an inclined support plate. The horizontal support plate and the connecting portion 521 are arranged parallel to each other, and the inclined support plate connects the horizontal support plate and the connecting portion 521.

[0124] In one embodiment, a clearance area is formed between the inclined support plate and the connecting portion 521, and an angle of 105° to 125° is formed between the inclined support plate and the connecting portion 521. The inclined support plate is tilted away from the electrode core 3 to avoid the electrode tab.

[0125] In one embodiment, an injection space is formed between two adjacent vertical support plates 524 and side plates 525, which may be connected to the injection hole 15 of the integrated cell frame or a non-injection space that is not connected to the injection hole 15.

[0126] The electrolyte injected through the injection hole 15 first flows into the injection space, then flows to the non-injection space, and finally fills the inside of the battery. This allows the electrolyte to be buffered in the injection space before filling the inside of the battery.

[0127] In one embodiment, the distance between two adjacent vertical support plates 524 in the injection space is 2 to 5 times the diameter of the injection hole 15, so that the volume of the injection space can match the injection volume of the injection hole 15.

[0128] In one embodiment, the distance between two adjacent vertical support plates 524 in the non-injection space is less than the distance between two adjacent vertical support plates 524 in the injection space.

[0129] The volume of the electrolyte injection space is designed to be larger than that of the non-injection space, so that the electrolyte is buffered in the larger injection space before flowing to the smaller non-injection space, forming a step-by-step buffering effect.

[0130] In one embodiment, the connecting portion 521 includes two parallel first partitions and a second partition, with a second gap 528 formed between them. The second gap 528 is formed by assembling the first partitions and the second partition, and does not require stamping or other machining processes to form the second gap 528.

[0131] In one embodiment, the width of the second gap 528 is 0.1 to 0.25 times the width of the connecting portion 521, so as to balance the structural strength and cost of the connecting portion 521 and avoid the second gap 528 occupying too large or too small a proportion of the connecting portion 521 in the width direction.

[0132] In one embodiment, the first partition forms a first chamfer on the side near the second gap 528 that connects to the bottom surface of the first partition, and the second partition forms a second chamfer on the side near the second gap 528 that connects to the bottom surface of the second partition. The first chamfer is larger than the second chamfer to avoid the first partition and the second partition having sharp edges on the side that are close to each other, which could damage the electrode tab when it passes through the second gap 528.

[0133] In one embodiment, the support portion 522 further includes an annular protrusion 526 surrounding the third substrate 523, which is thermally fused to the insulating film 33. Since the insulating film 33 is a roll formed by winding an insulating planar film, similar in shape to the pole core 3, the annular protrusion 526 can fit against the inner wall surface of the insulating film 33 to increase the contact area, facilitating subsequent thermal fusion of the annular protrusion 526 and the insulating film 33.

[0134] In one embodiment, the insulating fixing plate 51 has a first abutting surface that abuts against the rectangular frame 1 and a second abutting surface that abuts against the pole core 3. The first abutting surface is a plane and the second abutting surface is an arc surface that fits against the pole core 3.

[0135] The first contact surface of the flat surface can fully contact the inner wall of the rectangular frame 1, and the second contact surface of the arc surface can fit and contact the pole core 3, so that the insulating fixing plate 51 can be firmly supported between the inner wall of the rectangular frame 1 and the pole core 3, thereby better limiting and fixing the pole core 3.

[0136] In one embodiment, at least one end of the insulating fixing plate 51 is thermally fused to the spacer 52, and the insulating fixing plate 51 is thermally fused to the insulating film 33, so that the insulating fixing plate 51, the spacer 52 and the insulating film 33 are interconnected to form an integral structure that wraps the outer surface of the pole core 3, which helps to ensure the insulation between the pole core 3 and the rectangular frame 1.

[0137] In one embodiment, the area where the sides of the shell cover 2 and the rectangular frame 1 overlap in the thickness direction is the welding area between the shell cover 2 and the integrated battery cell frame.

[0138] The welding area between the shell cover 2 and the integrated cell frame is located on both sides of the rectangular frame 1 in the width direction. There are only two welds, and both are regular flat areas, which are easy to weld.

[0139] In one embodiment, the width of the rectangular border 1 is 8mm to 55mm, and the thickness of the rectangular border 1 is 0.8mm to 3.5mm.

