Battery and battery processing technology therefor

Abstract

The present application relates to the technical field of batteries, and in particular to a battery and a battery processing technology. The battery comprises: a case, comprising a cell frame having an accommodating space and two case covers, wherein a pole mounting hole, an electrolyte injection hole, and an explosion-proof valve hole are formed on the cell frame; an electrode core assembly, arranged in the accommodating space of the cell frame, wherein the electrode core assembly comprises an electrode core provided with a positive electrode tab and a negative electrode tab, an insulating film sleeved on the outer side of the electrode core, a spacer ring arranged between the tab side of the electrode core and the cell frame, and two side plates arranged between the opposite side of the electrode core and the cell frame; a pole assembly, arranged at the pole mounting hole, wherein the pole assembly comprises a pole, a first sealing ring sleeved on the pole, an outer insulating member and an inner insulating member which are arranged on the inner and outer sides of the pole mounting hole, and an outer connecting member arranged on the outer insulating member and fixed to the pole by welding; an explosion-proof valve, arranged at the explosion-proof valve hole; and a blocking member, sealing the electrolyte injection hole on the cell frame.

Description

Batteries and their processing technology Technical Field

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

[0002] Existing steel-cased batteries involve mounting the battery core assembly within a steel casing. Specifically, a steel casing to house the battery cell is stamped, and a liquid injection groove and an explosion-proof valve groove are machined onto a metal cover plate. The terminal assembly and the battery core assembly are then assembled together and inserted into the steel casing. The metal cover plate is then welded to the steel casing, and the casing is sealed before liquid injection. This casing structure is fixed, and due to limitations in the stamping process and casing thickness, steel-cased batteries cannot meet the design requirements for different battery sizes, hindering ultra-thin battery manufacturing designs. Furthermore, the stretching deformation of the metal sheet during stamping results in uneven thickness distribution in the casing. Therefore, to ensure the overall structural strength of the casing, ultra-thin metal sheets cannot be used to stamp and manufacture the steel casing.

[0003] Application content

[0004] The technical problem to be solved by this application is: to provide a battery and battery processing technology to address the problem that existing steel-cased batteries cannot meet the design requirements of different battery sizes due to limitations in the processing technology of the casing.

[0005] To address the aforementioned technical problems, one aspect of this application provides a battery, comprising:

[0006] The outer casing includes a cell frame with a receiving space and two casing covers welded to both sides of the cell frame to close the receiving space. The cell frame is provided with a terminal mounting hole, a liquid injection hole and an explosion-proof valve hole.

[0007] The electrode core assembly is disposed within the receiving space of the cell frame. The electrode core assembly includes an electrode core with a positive electrode tab and a negative electrode tab, an insulating film sleeved on the outside of the electrode core, a spacer disposed between the electrode tab side of the electrode core and the cell frame, and two side plates disposed between the opposite side of the electrode core and the cell frame.

[0008] A pole assembly is disposed at the pole mounting hole. The pole assembly includes a pole, a first sealing ring sleeved on the pole, an outer insulating component and an inner insulating component disposed on the inner and outer sides of the pole mounting hole, and an outer connecting component disposed on the outer insulating component and welded and fixed to the pole.

[0009] An explosion-proof valve is provided at the explosion-proof valve hole of the battery cell frame;

[0010] And a sealing element to seal the liquid injection hole of the battery cell frame.

[0011] On the other hand, this application provides a battery processing technology for processing the above-mentioned battery, including the following steps:

[0012] Fabrication of cell frames;

[0013] The electrode assembly is fixed to the cell frame;

[0014] The spacer is fixed to one side of the electrode core with the positive electrode tab and / or the negative electrode tab, and the two side plates are fixed to the two opposite sides of the electrode core respectively to obtain the electrode core assembly.

[0015] The electrode core assembly is fixedly connected to the electrode post assembly on the cell frame;

[0016] The two shell covers are fixed to both sides of the cell frame;

[0017] Liquid injection and formation are carried out through the injection holes on the cell frame;

[0018] The filling hole is sealed with a sealing component to form a battery.

[0019] Optionally, the fabrication of the cell frame includes:

[0020] Extruded hollow rectangular profiles;

[0021] Machining electrode mounting holes and fluid injection holes;

[0022] Machining explosion-proof valve holes;

[0023] The rectangular profile of a preset width is cut laterally to obtain the battery cell frame.

[0024] Optionally, the fabrication of the cell frame includes:

[0025] Preparation of sheet materials;

[0026] The sheet material is cut according to a preset length and a preset width to obtain a strip profile;

[0027] Electrode mounting holes and injection holes are machined on the strip profile;

[0028] Machining explosion-proof valve holes;

[0029] The strip profile is bent into a rectangular frame with the ends connected.

[0030] The ends of the strip profile are welded together to form the battery cell frame.

[0031] Optionally, the machining of the explosion-proof valve hole includes:

[0032] A first stepped hole, a second stepped hole, and a pressure relief hole are sequentially connected along the thickness direction of the rectangular profile or along the thickness direction of the plate, wherein the pressure relief hole is located on the inner side of the cell frame;

[0033] The explosion-proof valve includes an explosion-proof disc and an explosion-proof membrane with grooves.

[0034] The explosion-proof sheet is welded to the second step hole;

[0035] The explosion-proof film is applied to the first step hole;

[0036] Wherein, at least a portion of the projection area of ​​the pressure relief hole on the explosion-proof sheet completely coincides with the etched area on the explosion-proof sheet, and there is a gap between the explosion-proof sheet and the explosion-proof membrane.

[0037] Optionally, the machining of the explosion-proof valve hole includes:

[0038] Blind holes are machined from the outside to the inside of the battery cell frame along the thickness direction of the rectangular profile or along the thickness direction of the plate.

