Shell structure and battery cell
By setting the resistance and creepage distance between the negative terminal and the casing to be greater than those between the positive terminal and the casing in the cell casing structure, the problems of casing corrosion and leakage and safety risks are solved, thereby improving the safety and stability of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2026-03-06
AI Technical Summary
In the existing battery cell casing structure, the resistance and creepage distance between the positive terminal and the casing are the same as those between the negative terminal and the casing. This results in a reduction in voltage between the negative terminal and the casing, which can easily lead to casing corrosion, leakage, and safety risks.
Design a housing structure such that the resistance and creepage distance between the negative terminal and the housing are greater than those between the positive terminal and the housing. By setting the thickness relationship between the negative terminal sealing ring and the plastic parts, ensure that the voltage between the negative terminal and the housing is higher and reduce the difference in resistance and creepage distance.
It effectively avoids lithium intercalation reaction in the casing, reduces the chance of casing corrosion and leakage, and improves the safety performance of the battery cell.
Smart Images
Figure CN223977981U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a casing structure and a battery cell. Background Technology
[0002] In the design of existing battery cell casing structures, the resistance and creepage distance between the positive terminal and the casing are the same as those between the negative terminal and the casing. Since the presence of metal dust and negative electrode graphite foreign matter cannot be completely avoided during the battery cell manufacturing process, these conductive foreign matter will cause the resistance between the negative terminal and the casing to decrease, resulting in a decrease in the voltage between the negative terminal and the casing, which is lower than the good product voltage. Affected by electrochemical reactions, the casing is prone to corrosion and leakage, which can easily lead to safety risks. Utility Model Content
[0003] In view of the above, it is necessary to propose a casing structure and battery cell to reduce the probability of casing corrosion and leakage, and to reduce safety risks.
[0004] This application provides a housing structure, including a housing, a positive terminal cover assembly, a negative terminal cover assembly, a positive terminal post, and a negative terminal post. The housing has a first end and a second end disposed opposite to each other. The housing has a receiving hole extending along the extension direction of the housing and penetrating the first end and the second end. The positive terminal cover assembly is disposed at the first end and closes one end of the receiving hole. The negative terminal cover assembly is disposed at the second end and closes the other end of the receiving hole. The positive terminal post is disposed at the positive terminal cover assembly and located within the receiving hole. The negative terminal post is disposed at the negative terminal cover assembly and located within the receiving hole. The resistance between the negative terminal post and the housing is greater than the resistance between the positive terminal post and the housing. The creepage distance between the negative terminal post and the housing is greater than the creepage distance between the positive terminal post and the housing.
[0005] In some embodiments, the positive end cap assembly includes a first positive plastic component, a positive conductive component, and a positive sealing ring. The first positive plastic component is disposed on the side of the positive conductive component opposite to the second end. The negative end cap assembly includes a first negative plastic component, a negative conductive component, and a negative sealing ring. The first negative plastic component is disposed on the side of the negative conductive component opposite to the first end. The positive electrode post protrudes with a first insertion portion extending along the extension direction of the housing. The first insertion portion passes through the positive conductive component and the first positive plastic component, and the positive sealing ring is sleeved on the first insertion portion. The negative electrode post protrudes with a second insertion portion extending along the extension direction of the housing. The second insertion portion passes through the negative conductive component and the first negative plastic component, and the negative sealing ring is sleeved on the second insertion portion.
[0006] In some embodiments, the positive electrode sealing ring and the negative electrode sealing ring are respectively provided with a first inner hole and a second inner hole. The maximum width F1 between the second inner hole and the peripheral sidewall of the negative electrode sealing ring and the maximum width Z1 between the first inner hole and the peripheral sidewall of the positive electrode sealing ring satisfy the following relationship: F1>Z1; and / or, the positive electrode sealing ring extends into the first positive electrode plastic component, the negative electrode sealing ring extends into the first negative electrode plastic component, and the thickness F2 of the portion of the first negative electrode plastic component near the negative electrode sealing ring and the... The thickness Z2 of the portion of the first positive electrode plastic component near the positive electrode sealing ring satisfies the following relationship: F2>Z2; and / or, a portion of the positive electrode sealing ring is sandwiched between the positive electrode post and the positive electrode conductive component, a portion of the negative electrode sealing ring is sandwiched between the negative electrode post and the negative electrode conductive component, and the thickness F3 of the portion of the negative electrode sealing ring between the negative electrode post and the negative electrode conductive component and the thickness Z3 of the portion of the positive electrode sealing ring between the positive electrode post and the positive electrode conductive component satisfy the following relationship: F3>Z3.