[0140] Since the width of the rectangular frame 1 is less than 8mm, it is impossible to integrate the terminal post assembly 4 on the rectangular frame 1. Furthermore, during the welding of the rectangular frame 1 to the shell cover 2, the thermal stress of welding can easily cause thermal stress deformation of the terminal post or explosion-proof valve 7 installed on the rectangular frame 1. The rectangular frame 1 can be gradually thickened according to the battery capacity; currently, the maximum width achievable is 55mm. Preferred widths of the rectangular frame 1 are 8mm, 10mm, 15mm, and 20mm for batteries. The greater the thickness of the rectangular frame 1, the better the structural strength of the processed rectangular frame 1. Correspondingly, the greater the volume of the enclosed space of the rectangular frame 1, the greater the thickness of the rectangular frame 1 should be. In this embodiment, the width of the rectangular frame 1 is 10mm, and the corresponding thickness of the rectangular frame 1 is 0.8mm.

[0141] In one embodiment, the rectangular frame 1 is integrally extruded. Rounded corners are formed between adjacent edges of the rectangular frame 1. The rounded corners form inner chamfers on the inner side of the rectangular frame 1 and outer chamfers on the outer side. The inner chamfer is larger than the outer chamfer to increase the wall thickness at the rounded corners of the rectangular frame 1, thereby improving the structural strength of the rectangular frame 1. Specifically, the radius of the inner chamfer is ≤6mm, and the radius of the outer chamfer is ≥0.5mm. When the rectangular frame 1 is processed using an integral extrusion process, not only can the heat dissipation fins on the outer side be processed simultaneously, but each chamfer of the rectangular frame 1 can also be thickened simultaneously, thereby enhancing the overall structural strength of the rectangular frame 1 and improving the processing quality of the battery casing.

[0142] In one embodiment, the rectangular frame 1 is formed by bending the profile and welding the ends together. The distance between the welded ends of the profile and the nearest side of the rectangular frame 1 is 1.2-2 times the radius of the bend chamfer of the rectangular frame 1. Specifically, when the bend angle formed by bending the profile is R, the welded end should maintain a distance of 2mm-5mm from the bend chamfer of the rectangular frame 1, approximately 1.2 times the bend angle, to ensure that the welds are separated from each other at the bends, thus avoiding the influence of the thermal stress from the welding at the beginning and end of the welds on the chamfer of the frame. Simultaneously, the welded end should be as close as possible to the bend chamfer. When the distance between the welded end and the rectangular frame 1 is greater than twice the radius of the bend angle, the stress on one side of the rectangular frame 1 gradually increases. If the welded end is located at a stress point that gradually increases, it can easily affect the welding quality or battery quality during long-term battery use. Therefore, when the rectangular frame 1 is formed by bending and welding the profile at both ends, the distance between the welded end and the nearest side of the rectangular frame 1 is 1.2-2 times the radius of the bend chamfer.

[0143] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: An integrated battery cell frame includes a rectangular frame (1) with a accommodating space, a terminal post assembly (4) disposed on the rectangular frame (1), a sealing assembly (6) and an explosion-proof valve (7). The rectangular frame (1) is provided with a terminal post mounting hole (16), a liquid injection hole (15) and an explosion-proof hole (17). The terminal post assembly (4) is fixed at the terminal post mounting hole (16), the sealing assembly (6) is fixed at the liquid injection hole (15), and the explosion-proof valve (7) is fixed at the explosion-proof hole (17). The pole core assembly is disposed within the accommodating space of the rectangular frame (1). The pole core assembly includes a pole core (3), an insulating film (33) covering the outer surface of the pole core (3), and a limiting insulating member (5) disposed between the pole core (3) and the rectangular frame (1). The pole tab of the pole core (3) is electrically connected to the pole post assembly (4). Two shell covers (2) are welded to both sides of the rectangular frame (1) to seal the receiving space; The electrolyte is disposed within a sealed space enclosed by the two shell covers (2) and the rectangular frame (1).

2. The battery according to claim 1, characterized in that, The rectangular frame (1) of the integrated battery cell frame includes a first frame edge (11), a second frame edge (12), a third frame edge (13) and a fourth frame edge (14). The first frame edge (11) and the second frame edge (12) are arranged opposite each other in the horizontal direction, and the third frame edge (13) and the fourth frame edge (14) are arranged opposite each other in the vertical direction, with the third frame edge (13) located above the fourth frame edge (14).