[0039] The explosion-proof valve is formed by machining grooves on the side of the blind hole facing the outside of the cell frame.

[0040] Optionally, machining the electrode mounting hole and the injection hole includes:

[0041] The pole mounting hole and the liquid injection hole are machined along the thickness direction of the rectangular profile or the thickness direction of the plate by means of machining, stamping, cold heading, etc.

[0042] Optionally, fixing the electrode assembly to the cell frame includes:

[0043] The first sealing ring is disposed on the pole post;

[0044] The outer insulating component is inserted into the electrode mounting hole from the outside of the electrode mounting hole of the cell frame;

[0045] The inner insulation member is abutted against the inner wall of the cell frame;

[0046] The electrode post fitted with the first sealing ring is inserted from the side having the inner insulation member toward the side having the outer insulation member, and the electrode post presses the first sealing ring between the inner insulation member and the cell frame;

[0047] The end of the pole with the first sealing ring attached passes through the inner insulating component, the cell frame, and the outer insulating component in sequence, and is then welded and fixed to the outer connector located outside the outer insulating component.

[0048] Optionally, the step of fixing the spacer ring to one side of the electrode core having a positive electrode tab and / or a negative electrode tab, and fixing the two side plates to two opposite sides of the electrode core, results in an electrode core assembly comprising:

[0049] Fix the two side plates to the insulating film;

[0050] An insulating film having the side plate is fitted over the outside of the electrode core;

[0051] Pass the positive and / or negative electrode tabs of the electrode core through the limiting hole of the spacer ring;

[0052] The end of the insulating film is fixed to the spacer ring.

[0053] Optionally, the positive and negative tabs of the electrode core are located on the same side of the electrode core; the number of spacers is one, and they are disposed on the side of the electrode core with the positive and negative tabs.

[0054] Optionally, one end of the insulating film extends to the positive electrode tab and the negative electrode tab and is thermally fused to the spacer ring, and the insulating film is attached to and completely covers the outer surface of the electrode core.

[0055] Optionally, the positive and negative tabs of the electrode core are located on two opposite sides of the electrode core; the number of spacers is two, and they are respectively disposed on the side of the electrode core with the positive tab and the side of the electrode core with the negative tab.

[0056] Optionally, one end of the insulating film extends to the side of the electrode core with the positive electrode tab and is heat-fused to one of the spacers, and the other end of the insulating film extends to the side of the electrode core with the negative electrode tab and is heat-fused to another spacer.

[0057] Optionally, fixing the two shell covers to both sides of the cell frame includes:

[0058] The housing cover is welded to one side of the cell frame along one edge of the housing cover to close one side of the receiving space of the cell frame;

[0059] The other cover is welded to the other side of the cell frame along the edge of the other cover to close the other side of the cell frame's receiving space;

[0060] The edge of the casing is the area where the cell frame overlaps with the casing on its side in the thickness direction.

[0061] Optionally, the sealing of the injection hole by the sealing member includes:

[0062] Place the second sealing ring around the outer periphery of the injection hole;

[0063] The sealing rivet is riveted into the injection hole and pressed onto the second sealing ring.

[0064] In the battery manufacturing process of this application, the terminals of the terminal assembly pass through the terminal mounting holes on the cell frame. The electrode core is fixed in the accommodating space of the cell frame and fixedly connected to the terminal assembly by spacers and two side plates. Two shell covers seal both sides of the accommodating space of the cell frame. An explosion-proof valve is installed in the explosion-proof valve hole of the cell frame, and a sealing member seals the liquid injection hole of the cell frame. Therefore, the cell frame is arranged around the small side of the electrode core. The cell frame is the main supporting body of the shell. The depth of the accommodating space can be changed by adjusting the width of the cell frame to accommodate electrode core assemblies of different thicknesses without stamping the battery shell, thereby increasing the size range of the battery shell and enabling the production of thinner shells and, consequently, thinner batteries. Attached Figure Description

[0065] Figure 1 is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0066] Figure 2 is an exploded view of Figure 1;

[0067] Figure 3 is a flowchart of the processing technology for the battery in Figure 1;

[0068] Figure 4 is a schematic diagram of the structure of step S1 in Figure 3;

[0069] Figure 5 is an enlarged view of part A in Figure 4;

[0070] Figure 6 is a schematic diagram of step S2 in Figure 3;

[0071] Figure 7 is a schematic diagram of step S3 in Figure 3;

[0072] Figure 8 is a cross-sectional view of the assembly prepared in step S5 of Figure 3;

[0073] Figure 9 is an enlarged view of part B in Figure 8;

[0074] Figure 10 is another cross-sectional view of the assembly prepared in step S5 of Figure 3;

[0075] Figure 11 is an enlarged view of part C in Figure 10;

[0076] Figure 12 is a diagram showing the state of the battery processed in Figure 3 during use.

[0077] The reference numerals in the accompanying drawings are as follows:

[0078] 1. Cell 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 valve hole; 18. Step groove; 19. Heat dissipation fins; 2. Shell cover; 3. Electrode core; 31. Positive electrode tab; 32. Negative electrode tab; 33. Insulating film; 4. Terminal assembly; 41. Terminal; 42. First sealing ring; 43. Inner insulation component; 44. Outer insulation component; 45. Outer connector; 5. Spacer ring; 6. Sealing component; 7. Explosion-proof valve; 8. Side plate. Detailed Implementation

[0079] 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.

[0080] As shown in Figures 1 and 2, one embodiment of this application provides a battery, comprising:

[0081] The outer casing includes a cell frame 1 with a housing space and two cover 2 welded to both sides of the cell frame 1 to enclose the housing space. The cell frame 1 is provided with a terminal mounting hole 16, an injection hole 15 and an explosion-proof valve hole 17. The injection hole 15 is used to inject electrolyte into the battery.