[0007] In some embodiments, the positive terminal cap assembly further includes a second positive electrode plastic component, which covers one end of the receiving hole. The positive electrode conductive component is disposed between the second positive electrode plastic component and the first positive electrode plastic component. The positive electrode post is disposed on the side of the second positive electrode plastic component facing the second end. The first insertion portion passes through the second positive electrode plastic component and the positive electrode conductive component and extends into the first positive electrode plastic component.
[0008] In some embodiments, there is a gap between the periphery of the positive electrode sealing ring and the second positive electrode plastic component.
[0009] In some embodiments, the positive electrode sealing ring includes a first positive electrode body and a second positive electrode body that are sequentially connected and coaxially arranged along the extension direction of the housing. The diameter of the first positive electrode body is larger than the diameter of the second positive electrode body. The first positive electrode body passes through the second positive electrode plastic component and is clamped between the positive electrode post and the positive electrode conductive component. There is a gap between the periphery of the first positive electrode body and the second positive electrode plastic component. The second positive electrode body passes through the positive electrode conductive component and extends into the first positive electrode plastic component.
[0010] In some embodiments, the positive conductive element has an explosion-proof hole, and the positive end cap assembly further includes an explosion-proof valve, which is disposed on the explosion-proof hole.
[0011] In some embodiments, the negative electrode cap assembly further includes a second negative electrode plastic component, which covers the other end of the receiving hole. The negative electrode conductive component is disposed between the second negative electrode plastic component and the first negative electrode plastic component. The negative electrode post is disposed on the side of the second negative electrode plastic component facing the first end. The second insertion portion passes through the second negative electrode plastic component and the negative electrode conductive component and extends into the first negative electrode plastic component.
[0012] In some embodiments, the periphery of the negative electrode sealing ring abuts and seals against the second negative electrode plastic component.
[0013] In some embodiments, the negative electrode sealing ring includes a first negative electrode ring body, a second negative electrode ring body, and a third negative electrode ring body that are sequentially connected and coaxially arranged along the extension direction of the housing. The diameter of the first negative electrode ring body is larger than the diameter of the second negative electrode ring body, and the diameter of the second negative electrode ring body is larger than the diameter of the third negative electrode ring body. The first negative electrode ring body and the second negative electrode ring body pass through the second negative electrode plastic component and are clamped between the negative electrode post and the negative electrode conductive component. The first negative electrode ring body abuts and seals against the second negative electrode plastic component, and the third negative electrode ring body passes through the negative electrode conductive component and extends into the first negative electrode plastic component.
[0014] The housing structure of this application embodiment sets the resistance and creepage distance between the negative terminal and the housing to be greater than those between the positive terminal and the housing, resulting in a higher voltage between the negative terminal and the housing. Even if the resistance between the negative terminal and the housing is slightly reduced due to conductive foreign matter during the manufacturing process, the voltage between the negative terminal and the housing will still remain in a high range. This effectively avoids lithium intercalation reaction in the housing, thereby reducing the probability of housing corrosion and leakage, and reducing safety risks.
[0015] This application also provides a battery cell, including an electrode core and a housing structure as described above. The electrode core is disposed in the receiving hole, and the positive and negative electrodes of the electrode core are respectively connected to the positive terminal and the negative terminal.
[0016] The battery cell in this application embodiment protects the electrode core by setting the above-mentioned shell structure, thereby reducing the probability of shell corrosion and leakage, and reducing the safety risk of the battery cell. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of the shell structure provided in the embodiments of this application.
[0018] Figure 2 yes Figure 1 The diagram shows an exploded view of the shell structure.
[0019] Figure 3 yes Figure 2 The diagram shows an exploded view of the positive terminal cap assembly, positive terminal post, and positive terminal spacer in the housing structure shown.
[0020] Figure 4 yes Figure 2 The diagram shows an exploded view of the negative terminal cap assembly and the negative terminal post in the housing structure.
[0021] Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the shell structure along the V-V direction.
[0022] Figure 6 yes Figure 5 An enlarged schematic diagram of region A in the middle.
[0023] Figure 7 yes Figure 5 Enlarged schematic diagram of region B in the middle.
[0024] Figure 8 This is an exploded structural diagram of the battery cell provided in an embodiment of this application.