3. A battery according to claim 2, characterized in that, The pole mounting hole (16) and the liquid injection hole (15) are both located on the third frame edge (13), and the explosion-proof hole (17) is located on the first frame edge (11), the second frame edge (12) or the third frame edge (13).

4. A battery according to claim 2, characterized in that, The pole mounting hole (16) is located on the first frame edge (11) or the second frame edge (12), the liquid injection hole (15) and the pole mounting hole (16) are located on the same frame edge, and the explosion-proof hole (17) is located on the first frame edge (11), the second frame edge (12) or the third frame edge (13).

5. A battery according to claim 3 or 4, characterized in that, The integrated battery cell frame also includes heat dissipation fins (19) disposed on the outer side of the rectangular frame (1), and the heat dissipation fins (19) are arranged at intervals perpendicular to the outer side of the rectangular frame (1). When the pole mounting hole (16) is located on the third frame edge (13), the heat dissipation fins (19) are located on the first frame edge (11) and / or the second frame edge (12). When the pole mounting hole (16) is located on the first frame edge (11) or the second frame edge (12), the heat dissipation fins (19) are located on the third frame edge (13).

6. A battery according to claim 1, characterized in that, The pole assembly (4) includes: The pole includes a first pole piece (45) and a second pole piece (46) connected in sequence; An outer connecting piece (41) is disposed on the outside of the rectangular frame (1) and is fixedly connected to the first pole piece (45) of the pole piece; An outer insulating member (44) is disposed on the outside of the pole mounting hole (16) and located between the outer connecting piece (41) and the rectangular frame (1); An inner insulating member (43) is disposed inside the pole mounting hole (16) and located between the second pole member (46) of the pole and the rectangular frame (1); The first sealing ring (42) is sleeved on the first pole piece (45). When the pole piece is fixed with the outer connecting piece (41), the second pole piece (46) abuts the sealing end face of the first sealing ring (42) against the pole mounting hole (16) of the rectangular frame (1).

7. A battery according to claim 6, characterized in that, The pole post also includes a third pole post (47) fixedly connected to the second pole post (46). The third pole post (47) and the first pole post (45) are located on opposite sides of the second pole post (46). The third pole post (47) is welded and fixed to the tab of the pole core (3) in the pole core assembly.

8. A battery according to claim 7, characterized in that, The thickness of the first pole piece (45) is 0.8 mm to 3.5 mm; the height of the third pole piece (47) is 4 mm to 10 mm.

9. A battery according to claim 6, characterized in that, The first pole piece (45) and the second pole piece (46) of the pole post have a circular cross-section. The pole post mounting hole (16) is a first circular hole provided on the rectangular frame (1), and the cross-sectional area of ​​the first circular hole is 20 mm². 2 ~60mm 2 .

10. A battery according to claim 1, characterized in that, The explosion-proof hole (17) is a blind hole provided on the rectangular frame (1), and the explosion-proof valve (7) is a groove provided on the blind hole.

11. A battery according to claim 1, characterized in that, The explosion-proof hole (17) includes a first mounting hole, a second mounting hole, and a pressure relief hole that are connected sequentially from the outside to the inside along the thickness direction of the frame.

12. A battery according to claim 11, characterized in that, The explosion-proof valve (7) includes an explosion-proof sheet (71) with grooves and an explosion-proof membrane (72). The explosion-proof sheet (71) is welded to the second mounting hole, and the explosion-proof membrane (72) is attached to the first mounting hole. There is a first mounting gap between the explosion-proof sheet (71) and the explosion-proof membrane (72), which is 0.3 mm to 1 mm.

13. A battery according to claim 10 or 12, characterized in that, The ratio of the area of ​​the groove to the capacity of the battery is 0.5–3.5 mm. 2 / Ah.

14. A battery according to claim 1, characterized in that, The injection hole (15) is a second circular hole provided on the rectangular frame (1), and the second circular hole is centrally arranged along the width direction of the rectangular frame (1); the sealing assembly (6) includes a sealing rivet and a second sealing ring sleeved on the sealing rivet, the sealing rivet is riveted into the second circular hole, and the second sealing ring abuts against the opening of the second circular hole.

15. A battery according to claim 1, characterized in that, The area where the shell cover (2) and the side of the rectangular frame (1) overlap in the width direction is the welding area between the shell cover (2) and the integrated battery cell frame.

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