[0082] The electrode core assembly is disposed within the receiving space of the cell frame 1. The electrode core assembly includes an electrode core 3 with a positive electrode tab 31 and a negative electrode tab 32, an insulating film 33 sleeved on the outside of the electrode core 3, a spacer 5 disposed between the tab side of the electrode core 3 and the cell frame 1, and two side plates 8 disposed between the electrode core 3 and the cell frame 1.

[0083] As shown in Figure 9, the pole assembly 4 is disposed at the pole mounting hole 16. The pole assembly 4 includes a pole 41, a first sealing ring 42 sleeved on the pole 41, an outer insulating member 44 and an inner insulating member 43 disposed on the inner and outer sides of the pole mounting hole 16, and an outer connecting member 45 disposed on the outer insulating member 44 and welded and fixed to the pole 41.

[0084] An explosion-proof valve 7 is installed at the explosion-proof valve hole 17 of the battery cell frame 1.

[0085] And the sealing component 6, which seals the liquid injection hole 15 of the battery cell frame 1.

[0086] Since the explosion-proof valve hole 17, the liquid injection hole 15, the electrode mounting hole 16, and the electrode mounting hole 16 are located on the frame edge of the cell frame 1, and the two shell covers 2 seal both sides of the accommodating space of the cell frame 1, the cell frame 1 is arranged around the small side of the electrode assembly. The cell frame 1 is the main supporting body of the shell, and the depth of the accommodating space can be changed by adjusting the width of the cell frame 1 to accommodate electrode assemblies of different thicknesses without the need for stamping the battery shell, thereby increasing the size range of the battery shell and enabling the production of thinner shells and thinner batteries. In Figure 2, the "X direction" refers to the width direction of the cell frame 1.

[0087] Since the tabs are in the shape of sheets or columns and have a certain length, they need to be connected to the pole post 41. The side of the pole core 3 with the tabs cannot abut against the inner wall of the cell frame 1. Therefore, a spacer 5 needs to be set between the pole core 3 and the cell frame 1. The spacer 5 limits and fixes the pole core 3 inside the cell frame 1.

[0088] The side plates 8 on the other two opposite sides of the electrode core 3 can insulate and separate the electrode core 3 from the cell frame 1, and can also support the electrode core 3 and limit and fix the electrode core 3 within the cell frame 1.

[0089] In the battery of this application, the spacer 5 and the two side plates 8 limit and fix the electrode core 3 in the accommodating space of the cell frame 1. The two shell covers 2 cover both sides of the accommodating space of the cell frame 1. The explosion-proof valve hole 17, the liquid injection hole 15, the electrode mounting hole 16 and the electrode mounting hole 16 are set on the frame edge of the cell frame 1. Therefore, the cell frame 1 is arranged around the small side of the electrode core 3. The cell frame 1 is the main supporting body of the shell. The depth of the accommodating space can be changed by adjusting the width of the cell frame 1 to accommodate electrode core components of different thicknesses without stamping the battery shell, thereby increasing the size range of the battery shell and thus obtaining a thinner shell, and then processing a thinner battery.

[0090] In one embodiment, as shown in Figures 4 and 12, the cell 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.

[0091] In one embodiment, the cell frame 1 further includes a plurality of spaced heat dissipation fins 19 disposed on the outer sides of the first frame edge 11, the second frame edge 12, and / or the third frame edge 13, the heat dissipation fins 19 being integrally formed with the cell frame 1. The arrangement of the heat dissipation fins 19 can increase the contact area between the battery and the air, thereby improving heat dissipation efficiency.

[0092] In one embodiment, the thickness of the frame edge of the cell frame 1 is 0.8mm to 3.5mm, and the thickness of the shell cover 2 is 0.1mm to 0.5mm. The cell frame 1 with a relatively large frame edge thickness serves as the main support for the battery casing, while the thinner shell cover 2 seals the cell frame 1 and protects the electrode core 3. This achieves the protective function of the battery casing, and the cell frame 1 combined with the thinner shell cover 2 reduces the overall thickness of the battery, which is beneficial for adapting to ultra-thin batteries.

[0093] In one embodiment, the thickness of the frame edge of the cell frame 1 is 1.5 mm, and the thickness of the cover 2 is 0.2 mm.

[0094] In one embodiment, as shown in Figures 4, 5 and 9, a stepped groove 18 is provided on at least one side surface in the thickness direction of the cell frame 1. The stepped groove 18 communicates with the inner hole, and the shell cover 2 is limited and fixed in the stepped groove 18 to facilitate the installation of the shell cover 2.

[0095] 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 cell frame 1.

[0096] In one embodiment, as shown in FIG4, there are two pole mounting holes 16 and two sets of pole assembly 4. The two pole mounting holes 16 are respectively located on the first frame edge 11 and the second frame edge 12. The liquid injection hole 15 is located on the first frame edge 11 or the second frame edge 12 and is located close to the third frame edge 13. The positive electrode tab 31 and the negative electrode tab 32 are located at opposite ends of the pole core assembly.

[0097] Since the terminal mounting hole 16 is located on the first frame edge 11 and the second frame edge 12 respectively, 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.

[0098] Moreover, as shown in Figure 9, since there is a gap between the side of the electrode core 3 with the positive electrode tab 31 and the side with the negative electrode tab 32 and the cell frame 1, when the injection hole 15 and the electrode mounting hole 16 are located on the same frame edge, the electrolyte can be injected into the gap between the electrode core 3 and the cell frame 1, which facilitates the injection of electrolyte into the battery.

[0099] In one embodiment, the injection hole 15 is located on the first frame edge 11.