[0025] Explanation of main component symbols
[0026] Cell 1000, housing structure 100, housing 10, first end 11, second end 12, receiving hole 13, positive end cap assembly 20, first positive electrode plastic part 21, first through hole 211, positive electrode conductive part 22, second through hole 221, explosion-proof hole 222, positive electrode sealing ring 23, first positive electrode ring body 231, second positive electrode ring body 232, first inner hole 233, gap 234, second positive electrode plastic part 24, third through hole 241, positive electrode riveting part 25, explosion-proof valve 26, explosion-proof valve film 27, positive electrode top film 28, first clearance hole 281, negative end cap assembly 30, First negative electrode plastic part 31, First through hole 311, Negative electrode conductive part 32, Second through hole 321, Liquid injection hole 322, Negative electrode sealing ring 33, First negative electrode ring body 331, Second negative electrode ring body 332, Third negative electrode ring body 333, Second inner hole 334, Second negative electrode plastic part 34, Third through hole 341, Negative electrode riveting part 35, Plug 36, Negative electrode top film 37, Second clearance hole 371, Positive electrode post 40, First insertion part 41, Negative electrode post 50, Second insertion part 51, Positive electrode spacer 60, Outer insulating film 70, Electrode core 200, Inner insulating film 300. Detailed Implementation
[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0028] In the description of this application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, it should be noted that "a plurality of" means two or more, unless otherwise explicitly specified.
[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0030] The following will describe some embodiments of this application in detail with reference to the accompanying drawings.
[0031] Please see Figure 1 and Figure 8 This application provides a housing structure 100 for housing and protecting the electrode core 200. For ease of understanding, this application uses a neutral shell as an example for illustration. Obviously, this is not a limitation of this application.
[0032] Please refer to the following: Figure 2 In this embodiment, the housing structure 100 includes a housing 10, a positive terminal cover assembly 20, a negative terminal cover assembly 30, a positive terminal post 40, and a negative terminal post 50.
[0033] The housing 10 has a first end 11 and a second end 12 disposed opposite to each other, and the housing 10 has a receiving hole 13 extending along the extending direction of the housing 10 and penetrating the first end 11 and the second end 12.
[0034] The positive end cap assembly 20 is located at the first end 11 and closes one end of the storage hole 13.
[0035] The negative end cap assembly 30 is located at the second end 12 and closes the other end of the storage hole 13.
[0036] The positive terminal 40 is disposed in the positive terminal cap assembly 20 and located within the receiving hole 13. The negative terminal 50 is disposed in the negative terminal cap assembly 30 and located within the receiving hole 13. The resistance between the negative terminal 50 and the housing 10 is greater than the resistance between the positive terminal 40 and the housing 10, and the creepage distance between the negative terminal 50 and the housing 10 is greater than the creepage distance between the positive terminal 40 and the housing 10.
[0037] Specifically, when the electrode core 200 and the housing structure 100 are combined to form the battery cell 1000, the electrode core 200 is housed in the housing hole 13, and the positive and negative electrodes of the electrode core 200 are connected to the positive terminal 40 and the negative terminal 50, respectively.
[0038] Because the resistance and creepage distance between the negative terminal 50 and the housing 10 are greater than those between the positive terminal 40 and the housing 10, the voltage between the negative terminal 50 and the housing 10 is higher. Even if the resistance between the negative terminal 50 and the housing 10 is slightly reduced due to conductive foreign matter during the manufacturing process of the cell 1000, the voltage between the negative terminal 50 and the housing 10 will still remain in a high range. For example, the voltage between the negative terminal 50 and the housing 10 can still be greater than or equal to 1.5V, which can effectively prevent the lithium intercalation reaction of the housing 10, thereby reducing the probability of corrosion and leakage of the housing 10 and reducing safety risks.
[0039] Please refer to the following: Figure 3 and Figure 4 In this embodiment, the positive end cap assembly 20 includes a first positive electrode plastic component 21, a positive electrode conductive component 22, and a positive electrode sealing ring 23. The first positive electrode plastic component 21 is disposed on the side of the positive electrode conductive component 22 opposite to the second end 12. The negative end cap assembly 30 includes a first negative electrode plastic component 31, a negative electrode conductive component 32, and a negative electrode sealing ring 33. The first negative electrode plastic component 31 is disposed on the side of the negative electrode conductive component 32 opposite to the first end 11. Both the positive electrode conductive component 22 and the negative electrode conductive component 32 can be made of aluminum sheet. The positive electrode conductive component 22 acts as a positive current collector, its main function being to collect the current generated by the positive electrode active material of the battery cell 1000 and conduct it to the external circuit, and to act as a carrier for the positive electrode active material, realizing the process of converting chemical energy into electrical energy. The negative electrode conductive component 32 mainly provides an electron channel for the electrochemical reaction, accelerates charge transfer, reduces electrochemical polarization, and improves the charge-discharge coulombic efficiency.