[0100] In one embodiment, as shown in FIG4, heat dissipation fins 19 are disposed on the third frame edge 13 of the cell frame 1. Since the third frame edge 13 is located above the fourth frame edge 14, the placement of heat dissipation fins 19 on the third frame edge 13 does not affect the normal placement of the battery. These heat dissipation fins 19 can increase the heat dissipation area of ​​the battery and improve its heat dissipation efficiency.

[0101] In one embodiment, the explosion-proof valve hole 17 is located on the first frame edge 11, the second frame edge 12, or the third frame edge 13; and the explosion-proof valve hole 17 is machined along the extending direction of the frame edge where it is located. By setting the explosion-proof valve hole 17 away from the fourth frame edge 14, it is possible to avoid the explosion-proof valve 7 being installed at the bottom of the battery, which would affect the normal use of the explosion-proof valve 7.

[0102] In one embodiment, as shown in FIG2, the explosion-proof valve 7 includes an explosion-proof disc with grooves.

[0103] In other embodiments, the explosion-proof sheet can be welded to the explosion-proof valve hole 17 of the cell frame 1, and the explosion-proof valve 7 also includes an explosion-proof film attached to the explosion-proof valve hole 17.

[0104] In one embodiment, as shown in FIG9, a limiting hole is provided on the spacer 5, and the positive electrode tab 31 or the negative electrode tab 32 passes through the limiting hole on the corresponding end of the spacer 5, and the hole wall of the limiting hole supports the tab.

[0105] In other embodiments, both the positive electrode tab 31 and the negative electrode tab 32 are located on the top side of the electrode core assembly, and both the electrode mounting hole 16 and the electrode mounting hole 12 are located on the third frame edge 13. In this case, the liquid injection hole 15 is located on the third frame edge 13.

[0106] Several spaced heat dissipation fins 19 can be integrally formed on the first frame edge 11 and / or the second frame edge 12 of the cell frame 1.

[0107] Additionally, as shown in Figure 3, one embodiment of this application provides a battery processing technology for processing the aforementioned battery, including:

[0108] S1: As shown in Figure 4, prepare the cell frame 1;

[0109] S2: As shown in Figure 6, fix the pole assembly 4 to the cell frame 1;

[0110] S3: As shown in Figure 7, fix the spacer 5 on one side of the electrode core 3 with the positive electrode tab 31 and / or the negative electrode tab 32, and fix the two side plates 8 on the two opposite sides of the electrode core 3 respectively to obtain the electrode core assembly.

[0111] S4: As shown in Figures 8 and 9, the electrode core assembly is fixedly connected to the electrode post assembly 4 on the cell frame 1, and the spacer 5 and the two side plates 8 limit and fix the electrode core 3 in the cell frame 1.

[0112] S5: As shown in Figures 8 to 11, fix the two shell covers 2 to both sides of the cell frame 1;

[0113] S6: Liquid injection and formation are performed through the injection hole 15 on the cell frame 1;

[0114] S7: As shown in Figures 1 and 2, the sealing component 6 is used to seal the injection hole 15 to form a battery.

[0115] In step S2, the terminal 41 of the terminal assembly 4 passes through the terminal mounting hole 16 to enter the cell frame 1. As shown in Figures 8 and 9, in the subsequent step S4, after the core assembly is placed in the receiving space of the cell frame 1, the positive electrode tab 31 of the core 3 rests on the terminal 41 of one of the terminal assemblies 4, and the negative electrode tab 32 of the core 3 rests on the terminal 41 of the other terminal assembly 4.

[0116] Since the tabs are sheet-like or columnar and have a certain length, they need to be connected to the pole post 41. The side of the pole core 3 with the tabs cannot abut against the inner wall of the cell frame 1. Therefore, a spacer 5 needs to be set between the pole core 3 and the cell frame 1. The spacer 5 limits and fixes the pole core 3 within the cell frame 1. The side plates 8 set on the other two opposite sides of the pole core 3 can insulate and separate the pole core 3 from the cell frame 1, and can also support the pole core 3 and limit and fix it within the cell frame 1.

[0117] In this battery manufacturing process, the terminal post 41 of the terminal post assembly 4 passes through the terminal post mounting hole 16 on the cell frame 1. The electrode core 3 is fixed in the receiving space of the cell frame 1 and fixedly connected to the terminal post assembly 4 by the spacer ring 5 and two side plates 8. Two shell covers 2 cover both sides of the receiving space of the cell frame 1. An explosion-proof valve 7 is installed in the explosion-proof valve hole 17 of the cell frame 1. A sealing member 6 seals the liquid injection hole 15 of the cell frame 1. Therefore, the cell frame 1 is arranged around the small side of the electrode core 3. The cell frame 1 is the main supporting body of the shell. The depth of the receiving space can be changed by adjusting the width of the cell frame 1 to accommodate electrode core assemblies of different thicknesses without stamping the battery shell, thereby increasing the size range of the battery shell and thus obtaining a thinner shell, and consequently, processing a thinner battery.

[0118] In one embodiment, step S1, as shown in FIG4, includes fabricating the cell frame 1, which includes:

[0119] S11: Extruded hollow rectangular profile;

[0120] S12: Machining electrode mounting hole 16 and liquid injection hole 15;

[0121] S13: Machining explosion-proof valve hole 17;

[0122] S14: Cut a rectangular profile of a preset width laterally to obtain the cell frame 1.

[0123] The battery processing technology first extrudes a rectangular profile with the required cross-sectional shape, and then cuts a rectangular profile of a preset width laterally to obtain a cell frame 1 of the required width. This cell frame 1 has a space that runs through the thickness direction of the battery to accommodate the core assembly.