[0040] The positive electrode post 40 has a first insertion portion 41 extending along the extension direction of the housing 10. The first insertion portion 41 passes through the positive electrode conductive element 22 and the first positive electrode plastic element 21, and the positive electrode sealing ring 23 is sleeved on the first insertion portion 41. The negative electrode post 50 has a second insertion portion 51 extending along the extension direction of the housing 10. The second insertion portion 51 passes through the negative electrode conductive element 32 and the first negative electrode plastic element 31, and the negative electrode sealing ring 33 is sleeved on the second insertion portion 51. By providing the positive electrode sealing ring 23 and the negative electrode sealing ring 33, the risk of leakage of the housing structure 100 is reduced.
[0041] Please refer to further details. Figure 5 , Figure 6 and Figure 7 In this embodiment, the positive electrode sealing ring 23 and the negative electrode sealing ring 33 are respectively provided with a first inner hole 233 and a second inner hole 334. The maximum width F1 between the second inner hole 334 and the peripheral sidewall of the negative electrode sealing ring 33 and the maximum width Z1 between the first inner hole 233 and the peripheral sidewall of the positive electrode sealing ring 23 satisfy the following relationship: F1>Z1. And / or, the positive electrode sealing ring 23 extends into the first positive electrode plastic component 21, and the negative electrode sealing ring 33 extends into the first negative electrode plastic component 31. The thickness F2 of the portion of the first negative electrode plastic component 31 near the negative electrode sealing ring 33 and the thickness Z2 of the portion of the first positive electrode plastic component 21 near the positive electrode sealing ring 23 satisfy the following relationship: F2>Z2. And / or, a portion of the positive electrode sealing ring 23 is sandwiched between the positive electrode post 40 and the positive electrode conductive element 22, and a portion of the negative electrode sealing ring 33 is sandwiched between the negative electrode post 50 and the negative electrode conductive element 32. The thickness F3 of the portion of the negative electrode sealing ring 33 between the negative electrode post 50 and the negative electrode conductive element 32 and the thickness Z3 of the portion of the positive electrode sealing ring 23 between the positive electrode post 40 and the positive electrode conductive element 22 satisfy the following relationship: F3>Z3.
[0042] When F1, F2, F3, Z1, Z2 and Z3 satisfy at least one of the above relationships, the resistance and creepage distance between the negative terminal 50 and the housing 10 are greater than the resistance and creepage distance between the positive terminal 40 and the housing 10, thereby reducing the probability of corrosion and leakage of the housing 10 and reducing safety risks.
[0043] Please refer to it again. Figure 2 , Figure 3 and Figure 6In this embodiment, the positive electrode cap assembly 20 further includes a second positive electrode plastic component 24, which covers the end of the receiving hole 13 near the first end 11. A positive electrode conductive component 22 is disposed between the second positive electrode plastic component 24 and the first positive electrode plastic component 21. A positive electrode post 40 is disposed on the side of the second positive electrode plastic component 24 facing the second end 12. A first insertion part 41 passes through the second positive electrode plastic component 24 and the positive electrode conductive component 22 and extends into the first positive electrode plastic component 21. The second positive electrode plastic component 24 can be made of conductive PPS (polyphenylene sulfide) material.
[0044] By setting the second positive electrode plastic part 24, the potential difference between the positive electrode post 40 and the shell 10 can be reduced, which helps to reduce the probability of corrosion of the shell 10.
[0045] In this embodiment, the first positive electrode plastic component 21, the positive electrode conductive component 22 and the second positive electrode plastic component 24 are respectively provided with a first through hole 211, a second through hole 221 and a third through hole 241 that are directly opposite each other. The first insertion part 41 is sequentially inserted through the third through hole 241, the second through hole 221 and the first through hole 211. The diameter of the third through hole 241 is larger than the diameter of the first through hole 211 and the second through hole 221.
[0046] In this embodiment, a gap 234 exists between the periphery of the positive electrode sealing ring 23 and the second positive electrode plastic component 24. By setting the gap 234, the electrolyte can easily penetrate between the positive electrode post 40 and the positive electrode conductive component 22, reducing the resistance between the positive electrode post 40 and the positive electrode conductive component 22. This makes the resistance between the negative electrode post 50 and the housing 10 greater than the resistance between the positive electrode post 40 and the housing 10, thereby improving the voltage stability between the negative electrode post 50 and the housing 10 and reducing the probability of corrosion and leakage of the housing 10.
[0047] In this embodiment, the positive electrode sealing ring 23 includes a first positive electrode ring body 231 and a second positive electrode ring body 232 that are sequentially connected and coaxially arranged along the extension direction of the housing 10. The diameter of the first positive electrode ring body 231 is larger than the diameter of the second positive electrode ring body 232. The first positive electrode ring body 231 passes through the third through hole 241 of the second positive electrode plastic part 24 and is clamped between the positive electrode post 40 and the positive electrode conductive part 22. There is a gap 234 between the periphery of the first positive electrode ring body 231 and the second positive electrode plastic part 24. The second positive electrode ring body 232 passes through the positive electrode conductive part 22 and extends into the first positive electrode plastic part 21.
[0048] By setting the first positive electrode ring 231 to be sandwiched between the positive electrode post 40 and the positive electrode conductive component 22, the positive electrode sealing ring 23 can be effectively prevented from moving axially, thereby improving the sealing effect of the positive electrode sealing ring 23. By setting a gap 234 formed between the periphery of the first positive electrode ring 231 and the second positive electrode plastic component 24, the electrolyte can easily penetrate into the space between the positive electrode post 40 and the positive electrode conductive component 22, and can effectively limit the leakage of electrolyte from the positive electrode conductive component 22. By setting the second positive electrode ring 232 to pass through the positive electrode conductive component 22 and extend into the first positive electrode plastic component 21, the leakage of electrolyte from the positive electrode conductive component 22 and the first positive electrode plastic component 21 can be further limited, thereby further improving the sealing effect of the positive electrode sealing ring 23.
[0049] In this embodiment, Z1 is the width Z1 between the first inner hole 233 and the peripheral sidewall of the first positive electrode body 231, and Z3 is the thickness of the first positive electrode body 231.
[0050] In this embodiment, the positive end cap assembly 20 also includes a positive end riveting member 25, which is used to rivet the first positive end plastic part 21 to the positive end conductive part 22, thereby improving the convenience and stability of assembling the first positive end plastic part 21.
[0051] In this embodiment, the positive electrode conductive element 22 has an explosion-proof hole 222, and the explosion-proof hole 222 and the second through hole 221 are respectively opened at both ends of the positive electrode conductive element 22. The positive electrode end cap assembly 20 also includes an explosion-proof valve 26, which covers the explosion-proof hole 222.
[0052] The explosion-proof hole 222 and the explosion-proof valve 26 provide a safe channel for releasing pressure when the internal pressure of the battery cell 1000 rises abnormally, thereby effectively preventing the battery cell 1000 from exploding due to excessive internal pressure, and thus improving the safety performance of the battery cell 1000.
[0053] In this embodiment, the positive terminal cap assembly 20 also includes an explosion-proof valve film 27, which is applied to the explosion-proof valve 26. The explosion-proof valve film 27 can balance the pressure difference between the inside and outside of the battery cell 1000, preventing excessive internal pressure of the battery cell 1000 due to internal gas accumulation. In addition, the explosion-proof valve film 27 also helps to reduce fogging and condensation inside the battery cell 1000.
[0054] In this embodiment, the housing structure 100 further includes a positive electrode top-mounted film 28, which is attached to the side of the positive electrode conductive component 22 facing away from the second positive electrode plastic component 24. The positive electrode top-mounted film 28 has a plurality of first clearance holes 281 for respectively avoiding the explosion-proof valve 26 and the first positive electrode plastic component 21. The provision of the positive electrode top-mounted film 28 is beneficial to improving the external insulation performance of the battery cell 1000.
[0055] In this embodiment, the housing structure 100 further includes a positive electrode spacer 60, which is located at one end of the receiving hole 13. The electrode core 200 and the second positive electrode plastic component 24 are both connected to the positive electrode spacer 60. The positive electrode spacer 60 facilitates the fixing of the electrode core 200 and reduces friction and collision between the electrode core 200 and the housing 10, thereby reducing the probability of damage to the electrode core 200.