[0124] The cell frame 1 with a complete frame structure obtained by the above method eliminates the need for welding or other methods to connect the frame edges, thus simplifying the manufacturing process. Moreover, the explosion-proof valve hole 17, the liquid injection hole 15, the terminal mounting hole 16, and the terminal mounting hole 16 are all machined on the cell frame 1. Compared to the above holes being machined separately on different parts, this can improve the battery production efficiency.

[0125] Since the cell frame 1 is made by cutting rectangular profiles laterally, there is no need to stamp the battery casing, which simplifies the manufacturing process and reduces the difficulty of processing. At the same time, the width of the cell frame 1 can be adjusted by changing the width of the cut rectangular profiles, resulting in a large range of processing dimensions for the battery casing. This allows for obtaining a thinner battery casing, which is beneficial for manufacturing thinner batteries.

[0126] In other embodiments, step S1, fabricating the cell frame 1 includes:

[0127] S110: Preparation of sheet metal;

[0128] S111: Cut the sheet material according to the preset length and preset width to obtain a strip profile;

[0129] S112: Machining pole mounting holes 16 and injection holes 15 on the strip profile;

[0130] S113: Machining explosion-proof valve hole 17;

[0131] S114: Bending a strip profile into a rectangular frame with the ends joined together;

[0132] S115: The ends of the strip profile are welded together to obtain the cell frame 1.

[0133] The manufacturing process of the battery cell frame 1 involves bending and splicing strip profiles into a rectangular frame of the desired shape. The preparation and bending of the strip profiles are relatively simple and easy to process. Furthermore, compared to machining various holes on the rectangular frame, the strip profiles allow for the machining of the electrode mounting holes 16, injection holes 15, and explosion-proof valve holes 17 before bending into the rectangular frame, making processing convenient. At this point, the welding method used at the joints of the strip profiles can be friction welding, laser welding, or high-frequency welding.

[0134] In one embodiment, step S1 further includes machining a stepped groove 18 on at least one side of the cell frame 1 in the width direction, the stepped groove 18 communicating with the receiving space of the cell frame 1. In the subsequent step S5, the cover 2 is placed in the stepped groove 18, the stepped groove 18 can limit and fix the cover 2. The stepped groove 18 can locate the installation position of the cover 2, improving assembly efficiency.

[0135] In one embodiment, as shown in Figures 10 and 11, step S13 or S113, machining the explosion-proof valve hole 17 includes:

[0136] A first step hole, a second step hole, and a pressure relief hole are sequentially connected along the thickness direction of the rectangular profile or along the thickness direction of the plate. The pressure relief hole is located on the inner side of the cell frame 1.

[0137] The explosion-proof valve 7 includes an explosion-proof disc and an explosion-proof membrane with grooves.

[0138] Weld the explosion-proof sheet to the second step hole;

[0139] Apply the explosion-proof film to the hole in the first step;

[0140] Among them, at least part of the projection area of ​​the pressure relief hole on the explosion-proof sheet completely coincides with the etched area on the explosion-proof sheet, and there is a gap between the explosion-proof sheet and the explosion-proof membrane to avoid the explosion-proof valve failing to detonate normally when the internal pressure of the battery reaches the preset pressure due to the explosion-proof membrane covering the etched area on the explosion-proof sheet, thus preventing the explosion-proof valve from detonating normally.

[0141] The inner side of the explosion-proof valve hole 17 is a side plate 8 that abuts against the inner wall of the cell frame 1. A certain gap must be maintained between the explosion-proof disc and the side plate 8 to allow pressure to be applied to the scored area of ​​the explosion-proof disc to detonate the explosion-proof valve. Therefore, in this application, the explosion-proof valve hole 17 is designed as a series of pressure relief holes, a second stepped hole, and a first stepped hole distributed sequentially from the inner side to the outer side of the cell frame 1. This allows the stepped surface between the pressure relief hole and the second stepped hole to support the explosion-proof disc, and the internal pressure of the battery can be applied to the explosion-proof disc through the pressure relief hole. It should be noted that the number of stepped holes can be adjusted as needed during actual processing, but at least two stepped holes must be provided.

[0142] The explosion-proof valve hole 17 is a through hole structure. The explosion-proof valve hole 17 can be processed together with the liquid injection hole 15 and the pole mounting hole 16 by stamping, machining or other methods.

[0143] In other embodiments, step S13 or S113, machining the explosion-proof valve hole 17 may include:

[0144] Blind holes are machined from the outside to the inside of the battery cell frame 1 along the thickness direction of the rectangular profile or along the thickness direction of the plate.

[0145] Scoring is machined on the side of the blind hole facing the outside of the cell frame 1 to form the explosion-proof valve 7.

[0146] At this point, the explosion-proof valve hole 17 is machined by punching a blind hole, which requires separate machining from through holes such as the injection hole 15 and the pole mounting hole 16.

[0147] In one embodiment, step S12 or S112, machining the electrode mounting hole 16 and the injection hole 15 includes:

[0148] The pole mounting hole 16 and the liquid injection hole 15 are machined along the thickness direction of the rectangular profile or the thickness direction of the plate by means of machining, stamping, cold heading, etc.

[0149] In one embodiment, as shown in FIG6, when the cell frame 1 is processed using an extruded hollow rectangular profile, heat dissipation fins 19 are processed on the frame edge of the rectangular profile where the terminal mounting holes 16 are not processed. The heat dissipation fins 19 are extruded together with the rectangular profile. The provision of heat dissipation fins 19 can increase the contact area between the battery and the outside air, thereby improving the heat dissipation capacity of a single battery.

[0150] Specifically, a rectangular profile and multiple sheets are extruded and integrally formed on the outer surface of the rectangular profile. When the rectangular profile of a preset width is subsequently cut laterally, the sheets of the preset width are also cut laterally to form heat dissipation fins 19 on the battery cell frame 1.