[0056] Please refer to it again. Figure 2 , Figure 4 and Figure 7 In this embodiment, the negative electrode cap assembly 30 further includes a second negative electrode plastic component 34, which covers the other end of the receiving hole 13. A negative electrode conductive component 32 is disposed between the second negative electrode plastic component 34 and the first negative electrode plastic component 31. A negative electrode post 50 is disposed on the side of the second negative electrode plastic component 34 facing the first end 11. A second insertion part 51 passes through the second negative electrode plastic component 34 and the negative electrode conductive component 32 and extends into the first negative electrode plastic component 31. The second negative electrode plastic component 34 can be made of insulating plastic PPS (polyphenylene sulfide).
[0057] By setting the second negative electrode plastic part 34, the electrical insulation performance between the negative electrode post 50 and the shell 10 can be guaranteed, preventing short circuits, which is conducive to improving the stability of the operation of the battery cell 1000 and improving the safety performance of the battery cell 1000.
[0058] In this embodiment, the first negative electrode plastic component 31, the negative electrode conductive component 32 and the second negative electrode plastic component 34 are respectively provided with a first through hole 311, a second through hole 321 and a third through hole 341 that are directly opposite each other. The second insertion part 51 passes through the third through hole 341, the second through hole 321 and the first through hole 311. The diameter of the third through hole 341 is larger than the diameter of the first through hole 311 and the second through hole 321.
[0059] In this embodiment, the periphery of the negative electrode sealing ring 33 abuts and seals against the second negative electrode plastic component 34. Specifically, the periphery of the negative electrode sealing ring 33 abuts and seals against the inner wall of the third through hole 341. This prevents electrolyte leakage into the negative electrode conductive component 32 of the negative electrode post 50, thus avoiding affecting the voltage stability between the negative electrode post 50 and the negative electrode conductive component 32, thereby reducing the probability of corrosion and leakage of the casing 10.
[0060] In this embodiment, the negative electrode sealing ring 33 includes a first negative electrode ring body 331, a second negative electrode ring body 332, and a third negative electrode ring body 333, which are sequentially connected and coaxially arranged along the extension direction of the housing 10. The diameter of the first negative electrode ring body 331 is larger than the diameter of the second negative electrode ring body 332, and the diameter of the second negative electrode ring body 332 is larger than the diameter of the third negative electrode ring body 333. The first negative electrode ring body 331 and the second negative electrode ring body 332 pass through the second negative electrode plastic part 34 and are sandwiched between the negative electrode post 50 and the negative electrode conductive part 32. The first negative electrode ring body 331 abuts and seals with the second negative electrode plastic part 34, and the third negative electrode ring body 333 passes through the negative electrode conductive part 32 and extends into the first negative electrode plastic part 31.
[0061] By setting the first negative electrode ring 331 and the second negative electrode ring 332 to be sandwiched between the positive electrode post 40 and the positive electrode conductive component 22, the negative electrode sealing ring 33 can be effectively prevented from moving axially, thereby improving the sealing effect of the negative electrode sealing ring 33. By setting the first negative electrode ring 331 to abut and seal with the second negative electrode plastic component 34, electrolyte leakage to the negative electrode conductive component 32 of the negative electrode post 50 can be avoided, thereby ensuring the stability of the voltage between the negative electrode post 50 and the negative electrode conductive component 32. By setting the third negative electrode ring 333 to pass through the negative electrode conductive component 32 and extend into the first negative electrode plastic component 31, the sealing effect of the negative electrode sealing ring 33 is further improved.
[0062] In this embodiment, F1 is the width between the second inner hole 334 and the peripheral sidewall of the first negative electrode ring 331, and F3 is the total thickness of the first negative electrode ring 331 and the second negative electrode ring 332.
[0063] In this embodiment, the negative end cap assembly 30 also includes a negative end riveting member 35, which is used to rivet the first negative end plastic part 31 to the negative end conductive part 32, thereby improving the convenience and stability of assembling the first negative end plastic part 31.
[0064] In this embodiment, the negative electrode conductive element 32 has an injection hole 322, and the injection hole 322 and the second through hole 321 are respectively opened at both ends of the negative electrode conductive element 32. The negative electrode cap assembly 30 also includes a plug 36, which is inserted into the injection hole 322. The injection hole 322 facilitates the injection of electrolyte into the housing 10, and the plug 36 helps to reduce the probability of electrolyte leakage from the injection hole 322.