[0151] In one embodiment, step S2, fixing the electrode assembly 4 to the cell frame 1, includes:

[0152] S21: Set the first sealing ring 42 onto the pole post 41;

[0153] S22: Insert the outer insulation component 44 into the electrode mounting hole 16 from the outside of the electrode mounting hole 16 of the cell frame 1;

[0154] S23: The inner insulating member 43 is abutted against the inner wall of the cell frame 1;

[0155] S24: Insert the pole post 41, which is fitted with the first sealing ring 42, from the side with the inner insulating member 43 toward the side with the outer insulating member 44, and the pole post 41 presses the first sealing ring 42 between the inner insulating member 43 and the battery cell frame 1.

[0156] S25: The end of the pole post 41, which is fitted with the first sealing ring 42, passes through the inner insulating part 43, the battery cell frame 1, and the outer insulating part 44 in sequence, and is then welded and fixed to the outer connecting part 45 located outside the outer insulating part 44.

[0157] Among them, the inner insulating component 43 achieves insulation between the pole post 41 and the inner side of the cell frame 1, the outer insulating component 44 achieves insulation between the outer connecting component 45 and the outer side of the cell frame 1, and the first sealing ring 42 can improve the sealing performance at the pole post mounting hole 16.

[0158] The electrode assembly 4 is split into multiple parts, so that each part can be assembled separately from the inside and outside of the cell frame 1, reducing the assembly restrictions of the electrode mounting hole 16 on each part.

[0159] In other embodiments, the pole assembly 4 may include a pole 41 and an external connector 45 that may be integrally injection molded with the insulating component.

[0160] In one embodiment, step S4, as shown in Figures 8 and 9, involves fixing the electrode core assembly to the electrode post assembly 4 on the cell frame 1, including:

[0161] S41: The positive electrode tab 31 of the electrode core assembly is fixedly connected to the electrode post 41 in a set of electrode post assemblies 4. The end of the electrode post 41 located in the cell frame 1 is welded to the positive electrode tab 31.

[0162] S42: The negative electrode tab 32 of the electrode core assembly is fixedly connected to the electrode post 41 in another set of electrode post assemblies 4. The end of the electrode post 41 located in the cell frame 1 is welded to the negative electrode tab 32.

[0163] In one embodiment, in step S3, as shown in Figures 2 and 7, the spacer 5 is fixed to one side of the electrode core 3 having the positive electrode tab 31 and / or the negative electrode tab 32, and the two side plates 8 are respectively fixed to the other two opposite sides of the electrode core 3, so that the electrode core assembly includes:

[0164] S31: Fix the two side plates 8 to the insulating film 33;

[0165] S32: The insulating film 33 with side plate 8 is sleeved on the outside of the pole core 3;

[0166] S33: Pass the positive electrode tab 31 and / or negative electrode tab 32 of the electrode core 3 through the limiting hole of the spacer ring 5;

[0167] S34: Fix the end of the insulating film 33 to the spacer 5.

[0168] The aforementioned insulating film 33 is a roll-shaped structure formed by rolling an insulating planar film, which is similar in shape to the pole core 3.

[0169] In one embodiment, in step S3, the positive electrode tab 31 and the negative electrode tab 32 of the electrode core 3 are located on two opposite sides of the electrode core 3. Two spacers 5 are provided, one on the side of the electrode core 3 with the positive electrode tab 31 and the other on the side of the electrode core 3 with the negative electrode tab 32. The two spacers 5 abut against the electrode core 3 and the cell frame 1 respectively, so that the electrode core 3 remains stationary within the cell frame 1.

[0170] In one embodiment, one end of the insulating film 33 extends to the side of the electrode core 3 with the positive electrode tab 31 and is thermally fixed to a spacer 5, and the other end of the insulating film 33 extends to the side of the electrode core 3 with the negative electrode tab 32 and is thermally fixed to another spacer 5.

[0171] In other embodiments, in step S3, the positive electrode tab 31 and the negative electrode tab 32 of the electrode core 3 are both located on one side of the electrode core 3, and there is one spacer 5, which is disposed on the side of the electrode core 3 with the positive electrode tab 31 and the negative electrode tab 32. At this time, one end of the insulating film 33 can extend to the positive electrode tab 31 and the negative electrode tab 32 and be thermally fused to the spacer 5, and the insulating film 33 is attached to and completely covers the outer side of the electrode core 3.

[0172] In one embodiment, step S5, as shown in Figures 8 and 9, includes fixing the two shell covers 2 to both sides of the cell frame 1, which includes:

[0173] S51: Weld the cover 2 to one side of the cell frame 1 along the edge of the cover 2 to close one side of the receiving space of the cell frame 1.

[0174] S52: Weld the other cover 2 to the other side of the cell frame 1 along the edge of the other cover 2 to close the other side of the cell frame 1's housing space.

[0175] The edge of the cover 2 is the area where the side of the cell frame 1 overlaps with the cover 2 in the thickness direction.

[0176] In one embodiment, step S7, as shown in Figures 1 and 2, involves sealing the injection hole 15 with the sealing member 6, including:

[0177] S71: Place the second sealing ring around the outer periphery of the injection hole 15;

[0178] S72: Rivet the sealing rivet into the injection hole 15 and press it onto the second sealing ring.

[0179] In one embodiment, as shown in Figures 6 and 12, the cell 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.

[0180] In one embodiment, the first frame edge 11, the second frame edge 12, the third frame edge 13 and the fourth frame edge 14 have the same width, defined as frame edge width A, and a chamfer B is formed between adjacent frame edges, with the outer diameter of chamfer B being R.

[0181] In one embodiment, the two pole mounting holes 16 are located at the center of the first frame edge 11 or the second frame edge 12, respectively, and the liquid injection hole 15 is located on the first frame edge 11 or the second frame edge 12 and is set close to the third frame edge 13.