[0065] In this embodiment, the negative terminal cap assembly 30 further includes a negative terminal top film 37, which is applied to the side of the negative terminal conductive component 32 facing away from the second negative terminal plastic component 34. The negative terminal top film 37 has multiple second clearance holes 371 for respectively avoiding the plug 36 and the first negative terminal plastic component 31. The provision of the negative terminal top film 37 is beneficial to improving the external insulation performance of the battery cell 1000.
[0066] Please refer to it again. Figure 2 In this embodiment, the housing structure 100 also includes an outer insulating film 70, which is disposed on the outside of the housing 10 and wraps around the peripheral sidewall of the housing 10, thereby improving the insulation performance of the outside of the battery cell 1000.
[0067] In summary, the housing structure 100 of this application embodiment sets the resistance and creepage distance between the negative terminal 50 and the housing 10 to be greater than those between the positive terminal 40 and the housing 10. As a result, the voltage between the negative terminal 50 and the housing 10 is higher. Even if the resistance between the negative terminal 50 and the housing 10 is slightly reduced due to conductive foreign matter during the manufacturing process of the cell 1000, the voltage between the negative terminal 50 and the housing 10 remains within a high range. This effectively avoids lithium intercalation reaction in the housing 10, thereby reducing the probability of corrosion and leakage of the housing 10 and reducing safety risks.
[0068] Please refer to the following: Figure 8 This application also provides a battery cell 1000, including an electrode core 200 and a housing structure 100 as described above. The electrode core 200 is disposed in a receiving hole 13, and the positive and negative electrodes of the electrode core 200 are respectively connected to the positive terminal 40 and the negative terminal 50.
[0069] The battery cell 1000 of this application embodiment protects the electrode core 200 by setting the above-mentioned housing structure 100, thereby reducing the probability of corrosion and leakage of the housing 10 and reducing the safety risk of the battery cell 1000.
[0070] In this embodiment, the battery cell 1000 also includes an inner insulating film 300, which wraps around the peripheral sidewall of the electrode core 200, thereby improving the insulation performance of the electrode core 200.
[0071] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.
[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.
Claims
1. A housing structure (100) characterized by, The application relates to a battery, which comprises the following components: a shell (10) with oppositely arranged first and second ends (11 and 12), wherein the shell (10) is provided with a receiving hole (13) extending along the extension direction of the shell (10) and penetrating through the first and second ends (11 and 12); a positive electrode end cover assembly (20) arranged at the first end (11) and closing one end of the receiving hole (13); a negative electrode end cover assembly (30) arranged at the second end (12) and closing the other end of the receiving hole (13); a positive electrode column (40) arranged at the positive electrode end cover assembly (20) and located in the receiving hole (13); a negative electrode column (50) arranged at the negative electrode end cover assembly (30) and located in the receiving hole (13), wherein the electrical resistance between the negative electrode column (50) and the shell (10) is greater than the electrical resistance between the positive electrode column (40) and the shell (10), and the creepage distance between the negative electrode column (50) and the shell (10) is greater than the creepage distance between the positive electrode column (40) and the shell (10).
2. The housing structure (100) of claim 1, characterized in that The positive electrode end cover assembly (20) comprises a first positive electrode plastic part (21), a positive electrode conductive part (22) and a positive electrode sealing ring (23), the first positive electrode plastic part (21) is arranged on the side of the positive electrode conductive part (22) away from the second end (12), the negative electrode end cover assembly (30) comprises a first negative electrode plastic part (31), a negative electrode conductive part (32) and a negative electrode sealing ring (33), the first negative electrode plastic part (31) is arranged on the side of the negative electrode conductive part (32) away from the first end (11); the positive electrode column (40) is provided with a first insertion part (41) extending along the extension direction of the shell (10), the first insertion part (41) penetrates through the positive electrode conductive part (22) and the first positive electrode plastic part (21), and the positive electrode sealing ring (23) is sleeved on the first insertion part (41); the negative electrode column (50) is provided with a second insertion part (51) extending along the extension direction of the shell (10), the second insertion part (51) penetrates through the negative electrode conductive part (32) and the first negative electrode plastic part (31), and the negative electrode sealing ring (33) is sleeved on the second insertion part (51).
3. The housing structure (100) of claim 2, characterized in that The positive electrode sealing ring (23) and the negative electrode sealing ring (33) are respectively provided with a first inner hole (233) and a second inner hole (334), the maximum width F1 between the second inner hole (334) and the circumferential side wall of the negative electrode sealing ring (33) and the maximum width Z1 between the first inner hole (233) and the circumferential side wall of the positive electrode sealing ring (23) satisfy the following relationship: F1>Z1; and / or, The positive electrode sealing ring (23) extends into the first positive electrode plastic part (21), the negative electrode sealing ring (33) extends into the first negative electrode plastic part (31), the thickness F2 of the part of the first negative electrode plastic part (31) close to the negative electrode sealing ring (33) and the thickness Z2 of the part of the first positive electrode plastic part (21) close to the positive electrode sealing ring (23) satisfy the following relationship: F2>Z2; and / or, A part of the positive electrode sealing ring (23) is clamped between the positive electrode column (40) and the positive electrode conductive part (22), a part of the negative electrode sealing ring (33) is clamped between the negative electrode column (50) and the negative electrode conductive part (32), the thickness F3 of the part of the negative electrode sealing ring (33) between the negative electrode column (50) and the negative electrode conductive part (32) and the thickness Z3 of the part of the positive electrode sealing ring (23) between the positive electrode column (40) and the positive electrode conductive part (22) satisfy the following relationship: F3>Z3.
4. The housing structure (100) according to claim 2 or 3, characterized in that The positive electrode end cover assembly (20) further comprises a second positive electrode plastic part (24), the second positive electrode plastic part (24) covers one end of the accommodation hole (13), the positive electrode conductive part (22) is arranged between the second positive electrode plastic part (24) and the first positive electrode plastic part (21), the positive electrode column (40) is arranged on the side of the second positive electrode plastic part (24) facing the second end (12), and the first insertion part (41) is arranged through the second positive electrode plastic part (24) and the positive electrode conductive part (22) and extends into the first positive electrode plastic part (21).
5. The housing structure (100) of claim 4, characterized in that The periphery of the positive electrode sealing ring (23) has a gap (234) with the second positive electrode plastic part (24).
6. The housing structure (100) of claim 5, characterized in that The positive electrode sealing ring (23) comprises a first positive electrode ring body (231) and a second positive electrode ring body (232) connected in sequence and arranged coaxially along the extension direction of the shell (10), the diameter of the first positive electrode ring body (231) is greater than the diameter of the second positive electrode ring body (232), the first positive electrode ring body (231) is arranged through the second positive electrode plastic part (24) and clamped between the positive electrode column (40) and the positive electrode conductive part (22), the periphery of the first positive electrode ring body (231) has the gap (234) with the second positive electrode plastic part (24), and the second positive electrode ring body (232) is arranged through the positive electrode conductive part (22) and extends into the first positive electrode plastic part (21).
7. The housing structure (100) according to claim 2 or 3, characterized in that The positive electrode conductive part (22) is provided with an explosion-proof hole (222), and the positive electrode end cover assembly (20) further comprises an explosion-proof valve (26), and the explosion-proof valve (26) covers the explosion-proof hole (222).
8. The housing structure (100) according to claim 2 or 3, characterized in that The negative end cover assembly (30) further comprises a second negative plastic part (34) arranged at the other end of the receiving hole (13), the negative conductive part (32) is arranged between the second negative plastic part (34) and the first negative plastic part (31), the negative post (50) is arranged at the side of the second negative plastic part (34) facing the first end (11), and the second insertion part (51) is arranged through the second negative plastic part (34) and the negative conductive part (32) and extends into the first negative plastic part (31).
9. The housing structure (100) of claim 8, characterized in that The peripheral side of the negative sealing ring (33) is in abutting sealing with the second negative plastic part (34).
10. The housing structure (100) of claim 9, characterized in that The negative sealing ring (33) comprises a first negative ring body (331), a second negative ring body (332) and a third negative ring body (333) connected in sequence and arranged coaxially along the extension direction of the shell (10), the diameter of the first negative ring body (331) is greater than that of the second negative ring body (332), the diameter of the second negative ring body (332) is greater than that of the third negative ring body (333), the first negative ring body (331) and the second negative ring body (332) are arranged through the second negative plastic part (34) and clamped between the negative post (50) and the negative conductive part (32), the first negative ring body (331) is in abutting sealing with the second negative plastic part (34), and the third negative ring body (333) is arranged through the negative conductive part (32) and extends into the first negative plastic part (31).
11. An electric core (1000), characterized by, The battery comprises a pole core (200) and the shell structure (100) as claimed in any one of claims 1 to 10, the pole core (200) is arranged in the receiving hole (13), and the positive pole and the negative pole of the pole core (200) are connected with the positive post (40) and the negative post (50) respectively.