[0182] In one embodiment, as shown in Figures 4 and 9, the pole mounting hole 16 is a first oblong hole provided on the cell frame 1. The first oblong hole is eccentrically arranged in the width direction of the cell frame 1. The eccentric distance of the first oblong hole is 0.1 to 0.4 times the width A of the frame. The first oblong hole is R+1mm away from the edge of the cell frame 1 in the length direction. The first oblong hole is at least 2mm away from the edge of the cell frame 1 in the width direction.

[0183] "The eccentricity of the first waist-shaped hole" refers to the distance between the center of the first waist-shaped hole and the center of the cell frame 1 in the width direction of the cell frame 1.

[0184] The width of the battery cell frame 1 ranges from 8 to 55 mm. The wider the battery cell frame 1, the larger the eccentricity of the first oblong hole can be designed, thus allowing the external connector 45 to be designed to a larger size, facilitating the connection between the external connector 45 and the external module. Specifically, the width of the battery cell frame 1 is usually 8 to 10 mm, in which case the eccentricity of the first oblong hole is 1 to 2 mm.

[0185] The length of the first oblong hole in this application is between 7 and 50 mm, and the cross-sectional area of ​​the first oblong hole is between 14 mm and 100 mm². 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.

[0186] Since the cover 2 is welded to both sides of the cell frame 1, thermal stress will be generated on the edge of the cell frame 1 in the width direction when the cover 2 is welded. Therefore, the distance between the terminal mounting hole 16 and the edge of the cell frame 1 is limited to at least 2.5mm to avoid the situation of weld burn-through, weld leakage or excessive deformation when the hole is too close to the edge.

[0187] In other embodiments, as shown in FIG7, the electrode mounting hole 16 can be a first circular hole provided on the cell frame 1. The first circular hole is centrally arranged in the width direction of the cell frame 1, and the diameter of the first circular hole is 0.3 to 0.7 times the width A of the frame side.

[0188] As shown in Figure 7, at the base magnification, the frame width A is 15mm and the diameter of the first circular hole is 7.5mm.

[0189] In one embodiment, processing the injection hole 15 includes processing a second circular hole and a sealing groove that are sequentially connected along the thickness direction of the rectangular profile or the thickness direction of the strip profile. The second circular hole is located inside the cell frame 1. A second sealing ring is installed in the sealing groove for limiting. The diameter of the second circular hole is 2mm to 5mm, and the distance between the sealing groove and the edge of the cell frame 1 along its length direction is at least 1.5 times the aforementioned R.

[0190] In one embodiment, the diameter of the second circular hole is 3.25 mm, the diameter of the sealing groove is 6 mm, and the depth of the sealing groove is 0.7 mm.

[0191] In one embodiment, as shown in FIG4, the explosion-proof valve hole 17 is a second oblong hole provided on the cell frame 1. The second oblong hole is at least 2 mm away from the edge of the cell frame 1 in the width direction, and the distance between the second oblong hole and the edge of the cell frame 1 in the length direction is at least 1.5 times the aforementioned R.

[0192] Since the cover 2 is welded to both sides of the cell frame 1, thermal stress will be generated on the edge of the cell frame 1 in the width direction when the cover 2 is welded. This limits the distance between the explosion-proof valve hole 17 and the edge of the cell frame 1 to at least 2mm, which can prevent the hole from being too close to the edge, resulting in weld burn-through, weld leakage or excessive deformation.

[0193] In one embodiment, the outer diameter of the chamfer B is R and the inner diameter is r, where R ≥ 0.5 mm and the outer diameter r ≤ 6 mm. The smaller R is, the better, and the larger r is, the better, so that the wall thickness at the chamfer is larger than the wall thickness at the straight section of the frame edge, thereby improving the structural strength of the cell frame 1.

[0194] 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: The outer casing includes a cell frame (1) with a receiving space and two cover (2) welded to both sides of the cell frame (1) to close the receiving space. The cell frame (1) is provided with a terminal mounting hole (16), a liquid injection hole (15) and an explosion-proof valve hole (17). The electrode assembly is disposed within the receiving space of the cell frame (1). The electrode assembly includes an electrode (3) having a positive electrode tab (31) and a negative electrode tab (32), an insulating film (33) sleeved on the outside of the electrode (3), a spacer (5) disposed between the electrode tab side of the electrode (3) and the cell frame (1), and two side plates (8) disposed between the opposite side of the electrode (3) and the cell frame (1). The pole assembly (4) is disposed at the pole mounting hole (16). The pole assembly (4) includes a pole (41), a first sealing ring (42) sleeved on the pole (41), an outer insulating member (44) and an inner insulating member (43) disposed on the inner and outer sides of the pole mounting hole (16), and an outer connecting member (45) disposed on the outer insulating member (44) and welded and fixed to the pole (41). An explosion-proof valve (7) is provided at the explosion-proof valve hole (17) of the battery cell frame (1); And a sealing element (6) to seal the liquid injection hole (15) of the cell frame (1).

2. A battery processing technology for processing the battery as described in claim 1, characterized in that, Includes the following steps: Fabrication of the cell frame (1); The electrode assembly (4) is fixed to the cell frame (1); The spacer (5) is fixed on one side of the pole core (3) having a positive electrode tab (31) and / or a negative electrode tab (32), and the two side plates (8) are fixed on the two opposite sides of the pole core (3) respectively to obtain the pole core assembly; The electrode core assembly is fixedly connected to the electrode post assembly (4) on the cell frame (1); Two shell covers (2) are fixed to both sides of the battery cell frame (1); Liquid injection and formation are performed through the injection hole (15) on the cell frame (1); The sealing element (6) is used to seal the injection hole (15) to form a battery.

3. The battery processing technology according to claim 2, characterized in that, The preparation of the cell frame (1) includes: Extruded hollow rectangular profiles; Machining the electrode mounting hole (16) and the liquid injection hole (15); Machining the explosion-proof valve hole (17); The rectangular profile of a preset width is cut laterally to obtain the battery cell frame (1).

4. The battery processing technology according to claim 2, characterized in that, The preparation of the cell frame (1) includes: Preparation of sheet materials; The sheet material is cut according to a preset length and a preset width to obtain a strip profile; A pole mounting hole (16) and an injection hole (15) are machined on the strip profile; Machining the explosion-proof valve hole (17); The strip profile is bent into a rectangular frame with the ends connected. The ends of the strip profile are welded together to obtain the battery cell frame (1).

5. The battery processing technology according to claim 3 or 4, characterized in that, The processing of the explosion-proof valve hole (17) includes: A first step hole, a second step hole, and a pressure relief hole are sequentially connected along the thickness direction of the rectangular profile or along the thickness direction of the plate, wherein the pressure relief hole is located inside the cell frame (1); The explosion-proof valve (7) includes an explosion-proof disc with grooves and an explosion-proof membrane; The explosion-proof sheet is welded to the second step hole; The explosion-proof film is applied to the first step hole; Wherein, at least a portion of the projection area of ​​the pressure relief hole on the explosion-proof sheet completely coincides with the etched area on the explosion-proof sheet, and there is a gap between the explosion-proof sheet and the explosion-proof membrane.

6. The battery processing technology according to claim 3 or 4, characterized in that, The processing of the explosion-proof valve hole (17) includes: Blind holes are machined from the outside to the inside of the battery cell frame (1) along the thickness direction of the rectangular profile or along the thickness direction of the plate. The explosion-proof valve (7) is formed by machining grooves on the side of the blind hole facing the outside of the cell frame (1).

7. The battery processing technology according to claim 3 or 4, characterized in that, The machining electrode mounting hole (16) and the liquid injection hole (15) include: The pole mounting hole (16) and the liquid injection hole (15) are respectively processed along the thickness direction of the rectangular profile or the thickness direction of the plate by machining, stamping, cold heading or other methods.

8. The battery processing technology according to claim 2, characterized in that, The process of fixing the electrode assembly (4) to the cell frame (1) includes: The first sealing ring (42) is fitted onto the pole post (41); The outer insulating member (44) is inserted into the pole mounting hole (16) of the cell frame (1) from the outside; The inner insulation member (43) is abutted against the inner wall of the cell frame (1); The pole post (41) fitted with the first sealing ring (42) is inserted from the side having the inner insulation member (43) toward the side having the outer insulation member (44), and the pole post (41) presses the first sealing ring (42) between the inner insulation member (43) and the cell frame (1). The end of the pole post (41) fitted with the first sealing ring (42) passes through the inner insulating member (43), the battery cell frame (1), and the outer insulating member (44) in sequence, and is then welded and fixed to the outer connector (45) located outside the outer insulating member (44).

9. The battery processing technology according to claim 2, characterized in that, The spacer (5) is fixed to one side of the electrode core (3) having a positive electrode tab (31) and / or a negative electrode tab (32), and the two side plates (8) are respectively fixed to the two opposite sides of the electrode core (3) to obtain an electrode core assembly comprising: Fix the two side plates (8) to the insulating film (33); An insulating film (33) having the side plate (8) is fitted onto the outside of the pole core (3); Pass the positive electrode tab (31) and / or negative electrode tab (32) of the electrode core (3) through the limiting hole on the spacer (5); The end of the insulating film (33) is fixed to the spacer (5).

10. The battery processing technology according to claim 9, characterized in that, The positive electrode tab (31) and negative electrode tab (32) of the electrode core (3) are both located on the same side of the electrode core (3); the number of spacers (5) is one, and they are disposed on the side of the electrode core (3) with the positive electrode tab (31) and the negative electrode tab (32).

11. The battery processing technology according to claim 10, characterized in that, One end of the insulating film (33) extends to the positive electrode tab (31) and the negative electrode tab (32) and is heat-fused to the spacer (5). The insulating film (33) is attached to and completely covers the outer side of the electrode core (3).

12. The battery processing technology according to claim 9, characterized in that, The positive electrode tab (31) and negative electrode tab (32) of the electrode core (3) are located on two opposite sides of the electrode core (3); there are two spacers (5), which are respectively located on the side of the electrode core (3) with the positive electrode tab (31) and the side of the electrode core (3) with the negative electrode tab (32).

13. The battery processing technology according to claim 12, characterized in that, One end of the insulating film (33) extends to the side of the electrode core (3) with the positive electrode tab (31) and is heat-fused to one of the spacers (5). The other end of the insulating film (33) extends to the side of the electrode core (3) with the negative electrode tab (32) and is heat-fused to another spacer (5).

14. The battery processing technology according to claim 2, characterized in that, The process of fixing the two shell covers (2) to both sides of the cell frame (1) includes: The shell cover (2) is welded to one side of the cell frame (1) along one edge of the shell cover (2) to close one side of the receiving space of the cell frame (1); Weld the other cover (2) along the edge of the other cover (2) to the other side of the cell frame (1) to close the other side of the receiving space of the cell frame (1); The edge of the cover (2) is the area where the cell frame (1) overlaps with the cover (2) on its side in the thickness direction.

15. The battery processing technology according to claim 2, characterized in that, The sealing of the injection hole (15) by the sealing member (6) includes: Place the second sealing ring on the outer periphery of the injection hole (15); The sealing rivet is riveted into the injection hole (15) and pressed onto the second sealing ring.

Images